Low-cost flame-retardant polyimide heat insulation foam and preparation method and application thereof

Abstract

The invention discloses low-cost flame-retardant polyimide heat insulation foam and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing a phosphorus-based liquid flame retardant and a polyol surfactant, adding a catalyst, and conducting an ester exchange reaction to synthesize a phosphorus-containing polyol flame retardant; S2, mixing a pyromellitic diester solution, a foam stabilizer, a compound catalyst and a foaming agent to obtain a foaming white material; S3, stirring and mixing the phosphorus-containing polyol flame retardant andisocyanate, and carrying out a room-temperature prepolymerization reaction to obtain a phosphorus-containing foaming black material; S4, stirring and mixing the foaming white material and the foamingblack material to a uniform state at a high speed to obtain foaming slurry; and S5, pouring the foaming slurry into an open mold, carrying out a free foaming molding process to obtain a polyimide foam intermediate, and curing the foam intermediate after the foam intermediate is shaped. The obtained polyimide foam has good flame retardant property and can improve safety performance and heat insulation performance, so that the polyimide foam can be used for preparing a wall heat insulation material.

Description

technical field [0001] The invention relates to the field of polyimide foam materials, in particular to a low-cost flame-retardant polyimide heat-insulating foam and its preparation method and application. Background technique [0002] One-step polyimide foam has the advantages of simple production process and short production cycle, and the foaming slurry viscosity of one-step polyimide foam is low, and the weight ratio of white material to black material is close to 1:1, which can be directly Apply polyurethane foam foaming machine to realize industrial production. At the same time, the flame retardancy and safety of one-step polyimide foam are slightly higher than that of polyurethane foam, its density and moisture absorption rate are lower than that of polyurethane foam, its thermal conductivity is similar to that of polyurethane foam, and its applicable minimum and maximum temperatures are both Higher than polyurethane foam, so polyimide foam is an ideal choice to repl...

AI Technical Summary

Problems solved by technology

Instead, it is directly mixed into a mixed solution and then participates in the reaction. Although this can further reduce the material density to a certain extent, it also makes it possible to prepare polyimide foam materials in terms of the safety performance of the adiabatic combustion heat release peak and the performance of thermal insulation. The thermal conductivity of the performance is not ideal

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