Is polyethylene harmful to the skin, and is polyethylene harmful to the human body?

The physical properties are relatively stable, there is no harm to the first class, and it is a relatively environmentally friendly organic material.

Polyethylene (PE) is a polymer made of ethylene, which has been developed for about 60 years, and the global polyethylene production ranks first among the five general-purpose resins.

Polyethylene is divided into high-density polyethylene according to the polymerization method, molecular weight and chain structure.

Low-density polyethylene and linear low-density polyethylene.

It is characterized by the fact that polyethylene is a typical thermoplastic.

It is an odorless, tasteless, non-toxic flammable white powder. The PE resin processed by molding is a waxy granular material that has been extruded and granulated, and its appearance is milky white. Its molecular weight is in the range of 10,000 loa. If the molecular weight exceeds 100,000, it is ultra-high molecular weight polyethylene.

f uhmwpe3。The higher the molecular weight, the better its physical and mechanical properties, and the closer it is to the required level of engineering materials. However, the higher the molecular weight, the more difficult it is to process.

Polyethylene has a melting point of 100-130C, and its low temperature resistance is excellent. It can still maintain good mechanical properties at -60, but the operating temperature is 80 110.

Polyethylene has good chemical stability and can resist dilute nitric acid, dilute sulfuric acid and any concentration of hydrochloric acid and hydrofluoric acid at room temperature.

Phosphoric acid, formic acid, acetic acid.

Ammonia, amines, hydrogen peroxide.

Sodium hydroxide, potassium hydroxide and other solutions. However, it is not resistant to strong oxidizing corrosion, such as oleum, concentrated nitric acid, chromic acid and sulfuric acid mixture. These solvents will have a slow erosive effect on polyethylene at room temperature, while concentrated sulfuric acid and concentrated nitric acid will quickly attack polyethylene at 90-100, causing it to destroy or decompose.

Under the action of atmosphere, sunlight and oxygen, polyethylene will age, discolor, crack, brittle or pulverized, and lose its mechanical properties. At the molding processing temperature, it will also reduce the melt degree due to oxidation, and discoloration and streaks will occur, so attention should be paid to the molding processing and use process or material selection. Because polyethylene has the above characteristics and is easy to process and mold, the recycling of polyethylene** has a very far-reaching value.

Polyethylene is harmless to the human body but carcinogenic, many plastic products in daily life are made of polyethylene plastic, this plastic bottle is used to hold mineral water, cola and soda and other non-fat-soluble beverages, harmless to the human body, but if it is used to contain vegetable oil, wine, soy sauce, vinegar and other fat-soluble organic liquids, it will make the ethylene monomer in the bottle slowly dissolve out, this substance contains carcinogenic factors.

In addition, the shell of plastic bottles is generally thin, has high transparency, is easy to age, and is subject to the action of oxygen and ultraviolet rays, which will produce a strong odor. If you store condiments in plastic bottles for a long time, people will experience symptoms such as dizziness, headache, nausea, vomiting, loss of appetite, memory loss, and insomnia after eating them. In severe cases, it can also lead to anemia and other diseases.

On October 27, 2017, the World Health Organization's International Agency for Research on Cancer (IARC) released a preliminary list of carcinogens, and polyethylene was included in the list of three types of carcinogens. Polyethylene use: injection molding, extrusion, blow molding and other processing methods can be used.

It is mainly used as agricultural film, industrial packaging film, pharmaceutical and food packaging film, mechanical parts, daily necessities, building materials, wires, cable insulation, coating and synthetic paper.

Long-term exposure to polypropylene is harmful, and polypropylene is found in the ceiling material plastic steel plate, and the prevalence of lung cancer is greatly increased after long-term use.

2014-05-01** "New Security", reporter Wang Qianqian's "Ceiling Safety, Can Not Be Ignored" has a detailed description.

In the process of home decoration, the selection of ceiling materials is particularly important, which has become the key factor that directly determines the firmness of the ceiling. With the continuous evolution of processing and production technology, the material innovation of the ceiling has roughly gone through several important development stages such as PVC board, plastic steel plate, gypsum board, aluminum buckle board, and anodized board. In terms of its safety, it also goes from low to high, showing different use effects.

Wang Yanbin, a professional designer of integrated ceilings, told the reporter of "New Security": "At present, in terms of the material selection of ceilings, they are mainly divided into three different grades: high, medium and low-end. Among them, PVC board and plastic steel plate formed by adding polypropylene are low-end materials.

During long-term use, chlorine gas will be produced under the influence of high temperature, and the prevalence of lung cancer after human exposure will be greatly increased.

The ceiling materials mainly used for laminated boards, roller coated boards, UV boards, etc. belong to the mid-end materials, which have high flame retardancy and mechanical strength. Anodized board is regarded as a high-end material, which is not easy to deform and discolor, and has excellent safety. "The selection and installation of different ceiling panels can effectively avoid the residential risk caused by collapse.