What kind of gas does EPE foam cloth (pearl cotton) use?
Pearl cotton (cotton) is also called LDPE polyethylene, or EPE for short.In the production process of EPE high-foaming sheet, the physical foaming agent gas is first required to be in a gaseous state in the standard state, and it is easy to liquefy under the condition of pressurization through the special high-pressure metering pump. Because EPE resin foaming is the result of the physical foaming agent changing from liquid to gaseous state.
Secondly, the requirements for the blowing agent gas should be odorless, colorless, non-toxic, non-corrosive, leaving no residue after the polymer foaming product, low permeability in polyethylene melt, and low vapor pressure at room temperature , High volatility, small molecular weight, high density.
Third, the gas cost per unit volume of the blowing agent gas is low. When extruded, it can be melted in polyethylene. When the temperature and pressure are increased, the melting amount will increase, and it is easy to foam plastic into a foam with a low density.
In recent years, many improvements have been made to the improvement of EPE foaming agents in China. From the late 1970s to the early 1980s, domestic EPE foaming manufacturers used Freon (CFC) as the foaming agent. Due to the large amount of CFC, the atmosphere Damage occurred. Therefore, during the period from the late 1980s to the early 1990s, foreign countries such as Germany, Italy, Japan and other developed countries began to use R600 to replace CFC. At the same time, China's more developed regions such as Shenzhen, Guangdong, Hangzhou, Jiangsu Start using R600 gas. With the increase in market usage and the increase in cost, in order to reduce costs, some domestic EPE foam product manufacturers are also looking for additional foaming agents, such as carbon dioxide SO2E and nitrogen N2 to test foaming to obtain their foam products.
In the past 11 years, our company has manufactured and sold EPE foaming extruders. The domestic foaming agent generally uses R22 difluorochloromethane gas and R600 high-purity n-butane gas. But there is really little knowledge about the composition of the internal components of R600 and R22 gas, and how the gas is foamed in the product, how to select and use the foaming agent to ensure the density of the product and the safety of the production process.
In order to provide relevant technical support and guidance to customers who have purchased our company's foaming machine at home and abroad, to ensure production safety, from this period, our company will give you a detailed introduction to the relevant knowledge of the gas used in the foaming of pearl cotton. To achieve the purpose of learning together.
R22 Difluorochloromethane (1)
Gas name model: R22
Main basic parameters
Packaging, transportation and storage: steel cylinder
Technical Parameters
Product grade: Premium
Content ≥ (%): 99.9
Main ingredients: R22
Gas Name: Difluorochloromethane (R22)
Physical properties
Molecular formula CHCLF2
Molecular weight 86.47
Boiling point (℃) -40.80
Freezing point (℃) -160.00
Liquid density 30 ℃ (kg / m3) 1174.20
Critical temperature (℃) 96.20
Critical pressure (MPa) 4.99
Ozone destruction potential ODP 0.034
Global warming coefficient GWP 1700.00
Quality Standard
Purity ≧ 99.90 ％
Moisture ≦ 0.001%
Acidity ≦ 0.00001%
Evaporation residue ≦ 0.01%
Chloride (Cl-) test-
Appearance is colorless and turbid
No smell
The main purpose:
It is a colorless gas at room temperature and a colorless transparent liquid under its own pressure. It is non-toxic, non-flammable, has good thermal and chemical stability, and does not corrode metals. It is a low-temperature refrigerant with a refrigerant temperature of -80 ° C. It is an important raw material for the production of polytetrafluoroethylene and an intermediate for the production of fire extinguishing agent 1211.
Packing specification:
Non-reusable cylinders-13.6kg (30 lbs), 22.7kg (50 lbs)
Reusable cylinders-400 liters, 800 liters, 1000 liters
ISO-TANK
R600 high purity n-butane (2)
Gas name: R600 (high purity n-butane)
Executive standard: Q / SHZL 007-1999
Product quality index:
Below propane and ethane (V / V%) <0.05
N-butane: ≥99.9%
C5 content, (V / V%) ≤ 0.04
Unsaturated hydrocarbon content, (V / V%) ≤ 0.01
Sulfur PPM: ≤ 1
Product physical and chemical properties:
Properties: colorless flammable gas
Melting point: -138.35 ℃
Boiling point: -0.5 ℃
Relative density: 2.4553kg / m
Refractive index: 1.3326
Solubility: Insoluble in water, soluble in ethanol, ether, chloroform and other hydrocarbons.
Residue (ml / 100ml): ≤0.01
Water: No free water
The main purpose:
It can be dehydrogenated to produce butadiene and oxidized to produce acetic anhydride butadiene anhydride. It can react with sulfur to generate thiophene in the gas phase, and can also be used as a blowing agent.
Precautions:
Butane is a flammable and explosive compressed gas, and mixed with air can form an explosive mixed gas. Therefore, when storing, it should be stored in a cool, ventilated warehouse. Keep away from fire and heat. Do not mix with oxidant products. The workplace should be ventilated and open flames are prohibited.
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contact me. WhatsApp:+86-15966835076.
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