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Polyurethane hot-melt adhesive for bonding and preparation method thereof

A polyurethane hot-melt adhesive and bonding technology, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of short sizing opening time, complicated production process of hot-melt adhesives, and insufficient strength. , to achieve the effect of good peeling performance

Active Publication Date: 2012-07-18
WUXI WANLI ADHESION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage is that the softening point is increased, but the disadvantage is that the strength is not enough and the open time of the sizing is relatively short
Its advantages are high bonding strength, good vibration resistance, low cost, and environmental friendliness, but the production process of the hot melt adhesive is complicated, and the colloid is easy to soften and flow under high temperature

Method used

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  • Polyurethane hot-melt adhesive for bonding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A polyurethane hot melt adhesive for bonding, the components are: 10 parts of high crystallinity polyester diol, 52 parts of polyester polyol, 18 parts of diisocyanate, 16 parts of tackifying resin, 0.1 part of catalyst, 1 part of antioxidant part, 0.8 part of coupling agent, 0.1 part of viscosity stabilizer, and 2 parts of gray paste.

[0027] The preparation steps are as follows:

[0028] (1) Pretreatment: High crystalline polyester diol polyadipate-1,6-hexanediol (PHA), polyhexamethylene carbonate (PHC) polyadipate-1,4-butanediol Alcohol ester (PBA), polyester polyol P(E / P)A, P(E / B)A random copolyester, and hydrogenated rosin resin are put into the reaction kettle in proportion, heated to 120°C, and stirred under vacuum Dehydration for 1.5 to 2 hours, vacuum degree -0.095 to 0.05Mpa, then lower the temperature to 80°C;

[0029] (2) Preparation of isocyanate-terminated prepolymer: Take the measured diisocyanate MDI, preheat to 60°C, add to the reactor and stir evenl...

Embodiment 2

[0033] A polyurethane hot melt adhesive for bonding, the components of which are: 11 parts of high crystalline polyester diol, 50 parts of polyester polyol, 19 parts of diisocyanate, 15 parts of tackifying resin, 0.1 part of catalyst, antioxidant 1 part, 0.8 parts of coupling agent, 0.1 part of viscosity stabilizer, 3 parts of gray paste.

[0034] The preparation steps are as follows:

[0035] (1) Pretreatment: high crystalline polyester diol PHC, PBA, polyester polyol P(E / P)A, P(E / B)A random copolyester, tackifying resin hydroxyl-terminated thermoplastic polymer Put the ester, hydrogenated rosin resin, and terpene resin into the reaction kettle in proportion, heat to 120°C, vacuum dehydrate under stirring for 1.5-2 hours, -0.095-0.05Mpa, and then cool down to 80°C;

[0036] (2) Preparation of isocyanate-terminated prepolymer: Take the measured diisocyanate MDI, preheat to 60°C, add to the reactor and stir evenly, and carry out prepolymerization reaction at 75-85°C for 90-120...

Embodiment 3

[0040] A polyurethane hot melt adhesive for bonding, the components of which are as follows: 12 parts of high crystallinity polyester diol, 50 parts of polyester polyol, 15 parts of diisocyanate, 17 parts of tackifying resin, 0.2 part of catalyst, antioxidant 1.5 parts, 1.2 parts of coupling agent, 0.1 parts of viscosity stabilizer, 2 parts of gray paste.

[0041] The preparation steps are as follows:

[0042] (1) Pretreatment: modify high crystalline polyester diols PHA, PHC, polyester polyols P(E / DE)A, P(E / P)A random copolyesters, and tackifying resin styrene The terpene resin is put into the reaction kettle in proportion, heated to 120°C, vacuum dehydrated under stirring for 1.5 to 2 hours, -0.095 to 0.05Mpa, and then cooled to 80°C;

[0043] (2) Preparation of isocyanate-terminated prepolymer: Take the measured diisocyanate MDI, preheat to 60°C, add to the reactor and stir evenly, and carry out prepolymerization reaction at 75-85°C for 90-120min;

[0044] (3) Addition of...

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Abstract

The invention relates to a polyurethane hot-melt adhesive for bonding and a preparation method thereof, belonging to the technical field of preparation of automobile hot-melt adhesives. The preparation method comprises the following steps of: firstly, feeding high-crystalline polyester glycol, polyester polyol and tackifying resin into a reactor, heating, dehydrating at vacuum while stirring, andthen cooling; secondly, preheating diisocyanate, adding the preheated diisocyanate to the reactor to uniformly stir and carrying out prepolymerization reaction; after the prepolymerization is finished, sequentially adding weighed catalyst, antioxidant, coupling agent, viscosity stabilizer and grey paste under nitrogen circulation, and stirring till being mixed uniformly; discharging in the nitrogen protection condition, sealing and packaging so as to obtain the product, that is, the polyurethane hot-melt adhesive for bonding automobile lights. The hot-melt adhesive prepared by adopting the preparation method disclosed by the invention can be used for bonding a plurality of base materials such as PP (Polypropylene), PBT (polybutylece terephthalate), ABS (Acrylonitrile Butadiene Styrene), PMMA (polymethyl methacrylate), PC (Poly Carbonate) and inorganic glass.

Description

technical field [0001] The invention relates to a polyurethane hot-melt adhesive for bonding and a preparation method thereof, in particular to a polyurethane hot-melt adhesive for bonding parts such as car lamp plastic bases and front covers and a preparation method thereof, belonging to automotive hot-melt adhesives Preparation technology field. Background technique [0002] Hot melt adhesive for automotive lamps is used to bond the plastic base and front cover of the lamp, and is applied to the headlights, rear taillights and anti-fog lamps of the automobile. The materials of car lights are mostly difficult to stick materials: the lamp holders are mostly molded from polypropylene, and the materials of the lamp surface are glass, polycarbonate, polyacrylate and so on. The polarity and surface energy of these materials are quite different. To achieve the ideal bonding effect, the adhesive must have good adhesion, water resistance, weather resistance, and shock resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J167/00C09J193/04C09J145/00C09J11/06
Inventor 林长灿刘小丽
Owner WUXI WANLI ADHESION MATERIALS
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