Method for preparing water polyurethane binder for shoe

A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as slow water volatilization, and achieve less organic solvent consumption and high initial tack. , the effect of excellent adhesive strength and heat resistance

Inactive Publication Date: 2008-02-13
BEIJING CHEM IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to propose a method for preparing a water-based polyurethane adhesive for shoes, to solve the problem that water-based polyurethane has a slow moisture volatilization rate when the solid content is low (less than 40%)

Method used

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preparation example Construction

[0023] The preparation method of the water-based polyurethane adhesive for shoes proposed by the present invention comprises the following steps:

[0024] (1) Mix the first polyol, the second polyol, the third polyol and the fourth polyol with each other, dry under low vacuum at 100°C to 140°C for 1 to 3 hours, and cool down to 70°C to 70°C. 90° C., the mixing mass ratio of the above four polyols is: the first polyol: the second polyol: the third polyol: the fourth polyol=1:0.2~2:0.01~0.2:0~ 0.05, then add isocyanate accounting for 3-20% by mass of the mixture, acetone accounting for 20-80% by mass of the mixture and dibutyltin dilaurate accounting for 0.01-0.001% by mass of the mixture, and react for 2-5 hours, Preparation of polyurethane prepolymer;

[0025] (2) neutralization reaction occurs between the above-prepared prepolymer and triethylamine, and the carboxylate or sulfonate therein is neutralized to form a salt, and the degree of neutralization is 80-120%, and the ne...

Embodiment 1

[0052] (1) Installed with reflux condenser, thermometer, stirrer and N 2 In the four-necked flask at the entrance, add the monomer polyol ethylene glycol, the hydrophilic monomer dimethyl isophthalate-5-sodium sulfonate and tetrabutyl titanate. Wherein, the molar ratio of ethylene glycol and dimethyl isophthalate-5-sodium sulfonate is: ethylene glycol: dimethyl isophthalate-5-sodium sulfonate=1:0.05. Tetrabutyl titanate accounts for 0.01% of the monomer polyol. in N 2 Under the atmosphere, heat up, stir, when temperature reaches 210 ℃, constant temperature reflux 30 minutes, add polybasic acid sebacic acid and be warming up to 200 ℃, wherein, the mol ratio of ethylene glycol and sebacic acid is: ethylene glycol: sebacic acid= 1:0.5. The reaction was carried out at a constant temperature of 210°C for 3 hours, and finally dealcoholization was carried out at 210°C and a pressure of 500 Pa for 60 minutes. The resulting product was a first polyol having a hydroxyl value of 37.4...

Embodiment 2

[0069] (1) Installed with reflux condenser, thermometer, stirrer and N 2 In the four-necked flask at the entrance, the monomer polyol butanediol, the hydrophilic monomer isophthalic acid-5-sodium sulfonate and tetrabutyl titanate are added. Wherein, the molar ratio of butanediol and dimethyl isophthalate-5-sodium sulfonate is: butanediol: dimethyl isophthalate-5-sodium sulfonate=1:0.15. Tetrabutyl titanate accounts for 0.01% of the monomer polyol. in N 2 Under the atmosphere, heat up, stir, when temperature reaches 180 ℃, constant temperature reflux 30 minutes, add adipic acid and be warming up to 200 ℃, wherein, the mol ratio of butanediol and adipic acid is: butanediol: adipic acid=1: 0.8. The reaction was carried out at a constant temperature of 210°C, and after 98% of the theoretical amount of water was finished, dehydration was carried out at 210°C and a pressure of 500Pa for 60 minutes. The resulting product was a first polyol having a hydroxyl value of 52.1 mg potas...

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Abstract

The invention relates to a method for preparing a water polyurethane adhesive applied to shoes, pertaining to the technical field of polymers. A proper amount of first polyatomic alcohol, second polyatomic alcohol, third polyatomic alcohol and fourth polyatomic alcohol are mixed to achieve polyurethane prepolymers; a proper amount of triethylamine is added for neutralization; the prepared polyurethane prepolymers is dispersed into deionized water and added with surface-active agent to achieve water polyurethane dispersoid; a proper amount of ethylene diamine is added into the water polyurethane dispersoid for chain expanding reaction to achieve water polyurethanes; the acetone is removed by vacuum pressure reduction, and finally mixed with antioxidant, ultraviolet absorbent, leveling agent, antifoaming agent, wetting agent, thickening agent and silane coupling agent to achieve the water polyurethane adhesive. The invention provides a simple process, needs a small dosage of organic solvent, the solid content is above 50 percent, the energy consumption of production is relatively low; besides, the adhesive has excellent bonding strength to various shoe materials such as PVC, polyurethane, leather, SBS, canvas, rubber and so on, and the heat-resistance effect is strong.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane adhesive for shoes, belonging to the technical field of shoe-making industry. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, which has the advantages of no pollution, environmental friendliness, storage resistance, safe transportation, no fire hazard, and resource saving. It is widely used in fabric coatings, leather edge oils, adhesives and other fields. In recent years, the research on water-based polyurethane is more active, but the prepared water-based polyurethane generally has a solid content of about 40%. Aqueous resin dispersions have lower solids content. Low-solid content waterborne polyurethane adhesives have the problems of slow water volatilization, many gluing times, and high storage and transportation costs, so the use of waterborne polyurethanes in the shoe industry has been limited. [0003] Japanese Patent No. 28944...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04A43B13/32
Inventor 李正梅钱志国姚晓宁李伟徐新民
Owner BEIJING CHEM IND RES INST
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