polyethylene
Polyethylene is the most productive variety in the plastic industry. Polyethylene is an opaque or translucent, light crystalline plastic, which has excellent low temperature resistance (the lowest service temperature can reach -70 ~- 100℃), good electrical insulation and chemical stability, and can resist most acid and alkali corrosion, but not heat. Polyethylene is suitable for processing by injection molding, blow molding and extrusion. PE can be divided into: low density polyethylene LDPE；; High density polyethylene HDPE；; Linear low density polyethylene LLDPE.
polypropylene
Polypropylene is a thermoplastic obtained by polymerization of propylene. It is usually a colorless translucent solid, odorless and nontoxic, with a density of 0.90 ~ 0.9 1.9g/cm. It is the lightest ordinary plastic. Its outstanding advantages are better boiling resistance, corrosion resistance, strength, rigidity and transparency than polyethylene. Its disadvantages are poor impact resistance at low temperature and easy aging, but it can be modified and added with additives respectively.
Polypropylene is widely used because of its low price, good comprehensive performance and easy processing. Especially in recent years, the rapid development of polypropylene resin modification technology has made it widely used. Ordinary polypropylene can be modified by chemical modification methods and physical modification methods such as * * * polymerization, crosslinking, grafting, etc., which expands the application range and has the same performance as engineering plastics.
Polypropylene can be made into furniture, tableware, kitchenware, pots, barrels, toys and so on. Can be made into various farm tools, fishing nets, mushroom culture bottles, etc. It can be made into many parts of automobiles, such as steering wheel, dashboard and bumper. It can be made into TV sets, tape recorders, washing machines, etc. It can be made into flat silk woven into woven bags, made into packing belts, and can also produce various films for heavy packaging bags (such as grain, sugar, salt, fertilizer and synthetic resin) to make cigarette filters; It can be made into industrial cloth, carpet, clothing cloth and decorative cloth, especially polypropylene geotextile, which is widely used in highway and reservoir construction and plays an important role in improving engineering quality. Can be made into disposable syringes, surgical gowns, personal hygiene products, etc. Polypropylene material has good printing performance and can print particularly bright and colorful patterns.
polyvinyl chloride
Polyvinyl chloride is a kind of plastic polymerized from vinyl chloride. By adding plasticizer, its hardness can be greatly changed. Hard products, even soft products, made of it are widely used. In China, PVC is widely used in films, such as agricultural shed film, plastic sheeting, shed cloth and packaging materials. It can be widely used to manufacture pipes, sheets and profiles, and applied to the construction industry, such as PVC doors and windows, water pipes, etc. Transparent PVC sheet is used for food packaging; PVC is used in artificial leather to make furniture such as bags and sofas. Used for foaming products, such as sports shoes, car cushions, floor leather, wallpaper, etc. In terms of wires and cables, it is mainly used as sheath material.
polystyrene
Polystyrene can be divided into ordinary polystyrene (GPPS), high impact polystyrene (HIPS) and expandable polystyrene (EPS).
GPPS is odorless, odorless, nontoxic, hard, excellent in transparency, dimensional stability, electrical insulation, radiation resistance, coloring, hardness, surface hardness, brittleness, low heat resistance, poor sunlight resistance, general chemical resistance, and soluble in various solvents. Mainly used for daily crystal, stationery, lamps, indoor and outdoor decorations, cosmetic containers, fruit bowls, instrument shells, seed covers, food packaging, etc.
HIPS has good rigidity, good coloring, good impact resistance, tensile strength, hardness, light resistance and luster, which are not as good as GPPS, with greatly reduced transparency and poor weather resistance. Mainly used for packaging materials, such as food, cosmetics, daily necessities, mechanical instruments and stationery; It can also be used in household appliances, such as housings of household appliances and meters, electrical accessories, buttons, automobile parts, medical equipment accessories, stationery, office supplies, various decorative pieces, lighting equipment, furniture, toys, etc.
EPS, also known as expanded polystyrene, is made by suspension polymerization of styrene with the participation of foaming agent. The foaming agent is added before polymerization or penetrates into polystyrene beads under heating and pressure. This material can be further processed into foam plastic, which has good cushioning, shockproof, heat insulation and sound insulation properties, and is mainly used in packaging materials and construction fields.
aminoplast
Amino polymer is a kind of plastic which is formed by polycondensation of raw materials with amino functional groups (urea, melamine and aniline) and aldehydes (mainly formaldehyde). It mainly includes urea-formaldehyde, melamine formaldehyde, aniline formaldehyde, and resins such as urea, melamine and formaldehyde polycondensation. Amino resin can be made into plastic powder, reinforced plastic for compression molding, injection molding and transfer molding, and can also be made into laminated plastics. These products can be widely used in electrical parts, daily necessities and tableware.