High-density hard flame-retardant polyimide foam material and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and relates to a preparation method of a high-density hard flame-retardant polyimide foam material. The preparation method comprises the following steps of: 1) uniformly mixing anhydride, low-molecular-weight alcohol and a surfactant I to obtain a precursor A material; uniformly mixing a catalyst and a foaming agent to obtaina precursor B; 2) mixing and stirring the precursor A and the precursor B to obtain a foaming white material; 3) mixing and stirring isocyanate, a flame retardant and a surfactant II to obtain a foamed black material; 4) mixing a foamed white material and the foamed black material in proportion, stirring the mixture at a high speed, pouring the mixture into a plastic mold, making the mixture standstill, carrying out microwave curing treatment on the product and the mold to obtain a foamed precursor, taking out the foamed precursor from the mold, and curing and shaping the foamed precursor inan oven to obtain a final foam material; According to the high-density hard flame-retardant polyimide foam material and the preparation method, organic solvent is used; and the prepared polyimide foammaterial has the characteristics of high density and tensile strength and excellent flame retardancy.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a high-density rigid flame-retardant polyimide foam material. Background technique [0002] Polyimide foam refers to a type of polymer foam material containing imide rings in its molecular structure. Due to the particularity of its molecular structure and cell structure, it has good flame retardant properties, thermal insulation properties, Sound absorption and noise reduction performance, high and low temperature resistance, mechanical properties, physical and chemical stability, water resistance, hygienic safety, etc. It has broad application prospects in aerospace, ships, petrochemical pipelines, construction, automobiles and rail transit. [0003] At present, the preparation technology of high-end polyimide foam materials is mainly in the hands of some companies in industrialized countries such as Europe and the United States. Th...

AI Technical Summary

Problems solved by technology

In addition, in the traditional method, catalysts are mostly added sequentially, which may lead to uneven distribution of solid catalysts or catalysts with high viscosity, which will lead to severe local reactions in the system and uneven performance of the products produced.

[0005] High-density rigid polyimide foam has the possibility of using polyimide foam as a structural material due to its high compressive strength and energy-absorbing properties. Amine foam, because it is difficult to prepare large batches and large-size foam products by using hot pressing technology, and at the same time, α-BPDA is mainly used to cause high production components, and because it is a closed-cell foam, it also makes it difficult to remove the solvent.