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A kind of moisture curing polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, moisture-curing technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc. Low problems, to achieve the effect of improving performance requirements, convenient viscosity, and high initial viscosity

Active Publication Date: 2017-12-05
SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the convenience of operation and application, polyurethane usually requires a lower viscosity, and the molecular weight is only about a few thousand Daltons. During the curing process, compared with traditional non-reactive adhesives, it has poor initial bond strength, and initial adhesion Force is one of the important performance indicators of adhesives for shoes and bags
[0004] Chinese patent CN201310469047.8 discloses a method for preparing a moisture-curing reactive polyurethane hot melt adhesive for textiles. Adhesives and polyester-based moisture-curing reactive polyurethane hot-melt adhesives have both advantages, but the initial adhesion index still needs to be improved (it has been verified that the initial adhesion of hot-melt adhesives prepared by this invention is 2.62 N / 2.5cm ); Chinese patent CN201410691126.8 discloses a PTMG modified moisture-curing polyurethane hot-melt adhesive and its preparation method. By adding a polytetrahydrofuran fan PTMG to PUR, the comprehensive performance of the moisture-curing polyurethane hot-melt adhesive is improved. Its viscosity is too low, resulting in low initial tack index (it has been verified that the initial tack of hot melt adhesive prepared by this invention is 1.58 N / 2.5cm)

Method used

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  • A kind of moisture curing polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 40.00g of propylene oxide diol with a molecular weight of 1000, 42.00g of polybutylene adipate diol with a molecular weight of 3000, 43.20g of propylene oxide diol with a molecular weight of 4000, and a total of 1.82g of antioxidants 1076 and 1010 , put it into a 500ml three-neck flask, and heat and stir at 120-130°C for vacuum dehydration for 30min, and the absolute pressure is lower than 100Pa;

[0031] (2) Release the vacuum, then add 45.39g of polyacrylic acid resin while stirring, then raise the temperature to 130-140°C, and dehydrate under vacuum for 90min at the same time;

[0032] (3) Release the vacuum, stop heating and cool down to 90°C, then add 45.36g of 4,4'-diphenylmethane diisocyanate (MDI), catalyst stannous octoate and bis(2,2-morpholine ethyl) ether complex Compound 0.18g, vacuum reaction for 60min at 100°C-110°C, absolute pressure less than 100Pa, to obtain prepolymer;

[0033] (4) Release the vacuum, add 9.54g of pentaerythritol triacrylat...

Embodiment 2

[0038] (1) Weigh 44.78g of propylene oxide diol with a molecular weight of 1000, 60.46g of polybutylene adipate diol with a molecular weight of 3000, 53.74g of propylene oxide diol with a molecular weight of 4000, and 2.46g of antioxidants 1076 and 1010 , put it into a 500ml three-neck flask, and heat and stir at 120-130°C for vacuum dehydration for 30min, and the absolute pressure is lower than 100Pa;

[0039] (2) Release the vacuum, then add 73.60g of polyacrylic acid resin while stirring, then raise the temperature to 130-140°C, and dehydrate under vacuum for 90min at the same time;

[0040] (3) Release the vacuum, stop heating and cool down to 90°C, then add 68.40g of 4,4'-diphenylmethane diisocyanate (MDI), catalyst stannous octoate and bis(2,2-morpholine ethyl) ether complex Compound 0.25g, vacuum reaction at 100°C-110°C, absolute pressure less than 100Pa for 60min to obtain prepolymer;

[0041] (4) Release the vacuum, add 16.01g of pentaerythritol triacrylate and 1.95g...

Embodiment 3

[0046] (1) Weigh 37.87g of propylene oxide diol with a molecular weight of 1000, 45.45g of polybutylene adipate diol with a molecular weight of 3000, 53.02g of propylene oxide diol with a molecular weight of 4000, and a total of 2.03g of antioxidants 1076 and 1010 , put it into a 500ml three-neck flask, and heat and stir at 120-130°C for vacuum dehydration for 30min, and the absolute pressure is lower than 100Pa;

[0047] (2) Release the vacuum, then add 71.11g of polyacrylic acid resin while stirring, then raise the temperature to 130-140°C, and dehydrate under vacuum for 90 minutes at the same time;

[0048] (3) Release the vacuum, stop heating and cool down to 90°C, then add 52.41g of 4,4'-diphenylmethane diisocyanate (MDI), catalyst stannous octoate and bis(2,2-morpholine ethyl) ether complex Compound 0.20g, vacuum reaction at 100°C-110°C, absolute pressure less than 100Pa for 60min to obtain prepolymer;

[0049] (4) Release the vacuum, add 12.72g of dipentaerythritol pen...

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Abstract

The invention discloses a moisture-curing polyurethane hot-melt adhesive and a preparation method thereof. The moisture-curing polyurethane hot-melt adhesive is modified by selecting a modifier acrylate monomer containing a hydroxyl group and a polyurethane adhesive for graft copolymerization, so that the moisture-curing polyurethane hot-melt adhesive can be modified through The moisture-curing polyurethane hot-melt adhesive prepared by the invention has good comprehensive properties, has moderate viscosity to facilitate sizing operations, and has high initial tack, which improves performance requirements in special fields.

Description

technical field [0001] The invention relates to a moisture-curing polyurethane hot-melt adhesive and a preparation method thereof, in particular to a moisture-curing polyurethane hot-melt adhesive with high initial tack and a preparation method thereof. Background technique [0002] Polyurethane adhesives have many excellent properties and have been widely used in industries such as textiles, civil engineering, transportation, electronic components, shoemaking, and packaging abroad. Polyurethane adhesives are widely used in leather, artificial leather uppers and rubber soles, especially for some Bonding of new sole materials. [0003] At present, neoprene-based adhesives and moisture-curing polyurethane adhesives are the main adhesives used in domestic shoemaking, and solvent-based adhesives are commonly used in luggage factories. Both neoprene-based adhesives and solvent-based adhesives contain organic solvents, which are harmful to the environment and human body. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J175/06C09J175/14C08G18/42C08G18/48C08G18/67C08G18/76C08G18/62
Inventor 曾作祥曹盛李哲龙朱万育
Owner SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD
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