Thermoplastic polyurethane elastomers have the following main features in terms of performance and processing:

Advantages: a, wear resistance is the largest among all types of TPE; b, high strength, high toughness, high transparency; c, fatigue resistance, cold resistance and oil resistance; d, environmentally friendly and non-toxic Recycling, can be used for medical equipment;

Disadvantages: a, heat resistance is generally; b, weathering (ultraviolet light) is insufficient (addition of UV stabilizer can be added); c, finished product residual stress, easy to stick mold.

2. Application of thermoplastic polyurethane elastomer in the automotive industry

Polyurethane elastomers have excellent properties (such as good elasticity, abrasion resistance, fatigue resistance, grease resistance, low temperature flexibility, radiation resistance) and excellent processing properties, and have been widely used in the rapidly developing automotive industry, such as bumpers, Dashboard, in-vehicle cable covering, rear window, door and window seals, shifting knobs, oil seals, vibration damping pads, automotive thin-wall tanks and automotive snow tire anti-skid products.

The most commonly used on automotive parts is the TPU with a hardness of A65-A90, and the market prospect is very broad. The TPU of the domestic Shaw A65 is rarely seen. Generally, there are no brands (not available in the product introduction, but not produced). Domestic related companies can only produce products with higher hardness.

Only the United States GLS company uses the raw materials of BASF of Germany to produce and develop a series of high-performance thermoplastic polyurethane masterbatch and alloy. The Shore hardness range of the product is A45~A65. Thermoplastic polyurethane masterbatches and alloys are suitable for extrusion, injection molding, and coating. The masterbatch modification can improve the hardness, elasticity, elongation and melting point of the alloy, and the product has the properties of thermoplastic rubber (TRP), thermoplastic vulcanizate (TPV) and pure thermoplastic polyurethane. It has liquid crystal, electrical conductivity, oil resistance and chemical resistance. Performance. Compared with conventional thermoplastic polyurethane, it is easier to process and convenient to transport raw materials, and the price is similar to that of conventional thermoplastic polyurethane.

TPU wear-resistant protective coating for automotive compartments, interior vibration-damping coatings, automotive fan flat wire and cable insulation and protective layers have been applied in Europe. The rapid increase in the production of cars in China will drive the use of TPU in the automotive industry at a rate of @)%.

3. Polyurethane potting material for automobile ignition coil

Dry ignition coils are the development direction of automotive ignition coils. The encapsulation process of the coil is divided into hard potting and soft potting. Soft encapsulation adopts elastic polyurethane as potting material. The packaged ignition coil has excellent adaptability to environment, anti-vibration performance and cold-heat cycle resistance, and can better meet the requirements of high-performance development of automotive ignition coils. . In the early 1990s, developed countries such as the United States have used elastic polyurethanes to package automotive ignition coils. For example, the polyurethane potting material of EPIC Company of the United States is a potting material with excellent performance. It has small viscosity, long service life, elasticity of cured product, excellent electrical performance and resistance to cold and heat cycle, especially excellent in high temperature resistance. .

4. Research and application status of polyurethane tires

As early as the 1960s, the use of polyurethane elastomers for tires began. Compared with rubber, polyurethane elastomers have excellent wear resistance, medium resistance and high tear strength. In addition, the production process is simple, the investment is small, and the used tires are easy to recycle, so it is an ideal material for tire manufacturing. The tires are manufactured by a casting process, and the structure is very different from the rubber tires currently produced. The polyurethane tires generally have better uniformity and no tread peeling. Foreign tires made of polyurethane hard foam as the center part of the rim and polyurethane elastomer as the spoke have begun practical experiments. The tire does not need to be inflated and the rolling resistance is reduced by 5%.

The high temperature resistance is not the main reason that affects the practical use of polyurethane tires. During the braking process, due to the rapid accumulation of heat and high temperature rise when the tire tread rubs against the road surface, the tire performance is rapidly degraded (the wear resistance and tear strength at 100 ° C is only about 20% at room temperature) . The high content of urethane in polyurethane may be the main reason for the poor high temperature performance of polyurethane tires. A better solution is to use trimeric isocyanate as raw material, so that the polyurethane elastomer thus obtained has very high temperature resistance. Well, it is usually resistant to high temperatures of 170 ° C, up to 210 ° C, and other physical and mechanical properties such as tear strength, wear resistance, etc. have been improved, so this problem has been basically solved.

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