Water-dispersible hot melt adhesive and preparation method thereof

A dispersion-type, hot-melt adhesive technology, applied in the direction of adhesives, adhesive types, polymer adhesive additives, etc., can solve the problems of unused mixed alcohol solutions, etc., to achieve strong adhesion, good applicability, The effect of improving the adhesive performance

Pending Publication Date: 2021-08-13
GUANGZHOU HUMAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent 104927747A discloses a preparation method of water-based polyurethane hot melt adhesive. It does not use crosslinking agent, and it does not use mixed alcohol solution. There are also differences in the preparation method. The melting point of the film is 130~ 140°C, not suitable for film substrates with poor heat resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of water-dispersible hot-melt adhesive, comprising the following steps:

[0045] S1. Add 700g of poly(1,4-butylene adipate)diol (molecular weight: 3000) into the reaction kettle, heat up to 130°C and keep it warm for 3 hours to remove water, then cool down to 65°C;

[0046] S2. Add 0.07 g of stannous octoate, 115 g of isophorone diisocyanate, and 131.5 g of hexamethylene diisocyanate, heat up to 80° C., and keep warm for 3 hours;

[0047] S3. Dissolve 37g of 1,4-butanediol and 47.5g of dimethylolpropionic acid in 118g of N-methylpyrrolidone to prepare a mixed alcohol solution, add it to the reaction kettle, heat up to 85°C, and react for 3h;

[0048] S4. Add 300g butanone to lower the viscosity, lower the temperature to 60°C, add 34g triethylamine, and react for 5 minutes;

[0049] S5, under stirring, add 1500g deionized water, disperse evenly;

[0050] S6. Cool down to room temperature, dissolve 16.5g of ethylenediamine in 50g of deionized water ...

Embodiment 2

[0054] A preparation method of water-dispersible hot-melt adhesive, comprising the following steps:

[0055] S1. Add 1400g of poly-1,6-hexanediol adipate (molecular weight: 3000) into the reaction kettle, heat up to 130°C and keep it warm for 3 hours to remove water, then cool down to 70°C;

[0056] S2. Add 0.2 g of bismuth isooctanoate, 288 g of isophorone diisocyanate, and 218 g of hexamethylene diisocyanate, heat up to 80° C., and keep warm for 2.5 hours;

[0057] S3, 3g trimethylolpropane, 47g 1,4-butanediol and 95g dimethylol propionic acid are dissolved in 240g N-methylpyrrolidone to prepare a mixed alcohol solution, and the mixed alcohol solution is added to the reaction kettle, Raise the temperature to 85°C and react for 4h;

[0058] S4. Add 800g methyl ethyl ketone to lower the viscosity, lower the temperature to 60°C, add 50g dimethylethanolamine, and react for 8 minutes;

[0059] S5, under stirring, add 2800g deionized water, disperse evenly;

[0060] S6. Cool do...

Embodiment 3

[0064] A preparation method of water-dispersible hot-melt adhesive, comprising the following steps:

[0065] S1. Add 600g of polytetrahydrofuran ether diol (molecular weight 3000) and 800g of poly(1,6-hexanediol adipate) diol (molecular weight 3000) into the reaction kettle, heat up to 120°C for 3 hours, and then cool down to 75°C;

[0066] S2. Add 0.22 g of bismuth neodecanoate, 346.5 g of isophorone diisocyanate, and 174.4 g of hexamethylene diisocyanate, heat up to 80° C., and keep warm for 3 hours;

[0067] S3. Dissolve 44g of 1,6-hexanediol and 90g of dimethylolpropionic acid in 266g of N-methylpyrrolidone to prepare a mixed alcohol solution, add the mixed alcohol solution to the reactor, heat up to 90°C, and react 4h;

[0068] S4. Add 1000g methyl ethyl ketone to lower the viscosity, lower the temperature to 60°C, add 45g dimethylethanolamine, and react for 8 minutes;

[0069] S5, under stirring, add 3300g deionized water, disperse evenly;

[0070] S6. Cool down to r...

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Abstract

The invention discloses a water-dispersible hot melt adhesive and a preparation method thereof. The water-dispersible hot melt adhesive is prepared from the following raw materials in parts by weight: 0.001-0.005 parts of a catalyst, 0.1-2 parts of an auxiliary agent, 0.05-5 parts of a hydrophilic group cross-linking agent, 0.5-1.2 parts of a neutralizing agent, 1.8-4 parts of a chain extender solution, 4-8 parts of a mixed alcohol solution, 6-10 parts of isocyanate, 8-15 parts of a ketone solvent, 20-30 parts of polyester polyol and/or polyether polyol and 40-50 parts of deionized water. The water-dispersible hot melt adhesive disclosed by the invention is in a liquid state at normal temperature, moderate in viscosity, relatively low in use temperature, capable of completing melt bonding at 90-110 DEG C (the lowest 90 DEG C), strong in bonding force, and good in applicability to some film substrates with relatively poor heat resistance.

Description

technical field [0001] The invention relates to the technical field of hot-melt adhesives, in particular to a water-dispersed hot-melt adhesive and a preparation method thereof. Background technique [0002] As the country's environmental protection requirements become increasingly stringent, hot melt adhesives are widely favored in flexible packaging, decorative materials and other industries due to their strong adhesion and almost no VOC. However, the bonding of hot melt adhesives usually uses high temperature to convert the solid hot melt adhesive into a molten viscous fluid, and then applies mechanical force to coat the surface of the adhesive with a certain process, and completes the bonding after cooling. Among them, the melting temperature is high (120~180°C), which consumes a lot of power, and also limits the use of some heat-sensitive substrates, especially flexible packaging materials (PE, PVC, etc.). In addition, the viscosity of the melted glue is also high, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/04C09J11/06C09J11/08
CPCC09J175/06C09J175/04C09J11/06C09J11/08C08K5/3412C08L79/00C08K5/0091
Inventor 李冠荣沈丽香孔婉仪朱明晶黄艳轶
Owner GUANGZHOU HUMAN CHEM
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