Polyurethane is widely used in various industries
Polyurethane products are widely used in light industry, chemical, electronics, textile, medical, construction, building materials, automotive, defense, aerospace, aviation and so on.
Polyurethane thermoplastic elastomer, also known as thermoplastic polyurethane rubber, referred to as TPU, is an (AB) block linear polymer, A is a high molecular weight (1000-6000) polyester or polyether, B is 2- The diol of a 12-chain carbon atom, the chemical structure of the AB segment is linked with a diisocyanate, usually diphenylmethane diisocyanate (MDI). Thermoplastic polyurethane rubbers are crosslinked by intermolecular hydrogen bonds or lightly crosslinked between macromolecular chains. These two crosslinked structures are reversible with increasing or decreasing temperature. In the molten state or the solution state, the intermolecular forces are weakened, and after cooling or solvent evaporation, they are joined together by strong intermolecular forces to restore the properties of the original solid. Polyurethane elastomer is a kind of polyurethane synthetic material. Because of its structure, it has two segments, soft and hard, which can be molecularly designed to impart high strength, toughness, wear resistance and oil resistance. Due to its extremely excellent performance, it is widely used in many fields such as automobile, construction, mining, aerospace, electronics, medical equipment, sports products, etc., and has become a promising synthetic material product.
Castable polyurethane elastomer (PU) is a new type of material between rubber and plastic. In practical applications, it is often used as a replacement for rubber products. Due to excellent wear resistance (best in elastomers), high strength (3-5 times that of ordinary rubber), high elongation (500%-1500%), high elasticity (load support capacity, shock absorption) Good effect), wide hardness range (Shore A20-Shore D70); also has excellent performances such as oil resistance, acid resistance, alkali resistance, radiation resistance, etc. It also has outstanding wear resistance, so there are many occasions in which the wear problem is serious. Important uses, especially in the mining, oil and gas industries. The application fields of cast polyurethane elastomer are: solid tire; printing and conveying rubber roller; pressure rubber roller; oil seal, gasket ball joint, bushing bearing; ○ ring; bolster; sole, back root, baotou; lining; Wait. Elastomers of different choices have different hardness ranges for different applications. In the mining, metallurgical and other industries, there are sieve plates, shakers, etc.; in the machinery industry, there are rubber rollers, tapes, seals, etc.; in the automotive industry, there are tires, seals, etc.; in light industry applications There are polyurethane sole materials, polyurethane synthetic leather, polyurethane fibers; in the construction industry, there are waterproof materials, paving materials, potting materials and so on.
The polyurethane elastomer is firmly bonded to the metal skeleton, and has high bearing capacity, wear resistance and oil resistance. It can be used to manufacture rubber wheels widely used in various transmission mechanisms, such as pulleys for production line conveyors, guide wheels, pulleys for cable cars, and the like. In sports and entertainment, the wheels of high-end skates roller skates and scooters are made of polyurethane. Polyurethane rubber wheels also have the characteristics of oil resistance, good toughness and strong adhesion. They are very effective in mining monorail cranes, rack cars and cleaning vehicles. Polyurethane is also used in small electronic and precision instrument transmission wheels, various universal wheels and the like. The use of PU elastomeric liners reduces production costs and is used in tile and ceramic production lines to increase production efficiency and yield. The urethane mold can be used to copy various patterns to produce decorative blocks. In the metal mold stamping production, polyurethane elastomer rods, tubes and plate mats are used instead of metal springs as cushioning members. The elasticity is high, the flexibility, the original shrinkage deformation strength is high, and the mold is not damaged.
Coal, metal and non-metal mines are in great demand for non-metallic materials with high wear resistance, high strength and elasticity. Polyurethane elastomer products for use in mines include sieve plates, elastomer linings, conveyor belts, and the like. Others such as cyclone for solid separation, flame-retardant antistatic wear-resistant conveyor belt, solid core wheel for mining monorail crane, combined board for coal mine shotcrete machine, oil seal on 10,000-ton electric wheel dump truck Cold-filled rubber for rings and high-voltage cable sheaths.
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