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High-resilience ultraviolet light and moisture dual-curing hot melt adhesive and preparation method thereof

A dual-curing and ultraviolet light technology, applied in the field of polyurethane hot melt adhesives, can solve the problems that the screen cannot be reworked, the edge banding tape cannot be reworked, and the curing time is long, etc., achieving reworkability, less cleaning, and simple preparation methods.

Pending Publication Date: 2021-09-03
SUZHOU ENBRIGHTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Poor cushioning when bonding large screens, no impact resistance, oppressive light leakage;
[0004] 2. The bonded screen cannot be reworked or repaired; and when the yield rate is low, there will be many waste products;
[0005] 3. The curing time is too long and needs to be left standing. It cannot be like a sample of edge banding tape. After pasting the glue, it will enter the next process immediately.

Method used

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Examples

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preparation example Construction

[0034] A method for preparing a high-resilience ultraviolet light and moisture dual-curing hot-melt adhesive, comprising the following steps:

[0035]In terms of parts by weight, 20-60 parts of rubber containing terminal hydroxyl groups, 5-30 parts of polyester polyol and 20-50 parts of polyether polyol are stirred and dehydrated at a speed of 100-500 rpm under a vacuum condition of 100-130 °C 1-3h, then lower the temperature to 70-90°C, add 1-10 parts of trifunctional small molecule polyols, stir evenly, add one-third to five-sixths of the total polyisocyanate, after reacting for 1-6h, add 1 -30 parts of UV active monomer without hydroxyl or amino groups, 1-5 parts of photoinitiator, 0.2-2 parts of adhesion promoter, 0.2-3 parts of defoamer and 0.1-1 part of catalyst and remaining polyisocyanate, continue After the reaction is complete, vacuum defoaming, and then discharge.

Embodiment 1

[0037] A method for preparing a high-resilience ultraviolet light and moisture dual-curing hot-melt adhesive, comprising the following steps:

[0038] (1) In parts by weight, weigh 30 parts of 2000 molecular weight butylene glycol adipate polyol, 50 parts of 2000 molecular weight polyoxypropylene diol, 50 parts of 4000 molecular weight terminal hydroxybutyl rubber, add 500ml four-port in a flask, and vacuum dehydrated at 130°C for 2 hours, with a stirring speed of 300rpm and an absolute pressure of 50-80Pa;

[0039] (2) Cool down to 80°C, blow in nitrogen to release the vacuum, add 3 parts of trimethylolpropane, stir evenly, add 30 parts of 4,4'-diphenylmethane diisocyanate (MDI), and stir under nitrogen protection Speed ​​300rpm, reaction 2h;

[0040] (3) Under nitrogen protection and stirring conditions, continue to add 20 parts of TPGDA, 2 parts of 651 photoinitiator, 0.5 part of adhesion promoter KH560, 0.5 part of JSC-1120 defoamer, and catalyst dibutyltin dilaurate into...

Embodiment 2

[0042] A method for preparing a high-resilience ultraviolet light and moisture dual-curing hot-melt adhesive, comprising the following steps:

[0043] (1) In parts by weight, weigh 30 parts of 3000 molecular weight butylene glycol sebacate polyol, 20 parts of 3000 molecular weight polyoxypropylene diol, 20 parts of 2000 molecular weight terminal hydroxy butyl rubber, add 500ml four-port in a flask, and vacuum dehydrated at 130°C for 2 hours, with a stirring speed of 300rpm and an absolute pressure of 50-80Pa;

[0044] (2) Cool down to 70°C, blow in nitrogen to release the vacuum, add 2.5 parts of glycerol, stir evenly, add 26 parts of 4,4'-diphenylmethane diisocyanate (MDI), under the condition of nitrogen protection, the stirring speed is 300rpm , reaction 2h;

[0045] (3) Under nitrogen protection and stirring conditions, continue to add 20 parts of TPGDA, 2 parts of 651 photoinitiator, 0.5 part of adhesion promoter A1120, 0.2 part of JSC-1120 defoamer, catalyst dibutyltin ...

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PUM

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Abstract

The invention discloses a high-resilience ultraviolet light and moisture dual-curing hot melt adhesive and a preparation method thereof. The hot melt adhesive comprises hydroxyl-terminated rubber, polyester polyol, polyether polyol, a hydroxyl-free or amino-free UV active monomer, polyisocyanate, trifunctional micromolecular polyol, a photoinitiator, a defoaming agent, an adhesion promoter and a catalyst. The elasticity and flexibility of a hot melt adhesive product are improved by adding the hydroxyl-terminated rubber; the hydroxyl-free or amino-free UV active monomer does not participate in polymerization reaction in the early stage, so that the final product becomes viscoelastic after being irradiated by UV light, and the cleaning of excessive glue is reduced; the polyisocyanate is added in batches, so that the molecular weight of the polymer can be increased, the initial bonding strength is quickly improved within the same curing time, the positioning time is shortened, and the production efficiency is improved; the initial adhesion after dispensing is improved, the buffer resistance of large screen frame adhesion is improved, the reworkability of screen frame adhesion is achieved, and the hot melt adhesive can replace traditional screen sealing adhesive tapes, and realizes narrow frame dispensing.

Description

technical field [0001] The invention belongs to the technical field of polyurethane hot-melt adhesives, and in particular relates to a high-resilience ultraviolet light and moisture dual-curing hot-melt adhesive and a preparation method thereof. Background technique [0002] With the development of the consumer electronics industry, the automation and narrow-frame screen bonding technology that replaces traditional edge-banding tapes has gradually become a development trend, which puts forward new requirements for the development of corresponding adhesives. At present, the bonding of large screens on the market basically adopts the dual curing principle of ultraviolet light and moisture to make PUR glue. Shorten curing time and enhance adhesion. However, the glue on the market still has the following problems to be solved urgently: [0003] 1. Poor cushioning when bonding large screens, no impact resistance, oppressive light leakage; [0004] 2. The bonded screen cannot b...

Claims

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Application Information

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IPC IPC(8): C09J4/02C09J4/06
CPCC09J4/06
Inventor 李恒王泽勇
Owner SUZHOU ENBRIGHTECH
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