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Epoxy-acid anhydride coating capable of being cured and used at room temperature and preparation method of coating

A room temperature curing and acid anhydride technology, which is applied in the direction of epoxy resin coatings, carboxyl rubber coatings, rubber derivative coatings, etc., can solve the problems of not meeting engineering needs, limited reduction of curing temperature, long curing time, etc., to avoid Effect of interface peeling, reduction of production cost, and expansion of application range

Inactive Publication Date: 2019-11-01
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, there are few studies on reducing the curing temperature of the epoxy-anhydride system, and the degree of reduction in the curing temperature is limited. The curing time of the system that can be cured at room temperature is longer, which cannot meet the needs of engineering.

Method used

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  • Epoxy-acid anhydride coating capable of being cured and used at room temperature and preparation method of coating
  • Epoxy-acid anhydride coating capable of being cured and used at room temperature and preparation method of coating

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Heat and melt 647 acid anhydride at 50℃~65℃ for later use. Mix 60 parts of E-51 epoxy resin, 20 parts of 711 epoxy resin, and 20 parts of bisphenol A type episulfide resin, heat and melt at 120 ° C ~ 150 ° C, after cooling to room temperature, sequentially mix 121 polysulfide rubber (Molecular weight 1000) 20 parts, 30 parts of hydroxy-terminated nitrile rubber, 70 parts of 647 anhydride, and 100 parts of solvent are added to the batching container, wherein ethyl acetate: cyclohexanone: butanol = 50: 30: 20, after stirring and mixing , and filter to remove impurities to obtain an epoxy-anhydride coating that can be cured at room temperature. Cured at 20°C for 48 hours, the tensile strength of the coating was 67.3MPa, and the bonding force of the coating to the Ly-12 aluminum alloy substrate was 15.2MPa. After removing the solvent from the coating of Example 1 in vacuum, it was characterized by differential scanning (DSC) method, the test temperature was -50°C to 200°C,...

Embodiment 2

[0032] Heat and melt 647 acid anhydride at 50℃~65℃ for later use. Mix 50 parts of E-51 epoxy resin, 20 parts of 680 epoxy resin, and 30 parts of bisphenol A type episulfide resin, heat and melt at 120 ° C ~ 150 ° C, after cooling to room temperature, sequentially add 121 liquid polysulfide 41.5 parts of rubber (molecular weight 1000), 20 parts of polyurethane prepolymer (molecular weight 6000) of polyethylene glycol 600 and 4,4'-diphenylmethane diisocyanate (MDI), 20 parts of 647 anhydride, 40 parts of 70 anhydride, solvent Add 150 parts into the batching container, wherein ethyl acetate: cyclohexanone: butanol = 50:30:20, stir and mix evenly, and filter through a filter to remove impurities to obtain an epoxy-anhydride coating that can be cured at room temperature. Cured at 20°C for 48 hours, the tensile strength of the coating was 61.8MPa, and the bonding force of the coating to the Ly-12 aluminum alloy substrate was 17.1MPa.

Embodiment 3

[0034]Heat and melt tetrahydrophthalic anhydride at 70°C to 90°C for later use. Mix 50 parts of E-44 epoxy resin, 25 parts of 711 epoxy resin, and 20 parts of bisphenol A episulfide resin, heat and melt at 120 ° C ~ 150 ° C, cool to room temperature, and sequentially mix 121 liquid polysulfide 50 parts of rubber (molecular weight 2000), 30 parts of polyurethane prepolymer (molecular weight 6000) of polyethylene glycol 600 and 4,4'-diphenylmethane diisocyanate (MDI), 20 parts of tetrahydrophthalic anhydride, 70 parts Add 27 parts of acid anhydride and 200 parts of solvent into the batching container, wherein ethyl acetate: cyclohexanone: butanol = 60:20:20, stir and mix evenly, filter through a filter to remove impurities and obtain epoxy resin that can be cured at room temperature. - Anhydride coatings. Cured at 20°C for 48 hours, the tensile strength of the coating was 62.7MPa, and the bonding force of the coating to the Ly-12 aluminum alloy substrate was 14.7MPa.

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Abstract

The invention discloses an epoxy-acid anhydride coating capable of being cured at room temperature and a preparation method of the coating. The formula of the coating comprises the following raw materials in parts by weight: 70-80 parts of epoxy resin, 20-30 parts of episulfide resin, a sulfydryl compound with a sulfydryl mole number of 0.10-0.30 of an epoxy mole number of the epoxy resin, an acidanhydride with an acid anhydride mole number of 0.7-1.0 of a sum of the epoxy mole number of the epoxy resin and the episulfide mole number of the episulfide resin, 20-50 parts of a toughening agent,and 100-300 parts of a solvent. According to the coating provided by the invention, the problem that an epoxy acid anhydride coating needs to be cured at a high temperature is solved, the tensile strength of a room-temperature cured coating layer is greater than 60 MPa, the binding force of the room-temperature cured coating layer on a Ly12 aluminum alloy substrate is greater than 12 MPa, the coating has good adhesive force on materials such as metals and engineering plastics, and the application range of the epoxy-acid anhydride coating is expanded.

Description

technical field [0001] The invention relates to the technical field of epoxy-acid anhydride coating, in particular to an epoxy-anhydride coating capable of curing at room temperature and a preparation method thereof. Background technique [0002] Epoxy resin has good electrical insulation, dimensional stability, oil resistance and chemical corrosion resistance, etc., and has been widely used in electronic appliances, aerospace, construction, machinery and other fields. The epoxy system cured by acid anhydride has the advantages of low toxicity, high glass transition temperature, low moisture absorption, low volatility, etc., small curing shrinkage, excellent heat resistance and electrical insulation performance, and is widely used in the electronic and electrical industry. However, acid anhydride curing agents require a higher curing temperature (usually above 100°C) and a longer curing time, so they are not conducive to on-site construction, and are not suitable for coating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D163/00C09D181/04C09D115/00C09D175/08C09D133/14C09D113/00C09D5/25
CPCC08L2201/08C08L2205/025C08L2205/035C09D163/00C08L63/00C08L81/04C08L15/00C08L75/08C08L33/14C08L13/00
Inventor 廖宏梁书恩王胜男罗琳琳康彪肖培双韩建军张超
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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