Polymethacrylimide foam with uniform pores and preparation method thereof

Abstract

The invention relates to the field of new material preparation, and concretely relates to polymethacrylimide foam with uniform pores and a preparation method thereof and a product thereof. The methodis capable of mixing (methyl)acrylic acid, (methyl)acrylonitrile, a third comonomer, an initiator, a foaming agent, a crosslinking agent, a nucleating agent, and a zinc-copper-doped high temperature-resistant surfactant, and performing a reaction to obtain a transparent prepolymer; the transparent prepolymer is heat-treated, and the polymethacrylimide foam having uniform pores is obtained. The surfactant used in the method does not affect the reaction, so the original preparation process does not need to be changed, and the method is simple and convenient; different active agent amounts can beselected according to different foaming temperatures, or complex formulation is carried out, the surface tension during foaming can be regulated and controlled to prepare pore sizes with different sizes, and fine and uniform pores can be obtained; the introduction of atoms such as fluorine and silicon can increase the intermolecular force, and the heat resistance of the material can be increasedat a certain extent.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a polymethacrylimide foam with uniform pores and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam is a light-weight, high-strength heat-resistant foam, generally used as the core material of sandwich structure composite materials, which can be cured with fibers, resins, prepregs, etc. , Molding, (high pressure) resin transfer molding and other processes. [0003] CN105085767A discloses a polyacrylimide foam material prepared by using an ester ammonium salt precursor, its preparation method and application. In the invention, during the preparation of polyacrylimide foam prepolymer, the ester ammonium salt precursor of PMR polyimide is added, and the endothermic reaction of amidation is used to prepare the polyacrylimide prepolymer The exothermic reaction of free radical polymerization in the process is matched to achieve the purpose of...

AI Technical Summary

Problems solved by technology

The use of nucleating agents is a relatively common method. Nucleating agents are divided into two types: soluble and insoluble. Soluble nucleating agents generally have a solubility limit and cannot be added in large quantities, so the effect is not significant; although insoluble nucleating agents are not affected by addition The amount is significant, but it often needs to be used with anti-sedimentation agent, which makes the process complicated and increases the cost