pc tube overall learninigpc tube overall learninig
The PC tube is a polycarbonate tube. Polycarbonate (referred to as PC) is a polymer containing a carbonate group in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic Kinds of types. Among them, the mechanical properties of aliphatic and aliphatic-aromatic polycarbonates are low, which limits their application in engineering plastics.
Chinese name 2,2-bis (4-hydroxyphenyl) propane polycarbonate Foreign name POLYCARBONATECAS No. 25037-45-0 Melting point 220 ~ 230 ℃ Refractive index n20 / D 1.586
table of Contents
1 Product introduction
3 matters needing attention
4 Market share
5 Major consumer regions
6 Trend analysis
7 Development direction
8 Application areas
9 Synthetic materials
10 backward technology
11 Important breakthrough
PC (Polycarbonate) is the abbreviation of polycarbonate or polycarbonate, or PC engineering plastic for short. PC material 136,21666664 is actually one of the so-called engineering plastics. As a material widely used worldwide, PC has its own characteristics, advantages and disadvantages.
pc tube finished product
pc tube finished product
First of all, PC is an amorphous thermoplastic resin with excellent comprehensive properties. It has excellent electrical insulation, extensibility, dimensional stability and chemical resistance, high strength, heat resistance of 160 degrees and cold resistance- 60 degrees; also has the advantages of self-extinguishing from fire, flame retardant, non-toxic, colorable and so on. You can see the shadow of PC plastic in every corner of your life, and the large-scale industrial production and easy processing characteristics also make it extremely cheap. Its strength can meet various needs from mobile phones to bullet-proof glass. The disadvantage is that it has insufficient hardness compared to metal, which leads to its appearance being more easily scratched, but its strength and toughness are very good, whether it is heavy or ordinary As long as you are not trying to stone it, it will be long enough. Up to 600 mm in diameter, plus anti-acid agent
The meaning of building materials PC materials in the construction industry mainly have two meanings, both of which are English abbreviations:
Add pc tube pictures, convenient for netizens to query
Add pc tube pictures, convenient for netizens to query
One is Prefabricated Concrete or Precast Concrete, which refers to precast concrete parts, or precast concrete construction methods, precast concrete structural forms, etc.
pc tube products 1
pc tube products 1
The second is Prestressed concrete, which refers to prestressed concrete, or
Various specifications of color PC tube chart
Various specifications of color PC tube chart
Prestressed materials, prestressed construction methods, etc.
Both are called PCs, and they are closely connected with concrete, which is very easy to confuse. When you come into contact with this word, you need to carefully analyze the occasions that appear and find out what the other party wants to say. It is best to add Chinese instructions when you use it, so as not to misunderstand the other party.
Two-color PC tube
Two-color PC tube
The PC tube (Polycarbonate Tube) is a transliteration of polycarbonate plastic tubes, the general term for polycarbonate tubes. It has the characteristics of high transparency and light transmittance of 92%, and has the reputation of "plastic crystal". And has excellent weather resistance, especially for outdoor use, ranking other plastic crowns, and has the advantages of good surface hardness and gloss, processing plasticity and other advantages, can be made into various shapes and products.
Polycarbonate (PC) is a colorless and transparent amorphous thermoplastic material. Its name comes from its internal CO3 group.
pc tube products 2
pc tube products 2
Polycarbonate is colorless and transparent, heat-resistant, impact-resistant, flame retardant BI grade, and has good mechanical properties in ordinary use temperature. Compared with the performance close to polymethyl methacrylate, polycarbonate has good impact resistance, high refractive index, and good processing performance. It needs to add a resist to meet UL94 V-0 level. However, polymethyl methacrylate is cheaper than polycarbonate, and large-scale devices can be produced by bulk polymerization. With the increasing scale of polycarbonate production, the price difference between polycarbonate and polymethyl methacrylate is shrinking.
No long-term contact with hot water above 60 ° C. Polycarbonate will emit pyrolysis gas when burning, and the plastic will scorch and foam, but it will not extinguish. It will extinguish from the source of the fire and emit a rare thin phenol smell. Dark black, softens when the temperature reaches 140 ℃, melts at 220 ℃, and can absorb infrared spectrum.
Polycarbonate has poor wear resistance. Some polycarbonate devices used for wear-resistant applications require special surface treatment. Density: 1.20－1.22 g / cm Linear expansion rate: 3.8 × 10 cm / cm ° C Heat distortion temperature: 130 ° C. Not resistant to strong acids and alkalis. Polycarbonate is acid and oil resistant. Polycarbonate is not resistant to ultraviolet light and strong alkalis. Polycarbonate has poor wear resistance. Some polycarbonate devices used for wear-resistant applications require special surface treatment.
2,2-bis (4-hydroxyphenyl) propane polycarbonate Basic information
2,2-bis (4-hydroxyphenyl) propane polycarbonate
POLY (BISPHENOL A CARBONATE)
CARBONATE RESIN; CARBONATE (POLY) RESIN; POLY (BISPHENOL A CARBONATE); POLYCARBONATE 195'000; POLYCARBONATE; POLYCARBONATE RESIN; POLYCARBONATE 6'800; POLYCARBONATE 50'000
Polymers; esters; Carbonates; Hydrophobic Polymers; Polymer Science; Alphabetic; Organic Soluble Alphabetic; Polymer Standards; Polymer Standards Kits; P; POLB-POLYMaterials Science; Polymer Molecular Weight Standards; Reference / Calibration Standards; photosensitive functional polymer materials; polymers Material; plastic disc
2,2-bis (4-hydroxyphenyl) propane polycarbonate Properties
220 ~ 230 ℃
1.2 g / mL at 25 ° C (lit.)
n20 / D 1.586
chlorinated solvents: soluble
Non-toxic, odorless, colorless to pale yellow transparent solid. Soluble in methylene chloride and p-dioxane, slightly soluble in aromatic hydrocarbons and ketones.
Used for making shirts, bedding, table cloths, work clothes cloth, etc.
Used for optical disc substrate materials.
Used as electronic and electrical parts, mechanical textile industry parts, building structural parts, aviation transparent materials and parts, foam structural materials, etc.
There are two methods for the synthesis of polycarbonate, one is the phosgene method, and the other is the transesterification method.
Phosgene method: Phosgene method is also called solvent method and interface polycondensation method. It is a polycarbonate produced by the interfacial polycondensation reaction of bisphenol A sodium salt and phosgene at normal temperature and pressure. The phosgene production process is mainly divided into the following steps:
Phosgenation. Add the prepared sodium salt of bisphenol to the phosgenation kettle, and then add dichloromethane to the phosgenation kettle, and start stirring. When the temperature in the kettle drops to 20 ℃, the phosgene is passed through at a constant speed to carry out the phosgenation reaction. . When the pH value of the reaction medium is 7-8, the phosgene is stopped, and the phosgenation reaction is ended.
Polycondensation. Add phosgene, 25% lye, catalyst, trimethylbenzyl ammonium chloride, molecular weight regulator phenol, etc. into the reactor, and under stirring, continue the reaction at 25-30 ° C for 3-4h. The reaction is Exothermic reactions should be cooled with cold water. When the reaction is terminated, the upper layer of alkaline salt solution is removed by standing, and then neutralized by adding 5% formic acid until the material is slightly acidic. The upper layer of acidic aqueous phase is separated. After neutralization, the reaction solution is post-treated.
Post-processing. The post-treatment is to remove the salt in the resin on the one hand, and to remove the low-molecular substances and unreacted bisphenol A in the resin on the other hand. To remove the salt, the water washing method is generally used, that is, the neutralized resin solution is added with water and stirred to wash off the salt in the resin until the washing water does not contain chloride ions. Precipitation method is generally used for low molecular weight materials. That is, the resin solution after being washed with water is added with a precipitating agent to cause the polycarbonate to precipitate as powder or granules. As the precipitating agent, alcohols, ketones, petroleum ether, toluene or xylene can be used. The conversion efficiency of the phosgene method is high, generally more than 90%, and the relative molecular mass can be as high as (15-20) × 10, but the molecular mass is too high, and molding is difficult. Therefore, molecular weight regulators are commonly used to control molecular weight below 10.
Transesterification method: Transesterification method is also called melt polycondensation method. No solvent is used during polymerization, no equipment for recovering solvent is needed. The product can be directly pelletized, but the reaction time is longer and it needs to be carried out under high vacuum and high temperature . Due to the high viscosity of the reaction materials, it is difficult to heat exchange and uniformly mix the materials during the reaction, making it difficult to obtain high molecular weight products. The transesterification method is carried out in the presence of a basic catalyst, bisphenol A and diphenyl carbonate under high temperature and high vacuum and melting conditions.
Take bisphenol A: diphenyl carbonate = 1: (1.05-1.1), the reaction temperature is high, the transesterification reaction speed is fast, but the decomposition of bisphenol A is more than 180 ℃, so the initial transesterification reaction can only be 180 ℃ Upper temperature limit.
The catalysts for transesterification include sodium benzoate, lithium acetate, chromium acetate, cobalt acetate and potassium hydride. Its dosage is 0.0025% of bisphenol A.
There are three steps in the transesterification process:
Transesterification After the bisphenol A and diphenyl carbonate are added to the transesterification tank and melted, the catalyst is added, and under the vacuum of 6650 Pa, transesterification at about 175 ° C is the first-stage reaction. When a large amount of phenol is distilled off in the reaction system, the temperature is raised to 200-230 ° C, and the by-product phenol is continuously distilled off under a vacuum of 1330-5320 Pa. When the distilled amount is 80% -90% of the theoretical amount, the transesterification ends. The reactant was pressed into the polycondensation kettle with chlorine gas.
Polycondensation reaction The reactant after transesterification is stirred and vacuumed (133Pa), the temperature in the kettle is controlled to 295-300 ℃ for polycondensation reaction, phenol and diphenyl carbonate are removed, as the reaction proceeds, the product melt viscosity rises High, the molecular weight increases until the desired index.
After the post-treatment polycondensation reaction is completed, it is heated at 300 ° C for 2-5h in an inert gas, and the molten material is discharged to soak the pellets with a 10% hydrochloric acid solution to remove the alkali metal ions of the alkaline catalyst, and then washed with deionized water until the pH is equal 7. Pack after drying.
Polycarbonate can be injection molded, extruded, molded, blow molded, thermoformed, printed, bonded, coated and machined. The most important processing method is injection molding.
Before molding, it must be pre-dried, and the moisture content should be less than 0.02%.
pc tube products 3
pc tube products 3
The product produces white turbid color, silver wire and bubbles, PC has a considerable ability to force high elastic deformation at room temperature.
The impact toughness is high, so cold forming, cold drawing, cold rolling and other cold forming processes can be performed. The molecular weight of the PC for extrusion should be greater than 30,000, and a gradient compression screw should be used.
Length to diameter ratio 1: 18 ~ 24, compression ratio 1: 2.5, extrusion blow molding, injection-blowing, injection-pull-blowing method can be used to form high-quality, highly transparent bottles. There are many types of PC alloys, which improve the defects of PC melt viscosity (processability) and products easy to stress cracking.
PC forms alloys or blends with different polymers to improve material properties.
Specifically, there are PC / ABS alloy, PC / ASA alloy, PC / PBT alloy, PC / PET alloy, PC / PET / elastomer blend, PC / MBS blend, PC / PTFE alloy, PC / PA alloy and so on.
There are two material performance advantages and lower costs. For example, in PC / ABS alloys, PC mainly contributes to high heat resistance, better toughness and impact strength, high strength and flame resistance, and ABS can improve formability. Apparent quality, lower density.
Polycarbonate In the dull world plastic raw material market, the market demand for polycarbonate has been growing steadily and showing strong performance, becoming one of the few market highlights. The annual demand of the world polycarbonate market is about 1.2 million tons. In the European market, polycarbonate
pc tube products 4
pc tube products 4
Of sales volume has exceeded the predicted value, and the shortage of market supply has occurred from time to time. According to the information feedback from General Electric Company (GE), the world's largest polycarbonate manufacturer, the demand for polycarbonate in all market applications has rebounded, and GE's output has increased by more than 10%. According to industry estimates, the average annual growth rate of world polycarbonate demand is 8% to 10%. The production development of the world polycarbonate industry mainly presents the following characteristics.
While the market demand is rapidly increasing, several major polycarbonate manufacturers in the world have announced plans to expand production capacity and build new devices. (Analyze the real purpose of mainstream funds and find the best profit opportunity!)
Market share editor
In addition to continuing to increase production on existing production facilities, GE, which has a 45% market share in the world ’s polycarbonate market, announced in July 1998 that it would start construction of a 130,000 t / a polycarbonate production facility in Spain The investment of 700 million US dollars) increased to 150,000 t / a. The first phase of the project is scheduled to be put into operation in early 1999, and the expansion of the second phase of the project is planned to be completed in 2002. Immediately after Bayer, which has a 25% market share in the world's polycarbonate market, announced that it will increase its production capacity by 20% to 30%, and before that, Bayer has built two new production facilities of 50,000 t / a. Several other world polycarbonate manufacturers such as DOW Chemical Company and Japan's Tei-jin Company are also expanding their production capacity.
Even in Southeast Asia, despite the financial crisis, the construction of new polycarbonate production facilities in Taiwan, Thailand, and Singapore is still on schedule. For example, Thai Polycarbonate ’s 50,000 t / a polycarbonate plant will be put into production. The company is building a 40,000 t / a polycarbonate and a PC / ABS production plant in Thailand. These two plants are expected to be put into production in 2000. DOW Chemical Co., Ltd. and South Korean LG Chemical Co., Ltd. will jointly establish a polycarbonate production enterprise, and build a new polycarbonate production facility of 130,000 t / a.
The new trends of various manufacturers competing to build new devices all over the world have once again attracted the attention of people in the plastics industry in the world. Some people in the industry are worried that although the growth of the Asian polycarbonate market demand has not been affected by the economic slowdown in Southeast Asia, the growth rate of its market demand can still be maintained at double digits.Continue to maintain this high-speed growth trend, then the world polycarbonate industry may face a market situation where output exceeds demand.
Major consumer regions
Japan ’s annual growth rate of market consumption exceeds that of the United States, ranking first in the world, mainly due to the recovery of its economic development. In 1997, the consumption of the European polycarbonate market also exceeded that of the United States, and the growth rate was staggering.
According to the two major varieties of PC resins, the market consumption of polycarbonate in Europe increased by 8.6% and PC / ABS blends increased by 7.6% in 1997. The largest increase in market demand was in the fields of packaging, lighting, transportation and window glass.
Although the growth of the US polycarbonate market in 1997 was generally inferior to the European market, the PC / ABS blend market consumption growth rate in the United States in 1997 exceeded that of Europe, reaching 11.4%. Its polycarbonate market Demand increased by 4.4%. in
pc tube products 5
pc tube products 5
Another fast-growing Brazilian market, the application of polycarbonate constitutes: 32% in the automotive sector, 24% in the optical disc, 16% in the large mineral water bottle, 15% in the electrical field, and 11% in the baby bottle , The remaining 2% is used for building boards.
Although the application of European polycarbonate still focuses on the field of electrical appliances, the application of window glass has become another consumer focus in the market. The consumption of polycarbonate in the United States is still mainly in the window glass and automobile fields. In 1997, the market composition of polycarbonate in Japan did not change much. Electronics and electrical appliances were still the main application areas, followed by automobiles, sheets and films.
Trend analysis editing
According to the analysis of the growth trend of the world market demand, in the future, the DVD disc in the optical disc field and the automotive field will become the most potential application market for polycarbonate, such as PC / ABS blending for car bumpers and other components during the past 3 years The market ’s average annual growth rate has been above 10%, but in terms of the actual application of polycarbonate in these two markets, there are still some technical problems that affect the market ’s development and application, such as the ratio of new DVD discs to CD discs. Its thickness will be reduced to 0.6mm, but the processing flow properties of the existing polycarbonate, when used in molding and manufacturing DVD discs, it is difficult to achieve satisfactory results.
The world's polycarbonate manufacturers have started to optimize the grade of polycarbonate, and began to develop ultra-purity, high-flow polycarbonate for DVD discs. For example, GE has developed on the basis of the existing Lexan-OQ1020C brand. The Lexan-OQ1030L brand was released, which improved the flow performance by 10%. New materials developed by Dow Chemical Company's Cali-brel080 and 1090DVD special materials, Bayer's Marolon DPT-1265 brand and Tejin's Panlite AD5503S brand with higher purity.
In addition, in the application of automotive glass and window glass, although the impact resistance of polycarbonate is higher than that of organic glass (polymethyl methacrylate, PMMA), polystyrene, polyvinyl chloride and other transparent plates, there are still applications Weaknesses: In order to improve the scratch resistance and wear resistance of polycarbonate, polycarbonate must be coated. For this, GE, Bayer, and CFI have developed silicone hard coating technology. Japan's Mitsubishi Engineering Plastics Co., Ltd. and Mitsubishi Gas Chemical Co., Ltd. jointly developed another technology "Coated Film Insertion Injection" system, which is to combine a hard-coated polycarbonate sheet with polycarbonate. Once polycarbonate glass is widely used in the automotive industry, not only can the weight of each car be reduced by 40%, but this application field will form a huge consumer market with annual sales of 5 billion to 6 billion US dollars, and the market prospect is extremely broad.
The application development of polycarbonate is to develop in the direction of high compounding, high function, specialization and serialization. It has launched special grades for various products such as optical discs, automobiles, office equipment, cabinets, packaging, medicine, lighting, and films. Grade.
Building materials industry
Polycarbonate sheet has good light transmittance, impact resistance, UV radiation resistance and dimensional stability of its products and good molding processability, which makes it have obvious technical performance advantages over inorganic glass traditionally used in the construction industry. China has more than 20 production lines for polycarbonate building material hollow panels, with an annual consumption of about 70,000 tons of polycarbonate, which is expected to reach 140,000 tons by 2005.
Polycarbonate has good impact resistance, thermal distortion resistance, good weather resistance and high hardness, so it is suitable for the production of various parts of cars and light trucks, which are mainly concentrated in lighting systems, instrument panels, heating plates, and Frost and polycarbonate alloy bumpers. According to data from developed countries, the proportion of polycarbonate used in the electrical, electronic, and automobile manufacturing industries is between 40% and 50%. China ’s use in this field accounts for only about 10%. The electrical, electrical, and automotive manufacturing industries are the backbone of China ’s rapid development Industry, the future demand for polycarbonate in these areas will be huge. It is estimated that the total number of cars in China will reach more than 3 million in 2005, and the demand will also reach 30,000 tons, so the application of polycarbonate in this field has great potential for expansion.
Production of medical devices
Because polycarbonate products can withstand steam, cleaning agents, heating and large doses of radiation disinfection, without yellowing and physical performance degradation, they are widely used in artificial kidney hemodialysis equipment and other operations that require transparent and intuitive conditions and In medical equipment that needs repeated disinfection. Such as the production of high-pressure syringes, surgical masks, disposable dental appliances, blood separators, etc.
With the rapid development of aviation and aerospace technology, the requirements for various components in aircraft and spacecraft continue to increase, making PC applications in this field also increasing. According to statistics, only 2500 polycarbonate parts are used in a Boeing aircraft, and the consumption of polycarbonate in a single plane is about 2 tons. On the spacecraft, hundreds of different configurations of polycarbonate components reinforced with glass fiber and astronaut protective equipment are used.
The new growth point in the packaging field is the various types of water storage bottles that can be repeatedly sterilized and used. Because polycarbonate products have the advantages of light weight, good impact resistance and transparency, they are not deformed and remain transparent when washed with hot water and corrosive solutions, and PC bottles have completely replaced glass bottles in some fields. It is predicted that as people pay more attention to the quality of drinking water, the growth rate of polycarbonate in this area will remain at more than 10%, and it is expected to reach 60,000 tons by 2005.
Electronic and electrical field
Since polycarbonate has good and constant electrical insulation in a wide temperature and humidity range, it is an excellent insulating material. At the same time, its good flame retardancy and dimensional stability make it form a broad application field in the electronic and electrical industry. Polycarbonate resin is mainly used in the production of various food processing machinery, power tool housings, body, brackets, refrigerator freezer drawers and vacuum cleaner parts. And for the important parts of computers, video recorders and color TVs that require high parts accuracy, polycarbonate materials also show extremely high use value.
PC tube display
PC tube display (17 photos)
Optical lens field
Polycarbonate occupies an extremely important position in this field due to its unique characteristics of high light transmittance, high refractive index, high impact resistance, dimensional stability and easy processing and molding. The optical lens made of optical grade polycarbonate can be used not only for cameras, microscopes, telescopes and optical testing instruments, but also for film projector lenses, copier lenses, infrared autofocus projector lenses, laser beam printer lenses, and various Various prisms, polygon mirrors, and many other office equipment and household appliances fields, its application market is extremely broad. Another important application area of polycarbonate in optical lenses is as a lens material for children's glasses, sunglasses and safety glasses, and adult glasses. The average annual growth rate of polycarbonate consumption in the world's eyewear industry has remained above 20%, showing great market vitality.
Basic material of CD
With the rise of the information industry, optical discs made of optical-grade polycarbonate, as a new generation of audio-visual information storage media, are rapidly developing at an extremely fast rate. With its excellent performance characteristics, polycarbonate has become the main raw material for the world's optical disc manufacturing industry. The amount of polycarbonate consumed by the world's optical disc manufacturing industry has exceeded 20% of the overall consumption of polycarbonate, and its average annual growth rate has exceeded 10%. China's optical disc production has grown rapidly. According to figures released by the State Administration of Press and Publication, there were 748 optical disc production lines nationwide in 2002, with an annual consumption of about 80,000 tons of optical-grade polycarbonate, all imported. Therefore, the application prospect of polycarbonate in the field of optical disc manufacturing is extremely broad.
Because of its clarity and toughness, hm producers and buyers of food storage stocks prefer polycarbonate. When compared to silica glass, polycarbonate fiber is as lightweight and highly brittle. Polycarbonate fiber is mostly used in disposable plastic water bottles and reused plastic water bottles. More than 100 studies have explored the environmental impact of bisphenol A residue oozing from synthetic polycarbonate.
Howdeshell et al. Found that at room temperature an endocrine interferon bisphenol A appears to be infiltrated into water from polycarbonate animal cages, and it may be the cause of the growth of the female mouse's reproductive organs.
A document published by Vom Saal and Hughes in August 2005 to analyze the impact of bisphenol A leachate's low dose seems to have found a hint that there is a relationship between financial funding and conclusions:
Industry-sponsored research appears to have tended to find no major effects. Government-sponsored research tends to find significant impact.
Affects the reproductive system
Sodium hypochlorite and other alkaline detergents should not be used in polycarbonate fibers, otherwise it will release an endocrine interferon phenol methane (bisphenol A), which will affect the reproductive system.
Application field editor
Polycarbonate is a general-purpose engineering plastic with excellent performance. Since its inception, it has rapidly formed industrial production in developed countries, and the technology has continued to develop, and the scale of equipment has continued to expand. Due to its good optical transparency, high impact strength, and excellent thermal stability, creep resistance, cold resistance, electrical insulation, and flame retardancy, polycarbonate is used in transparent building boards and electronic appliances , CD media, automotive industry and other fields have been widely used.
Synthetic material editing
Polyethylene; Polyvinyl chloride; Polystyrene; Polyvinyl alcohol; Polypropylene; Polyacrylic acid; Polybutene; Polyisobutylene; Polysulfone; Polyoxymethylene; Polyamide; Polycarbonate; Polylactic acid; Polytetrafluoroethylene; Poly Ethylene terephthalate; epoxy resin; phenolic resin; polyurethane
Butadiene rubber; Styrene-butadiene rubber; Nitrile rubber; Neoprene
Polypropylene; Polyester; Nylon; Acrylic; Spandex; Vinylon; Nylon; Dacron; Kevron
Technological backward editor
Although China started earlier in polycarbonate research and development, many companies have conducted R & D and production, but due to backward technology, small production equipment, low production capacity, and poor product quality, only one company remains to maintain production. The required polycarbonate had to rely heavily on imports. Therefore, vigorously strengthening the research and development of polycarbonate and accelerating the realization of its large-scale industrialization has become an important strategic demand of the country.
Important breakthrough editor
Changchun Yinghua Institute of Chinese Academy of Sciences, in cooperation with Gansu Yinguang Juyin Chemical Co., Ltd., innovatively used one-step phosgene interface method to prepare polycarbonate in 2005, and achieved success on the small test level. Its achievements are in the selection and synthesis of process routes Selection of reaction conditions
, Physical and chemical analysis of products have made important breakthroughs. On this basis, with the strong support of the Gansu Provincial Department of Science and Technology and the Lanzhou Branch of the Chinese Academy of Sciences, they also took the opportunity to carry out industrial R & D of polycarbonate with an annual output of 500 tons.
In 2005, Changchun Yinghua Institute and Juyin Co., Ltd. undertook the scientific and technological research project of Gansu Province, "an annual output of 500 tons of polycarbonate pilot test technology research and development." After more than three years of joint research, it has broken through the key technologies of interfacial polycondensation, resin washing and separation, resin analysis and other technologies. It independently designed and successfully built a polycarbonate production line with an annual output of 500 tons. The main performance indicators of the products produced reach International level of similar products.
This achievement broke the foreign monopoly on China's polycarbonate production technology, and formed a complete set of polycarbonate production technology with China's completely independent intellectual property rights, which will lay the foundation for the future development of 10,000-ton polycarbonate technology and accelerate the realization of large-scale industrialization. Important technical foundation.
PC polycarbonate glass tube has the following advantages:
High light transmittance, transparency, low haze (Haze), light transmittance of 93%, diameter specifications from outer diameter Ф5-Ф800, etc.
Excellent weather resistance, suitable for the following environments:
-Indoor and outdoor use.
-High humidity environment.
-Sunlight ultraviolet radiation.
-Thermoformed lighting fixtures are crack-resistant for long-term use.
PC polycarbonate transparent sound insulation board
PC polycarbonate transparent sound insulation board
Good solvent resistance.
At night, the Expo venues are more playful and smart. At this time, the Expo Park is about to stage another splendid performance. All venues will be lit. With the help of light, shadow and sound, the Expo venues at night will be more playful and smart. Recently, I was fortunate to have a night tour of Puxi World Expo. There are two viewing platforms recommended by tourists on foot. One is the Oil Pavilion, the State Grid Pavilion, and the elevated walkway near the Coca-Cola Pavilion. A variety of colorful images will appear in the blue "oil cube" of the exterior of the oil museum at night, and the State Grid Pavilion is covered by a large area of transparent crystals. At night, it turns into a veritable "magic box", with light and shadow moving Ambilight. In addition, it is directly opposite the China Pavilion, Cultural Center and Expo Axis. On the right hand side is the Lupu Bridge like Changhong. Many photography enthusiasts came here with tripods. Of course, there is a bit of cold wind blowing at night, and the second recommended viewing point is located in a semi-open room. Since dining at night is not stressful, tourists are advised to go to the restaurant next to the river. The reporter noted that some restaurants have viewing seats on the second floor. From the fence, you can see the Huangpu River and the Pudong Park on the other side. The steamers on the Pujiang River are booming, and tourists can enjoy the beautiful scenery on both sides while taking a nap. These luminous bodies are all credits for LEDs, but behind them are PC (polycarbonate) tubes, which play a role in "pin-through". Expo night view, an LED feast-the Expo Park at night lights up. Sitting on the ferry between the two banks of the Pujiang River, traveling on the avenue of the Expo Park, the idioms "Ambilight", "Dazzling" and "Five colors" can all come to mind.
Many of the lights in the park come from the so-called "LED" components. Its full name is "Light Emitting Diode", a solid-state semiconductor element that can convert electrical energy into visible light. It is millions of LEDs that light up the Shanghai World Expo. In the Expo Park, the most beautiful night view is probably located in the Enterprise Pavilion in Area D of Puxi. The nickname of the Petroleum Museum is "Oil Cube", and its outer wall can change different colors at night: cruising dolphins, blue sea, giant letters of "EXPO2010", brown sand sea, black oil, all People seem to be in it. Next to the "oil cube" is the Coca-Cola Pavilion, and tourists like to call it the "Coke Bottle". A giant 15 meters high
Pictures (2 photos)
The bottle is embedded in the middle of the venue. According to the marketing director of Coca-Cola China Expo, this is the largest L in the company ’s global system.
ED bottled display. The interior is built with steel frames. The weight of the entire "bottle" exceeds 10 tons and consumes more than 3,000 LED luminous strips made in Germany. What is particularly unique is that, due to the material properties of LEDs, there has never been a screen like a bottle before-it is the world's first. At night, the national flags and Expo logos that flash on the "bottle" are particularly eye-catching. The Shanghai Enterprise Joint Pavilion next to the Coke bottle is known as the "Magic Cube". This cuboid building that looks unappealing during the day shares more than 20,000 LED light bars. The total length of the tube is about 110,000 meters. It is divided into 129 pieces of independent control and can form a three-dimensional rectangle . The "pin lead" for these tubes is a "polycarbonate transparent plastic tube". The raw material of this mouth is from a used CD. As many as 30 million waste CDs are generated each year in Shanghai, only 25% of which are recycled. If they are developed into plastic tubes, they not only save resources but are also very environmentally friendly.
PC tubes are mainly used in construction and other fields.
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