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Method for preparing shape memory cyanate ester prepreg

A cyanate ester and prepreg technology, which is applied in the field of preparation of shape memory prepregs for fiber composite materials, can solve the problems of inability to prepare prepregs, poor processability, single structure, etc., and achieve excellent mechanical properties and space resistance Effects of environmental performance, long storage period, and high physical and chemical properties

Inactive Publication Date: 2018-02-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing cyanate ester resin has a single structure, high melting point, poor manufacturability, and cannot prepare prepregs, and provides a preparation method for shape memory cyanate ester prepregs

Method used

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  • Method for preparing shape memory cyanate ester prepreg
  • Method for preparing shape memory cyanate ester prepreg
  • Method for preparing shape memory cyanate ester prepreg

Examples

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specific Embodiment approach 1

[0027] Embodiment 1: This embodiment is a preparation method of shape memory cyanate ester prepreg, which is specifically completed according to the following steps:

[0028] 1. Synthesis of cyanate ester prepolymer: put the cyanate ester monomer in a container, stir at a temperature of 80°C to 250°C until the cyanate ester monomer is completely melted, then add modifier I and polymerization Catalyst, the mass ratio of the modifier I to the cyanate monomer is (0.2~20):100, the mass ratio of the polymerization catalyst to the cyanate monomer is (0.0002~1):100, and in The temperature is 60°C-200°C, stirring and reacting at a constant temperature for 0.25h-10h, and then cooling to room temperature at a cooling rate of 0.5°C / min-5°C / min to obtain a modified cyanate resin prepolymer; the modified Agent Ⅰ is bisphenol A epoxy resin, novolac epoxy resin, p-aminophenol triglycidyl epoxy resin, amino tetrafunctional epoxy resin or bis-horse resin, polyethylene glycol, polyalkylene glyc...

specific Embodiment approach 2

[0039] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the cyanate ester monomer described in step one is bisphenol A cyanate, dicyclopentadiene bisphenol type cyanate, bisphenol F Type cyanate or bisphenol M type cyanate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0040] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, stir at a temperature of 80°C-250°C and a stirring speed of 500r / min-2500r / min until the cyanate body completely melted. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing shape memory cyanate ester prepreg, relates to a method for preparing shape memory prepreg for a fiber composite material, and aims to solve the problemsthat a conventional cyanate ester resin is single in structure, relatively high in melting point and relatively poor in manufacturability and cannot be adopted to prepare prepreg. The method comprises the following steps: I, preparing a modified cyanate ester resin prepolymer; II, preparing a shape memory cyanate ester resin; III, preparing a cyanate ester resin colloid membrane; IV, performing preimpregnation, thereby obtaining the shape memory cyanate ester prepreg, wherein the continuous fiber is a one-way continuous fiber or a fiber fabric. The method has the advantages that not only is the shape memory cyanate ester prepreg successfully prepared from a cyanate ester monomer, but also the cyanate ester prepreg has the characteristic of shape memory, and an appropriate material is provided for preparing high-performance intelligent composite materials. The mehtod is mainly used for preparing shape memory cyanate ester prepreg.

Description

technical field [0001] The invention relates to a preparation method of a shape-memory prepreg for fiber composite materials. Background technique [0002] Cyanate resin (Cyanate resin referred to as CE) is a new type of high-performance resin containing two or more cyanate functional groups (-OCN), which has a high glass transition temperature (240 ° C ~ 280 ° C), low Dielectric constant (2.8~3.2) and dielectric loss (0.002~0.008), high thermal stability and low moisture absorption (<1.5%), these excellent properties make it meet the requirements of structural / functional composite materials in the aerospace field Strict requirements, it is a high-performance matrix resin with good prospects. However, due to the high melting point of the current cyanate ester monomer, the manufacturability is poor, and the cured product is relatively stable due to the presence of a triazine ring with a high degree of crosslinking, and often needs to be modified. Therefore, cyanate resin...

Claims

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Application Information

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IPC IPC(8): C08J5/24C08L79/04C08G73/06
CPCC08G73/0644C08J5/24C08J2379/04
Inventor 冷劲松刘彦菊赵寒星兰鑫刘立武
Owner HARBIN INST OF TECH
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