PE pellets is a black polyethylene granule with high molecular weight, linear and medium density. It is mainly used to make optical cable jacket. It has excellent high and low temperature resistance and mechanical properties ,which can effectively meet the production and application of optical cable outer sheath material.
There are many companies in the world that have polyethylene technology，7 companies have LDPE technology, 10 companies have LLDPE and full-density technologies, and 12 companies have HDPE technology. From the point of view of technological development, LDPE produced by high-pressure process is the most mature method in the production of PE resin. Both the kettle-type and tube-type processes have matured. These two kinds of production technologies coexist at the same time. Foreign companies generally use low-temperature and high-activity catalysts to initiate the polymerization system, which can reduce the reaction temperature and pressure.
The production of LDPE by the high-pressure process will develop in the direction of enlargement and tubularization. The low pressure method for the production of HDPE and LLDPE, the main use of titanium and platinum catalysts, Europe and Japan mostly use titanium catalysts, while the United States mostly use the network catalyst.
Catalyst technology: The catalyst is a key part of the PE process and is also the focus of its technological development. In particular, the metallocene catalyst was industrialized in the United States in 1991, and PE production technology has entered a new stage of development.
Most of the world's major PE manufacturers have already been involved in the production of metallocene PE (mPE), such as Dow Chemical, Eastman, Asahi Kasei, Atofina, and Chevron-Phillips.
Japan's Asahi Kasei Chemicals purchased Insite, a Dow Chemical metallocene catalyst patent, and used a slurry process to produce metallocene high-density polyethylene (mHDPE) under the Creolex brand name. Due to its superior performance, the mPE resin consumption in the world has doubled each year since it entered commercial development in 1995. It is estimated that by 2010, the global mPE production capacity will reach 17 million tons, including 7 million tons of mLLDPE and 6 million tons of mHDPE.
The E-catalyst has been developed to the third generation. Japan Mitsui Chemicals and Dow Chemical have jointly developed a new generation of metallocene (Post-metallocene) catalysts. Unlike traditional metallocene and ZN catalysts, this catalyst allows polar monomers such as methyl methacrylate, vinyl acetate, and the like to be copolymerized with olefins, which can be used to develop new adhesive, oil and gas barrier properties. PE pellets
China attaches great importance to PE production technology, PE production technology innovation has been included in the National Technology Innovation Project. Aiming at the domestic PE production with gas phase process technology, the difficulty in product brand switching and more transition materials, domestic PE production enterprises have started to rely on the existing polyethylene production technology transformation, vapor-phase polyethylene condensing, ultra-condensing process and deposition. Slurry Polyethylene External Circulation Process development work and achieved practical results.
Most of Uuipol's production facilities in China have been reformed and expanded using domestic condensation technology. The output has exceeded the original design capacity of the plant by 120% to 200%. PE pellets
Films are widely used as packaging materials for various foods, clothing, medicines, fertilizers, industrial products, and agricultural films (see color pictures). Extrusion can also be used to process composite films for packaging weights. Since 1975, high-density polyethylene film has also been developed. It has high strength, low temperature resistance, moisture resistance, and good printability and processability. The largest use of linear low density polyethylene is also made into a film, its strength, toughness are better than low density polyethylene, puncture resistance and rigidity are also good, although the transparency is poor, still slightly better than high density polyethylene .
Hollow products High density polyethylene is suitable for hollow products because of its high strength. The blow molding method can be used to form containers such as bottles, buckets, cans, tanks, etc., or can be made into large containers such as tank trucks and tanks by casting.
Pipe Sheet Extrusion method can produce polyethylene pipe. High density polyethylene pipe has higher strength and is suitable for underground laying. The extruded sheet can be processed twice. Foam extrusion and foam injection can also be used to make high-density polyethylene into low-foam plastics for use as counters and building materials (see Construction Polymers). PE pellets
Miscellaneous Goods Miscellaneous goods produced by injection molding include household goods, and can also be used in industrial acid and alkali resistant fabrics. Ultra-high-strength polyethylene fibers (strength up to 3 to 4 GPa) have been developed and can be used as bullet-proof vests, composite materials for automobiles and offshore operations. Artificial flowers, totes (see color pictures), small containers, parts for bicycles and tractors, etc. High-density polyethylene is used to make structural parts.