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Low surface treatment waterborne epoxy primer for steel structure and preparation method of primer

A low surface treatment, water-based epoxy technology, applied in the field of coatings, can solve problems such as poor coating, easy oxidation and alkali resistance of the coating film, yellowing of epoxy coatings, etc. , good effect of yellowing resistance

Inactive Publication Date: 2017-03-15
ANHUI KINGYOUNG STRUCTURAL METAL WORK
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, since the phenolic hydroxyl group -OH in the cardanol molecule does not participate in the reaction, the modified curing agent contains phenolic hydroxyl groups of weak acids, making the coating film easy to be oxidized and poor in alkali resistance, easy to absorb ultraviolet light, and copolymerize. Yellowing of cured epoxy coatings is particularly severe

Method used

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Experimental program
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Embodiment Construction

[0023] A low surface treatment water-based epoxy primer for steel structures, which is composed of the following raw materials in parts by weight (kg): epoxy resin 58, cardanol 18, formaldehyde solution 20, isophorone diamine 22, KH550 3, concave-convex Clay clay 6, 1mol / L hydrochloric acid solution, benzyl triethylammonium chloride 1.2, 30% sodium hydroxide solution 18, deionized water, stearamide 2, epoxy diluent 4, talcum powder 4, Iron red 3, organic bentonite 6.

[0024] Specific steps are as follows:

[0025] (1) Attapulgite-modified cardanol:

[0026] ①. Add attapulgite to KH550 aqueous solution, adjust the pH to 3.5 with 1mol / L hydrochloric acid solution, stir at room temperature for 16 hours, then wash with deionized water, centrifuge at 2000r / min, vacuum dry, crush, and pass through 200 mesh sieve, spare;

[0027] ②. Add cardanol, benzyltriethylammonium chloride and modified attapulgite into the reaction flask, stir at 80°C for 4 hours, cool to 60°C, and add 30% s...

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Abstract

The invention discloses a low surface treatment waterborne epoxy primer for a steel structure. The low surface treatment waterborne epoxy primer comprises, by weight, 50-70 parts of epoxy resin, 16-21 parts of cardanol, 14-23 parts of formaldehyde solution, 18-25 parts of isophorone diamine, 2-4 parts of KH550, 3-8 parts of attapulgite, an appropriate amount of 1mol / L hydrochloric acid solution, 0.6-1.5 parts of benzyltriethylammonium chloride, 15-20 parts of 30% sodium hydroxide solution, an appropriate amount of deionized water, 1-2 parts of stearic amide, 1-5 parts of epoxy diluents, 3-6 parts of talcum powder, 2-5 parts of iron oxide red and 4-8 parts of organic bentonite. Silicon hydroxyl on the surface of attapulgite and cardanol are subjected to etherification and crosslinking reaction, a modified cardanol aldehyde amine curing agent is prepared by chemical reaction and has the advantages of general cardanol amide curing agents and the attapulgite, and a prepared epoxy coating has the advantages of good yellowing resistance, low-temperature curing and excellent corrosion resistance.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a low-surface-treatment water-based epoxy primer for steel structures and a preparation method thereof. Background technique [0002] In recent years, the coatings industry in various countries in the world has stepped up research on environmentally friendly coatings with low VOC emissions. Water-based anti-corrosion coatings have greatly reduced or even completely eliminated VOC emissions, and are safe and convenient to use, so as to develop rapidly. The base polymer emulsion used in one-component water-based anti-corrosion coatings is mostly thermoplastic, and the coating film hardness, medium resistance, pollution resistance and other properties are difficult to reach the level of solvent-based industrial coatings. Therefore, in recent years, people have begun to devote themselves to the research of two-component water-based anticorrosion coatings. The two-component water-based epoxy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D7/12C08G59/40C08G16/02
CPCC08G16/0206C08G16/0212C08G59/4085C08K3/34C08K9/00C08K13/06C09D5/08C09D5/18C09D7/62C09D163/00
Inventor 章阳
Owner ANHUI KINGYOUNG STRUCTURAL METAL WORK
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