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Room-temperature long-acting stable high-strength structural adhesive film and preparation method thereof

A technology with high strength structure and high stability, used in adhesives, epoxy resin adhesives, film/sheet adhesives, etc. Effect

Inactive Publication Date: 2021-06-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many kinds of mercapto compounds with great differences in reactivity. To obtain a long-term storage-stable structural adhesive film requires specific molecular structure design.

Method used

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  • Room-temperature long-acting stable high-strength structural adhesive film and preparation method thereof
  • Room-temperature long-acting stable high-strength structural adhesive film and preparation method thereof
  • Room-temperature long-acting stable high-strength structural adhesive film and preparation method thereof

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Embodiment Construction

[0027] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific examples.

[0028] The raw materials used in the experiments in the embodiments of the present invention and comparative examples are as follows, but are not limited to the following raw materials. The present invention is only the following raw materials as specific examples to further specifically illustrate the effect of the room temperature long-term stable high-strength structural adhesive film described in this application:

[0029] Nitrile rubber modified epoxy resin: 2500g / mol, epoxy value 0.15×10 -2 mol / g.

[0030] Polyurethane modified epoxy resin: 3000g / mol, viscosity (30°C) 20Pa·s, epoxy value 0.15×10 -2 mol / g.

[0031] Multifunctional epoxy resin: ERMA-413, viscosity (30°C) 2.5Pa·s, epoxy value 1.05×10 -2 mol / g.

[0032] Polymercapto compound: SMS-142, purchased from Ge...

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Abstract

The invention discloses a room-temperature long-acting stable high-strength structural adhesive film and a preparation method thereof, and belongs to the technical field of adhesives. The structural adhesive film is prepared from the following raw materials in parts by weight: 10-30 parts of nitrile rubber modified epoxy resin, 10-30 parts of polyurethane modified epoxy resin, 20-30 parts of polyfunctional epoxy resin, 2-6 parts of a multi-sulfhydryl compound, 10-15 parts of tackifying resin, 10-60 parts of inorganic filler, 2-4 parts of a curing agent and 1-3 parts of an accelerant. The nitrile rubber modified epoxy resin is prepared from carboxyl-terminated liquid nitrile rubber and bisphenol epoxy resin, the number-average molecular weight is 1500-6500 g / mol, and the epoxy value is 0.05-0.3 * 10 <-2 > mol / g. The polyurethane modified epoxy resin is prepared from a polyurethane prepolymer and aliphatic epoxy resin, the number-average molecular weight is 2000-4000 g / mol, the viscosity (30 DEG C) is greater than 20 Pa.s, and the epoxy value is 0.1-0.4 * 10 <-2 > mol / g. The epoxy resin is cured and crosslinked with polyfunctional alicyclic epoxy resin and a multi-sulfhydryl compound at high temperature, and can be stably stored at normal temperature. The curing peel strength is high, and various complex working conditions can be dealt with.

Description

technical field [0001] The invention relates to a long-term stable high-strength structural adhesive film at room temperature and a preparation method thereof, belonging to the technical field of adhesives. Background technique [0002] In the fields of aerospace, rail vehicles, ships, and automobiles, structural adhesives are required to bond load-bearing structural parts. During actual use, they experience complex working conditions such as high and low temperature, humidity alternation, vibration, and salt spray. Therefore, structural adhesives should be used in the above conditions. Keep the intensity high. At present, there are epoxy resin, bismaleic resin and cyanate resin structural adhesive films on the market, which can meet the application requirements in terms of mechanical strength, but the products need to be stored at low temperature, which brings great harm to storage, transportation and use. inconvenient. [0003] Mercapto groups can chemically react with e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/30C09J7/10C09J163/00C08G59/66
CPCC09J7/30C09J7/10C09J163/00C08G59/66C08L2205/035C08L2205/025
Inventor 李禹函魏柳荷朱军刘兴江李亚起
Owner ZHENGZHOU UNIV