Self-emulsifying polyurethanes epoxy sizing agent for carbon fibers and preparation method thereof

A polyurethane-based, self-emulsifying technology, which is applied in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of effective component analysis and poor storage stability, and achieve good mechanical properties, enhanced bonding effect, and good adhesion. Effect

Inactive Publication Date: 2010-09-29
天津碧海蓝天水性高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the following Chinese patent applications: the application number is 200510063352.2 (the name is carbon fiber sizing agent and its preparation method), the application number is 200410064587.9 (the name is a preparation method of nano-SiO2 modified carbon fiber emulsion sizing agent), the application number is 02810272 .X (named sizing agent for carbon fiber, its aqueous dispersion, sizing-treated carbon fiber, sheets using the carbon fiber, and carbon fiber-reinforced composite materials), application number 02813985.2 (named sizing agent for carbon fiber, its water Dis

Method used

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preparation example Construction

[0055] A preparation method of polyurethane epoxy sizing agent for self-emulsifying carbon fiber, comprising the steps of:

[0056] (1) Preparation of self-emulsifying polyurethane epoxy emulsion hydrophilic polyurethane prepolymer: 2 to 10 parts by weight of trifunctional isocyanate, 40 to 50 parts by weight of difunctional isocyanate, 10 to 25 parts by weight of binary Add alcohol, 12-25 parts by weight of small molecule chain extender, 10-30 parts by weight of solvent, and 0.1-0.3 parts by weight of catalyst into the reaction vessel, mix well, and control the temperature at 70-90°C under an inert gas environment to react 3 ~6 hours, lower the temperature to 40~55°C to obtain a prepolymer whose end group is isocyanate group;

[0057] (2) Add 8 to 20 parts by weight of monohydroxy glycidyl compound to the prepolymer whose end group is isocyanate group, and react at a controlled temperature of 60 to 70°C for 1 to 2 hours under an inert gas environment, and then cool down to 40...

Embodiment 1

[0062] Under a nitrogen atmosphere, add 10 parts of hexamethylene diisocyanate trimer, 40 parts of hexamethylene diisocyanate, and 5 parts of polymer with a number average molecular weight of 1000 to a reaction vessel equipped with a stirrer and a reflux condenser. Carbonate diol, 5 parts of polytetrahydrofuran ether diol with a number average molecular weight of 200, 25 parts of dimethylol propionic acid, 20 parts of butanone, and 0.1 part of dibutyltin dilaurate are mixed evenly, and the temperature is controlled 70°C, react for 6 hours, cool down to 55°C, add 15 parts of glycidol, control the temperature at 60°C, react for 1 hour, cool down to 55°C, add 18 parts of triethylamine for neutralization, then pour 400 parts of distilled water Disperse in medium, and remove the solvent in the system by distillation under reduced pressure to obtain self-emulsifying polyurethane epoxy emulsion.

[0063] Take 100 parts by weight of the above polyurethane epoxy emulsion, add it to a s...

Embodiment 2

[0065] Under an argon atmosphere, add 5 parts of isophorone diisocyanate trimer, 50 parts of isophorone diisocyanate, 10 parts of isophorone diisocyanate with a number average molecular weight of 200 Polytetrahydrofuran ether diol, 5 parts of polycarbonate diols with a number average molecular weight of 2000, 20 parts of dimethylol butyric acid, 30 parts of ethyl acetate, and 0.2 parts of cobalt naphthenate are mixed uniformly, and the temperature is controlled at 80 ℃, react for 5 hours, cool down to 55°C, add 15 parts of hydroxyethyl glycidyl ether, control the temperature at 65°C, react for 2 hours, cool down to 55°C, add 15 parts of triethylamine for neutralization, pour 400 parts Disperse in distilled water, and remove the solvent in the system by distillation under reduced pressure to obtain self-emulsifying polyurethane epoxy emulsion.

[0066] Take 150 parts by weight of the above polyurethane-based epoxy emulsion, put it into a stirring tank, add 3 parts of methacrylo...

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PUM

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Abstract

The invention relates to a self-emulsifying polyurethanes epoxy sizing agent for carbon fibers and a preparation method thereof. The sizing agent comprises the following components in part by weight: 10 to 15 parts of self-emulsifying polyurethanes epoxy emulsion, 0.2 to 0.3 part of aid, and 84.7 to 89.8 parts of deionized water. The method for preparing the sizing agent comprises the following steps of: (1) preparing hydrophilic polyurethane prepolymer of the self-emulsifying polyurethanes epoxy emulsion; (2) preparing a prepolymer of which the end group is an epoxy group; (3) adding 6 to 20 parts of neutralizer into the prepolymer of which the end group is an epoxy group for neutralization, pouring the neutralized solution into water for dispersing, and removing the solvent through reduced pressure distillation to obtain the self-emulsifying polyurethanes epoxy emulsion; and (4) adding the aid and the deionized water into the polyurethanes epoxy emulsion in the ratio, and uniformly mixing to obtain the self-emulsifying polyurethanes epoxy sizing agent for the carbon fibers. The self-emulsifying polyurethanes epoxy sizing agent for the carbon fibers and the preparation method thereof have reasonable design. The sizing agent can improve the mechanical property of carbon fiber composite materials, and has excellent dilution stability.

Description

technical field [0001] The invention belongs to the field of carbon fiber sizing agents, in particular to a polyurethane epoxy sizing agent for self-emulsifying carbon fibers and a preparation method thereof. Background technique [0002] Carbon fiber has the characteristics of high strength, high modulus, electrical conductivity, thermal conductivity, high temperature resistance and corrosion resistance. As an important advanced composite material reinforcement, it has a wide range of applications in national defense, aerospace and other fields. However, during the molding process of composite materials, hairs are prone to appear on the surface of carbon fibers, which will affect the bonding with the base resin (mostly epoxy resin), and it is difficult to achieve the effect of strengthening and toughening. At present, people mainly use the method of coating a layer of emulsion type sizing agent on the surface of carbon fiber to increase the bonding strength between carbon f...

Claims

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Application Information

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IPC IPC(8): D06M15/564D06M15/568D06M15/572C08G18/58C08G18/12D06M101/40
Inventor 李春刚鹿秀山刘柏松王传增郭平胜孙鹏苏景丽
Owner 天津碧海蓝天水性高分子材料有限公司
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