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In-situ polymerization preparation method of thermoplastic polyimide prepreg monomer

A polyimide and in-situ polymerization technology is applied in the field of thermoplastic resin-based composite materials, which can solve the problems of difficulty in impregnating fibers, high molecular weight of polymers, and difficulty in removing high-boiling solvents, and achieves low comprehensive preparation cost and simple preparation process. , eliminating the effect of the synthesis process

Pending Publication Date: 2022-04-15
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation process of thermoplastic resin prepregs is currently mainly prepared from thermoplastic polymers as raw materials. The main preparation processes include: (1) solution method: dissolving thermoplastic polymers in a suitable solvent to impregnate fiber reinforcements, Then high-temperature drying to remove the solvent to obtain thermoplastic prepregs. The main disadvantages of this method are that it is difficult to completely remove high-boiling point solvents, which affects the internal quality of molding composite materials, and second, it is difficult to find suitable solvents for most high-performance thermoplastic resins; (2) Powder method: including electrostatic powder method, fluidized bed powder method and powder slurry. This type of method requires high temperature heating to melt and impregnate reinforcing materials, especially the slurry method also needs to remove water as a dispersion medium and disperse thermoplastic powder. (3) Extrusion impregnation method: Extrude thermoplastic resin melt through extruder to impregnate reinforcing material, the extrusion temperature is high, even higher than the composite material molding temperature; (4) Film method: put The thermoplastic resin is prepared as a thermoplastic resin film, and then compounded with a reinforcing material, heated and pressurized to impregnate the reinforcing material; (5) fiber mixing method: the thermoplastic resin is spun to prepare a thermoplastic resin fiber, and then mixed with the reinforcing fiber or blended to form a reinforced fiber. Fabrics of fibers and resin fibers as "prepregs"
[0004] The traditional thermoplastic prepreg preparation process requires thermoplastic resin polymers as raw materials. The polymer has a large molecular weight and high melt viscosity, and it is difficult to impregnate fibers. Thermoplastic resins will experience multiple melting process heat history in the whole process of composite material preparation. At the same time Affect the process performance and service performance of composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] 1. Manual wet method: Add 2mol (1041.0g) of 2,2-bis[4-(3,4-carboxyphenoxy)benzene]propane dianhydride with a purity greater than 99.9% into 2335.0g of absolute ethanol and heat to Dissolve it completely at 78°C, cool to room temperature, add 2mol (216.3g) m-phenylenediamine, and stir for 20min to form a monomer (including both dianhydride monomer and diamine monomer, the same below) mass concentration (the same below) ) About 35% monomer resin solution. will be 2m 2 The CF8652 carbon fiber fabric was treated at 350°C for 5 minutes, and the monomer resin solution was manually painted on the CF8652 carbon fiber fabric. The mass content of the prepreg monomer (including both dianhydride monomer and diamine monomer, the same below) was 38%. ±2% (hereafter, unless otherwise specified, it is the mass content). After most of the ethanol solvent volatilizes, put it in an oven and heat it to 150°C for 10 minutes. The monomers are polymerized into polyamic acid. The polyamic ac...

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PUM

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Abstract

The invention relates to an in-situ polymerization preparation method of a thermoplastic polyimide prepreg monomer. The thermoplastic polyimide prepreg is prepared by impregnating a reinforcing material with a mixture of a diamine monomer and a dianhydride monomer solution, the impregnated prepreg is heated to complete an amidation polymerization reaction, and a solvent left in the prepreg is removed; and further heating to complete the imidization reaction of the polyamide acid and compact the permeation reinforcing material, and carrying out rolling and other processes to obtain the high-performance thermoplastic polyimide prepreg. According to the preparation method, a series of process technical problems caused by high-temperature melt impregnation or solution impregnation of a high-boiling-point solvent required by a traditional thermoplastic prepreg preparation process are effectively solved, and the comprehensive preparation cost and the preparation period of the thermoplastic polyimide prepreg are reduced.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic resin-based composite materials, and in particular relates to a preparation method of thermoplastic polyimide resin-based composite material prepreg. Background technique [0002] Due to the characteristics of good impact resistance and potential short molding process cycle, recyclability, easy repair and low cost, thermoplastic composites have been highly valued by global scientific and engineering research institutions in recent years. The thermoplastic resin matrix of composite materials mainly includes polyether ketone series, polyphenylene sulfide, polyimide, polysulfone and polyether sulfone, etc. The main molding process of thermoplastic composite materials is hot pressing molding process, while thermoplastic resin prepreg is Essential key intermediate material for thermoplastic composites. [0003] The preparation process of thermoplastic resin prepregs is currently mainly prepared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/24C08L79/08
Inventor 包建文姚逸伦孙劲松张朋杨涛董波涛钟翔屿
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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