A kind of preparation method of modified epoxy resin and its application in heavy-duty anti-corrosion coating

An epoxy resin and liquid epoxy resin technology, applied in the field of coatings, can solve the problems of poor coating compactness, unsatisfactory anti-corrosion performance, poor adhesion between film-forming resin and metal, etc., so as to improve anti-corrosion performance and improve storage. Stability, the effect of improving dispersion stability

Active Publication Date: 2020-07-21
CHANGZHOU GUANGHUI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing polyurethane-modified epoxy resins are used to prepare heavy-duty anti-corrosion coatings, but the compactness of the coating is poor, and the adhesion between the film-forming resin and the metal is not good. When it is used to prepare heavy-duty anti-corrosion coatings, there are problems of unsatisfactory anti-corrosion performance. , which limits its application

Method used

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  • A kind of preparation method of modified epoxy resin and its application in heavy-duty anti-corrosion coating
  • A kind of preparation method of modified epoxy resin and its application in heavy-duty anti-corrosion coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of component A:

[0038] ①Synthesis of solvent-free hydroxyl-terminated epoxy resin:

[0039] Put 45 parts of low-molecular liquid epoxy resin, 25 parts of diglycidyl ether and 30 parts of monovalent secondary amine into the reaction kettle and stir. When the temperature is raised to 80°C, keep the temperature for 3 hours, cool and discharge to obtain the solvent-free end Hydroxy epoxy resin.

[0040] ②Pre-dispersion

[0041] Add 1 part of polyacrylate ammonium salt dispersant to the solvent-free hydroxyl-terminated epoxy resin prepared in step ① for pre-dispersion.

[0042] ③Prepare the finished product of component A:

[0043] Mix 2 / 3 of the total pre-dispersed solvent-free hydroxyl-terminated epoxy resin, 5 parts of 800-mesh zinc phosphate, and 0.2 parts of BYK-051 defoamer from BYK to form a color paste, and use a high-efficiency alloy horizontal Sand mill, equipped with superhard ceramic zirconium beads as the grinding medium, disperse until the...

Embodiment 2

[0047] (1) Preparation of component A:

[0048] ①Synthesis of solvent-free hydroxyl-terminated epoxy resin:

[0049] Put 55 parts of low-molecular-weight liquid epoxy resin, 25 parts of diglycidyl ether and 20 parts of monovalent secondary amine into the reaction kettle and stir. When the temperature is raised to 70 ° C, keep the temperature for 3 hours, cool and discharge to obtain the solvent-free end Hydroxy epoxy resin.

[0050] ②Pre-dispersion

[0051] Add 1.5 parts of polyacrylate ammonium salt dispersant to the solvent-free hydroxyl-terminated epoxy resin prepared in step ① for pre-dispersion.

[0052]③Prepare the finished product of component A:

[0053] Mix 2 / 3 of the total pre-dispersed solvent-free hydroxyl-terminated epoxy resin, 8 parts of 1250-mesh aluminum tripolyphosphate, and 0.2 parts of BYK-051 defoamer from BYK to form a color paste, and use high-efficiency alloy Horizontal sand mill, equipped with superhard ceramic zirconium beads as the grinding mediu...

Embodiment 3

[0058] (1) A component is prepared according to the following steps:

[0059] ①Synthesis of solvent-free hydroxyl-terminated epoxy resin:

[0060] Put 60 parts of low-molecular-weight liquid epoxy resin, 20 parts of diglycidyl ether and 20 parts of monovalent secondary amine into the reaction kettle and stir. When the temperature is raised to 65 ° C, keep the temperature for 3 hours, cool and discharge to obtain the solvent-free end Hydroxy epoxy resin.

[0061] ②Pre-dispersion

[0062] Add 1.5 parts of polyacrylate ammonium salt dispersant to the solvent-free hydroxyl-terminated epoxy resin prepared in step ① for pre-dispersion.

[0063] ③Prepare the finished product of component A:

[0064] Mix 2 / 3 of the total pre-dispersed solvent-free hydroxyl-terminated epoxy resin, 8 parts of 1250-mesh aluminum tripolyphosphate, and 0.2 parts of BYK-051 defoamer from BYK to form a color paste, and use high-efficiency alloy Horizontal sand mill, equipped with superhard ceramic zircon...

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Abstract

The invention discloses a preparation method of modified epoxy resin and an application of the modified epoxy resin to a heavy anti-corrosion coating. The method includes the steps: by the aid of a multi-step feeding process, firstly, performing terminal hydroxyl modification on the epoxy resin; secondly, adding aliphatic isocyanate to perform modification; finally, adding diethanol amine to stopreaction to prepare polyurethane modified epoxy resin. The modified epoxy resin is used for the heavy anti-corrosion coating, compactness of an epoxy resin heavy anti-corrosion coating layer can be improved, cohesive property between film-forming resin and metal can be improved, and an anti-corrosion coating with better corrosion resistance is prepared.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a preparation method of modified epoxy resin and its application in heavy-duty anti-corrosion coatings. Background technique [0002] Various large-scale bridges, buildings, vehicles, machinery and equipment and other public facilities and production equipment made of steel are corroded by water, oxygen, sulfur, chlorine and other compounds in nature all the time, and are caused by steel rust every year. The economic losses amount to tens of billions of dollars; in order to protect steel from corrosion, coating anti-corrosion coatings is an important measure to prevent corrosion, such as: Chinese patent CN86104711 discloses an anti-corrosion coating and process, using epoxy modified chlorine chloride Butadiene rubber is the main film-forming substance, cyclohexanone and butyl acetate are solvents, mica iron oxide and red lead powder are antirust pigments, and T31 is used as a cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/65C08G18/58C08G18/32C09D163/00C09D175/04C09D5/08C09D7/61C09D7/80
CPCC08G18/3275C08G18/584C08G18/6535C08L2205/03C09D5/08C09D7/61C09D7/80C09D163/00C08L75/04C08L79/02C08K3/346
Inventor 赵绍洪蒋南昌殷立平贾梦秋周文佩刘志文
Owner CHANGZHOU GUANGHUI CHEM
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