What are the characteristics of polyethylene and what are the characteristics of polyethylene materi

Polyethylene is a semi-crystalline thermoplastic material. Their chemical structure, molecular weight, degree of polymerization, and other properties are highly dependent on the polymerization method used. The aggregation method determines the type and degree of branching.

The degree of crystallinity depends on the chemical structure of the polymer and the processing conditions. Polyethylene is sensitive to environmental stresses (chemical and mechanical) and has poor resistance to heat aging. The properties of polyethylene vary from variety to variety and mainly depend on the molecular structure and density.

Different production methods can be used to obtain products with different densities. Polyethylene can be processed using the molding method of general thermoplastics (see Plastics Processing). It is widely used, mainly used in the manufacture of films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for TVs, radars, etc.

With the development of petrochemical industry, polyethylene production has developed rapidly, and the output accounts for about 1 year of the total plastic output of the world's total polyethylene production capacity, and the capacity of plants under construction is. In recent years, polyethylene has been used as a diffuser in nuclear physics, astrophysics, and reactor operation to determine the structural formula of polyethylene.

Quantity neutrons. He has made his own contribution to the study of nuclear physics. Polyethylene (PE) plastic is a kind of convenient bag that we often mention is polyethylene (PE).

Polyethylene is the simplest polymer in structure and the most widely used polymer material. It is made up of duplicate CH2 units connected. Polyethylene is formed by the addition polymerization of ethylene (CH2=CH2).

The properties of polyethylene depend on how it polymerizes. High-density polyethylene (HDPE) is produced by Ziegler-natta polymerization under conditions catalyzed by organic compounds at moderate pressures (15-30 atm). Under these conditions, the polymerized polyethylene molecules are linear and have long molecular chains, with molecular weights as high as hundreds of thousands.

If it is polymerized by free radicals under high pressure (100-300MPa), high temperature (190 210C), peroxide-catalyzed conditions, the resulting is low-density polyethylene (LDPE), which has a branched structure.

See the encyclopedia for details.

I want to figure out, the PP forum, a lot of PE film information, there are a lot of friends who do PE film and printing bags, many of them.

It is the front-line operator, who is responsible for the technology. There are many types of liquid made of PE particles, including low density, metallocene metallocene, linear type, etc.

Hello, it's a pleasure to answer your questions. Polyethylene is a white waxy translucent material, which feels like wax, flexible and tough, lighter than water, odorless, non-toxic, and has superior dielectric properties; It has excellent low temperature resistance, good chemical stability, can resist the erosion of most acids and alkalis, is inmiscible with general solvents at room temperature, has low water absorption, and has excellent electrical insulation performance. I hope it can help you, and if you have any questions, you can continue to ask.

Polyethylene has excellent chemical stability, and is resistant to various chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, potassium hydroxide, etc., at room temperature, but nitric acid and sulfuric acid have a strong destructive effect on polyethylene;

2.Polyethylene is easy to photooxidation, thermal oxidation, ozone decomposition, and easy degradation under the action of ultraviolet rays, and carbon black has excellent light shielding effect on polyethylene. After irradiation, cross-linking, chain breaking, and the formation of unsaturated groups can occur.

Milky white, translucent thermoplastic made from ethylene homopolymerization and copolymerization with a small amount of olefin. Density 3, according to density, there are low-density polyethylene (including linear low-density polyethylene), ultra-low-density polyethylene, etc. Odorless and non-toxic.

Resistant to chemicals and insoluble in solvents at room temperature. Low temperature resistance, minimum use temperature -70 -100. Good electrical insulation, low water absorption.

Physical and mechanical properties vary depending on density. In industry, low-density polyethylene mainly uses high-pressure (110 200MPa) and high-temperature (150 300) free radical polymerization. Others use low-pressure coordination polymerization, and sometimes the same unit can produce polyethylene products with density 3, known as full-density polyethylene process technology.

Polyethylene can be processed into films, wire and cable sheaths, pipes, various hollow products, injection molded products, fibers, etc. It is widely used in agriculture, packaging, electronic and electrical, machinery, automobiles, daily necessities, etc.

Hope it helps, thank you.

Polyethylene can be used in film products, injection molded products, hollow products, pipe products, silk products, cable products, etc.

1.High-pressure polyethylene: more than half is used for film products, followed by pipes, injection molded products, wire wrappings, etc.

2.Medium and low, pressed polyethylene: mainly injection molded products and hollow products.

3.Ultra-high pressure polyethylene: Due to the excellent comprehensive properties of ultra-high molecular weight polyethylene, it can be used as an engineering plastic.

Low-density polyethylene, also known as high-pressure polyethylene (LDPE), is the lightest variety of polyethylene resin, which is milky white waxy, tasteless, odorless, non-toxic, and has a dull waxy surface. It has good flexibility, elongation, electrical insulation, transparency, ease of processing and certain air permeability. It has good chemical stability, alkali resistance and general organic solvent resistance.

Product performance. Low-density polyethylene has the following characteristics:

1) The film is transparent and soft. The strength is smaller than that of high-density polyethylene, and the impact strength is greater than that of high-density polyethylene.

2) Resistant to cold, low temperature and high temperature. The thicker film can withstand the sterilization process of 90 years of hot water immersion.

3) Good moisture-proof performance, stable chemical properties, insoluble in general solvents.

4) It has greater air permeability, so when used as food packaging that is easy to oxidize, the storage period of its contents should not be too long.

5) The grease resistance is poor, and the product can be slowly dissolved. When packaging foods containing oils and fats, they will have a hala smell after long-term storage.

6) Long-term exposure to ultraviolet rays and heat will age, affecting its physical properties and dielectric properties.

7) The melting point is 110 115, the processing temperature is 150 210, if it is in an inert gas, the temperature can reach 300 and is still stable. However, the melt and oxygen contact are prone to degradation.

Fields of application. Application range of low-density polyethylene: suitable for seasonings, pastries, sugar, candied fruit, biscuits, milk powder, tea, fish floss and other food packaging.

Pharmaceutical packaging such as tablets and powders, and packaging of fiber products such as shirts, clothing, knitted cotton products and chemical fiber products. Laundry detergent, detergent, cosmetics and other daily chemical products packaging. Due to the poor mechanical properties of single-layer PE films, they are often used as the inner layer of composite packaging bags, that is, the heat-sealing substrate of multi-layer composite films.

MDOPE film.

Single-material composite film bag.