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Self-repair polyurethane (PU) residual rust paint and preparation method thereof

A self-repairing technology for rusty coatings, applied in the field of coatings, to achieve good storage stability, good dispersion and compatibility

Active Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the compatibility problem between phosphoric acid and solvent-based coating components, and the problem that phosphoric acid is easy to cause coating foaming, the present invention proposes a polyurethane self-repairing tape Rust coating and preparation method thereof, the purpose is to prepare a durable coating for rust coating on the surface of corroded metal substrates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] Preparation of coated solid phosphoric acid composition:

[0037] Add 40kg of coupling agent, 40kg of metaphosphoric acid, and 40kg of zinc dihydrogen phosphate into the container, stir at 1100rpm for 0.5h, then put it into a ball mill and grind for 10h, until the fineness is 35 microns. The material is then filtered, dried at 100° C. for 6 hours, ground, and passed through a 325-mesh sieve to obtain a coated solid phosphoric acid composition.

[0038] Preparation of polyurethane self-repairing rust coating:

Embodiment 1

[0045] Add 63kg Desmophen 680 resin (solid content 70%) into the reaction kettle, then add 0.3kg Disperbyk-107 dispersant, 0.3kg BORCHIGEL THIXO Z anti-settling agent, 14.1kg propylene glycol methyl ether acetate, 5.3kg above Coating solid phosphoric acid composition and 17kg titanium dioxide, stirring for 40 minutes.

[0046] These resin mixtures are ground again to obtain component 1 of the polyurethane self-repairing rust coating;

[0047] In another reaction kettle, dissolve 50kg Desmodur N 75 BA curing agent in 50kg methyl amyl ketone to make component two of polyurethane self-repairing rust coating;

[0048]According to the ratio of component 1: component 2 = 100:42, add component 2 to component 1, and cure at room temperature for 7 days to form a polyurethane self-repairing rust coating.

Embodiment 2

[0050] Add 63kg Desmophen 680 resin (70% solid content) into the reaction kettle, and then add 0.3kg Disperbyk-107 dispersant, 0.3kg BORCHIGEL THIXO Z anti-settling agent, 18.6kg propylene glycol methyl ether acetate, 0.8kg The above coating solid phosphoric acid composition and 17kg titanium dioxide were stirred for 40 minutes.

[0051] Grinding the above-mentioned resin mixture to obtain component 1 of the polyurethane self-repairing rust coating;

[0052] In another reaction kettle, dissolve 50kg Desmodur N 75 BA curing agent in 50kg methyl amyl ketone to make component two of polyurethane self-repairing rust coating;

[0053] Add component two to component one according to the ratio of component one: component two = 100:42, and cure for 7 days at room temperature to form a polyurethane self-repairing rust coating.

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PUM

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Abstract

The invention provides self-repair polyurethane (PU) residual rust paint and a preparation method thereof. The self-repair PU residual rust paint comprises synthetic resin, a solid phosphoric acid composition, auxiliaries, solvents, curing agents and the like. The preparation method is characterized by coating the solid phosphoric acid composition by utilizing a coupling agent and then preparing the self-repair PU residual rust paint with the coated solid phosphoric acid composition. The paint has very strong rust layer transformation capacity and can be widely applied to anti-corrosion construction of steel structure parts on which rust layers are difficult to completely remove.

Description

[0001] technical field [0002] The invention relates to a preparation method of a polyurethane self-repairing rust-bearing coating, which belongs to the technical field of coatings. Background technique [0003] Most of the rusty coatings in the past contain chromate or chromic acid coordination compounds. When these compounds are hydrolyzed, heteropolyacids are formed. The heteropolyacids react with rust to form stable complexes that inhibit rust growth. Disclosed as CN101698776A is a kind of band rust coating for oil well pipe, the raw material composition of this coating comprises alkyd resin, leveling agent, defoamer, dispersant, thickener, drier, anti-skinning agent, adhesion promoter , Iron oxide red powder, carbon black, zinc phosphate, calcium carbonate, rust inhibitor powder and solvent. Rust inhibitor powder is diphenylguanidine chromate. Due to the restriction of environmental regulations, the use of paints containing hexavalent chromium will be prohibited....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D175/08C09D175/04C09D5/08
Inventor 邓静伟赵康文唐囡张宇刘福春韩恩厚
Owner STATE GRID CORP OF CHINA
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