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Zinc-rich primer and preparation method thereof

A zinc-rich primer and zinc powder technology, applied in the field of coatings, can solve the problems of reduced cathodic protection capability, large particle size and environmental pollution of coatings, and achieve the effects of improving anti-corrosion performance, dense paint film and high safety.

Active Publication Date: 2014-05-21
XIAN HIGHWAY INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large particle size of several main components of the zinc-rich primer in the prior art, many large pores will be generated between the particles on the formed coating, and these pores provide channels for corrosive media such as water and salt spray to enter the steel The surface is corroded, so that the cathodic protection ability of the coating is greatly reduced
In addition, ordinary zinc-rich primers contain organic solvents, which will cause environmental pollution after volatilization.

Method used

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  • Zinc-rich primer and preparation method thereof
  • Zinc-rich primer and preparation method thereof
  • Zinc-rich primer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A component:

[0034]

[0035] The preparation method of the zinc-rich primer in this embodiment: first dissolve the epoxy resin in an organic solvent to form an epoxy resin solution, and then add other components in the A component except zinc powder to the epoxy resin solution, Fully grind until the silicon carbide in it is fully dispersed. Grind with a sand mill (Jiangsu Hongliu Chemical Machinery Co., Ltd., 20 liter sand mill) for 40 minutes, add the remaining zinc powder to the epoxy mixing system after grinding, and then Fully disperse with a high-speed disperser (Jiangsu Hongliu Chemical Machinery Co., Ltd.) until the zinc powder is fully dispersed in the mixed solution (about 40 minutes), which becomes component A.

Embodiment 2

[0037] A component:

[0038]

[0039] The preparation method of the zinc-rich primer in this embodiment: first dissolve the epoxy resin in an organic solvent to form an epoxy resin solution, and then add other components in the A component except zinc powder to the epoxy resin solution, Fully grind until the silicon carbide in it is fully dispersed. Grind with a sand mill (Jiangsu Hongliu Chemical Machinery Co., Ltd., 20-liter sand mill) for 45 minutes. Add the remaining zinc powder to the epoxy mixing system after grinding, and then use a high-speed The dispersing machine (Jiangsu Hongliu Chemical Machinery Co., Ltd.) fully disperses for 60 minutes until the zinc powder is fully dispersed in the mixed liquid, which becomes component A.

Embodiment 3

[0041] A component:

[0042]

[0043] The preparation method of the zinc-rich primer in this embodiment: first dissolve the epoxy resin in an organic solvent to form an epoxy resin solution, and then add other components in the A component except zinc powder to the epoxy resin solution, Fully grind until the silicon carbide in it is fully dispersed. Grind with a sand mill (Jiangsu Hongliu Chemical Machinery Co., Ltd., 20 liter sand mill) for 25 minutes, add the remaining zinc powder to the epoxy mixing system after grinding, and then Fully disperse with a high-speed dispersant until the zinc powder is fully dispersed in the mixed solution, which becomes component A.

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Abstract

The invention belongs to the field of coatings and provides a zinc-rich primer. The zinc-rich primer is composed of a component A and a component B, wherein the component A comprises the following components in parts by weight: 10-20 parts of epoxy resin, 60-80 parts of zinc powder, 5-20 parts of silicon carbide, 0.1-0.6 part of organic bentonite and 5-10 parts of allyl glycidyl ether; the component B comprises 5-30 parts of a polyamide curing agent or cashew nut shell oil by weight. According to the technical scheme, nano-grade fillers are added into an epoxy zinc-rich paint; the fillers can sufficiently fill up a gap formed between large spherical zinc grains so that a paint film of the epoxy zinc-rich paint is dense and the permeation of a corrosion medium is blocked, and furthermore, the anticorrosion property of the zinc-rich primer is greatly improved. Furthermore, the epoxy zinc-rich paint has no organic emissions and is an environment-friendly material.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a coating composition containing epoxy resin and its preparation. Background technique [0002] Zinc-rich primers protect the coated steel material electrochemically. Since zinc is more active than iron, it is easy to lose electrons. In the early stage of corrosion, zinc powder and steel substrate form a primary battery. The electrode potential of zinc is negative than that of iron. Zinc is the anode (usually called sacrificial anode), and iron is the cathode. , the current flows from zinc to iron, and the steel substrate is cathodically protected. [0003] The general zinc-rich primer is a special coating product composed of polymer resin, zinc powder, thickener, filler, auxiliary agent, solvent, etc. The paint has good anti-corrosion performance and strong adhesion, such as patent CN102417784A , with zinc powder as the main component, adding epoxy resin, methyl isobutanol, xylene, n-b...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D7/12
Inventor 石雄伟刘俊峰袁卓亚魏燕萍许冰柯亮亮冯威雷丹
Owner XIAN HIGHWAY INST
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