Heat-detachable polyurethane hot melt adhesive, preparation raw materials, and preparation method and bonding method of heat-detachable polyurethane hot melt adhesive

A technology of polyurethane hot-melt adhesive and raw materials, applied in the field of polyurethane adhesives, can solve the problem of non-removable polyurethane hot-melt adhesive

Pending Publication Date: 2022-02-15
XIAMEN WELDTONE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first purpose of the present invention is to overcome the defect that the existing polyurethane hot melt adhesive cannot be disassembled after being completely cured, and to provide a preparation of a detachable polyurethane hot melt adhesive that can be completely disassembled at high temperature and will not automatically detach at high temperature raw material

Method used

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  • Heat-detachable polyurethane hot melt adhesive, preparation raw materials, and preparation method and bonding method of heat-detachable polyurethane hot melt adhesive
  • Heat-detachable polyurethane hot melt adhesive, preparation raw materials, and preparation method and bonding method of heat-detachable polyurethane hot melt adhesive

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Experimental program
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preparation example Construction

[0025] The raw materials for the preparation of the detachable polyurethane hot melt adhesive provided by the present invention contain polyol compounds, polyisocyanate compounds, sulfur-containing compounds and catalyst. Specifically, the mass ratio of the polyisocyanate compound to the polyol compound is (35-120):100, such as 35:100, 40:100, 45:100, 50:100, 55:100, 60:100, 65 :100, 70:100, 75:100, 80:100, 85:100, 90:100, 95:100, 100:100, 105:100, 110:100, 115:100, 120:100, etc. The mass ratio of the sulfur-containing compound to the polyol compound is (2.5-150):100, such as 2.5:100, 5:100, 10:100, 15:100, 20:100, 25:100, 30:100, 35:100, 40:100, 45:100, 50:100, 55:100, 60:100, 65:100, 70:100, 75:100, 80:100, 85:100, 90:100, 95: 100, 100:100, 105:100, 110:100, 115:100, 120:100, 125:100, 130:100, 135:100, 140:100, 145:100, 150:100, etc. The mass ratio of the catalyst to the polyol compound is (0.1-2):100, such as 0.1:100, 0.2:100, 0.5:100, 0.8:100, 1:100, 1.2:100, 1.5:100, 1...

Embodiment 1

[0038] In parts by weight, 54.5 parts of polycaprolactone diol with a number average molecular weight of 1,000, 2.8 parts of 2-hydroxyethyl disulfide , 0.1 part of 2,2-dimorpholino diethyl ether was added to the reaction flask, heated to 110°C, and vacuum dehydrated for 2 hours under the stirring condition of 150r / min; then cooled to 80°C, and 24.5 parts of 4,4 '-Diphenylmethane diisocyanate (MDI) was reacted for 2 hours at a stirring speed of 150r / min under vacuum conditions, and then discharged to obtain a removable polyurethane hot melt adhesive (referred to as CJ-1), which was stored in a vacuum seal.

Embodiment 2

[0040] In parts by weight, 44.0 parts of polybutylene adipate diol with a number average molecular weight of 2000, 22.0 parts of polytetrahydrofuran ether diol with a number average molecular weight of 1000, 6.8 parts of 2-hydroxyethyl disulfide, 0.5 Add 2 parts of dibutyltin dilaurate into the reaction flask, heat to 120°C, and vacuum dehydrate for 2h under 150r / min stirring condition; then cool down to 80°C, add 26.6 parts of hexamethylene diisocyanate (HDI), and Under the conditions, react at a stirring speed of 150r / min for 2h and discharge to obtain a detachable polyurethane hot-melt adhesive (referred to as CJ-2), which is stored in a vacuum seal.

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Abstract

The invention belongs to the field of polyurethane adhesives, and relates to a heat-detachable polyurethane hot melt adhesive, preparation raw materials, and a preparation method and a bonding method of the heat-detachable polyurethane hot melt adhesive. The preparation raw materials for the detachable polyurethane hot melt adhesive comprise a polyol compound, a polyisocyanate compound, a sulfur-containing compound and a catalyst in a mass ratio of 100: (35-120): (2.5-150): (0.1-2), wherein the sulfur-containing compound is at least one selected from 2,2-dithiodiethanol, 4,4-dihydroxy diphenyl disulfide, 4,4-diaminodiphenyl disulfide and liquid polysulfide resin. The polyurethane hot melt adhesive prepared from the raw materials can be completely detached at a high temperature and cannot be automatically separated at the high temperature, so the aim that a bonded part can be detached under a heating condition is perfectly fulfilled.

Description

technical field [0001] The invention belongs to the field of polyurethane adhesives, and in particular relates to a heated detachable polyurethane hot-melt adhesive, a preparation raw material, a preparation method and a bonding method. Background technique [0002] The existing reactive polyurethane hot melt adhesive is mainly composed of isocyanate-terminated oligomers, which can react with moisture in the air and form a cross-linked chemical structure after complete curing to achieve high bonding strength. The covalent bond obtained by the gas reaction is irreversible, the cross-linked structure is difficult to be destroyed, and it is difficult to realize the detachment of the adhesive even at a higher temperature. [0003] Specifically, the isocyanate first reacts with moisture in the air to produce carbamic acid, which is unstable and decomposes into primary amines, which continue to react with isocyanate to complete chain extension. The specific reaction process is as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/64C09J5/06C09J175/06C09J175/08
CPCC08G18/3863C08G18/6453C09J175/06C09J175/08C09J5/06C09J2475/00
Inventor 王署亮曹阳许逊福
Owner XIAMEN WELDTONE TECH CO LTD
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