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A kind of polishable flame-retardant automotive structural adhesive composition and preparation method thereof

A technology of automobile structure and composition, which is applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of poor grinding performance, poor flame retardancy, long curing time, etc., to improve initial tack, solve The effect of low temperature resistance

Inactive Publication Date: 2015-08-19
CHANGCHUN SANHUA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structural adhesive component uses polyurethane modified epoxy resin as the matrix resin, which solves the problem of epoxy resin becoming brittle and cracking after curing, and at the same time solves the problem of poor low temperature resistance of epoxy resin; nano talcum powder, nano Calcium carbonate and nano-titanium dioxide are used as pigments and fillers to solve the problem of poor abrasiveness in automotive structural adhesives; the curing agent used is a small molecule amine curing agent, which solves the problem of long curing time and difficulty in construction; Bisphenol A bis (diphenyl) phosphate is added as a flame retardant additive, which solves the problem of poor flame retardancy of ordinary structural adhesives. The flame retardant will not produce corrosive gases and toxic products, and is an environmentally friendly flame retardant additive

Method used

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  • A kind of polishable flame-retardant automotive structural adhesive composition and preparation method thereof
  • A kind of polishable flame-retardant automotive structural adhesive composition and preparation method thereof
  • A kind of polishable flame-retardant automotive structural adhesive composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Under nitrogen protection, 20g of epoxy resin E44, 3g of dihydroxypolysiloxane, 30g of hexamethylene diisocyanate, and 100ml of butanone were reacted for 2.5 hours at 80°C to obtain the first intermediate product;

[0029] Add 1.5 g of rosin resin and 0.0003 g of dibutyltin dilaurate to the first intermediate product, and continue the reaction at 85° C. for 2 h under the protection of nitrogen to obtain the second intermediate product.

[0030] Under nitrogen protection, 9.9 g of butanediol was added to the second intermediate product, and the temperature was raised to 90° C. for 1.5 h. After the reaction was terminated, butanone was removed under reduced pressure to obtain a polyurethane-modified epoxy resin.

Embodiment 2

[0032] Under nitrogen protection, 35g of epoxy resin E51, 2.3g of dihydroxypolysiloxane, 85g of isophorone diisocyanate, and 150ml of butanone were reacted for 4 hours at 80°C to obtain the first intermediate product;

[0033] Add 2.1 g of rosin resin and 0.0004 g of dibutyltin dilaurate to the first intermediate product, and continue the reaction at 85° C. for 2 h under the protection of nitrogen to obtain the second intermediate product.

[0034] Under nitrogen protection, 19.7 g of butanediol was added to the second intermediate product, and the temperature was raised to 90° C. for 1.5 h. After the reaction was terminated, butanone was removed under reduced pressure to obtain a polyurethane-modified epoxy resin.

Embodiment 3

[0036] Under the protection of nitrogen, 28g of epoxy resin E12, 3g of dihydroxypolysiloxane, 12g of hexamethylene diisocyanate, and 200ml of butanone were reacted for 3 hours at 80°C to obtain the first intermediate product;

[0037] Add 0.8 g of rosin resin and 0.0006 g of dibutyltin dilaurate to the first intermediate product, and continue the reaction at 85° C. for 2 h under the protection of nitrogen to obtain the second intermediate product.

[0038] Under nitrogen protection, 7.4 g of butanediol was added to the second intermediate product, and the temperature was raised to 90° C. for 1.5 h. After the reaction was terminated, butanone was removed under reduced pressure to obtain a polyurethane-modified epoxy resin.

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Abstract

The invention provides polyurethane-modified epoxy resin. According to the invention, rosin resin and siloxane structure are introduced into modified resin structure; and through butanediol chain-extending, the polyurethane-modified epoxy resin is obtained. The invention also provides a polyurethane-modified epoxy resin automobile structural adhesive comprising a component A and a component B. The component A comprises, by weight: 45-80 parts of polyurethane-modified epoxy resin, 0.6-2.0 parts of a dispersing agent, 24-48 parts of a pigment and filler, 0.5-1.3 parts of a flame-retarding additive, and 10-22 parts of cyclohexanone. The component B comprises, by weight: 28-43 parts of a curing agent, 0.3-1.2 parts of a defoaming agent, and 0.4-1.1 parts of a leveling agent. The automobile structural adhesive provided by the invention is qualified for grinding by using 1200mu sandpaper. The adhesive has an adhesive adhesion reaching a 0 grade. Under a temperature of -50 DEG C, the adhesive does not crack, and viscosity is not reduced. Under a temperature of 140 DEG C, problems such as cracking and viscosity reduction are not found.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a polishable flame-retardant automotive structural adhesive. Background technique [0002] Adhesives are ubiquitous in people's production and life. According to the performance of adhesives, they can be divided into structural adhesives and non-structural adhesives. Due to their high strength and high viscosity that non-structural adhesives cannot match, structural adhesives have been widely used in Automotive, construction and medical equipment and other fields. So far, the main resin used in structural adhesives is almost all epoxy resin. This is because epoxy resin contains a variety of polar groups and highly active epoxy groups, which have excellent adhesion to metal and non-metal surfaces, low curing shrinkage, heat resistance, water resistance and chemical resistance. , At the same time excellent electrical insulation, excellent mechanical strength and other characteristics. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C08G18/58C08G18/61
Inventor 张振久马海松周宇飞
Owner CHANGCHUN SANHUA IND
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