Solvent-free single-component moisture-hardening polyurethane adhesive for recreational vehicle body and preparation method of the adhesive

A polyurethane adhesive and hyperbranched polyurethane technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive additives, etc., can solve problems such as adverse human health, air and ozone layer pollution, and achieve fast curing speed and good stability , good heat resistance and mechanical properties

Active Publication Date: 2019-11-22
山西省应用化学研究所(有限公司)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN 104017533A discloses a one-component moisture-curing polyurethane adhesive for automobile roofs and a preparation method thereof. The polyurethane adhesive has low temperature, fast curing speed, convenient use and stable storage, but it belongs to solvent-based one-component moisture-curing polyurethane , the diluent used is one or more of ethyl acetate, methyl acetate, dichloromethane, isopropyl acetate, dimethyl carbonate, n-hexane, cyclohexane and butyl acetate, all of the above diluents It is an organic volatile solvent, which will produce a large amount of VOCs (volatile organic compounds), pollute the atmosphere and the ozone layer, and be harmful to human health

Method used

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  • Solvent-free single-component moisture-hardening polyurethane adhesive for recreational vehicle body and preparation method of the adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mix 16g of phthalic acid and 57g of polyoxypropylene diol (hydroxyl value 279.5mgKOH / g) in a reactor, stir and heat under nitrogen atmosphere until completely melted, add catalyst tetrabutyl titanate, heat up to 170°C for 4 hours , continue to heat up to 230 ° C for 3 h. The acid value of the detection system is 8.23mgKOH / g, the pressure is reduced to below 0.02MPa, the reaction is maintained at 230°C, and the reaction is stopped when the acid value of the system is 0.42mgKOH / g. The hydroxyl value of the reaction product was detected to be 56.83 mgKOH / g, and the temperature was lowered to discharge to obtain polyether ester diol containing benzene rings.

[0041] Weigh 55 g of the above-prepared polyether ester diol containing benzene rings into the reactor, raise the temperature to 110° C., and vacuum dehydrate for 2 hours. Cool to 50°C, add 20.68g of carbodiimide-modified 4,4'-diphenylmethane diisocyanate, heat up to 65°C for 1 hour, add 0.62g of 1,4-butanediol, heat...

Embodiment 2

[0048] Mix 15g of phthalic acid and 48.2g of polyoxypropylene diol (hydroxyl value 282.7mgKOH / g) in a reactor, stir and heat under nitrogen atmosphere until completely melted, add catalyst tetrabutyl titanate, and heat up to 180°C for reaction 3h, continue to heat up to 230°C for 3h. The acid value of the detection system is 9.45mgKOH / g, the pressure is reduced to below 0.02MPa, and the reaction is maintained at 230°C until the acid value of the system is 0.38mgKOH / g to stop the reaction. The hydroxyl value of the reaction product was detected to be 56.48 mgKOH / g, and the temperature was lowered to discharge to obtain polyether ester diol containing benzene ring.

[0049] Weigh 55 g of the above-prepared polyether ester diol containing benzene rings into the reactor, raise the temperature to 110° C., and vacuum dehydrate for 2 hours. Cool to 50°C, add 24.09g of carbodiimide-modified 4,4'-diphenylmethane diisocyanate, heat up to 65°C for 1 hour, add 0.53g of 1,2-propanediol, h...

Embodiment 3

[0056] Mix 15g of phthalic acid and 54.2g of polytetrahydrofuran diol (hydroxyl value 281.3mgKOH / g) in a reactor, stir and heat under nitrogen atmosphere until completely melted, add the catalyst tetrabutyl titanate, and raise the temperature to 170°C for 4 hours , continue to heat up to 230 ° C for 3 h. The acid value of the detection system is 8.23mgKOH / g, the pressure is reduced to below 0.02MPa, and the reaction is maintained at 230°C until the acid value of the system is 0.47mgKOH / g to stop the reaction. The hydroxyl value of the reaction product was detected to be 57.21 mgKOH / g, and the temperature was lowered to discharge to obtain polyether ester diol containing benzene ring.

[0057] Weigh 65 g of the above-prepared polyether ester diol containing benzene rings into the reactor, raise the temperature to 110° C., and vacuum dehydrate for 2 hours. Cool to 50°C, add 30.09g of carbodiimide-modified 4,4'-diphenylmethane diisocyanate, heat up to 65°C for 1 hour, add 0.88g ...

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Abstract

The invention discloses a solvent-free single-component moisture-hardening polyurethane adhesive for a recreational vehicle body. The adhesive is obtained by mixing 70-100 parts by weight of silane coupling agent modified polyurethane resin and 20-30 parts by weight of second-generation isocyanate-terminated hyperbranched polyurethane, and then adding 1-3 parts by weight of an oxazolidine latent curing agent and 0.1-0.15 part by weight of a polyurethane moisture hardening catalyst. Polyether ester diol containing benzene rings is used as a soft segment; the polyurethane resin is modified by the silane coupling agent, and the second-generation isocyanate-terminated hyperbranched polyurethane is introduced, so that the adhesive is endowed with relatively strong mechanical properties, hydrolysis resistance and high and low temperature resistance, the bonding strength of the adhesive to a base material is improved, and the adhesive is used for bonding materials of a recreational vehicle body, and the bonding strength can reach the damage degree of the materials.

Description

technical field [0001] The invention belongs to the technical field of adhesive preparation, and relates to a one-component polyurethane adhesive, in particular to a one-component moisture-curing polyurethane adhesive suitable for the structure of a car body, and a preparation method of the adhesive. Background technique [0002] In recent years, the development of the tourism industry has promoted the development of the tourism equipment manufacturing industry including RVs, and the rise of the family self-driving leisure vacation market has also stimulated the demand and supply of RV products. [0003] The car body structure is usually composed of three materials: "external sheet + interlayer material + internal sheet", so it is also called a sandwich body structure. The sandwich body structure is generally used for the side walls and roof of the caravan, with the purpose of wall support, heat preservation, sound insulation, and protection of the interior of the caravan fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J187/00C09J11/06C08G18/66C08G18/42C08G18/32C08G83/00
CPCC08G18/3206C08G18/3893C08G18/4252C08G18/6651C08G83/005C08L2201/08C09J11/06C09J175/06C08L87/00C08K5/353
Inventor 石红翠姚卫琴张博毛祖秋宋利青马国章贾金兰
Owner 山西省应用化学研究所(有限公司)
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