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Waterborne polyurethane-polyacrylic acid-based self-repairing stone-like coating and preparation method thereof

A water-based polyurethane, polyacrylic acid-based technology, applied in biocide-containing paints, antifouling/underwater coatings, coatings, etc., can solve problems affecting the decorative effect and functional service life of exterior wall coatings, cracks in paint films, etc. , to achieve the effect of strong self-healing and excellent performance

Inactive Publication Date: 2021-04-06
安徽科创美涂料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Real stone paint is often subject to mechanical damage and slight movement of the wall during use, resulting in cracks in the paint film, which affects the decorative effect, functionality and service life of the exterior wall paint

Method used

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  • Waterborne polyurethane-polyacrylic acid-based self-repairing stone-like coating and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0032] Such as figure 1 as shown, figure 1 It is a flow chart of the preparation method of the waterborne polyurethane-polyacrylic acid based self-repairing genuine stone paint. The preparation method of water-based polyurethane-polyacrylic acid base self-repairing genuine stone paint of the present invention comprises steps:

[0033] S1, put deionized water into the tank, start the disperser, stir and disperse for 8 minutes to 10 minutes, adjust the pH to 8.0 to 10.0, stir and disperse for 5 minutes to 10 minutes;

[0034] S2, adding a water-based polyurethane-polyacrylic acid emulsion containing disulfide bonds and acylhydrazone bonds to the solution obtained in step S1, stirring and dispersing for 5 minutes to 10 minutes;

[0035] S3, adding water-based multifunctional additives, dispersants, film-forming aids, antifreeze agents, water-based defoamers, bactericides, water-repellent agents, and deionized water to the solution obtained in step S2, and stirring and dispersin...

Embodiment 1

[0070] The preparation of the described water-based polyurethane-polyacrylic acid emulsion containing disulfide bond and acylhydrazone bond:

[0071] A1, add 100 parts of polytetrahydrofuran diol into the reactor, and perform vacuum dehydration at 120°C for 2 hours;

[0072] A2, under the protection of N2, lower the temperature to 80°C, add 44.5 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate, react at 90°C for 3 hours, and adjust the viscosity with 40 parts of N-methylpyrrolidone;

[0073] A3, lower the temperature to 70°C, add 8 parts of sodium N-(2-aminoethyl)-2-aminoethanesulfonate and react for 3 hours;

[0074] A4, cool down to 50°C and add 10 parts of 4,4′-diaminodiphenylsulfide and 8 parts of quinone oxime hydrazone to react for 2 hours;

[0075] A5, add 10 parts of hydroxyethyl methacrylate (HEMA), and keep the temperature at 90°C;

[0076] A6, add 10 parts of acrylic acid (AA), 20 parts of acrylate, 30 parts of methyl methacrylate, add a tot...

Embodiment 2

[0089] The preparation of the aqueous polyurethane emulsion containing disulfide bond and acylhydrazone bond:

[0090] A1, add 100 parts of polycaprolactone diol into the reactor, and perform vacuum dehydration at 120°C for 2 hours;

[0091] A2, in N 2 Under protection, lower the temperature to 70°C, add 50 parts of 4,4-diphenylmethane diisocyanate (MDI) and 0.02 parts of stannous octoate, react at 85°C for 3 hours, and adjust the viscosity with 40 parts of 20ml dioxane;

[0092] A3, cool down to 70°C, add 10 parts of sodium ethylenediaminoethanesulfonate to react for 3 hours;

[0093] A4, heat up to 50°C and add 10 parts of 4,4′-dihydroxydiphenyl sulfide and 7 flufenzole, and react for 3 hours;

[0094] A5, add 10 parts of hydroxyethyl acrylate (HEA), and keep the temperature at 90°C;

[0095] A6, add 10 parts of acrylic acid (AA), 20 parts of methyl methacrylate, 20 parts of styrene, add a total of 0.010 parts of azobisisobutyronitrile in batches, each interval of 10 minu...

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Abstract

The invention discloses a waterborne polyurethane-polyacrylic acid-based self-repairing stone-like coating and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing a polyurethane prepolymer containing disulfide bonds and acylhydrazone bonds, conducting terminating by hydroxyethyl acrylate to prepare a polyurethane prepolymer with double bonds, and then carrying out free radical copolymerization with acrylic acid to obtain carboxyl-containing polyurethane; and finally, conducting emulsifying and salifying to obtain waterborne polyurethane-polyacrylic acid emulsion containing disulfide bonds and acylhydrazone bonds, then sequentially adding an auxiliary, a dispersing agent, a film-forming aid, an anti-freezing agent, a defoaming agent, a sterilizing agent, a water repellent, a thickening agent, deionized water and colored sand, and uniformly conducting mixing to obtain the waterborne polyurethane-polyacrylic acid-based self-repairing stone-like coating. According to the stone-like coating prepared by the preparation method disclosed by the invention, damage is repaired for multiple times by utilizing reversible reaction chemical bonds of disulfide bonds and acylhydrazone bonds and the hydrogen bond action of polyurethane-polyacrylic acid, and the stone-like coating has strong self-repairing force, can self-heal cracks and has a damaged coating; and the wear resistance, the low temperature resistance, the mildew resistance, the antibacterial property, the impact resistance and the like are excellent.

Description

technical field [0001] The invention relates to the technical field of real stone paint, in particular to a water-based polyurethane-polyacrylic acid based self-repairing real stone paint and a preparation method thereof. Background technique [0002] Real stone paint is a kind of polymer emulsion as the base material, adding a small amount of film-forming additives as the bonding material, using natural colored sand with different colors and meshes as the aggregate, and adding a series of additives and deionized water quantitatively. A polymer emulsion sand-wall-like high-build coating system prepared by physical uniform blending. [0003] Real stone paint is often subject to mechanical damage and slight movement of the wall during use, resulting in cracks in the paint film, which affects the decorative effect, functionality and service life of the exterior wall paint. [0004] In view of the above-mentioned defects, the creator of the present invention has finally obtaine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/14C09D7/65C08G18/66C08G18/48C08G18/42C08G18/67C08G18/32C08F283/00C08F220/06C08F220/10C08F220/14C08F212/08
CPCC09D1/00C09D5/14C09D7/65C08G18/6685C08G18/4854C08G18/3855C08G18/3868C08G18/672C08G18/6651C08G18/4277C08G18/4825C08F283/008
Inventor 胡先海高先银张静
Owner 安徽科创美涂料科技股份有限公司