Polyurethane main use
Since polyurethanes contain highly polar urethane groups and adjust the ratio of NCO/OH in the formulation, different products of thermoset polyurethanes and thermoplastic polyurethanes can be made. According to its molecular structure, it can be divided into two types: linear type and body type. Due to the different crosslink density, the bulk structure can exhibit hard, soft or intermediate properties, with high strength, high wear resistance and solvent resistance.
In high-speed rail waterproof construction, a coating made of "polyurea material" is usually used. It not only has excellent wear resistance, impact resistance, crack resistance, UV resistance and high and low temperature resistance, but also has high construction efficiency. It can reach the design thickness in one construction and is not affected by ambient temperature and humidity. Rapid surface coating on any curved surface, beveled surface and vertical surface fully meets the demanding requirements of ballastless track, and the main raw material for producing polyurea material is polyurethane. [1]
Depending on the raw materials used, there are products of different nature, generally polyester and polyether. Can be used in the manufacture of plastics, rubber, fiber, rigid and flexible foams, adhesives and coatings. Polyurethane materials can be used in various fields of national life and have a wide range of applications. The following is a brief introduction of some products with a certain representativeness.
Polyurethane foam. Divided into rigid polyurethane foam, semi-rigid polyurethane foam and flexible polyurethane foam. Rigid polyurethane foam is mainly used for building insulation materials, insulation materials (insulation and insulation of pipeline facilities, etc.), household goods (beds for sofas, sofas, refrigerators, air conditioners, etc., and core materials such as surfboards). ), as well as transportation vehicles (cars, airplanes, seat cushions for railway vehicles, ceilings, etc.).
Polyurethane elastomer. Polyurethane elastomers have excellent tensile strength, tear strength, impact resistance, abrasion resistance, weather resistance, hydrolysis resistance, oil resistance and the like. Mainly used as coating materials (such as hoses, gaskets, belts, rollers, gears, pipes, etc.), insulators, soles and solid tires.
Polyurethane waterproof material. The polyurethane waterproof material is quite convenient to be used, and can be mixed at room temperature and coated, and then subjected to normal temperature moisture curing to obtain a waterproof layer having no seam, rubber elasticity and good performance. And easy to repair after damage. Generally used as paving materials, track and field materials, racetracks, park floor materials, insulated window frames, etc.
Polyurethane coating. Polyurethane coatings have strong adhesion, and the coatings have excellent wear resistance, water resistance and chemical resistance. Mainly used in furniture coatings, building materials coatings and industrial printing inks.
Polyurethane adhesive. The adjustment of the properties of the cured product can be achieved by adjusting the ratio of the isocyanate to the polyol to achieve high adhesion to the substrate, excellent water resistance, oil resistance and chemical resistance. Polyurethane adhesives are mainly used in packaging, construction, wood, automotive, footwear and other industries.
Biomedical materials. Polyurethane has excellent biocompatibility and is therefore widely used as a biomedical material. It can be used in the manufacture of artificial cardiac pacemakers, artificial blood vessels, artificial bones, artificial esophagus, artificial kidneys, artificial dialysis membranes, and the like.
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