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Carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and preparation method and application thereof

A technology for epoxy coatings and prepolymers, applied in epoxy resin coatings, anti-corrosion coatings, coatings, etc., can solve problems such as poor compatibility, difficult migration of fluorine-containing groups, and difficulty in realizing molecular composites.

Active Publication Date: 2015-07-22
国科广化(南雄)新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of physical blending has poor compatibility between organic fluoropolymers and epoxy coatings, phase separation occurs, and it is difficult to achieve molecular-level recombination; and the addition of small-molecule fluorine-containing reactive monomers is easy to be absorbed due to short fluorine-containing chains. Embedded, fluorine-containing groups are difficult to migrate to the surface of the material, in order to achieve the desired modification effect, it is necessary to add a large amount of fluorine-containing monomers

Method used

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  • Carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and preparation method and application thereof
  • Carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and preparation method and application thereof
  • Carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of carboxyl-terminated fluorine-containing prepolymer: Add 20 parts by mass of hexafluorobutyl methacrylate and 40 parts by mass of dioxane into a container, heat up to 85°C, add 1 part by mass of thioglycolic acid, azo 0.6 parts by mass of diisobutyronitrile was stirred and reacted for 7 hours to obtain a carboxyl-terminated fluorine-containing prepolymer solution, and the solvent was distilled off under reduced pressure to obtain a carboxyl-terminated fluorine-containing prepolymer. FT-IR (Bruker TENSOR27 (Germany) Fourier transform infrared spectrometer) at 3279~3658cm -1 with 1730cm -1 There are COOH and C=O absorption peaks respectively, 1 HNMR (deuterated DMSO as solvent) at 12.2ppm the proton absorption peak of COOH appeared, indicating the terminal carboxyl group of the product.

[0052] (2) Preparation of carboxyl-terminated fluorine-containing prepolymer modified epoxy coating: 10 mass parts of carboxyl-terminated fluorine-containing prepolym...

Embodiment 2

[0054] (1) Preparation of carboxyl-terminated fluorine-containing prepolymer: add 20 parts by mass of trifluoroethyl methacrylate and 40 parts by mass of butanone into a container, heat up to 78° C., add 4 parts by mass of 3-mercaptopropionic acid, 0.8 parts by mass of nitrogen diisoheptanonitrile was stirred and reacted for 6 hours to obtain a carboxyl-terminated fluorine-containing prepolymer solution, and the solvent was distilled off under reduced pressure to obtain a carboxyl-terminated fluorine-containing prepolymer. FT-IR at 3279~3658cm -1 with 1730cm -1 There are COOH and C=O absorption peaks respectively, 1 HNMR (deuterated DMSO as solvent) at 12.2ppm the proton absorption peak of COOH, indicating that the end of the product contains a carboxyl group.

[0055] (2) Preparation of modified epoxy coating with carboxyl-terminated fluorine-containing prepolymer: add 5 parts by mass of the carboxyl-terminated fluorine-containing prepolymer prepared in step (1) to 100 part...

Embodiment 3

[0057] (1) Preparation of carboxyl-terminated fluorine-containing prepolymer: Add 40 parts by mass of dodecafluoroheptyl methacrylate and 40 parts by mass of ethylene glycol dimethyl ether into a container, heat up to 85°C, and add 2-mercaptopropionic acid 0.6 parts by mass, 0.1 parts by mass of azobisisobutyronitrile, stirred and reacted for 8.5 hours to obtain a carboxyl-terminated fluorine-containing prepolymer solution, and the carboxyl-terminated fluorine-containing prepolymer was obtained after the solvent was distilled off under reduced pressure. FT-IR at 3266~3690cm -1 with 1735cm -1 There are COOH and C=O absorption peaks respectively, 1 HNMR (deuterated DMSO as solvent) at 12.2ppm the proton absorption peak of COOH, indicating that the end of the product contains a carboxyl group.

[0058] (2) Preparation of carboxyl-terminated fluorine-containing prepolymer modified epoxy coating: add 0.1 mass parts of carboxyl-terminated fluorine-containing prepolymer prepared in...

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Abstract

The invention discloses a carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and a preparation method and application thereof and belongs to the field of polymer coatings. The modified epoxy coating contains the following components in parts by weight: 0.1-30 parts by mass of a carboxyl-terminated fluorine-containing prepolymer, 100 parts by mass of epoxy resin, 80-100 parts by mass of a curing agent, 0.5-2.5 parts by mass of an accelerant and 0.5-1 part by mass of a leveling agent. The modified epoxy coating is prepared by compounding the carboxyl-terminated fluorine-containing polymer and epoxy (methyl) acrylate, has the advantages of low surface energy, good adhesion, high hardness, acid-alkali resistance and the like, and can be applied in coating of metal parts and coating of electric parts.

Description

technical field [0001] The invention belongs to the field of polymer coatings, and in particular relates to a carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and a preparation method and application thereof. Background technique [0002] Epoxy resin coatings have excellent mechanical properties and good adhesion to many substrates, so they are widely used in anti-corrosion, electromechanical industry, transportation and other fields. However, epoxy resin coatings have problems such as poor water resistance, acid and alkali resistance, especially epoxy resin has high surface tension, which limits its application in the field of superhydrophobic self-cleaning coatings. [0003] Fluoropolymers have low surface energy and are widely used in the preparation of hydrophobic and oleophobic coatings; and they also have excellent chemical resistance. Composite modification of fluorine-containing polymers and epoxy resin coatings, especially at the molecular ...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D163/02C09D7/12C08G59/40
CPCC08F120/22C08G59/42C08L2205/03C08L2205/035C09D5/08C09D163/00C08L33/16C08L1/14C08L83/04
Inventor 刘伟区谭建权
Owner 国科广化(南雄)新材料研究院有限公司
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