Preparation method of sulfonic acid type waterborne polyurethane adhesive

Abstract

The invention discloses a preparation method of a sulfonic acid type waterborne polyurethane adhesive. The preparation materials of the sulfonic acid type waterborne polyurethane adhesive comprise the following components in percentage by weight: 75%-89% of polyalcohol, 8.5%-22% of diisocyanate, 0.06%-0.10% of cross-linking agent, 1.0%-3.0% of sulfonate hydrophilic chain extender, 0.08%-0.15% of diamine chain extender, and 0.02%-0.05% of organic tin catalyst, wherein the polyalcohol is polyester polyalcohol or polyether polyalcohol or a mixture of the polyester polyalcohol and the polyether polyalcohol; and the sulfonate hydrophilic chain extender is ethylenediamine-based sodium ethyl sulfonate or 1,2-dyhydroxyl-3-sodium propyl sulfonate. The sulfonic acid type waterborne polyurethane adhesive prepared by the preparation method disclosed by the invention has the characteristics of being high in solid content, low in lowest activation temperature and large in peel strength.

Description

(1) Technical field [0001] The invention relates to a preparation method of a water-based polyurethane adhesive, in particular to a preparation method of a sulfonic acid type water-based polyurethane adhesive. (2) Background technology [0002] my country is a big shoe-making country in the world. At present, the annual output of shoes exceeds 10 billion pairs, and the annual consumption of adhesives required is 180,000 to 260,000 tons. At present, the most used adhesives are solvent-based adhesives. Organic solvents have good swelling properties on substrates such as plastics, leather and rubber, and can make the active ingredients in the adhesive penetrate into the interior of the material, so that the adhesive has good bonding performance; At the same time, the construction time of manual operation can be adjusted according to the volatilization speed of different solvents. There are two types of solvent-based adhesives that are currently used the most, namely neoprene a...

AI Technical Summary

Problems solved by technology

[0005] In order to maintain the storage stability of water-based polyurethane adhesives, currently commercially available water-based polyurethane adhesives must use the hydrophilic chain extender dimethylol propionic acid, but the water-based polyurethane adhesives synthesized with it have low solid content and a high minimum activation temperature. Peel strength is small

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

[0006] Chinese patent document CN101020808A discloses a preparation method of a water-based polyurethane adhesive, which synthesizes a water-based polyurethane adhesive with a wide range of uses through organosilicon modification, but the solid content of the water-based polyurethane adhesive is low, only 40%, and peels off The strongest strength is only 3.0N / 15mm

[0007] Chinese patent document CN101993677A discloses a water-based polyurethane adhesive and its preparation method, the adhesive is non-toxic, environmentally friendly, safe, and the preparation method is simple, can reduce production costs, but does not mention whether its application performance is good

[0008] Chinese patent document CN102827571A discloses a preparation method of water-based polyurethane adhesive. The polyester required for its preparation introduces neopentyl glycol in the synthesis. Hydrophilic monomers and sulfonic acid monomers are chain-extended to prepare water-based polyurethane adhesives. The water-based polyurethane adhesives synthesized by this method have high bonding strength, good water resistance and high solid content, but the minimum activation temperature is not mentioned. The experiment is carried out After repeating, the minimum activation temperature of its water-based polyurethane adhesive was tested. The minimum activation temperature range is 80-90°C, and the cost is high, and the synthesis process steps are relatively cumbersome.

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