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Moisture-cured polyurethane hot melt adhesive for car lamp and preparation method thereof

A polyurethane hot-melt adhesive, moisture-curing technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem of reduced strength, poor initial adhesion of one-component silicone adhesives, and long standing time and other problems, to achieve the effect of excellent high temperature resistance

Inactive Publication Date: 2014-04-23
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved: In order to solve the disadvantages of ordinary hot melt adhesives in the current application of car lamp bonding, the strength of which is reduced in a hotter environment, the initial adhesion of the single-component silicone adhesive is poor, and the shortcoming of placing the glue for a long time after application

Method used

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  • Moisture-cured polyurethane hot melt adhesive for car lamp and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of the moisture-curing polyurethane hot-melt adhesive for car lights is as follows in terms of weight fraction: 40 parts of polyester polyol adipate-1,4-butanediol PBA, 1020 parts of polycarbonate diol JSB, and Put 20 parts of 1,4-butanediol phthalate in a reaction kettle, heat to 120°C, vacuum dehydrate under stirring for 2 hours, then cool down to 70°C; take 15 parts of polyisocyanate MDI, preheat to 60°C , added to the reaction kettle, and slowly stirred, the temperature was raised to 90°C. The prepolymerization reaction was carried out under stirring at 90° C. for 2 h. After the prepolymerization is completed, add 0.0001 parts of catalyst dimorpholino diethyl ether and 5 parts of carbon black, heat up to 120°C and vacuumize to remove air bubbles for 30 minutes (vacuum degree ≥ 0.095MPa), pour out the product under the condition of nitrogen protection , sealed and packaged to obtain a moisture-curing polyurethane hot-melt adhesive for car ligh...

Embodiment 2

[0017] The preparation method of the moisture-curing polyurethane hot-melt adhesive for car lights is as follows in terms of weight fraction: 40 parts of polyester polyol adipate-1,6-hexanediol ester PHA, polycarbonate diol G-467230 20 parts of polyisocyanate TDI-800, preheated to 60 ℃, added to the reaction kettle, and slowly stirred, the temperature was raised to 90°C. The prepolymerization reaction was carried out under stirring at 90° C. for 2 h. After the prepolymerization is completed, add 0.0005 parts of dibutyltin dilaurate and 10 parts of carbon black as catalysts, raise the temperature to 120°C and vacuumize to remove air bubbles for 30 minutes (vacuum degree ≥ 0.095MPa), pour out the product under the condition of nitrogen protection, and seal the package , to obtain a moisture-curing polyurethane hot-melt adhesive for lamps.

Embodiment 3

[0019] The preparation method of the moisture-curing polyurethane hot-melt adhesive for car lights is as follows in terms of weight fraction: polyester polyol sebacic acid-1,4-butylene glycol ester 35, polycarbonate diol G-467 220 parts , 17 parts of -1,4-butanediol phthalate were placed in a reaction kettle, heated to 120°C, vacuum dehydrated for 2 hours under stirring, and then cooled to 70°C; 18 parts of polyisocyanate MDI were taken and preheated to 60°C, add to the reaction kettle, stir slowly, and raise the temperature to 90°C. The prepolymerization reaction was carried out under stirring at 90° C. for 2 h. After the prepolymerization is completed, add 0.001 parts of dibutyltin dilaurate catalyst and 10 parts of carbon black, heat up to 120°C and vacuumize to remove air bubbles for 30 minutes (vacuum degree ≥ 0.095MPa), pour out the product under the condition of nitrogen protection, and seal the package , to obtain a moisture-curing polyurethane hot-melt adhesive for l...

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Abstract

The invention provides a moisture-cured polyurethane hot melt adhesive for a car lamp and a preparation method of the hot melt adhesive. The preparation method comprises the following steps: placing polyester polyol into a reaction kettle and heating; agitating and dehydrating in vacuum; then cooling; pre-heating diphenylmethane diisocyanate and adding into the reaction kettle; agitating in vacuum to carry out a pre-polymerization reaction; after the reaction, introducing nitrogen and pouring out a product under a protection condition; and sealing and packaging to obtain the moisture-cured polyurethane hot melt adhesive for the car lamp. The hot melt adhesive obtained by the invention has high initial and final bonding strength; the initial 180-degree stripping strength is more than or equal to 60N / 25mm and the final 180-degree stripping strength is more than or equal to 900N / 25mm; the surface drying time is less than 60 seconds; the moisture-cured polyurethane hot melt adhesive is not softened to flow at 180 DEG C and has a good sizing temperature (120 DEG C).

Description

technical field [0001] The invention discloses a method for preparing a moisture-curing polyurethane hot-melt adhesive for vehicle lights, relates to a reactive polyurethane hot-melt adhesive, and belongs to the technical field of polyurethane hot-melt adhesive preparation. Background technique [0002] In traditional car lamp bonding applications, ordinary hot melt adhesives and one-component silicone adhesives are usually used. Ordinary hot melt adhesives cure quickly and are suitable for mass industrial production. However, ordinary hot melt adhesives are thermoplastic products, and their strength is significantly reduced in a hotter environment, which is easy to cause water leakage and glue opening; although the single-component silicone adhesive has improved high and low temperature performance, it has poor initial adhesion. Devices are often immobile for hours, taking up space and extending lead times. The moisture-curing polyurethane hot melt adhesive can solve the ...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J11/04C08G18/76C08G18/42C08G18/24
Inventor 林中祥何永富朱成伟陶小乐林星李强
Owner NANJING FORESTRY UNIV
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