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Preparation method of polyimide composite material for fasteners

A polyimide and composite material technology, which is applied in the field of preparation of polyimide composite materials for fasteners, can solve problems such as high cost and difficult forming and processing, and achieves low porosity, good mechanical properties and stable performance. Effect

Active Publication Date: 2016-08-17
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molding process is difficult and requires processes such as turning, milling, and threading, and the cost is relatively high.

Method used

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  • Preparation method of polyimide composite material for fasteners
  • Preparation method of polyimide composite material for fasteners

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of monoester

[0021] 246g (1.5mol) 5-norbornene-2,3-dicarboxylic anhydride was heated to reflux at 69°C to 90°C in 259g ethanol for 2 hours to prepare 5-norbornene-2,3-dicarboxylic acid monoethyl ester (NE ).

[0022] 286g (1mol) 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride reacted in 256g ethanol with reflux at 69~90°C for 5 hours to prepare 2,3,3',4'-diphenyl ether tetra Monoethyl formate.

[0023] 3,3',4,4'- Bisphenol A diphenyl ether tetracarboxylate monoethyl ester.

[0024] (2) Preparation of polyimide matrix resin

[0025] Dissolve 400g (2mol) of 4,4'-diaminodiphenyl ether in 358g of ethanol and stir for half an hour, then add the above-prepared 2,3,3',4'-diphenyl ether tetracarboxylate monoethyl ester and 3, 3',4,4'-bisphenol A diphenyl ether tetracarboxylate monoethyl ester mixture, after stirring for 1 to 2 hours, and 5-norbornene-2,3-dicarboxylic acid monoethyl ester (NE) at 70 ℃ ~ 83 ℃ stirring reaction for 5 hours to obtain a ...

Embodiment 2

[0033] Except that the dosage of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride is 1mol, and the dosage of 3,3',4,4'-bisphenol A diphenyl ether tetracarboxylic dianhydride is 0.6mol, polyamide The imine matrix resin solution is prepared by mixing 5-norbornene-2,3-dioic acid monoethyl ester, 2,3,3',4'-diphenyl ether tetracarboxylic acid monoethyl ester and 3,3',4, The ethanol solution of 4'-bisphenol A tetracarboxylic acid monoethyl ester is mixed with the ethanol solution of 4,4'-diaminodiphenyl ether; the organosilicon coupling agent γ-aminopropyltriethoxysilane treated The glass fibers were impregnated in the prepared polyimide matrix resin solution, and the other formulations and operating steps were the same as in Example 1. As a result, the thread bearing capacity was 10KN and the bolt tensile failure force was 2.5KN.

Embodiment 3

[0035] Except that carbon fiber is used instead of glass fiber, other formulations and operating procedures are the same as in Example 1. As a result, the bearing capacity of thread is 13KN, and the tensile breaking force of bolt is 3.1KN.

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Abstract

The invention relates to a preparation method of a polyimide composite material of a fastening piece. The preparation of polyimide matrix resin comprises the processes of firstly, performing esterification reaction on ethanol and mixed aromatic dianhydrides respectively, and adding 4,4'-diaminodiphenyl ether to perform condensation polymerization after anhydride esterification; then, performing an end-capping reaction on 5-norbornene-2,3-dioctyl phthalate mono-ethyl ester to generate an oligomer, and performing soaking kneading on the oligomer and glass fibers treated by an organic silane coupling agent; and finally, performing heat treatment to prepare a polyimide presoaked material, and performing hot press molding to prepare the needed product. The prepared self-locking fastening piece has the performance that the thread carrying capacity is 11KN and the tensile fracture force is 2.9KN, and the materials comprise 1mol of the mixed aromatic dianhydrodes,1mol of the 4,4'-diaminodiphenyl ether, and 0.25-0.75 mol of 5-norbornadiene 2,3-dimethylbenzene anhydride. During esterification of the materials with ethanol, the mole ratio of anhydride to alcohol is 1:(4-10), the reaction temperature is 69-90 DEG C, and the reaction time is 2-5 hours.

Description

1. Technical field [0001] The invention relates to a method for preparing polyimide composite materials for fasteners, more precisely, esterifying a-ODPA and other dianhydride monomers in an alcohol solution and then adding 4,4'-diaminodiphenyl ether to generate Polycondensation reaction, capping with the same esterified norbornene dioic anhydride, and then impregnating glass fiber or carbon fiber to make polyimide prepreg; finally forming a preparation method of polyimide composite material for fasteners. 2. Background technology [0002] The so-called fastener refers to the general term for the type used to fasten and link two or more parts or components together. Such as bolts, nuts, washers, screws, pins, rivets, etc. The fastener prepared by the polyimide composite material prepared in the present invention refers to a self-locking fastener with threads. Such as bolts, nuts, screws and screws. [0003] 5-norbornene-2,3-dicarboxylic anhydride (NA)-terminated polyimide...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K9/06C08K7/14C08K7/06C08G73/12
CPCC08G73/124C08K7/06C08K7/14C08K9/06C08L79/085
Inventor 王名辉邱孜学包来燕
Owner SHANGHAI PLASTICS RES INST CO LTD