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Light-moisture dual-curing polyurethane hot melt adhesive

A polyurethane hot-melt adhesive, dual-curing technology, used in the field of light-moisture curing polyurethane hot-melt adhesive and reactive polyurethane hot-melt adhesive, can solve the problems of poor thermal stability of adhesives, curing rate colloid bubbles, long pressure holding time, etc. , to achieve the effect of fast fixing, improving initial adhesion and avoiding air bubbles

Pending Publication Date: 2021-11-30
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the slow reaction rate to moisture and low initial strength, it usually requires a long dwell time to limit its application.
There are usually two ways to increase the initial strength without changing the main body of the formula: 1) Increase the amount of catalyst, but it will cause the thermal stability of the adhesive to deteriorate, and the curing rate is too fast to cause the generation of colloidal bubbles
2) Introduce photocuring system. Currently commonly used free radical system has cathodic inhibition and no post-curing properties, so it cannot be used for bonding non-transparent materials. Cationic curing system is sensitive to moisture and corrosive to metals. limit its application

Method used

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  • Light-moisture dual-curing polyurethane hot melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In parts by weight, 30 parts of polybutylene adipate polyol with a molecular weight of 2000, 24 parts of polyoxypropylene diol with a molecular weight of 1000, and 8 parts of polyhexamethylene phthalate diol with a molecular weight of 1000 12.5 parts of polyacrylic acid resin BR103 were added to the reaction flask, heated to 130-140°C, and vacuum dehydrated for 2 hours under the stirring condition of 350r / min; then, the temperature was lowered to 100°C, and 24 parts of 4,4'-diphenyl Methyl methane diisocyanate (MDI), after reacting at a stirring speed of 450r / min for 1h under vacuum conditions, add 1 part of photobase generator (WPG174), 0.3 part of photosensitizer (4-isopropylthioxanthone ), 0.2 parts of catalyst (DMDEE) and continue to stir for 30 minutes before discharging, and store in a vacuum-sealed dark place.

Embodiment 2

[0028] In parts by weight, 22 parts of polyhexamethylene adipate polyol with a molecular weight of 2000, 28 parts of polytetrahydrofuran with a molecular weight of 2000, 10 parts of polyneopentyl adipate diol with a molecular weight of 1000, 18 parts Add polyacrylic resin (BR116) into the reaction flask, heat to 120-140°C, and vacuum dehydrate for 2h under the stirring condition of 350r / min; then, cool down to 100°C, add 26 parts of 4,4-diisocyanate bicyclic Hexylmethane (HMDI), after reacting at a stirring speed of 450r / min for 1h under vacuum, add 3 parts of photobase generator (WPG174), 0.9 part of photosensitizer (2,4-diethylthioxanthene- 9-ketone), 0.1 part of catalyst (DMDEE) and continue to stir for 30 minutes before discharging, and store in a vacuum-sealed dark place.

Embodiment 3

[0030] In parts by weight, 18 parts of polyhexamethylene adipate diol with a molecular weight of 3500, 24 parts of polycaprolactone diol with a molecular weight of 2000, 17 parts of polycarbonate diol with a molecular weight of 1000, 17 parts of Add polyacrylic acid resin (ELVACITE4197) into the reaction flask, heat to 120-140°C, vacuum dehydrate for 2h under stirring condition of 350r / min; then, cool down to 100°C, add 18 parts of 4,4'-diphenylmethane Diisocyanate (MDI), after reacting at a stirring speed of 450r / min for 1h under vacuum conditions, add 4.46 parts of photobase generator (WPG174), 1.46 parts of photosensitizer (2-isopropylthioxanthone), 0.08 part of catalyst (DMDEE) was discharged after continuing to stir for 30 minutes, and stored in a vacuum seal and protected from light.

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Abstract

The invention relates to a light-moisture dual-curing polyurethane hot melt adhesive comprising the components in parts by mass: 30 to 80 parts of a polyol polymer, 20 to 40 parts of a polyisocyanate compound, 0.5 to 10 parts of a photobase generator, 5 to 30 parts of thermoplastic resin, 3 to 12 parts of tackifying resin, 0.1 to 5 parts of a photosensitizer and 0.01 to 3 parts of a catalyst. The photobase generator capable of generating primary amine by illumination is introduced into a polyurethane system, a primary amine group generated by illumination quickly reacts with an isocyanate group, carbon dioxide gas is not generated, bubbles are avoided, and meanwhile, due to the delayed reaction characteristic of anions, the opening time has a certain adjustable space, the hot melt adhesive can be used for bonding non-light-transmitting materials; and due to the relatively fast cross-linking reaction, fast fixing can be achieved, and the initial adhesion of polyurethane is improved.

Description

technical field [0001] The invention relates to a reactive polyurethane hot-melt adhesive, in particular to a light-moisture curing polyurethane hot-melt adhesive, which belongs to the technical field of adhesives. Background technique [0002] Reactive polyurethane hot-melt adhesive is an environmentally friendly hot-melt adhesive, which not only has the process characteristics of ordinary hot-melt adhesives, but also has active isocyanate groups, which can still be compatible with moisture in the air at room temperature. Curing cross-linking reaction occurs, so as to obtain excellent bonding performance, good flexibility and weather resistance, so it is widely used in consumer electronics, woodworking, home appliances, textiles and other industries. [0003] However, due to the slow reaction rate to moisture and the low initial strength, it usually requires a long dwell time to limit its application. There are usually two ways to improve the initial strength without chang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/06
CPCC09J175/04C09J11/06C08K5/205
Inventor 刘磊陈田安王建斌
Owner YANTAI DARBOND TECH
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