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Epoxy sealant and preparation method thereof

A technology of epoxy sealing and epoxy resin, which is applied in the direction of epoxy resin glue, chemical instruments and methods, adhesives, etc., and can solve the problems of poor toughness and low bond strength of sealant

Active Publication Date: 2014-05-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of low bonding strength and poor toughness of the sealant in the prior art, the present invention provides an epoxy sealant, which has high bonding strength and good toughness after curing, and can effectively ensure the sealing performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Preferably, when the main resin contains acrylonitrile-butadiene modified epoxy resin, amino-terminated polyetheramine modified epoxy resin and polyurethane modified epoxy resin, the above preparation method comprises: acrylonitrile - Butadiene-modified epoxy resin and curing agent are mixed and stirred evenly, and then polyurethane-modified epoxy resin, polyol, plasticizer, antioxidant and defoamer are added, and mixed and stirred evenly. Heat and stir the amino-terminated polyetheramine-modified epoxy resin, the filler, the curing accelerator and the thixotropic agent evenly. Then mix and stir the above two mixed resin mixtures evenly, roll them into a uniform paste on a three-roller grinder, and then degas the air in a vacuum, and punch the mixture out of a can to obtain an epoxy sealant.

[0036] The sealant can be applied by any technique known in the art. The sealant can be applied mechanically using a caulking gun to extrude the sealant onto the substrate, or it ...

Embodiment 1

[0039] This example is used to illustrate the epoxy sealant disclosed in the present invention and its preparation method.

[0040] Mix the bisphenol glycidyl ether with an epoxy equivalent of 200 and the amino-terminated polyetheramine evenly, so that the molar ratio of the epoxy group in the bisphenol glycidyl ether to the amino group in the amino-terminated polyetheramine is 6:1. The reaction was heated and stirred at 120°C for 3h. The amino-terminated polyetheramine modified epoxy resin was prepared.

[0041] With 100 parts by weight of amino-terminated polyetheramine modified epoxy resin, 4.5 parts by weight of plasticizer DMP, 0.3 parts by weight of defoamer BYK067, 0.15 parts by weight of antioxidant 1010, 3.5 parts by weight of lipophilic fumed silica, 10 parts by weight 1 part of CaO (average particle size is 400um), 0.44 parts by weight of imidazole and 3.5 parts by weight of dicyandiamide are mixed, heated and stirred evenly, rolled into a paste on a grinder, and t...

Embodiment 2

[0043] This example is used to illustrate the epoxy sealant disclosed in the present invention and its preparation method.

[0044] Mix the bisphenol glycidyl ether with an epoxy equivalent of 250 and the amino-terminated polyetheramine evenly, so that the molar ratio of the epoxy group in the bisphenol glycidyl ether to the amino group in the amino-terminated polyetheramine is 8:1. The reaction was heated and stirred at 110°C for 4h. The amino-terminated polyetheramine modified epoxy resin was prepared.

[0045] 30 parts by weight of amino-terminated polyetheramine modified epoxy resin, 16 parts by weight of polyol and 3.5 parts by weight of dicyandiamide were mixed and stirred evenly at 40°C, and 4.5 parts by weight of plasticizer DMP and 0.3 parts by weight of defoaming agent were added. Agent BYK067, 0.15 parts by weight of antioxidant 1010, stirred evenly at 40 ° C; 70 parts by weight of amino-terminated polyetheramine modified epoxy resin, 3.5 parts by weight of lip...

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PUM

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Abstract

The invention provides epoxy sealant and a preparation method thereof. The epoxy sealant comprises body resin, curing agent, filler and aids, wherein the body resin is chosen from one or more of acrylonitrile-butadiene modified epoxy resin, amine-terminated polyether modified epoxy resin or polyurethane modified epoxy resin, and the curing agent is chosen from guanidine and / or substituted guanidine. The epoxy sealant is high in bonding strength and fine in toughness after curing, and sealing performance can be effectively guaranteed.

Description

technical field [0001] The invention relates to an epoxy sealant and a preparation method thereof, in particular to an epoxy sealant for automobile parts and a preparation method thereof. Background technique [0002] In the production of automobile body, the welding of multi-layer steel plates is involved. In some parts, the edges of the multi-layer welded steel plates are exposed, such as the double-layer welded steel plates near the sunroof. These parts have the possibility of water, dust and other substances entering the pores between the welded steel plates. Therefore, these parts need to be sealed to prevent water leakage, rust and other problems caused by the entry of foreign objects. [0003] At present, the sealants used in automobiles are generally polyurethane glue and silicone sealant, but for the sealing and bonding between welded steel plates, these common sealants are not suitable. The seal between the welded steel plates needs to be coated with sealant on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J163/02C09J187/00C09J11/04C09K3/10
Inventor 赖学平唐富兰
Owner BYD CO LTD