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Thixotropic solvent-free epoxy coating and preparation method thereof

An epoxy coating, solvent-free technology, applied in the direction of anti-corrosion coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of high hardness, poor flexibility, affecting adhesion, difficult to achieve, etc., to achieve good toughening modification effect, ensuring strength, and excellent anti-corrosion performance

Active Publication Date: 2019-05-07
珠海市威旗防腐科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still difficult to achieve a 2mm-5mm or thicker epoxy coating at one time while ensuring performance by using traditional methods.
Especially due to the high hardness and poor flexibility of the epoxy material itself, it is easy to cause cracking due to various reasons such as impact and bending after the construction reaches a thickness of more than 1mm, and there may be cases where the adhesion is affected due to cohesion. Therefore, it is necessary to toughen and modify it at the same time

Method used

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  • Thixotropic solvent-free epoxy coating and preparation method thereof
  • Thixotropic solvent-free epoxy coating and preparation method thereof
  • Thixotropic solvent-free epoxy coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] First, mix 20 parts of ethylene glycol diglycidyl ether with 15 parts of 3,3'-diethyl-4,4'-diaminodiphenylmethane, stir well, and then keep it at 60°C for 2 hours, then lower it to room temperature to obtain the improved Permanent epoxy resin for use; mix 100 parts of epoxy resin E51 with another 15 parts of ethylene glycol diglycidyl ether, and then add 0.5 parts of dispersant BNK-NSF163, 0.5 parts of dispersant BNK-NSF161, defoamer Tech 1.5 parts of -430, 1 part of carbon black, 20 parts of titanium dioxide, 20 parts of precipitated barium sulfate, 50 parts of gray micaceous iron oxide, after dispersion, grind to a fineness of 80 μm; then add the previous modified epoxy resin, stir evenly, Adjust the rotational speed to 200rpm, add 40 parts of isocyanate prepolymer, stir evenly, and then discharge the material to obtain a thixotropic solvent-free epoxy coating.

[0025] Among them, 20 parts of ethylene glycol diglycidyl ether is a binary epoxy resin, 3,3'-diethyl-4,4'...

Embodiment 2

[0027] First mix 20 parts of ethylene glycol diglycidyl ether with 20 parts Mix D-400, stir well, keep warm at 60°C for 3 hours, lower to room temperature to obtain modified epoxy resin for use; mix 100 parts of epoxy resin E51 with 10 parts of butyl glycidyl ether and 10 parts of polypropylene glycol diglycidyl ether Mix evenly, then add 0.5 parts of dispersant BNK-NSF163, 1.0 parts of defoamer Tech-430, 15 parts of red iron oxide, 80 parts of red mica iron oxide, and 30 parts of barite powder, disperse and grind to a fineness of 65 μm Then add the modified epoxy resin in front, and after stirring evenly, adjust the rotating speed to 300 rpm, add 30 parts of isocyanate prepolymer, stir evenly, and then discharge the material to obtain a thixotropic solvent-free epoxy coating.

[0028] Wherein, ethylene glycol diglycidyl ether is a binary epoxy resin, D-400 is binary polyether amine, butyl glycidyl ether and polypropylene glycol diglycidyl ether are reactive epoxy diluents,...

Embodiment 3

[0030] First mix 25 parts of epoxy resin E51 with 6.5 parts Mix D-230, stir well, keep warm at 70°C for 1 hour, lower to room temperature to obtain modified epoxy resin for later use; mix another 100 parts of epoxy resin E51 with 15 parts of C12~C14 alkyl glycidyl ether, and then Add 0.5 parts of dispersant BNK-NSF163, 2.0 parts of defoamer Tech-430, 15 parts of iron oxide red, 10 parts of talc powder, and 100 parts of barite powder, and grind to a fineness of 40 μm after dispersion; then add the previous modified ring Oxygen resin, after stirring evenly, add 10 parts of isocyanate prepolymer when the rotation speed is adjusted to 300rpm, stir evenly, and then discharge, to obtain a thixotropic solvent-free epoxy coating.

[0031] Among them, 25 parts of epoxy resin E51 is binary epoxy resin, D-230 is binary polyether amine, C12~C14 alkyl glycidyl ether is active epoxy diluent, BNK-NSF163 is dispersant, Tech-430 is defoamer, iron oxide red, talc powder and barite powder Fo...

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Abstract

The invention discloses a thixotropic solvent-free epoxy coating and a preparation method thereof, and relates to a coating and a preparation method thereof. The thixotropic property of the thixotropic solvent-free epoxy coating is provided by polyurea generated by reaction of modified epoxy resin and an isocyanate prepolymer, wherein the polyurea has the following molecular structure as shown inthe specification.

Description

technical field [0001] The invention relates to a paint and a preparation method thereof, in particular to a thixotropic solvent-free epoxy paint and a preparation method thereof. Background technique [0002] At present, the self-drying solvent-free epoxy coating widely used in the field of industrial heavy-duty anti-corrosion, under the condition of ensuring that the construction does not sag, the designed film thickness of one construction is usually 200-500 μm. When the film thickness requirement is high, the coating should have sufficient viscosity for construction, especially good thixotropic properties. The thixotropic properties of coatings are generally achieved by adding thixotropic agents. Traditional thixotropic agents mainly include fumed silica, polyamide wax and modified castor oil. In addition, some pigments and fillers also have good thixotropic properties. Denaturing thickening effect. From a technical point of view, there are several reasons that limit t...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D5/08C09D7/61C08G18/32C08G18/50C08G18/58
Inventor 郑如龙赖华生段自勤
Owner 珠海市威旗防腐科技股份有限公司
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