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A kind of water-based polyurethane adhesive with high solid content for shoes and preparation method thereof

A water-based polyurethane, high solid content technology, applied in the preparation of sulfonates, organic chemistry, etc., can solve the problems of difficult to control reaction speed, difficult to increase solid content, same activity, etc., to achieve easier control of reaction speed, short drying time, The effect of fast solvent evaporation

Inactive Publication Date: 2016-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based polyurethane emulsion synthesized by carboxylate-type hydrophilic monomer alone has a high viscosity, and the solid content is difficult to increase (about 35%); the water-based polyurethane emulsion prepared by using sulfonate-type hydrophilic monomer has high solid content and crystallinity High characteristics, U.S. Patents US-4870129 and US-5432228 use sodium ethylenediaminoethanesulfonate as a hydrophilic chain extender to successfully synthesize a water-based polyurethane adhesive with a solid content of 50%, but it needs to be used during the synthesis process Large amount of organic solvent acetone
The cross-linking monomer in domestic polyurethane synthesis mainly adopts trimethylolpropane, such as CN-102516920, CN-102827571, but the activity of the trimethylolpropane reactive group is the same, the reaction speed is difficult to control, and it is easy to gel, which is not conducive to production

Method used

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  • A kind of water-based polyurethane adhesive with high solid content for shoes and preparation method thereof
  • A kind of water-based polyurethane adhesive with high solid content for shoes and preparation method thereof
  • A kind of water-based polyurethane adhesive with high solid content for shoes and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The dihydric alcohol containing sulfonic acid group used in the embodiment of the present invention, preparation method is as follows:

[0046] In parts by weight, the triethanolamine of 149 parts by weight and sodium isethionate powder of 178 parts by weight are uniformly dissolved in 200 parts by weight of n-decane, and then added to a four-wheel tank equipped with an electric mixer and a serpentine condensing reflux pipe. In the flask, heat up to 210-230°C, add 23 parts by weight of sodium metal, reflux at 220-240°C for 3-4 hours, cool to room temperature, add 50 parts by weight of absolute ethanol to dissolve and filter, and vacuum at -0.1MPa Degree, 140~160 DEG C, vacuum distillation for 2 hours to remove n-decane, absolute ethanol and water, to obtain diols containing sulfonic acid groups, the structural formula of the obtained dibasic alcohols containing sulfonic acid groups is as follows:

[0047]

Embodiment 2

[0049]A water-based polyurethane adhesive with high solid content for shoes, the formula composition and dosage are shown in Table 1, and the specific preparation steps are as follows:

[0050] Add the formulated amount of poly(1,4-butylene adipate) and diol containing sulfonic acid groups into the polymerization reactor equipped with a digital display electric stirrer and a thermometer, raise the temperature to 120°C, and depressurize Distill to remove water, keep warm for 2 hours, cool down to 60-70°C after water removal is complete; add catalysts dibutyltin dilaurate and isophorone diisocyanate to the polymerization reactor, heat up to 85°C, and stir for 3.5 h; then lower the temperature to 70°C, add methyl ethyl ketone, stir for 10 minutes, add 1,4-butanediol, and stir for 3 hours; transfer the reaction product in the polymerization reactor to the dispersion barrel, and set the speed of the high-speed shear mixer to 4500rpm , add deionized water to the dispersion tank for ...

Embodiment 3

[0054] A water-based polyurethane adhesive with high solid content for shoes, the formula composition and dosage are shown in Table 2, and the specific preparation steps are as follows:

[0055] Add the formulated amount of poly-1,4-butylene adipate and diol containing sulfonic acid groups into the polymerization reactor equipped with a digital display electric stirrer and a thermometer, raise the temperature to 125°C, and depressurize Distill to remove water, keep warm for 2 hours, cool down to 60-70°C after the end of water removal; add catalysts dibutyltin dilaurate and isophorone diisocyanate to the polymerization reactor, heat up to 80°C, and stir for 2.5 h; then lower the temperature to 75°C, add butanone, stir for 10 minutes, then add 1,4-butanediol, and stir for 2.5 hours; transfer the reaction product in the polymerization reactor to the dispersion barrel, and set the speed of the high-speed shear mixer 5000rpm, add deionized water into the dispersion tank for shear e...

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Abstract

The invention belongs to the technical field of water-based polyurethane adhesive and discloses water-based polyurethane adhesive with high solid content for shoes and a preparation method thereof. The preparation method of the water-based polyurethane adhesive with high solid content for the shoes comprises the following steps: firstly synthesizing dihydric alcohol containing a sulfonic acid group for later use; then adding polyester polyol and dihydric alcohol containing the sulfonic acid group into an airtight reactor, heating up and carrying out reduced pressure distillation to remove water, then adding polyisocyanate and a catalyst, stirring for reaction; cooling, adding a solvent and a chain extender, and continuously reacting; adding water in the obtained reaction products, carrying out high speed shearing and emulsification, and then carrying out chain extension; heating up, and carrying out reduced pressure distillation to remove the solvent; adding auxiliaries such as a defoaming agent and a thickening agent, so that the water-based polyurethane adhesive with high solid content is obtained, wherein the adopted dihydric alcohol containing the sulfonic acid group is hydroxyl-terminated chain extender, reaction speed can be controlled conveniently, and flash polymerization is avoided. The water-based polyurethane adhesive with high solid content for the shoes has almost no residual organic solvent, excellent mechanical properties and good water resistance and heat resistance and can replace solvent type adhesive maturely applied in the current market.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane adhesives, and in particular relates to a water-based polyurethane adhesive with high solid content for shoes and a preparation method thereof. Background technique [0002] my country is a big country in the production, consumption and export of shoes and boots, but it is not a strong country in shoemaking, and its per capita consumption is also low. In 2007, the output was more than 10 billion pairs, and the export was 8.17 billion pairs. The vast majority are glued shoes, basically using solvent-based adhesives, with an annual glue consumption of about 300,000 tons (non-volatile matter fraction <20%). Polyurethane adhesives have the characteristics of low temperature resistance, good flexibility, strong bonding performance, and good flexibility and hardness adjustability, and their usage in the shoemaking industry is increasing year by year. Polyurethane adhesives in the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C08G18/75C08G18/66C08G18/42C08G18/32C08G18/12C07C303/32C07C309/10
Inventor 涂伟萍刘文济王锋
Owner SOUTH CHINA UNIV OF TECH
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