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Low-temperature-impact-resistant epoxy adhesive composition and preparation method thereof

A technology of epoxy adhesive and composition, applied in the direction of adhesive, epoxy resin, adhesive type, etc., can solve the problems of brittle cracking, poor toughness, brittleness, etc.

Active Publication Date: 2018-09-25
HANGZHOU ZHIJIANG SILICONE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the epoxy glue is cured, it is usually easy to be brittle and cracked under the action of external force because of its poor toughness.
The general toughening method can improve the toughness of the material at room temperature by adding a toughening agent, but at low temperature, the material with good toughness at room temperature will still become brittle

Method used

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  • Low-temperature-impact-resistant epoxy adhesive composition and preparation method thereof

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preparation example Construction

[0079] The present invention also provides a method for preparing the epoxy adhesive composition, which includes the following steps:

[0080] A) The epoxy resin is mixed and heated and melted to obtain an epoxy resin mixture;

[0081] B) Add bifunctional epoxy diluent, toughening agent, inorganic filler, dewatering agent, thixotropic agent, heat-activated latent curing agent and curing accelerator to the epoxy resin mixture, mix and stir, vacuum After deaeration, an epoxy adhesive composition is obtained.

[0082] In the present invention, the epoxy resin is first mixed and then heated and melted to obtain an epoxy resin mixture.

[0083] Specifically, the liquid epoxy resin is heated to 95-105°C, the solid epoxy resin is added, and the mixture is stirred until the solid epoxy resin melts to obtain an epoxy resin mixture;

[0084] Then, add bifunctional epoxy diluent, toughening agent, inorganic filler, dewatering agent, thixotropic agent, heat-activated latent curing agent and curing...

Embodiment 1

[0090] Example 1 Preparation of Toughening Agent A

[0091] Add 100 parts of polyether polyol (DL-2000D) with a molecular weight of 2000D to the reactor, dehydrate at 105°C for 30 minutes, then add 0.6 part of trimethylolpropane and 0.1 part of organotin catalyst, mix well, and add under nitrogen protection 26.5 parts of MDI, controlled temperature to 85-90°C, reacted for 2.0 hours under these conditions to obtain a prepolymer, and the mass percentage of -NCO group of the prepolymer was detected to be 3.3%. According to the molar ratio of the ketoxime group to the -NCO group of 1.1:1, 10.1 parts of butanone oxime was added, and the capping reaction was performed at 85-90°C for 1.5 hours. The content of the -NCO group in the product was detected to be zero, and the increase was obtained. Toughener A.

[0092] The number average molecular weight of the toughening agent A was 4,500, the weight average molecular weight was 11,000, and the dispersion index was 2.4.

Embodiment 2

[0093] Example 2 Preparation of Toughening Agent B

[0094] Add 200 parts of polyether polyol (DL 4000D) with molecular weight of 4000D to the reactor, dehydrate at 105°C for 30 minutes, then add 1.0 part of trimethylolpropane and 0.2 part of organotin catalyst to mix uniformly, add MDI28 under nitrogen protection The temperature is adjusted to 85-90°C, and the reaction is carried out for 2.5 hours under this condition to obtain a prepolymer. The content of -NCO group of the prepolymer is 1.9%. According to the molar ratio of the ketoxime group to the -NCO group of 1.1:1, 13 parts of cyclohexanone oxime were added, and the end-capping reaction was performed at 85-90°C for 1.5 hours. The content of the -NCO group in the product was detected as zero. Toughening agent B.

[0095] The number average molecular weight of the toughening agent B was determined to be 8,600, the weight average molecular weight was 22,000, and the dispersion index was 2.6.

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Abstract

The present invention provides a low-temperature-impact-resistant epoxy adhesive composition, which comprises: at least two epoxy resins; at least a bifunctional epoxy diluent; at least three toughening agents, wherein the toughening agents at least comprise a liquid rubber toughening agent having a core-shell structure, an epoxy resin modified nitrile butadiene rubber, and a ketoxime-terminated reactive polyurethane elastic prepolymer; at least an inorganic filler; at least a water removing agent; at least a thixotropic agent; at least a thermally-activated latent curing agent; and at least acuring accelerator. According to the present invention, the two different epoxy resins are used as the raw materials, and the composite toughening agent at least comprising the liquid rubber toughening agent having the core-shell structure, the epoxy resin modified nitrile butadiene rubber and the ketoxime-terminated reactive polyurethane elastic prepolymer is added, such that the obtained epoxyadhesive composition has good low-temperature-impact resistance.

Description

Technical field [0001] The invention belongs to the technical field of adhesives, and specifically relates to a low-temperature impact-resistant epoxy adhesive composition and a preparation method thereof. Background technique [0002] After the epoxy adhesive is cured, it is easy to be brittle under the action of external force because of its poor toughness. The general toughening method can improve the toughness of materials at room temperature by adding toughening agents, but at low temperatures, materials with good room temperature toughness will still become brittle. Summary of the invention [0003] In view of this, the technical problem to be solved by the present invention is to provide a low temperature impact resistant epoxy adhesive composition and a preparation method thereof. The low temperature impact resistant epoxy adhesive composition provided by the present invention has good low temperature impact resistance. [0004] The present invention provides a low-temperat...

Claims

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Application Information

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IPC IPC(8): C09J163/00C09J11/04C09J11/08
CPCC08L2205/025C08L2205/035C09J11/04C09J11/08C09J163/00C08L63/00C08L15/00C08L75/08C08K13/04C08K7/20C08K2003/265C08K3/36
Inventor 何永富桑广艺夏佳斌钱立飞
Owner HANGZHOU ZHIJIANG SILICONE CHEM
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