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Preparation method of water-based polyurethane adhesive

A water-based polyurethane and adhesive technology, used in packaging films, shoe materials, and leather fields, can solve the problems of low solid content, hydrolysis resistance, low cohesive strength, etc., and achieve high bonding strength, good hydrolysis resistance, The effect of high solids content

Active Publication Date: 2012-12-19
广东多正树脂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic high-quality environmentally friendly water-based polyurethane adhesives for shoes are still rare in the market. The main reason is that the solid content is low, and there are still low initial adhesion, slow curing speed, and poor bonding strength to non-polar materials. Disadvantages such as low and poor water resistance
Polyester type waterborne polyurethane has high strength, but is not resistant to hydrolysis; polyether type waterborne polyurethane is resistant to hydrolysis but has low solid content and low cohesive strength

Method used

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  • Preparation method of water-based polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the reaction equipment equipped with stirrer, thermometer and reflux condenser, add 146.14g of adipic acid, 61.03g of neopentyl glycol, 52.81g of 1,4-butanediol, 0.011g of catalyst antimony acetate, heat stabilizer Triphenyl phosphate 0.43g, start stirring, the temperature rises to 120~130°C to completely dissolve the adipic acid; keep refluxing for 1 hour with nitrogen gas to make the dibasic acid and dibasic alcohol interact to form a small molecular polyester; Reaction and dehydration at 150°C, control the temperature of the fractionation head at 100~102°C, gradually increase the temperature in the system to 240°C within 3~4 hours after the water is discharged, the temperature rises first slowly and then quickly; raise the temperature of the material to 240°C for 1 hour, and start Vacuum dehydration, so that the moisture generated by the polycondensation reaction escapes, and remove the small molecule polyester and a small amount of unreacted materials generated in...

Embodiment 2

[0021] 120g of polyester diol prepared by Example 1, 28.95gIPDI, 5.48gHDI are added with stirrer, thermometer, in the reaction device of reflux condenser, add 0.72g dibutyltin dilaurate, heat up after mixing React at 80-85°C for 2 hours, then add 2.32g of dimethylolpropionic acid dissolved in N-methylpyrrolidone NMP, 1.26g of 1,4-butanediol, 1.25g of trimethylolpropane, 0.48g of hydroxyl-terminated silicone oil Chain extension at 80°C, react for 3h, cool down to 35-40°C, add a certain amount of acetone, add 6.14g of 50% aqueous solution of sodium ethylenediaminoethanesulfonate, carry out chain extension at about 40°C for 1h, then add 1.52g of triethylamine was neutralized for 30min. Add the prepolymer to 156g of deionized water for high-speed dispersion and emulsification. The cooling water temperature is below 35°C. Finally, use 0.73g of post-chain extender ethylenediamine to perform chain extension, and distill and remove acetone to obtain a water-based polyurethane emulsion...

Embodiment 3

[0024] 120g is prepared by the polyester glycol of embodiment 1, 35.15gIPDI, 3gHDI is added and agitator is housed, and thermometer, in the reaction device of reflux condenser, add 0.72g dibutyltin dilaurate, heat up to after mixing uniformly React at 80-85°C for 2 hours, then add 1.65g of dimethylolpropionic acid dissolved in N-methylpyrrolidone NMP, 1.1g of 1,4-butanediol, 0.98g of trimethylolpropane, and 0.43g of hydroxyl-terminated silicone oil for chain extension Extend the chain at 80°C, react for 3 hours, cool down to 35-40°C, add a certain amount of acetone, add 8.12g of a 50% aqueous solution of sodium ethylenediaminoethanesulfonate, carry out chain extension at about 40°C for 1 hour, and then add 1.03 g triethylamine for neutralization for 30 minutes. Add the prepolymer to 142g of deionized water for high-speed dispersion and emulsification. The cooling water temperature is below 35°C. Finally, 0.84g of post-chain extender ethylenediamine is used for chain extension,...

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Abstract

The invention discloses a preparation method of a water-based polyurethane adhesive, which is characterized by comprising the following steps: mixing adipic acid and dibasic alcohol according to a certain ratio, and performing esterification reaction and polycondensation reaction in the presence of catalyst and stabilizer to synthesize polyester diol; performing prepolymerization on the obtained polyester diol and diisocyanate, reacting for a certain time, and then adding carboxylic acid type hydrophilic monomer, chain extender, crosslinking agent trimethylolpropane and hydroxyl-terminated silicone oil to perform chain extension; adding acetone, cooling, and then adding aliphatic diamine sulfonate to perform chain extension; performing neutralization, dispersion, emulsification and chain extension, and performing reduced pressure distillation to remove the acetone so as to obtain water-based polyurethane emulsion having a high solid content; and adding leveling agent, thickener, defoaming agent and bactericide into the obtained emulsion to obtain the water-based polyurethane adhesive having a high solid content. According to the invention, the water resistance and the heat resistance of the water-based polyurethane adhesive are improved, and the bonding strength is high, thereby ensuring that the water-based polyurethane adhesive is suitable for bonding on shoe materials and leather.

Description

technical field [0001] The invention relates to the fields of shoe materials, packaging films, leather and the like, in particular to a preparation method of a water-based polyurethane adhesive. Background technique [0002] At present, polyurethane adhesives have been widely used in the shoe industry due to their excellent bonding properties. However, most domestic polyurethane adhesives for shoes are solvent-based, and toxic and harmful organic solvents are likely to cause environmental pollution and damage human life. The environmentally friendly water-based polyurethane adhesive uses water as the dispersion medium, and has the advantages of adjustable hardness, low temperature resistance, good flexibility, flame retardancy, low odor, and no environmental pollution. Considering the human environment and life safety factors, the development and application of environmentally friendly water-based polyurethane adhesives for shoes will surely become the mainstream direction ...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J11/00C08G18/66C08G18/61C08G18/42C08G18/34C08G18/38
Inventor 李树泉许玉良刘传刚罗立奉洪必贵郑李华白云立曾广福曹国豪
Owner 广东多正树脂科技有限公司
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