Production method of low density polyethylene
- Categories:Low density polyethylene News
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- Time of issue:2022-10-24 14:44
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(Summary description)According to the polymerization method, low density polyethylene can be divided into high pressure method and low pressure method. According to the type of reactor,
Production method of low density polyethylene
(Summary description)According to the polymerization method, low density polyethylene can be divided into high pressure method and low pressure method. According to the type of reactor,
- Categories:Low density polyethylene News
- Author:
- Origin:
- Time of issue:2022-10-24 14:44
- Views:
According to the polymerization method, low density polyethylene can be divided into high pressure method and low pressure method. According to the type of reactor, it can be divided into kettle method and tubular method. Using ethylene as raw material, it is sent into the reactor, and the polymerization reaction is carried out by high pressure compression under the action of the initiator. Close, send to packaging.
Both LDPE and LLDPE have good rheology or melt flow. LLDPE has less shear sensitivity because of its narrow molecular weight distribution and short chain branches. During shearing (eg extrusion), LLDPE retains a greater viscosity and is therefore more difficult to process than LDPE with the same melt index. In extrusion, the lower shear sensitivity of LLDPE results in faster stress relaxation of the polymer molecular chains and thus less sensitivity of physical properties to changes in blow-up ratio.
In melt extension, LLDPE generally has lower viscosity at various strain rates. That is, it will not strain harden when stretched like LDPE. As the deformation rate of polyethylene increases, LDPE shows a surprising increase in viscosity, which is caused by molecular chain entanglement.
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