The application of LLDPE in plastic film
Linear low-density polyethylene is essentially a thermoplastic resin made of ethylene as the main raw material, a small amount of α-olefin and a catalyst, polymerized in a fluidized bed under high or low pressure, and its appearance appears Milky white granules, mainly suitable for film and tube products at this stage. Why is LLDPE more suitable for making films? First of all, from the perspective of the production process of LLDPE, usually LLDPE is a linear short-branched structure formed by polymerizing ethylene and high-grade α-olefins such as butene, hexene or octene at low temperature and low pressure, and has a narrower structure than LDPE The molecular weight distribution of its molecular weight distribution, its melt flow characteristics are more suitable for the needs of the new process, especially suitable for the film extrusion process, the second step process is to add advanced α-olefin to make it resistant to penetration, anti-lift, sprint and tear resistance The cracking performance has been greatly improved, so it is more suitable for manufacturing films. The application of LLDPE in plastic films At present, about 70% of LLDPE produced on the market is used in film products, and LLDPE film products are mainly divided into two categories, namely agricultural films and packaging films. Over the years, China's linear low density films It accounts for up to 75% of the agricultural film market. The development of anti-permeable mulch films provides a huge market for LLDPE films. As a packaging film, LLDPE is generally used in industrial villages and packaging bags. Compared with LDPE, LLDPE has excellent resistance to environmental stress cracking, so it is widely used in heavy industrial packaging. Development of plastic film in China According to statistics of relevant data, China's plastic film accounts for 20% of the total output of plastic products, and its demand is growing at a rate of more than 9% per year. In 2017, the average growth rate of domestic plastic film was 8.4%, which was greater than the overall plastic products. Increase. In 18 years, due to multiple impacts of environmental protection policies, plastic bans, etc., plastic film started a downward mode, with an average monthly decline of 17.7%. In the later period, the plastic film industry must vigorously develop harmless, low-carbon, and safe plastic packaging films to adapt to the gradual trend. Strict environmental protection policies to achieve stable growth of plastic packaging films.