Views: 0 Author: Site Editor Publish Time: 2021-09-01 Origin: Site
Krah machine's HDPE is a thermoplastic polyolefin produced by copolymerization of ethylene. Although HDPE was launched in 1956, the HDPE of this Krah machine has not yet reached a fully mature level. This general-purpose material is constantly developing its new uses and markets.
Here is the content list:
l Features of HDPE
l HDPE production process
l HDPE additive use
Features of HDPE
The high-density polyethylene of the Krah machine has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. The HDPE dielectric properties of the Krah machine are also good in resistance to environmental stress cracking. Hardness, tensile strength, and creep are better than low-density polyethylene; Krah machine's HDPE has better abrasion resistance, electrical insulation, toughness, and cold resistance, but it is slightly worse than low-density insulation; Krah machine's HDPE has good chemical stability. It is insoluble in any organic solvents at room temperature and is resistant to corrosion by acids, alkalis, and various salts. Krah machine's HDPE film has low water vapor and air permeability and low water absorption.
HDPE production process
The most common production method of the Krah machine's PE is through slurry or gas phase processing, and a few are produced by solution-phase processing. All these Krah machine processes are exothermic reactions involving ethylene monomer, a-olefin monomer, catalyst system (maybe more than one compound), and various types of hydrocarbon diluents. Hydrogen and some catalysts are used to control the HDPE molecular weight of the Krah machine. The slurry reactor is generally a stirred tank or a more commonly used large-scale loop reactor, in which the HDPE slurry of the Krah machine can be cyclically stirred.
When the ethylene and comonomers (as required) of Krah Machine HDPE come into contact with the catalyst, polyethylene particles are formed. After removing the diluent from the HDPE of the Krah machine, the HDPE polyethylene particles or powder of the Krah machine are dried and the additives are added according to the dosage to produce the HDPE pellets of the Krah machine. The higher molecular weight of the Krah machine's HDPE leads to higher polymer viscosity, but the viscosity is also related to the temperature and shear rate used in the test. Krah machine's HDPE uses rheology or molecular weight measurement to characterize the molecular weight of the material. Krah machine's HDPE grade generally has a molecular weight range of 40 000 to 300 000, and the weight average molecular weight roughly corresponds to the melt index range, which is 1000.029g/10min (230°C, 2.16kg). Generally, the higher Mw (lower melt index MI) of Krah machine HDPE enhances melt strength, better toughness, and ESCR, but higher Mw makes the HDPE processing process of the Krah machine more difficult or requires higher Pressure or temperature.
HDPE additive use
The addition of antioxidants can prevent the Krah machine's PE polymer from degrading during processing, and prevent the Krah machine's finished products from oxidizing during use. Antistatic additives are used in many packaging grades to reduce the adhesion of Krah machine bottles or packaging to dust and dirt. The specific application of the Krah machine requires special additive formulations, such as copper inhibitors related to wire and cable applications. The excellent weather resistance and anti-ultraviolet (or sunlight) of the Krah machine can be achieved by adding anti-UV additives. Krah machine is not added with anti-ultraviolet or carbon black PE. It is recommended not to use the Krah machine continuously outdoors.
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