New requirements for polyurethane materials in the development of the automotive industry (3)

The door pillar trim panel material is made of PP and PPO. Considering the cost of the tool material, the PP material with high flow, high rigidity and impact resistance in the future has certain advantages. The color of the decorative surface of the door pillar must match the overall color of the car. It requires anti-static, scratch-resistant and beautiful appearance. Therefore, the development of vacuum forming or hot-pressing production technology for acrylic sheet and surface decoration material can satisfy the car with a large batch size. Production needs.

(2) Polyurethane foam for sealing

There are some rectangular soft polyurethane foam sealing blocks in the car's heating air conditioning system, instrument panel assembly, electrical parts or other parts. The body A, B column cavity foam casting, and some use shock absorbing expansion film to reduce the body vibration and noise.

(3) Microporous polyurethane is used as the floor cushion

Microporous polyurethane foams are expected to replace rubber materials in most body bodies as underbody cushions. North American car manufacturers are working hard to make cars quieter and more comfortable. The cushion is mounted on the chassis of the vehicle to isolate the body and frame to improve ride and driving quality. Microporous polyurethane is a unique innovative material for sound insulation and vibration absorbing (NVH).

As a substitute for rubber car body assembly, microporous polyurethane has a competitive price, can effectively improve shock absorption performance, extend material performance retention time, reduce quality, and improve assembly process. Another advantage of using microporous polyurethane is that by changing the material density, it is convenient to optimize the chassis anti-vibration pad, rather than having to adjust the material production recipe or product geometry as in conventional processes. The latter needs to be prototyped, which is costly and time consuming.

Low-foaming PVC material + PU foaming material + porous material This composite structure is mostly used on light passenger cars. The low-foaming PVC material is shaped by vacuum blistering, partially filled with foamed PU material, and partially adhered to the back. material. The structure is both elastic and relatively scratchy and has good foot, sound and heat insulation properties.

Second, the refrigerated truck insulation layer

In order to effectively ensure the sound insulation and heat insulation effect of the car interior, in addition to the rigid polyurethane foam in the middle of the refrigerated truck, the van also uses on-site foaming to expand the rigid polyurethane foam. Application - On-site spraying of rigid polyurethane foam on the top and sides of the body, and bonding with the inner and outer skins of the body to take an organic whole, thus effectively improving the insulation, insulation and sealing performance of the car body To prevent body corrosion, reduce vehicle body vibration, and reduce interior noise. The estimated amount of each car is around 20kg.

The engine heat shield made of rigid polyurethane foam is made of polyurethane foam, glass fiber felt, nylon fabric layer or aluminum film composite, which has the characteristics of light weight and good heat insulation.

The application of glass fiber reinforced polyurethane foam in automobile manufacturing is also gradually expanding, such as automotive interior top interior parts, and the roof interior is made of textile plus glass fiber reinforced PU. For example, the wheel cover mud plate, the oil pan file mud plate and other parts are light and thin, the shape is complex, the process requirements are high, and the anti-stone splash, impact resistance and high and low temperature performance are required.

Third, thermoplastic polyurethane elastomer

1. Thermoplastic polyurethane elastomer and its characteristics

Although the proportion of polyurethane elastomer in the whole polyurethane industry is not large, its brand name and wide application range are comparable to other polyurethanes. Thermoplastic polyurethane elastomer (TPU) is the fastest growing in polycondensation, casting, and thermoplastic class 3 polyurethane elastomers. At present, the current status and development trend of the domestic TPU industry is: the high-end product market is basically controlled by countries such as Europe, America, Japan and South Korea and Taiwan. The domestic TPU production plant can only supply some low-end products and versatile varieties, but the domestic TPU industry is It shows a vigorous development momentum and there is huge room for development in the future. Castable polyurethane elastomer (CPU) is the most widely used, it is a kind of liquid rubber with a wide range of applications, accounting for about 60% of the total output of polyurethane elastomer, but not much used in automobiles. The production of the compounded polyurethane elastomer (HPU) is the smallest, accounting for only about 10% of the total output of the polyurethane elastomer. The biggest advantage is that it can be formed by rubber machining, and it is easy to add a filler such as carbon black. It is growing at an annual rate of around 10%. However, in general, its physical and mechanical properties are not as good as those of the CPU, and the hardness adjustment range is also narrow.

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