| Phenolic resin is a kind of synthetic resin which found early and applied widely, and it can be used as material for molding compound, adhesive, paint, and so on.With the development of industry, the request for it's heat-stability and other quality is increasing. The tendency of phenolic resin composite is to improve it's character by chemical modification.In this paper, boron phenolic resin/nano-SiO2 composite was synthesized in-situ technique based on the preparation of phenolic resin and boron modified phenolic resin. The structure, curing behavior and heat-stability of modified phenolic resin nanocomposite were studied by IR,TEM,SEM and thermoanalysis(TG and DSC). This paper also investigated the mechanism of reaction and variety of nanocomposite. On the basis of this, the article researched the friction and wear properties of braze zone which prepared by modified phenolic resin nanocomposite. The experiments showed that the modified nanoparticle which particle size was distribution 30-300nm could disperse to phenolic resin equably,and the nanoparticle could shorten the time of gelation. The phenolic resin nanocomposite could satisfy the request of friction materials. Compared with ordinary phenolic resin, the nanocomposite improved many performance: the outstanding friction properties, steady friction coefficient, lesser wear rate, the ability of anti-heat fade, and all of this made the nanocomposite become high-powered friction materials.The structure and capability of nanocomposite was analyzed by thermoanalysis and friction analysis. The effect of reaction factors and molar ratio on the structure and performance of nanocomposite was studied. The results showed that the phenolic resin nanocomposite had superior thermostabity and pliability, could increase char yield. Through experiments in the laboratory , the optimum process conditions were defined.
|
PDF Full Text Request