polyethylene
DATE：2022/7/13 9:20:05 / READ： / SOURCE：This station
polyethylene
Polyethylene plastic is made of polyethylene glycol and granulated with a small amount of antioxidant, smoothing agent and other plastic additives. Polyethylene is a series of varieties that can be produced by a variety of processes and have a variety of structures and characteristics, with hundreds of varieties. At present, many varieties are used: low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (ll DPE) and some varieties with special properties, such as ultra high molecular weight polyethylene (uhm WPE), low molecular weight polyethylene (LMWPE), high molecular weight high density polyethylene (hmwhdpe), very low density polyethylene (VLDPE), cross-linked polyethylene (VPE), chlorinated polyethylene (CPE) and various ethylene copolymers. Lithium battery diaphragm production line www.handern comLow density polyethylene low density polyethylene (LDPE) is polymerized with ethylene as monomer and organic peroxide as initiator under high pressure of 100~300mpa, so it is also called high pressure polyethylene. The density is in the range of 0.91~0.925g/cm. In addition, the density is 0926~0.940g/cm ³ Is called medium density polyethylene; The density below 0910g/cm3 is called very low density polyethylene (VLDPE). Lithium battery diaphragm production line www.handern com
Performance characteristics: low density polyethylene is milky white waxy translucent solid particles, non-toxic and tasteless. The density is within the range of 0.910~0.925g/cm3. Among polyethylene resins, except ultra-low density polyethylene resin, it is the lightest variety. Compared with HDPE, its crystallinity (55% - 65%) and softening point (90-100 ℃) are lower; It has good softness, extensibility, transparency, cold resistance and processability; Good chemical stability, resistant to acid, alkali and salt aqueous solutions; Good electrical insulation and air permeability; Low water absorption; It is easy to burn and emits a gas with paraffin smell. The mechanical strength of low-density polyethylene is lower than that of high-density polyethylene, and its moisture permeability, heat resistance, oxidation resistance and solar aging performance are poor. It is easy to age and decompose under the action of sunlight or high temperature and change color, and its performance is reduced. Therefore, when applying low-density polyethylene, antioxidants and UV absorbers should be added to improve its shortcomings. In addition, the adhesion and printability of low-density polyethylene products are very poor. In order to improve this application, the surface needs corona treatment or chemical corrosion before application. See table 2-1 for the performance parameters of polyethylene with different densities table 2-1 performance parameters of polyethylene with different densities test high density term method low density medium density rate / (g/10rrin) melt flow rate melt flow rate / (/10mi plastic extrusion molding technician hand good lithium battery diaphragm production line www.handern.com
Molding method and application low density polyethylene resin can be extruded, injected, blown and cast to form plastic products.
The extruder can be used to extrude film, pipe, sheet, various profiled materials, wire insulation protective layer and other products. In addition, blow film can be formed by extrusion blow molding, and hollow containers such as blow bottles and barrels can be extruded. Injection molding machine can be used to inject daily necessities, stationery, toys and some industrial accessories. In addition, extrusion coating and composite film are used to compound with paper, board and other plastic films to form moisture-proof packaging paper for the packaging of various items. The rigidity, wear resistance and air permeability of medium density polyethylene are between low-density polyethylene and high-density polyethylene. Generally, it is only suitable for extruded pipes, lining films and packaging films of cooking bags. Lithium battery diaphragm production line www.handern com
High density polyethylene: high density polyethylene (HDPE) is formed by polymerization of ethylene under low pressure with Ziegler catalyst and metal oxide catalyst, so it is also called low pressure polyethylene. The density is 0.940~0.965g/cm ³ between.
Performance characteristics: high density polyethylene is a kind of white powder or granular product, which is non-toxic, leafless, Lake forming and various salts. It is a generation of aging resistant lithium battery diaphragm production line www.handern com
The hardness, tensile strength and denaturation are better than those of clarity laiyiqi, and the crystallinity is 80 months to 90 years,
The initial sex is timely to the sex school, because it is slightly worse than the sensitivity to the second phase, Bo continued; Bo Liang has low permeability to water, falling gas and air, and low warm water property; Good. It can't be used in any organic solvent at room temperature, and it is acid resistant.
Poor resistance to environmental stress. The dining performance is not as good as that of the Denan durong ethyl end, especially the thermal oxidation will degrade its performance. It is insufficient to add anti oxidants and no external line warming agents to improve this aspect. For height, the thermal deformation temperature of ethylene film under stress is low, which should be paid attention to when applying. Lithium battery diaphragm production line www.handern com
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