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Two-component solvent-free polyurethane adhesive and preparation method thereof

A polyurethane adhesive, solvent-free technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of large limitations, high viscosity of polyurethane adhesives, and affecting the production of flexible packaging bonding effects. Efficiency and other issues, to achieve the effect of increasing contact opportunities, low viscosity, and solving poor adhesion

Pending Publication Date: 2021-11-02
GUANGDONG HERUN PRECISION METAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of the solvent-free polyurethane adhesive prepared from polyester polyol is too high, which has great limitations in practical application and affects the bonding effect and production efficiency of flexible packaging.

Method used

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  • Two-component solvent-free polyurethane adhesive and preparation method thereof
  • Two-component solvent-free polyurethane adhesive and preparation method thereof
  • Two-component solvent-free polyurethane adhesive and preparation method thereof

Examples

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Effect test

preparation example Construction

[0028] The preparation method of above-mentioned a kind of two-component solvent-free polyurethane adhesive comprises the following steps:

[0029] (1) Carry out dehydration treatment on the polyether diol formulated at 110-130°C under reduced pressure, and then add it dropwise to the polyisocyanate at 60-80°C while stirring, and control the dropping time to 0.8-1.2h, Then, under the protection of nitrogen, keep warm for 1.5-2.5 hours, cool to room temperature, and obtain the terminal isocyanate prepolymer of component A;

[0030] (2) Mix the castor oil of the formula quantity with the catalyst, phthalic anhydride, small molecule dibasic acid and small molecule dibasic alcohol, under the protection of nitrogen, heat up to 140-160°C while stirring, and keep the heat for 2.5-3.5h after the reaction, Heat preservation and dehydration for 1-2 hours, then continue to heat up to 200-230°C, keep the temperature of the distillation head below 100°C, keep heat for 2-3 hours, and then c...

Embodiment 1

[0041] A preparation method of a two-component solvent-free polyurethane adhesive, comprising the steps of:

[0042] (1) Carry out dehydration treatment under reduced pressure on the polyether diol PPG1000 of the formulation amount at 120°C, and then add it dropwise to polymethylene polyphenylisocyanate at 70°C while stirring, and control the dropping time to 1h, Then, under the protection of nitrogen, the reaction was kept for 2 hours, cooled to room temperature, and the terminal isocyanate prepolymer of component A was obtained, wherein the molar ratio of polyether diol to polymethylene polyphenyl isocyanate was 4:1;

[0043] (2) Mix the castor oil with the catalyst methanesulfonic acid, phthalic anhydride, adipic acid and neopentyl glycol, under the protection of nitrogen, heat up to 140-160°C while stirring, keep the heat for 3.5 hours, and then dehydrate 2h, then continue to heat up to 210°C, keep the head temperature less than 100°C, keep warm for 3h and then cool to obt...

Embodiment 2

[0046] A preparation method of a two-component solvent-free polyurethane adhesive, comprising the steps of:

[0047] (1) At 120°C, the polyether diol PPG400 of the formulated amount was dehydrated under reduced pressure, and then added dropwise to polymethylene polyphenylisocyanate at 70°C while stirring, and the dropping time was controlled to be 1h. Then, under the protection of nitrogen, the reaction was kept for 2 hours, cooled to room temperature, and the terminal isocyanate prepolymer of component A was obtained, wherein the molar ratio of polyether diol to polymethylene polyphenyl isocyanate was 5:1;

[0048](2) Mix the castor oil in the formula quantity with the catalyst methanesulfonic acid, phthalic anhydride, adipic acid and neopentyl glycol, and under the protection of nitrogen, heat up to 140-160°C while stirring. h, then continue to heat up to 200°C, keep the head temperature less than 100°C, keep warm for 3h and then cool to obtain castor oil modified polyester ...

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Abstract

The invention relates to the technical field of polyurethane adhesives, in particular to a two-component solvent-free polyurethane adhesive and a preparation method thereof. The two-component solvent-free polyurethane adhesive is composed of a component A and a component B according to the mass ratio of 1: 1 to 3: 2. The component A is an isocyanate-terminated prepolymer prepared through a reaction of polyisocyanate and polyether glycol. The component B is castor oil modified polyester polyol prepared by reacting castor oil with phthalic anhydride, small molecular dibasic acid and small molecular dihydric alcohol under the action of a catalyst. The two-component solvent-free polyurethane adhesive has low viscosity, high shear strength and high flame retardant property, and overcomes the defects of poor adhesive strength and poor high temperature resistance of a polyurethane adhesive in a flexible package.

Description

technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a two-component solvent-free polyurethane adhesive and a preparation method thereof. Background technique [0002] In recent years, as an important form of packaging, flexible packaging has achieved unprecedented development in my country's packaging industry. There are currently as many as 5,000 flexible packaging companies in my country, and the production capacity of flexible packaging is also increasing at a rate of 5%. The use of adhesives, which play an important role in flexible packaging, is also increasing day by day. [0003] US Patent US5998538A and Chinese Patent CN102844398A both disclose a method for preparing a solvent-free two-component polyurethane adhesive, and obtain a polyurethane adhesive with high initial bonding ability and high shear strength. However, the viscosity of the solvent-free polyurethane adhesive prepared from polyester polyol is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/42
CPCC09J175/04C08G18/4288
Inventor 刘声泉
Owner GUANGDONG HERUN PRECISION METAL MATERIALS CO LTD
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