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Water-soluble polyurethane curing agent and preparation method thereof

A water-based polyurethane and curing agent technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of high cost, flammability, explosion, and pollution, and achieve sufficient cross-linking, complete reaction, and simple reaction conditions. Effect

Inactive Publication Date: 2011-05-11
肇庆千江高新材料科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the curing agent in polyurethane coatings contains organic solvents such as xylene, toluene, butyl acetate, and cyclohexanone. The release of solvents in the air pollutes a lot, and the cost is high. Organic solvents are dangerous chemicals during storage, transportation, and use. Flammable and explosive, very unsafe

Method used

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  • Water-soluble polyurethane curing agent and preparation method thereof
  • Water-soluble polyurethane curing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In a tank equipped with a stirrer, thermometer and 2 In the protected four-neck flask, add 180 grams of toluene diisocyanate, 408.9 grams of ethyl acetate and 400 grams of polycarbonate diol, heat up to 40 ° C, and then put 10 grams of trimethylolpropane into the reaction in three batches , and then kept at 70°C for 3 hours, and the weight percentage of NCO was detected. When the solid content was 55%, the temperature was lowered to 43°C, and 0.1 gram of polyethylene glycol was put into the reaction in two batches, and then kept at 58°C for 3 hours ; Add 0.2 g of tri-n-butylphosphine, keep warm at 50°C for 2.5 hours, add 0.8 g of phosphoric acid, stir evenly, cool to 20°C, and discharge.

Embodiment 2

[0046] In a tank equipped with a stirrer, thermometer and 2 In the protected four-neck flask, add 250 grams of toluene diisocyanate, 200.1 grams of ethyl acetate and 305.1 grams of polycarbonate diol, heat up to 50 ° C, and then put 50 grams of trihydroxymethylpropane into three batches of reaction, Then keep it at 80°C for 5 hours, detect the weight percentage of NCO, when the solid content is 65%, cool down to 48°C, put 200 grams of polyethylene glycol into the reaction in two batches, and then keep it at 63°C for 3 hours; Add 1 gram of tri-n-butylphosphine, keep warm at 60°C for 4 hours, add 4 grams of phosphoric acid, stir evenly, cool to 30°C, and discharge.

Embodiment 3

[0048] In a tank equipped with a stirrer, thermometer and 2In the protected four-neck flask, add 190 grams of toluene diisocyanate, 250 grams of acetone and 128 grams of polycarbonate diol, heat up to 45 ° C, and then put 30 grams of trimethylolpropane into three batches of reaction, and then in Incubate at 75°C for 4 hours, detect the weight percentage of NCO, when the solid content is 60%, cool down to 45°C, put 400 grams of polyethylene glycol into the reaction in two batches, and then keep at 60°C for 3 hours; add 1 gram of tri-n-butylphosphine, heat-preserve at 55°C for 3 hours, add 1 gram of phosphoric acid, stir evenly, cool to 25°C, and discharge.

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Abstract

The invention discloses a water-soluble polyurethane curing agent and a preparation method thereof. The curing agent comprises toluene diisocyanate, trimethylolpropane, polyethylene glycol, polycarbonate diols, acetic ether and a catalyst. The preparation method comprises the following steps: adding 18-25% of toluene diisocyanate, 20.01-80% of acetic ether and 0.01-40% of polycarbonate diols, adding 1-5% of trimethylopropane for reaction in three batches, adding 0.01-40% of polyethylene glycol for reaction in two batches, and then keeping the temperature at 58-63 DEG C for 3 hours; and adding 0.1-0.5% of catalyst, reacting for 2.5-4 hours while the temperature is kept at 50-60 DEG C, cooling until the temperature is reduced to 20-30 DEG C, and discharging. According to the invention, the preparation method is simple, and the curing agent prepared by utilizing the method can react with water-soluble acrylic resins or water-soluble alkyd resins to form a film when being mixed with the water-soluble acrylic resins and water-soluble alkyd resins. Thus, the curing agent is not only applicable to curing at normal temperature but also applicable to preparation of high temperature curing paints.

Description

technical field [0001] The invention relates to a curing agent in polyurethane paint and a preparation method of the curing agent for polyurethane paint. Background technique [0002] Polyurethane coatings are known for their outstanding performance, excellent protection, and excellent low temperature resistance and construction convenience. It is widely used in military, industrial, home office decoration and protection. In recent years, polyurethane coatings have become increasingly prominent in the coatings industry. Especially in wood coatings, polyurethane coatings play an irreplaceable role, and the choice of its curing agent plays a role in determining the material. Its application and development have attracted much attention. Curing agent, also known as hardening agent, curing agent or stabilizer, is a kind of substance or mixture that promotes or controls the curing reaction. Resin curing is through chemical reactions such as condensation, ring closure, addition...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/44C09D7/12C09D175/04C09D175/08C09D175/14
Inventor 李会宁廖玉陈仕箐
Owner 肇庆千江高新材料科技股份公司
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