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Waterborne environment-friendly polyurethane adhesive as well as preparation technology and application thereof

A technology of polyurethane adhesives and polyurethane prepolymers, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of small molecular weight, gap, and restrictions on water-based polyurethane adhesives, etc., to achieve performance improvement and cross-fertilization The effect of increased joint density

Pending Publication Date: 2018-06-19
浙江圣腾胶业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current water-based polyurethane adhesives are mainly one-component polyurethane adhesives, and the formed emulsion is linear thermoplastic polyurethane dispersed in water, with a small molecular weight, which cannot reach the crosslinking density of conventional solvent-based polyurethane adhesives. The performance and storage stability of solvent-based polyurethane adhesives cannot reach the performance of solvent-based polyurethane adhesives, and there is still a certain gap between the overall performance and solvent-based polyurethane adhesives, which restricts the application of water-based polyurethane adhesives.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A water-based environmentally friendly polyurethane adhesive is prepared by the following process, and the steps are as follows:

[0018] Step 1. Preparation of polyurethane prepolymer: 71.28Kg of polycaprolactone diol with a relative molecular mass of 2000 was added to the reaction kettle, heated and melted, the temperature was controlled at 100 ° C and vacuumed for 1.5 hours, and then cooled to 80 -90°C, add 87Kg of toluene isophorone diisocyanate and 0.9Kg of catalyst dibutyltin dilaurate, and polymerize for 2.5 hours to obtain a polyurethane prepolymer;

[0019] Step 2. Chain extension reaction: add 13.4Kg of hydrophilic chain extender 1,4-butanediol-2-sodium sulfonate and 6.0Kg of crosslinking agent trimethyl phosphate into the polyurethane prepolymer for crosslinking Chain extension reaction, the reaction temperature is controlled at 60 ° C, and the reaction time is 1.5 hours;

[0020] Step 3, end-capping reaction: 8.5Kg of sodium bisulfite was added to the react...

Embodiment 2

[0024] A water-based environmentally friendly polyurethane adhesive is prepared by the following process, and the steps are as follows:

[0025] Step 1. Preparation of polyurethane prepolymer: 61.54Kg of polytetrahydrofuran diol with a relative molecular mass of 1000 was added to the reaction kettle, heated to 100°C and vacuumed for 1 hour, then cooled to 80-90°C, added 87.16 Kg of isophorone diisocyanate and 0.9Kg of catalyst dibutyltin dilaurate, polymerized for 2.5 hours to obtain a polyurethane prepolymer;

[0026] Step 2. Chain extension reaction: 2.7Kg of crosslinking agent trimethyl phosphate and 12.54Kg of hydrophilic chain extender dimethylol propionic acid are added to the polyurethane prepolymer to carry out crosslinking chain extension reaction, and the reaction temperature is controlled At 70°C, the reaction time was 2 hours;

[0027] Step 3, end-capping reaction: 16.5Kg of sodium bisulfite was added to the reaction kettle for end-capping reaction, the reaction t...

Embodiment 3

[0031] A water-based environmentally friendly polyurethane adhesive is prepared by the following process, and the steps are as follows:

[0032] Step 1. Preparation of polyurethane prepolymer: 68.3Kg of polyoxypropylene glycol was added to the reaction kettle, heated and melted, the temperature was controlled at 100°C and vacuumed for 1.2 hours, then cooled to 80-90°C, and 87Kg of hexafluoroethylene was added. Methylene diisocyanate and 0.9Kg of catalyst dibutyltin dilaurate, polymerized for 2.5 hours to obtain a polyurethane prepolymer;

[0033] Step 2: Chain extension reaction: 13Kg of hydrophilic chain extender dimethylolpropionic acid and 4.8Kg of crosslinking agent trimethyl phosphate are added to the polyurethane prepolymer for crosslinking chain extension reaction, and the reaction temperature is controlled at 65°C, the reaction time is 1.5 hours;

[0034] Step 3, end-capping reaction: 7.1Kg of sodium bisulfite was added to the reaction kettle for end-capping reaction,...

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PUM

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Abstract

The invention in particular relates to a waterborne environment-friendly polyurethane adhesive as well as a preparation technology and application thereof and belongs to the technical field of adhesives. The adhesive is prepared from the following components in parts by mass: a polyurethane pre-polymer formed by polymerizing 30.77 to 35.64 parts of polyglycol and 43.5 to 43.58 parts of diisocyanate, 0.45 part of a polymerization reaction catalyst, 6.27 to 7.85 parts of a hydrophilic chain-extending agent, 1.35 to 3.45 parts of a crosslinking agent, 3.55 to 10.25 parts of sodium hydrogensulfite, 7.5 parts of acetone and 32.5 to 36.5 parts of de-ionized water, wherein the polymerization reaction catalyst is dibutyltin dilaurate; the hydrophilic chain-extending agent is 1,4-butylene glycol-2-sodium sulfonate or dihydromethyl propionic acid; the crosslinking agent is trimethyl phosphate. According to the waterborne environment-friendly polyurethane adhesive, crosslinking is realized through hydrolysis and condensation of the sodium hydrogensulfite, the crosslinking density of waterborne polyurethane is increased, and properties including water resistance, solvent resistance, storage stability and the like are improved; the environment-friendly performance, the water resistance, the solvent resistance, the storage stability and the like reach product quality indexes required by users.

Description

technical field [0001] The invention belongs to the technical field of adhesives, relates to an adhesive that can be used in the fields of shoemaking, leather goods, furniture, interior decoration of automobiles, packaging materials, etc., in particular to a water-based environment-friendly polyurethane adhesive and its manufacturing process and application. Background technique [0002] Waterborne polyurethane is a polymer material developed by replacing organic solvent with water as a dispersion medium. It is safe, non-toxic and does not pollute the environment, and is called an environmentally friendly product. With the advancement of science and technology and the requirements of human beings for environmental protection, environmentally friendly water-based polyurethane tends to replace solvent-based polyurethane. However, the current water-based polyurethane adhesives are mainly single-component polyurethane adhesives, and the formed emulsion is a linear thermoplastic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/42C08G18/48C08G18/32C08G18/34C08G18/73C08G18/75C08G18/82C08G18/83C08G18/10C08G18/66
CPCC08G18/0823C08G18/0828C08G18/10C08G18/4277C08G18/4825C08G18/4854C08G18/664C08G18/6674C08G18/6692C08G18/73C08G18/755C08G18/82C08G18/831C09J175/06C09J175/08C08G18/3206C08G18/348
Inventor 苏坡
Owner 浙江圣腾胶业股份有限公司
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