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Method for preparing performed polymer modified epoxy resin

A technology of epoxy resin and prepolymer, which is applied in the direction of epoxy resin glue, adhesive type, adhesive, etc., can solve problems such as degumming of glued joints, cracking of composite materials, and dimensional instability, and achieve improved bond strength , system shrinkage reduction, the effect of superior performance

Inactive Publication Date: 2011-09-14
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The residual stress in the resin is a potential destructive factor, which makes the interface between the resin and the fiber or the adhesive joint suffer considerable stress when there is no external load, resulting in a decrease in strength and even cracking of the composite material. Instability or degumming of glued joints, etc.

Method used

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Embodiment Construction

[0010] The present invention will be described in detail below in conjunction with examples.

[0011] First synthesize the spiro ring orthocarbonate monomer: weigh 0.1 mol of trihydric alcohol and 0.1 mol of di-n-butyltin oxide, add them together into a 250 ml single-necked bottle, add 150 ml of toluene, install a water separator and a reflux device, Electromagnetic stirring is used to control the temperature of the oil bath at 150°C, and the reaction takes about 12 hours. The amount of water collected in the water separator can be used to estimate whether the reaction is complete. Lower the temperature of the oil bath to room temperature, remove the water separator, install a constant pressure dropping funnel and a reflux device, and install CaCl on the reflux condenser 2 drying tube. Add CS to the funnel 2 8ml was slowly added dropwise into the reaction flask, and the oil bath was slowly heated to 100°C, refluxed for 12hr, and after cooling down to room temperature, the t...

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PUM

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Abstract

The invention provides a method for preparing performed polymer modified epoxy resin. The method comprises the following steps of: undergoing a polymerization reaction on a spiro monomer and a diisocyanate monomer to obtain a low polymer; weighing M (Methane) and MDI (Diphenyl-Methane-Diisocyanate) in a certain molar ratio, adding chloroform for dissolving, stirring, keeping the pressure of the mixed solution of MDI and chloroform constant, reacting, evaporating the chloroform out, drying, preserving heat and extracting unreacted chloroform; and adding TDI (Toluylene Diisocyanate) to synthesize a performed polymer; mixing 77 percent by weight of epoxy resin with 20 percent by weight of performed polymer at room temperature, adding a boron triflouride ethylamine curing agent in an amount accounting for 3 percent of the weight of mixed resin, uniformly stirring, putting the mixture into an ultrasonic cleaner, uniformly mixing for 1 hour, putting the mixture into a vacuum backing oven, and putting the mixture into a baking oven for curing. The expansile performed polymer is added, so that the volume contraction rate of the modified epoxy resin is reduced, the contraction stress is reduced, the internal stress is dispersed uniformly, the shearing strength is improved greatly, and great significance for enhancing the practicability of epoxy resin is achieved.

Description

technical field [0001] The invention relates to a preparation method of epoxy resin, in particular to a preparation method of prepolymer modified epoxy resin. Background technique [0002] Epoxy resin-based composites have been widely used as structural materials to replace steel, aluminum, and other materials. However, in order to meet the special needs of aviation, aerospace, navigation, automobile industry, construction industry, etc., the strength and toughness still need to be improved. In order to meet the increasing needs, people have done a lot of research on composite materials to improve its various properties. The residual stress in the resin is a potential destructive factor, which makes the interface between the resin and the fiber or the adhesive joint suffer considerable stress when there is no external load, resulting in a decrease in strength and even cracking of the composite material. Instability or degumming of glued joints, etc. Use a dilatometer to t...

Claims

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Application Information

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IPC IPC(8): C08G59/20C08G59/50C09J163/00
Inventor 王长松李安东梁兵刘大晨宁志高
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY