Preparation method of organic silicon modified polyurethane hot melt adhesive

A polyurethane hot-melt adhesive and modified polyester technology, applied in the field of structural adhesives, can solve the problems of reducing the solvent resistance and aging resistance of polyurethane hot-melt adhesive coatings, so as to improve compatibility and improve aging resistance. performance, the effect of improving solvent resistance

Inactive Publication Date: 2020-04-17
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These non-reactive system tackifying resins cannot participate in curing to form a crosslinked network, which easily reduces the solvent resistance and aging resistance of polyurethane hot melt adhesive coatings.

Method used

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  • Preparation method of organic silicon modified polyurethane hot melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put 10 parts of dimethyldimethoxysilane, 10 parts of methylphenyldimethoxysilane, and 10 parts of diphenyldimethoxysilane into the three-necked upper bottle, and add Lewatit S -100, heat up to 40°C for 2 hours, then stir 20 parts of HJ-0511 evenly, heat up to 100°C, react for 4 hours, filter while hot to obtain a block copolymer of silicone-modified polyester polyol;

[0022] (2) 20 parts of Evonik 7360, 50 parts of the silicone-modified polyester polyol block copolymer synthesized in step (1), heated to 100°C, vacuumed to remove water for about 3 hours, and cooled to 50°C , under the protection of nitrogen, add 10 parts of isocyanate MDI, carry out polymerization reaction for 2 hours, and then add 0.1 part of triethanolamine to obtain silicone-modified polyurethane hot melt adhesive.

Embodiment 2

[0024] (1) Put 20 parts of dimethyldimethoxysilane, 20 parts of methylphenyldimethoxysilane, and 20 parts of diphenyldimethoxysilane into the three-necked upper bottle, and add Lewatit S -100, heat up to 60°C for 2 hours, then stir 40 parts of HJ-R380 evenly, heat up to 120°C, react for 6 hours, and filter while hot to obtain a block copolymer of silicone-modified polyester polyol;

[0025] (2) 30 parts of Evonik 7380, 70 parts of the silicone-modified polyester polyol block copolymer synthesized in step (1), heated at 120°C, vacuumed to remove water for about 5 hours, and cooled to 70°C , under the protection of nitrogen, add 30 parts of isocyanate MDI, carry out polymerization reaction for 6 hours, and then add 2 parts of triethanolamine to obtain silicone-modified polyurethane hot melt adhesive.

Embodiment 3

[0027] (1) Add 15 parts of dimethyldimethoxysilane, 15 parts of methylphenyldimethoxysilane, and 115 parts of diphenyldimethoxysilane into the three-necked upper bottle, and add Lewatit S -100, heat up to 60°C for 2 hours, then stir 35 parts of HJ-7380H evenly, heat up to 100°C, react for 6 hours, filter while hot to obtain a block copolymer of silicone-modified polyester polyol;

[0028] (2) 10 parts of Evonik 7360+10 parts of Evonik 7380, 60 parts of the block copolymer of silicone-modified polyester polyol synthesized in step (1), heated at 120°C, and vacuumed to remove water for about 5 Hours, the temperature was lowered to 70°C, under the protection of nitrogen, 25 parts of isocyanate MDI was added, and the polymerization reaction was carried out for 3 hours, and then 1 part of 2,2-dimorpholinyl was added to obtain a silicone-modified polyurethane hot melt adhesive.

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Abstract

The invention relates to a preparation method of an organic silicon modified polyurethane hot melt adhesive. The method comprises the steps: (1) adding 1-20 parts by mass of dimethyl dimethoxy silane,1-20 parts by mass of methylphenyldimethoxysilane and 1-20 parts by mass of diphenyl dimethoxysilane into a three-neck flask, adding 1-5 parts by mass of an acidic resin catalyst, heating to 40-60 DEG C, carrying out a reaction for 1-2 h, then adding 20-40 parts by mass of polyester polyol, and filtering while hot to obtain a segmented copolymer of organic silicon modified polyester polyol; and (2) adding 10-30 parts by mass of isocyanate MDI into 20-30 parts by mass of liquid polyester diol and 50-70 parts by mass of the segmented copolymer of the organic silicon modified polyester polyol synthesized in the step (1), carrying out polymerization reaction for 2-6 h, and then adding 0.1-2 parts by mass of a catalyst to obtain the organic silicon modified polyurethane hot melt adhesive.

Description

technical field [0001] The invention belongs to the technical field of structural adhesives, and in particular relates to silicone-modified polyurethane hot-melt adhesives and a preparation method thereof, which are mainly used in structural bonding fields such as electronics and electrical appliances, display screens, and lithium batteries. [0002] technical background [0003] Polyurethane hot melt adhesive is a new generation of structural adhesive that can provide excellent bonding performance. It is a type of hot melt adhesive made of polyurethane prepolymer as the main material and various additives. Polyurethane hot melt adhesives are easy to use and environmentally friendly, and their performance is comparable to solvent-based hot melt adhesives. In the past ten years, polyurethane hot melt adhesives have been rapidly developed and widely used in high-end fields such as the electronics and electrical industries, and the automotive industry. Polyurethane hot melt adh...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/61C08G18/42C08G18/40C08G77/445C09J175/06
CPCC08G18/4009C08G18/42C08G18/61C08G18/7671C08G77/445C08G2170/20C09J175/06
Inventor 徐庆锟王建斌陈田安
Owner YANTAI DARBOND TECH
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