Method for preparing phenolic foam containing expanded graphite

Abstract

The invention discloses a method for preparing phenolic foam containing expanded graphite. According to the method, firstly, polyacrylic acid is adopted to modify expanded graphite; secondly, gamma-epoxy propoxy propyl trimethoxy silane is adopted to modify expanded graphite so that silane modified expanded graphite alkene can be prepared; finally, phenolic resin containing expanded graphite is prepared through reaction between phenol and paraformaldehyde, and phenolic foam is further prepared. By means of the method, the defects that the mechanical property of phenolic foam is poor, fragility is large, and dreg falling occurs frequently can be effectively improved, the mechanical property of phenolic foam is improved, and phenolic foam has a wider application prospect range.

Description

technical field

[0001] The invention relates to polymer foam materials, in particular to a method for preparing phenolic resin and phenolic foam by using modified expanded graphite. Background technique

[0002] Phenolic foam is one of the most widely used flame retardant insulation materials. Phenolic foam has many excellent properties, such as high temperature resistance, heat resistance, stable structure, low smoke, and flame retardancy. Phenolic foam has abundant raw materials and simple production process. The cost is low, and the cost of phenolic foam is only two-thirds of that of polyurethane foam. The quality of phenolic foam is light, but its specific strength is large, and its size is relatively stable. It can even be used for a long time at -30°C, and the dimensional change rate at this time is only 1%, and the phenolic foam can be used at a high temperature of 150°C for a long time. Conditions of use. Phenolic foam related products are very versatile and are use...

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