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Characteristics and distinguishing methods of PA, PU, PVC, PE, PP materials


PP, PE, PVC are plastic, wherein PE is a polyethylene plastic non-toxic transparent breathable often used in the manufacture of daily necessities such as simple food packaging bags, disposable syringes, water supply and drainage pipe (easy degradation), PP is a highly transparent polypropylene plastic non-toxic corrosion strength, it has all the advantages of PE, commonly used in the manufacture of daily necessities, plastic medical devices such as transparent plastic washbasin, disposable syringes and so on, PVC is a PVC poor air permeability and toxic is also commonly used in wall and ceiling living room supplies and building decoration decoration such as drainage pipelines etc..


PP, PE and PVC are the abbreviations of the English of the plastic names, and the popular appellations of the Chinese people. They are polypropylene, polyethylene and polyvinyl chloride. Another example is PTFE PTFE, FEP is fluorinated ethylene propylene copolymer, PVDF is polyvinylidene fluoride, two ETFE ethylene and ethylene tetrafluoroethylene copolymer is similarly PU poly urethane (polyurethane). 

PU leather refers to cattle, pig leather for the bottom layer two blue leather surface with a layer of polyurethane film products, also called the two layer film leather, PU leather is dry; wet PU leather leather surface with a layer of polyurethane grout in the two layer, and then dried into polyamine based on the high cost of ester coatings and film production, is not much, and has been produced by dry wet turning. 

PVC is polyvinyl chloride (polyvinyl chloride), PVC leather is knitted fabric and the product is covered with a layer of PVC resin film. PVC film is toxic and easy to be aged. It will be replaced by PE plastic film. 

PE for polyethylene (polyethylene, polythene), non-toxic, low cost, the consumption of the province.

PP is polypropylene


PVC

It is the largest amount of plastic in the building. The density of rigid polyvinyl chloride is 1.38 ~ 1.43g/cm3, with high mechanical strength and good chemical stability. The temperature range is generally between -15 and +55 C. It is suitable for making plastic doors and windows, sewer pipes, line grooves and so on

PE

Polyethylene plastic is mainly used in the construction of water supply and drainage pipes, sanitary ware.

PP

The density of polypropylene is the smallest in all plastics, about 0.90. Polypropylene is often used to produce pipes, sanitary ware and other building products.

PS

Polystyrene is a colorless transparent glass - like plastic. Polystyrene is mainly used in the production of foam insulation materials, light transmittance materials and other products.

ABS

ABS plastics are modified polystyrene plastics, which are composed of three groups based on acrylonitrile (A), butadiene (B) and styrene (S). ABS plastics can make plastic decorative boards with pattern patterns.


China's production of food fresh-keeping film is mainly produced by PE material, but some supermarket fresh products such as vegetables, fruits and cooked food packaging use PVC fresh-keeping film, more than 80% of these products come from Japan and Korea. According to experts, PVC food wrap has great harm to the human body, the harmful substances in the plastic film is easy to precipitate, with the food into the body, there are carcinogenic effects on the human body, especially the human endocrine disruption caused by women, breast cancer, birth defects, male reproductive disorder or mental disease. It was because of the serious harm that Europe had banned the use of PVC as a food packaging material a few years ago. Japan also put an end to PVC food packaging in 2000. According to the World Packaging Organization board, the United States, Japan, Singapore, South Korea and European countries have now fully banned the use of PVC packaging materials.The food preservative film was inflow into China in 1995. From the beginning of the year, the amount of the amount is only a few tons, and the annual consumption is more than 15000 tons.


PE (polyethylene) is a very safe chemical material. It is absolutely no problem for food preservation. In contrast, PVC is polyvinyl chloride, is a chemical substance called vinyl chloride polymer, vinyl chloride itself is harmful to human body, though in principle it's harmless PVC polymer, but the polymerization of any chemical substances are not completely, so a certain amount of vinyl chloride polymerization is not completely, but not from these are not separated, the polymerization of vinyl chloride is the culprit carcinogenic PVC material "".

Both PE and PVC are hard plastic. They have a lot of similar uses in addition to the preservative film. Safety and long service life are the strengths of PE materials. Based on the analysis of the two materials, Hu Yadong thinks that the production cost of PE should be lower than that of PVC, because it is extracted directly from petroleum, while PVC has more processing steps in production. There is also a way to extract PVC from alcohol or acetylene, but its cost will be higher.

PVC itself is also hard. But making PVC products, plasticizers are usually added to improve softness, which can make products that are thick but also very soft. The harm of PVC preservative film to human health also comes from the harmful chemical components of plasticizers.

But at present, the use of PVC is more extensive than PE, because it has the advantage that it can easily add plasticizer to adapt to different thickness and softness requirements, so most of the thicker plastic films used for outer packaging are made of PVC. Generally speaking, when using PE material, plasticizer is not added. If thicker material is needed, PE is not soft enough, so the fresh-keeping film made of PE is generally very thin. The most familiar thing about the use of PVC materials is that it is widely used to make cables. The bushing used for buried wires is often made of PVC materials plus a small amount of plasticizers. In this use, the PVC material has no harm to the human body.

In 1960s, it was a scientific problem in our country that PVC and plasticizers were fully mixed in our country. PVC powder is hard spherical under microscope. It is not easy to mix with plasticizers. Their cooperation with Beijing chemical two plant is to make PVC powder more soft and empty and easy to mix with plasticizers. Hu Yadong said that phthalic acid anhydride and phthalic acid anhydride were used as plasticizers, mainly used in industrial materials at that time. At present, the use of ethyl hexyl amine (DEHA) as plasticizer is more commonly used in food preservative film. This material is easier to mix with PVC, and it can take up a large proportion. The harm of PVC fresh-keeping film to human health also comes from the harmful chemical components of plasticizer. However, compared with phosphoric benzene, two phthalic anhydride and phospho benzene two formic anhydride used in industry, this plasticizer has long service life and relatively less harm to human body due to its stability and stability.

Although PVC is more widely used, PE is better in terms of the total amount of use. One of the most famous cables in the world - the British - to - US submarine cable is made of PE. Because the components containing chlorine in PVC materials are easy to decompose, the cables of PVC materials are easy to be aged and brittle, and their service life is relatively low, which can not meet the 50~100 years' service life at that time. The chemical composition of PE is relatively stable and has long service life. The cable does not require much softness. Therefore, PE is used in the production of cable. This is probably one of the most famous "cases" in the use of PE materials.

ABS.PS.PP.PE and other materials, the main use of the characteristics and the difference between the various marks.

ABS has the advantages of good rigidity, high impact strength, heat resistance, low temperature resistance, chemical resistance, mechanical strength and electrical properties, easy processing, processing and dimensional stability and good surface gloss, easy coloring, painting, can also be used for spraying metal, electroplating, welding and bonding etc. two processing performance. Main applications: automobiles, utensils, electronic / electrical, building materials, ABS alloys / blends

PS electrical insulation (especially high-frequency insulation) excellent, colorless and transparent, light transmittance after organic glass, color of water resistance, good chemical stability and strength. In general, but the crisp, easy to produce stress cracking, no resistance to benzene. Gasoline and other organic solvents. Suitable for production of transparent insulation decorative pieces and chemical. Instrument. Optical instruments and other parts.

PE is basically divided into three major categories, that is, high pressure low density polyethylene (LDPE), high density polyethylene (HDPE) and linear low density polyethylene (LLDPE). Thin film is the main processing product, followed by sheet and coating, bottles, cans, barrels and other hollow containers and other kinds of injection and blow molding products, pipes and wires, cables, such as insulation and sheath. It is mainly used in packaging, agriculture, transportation and other departments.

PP is cheap, light, good processability and wide application. The development of catalyst and new technology has further promoted the expansion of application field. Some people say, "as long as a product's material is replaced by plastic, this product has the potential to use polypropylene." Main uses: woven bags, waterproof cloth, durable consumer goods, such as cars, household appliances and carpets.

Polyamide (PA, commonly known as nylon) is the first American DuPont company to develop resin for fiber, and was industrialized in 1939. In 1950s, the development and production of injection molding products were developed to replace the metal to meet the requirements of the lighter and lower cost of the downstream industrial products. PA has good comprehensive properties, including mechanical properties, heat resistance, abrasion resistance, chemical resistance and self lubrication, low friction coefficient, flame retardancy, some easy processing, suitable for filling reinforced with glass fiber and other fillers, improve the performance and expand the scope of application. There are many varieties of PA, such as PA6, PA66, PAll, PAl2, PA46, PA610, PA612, PAl010 and so on. As well as many new varieties developed in recent years, such as semi aromatic nylon PA6T and special nylon, etc.

The name of PET polyethylene terephthalate is linear saturated polyester resin, the first in 1941 by the British J.tt.Whinfield and J.T.Dickon developed PET as fiber material has a history of 53 years, the British Imperial Chemical Company (1.c.I) in 1946 to polyester (Teleron) fiber is put into production, then the U.S. DuPont Co (Dupent) in 1948 on behalf of the spring Lun "(Dacron) fiber production.

EVOH: ethylene vinyl alcohol copolymer (EVOH) of the barrier effect of ethylene polymer processing and vinyl alcohol polymer combined with ethylene vinyl alcohol copolymer not only showed excellent processing performance, but also to the gas, odor, flavor, solvent exhibits excellent blocking effect. Because of the thermal stability of the combination of ethylene with the ethylene, the multilayer container with EVOH barrier layer can be reused completely.

PE is polyethylene plastic, its chemical properties are stable. It usually produces food bags and various containers, and is resistant to acid, alkali and salt solution. But it is not suitable to wipe or soak with strong alkaline detergent.

PP is polypropylene plastic. It is non-toxic and tasteless. It can be soaked in boiling water at 100 degrees, without deformation and damage. Common acid and alkali organic solvents have little effect on it. Used for tableware. 

PS is polystyrene plastic, easy to color, transparent, more used for the production of lampshade, toothbrush handle, toys, electrical components. It is resistant to acid and alkali corrosion, but it is easy to dissolve in chloroform, two chloroethylene, banana water and other organic solvents. PVC is polyvinyl chloride plastic, bright color, corrosion-resistant and durable. Due to the addition of some toxic auxiliary materials such as plasticizers and anti-aging agents in the manufacturing process, its products generally do not store food and drugs. 

ABS is made of acrylonitrile, butadiene and styrene. It is bright, heat-resistant, strong, and can be plated with chromium and nickel on the outer surface. It can make keyboard, button, knife rack, TV case, umbrella handle and so on. 

PA nylon plastics, its characteristic of tenacity, firmness, wear resistance, commonly used in the production of comb, toothbrush, hook, fan, bag rope, fruit bags etc.. Nontoxic, but not in contact with acid and alkali for a long time.



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