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Nano hole sealing polyurethane coating and preparation process thereof

A polyurethane coating and sealing technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of long-term protection that needs further research, unsatisfactory interlayer adhesion, slow drying speed of sealing coatings, etc. The effects of chemical resistance and weather resistance, high surface activity, and excellent corrosion resistance

Inactive Publication Date: 2003-10-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the silicate compound, ethyl silicate or fluorine emulsion is used as the sealing coating, although the corrosion resistance of the zinc chromate water-based anti-corrosion treatment agent coating is increased to a certain extent, it is different from the zinc chromate The interlayer bonding force of the salt water-based anti-corrosion treatment agent coating is not ideal, and it is easy to peel off. The long-term protection of the metal substrate needs to be further studied, and the drying speed of this kind of sealing coating is slow, which affects the production efficiency, and often needs to be heated and cured. In the absence of heating and drying conditions, its curing is often impossible to achieve, so it is inconvenient to construct when limited by site conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the beaker of 300ml, claim 50g hydroxyl acrylic resin FX-2820 (solid content is 60%, and the hydroxyl content of solid resin is 2.8%), add above-mentioned Nanos type nano slurry 8g, then add xylene 12g, n-butyl acetate 12g, Add 5g of isophorone, 3g of chloroform, 3g of titanium dioxide, 2g of heavy calcium carbonate, 1g of iron oxide red, 1g of cadmium red, and 3g of talcum powder. The above-mentioned base material was dispersed with a high-speed disperser at 1000rpm for 10 minutes, then ground and dispersed with a sand mill for 1 hour, and filtered with a 200-mesh copper mesh to prepare a modified synthetic resin component for nano-sealed polyurethane coatings, wherein the nano-slurry accounted for the modified synthetic resin component. 8% of the total synthetic resin component; curing agent component is Desmudur  N75 (75% solids, 16.4% NCO). The two components are stirred according to the ratio of NCO: OH = 0.8: 1 (molar ratio), and then the nano-sealed polyuret...

Embodiment 2

[0025] Weigh 50g hydroxyacrylic resin FX-2820 (solid content is 60%, the hydroxyl content of solid resin is 2.8%) in the beaker of 300ml, add above-mentioned Nanos type nano slurry 0.2g, then add xylene 19.8g, n-butyl acetate 12g, isophorone 5g, chloroform 3g, then add titanium dioxide 3g, heavy calcium carbonate 2g, iron oxide red 1g, cadmium red 1g, talcum powder 3g. The above-mentioned base material was dispersed with a high-speed disperser at 1000rpm for 10 minutes, then ground and dispersed with a sand mill for 1 hour, and filtered with a 200-mesh copper mesh to prepare a modified synthetic resin component for nano-sealed polyurethane coatings, wherein the nano-slurry accounted for the modified synthetic resin component. 0.2% of the total amount of synthetic resin components; the curing agent component is Desmudur  N75 (75% solids, 16.4% NCO). The two components are stirred according to the ratio of NCO: OH = 0.8: 1 (molar ratio), and then the nano-sealed polyurethane c...

Embodiment 3

[0027] In the beaker of 300ml, claim 50g hydroxyl acrylic resin FX-2820 (solid content is 60%, and the hydroxyl content of solid resin is 2.8%), add above-mentioned Nanos type nano slurry 18g, then add xylene 2g, n-butyl acetate 12g, Add 5g of isophorone, 3g of chloroform, 3g of titanium dioxide, 2g of heavy calcium carbonate, 1g of iron oxide red, 1g of cadmium red, and 3g of talcum powder. The above-mentioned base material was dispersed with a high-speed disperser at 1000rpm for 10 minutes, then ground and dispersed with a sand mill for 1 hour, and filtered with a 200-mesh copper mesh to prepare a modified synthetic resin component for nano-sealed polyurethane coatings, wherein the nano-slurry accounted for the modified synthetic resin component. 18% of the total synthetic resin component; curing agent component is Desmudur  N75 (75% solids, 16.4% NCO). The two components are stirred according to the ratio of NCO: OH = 0.8: 1 (molar ratio), and then the nano-sealed polyure...

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Abstract

The present invention relates to a polyurethane paint with hole-sealing function, it is formed from two components of modified synthetic resin and solidifying agent which are matched each with other and used together. The described synthetic resin is formed from 0.1-20% of nano slurry, 30-70% of synthetic resin, 0-30% of pigment and the resit is solvent. Its preparation method includes the following steps: firstly, adding the nano slurry into synthetic resin solution, then adding the solvent, mixing then with pigment, dispersing and grinding, filtering to obtain modified synthetic resin, thenmatching it with solidifying agent to form the invented nano hole-sealing polyurethane paint.

Description

technical field [0001] The invention relates to nanotechnology and corrosion protection technology, in particular to a polyurethane coating with a sealing function and a preparation method thereof. Background technique [0002] Zinc-chromium coating (Dacromet coating), metal anodic oxide film, electroless coating, electroplating layer, phosphating film and passivation film have a certain protective effect on the metal. For example, US Patent No. 3,687,738 reports that a zinc-chromium coating has better corrosion resistance. Chromate conversion coating can prevent pitting corrosion of 2024-T3 aluminum alloy [G.O.Llevbare, J.R.Scully, et al.Inhibition of pitting corrosion on aluminum alloy 2024-T3: effect of soluble chromate additions vs chromate conversion coating.Corrosion, 2000, 56(3):227-242]. However, their corrosion resistance is often poor in acidic or alkaline media. This is because these coatings or films are microscopically porous. The ions of the corrosive mediu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04
Inventor 刘福春韩恩厚柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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