The Goodyear Tire & Rubber Company of the United States has achieved certain results in this regard. With the improvement of polyurethane material properties and tire manufacturing processes, mass production of polyurethane tires will become a reality in the near future.
Fourth, polyurethane coating
Polyurethane coatings have the characteristics of rapid solidification at low temperatures, good physical properties and convenient construction. Polyurethane coatings are particularly outstanding in terms of color and gloss retention. They have excellent chemical resistance, excellent weatherability and physical and mechanical properties. The paint film is full of color, leveling and vividness; flexibility and hardness. Moderate, there are comprehensive performance indicators. Both solvent-based and water-based polyurethanes are a superior coating system. Formal due to the durability of polyurethane coatings, it is an ideal choice for end-markets that require extremely high product protection. Two-component polyurethane coatings are not only used in passenger cars, but also in luxury cars.
Polyurethane anti-scratch anti-stone coating has been used for the protection of automobile bodies. MOVAY has developed a new automotive topcoat that is a high solids, one component polyurethane modified polymer that can be used on rigid and flexible automotive substrates with excellent acid, hardness and pigment resistance. Conformity.
In recent years, due to the large use of plastic parts in automobiles, it is required to develop a coating for plastic parts that can match the body. This has given birth to a new field of technology - soft-feel coatings, which have begun to grow in the automotive sector. A new generation of two-component polyurethane coatings has been introduced, which can be rapidly cured at low temperatures and has the advantages of long active period (above 10d) and high solid content (nearly 50%).
The performance requirements of automotive protective film materials are: good toughness, good durability, free from weather and temperature changes, even after exposure to outdoor sunlight, it does not yellow crack after several years; has excellent optical transparency, light transmission The rate is as high as 94%, and the haze level is less than 1%. The protective film can show the true color of the paint.
Polyurethane film used to cover the front edge of automotive hoods, front and rear bumpers, door lower panels, key locks, door lock handles, wheel cover edges, topcoats and other protections (protected from stone strikes, wear, etc.) ) the part. For example, the 0.2 mm thick transparent aliphatic thermoplastic polyurethane film introduced by Avery Dennison Industries of the United States has a very high gloss and matches the bright coating of the car to maintain the appearance of the car. It is said that the US 3M company also has similar products.
Five, car vibration damping auxiliary spring
The auxiliary spring for the front and rear independent suspension dampers of a car is made of a cylindrical tower-shaped microporous polyurethane elastomer (microfoam type). This spring system has a particularly obvious effect on improving vehicle performance. The tensile strength of the spring is ≥20N/mm2, the elongation is ≥300%, and the tear strength is ≥8N/mm2. The spring compressive stress rises very little, and the stress rises obviously until the deformation reaches about 35%. At this time, the deformation increases rapidly to near the maximum value, which satisfies the requirements of the stability of the automobile form and the ride comfort, and greatly improves the use of the damper. life. Some vehicles use air springs with microporous polyurethane elastomer springs to reduce the design volume and improve the driving stability of the vehicle. The microporous polyurethane elastomer for vehicles has NDI type and MDI type according to the type of diisocyanate used, and is a patented product of a foreign company. The main difference between the two is their dynamic performance and static performance. At present, more than 90% of luxury limousines use microcellular polyurethane damping buffers, which have very high compressibility, deformability, excellent mechanical properties and outstanding dynamic fatigue resistance compared with rubber damping cushions. .
Sixth, polyurethane adhesive for automotive
1, windshield glue and structural adhesive
At present, China's cars use 20kg of rubber, 16kg of medium-sized cars and 22kg of heavy-duty vehicles. It is estimated that by 2010, the total demand for various types of adhesives and sealants in China's automobile industry will reach 100,000 tons, of which 1480 tons of polyurethane rubber. The most widely used polyurethane adhesives in automobiles are mainly one-component wet-curing polyurethane sealant for assembly of windshield (front windshield, side windshield and rear window), adhesive for automotive interior parts and FRP. Polyurethane structural adhesives for panel materials have excellent toughness, room temperature curing, high bonding strength, good impact and chemical resistance, wide range of bonding materials, and better adaptability to sports tools such as automobiles. Therefore, polyurethane adhesives have been widely used in automobile manufacturing in the United States, Japan and other countries, and become one of the main rubber types for automobiles.
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