With the rapid development of China's automobile industry and the significant improvement of people's living standards, automobiles have entered thousands of households and become an important means of substitution. At the same time, people put forward higher requirements for the comfort, air quality and low cost of automobile production and use. The common people not only pay attention to the safety of the car, but also pay special attention to the impact of the car on the health of the passengers. Compared with the traditional NVH damping material, the NBR environmental friendly and flame retardant damping material developed by putsmier company pays more attention to the environmental protection performance and noise reduction effect of the product, comprehensively improving the comprehensive performance of the damping material, and through the Body mode analysis and other means to provide customers with NVH system solutions.
1. Noise sources of vehicles
The main noise of the vehicle in use comes from the engine, transmission system, cooling system, intake system, exhaust pipe, brake, road friction, tire, wind resistance, etc. The secondary noise comes from door opening and closing, front and rear hood opening and closing, and window opening and closing.
3. Application position of damping material in automobile
Damping materials are mainly used in automobile floor, door panel, top cover, spare wheel house, wheel cover, instrument panel, engine cover, skirt and other body parts.
3、 Environmental requirements of automobile damping materials
1. PAHs content limit
PAHs content value of touchable surface materials (classified according to risk analysis results)
2. Limit requirements for toxic and harmful substances
Each automobile factory has made corresponding regulations on the limit value of toxic and harmful substances such as heavy metals, mainly involving the following substances:
3. VOC content requirements
The main engine plants have clear restrictions on the content of benzene and aldehydes. As there is no unified national standard, the standard limits of different automobile plants are slightly different. Nevertheless, the VOC emission of damping materials is strictly regulated,
VOC limit provisions:
4、气味及总碳散发的要求4. Requirements for odor and total carbon emission
According to Hg / t4384-2012 industry standard, odor / min ≤ 4.0 ~ 3.0; total carbon emission ≤ 50 μ g / g;
4、 Application of environmental protection damping material
1. Material characteristics and application cases
The new generation of environmental protection damping materials developed by putsmier company adopts imported butyl rubber cross-linking patented technology and special production process. The products have high technology content, superior environmental protection performance, damping coefficient of 0.4, and low production cost. According to the different positions of damping materials applied to the body, three types of sheet materials, namely hot-melt, magnetic and self-adhesive, can be made respectively. It is the replacement product of ordinary asphalt damping material without changing the existing production and assembly mode of the automobile main engine plant and increasing the production cost of the automobile.
With the gradual improvement of the development level of China's automobile industry, environmental protection, energy saving, comfort and cost reduction will become the main goal of customers, even mandatory regulatory projects. The new generation of green butyl rubber damping noise reduction materials will be the main development direction of China's automobile industry to replace the traditional asphalt damping materials in damping noise reduction.
