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When the patch is solidified to the automobile exterior, the composite material has both the rigidity of metal material and the toughness of non-metal material, which changes the simple metal characteristics of the automobile exterior and improves the flexural strength, rigidity, impact resistance and damping effect of the automobile exterior obviously. The main reasons are as follows.

 With the stricter and stricter air quality standards in cars, customers have higher and higher requirements for car odor. The odor inside the car is mainly released by harmful substances contained in the parts and interior materials, including plastics, adhesives, damping materials (after curing), leather, rubber, foaming agent, felt and so on. The volatile components such as organic solvents, additives and auxiliaries added to these materials in production and processing are the main sources of odor emission. Reinforcement patches are bonded in welding workshop and solidified in painting workshop. Although it does not belong to interior decoration materials, and does not have direct contact with passengers in the car, energy saving, environmental protection, lightweight is the trend of automobile development. PCMAPE can effectively reduce the thickness of patches and achieve the same reinforcing effect by optimizing the formulation of patches and developing green reinforcing patches. More and more main engine factories begin to pay attention to the odor and VOC of the materials on the car body. Developing green environmental products is also the development trend of the patch. 

The fiberglass cloth, as the covering layer, has strong toughness and tear resistance. When the outer panel of automobile is deformed greatly under the action of external force, the fiberglass can prevent the deformation of the bonding layer, reduce the impact energy and reduce the impact on the outer panel of automobile.