High-temperature-resistant foamed plastic composition and preparation method thereof

Abstract

The invention provides a high-temperature-resistant foamed plastic composition and a preparation method thereof. The high-temperature-resistant foamed plastic composition comprises 30%-99% of cyanate ester resin, 0%-60% of epoxy resin, 0%-10% of a catalyst, 0.01%-10% of a surface active agent, 0.01%-10% of a foaming agent and 0%-40% of filler. The preparation method provided by the invention comprises the following steps: reacting cyanate ester resin with epoxy resin at a certain temperature to synthesize a prepolymer; adding the surfactant, the foaming agent, the filler and the like into the prepolymer, uniformly mixing, pouring the mixture into a die preheated to a certain temperature to be foamed, and curing, cooling and demoulding to obtain the high-temperature resistant foamed plastic composition. The high-temperature resistant foamed plastic composition prepared by adopting the method disclosed by the invention has excellent heat-resistant performance and mechanical property, and also has good dielectric property, and the requirements of thermal insulation and heat preservation, structural support and microwave absorption at a high temperature of 150 DEG C-200 DEG C are met.

Description

technical field [0001] The invention relates to a high temperature resistant foamed plastic composition and a preparation method thereof. Background technique [0002] Polymer foam is a composite material filled with gas. Due to its low density and light weight, it is often used in thermal insulation, heat insulation, energy absorption and other fields. However, traditional polymer foams, such as polyethylene (PE), polystyrene (PS), polyurethane (PUR), phenolic resin (PF), etc., have been unable to achieve strength, stiffness, chemical and physical stability, and heat resistance. It meets the requirements of special fields such as aviation and aerospace for the performance of foamed plastics. Although polyimide foams (such as PMI, PEI, etc.) have good flame retardancy, high and low temperature resistance, good dielectric properties and mechanical properties, etc., However, the high production cost determines that it is difficult to develop and use on a large scale, so it is...

AI Technical Summary

Problems solved by technology

However, some thermoplastic resins with relatively large molecular weight (such as polyethersulfone, etc.) are difficult to blend with cyanate, especially when the content of thermoplastic resin is high, the viscosity of the blended resin will increase and the processability will deteriorate.

[0005] U.S. Patent US8026292 and European Patent EP2028212 have reported a kind of foaming method of cyanate ester foam, will " water and ethanol generator ", promptly can decompose the compound that produces water or ethanol at certain temperature, as hydrated salt, oxonium compound , siloxane containing OH and OR, etc., mixed with cyanate in different proportions, using the CO produced by the reaction of water and ethanol with cyanate 2 As a foaming agent for foam molding, the foaming temperature can be reduced to between 100°C and 160°C, but this method will produce a large amount of solid inorganic residues during the foaming process, and these solid inorganic residues will seriously affect the cyanic acid. Properties of ester foams, not conducive to the application of cyanate foams

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