Polyimide resin and preparation method thereof

Abstract

The invention discloses polyimide resin and a preparation method thereof. The polyimide resin is polymer having molecular structural formula as shown in formulation I. The resin employs aromatic dianhydride, aromatic diamine and reactivity blocking agent as raw materials and is prepared by adopting a PMR method. The process of preparing the invention is that the aromatic dianhydride, the aromatic diamine and the reactivity blocking agent are heated, refluxed and mixed so as to prepare resin solution. The polyimide resin matrix of the invention can directly compounded with enhanced body to prepare resin matrix composites, or the resin solution is die processed after heat treatment to obtain resin molded parts. The polyimide resin matrix solution of the invention is characterized by high solid content, low viscosity, good stability of storage, etc., and the resin molded parts and the resin matrix composites prepared has low porosity, excellent heat resistance, and high mechanical property, and have potential applying value in high-technology field such as spaceflight, aviation, space technology, etc. when being taken as light weight, high-temperature resistant structure components or secondary structure components.

Description

technical field [0001] The invention relates to a polyimide resin for preparing resin-based composite materials and a preparation method thereof. Background technique [0002] Resin Matrix Composite (Resin Matrix Composite), also known as Fiber Reinforced Plastics (Fiber Reinforced Plastics), is a relatively mature technology and the most widely used type of composite materials. Raw materials of resin matrix composites, including raw materials and additives of matrix phase and reinforcement phase. The matrix phase material refers to various polymers as a matrix, including thermosetting resins and thermoplastic resins, and the reinforcement phase material refers to various fibers, such as glass fibers, carbon fibers, aramid fibers, high-density polyethylene fibers, etc. [0003] Polyimide resin is a high-performance resin used as a matrix material for high-performance composite materials. In 1972, T.T.Serafini et al. (Thermally Stable Polyimide fromSolutions of Monomeric Re...

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Problems solved by technology

[0005] Chuang et al. (A high TgPMR polyimide composites (DMBZ-15), Journal of Advanced Materials, 33 (4), p33) of NASA in 2001 reported a kind of PMR type polyimide matrix resin (DMBZ-15), the The matrix resin has a high glass transition temperature, and the prepared resin-based composite has excellent bending strength and interlaminar shear strength at high temperature, but its open-hole compressive strength is low and the toughness is not ideal

In 2003, Chuang et al. (6F-polyimides with phenylethylenyl endcap for 315-370°C applications, High Performance Polymers, 15(4), p459.) reported the use of phenylacetylene phthalic anhydride as a capping agent to prepare PMR polyimide resin base Composite materials, composite materials have high toughness and temperature cycle impact resistance, but the upper limit of the service temperature of composite materials is not ideal

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