People's environmental protection of the car, comfort, safety, aesthetic requirements are more and more high, the requirements of the car sealing strip is also in constant innovation and improvement. In order to meet the needs of improving the performance and grade of automobile, the development trend of automobile sealing strip industry was analyzed and studied from the aspects of applied materials, product structure and production technology of passenger car sealing strip.

1. Review the development process of automobile sealing strip

In the 1980 s, almost all of the seal is considered to be in order to meet the performance and partial sealing performance, as a result of the limitation of science and technology at that time, seldom consider the decorative, safety and comfort, therefore, when using the bus, can only consider the connection mode, such as the front window and rear window, side window and door seal; The structure is also very simple, mostly using a single species, integrated connection, glass connection; Materials to natural rubber or styrene butadiene rubber, plastic (mainly modified PVC) based. Although this seal accords with connection and some seal performance, but other properties (such as flexibility, heat resistance, water resistance, dustproof, sound insulation, weather resistance, ozone resistance, aging resistance, etc.) is poorer, not to mention beautiful and comfortable, because of the limitation of material itself performance car seal life only 3-5 years, can not match the service life of the bus. The color is also relatively simple (rubber is almost always black), not to mention decorative and beautiful. The tightness of the door, body and trunk is poor, and the noise, dustproof and waterproof effect is also very poor. In the late 1980s, with the continuous improvement of passenger class, the requirements of the cabin also increased accordingly.

2, the use of the bus sealing strip condition

From the 1980s to the present, the automotive industry to the parts industry of the overall performance requirements have been improving, of course, the sealing industry has also had a great development.

(1) Great changes have taken place in the structure of sealing products. (i.e. combination of dense rubber, sponge rubber and steel or nylon skeleton), four kinds of composite materials (i.e. combination of compact rubber and sponge rubber) are compact rubber, sponge rubber and steel or nylon skeleton, flocking four kinds of composite materials.

(2) There have been new developments in the application of materials. Using natural rubber (or styrene-butadiene rubber) and plastics with synthetic strength, heat resistance, weather resistance and anti-aging properties, EPDM has excellent heat resistance, weather resistance and ozone resistance. Due to its excellent properties, the production and sales of EPDM have continued to grow in recent decades.

(3) Production technology bid farewell to the original production technology of pure rubber extrusion steam curing tank vulcanization, adopting more advanced multi-head extrusion microwave vulcanization production technology, and injection molding secondary processing molding technology.