Technological method of preparation of self-emulsified waterborne epoxy coating

A water-based epoxy coating and preparation technology, applied in the direction of epoxy resin coating, coating, etc., can solve the problems of unsatisfactory self-emulsification effect, poor weather resistance and salt water resistance, etc., so as to shorten the preparation time , Superior high temperature oxidation resistance, eliminating the effect of wear process

Inactive Publication Date: 2017-05-10
丹阳市海信涂料化工厂
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AI Technical Summary

Problems solved by technology

[0002] Water-based epoxy coatings were first widely used in the field of arrowheads, and then extended to steel structure anti-corrosion coatings. It is currently one of the most successful coatings in the field of industrial heavy-duty anti-corrosion, but its weather resistance and salt water resistance are not very good. Strong, requires frequent application to achieve good corrosion resistance
[0003] The main advantages of the self-emulsification method are: firstly, there is no demulsification phenomenon; secondly, it can be ground together with pigments and fillers to form a color paste, so that the toning part can be placed in both the curing agent part and the epoxy emulsion part. The paint-making performance of epoxy resin emulsion with external emulsifier is better, but the current self-emulsification effect is not very ideal

Method used

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preparation example Construction

[0020] A kind of preparation technology method of self-emulsifying waterborne epoxy paint, comprises the steps:

[0021] A. Grind the epoxy resin with a ball mill, colloid mill, or homogenizer, add an emulsifier to it, and stir vigorously to obtain an epoxy resin dispersion, and obtain a 6-12 μm nanoscale epoxy resin powder;

[0022] B. Adding the nano-scale epoxy resin obtained in the step A to an aqueous solution of an amidated polyamine emulsifier, and heating to obtain an epoxy resin water-based dispersion system;

[0023] C. Use the water-based epoxy resin prepared in the above steps A and B as the base material to prepare epoxy coatings. The specific steps include: (5-6) parts of acrylic acid and acrylate copolymers, (2-3) parts of curing agent, (1.2-2.2) parts of co-solvent and (35-45) parts of deionized water are added to (55-60) parts of epoxy resin water-based dispersion system;

[0024] D. In a temperature environment of 100-105° C., heat the mixed emulsion obt...

Embodiment 1

[0031] The formula is: 55 parts of water-based epoxy resin, 5 parts of acrylic acid and acrylate copolymer, 2 parts of amine curing agent, 1.2 parts of co-solvent and 35 parts of deionized water. When the ambient temperature is 101°C to 103°C, the obtained self-emulsifying water-based epoxy coating has a self-emulsifying efficiency of 99% and a self-emulsifying time of 5min-12min.

[0032] The water-based epoxy paint obtained from self-emulsification is subjected to the salt spray test and alkali resistance test stipulated in the national standard, and the parameter indexes are all higher than the existing indexes.

Embodiment 2

[0034]The formula is: 60 parts of water-based epoxy resin, 6 parts of acrylic acid and acrylate copolymer, 3 parts of curing agent, 2.2 parts of co-solvent and 45 parts of deionized water. When the ambient temperature is 102°C to 104°C, the obtained self-emulsifying water-based epoxy coating has a self-emulsifying efficiency of 100%, and the self-emulsifying time is 6min-12min.

[0035] The water-based epoxy paint obtained from self-emulsification is subjected to the salt spray test and alkali resistance test stipulated in the national standard, and the parameter indexes are all higher than the existing indexes.

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Abstract

The invention discloses a technological method of preparation of a self-emulsified waterborne epoxy coating, and the technological method comprises the following steps: A, epoxy resin is ground, an emulsifier is added to the ground epoxy resin, and stirring is conducted, so that an epoxy resin dispersion is obtained; B, the nanoscale epoxy resin obtained in the step A is added to an aqueous solution of an amidated polyamine emulsifier, and heating is conducted to obtain an epoxy resin aqueous dispersion system; C, by using the waterborne epoxy resin obtained through the step A and step B as a base material, the epoxy coating is prepared; D, a mixed emulsion obtained in the step C is heated at 100 to 105 DEG C for 15 to 30 minutes, so that a flaky semi-finished product is obtained; and E, the flaky semi-finished product obtained in the step D is ground, and testing and packing are conducted. The coating disclosed by the invention reduces the coating times and the cost of applying the coating to the steel structure products, extends the service life of the steel structure products and improves the weather resistance and salt-solution resistance.

Description

technical field [0001] The invention relates to the technical field of water-based epoxy paint preparation technology, in particular to a preparation method of self-emulsifying water-based epoxy paint. Background technique [0002] Water-based epoxy coatings were first widely used in the field of arrowheads, and then extended to steel structure anti-corrosion coatings. It is currently one of the most successful coatings in the field of industrial heavy-duty anti-corrosion, but its weather resistance and salt water resistance are not very good. Strong, requires frequent application to achieve good corrosion resistance. [0003] The main advantages of the self-emulsification method are: firstly, there is no demulsification phenomenon; secondly, it can be ground together with pigments and fillers to form a color paste, so that the toning part can be placed in both the curing agent part and the epoxy emulsion part. Adding an emulsifier-type epoxy resin emulsion has better paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D133/08C09D133/12C09D133/10C09D7/12
Inventor 黄新良
Owner 丹阳市海信涂料化工厂
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