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Waterborne polyurethane adhesive with high solid content and preparation method thereof

A water-based polyurethane, high solid content technology, applied in the field of polyurethane, can solve the problems of poor heat resistance, low initial tack, increased cost, etc., and achieve the effect of improving processing performance, high solid content, and high stability

Inactive Publication Date: 2014-04-02
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the water-based polyurethane adhesives produced at this stage have a solid content of 20-40%. The lower solid content leads to greater energy consumption in production and transportation, which increases costs. At the same time, there are low initial adhesion and heat resistance. Disadvantages such as poor sex

Method used

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  • Waterborne polyurethane adhesive with high solid content and preparation method thereof
  • Waterborne polyurethane adhesive with high solid content and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Under a nitrogen atmosphere, 60 parts of poly-1,4-butylene adipate (molecular weight 3000), 40 parts of polyoxypropylene glycol (molecular weight 800), and 30 parts of hexamethylene diisocyanate were added to the reactor, 3 parts of 1,4-butanediol, after fully stirring, add 0.05 parts of dibutyltin dilaurate, raise the temperature to 75°C and stir for 5 hours. Then lower the temperature to 50°C, add an appropriate amount of acetone to reduce the viscosity, then add 2 parts of sodium N-(2-aminoethyl)-aminobutanesulfonate, and stir for 0.5h. Add deionized water under high-speed shearing to obtain a water-based polyurethane dispersion, and finally distill off acetone under reduced pressure to obtain a milky white water-based polyurethane emulsion with a slight blue light.

Embodiment 2

[0028] Under nitrogen atmosphere, 90 parts of poly-1,4-butylene adipate (molecular weight 2000), 20 parts of polyoxypropylene glycol (molecular weight 1000), 25 parts of isophorone diisocyanate, 3 parts of Add diethylene glycol into the reactor, stir well, add 0.05 parts of dibutyltin dilaurate, raise the temperature to 85°C and stir for 4 hours. Then lower the temperature to 50°C, add an appropriate amount of acetone to reduce the viscosity, then add 2 parts of sodium N-(2-aminoethyl)-aminobutanesulfonate, and stir for 0.5h. Add deionized water under high-speed shearing to obtain a water-based polyurethane dispersion, and finally distill off acetone under reduced pressure to obtain a milky white water-based polyurethane emulsion with a slight blue light.

Embodiment 3

[0030] Under a nitrogen atmosphere, add 80 parts of polypentylene adipate (molecular weight 3000), 20 parts of polyoxypropylene triol (molecular weight 1000), 25 parts of diphenylmethane diisocyanate, and 2 parts of ethylene glycol into the reactor , after fully stirring, add 0.08 parts of dibutyltin diacetate, raise the temperature to 90°C, and stir for 3.5 hours. Then lower the temperature to 50°C, add an appropriate amount of acetone to reduce the viscosity, then add 2 parts of sodium 1,2-dihydroxy-3-propanesulfonate, and stir for 0.5h. Add deionized water under high-speed shearing to obtain a water-based polyurethane dispersion, and finally distill off acetone under reduced pressure to obtain a milky white water-based polyurethane emulsion with a slight blue light.

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Abstract

The invention discloses a waterborne polyurethane adhesive with high solid content and a preparation method thereof. The method comprises the following steps: adding polyisocyanate to polyester polyol and polyether polyol, which are dewatered in vacuum, and adding a catalyst for chain extension to obtain a polyurethane prepolymer; adding a sulfamate hydrophilic monomer for chain extension to obtain a waterborne polyurethane polymer; adding deionized water to shear at a high speed for dispersion, and removing acetone to obtain an emulsion-type waterborne polyurethane adhesive with high solid content. By adopting composite polyols, on one hand, good compatibility of a soft segment and a hard segment of polyurethane is ensured, and on the other hand, the flexibility of a polyurethane chain segment is ensured. By adopting the sulfamate hydrophilic monomer, on one hand, the waterborne polyurethane with high stability, high solid content and high crystallinity can be prepared by a little of hydrophilic monomer on the basis of strong acid and base characteristics of the sulfonate, and on the other hand, the problems of poor water tolerance, poor acid-base resistance and the like of carboxylate polyurethane because that the adding amount of the sulfamate hydrophilic monomer is large, and the sulfamate hydrophilic monomer needs to be neutralized by amine are avoided.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a water-based polyurethane adhesive with high solid content and a preparation method thereof. Background technique [0002] Water-based polyurethane (PU) is a new polyurethane system with water as the dispersion medium. It has excellent adhesive properties, mechanical properties, wear resistance and aging resistance, and is non-flammable, non-toxic, and environmentally friendly. It is widely used in adhesives. Adhesives, coatings, leather finishing agents, fabric finishing agents and other fields. Among them, water-based adhesive is one of the main application fields of water-based polyurethane, mainly used in shoemaking, construction, automobile, food packaging and other industries. [0003] The synthesis methods of waterborne polyurethane mainly include acetone method, prepolymer method, melt dispersion polycondensation method, ketimine / ketazine method, etc. Among them, the acetone...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J175/08C08G18/66C08G18/42C08G18/48C08G18/32C08G18/12
Inventor 雷瑞郑化安李国法孙欣新袁聪付东升
Owner SHAANXI COAL & CHEM TECH INST
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