Rubber composition for automobile engine compartment heat insulation pad skeleton layer

Abstract

The invention discloses a rubber composition for an automobile engine compartment heat insulation pad skeleton layer. The rubber composition is prepared from oil-extended EPDM (Ethylene-Propylene-Diene Monomer) rubber, zinc oxide, stearic acid, polyethylene glycol, an anti-aging agent, carbon black N550, carbon black N774, silica powder, paroline, an accelerating agent DTDM (Dithiodimorpholine), an accelerating agent BZ (Benzodiazepine), an accelerating agent DPTT (Dipentamethylenethiuram Tetrasulfide) and an accelerating agent TMTD (Tetramethylthiuram Disulfide). The rubber composition disclosed by the invention is higher in tensile strength, better in hot air aging resistance, low in compression deformation, good in ozone resistance, excellent in low-temperature brittleness and good in low temperature resistance, and the use under a low temperature environment in winter can be met; meanwhile, the wear resistance and warping and fracturing resistance are also very good, the service life of a heat insulation pad is prolonged, the requirements of passengers on comfort and functions of an automobile can be well met, the automobile engine compartment heat insulation pad skeleton layer is arranged at the periphery of an automobile engine, and the automobile engine compartment heat insulation pad skeleton layer has the maximum function of protecting the paint brightness of an automobile engine hood; the rubber composition disclosed by the invention is used for the automobile engine compartment heat insulation pad skeleton layer and has certain sound insulation and heat insulation properties, and noise caused by automobile vibration can be reduced.

Description

technical field [0001] The invention relates to a rubber composition, in particular to a rubber composition used for a skeleton layer of an automobile engine compartment heat insulation pad. Background technique [0002] As we all know, when a motor vehicle is running, the engine emits a lot of heat. The engine compartment cover is located above the engine, and the heat from the engine compartment directly bakes the engine compartment cover upwards. Therefore, after the vehicle has been driving for a long time, the temperature of the cover plate is very high. The temperature of the cover plate is too high, which makes the paint layer easy to soften, and the car is more likely to be damaged by the impact of sand and stones during driving. The acidic substances left after the impact of insects are also more likely to corrode the paint surface, which affects the quality and life of the paint. . [0003] In order to solve the above problems, it is usually necessary to install a...

AI Technical Summary

Problems solved by technology

At present, the commonly used automobile engine compartment heat insulation pad includes two parts, a skeleton layer and a surface layer. The surface layer is usually a common heat insulating material, and the skeleton layer that plays a major role mainly includes two structures: (1) adopt resin powder to add glass fiber material Production, because the engine in the engine compartment will produce a lot of noise and high temperature when it is working, the parts using the above materials are heavy, the sound insulation effect is average, and the glass fiber has a great pollution to the environment

(2) The composite structure of resin powder + cotton fiber is adopted: its weight is heavy, the cost is high, and the process is complicated

In the prior art, the sound insulation and heat insulation effect of the engine compartment heat insulation pad is general, the environmental protection is poor, the cost is high, and the process is complicated, which restricts the development of the automobile engine compartment heat insulation pad.