There are many kinds of plastic materials. The differences and uses of PP, PVC, PE, PS, ABS and PC pipe materials are analyzed in detail.
PP: Polypropylene. It is odorless, tasteless and non-toxic. It is the lightest resin in common use. The mechanical properties are excellent. Good heat resistance, continuous use temperature can reach ll0-120 C. It has good chemical stability and does not interact with most chemicals except strong oxidants. Water resistance is particularly good. Electrical insulation is excellent. However, it is easy to aging and has poor impact strength at low temperature. The application fields are used to make injection products, films, pipes, sheets, fibers, coatings and so on. Widely used in household appliances, automobiles, chemical industry, construction, light industry and other fields.
PVC: Low molecular weight soluble in ketones, esters and chlorinated hydrocarbons and other solvents. High molecular weight is insoluble. Polyvinyl chloride (PVC) plastics are obtained by processing and moulding of PVC resins. Its monomer cost is low, production technology is mature and easy to process. Acid and alkali resistance, wear resistance, good electrical insulation, non-combustion, but poor thermal stability and light resistance. Hydrogen chloride is released from decomposition at 140 C. Stabilizers are needed in the process of processing and moulding. The softening temperature is low and is limited to use below 80 C. Soft plastics and hard resins can be prepared according to the amount of plasticizers added. Soft plastics can be used as wire and cable wrapping and other insulation materials, can be made into transparent film, used as raincoats, tablecloths, agricultural seedling film, etc., and also used to make artificial leather, foam plastics and polyvinyl fibers. Hard plastics can be used for sheet metal, pipeline, storage tank, absorption tower, etc. Vinyl chloride is polymerized by suspension polymerization, and powdered resin can be obtained. If emulsion polymerization is used, paste resin can be obtained.
PE: Polyethylene is odorless and non-toxic. Chemical resistant, insoluble in solvents at room temperature. Low temperature resistance, minimum operating temperature - 70 ~100 C. It has good electrical insulation and low water absorption. Physical and mechanical properties vary with density. In industry, low density polyethylene (LDPE) is mainly polymerized by free radical at high pressure (110-200 MPa) and high temperature (150-300 C). Other polyethylene products with density of 0.87-0.96g/cm3 can be produced by low pressure coordination polymerization. It is called full density polyethylene process technology. Polyethylene can be processed into thin films, wire and cable sheaths, pipes, various hollow products, injection moulding products, fibers and so on. Widely used in agriculture, packaging, electronic and electrical, machinery, automobiles, daily necessities and other aspects.
PS: polystyrene. Mainly used for audio and video products and CD disc boxes, lamps and interior decorations, high-frequency electrical insulation parts. Its biaxially oriented film is the main material in packaging and electrical industry.
ABS: ABS plastics. ABS can be divided into general grade (including various impact grade), flame retardant grade, heat-resistant grade, plating grade, transparent grade, structure foaming grade and modified ABS according to its use. The general level is used to manufacture gears, bearings, handles, machine shells and components, various instruments, computers, recorders, televisions, telephones and other shells and toys; the flame retardant level is used to manufacture electronic components, such as computer terminals, machine shells and various household appliances; the structural foaming level is used to manufacture the shells of electronic devices; the heat-resistant level is used to manufacture automation in power plants. Chemicals and motor housing, plating grade for automotive parts, knobs, nameplates, decorations and daily necessities, transparent grade for making dials, food pans in refrigerators, etc.
PC: Polycarbonate is a common material in daily life. Due to its colourless transparency and excellent impact resistance, the common daily applications are CD-ROM, eye slices, water bottles, bullet-proof glass, goggles, bank anti-corruption glass, headlights, etc., animal cages and pet cages.
Polyoxymethylene (Polyformaldehyde) POM (Polyformaldehyde Resin) Definition: Polyformaldehyde is obtained by the polymerization of formaldehyde. It is a high density, high crystallinity thermoplastic engineering plastics. It has good physical, mechanical and chemical properties, especially excellent friction resistance. It is precisely because these excellent chemical and physical properties can be compared with steel, and the weight is lighter than steel, it is called "Saigang"! Specific gravity: 1.41-1.43 g/cubic centimeter forming shrinkage: 1.2-3.0% forming temperature: 170-200 C drying conditions: 80-90 C 2 hours material performance is better, strength, stiffness, wear resistance, water absorption, size stability is good, but thermal stability is poor, flammable, easy to aging in the atmosphere exposure. Suitable for making wear-resistant parts, transmission parts, chemical industry, instrumentation and other parts. 1. Crystalline material, narrow melting range, fast melting and solidification, material temperature slightly below the melting temperature will crystallize. Medium liquidity. It has little moisture absorption and can not be dried. 2. Low friction coefficient, good elasticity, the surface of plastic parts is prone to wrinkle pattern surface defects. 3. It is easy to decompose at 240 degrees. There are irritating and corrosive gases in decomposition. Therefore, the die steel should be made of corrosion resistant materials.
