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Waterborne polyurethane adhesive used for shoes and preparation method thereof

A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem of poor water resistance of polyester polyols, affecting the service life of water-based polyurethane, and poor low temperature flexibility and other problems, to achieve the effect of improving initial viscosity and bonding strength, strong crystallinity, and outstanding water resistance

Inactive Publication Date: 2019-05-03
耿佃勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technical schemes all adopt polyester polyol or polyester polyol and polyether polyol to compound to prepare water-based polyurethane adhesive with higher solid content and improve the initial tack of polyurethane adhesive, but polyester polyol The water resistance is poor, and the low temperature flexibility is not good, which seriously affects the service life of waterborne polyurethane

Method used

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  • Waterborne polyurethane adhesive used for shoes and preparation method thereof
  • Waterborne polyurethane adhesive used for shoes and preparation method thereof
  • Waterborne polyurethane adhesive used for shoes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix 100 parts of DMD-5000 and 60 parts of polytetrahydrofuran diol, vacuum dehydrate at 90°C for 1.5h, cool down to 50°C, protect with nitrogen, add 25 parts of CHDI and 12 parts of DMPA, and react at 80°C 1.5h, lower the temperature to 50°C, add acetone to adjust the viscosity of the system, and obtain a polyurethane prepolymer;

[0025] (2) add 17 parts of triethylamine and 170 parts of water in the polyurethane prepolymer that step (1) makes, disperse at high speed under the effect of high-speed shearing force, add 11 parts of ethylenediamines and carry out rear chain extension again, finally The acetone is evaporated under reduced pressure to obtain the water-based polyurethane adhesive for shoes.

Embodiment 2

[0027] (1) Mix 100 parts of DMD-5000 and 80 parts of polytetrahydrofuran diol, vacuum dehydrate at 100°C for 2 hours, cool down to 60°C, protect with nitrogen, add 30 parts of CHDI and 19 parts of DMBA, and react at 90°C for 2 hours , lower the temperature to 50°C, add butanone to adjust the viscosity of the system, and obtain a polyurethane prepolymer;

[0028] (2) add 20 parts of triethylamine and 190 parts of water in the polyurethane prepolymer that step (1) makes, disperse at a high speed under the effect of high-speed shearing force, add 15 parts of ethylenediamines and carry out rear chain extension again, finally Evaporate butanone under reduced pressure to obtain water-based polyurethane adhesive for shoes.

Embodiment 3

[0030] (1) Mix 100 parts of DMD-5000 and 70 parts of polytetrahydrofuran diol, vacuum dehydrate at 100°C for 2 hours, cool down to 60°C, protect with nitrogen, add 28 parts of CHDI and 15 parts of DMBA, and react at 90°C for 2 hours , lower the temperature to 50°C, add ethyl acetate to adjust the viscosity of the system, and obtain a polyurethane prepolymer;

[0031] (2) add 18 parts of triethylamine and 180 parts of water in the polyurethane prepolymer that step (1) makes, disperse at a high speed under the effect of high-speed shearing force, add 13 parts of ethylenediamines and carry out rear chain extension again, finally Ethyl acetate is evaporated under reduced pressure to obtain a water-based polyurethane adhesive for shoes.

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Abstract

The invention relates to the technical field of polyurethane adhesives, specifically to a waterborne polyurethane adhesive used for shoes and a preparation method thereof. The waterborne polyurethaneadhesive comprises the following raw materials by mass: 100 parts of polyether polyol A, 60 to 80 parts of polytetrahydrofuran diol, 25 to 30 parts of isocyanate, 12 to 19 parts of a hydrophilic chainextender, 50 to 80 parts of a solvent, 17 to 20 parts of a neutralizing agent, 11 to 15 parts of an amine chain extender and 170 to 190 parts of distilled water, wherein the polyether polyol A is polyether polyol which uses glycerin as a starting agent, uses epoxypropane for ring opening and oxirane for end termination, and has a functionality degree of 2.5 to 3.5 and a number average molecular weight of 4500 to 5500; and the isocyanate is 1,4-cyclohexane diisocyanate. The waterborne polyurethane adhesive provided by the invention has good initial strength and initial adhesion, high bonding strength and good heat resistance and water resistance in the process of use. The invention also provides a preparation method for the waterborne polyurethane adhesive.

Description

technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a water-based polyurethane adhesive for shoes and a preparation method thereof. Background technique [0002] At present, polyurethane adhesives for shoes mainly use traditional solvent-based adhesives, which have strong adhesion and are resistant to hydrolysis. Today, as environmental protection and health are getting more and more attention, foreign shoe-making brands have begun to use more environmentally friendly and healthy water-based adhesives. Adhesives replace traditional adhesives. Water-based adhesives use water as a dispersant, which has the advantages of economy, safety, five poisons, no pollution, and low odor, but it dries slowly, has low initial viscosity, and poor water resistance of film formation. Water-based polyurethane adhesives replace solvent-based polyurethane adhesives, and their performance needs to be further improved. [0003] Ye Jiac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12
Inventor 荆晓东
Owner 耿佃勇
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