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Aqueous polyurethane sizing agent and preparation method thereof

A technology of water-based polyurethane and sizing agent, applied in the direction of carbon fiber, etc., can solve the problems of toxic solvent environment, separation of effective components, poor storage stability, etc., and achieve the effects of good adhesion, good mechanical properties, and increased wetting ability

Inactive Publication Date: 2015-11-25
BEIJING GUANGHUA TEXTILE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some carbon fiber sizing agents and their preparation methods involved in Chinese patents have the following problems: (1) Most of them are prepared by external emulsification method by adding various emulsifiers and dispersing solvent-based resins in water. , its storage stability is poor, and the solvent used is toxic and pollutes the environment; (2) the sizing agent emulsion will be diluted to a system with a solid content of less than 5%, which will easily cause the precipitation of active ingredients

Method used

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  • Aqueous polyurethane sizing agent and preparation method thereof
  • Aqueous polyurethane sizing agent and preparation method thereof

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preparation example Construction

[0032] Such as figure 1 Shown, the present invention also provides a kind of preparation method of aqueous polyurethane sizing agent, comprises the steps:

[0033] Step 110: preparing waterborne polyurethane prepolymer;

[0034] The step 110 specifically includes adding 110-135 parts by weight of glycol into the reaction vessel, mixing evenly, vacuuming and dehydrating at 120°C for 20-30 minutes, cooling down to 70-80°C, adding 15-40 parts by weight 1 part of isocyanate reacts with 0-0.01 weight part of catalyst for 3-6 hours, and the temperature is lowered to 40-50 DEG C to obtain a water-based polyurethane prepolymer whose terminal group is a hydroxyl group.

[0035] Step 120: adding deionized water to the water-based polyurethane prepolymer to obtain a water-based polyurethane emulsion;

[0036] The step 120 specifically includes adding deionized water to the water-based polyurethane prepolymer whose end groups are hydroxyl groups under a high-speed stirring shear force o...

Embodiment 1

[0040] In a 500ml four-necked flask equipped with an electric stirrer, a reflux condenser and a thermometer, add 70g parts by weight of polytetrahydrofuran ether glycol and 60g parts by weight of polyethylene glycol, and mix them uniformly. After vacuum dehydration for 30 minutes, cool down to 70°C, add 22g parts by weight of isophorone diisocyanate and 0.005g parts by weight of dibutyltin dilaurate, control the reaction temperature at 70°C, react for 3 hours, and cool down to 50°C. Pour 350 g of deionized water in parts by weight, and disperse under high shear at 1200 r / min to obtain an aqueous polyurethane emulsion.

[0041] Take 50g parts by weight of the above-mentioned water-based polyurethane emulsion, put it into a stirring tank, add 450g parts by weight of deionized water under continuous stirring, and discharge after stirring evenly to obtain a water-based polyurethane sizing agent for carbon fibers (number 1#).

Embodiment 2

[0043] In a 500ml four-necked flask equipped with an electric stirrer, a reflux condenser and a thermometer, add 84.5g parts by weight of polytetrahydrofuran ether glycol and 45.5g parts by weight of polyethylene glycol, and mix them uniformly. After vacuum dehydration for 30 minutes, cool down to 70°C, add 22g parts by weight of isophorone diisocyanate and 0.005g parts by weight of dibutyltin dilaurate, control the reaction temperature at 70°C, react for 3 hours, and cool down to 50°C °C, pour 350 g of deionized water in parts by weight, and disperse under high shear at 1200 r / min to obtain an aqueous polyurethane emulsion.

[0044] Take 50g parts by weight of the above water-based polyurethane emulsion, put it into a stirring tank, add 450g parts by weight of deionized water under continuous stirring, and discharge after stirring evenly to obtain a water-based polyurethane sizing agent for carbon fibers (number 2#).

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Abstract

The present invention relates to the technical field of carbon fiber sizing, and more particularly relates to an aqueous polyurethane sizing agent and a preparation method thereof. The aqueous polyurethane sizing agent comprises the following ingredients by weight: 5-25 parts of aqueous polyurethane emulsion and 75-95 parts of deionized water. The preparation method of the aqueous polyurethane sizing agent comprises the steps of: (1) preparing an aqueous polyurethane prepolymer; (2) adding deionized water to the aqueous polyurethane prepolymer to obtain an aqueous polyurethane emulsion; and (3) adding deionized water into the aqueous polyurethane emulsion by weight ratio, and stirring evenly to obtain an aqueous polyurethane sizing agent. The aqueous polyurethane sizing agent provided by the present invention has good dilution stability, increases the wetting ability of sizing agent for carbon fiber, is more conducive to adhering to the surface of the carbon fiber, so that the carbon composite fiber material shows better mechanical properties.

Description

technical field [0001] The invention relates to the technical field of carbon fiber sizing agents, in particular to a water-based polyurethane sizing agent 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 pultrusion molding process of composite materials, the surface of carbon fiber is prone to hairs, 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, researchers mainly use the method of coating a layer of epoxy emulsion sizing agent on the surface of carbon fiber to increase the bonding strength between carbon fiber and epoxy...

Claims

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Application Information

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IPC IPC(8): D06M15/568C08G18/48D06M101/40
Inventor 马桂玲江四九李新通崔慧妍
Owner BEIJING GUANGHUA TEXTILE GRP
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