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High-temperature rough epoxy resin and preparation method of rapidly formed carbon fiber prepreg thereof

A tough epoxy resin and carbon fiber prepreg technology, applied in the field of carbon fiber composite materials, can solve the problems of poor interface and long molding cycle of carbon fiber composite materials, and achieve the effect of improving strength development rate, shortening molding cycle and improving heat resistance.

Inactive Publication Date: 2018-09-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of epoxy resin being brittle after curing, poor interface with fiber and longer molding cycle of carbon fiber composite material, etc., the present invention realizes environmental protection through a high-temperature tough epoxy resin and its preparation method for rapid prototyping carbon fiber prepreg. Toughening of Oxygen Resin Matrix and Rapid Prototyping of Carbon Fiber Composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Polysiloxane diol (Mw=2000) and isophorone diisocyanate were reacted at 40°C for 6 hours according to the molar ratio -NCO:-OH=3:1, to obtain isocyanate-terminated polyurethane prepolymer; take 10g terminal Polyurethane prepolymer of isocyanate, add 100g of bisphenol A type epoxy and mix evenly, add 0.05g of catalyst 2-phenylimidazole after raising the temperature, continue to drop 20g of isophorone diisocyanate, and raise the temperature to 200 After reacting for 1.5 hours at ℃, a high-temperature tough epoxy resin was obtained, and the tested epoxy value was 0.242.

[0018] Take 30 parts (mass parts, calculated based on the final amount of epoxy resin used as 100 parts, the same below) and knead a composition of liquid bisphenol A epoxy resin with 12 parts of dicyandiamide and urea derivatives to obtain a curing system The masterbatch is mixed evenly with 70 parts of the obtained high-temperature tough epoxy resin at a suitable temperature to obtain a resin system for...

Embodiment 2

[0020] React polyethylene glycol (Mw=1000) with diphenylmethane diisocyanate in molar ratio -NCO:-OH=2:1 at 80°C for 3 hours to obtain isocyanate-terminated polyurethane prepolymer; take 30g of isocyanate-terminated polyurethane Polyurethane prepolymer, add 100g of novolac epoxy and bisphenol F type epoxy composition and mix evenly, add catalyst triethylamine 1g after raising the temperature, continue to add 12g of diphenylmethane diisocyanate dropwise, and raise the temperature after the dropwise addition is completed React at 160°C for 4 hours to obtain a high-temperature tough epoxy resin with a test epoxy value of 0.278.

[0021] Take 45 parts (mass parts, calculated based on the final amount of epoxy resin as 100 parts, the same below) liquid bisphenol A epoxy resin, knead with 9 parts of imidazole and modified fatty amine to obtain a curing system masterbatch, and obtain Mix 55 parts of high-temperature tough epoxy resin uniformly at a suitable temperature to obtain a re...

Embodiment 3

[0023] React polytetramethylene ether glycol (Mw=400) with 4,4'-dicyclohexylmethane diisocyanate at a molar ratio of -NCO:-OH=1.2:1 at 60°C for 4 hours to obtain a polyurethane prepolymer ;Take 50g of polyurethane prepolymer, add 100g of bisphenol AD ​​type epoxy and mix evenly, add catalyst 2-ethyl-4-methylimidazole 0.5g after raising the temperature, continue to drop 4,4'-dicyclohexylmethane After adding 4g of diisocyanate, the temperature was raised to 130°C to react for 6 hours to obtain a high-temperature tough epoxy resin with a test epoxy value of 0.265.

[0024] Take 60 parts (mass parts, calculated based on the final amount of epoxy resin used as 100 parts, the same below) liquid bisphenol A epoxy resin and 20 parts of modified amine and imidazole compositions to obtain a curing system masterbatch , mixed evenly with 40 parts of the obtained high-temperature tough epoxy resin at a suitable temperature to obtain a resin system for prepreg, and prepared a casting body s...

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Abstract

The invention discloses high-temperature rough epoxy resin and a preparation method of a rapidly formed carbon fiber prepreg thereof. The preparation method is characterized by comprising the following steps: preparing a high-temperature rough epoxy resin matrix containing polyurethane soft segments and rigid five-membered rings, synthesizing isocyanate-terminated polyurethane prepolymer from diisocyanate and polyhydric alcohols, and carrying out a ring-opening reaction on the epoxy resin so as to obtain the high-temperature rough epoxy resin matrix; kneading a rapid curing system and a liquidepoxy resin to prepare a curing agent master batch component, and adding the curing agent master batch component into the high-temperature rough epoxy resin to be uniformly mixed so as to obtain a resin system for prepreg; preparing a resin adhesive film according to a hot-melt method, and compounding with carbon fibers or fabrics, thereby obtaining the rapidly formed prepreg. The resin system prepared from the high-temperature rough epoxy resin can realize curing within 5 minutes at 150 DEG C, the glass-transition temperature is high, and the prepared prepreg is excellent in manufacturability, excellent in breaking tenacity, applicable to rapid forming of a composite material, easy for high-temperature demolding and difficult in buckling deformation and can be applied to the field of rapid forming of the carbon fiber composite material on a large scale.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber composite materials, and in particular relates to a high-temperature toughness epoxy resin and a preparation method of a rapid prototyping carbon fiber prepreg. Background technique [0002] Carbon fiber / thermosetting resin composites have high specific strength, high specific modulus, high temperature resistance, and fatigue resistance, and are recognized as the first choice for lightweight materials. However, their long production cycle greatly limits the application of carbon fiber composites in the rapid prototyping field. Scale application. Prepreg compression molding is one of the rapid prototyping processes of carbon fiber composite materials. Rapid prototyping requires a matching resin system to meet short curing time and shorten the molding cycle. On the other hand, the resin matrix must be toughened and modified to improve After curing, the epoxy resin is brittle and has poor inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L75/08C08L63/00C08K7/06C08G18/75C08G18/76C08G18/61C08G18/48C08G18/10
CPCC08G18/10C08G18/4833C08G18/4854C08G18/61C08G18/755C08G18/758C08G18/7671C08L63/00C08L75/04C08L75/08C08L2201/08C08G18/58C08K7/06
Inventor 李刚罗丛叶杨小平李波
Owner BEIJING UNIV OF CHEM TECH
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