Preparation method of waterproof straw board for automobile sound absorbing

Abstract

The invention discloses a preparation method of a waterproof straw board for automobile sound absorbing. By mass, after 7 parts of straw stalk and 3 parts of loofah sponge are smashed, mixed and modified, WC-300 isocyanate is taken as an adhesion agent, glue mixing, paving and hot-pressing treatment are conducted, and the waterproof straw board is prepared. Firstly mixed powder of the straw stalk and the loofah sponge is subjected to pre-treatment by using alkali liquor and plasmas, holes and an adsorption specific surface area are increased, because of oxidation of the plasmas, the crystallinity degree is decreased, so that when the treatment that the mixed powder of the straw stalk and the loofah sponge is immersed in an ethanol solution of a silane coupling agent is conducted, the effective contact area of the ethanol solution and a silane modifier is increased, and silanol formed by hydrolyzing of hydroxy on the surface of the mixed powder and the coupling agent conducts condensation polymerization to form hydrogen bonds; and then stable chemical combined bonds are formed through the drying and dehydration effects of microwaves, therefore the surface of the mixed powder is coated with the coupling agent, and the material hydrophily is reduced. The preparation method of the waterproof straw board for automobile sound absorbing is applied to automobile sound absorbing materials and is capable of absorbing sound and resisting shock, high in waterproof strength, good in suitable coating property and even in glue mixing.

Description

technical field [0001] The invention relates to the technical field of straw board preparation, in particular to a preparation method of a waterproof straw board used for sound absorption of automobiles. Background technique [0002] Sound-absorbing materials for automobiles are often porous plates and perforated materials. Foam plastic is a commonly used sound-absorbing material for automobiles, and it is a non-renewable resource. The utilization rate of straw in our country is low, and it is generally burned on the spot, which not only destroys the soil ecology, but also brings environmental pollution due to the thick smoke from burning. If it can be used industrially, it will not only solve the problem of environmental pollution, but also help solve the "three rural" issues. Therefore, Hua Liang et al. used renewable resource rice straw boards to replace sound-absorbing foam plastics for automobiles in the article "New Sound Absorbing Materials for Automobiles-Determina...

AI Technical Summary

Problems solved by technology

[0003] However, the surface of commonly used straws is rich in hydroxyl groups, and these hydroxyl groups make the fibers highly water-absorbing. Long-term exposure to wind and sun as automotive sound-absorbing materials will lead to a decrease in the strength of the straw board and a shortened service life. On the other hand, the prepared The straw board process is too simple, and it is prone to uneven glue mixing when mixing glue. The surface of the finished product is rough and has low adhesion, which is not conducive to the subsequent surface coating process.