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Polyurethane complex film adhesive and preparation method thereof

A laminating adhesive and polyurethane technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low solid content of polyurethane laminating adhesives, poor metal composite adhesion, and poor hydrolysis resistance. , to achieve the effect of good compatibility, good wetting ability and excellent mechanical properties

Active Publication Date: 2015-04-22
WANHUA CHEM BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is to propose a preparation method of polyurethane laminating adhesive, which solves the problems of low solid content, poor wetting, poor hydrolysis resistance, no resistance to heat and humidity, short open period, and Poor adhesion with metal composites and other defects, so as to meet the needs of composites of various structural substrates

Method used

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  • Polyurethane complex film adhesive and preparation method thereof
  • Polyurethane complex film adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Put 20 parts of polyoxypropylene glycol with a hydroxyl value of 280 mg potassium hydroxide per gram, 0.01 part of zinc hexacyanocobaltate tert-butanol double metal complex, and 25 parts of phthalic anhydride into a 3L autoclave . Vacuumize twice and fill with nitrogen to normal pressure. When the temperature rises to 70°C, add propylene oxide. During the reaction, control the temperature at 110°C to 150°C. After adding 55 parts of propylene oxide, the pressure in the kettle is close to The normal pressure reaction was completed, and the whole reaction was polymerized for 4 hours. Then the unreacted propylene oxide was removed under vacuum to obtain the special polyol 1 with a functionality of 2 and a hydroxyl value of 57 mg potassium hydroxide / g.

Embodiment 2

[0046] Put 6.7 parts of trimethylolpropane, 0.015 parts of zinc hexacyanocobaltate ethylene glycol dimethyl ether bimetallic complex, and 40 parts of phthalic anhydride into a 3 L autoclave. Repeat vacuuming twice and fill with nitrogen to normal pressure. When the temperature rises to 70°C, add propylene oxide. During the reaction, control the temperature at 130°C to 180°C. After adding a total of 53.3 parts of propylene oxide, the pressure in the kettle is close to The normal pressure reaction was completed, and the whole reaction was polymerized for 5 hours. Then the unreacted propylene oxide was removed in vacuum to obtain the special polyol 2 with a functionality of 3 and a hydroxyl value of 85 mg potassium hydroxide / g.

Embodiment 3

[0048] Put 40 parts of diethylene glycol adipate with a molecular weight of 400, 0.015 parts of zinc hexacyanocobaltate tert-butanol double metal complex, and 20 parts of succinic anhydride into a 3L autoclave. Vacuumize twice and fill with nitrogen to normal pressure. When the temperature rises to 70°C, add propylene oxide. During the reaction, control the temperature at 110°C to 150°C. After adding a total of 40 parts of propylene oxide, the pressure in the kettle is close to The normal pressure reaction was completed, and the whole reaction was polymerized for 5 hours. Then the unreacted propylene oxide was removed under vacuum to obtain the special polyol 3 with a functionality of 2 and a hydroxyl value of 112 mg potassium hydroxide / g.

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Abstract

The invention relates to a polyurethane complex film adhesive and a preparation method thereof. The polyurethane complex film adhesive comprises a solidifying agent A component and a main agent B component, wherein the solidifying agent A component is an isocyanate-terminated prepolymer obtained by reacting polyisocyanate with polyalcohol a; the main agent B component is a polyhydroxylated compound prepared by reacting special polyalcohol, epoxy resin and polyalcohol b with polyisocyanate; the mole ratio of the functional groups of the A and B components is NCO:OH=(1.0-2.0):1. The process for preparing the polyurethane complex film adhesive is simple; the prepared product has the advantages of high initial viscosity, good wetting property on a base material, good hydrolysis resistant stability, wetness and heat resistance, long opening time, good compatibility, high adhesive force on metals, chemical resistance, good compound flexible package appearance and high stripping strength, can be used for series complex films with generality, high solid content, solvent-less lamination, and the like and overcomes the defects of low solid content, poor wetness, poor hydrolysis resistance, no wetness and heat resistance, short opening period, poor composite adhesive force on the metals, and the like of a common polyurethane complex film adhesive.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane adhesive suitable for composite flexible packaging (food, beverage, medicine and cosmetics, etc.), in particular to a preparation method of a polyurethane laminating adhesive. The present invention relates to a polyurethane composition with excellent coating performance and good adhesive effect and its use. Background technique [0002] With the vigorous development of the commodity economy, a large number of industrial products, household daily necessities, food, medicines, etc. use plastic flexible packaging. People's daily life has been inseparable from various, beautiful and durable composite flexible packaging products. At the same time, the increasing variety of flexible packaging materials and the continuous improvement of processing technology make it play an increasingly important role in many fields. The core technology of composite flexible packaging processing is to laminate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/66C08G18/67C08G18/58
Inventor 叶桂香姚晓宁郭虹张平喻建明
Owner WANHUA CHEM BEIJING
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