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Enclosed type polyurethane curing agent emulsion and preparation method and applications thereof

A polyurethane curing agent, a closed-type technology, used in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve problems such as high cost, inconvenience for users, environmental protection, etc., to solve stability problems, Good water resistance, easy to use effect

Active Publication Date: 2019-06-18
FOSHAN JINGXIN HUIMING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The methods for preparing water-based blocked isocyanate curing agents disclosed in existing patent documents are very limited, and the research on it is not deep enough, and there are two technical problems to be overcome: one is that the solid content of the emulsion is low and the cost is higher; Existing in the form of solution brings inconvenience to users and environmental protection problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] a) Preparation of polyisocyanate prepolymers containing sulfonic acid groups

[0075] In the reactor, mix 140 grams of sulfonate diol (molecular weight is 550, solid content is 70%) with 110 grams of ethyl acetate, stir well and add 300 grams of HDI trimer (solid content is 100%) , raise the temperature to 55-60°C for 2 hours, then add 106.2 grams of HMDI, raise the temperature to 60°C for 1 hour, 70°C for 1 hour, 80°C for 4 hours, and 90°C for 4 hours to measure the NCO percentage of the reactant content, when the NCO decline tends to be stable and close to 14%, stop the reaction;

[0076] b) Preparation of blocked polyisocyanate prepolymer

[0077] Cool down to 50°C, add 190g of methyl ethyl ketone oxime in four times, control the feeding temperature at 50-55°C, finish adding in 2 hours, react at 60-70°C for 1 hour, and react at 75-80°C for 3 hours to obtain sealing Type polyisocyanate prepolymer, that is, a blocked polyurethane curing agent; cool down to 40°C, take...

Embodiment 2

[0085] a) Preparation of polyisocyanate prepolymers containing sulfonic acid groups

[0086] In the reactor, 150 grams of sulfonate dihydric alcohol (molecular weight is 550, and solid content is 70%) is mixed with 80 grams of acetone, after stirring, add 400 grams of TDI prepolymers (the mixture of TDI and trimethylolpropane prepolymer), heated to 55-60°C for 2 hours, then added 120 grams of MDI, reacted at 60°C for 1 hour, 70°C for 1 hour, and 80°C for 3 hours to measure the NCO percentage of the reactant. When the NCO decline tends to be stable and close to 11%, stop the reaction;

[0087] b) Preparation of blocked polyisocyanate prepolymer

[0088] Cool down to 50°C, add 180g of methyl ethyl ketone oxime in four times, control the feeding temperature at 50-55°C, complete the addition in 2 hours, react at 65-70°C for 1.5 hours after adding the materials, and obtain a blocked polyisocyanate prepolymer, namely Closed polyurethane curing agent; the temperature was lowered to...

Embodiment 3

[0097] a) Preparation of polyisocyanate prepolymers containing sulfonic acid groups

[0098] In the reactor, 120 grams of sulfonate glycol (molecular weight is 550, solid content is 70%), 180 grams of methyl acetate are mixed and stirred evenly, add 400 grams of MDI, be heated to 50 ℃ and react for 1 hour, rise to React at 70-75°C for 3 hours. Lower the temperature to 50°C, add 55 grams of trimethylolpropane four times within 2 hours, and lower the temperature in the kettle to 50-55°C for each addition, and react at 60-65°C for 1 hour after adding the materials, 70 After reacting at ~75°C for 2 hours, measure the NCO percentage of the reactant, and stop the reaction when the NCO drops and tends to be stable and close to 10%.

[0099] b) Preparation of blocked polyisocyanate prepolymer

[0100] Cool down to 50°C, add 92 grams of ethanol in four times, control the feeding temperature at 50-55°C, complete the addition within 2 hours, and continue to react at 60-65°C for 2 hours...

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Abstract

The invention discloses an enclosed type polyurethane curing agent emulsion and a preparation method and applications thereof. The enclosed type polyurethane curing agent emulsion is prepared by the following steps: (a) preparing polyisocyanate prepolymer containing a sulfonic acid group; (b) preparing enclosed type polyisocyanate prepolymer; and (c) preparing enclosed type polyurethane curing agent emulsion. The invention also discloses applications of the enclosed type polyurethane curing agent emulsion. The enclosed type polyurethane curing agent emulsion exists in a form of aqueous emulsion and can be individually stored for a long term. The emulsion does not contain any organic solvent, has a high solid content and a high NCO content, can be directly diluted by adding water, and can be stored for a long term after being mixed with aqueous resin containing active hydrogen. The prepared aqueous baking finish and aqueous high temperature glue are convenient to use; and the prepared products have a good waterproof property and high strength.

Description

technical field [0001] The invention relates to a polyurethane curing agent material, in particular to a closed polyurethane curing agent emulsion and its preparation method and application. Background technique [0002] At present, scientific and technical personnel in the field of polyurethane are conducting research on water-based polyurethane curing agents in full swing. Some patent documents have been published, and some new products have entered trial sales, which has played a role in diversifying the original varieties of several multinational companies such as Japan and Germany. Supplement to the application. However, looking at the existing water-based polyurethane curing agents, there is a common problem in their application, that is, they must be dispersed and emulsified with water at a high speed before use, and then mixed with hydroxyl-containing resins, which brings inconvenience to use, and after emulsification The available time of the polyurethane curing ag...

Claims

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Application Information

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IPC IPC(8): C08G18/80C09D175/04C09J175/04
Inventor 周建明刘晓鸿周国豪何绍群
Owner FOSHAN JINGXIN HUIMING TECH CO LTD
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