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Epoxy mono-component structural adhesive and preparation method thereof

A technology of structural glue and epoxy sheet, which is applied in the direction of epoxy resin glue, adhesive, adhesive type, etc., can solve the problems of difficulty in comprehensive performance improvement, complex and multi-faceted influence of comprehensive performance, and inability to improve comprehensive performance, etc., to achieve Effect of high T-peel strength and high shear strength

Active Publication Date: 2019-04-19
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technology generally starts from two aspects. On the one hand, the optimization of each component of the glue formula is very complicated. Because the curing process of the glue and the interface interaction process are very complicated, it is difficult to clearly determine the main factors that affect it, such as The content of fillers, the compatibility of resin components and tougheners, etc., therefore bring difficulties to the comprehensive improvement of performance; on the other hand, the addition of coupling agents to the glue system has a clear effect on improving the interface. However, the addition of coupling agent and the influence of its content on the comprehensive performance are complex and multifaceted.
Therefore, it may not be possible to improve overall performance or achieve a reasonable performance balance

Method used

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  • Epoxy mono-component structural adhesive and preparation method thereof
  • Epoxy mono-component structural adhesive and preparation method thereof
  • Epoxy mono-component structural adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] The present invention also provides a preparation method of the above-mentioned epoxy one-component structural adhesive, comprising the following steps:

[0079] Add active diluent, core-shell rubber, resin-modified nitrile rubber, and polyurethane toughener to the epoxy resin and disperse evenly, then add water-absorbing agent, filler, thixotropic agent, curing agent and curing accelerator to mix and stir, vacuum Degassing to obtain epoxy one-component structural adhesive.

[0080] When the formulation of the present invention is designed, under the condition that the comprehensive properties (such as shear strength and T-peel strength) can meet the basic requirements, the components participating in the curing cannot reach the optimal curing conditions, and deliberately make it deviate from the ideal reaction ratio. Improvements in the type of damage are thereby achieved.

[0081] In the present invention, by controlling the ratio of the curing accelerator and the cu...

Embodiment 1

[0084] 1. See Table 1 for the list of basic ingredients in the following examples

[0085] Table 1

[0086]

[0087]

[0088]In Table 1, the specific types of raw materials are as follows:

[0089] Mixed epoxy resin: liquid epoxy resin and solid epoxy resin are mixed according to the mass ratio of 3:1, and melted at 95-100°C; the solid resin is D.E.R.671 epoxy resin (Dow Chemical Co., Ltd.); liquid resin BE501H Epoxy resin, Changchun Chemical (Jiangsu) Co., Ltd.

[0090] Core-shell rubber: MX154 core-shell rubber, composed of rubber particles dispersed in epoxy resin (wherein the core-shell particle size is 25-200nm, and the mass fraction of core-shell particles is 40%), Japan Kaneka Company;

[0091] Resin-modified nitrile rubber: Hypro-861340 epoxy resin-modified liquid nitrile rubber, CVC Thermoset Specialties of the United States (wherein the mass fraction of core-shell particles is 40%, and the mass fraction of epoxy resin is 60%);

[0092] The active diluent is:...

Embodiment 2

[0112] According to the specific selection of components in the formula in Example 1, as well as the preparation method and test method, the preparation of the epoxy one-component structural adhesives in Examples D1 to D4 is carried out, see Table 3 for details

[0113] table 3

[0114] Element

[0115] Discussion of Table 3: On the basis of optimizing the relative content of accelerator / curing agent, the interface failure types of embodiment D1-D4 / C2 are cohesive failure, and T-peel strength and shear strength are maintained at a relatively high performance level.

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Abstract

The invention provides an epoxy mono-component structural adhesive. The structural adhesive includes epoxy resin, core-shell rubber, resin modified butadiene acrylonitrile rubber, a flexibilizer, a reactive diluent, a curing agent, a curing accelerator, a thixotropic agent, a water absorbing agent and a filling material; and the mass ratio of the curing accelerator to the curing agent is 1 : (24-60). Through the controlling of the proportion of the curing accelerator and the curing agent in components of the structural adhesive, a debonding failure form can be cohesive failure; and the structural adhesive has high shearing strength and T-type peeling strength.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to an epoxy one-component structural adhesive and a preparation method thereof. Background technique [0002] Epoxy one-component structural adhesive is mainly used in the automobile industry to replace the traditional welding process. An important performance index of the adhesive performance is the T-shaped peel strength and failure form. In addition to achieving a certain peel strength, the failure form is generally required to be within poly damage (see below figure 1 , figure 1 is a photo of cohesive failure in the form of failure). Intuitively speaking, there must be residual cured products on the surface of the damaged substrate. However, in practice, it often happens that the peel strength is acceptable, but the interface failure form is non-cohesive failure: such as adhesive failure and mixed failure, the adhesive failure is manifested by no or little curin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J109/00C09J163/00C09J109/02C09J11/04C09J11/08
CPCC08K2003/2206C08K2003/265C08L2205/02C08L2205/025C08L2205/035C08L2205/06C08L2207/53C09J11/04C09J11/08C09J109/00C09J163/00C08L63/00C08L9/02C08L75/08C08K13/04C08K7/26C08K3/22C08K3/26C08L9/00
Inventor 桑广艺钱立飞夏佳斌陶小乐何永富
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD
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