CN112322131A - Bright and super-weather-resistant adhesive paint for exterior wall and preparation method thereof - Google Patents
Bright and super-weather-resistant adhesive paint for exterior wall and preparation method thereof Download PDFInfo
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- CN112322131A CN112322131A CN202011409153.3A CN202011409153A CN112322131A CN 112322131 A CN112322131 A CN 112322131A CN 202011409153 A CN202011409153 A CN 202011409153A CN 112322131 A CN112322131 A CN 112322131A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
- C09D5/028—Pigments; Filters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a bright-color super-weatherability exterior wall latex paint and a preparation method thereof. Forming an anti-sticking paint film by using the water-based self-crosslinking pure acrylic emulsion; the sebacate light stabilizer weakens the damage of ultraviolet irradiation to the stability of a paint film and can inhibit the photo-oxidation of the paint film, thereby improving the damage loss of the physical properties of the coating due to the inhibition of gloss; the organic color paste has a protection effect on the stability of the organic color paste, so that the organic color paste has good light resistance and weather resistance, the flexibility, the adhesive force, the waterproofness and the brightness of the appearance of the coating are maintained, and finally, the durability and the service life of the coating are obviously improved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a bright-color super-weather-resistant exterior wall latex paint and a preparation method thereof.
Background
The exterior wall coating is exposed in the air for a long time and is blown by sunshine, rain and wind, the technical level requirements on the adhesiveness, weather resistance, stain resistance and scrub resistance of the exterior wall coating are higher and higher, and the exterior wall coating not only meets the requirements of excellent stain resistance products of GB9755-2014 synthetic resin emulsion exterior wall coating, but also meets the requirements of GB18582-2020 harmful substance limit in wall coating for buildings.
The self-crosslinking water-based acrylic coating is usually prepared by adding pigment, filler and auxiliary agent into self-crosslinking acrylic emulsion, has good decorative performance, gloss retention and color retention, has simple preparation method, convenient construction, low price and environmental protection, and is widely popularized and applied in the industrial weather-resistant field which mainly comprises solvent type coating. For example, chinese patent CN102604498B discloses a high stain-resistant and high weather-resistant water-based exterior wall latex paint and a preparation method thereof, wherein in the specification [ 0016 ] to [ 0020 ], a hydrophilic self-crosslinked pure acrylic emulsion is used as a binder base material, and compared with styrene-acrylic emulsion, the weather resistance of the latex paint is enhanced by the yellowing resistance of an acrylate structure and the enhanced compactness after film formation and crosslinking. Chinese patent CN102732079B discloses an exterior wall coating for buildings, which comprises emulsion base materials, pigments, fillers, solvents, film forming additives, auxiliary materials, water glass and viscosity stabilizers. However, self-crosslinking aqueous acrylic coatings tend to be insufficient in tinting strength and therefore are not bright enough in color and have poor durability.
On the other hand, with the pursuit of high-quality life, people have increasingly high requirements on the brightness and color durability of building exterior wall coatings. In the prior art, because inorganic color paste has better light resistance and weather resistance than organic color paste, the exterior wall latex paint color paste is basically added with the inorganic color paste, and the inorganic color paste is stable and easy to store in a latex paint formula system. However, inorganic color paste has poor tinting strength, so that the paint film is generally not bright and bright in color, and the latex paint added with the organic color paste has poor weather resistance and durability although the latex paint has gorgeous color.
Disclosure of Invention
The invention aims to provide a bright-color super-weather-resistant exterior wall latex paint and a preparation method thereof, which solve the problems of insufficient color brightness, insufficient paint film durability and the like of the super-weather-resistant acrylic latex paint.
In order to achieve the purpose, on one hand, the invention adopts the following specific technical scheme:
the bright and super-weather-resistant exterior wall latex paint comprises the following components in percentage by weight:
further, the paint comprises the following components in percentage by weight:
further, the optimal formula is preferred, and the bright-color ultra-weather-resistant exterior wall latex paint comprises 60% of acrylic emulsion; 18 percent of organic color paste; 0.6 percent of dispersant; 0.3% of wetting agent; 0.3 percent of defoaming agent; 0.2% of bactericide; 0.15 percent of mildew preventive; 0.2% of light stabilizer; 0.2% of a rheology modifier; the balance being pure water.
Further, the acrylic emulsion is a water-based self-crosslinking pure acrylic emulsion.
Further, the organic color paste is prepared by a block copolymer wetting dispersant which is a high molecular weight block copolymer solution containing pigment affinity groups.
Further, the light stabilizer is a sebacate-type light stabilizer.
Further, the light stabilizer is sebacate light stabilizer of nano-coating technology.
In order to achieve the above object, in another aspect, the present invention provides a method for preparing a bright and ultra-weather resistant exterior wall latex paint, comprising:
(1) adding pure water into a reaction kettle;
(2) adding pure acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding a dispersing agent, a wetting agent and 2/3 defoaming agent (in percentage by weight) at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring at the rotating speed of 600-800 rpms, adding the organic color paste, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and the bactericide, the mildew preventive and 1/3 defoamer (in percentage by weight) are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding a light stabilizer under a stirring state, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding the added rheology modifier under the stirring state, and stirring for 5 minutes;
(8) adding pure water, and stirring to obtain the final product.
The acrylic emulsion is composed of 100% pure acrylic emulsion, does not contain formaldehyde, alkylphenol polyoxyethylene ether compounds and diisononyl phthalate, and is aqueous self-crosslinking acrylic emulsion which meets the environmental standard. Its cross-linking property makes it possess high anti-contamination property, excellent adhesive force and water-proofing property, and possesses excellent outdoor durability, gloss retention property, blocking resistance and good scrubbing resistance. Has excellent adhesion to cement mortar, excellent durability, water resistance and excellent hydrolysis resistance and alkali resistance on the surface of the cement mortar. The extremely low surface tension reduces the surface energy of the paint film, the damage to the paint film caused by the adhesion of the paint film is avoided, and meanwhile, the adhered substances on the surface of the paint film are beneficial to being cleaned by water.
The organic color paste is prepared from organic pigment through a block copolymer wetting dispersant, wherein the wetting dispersant is a high molecular weight block copolymer solution containing pigment affinity groups, the organic pigment forms uniform and stable concentrated pigment paste with certain fluidity or thixotropic fluidity under the process, and the organic color paste enables a paint film to be bright in color, strong in tinting strength and stable in a formula system.
The light stabilizer is sebacate light stabilizer, preferably sebacate light stabilizer of nano-coating technology, and the active substance is ultraviolet light absorber, which can inhibit photo-oxidation of adhesive, improve the resistance of coating to gloss loss, chalking, cracking, delamination and color change, and remarkably improve the durability and service life of coating.
The dispersing agent is a 50% aqueous solution of sodium salt of sulfosuccinic acid diester, which is beneficial to uniform dispersion of the organic color paste in a formula system, increase of film gloss and color development and improvement of in-tank flooding and layering of the latex paint.
The wetting agent is an ethoxylated linear fatty alcohol mixture, which is beneficial to the stability of the dispersed organic color paste and finally solves the color difference change caused by temperature change.
The mildew preventive is n-octyl isothiazolinone mildew preventive, and is favorable for mildew resistance of a paint film.
The bactericide is benzisothiazolinone bactericide, and is favorable for in-tank storage of the coating.
The defoaming agent is polymer composite mineral oil, is beneficial to the application property of the coating, and does not influence the appearance of a paint film.
The leveling modifier is polyurethane, which is beneficial to the storage property (pseudo-thickening) and the application property of the emulsion paint and the surface smoothness of a paint film.
The working principle of the invention is as follows: 1. the waterborne self-crosslinking pure acrylic emulsion has crosslinking property, and can form a paint film with excellent anti-sticking property at lower ambient temperature without adding other film-forming aids and cosolvents; 2. the organic color paste is matched with the acrylic emulsion for use, and the prepared paint film has extremely low surface energy and excellent durability, so that the paint film is resistant to rainwater, sunlight and temperature change, and the adhered substances on the surface are easy to remove; 3. the active component of the sebacate light stabilizer of the nano coating technology is an ultraviolet absorber, which can weaken the damage of ultraviolet irradiation to the stability of a paint film and inhibit the photooxidation of the paint film, thereby improving the damage loss of the hindering gloss to the physical properties of the coating.
In conclusion, the invention has the following beneficial effects:
1. the sebacate light stabilizer of the nano-coating technology meets the strictest requirement on the durability of a paint film, improves the resistance of the coating to gloss loss, chalking, cracking, delamination and color change, contributes to maintaining flexibility, adhesive force, waterproofness and appearance, and obviously improves the durability of the coating.
2. The paint film has bright color, strong tinting strength, strong light and weather resistance, durable color of the coating and long service life.
3. The paint film has extremely low surface energy, can resist rain, sunlight and temperature change, and the adhered matters on the surface are easy to remove.
4. Does not add formaldehyde and any formaldehyde release substances, and is more beneficial to environmental protection.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
In the examples, the raw materials are respectively:
acrylic emulsion: dow Textileshi K-2; dispersing agent: craine Emulsogen SF 8; organic color paste: colayne Blue A2R 100-CN; mildew preventive: toler ACTICIDE OTW; and (3) bactericide: toler ACTICIDE BW 20; wetting agent: BASF-WE 3165; defoaming agent: ST 2410AC by BASF; light stabilizer: basf Tinuvin 123dw (n); rheology modifier: RM-2020 polyurethane.
Example 1 (comparative example)
The preparation steps of the product of the invention (the following are weight percentages):
(1) adding 25% of pure water into a reaction kettle;
(2) adding 55% of acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding 0.6% of dispersing agent, 0.3% of wetting agent and 0.2% of defoaming agent at the rotating speed of 600-800 rpms, and continuing stirring and dispersing for 5 minutes;
(4) stirring and adding 10% of organic color paste at the rotating speed of 600-800 rpms, adjusting the rotating speed to 1000-1200 rpms, and stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, 0.2% of bactericide, 0.15% of mildew preventive and 0.1% of defoaming agent are stirred and added at the rotating speed of 600-800 rpms, and stirring is carried out for 5 minutes;
(6) adjusting the rotating speed to 1000-1200 rpms, adding 0.5% of rheology modifier under stirring, and stirring for 5 minutes;
(7) adding 7.95% pure water, and stirring to obtain the final product.
Example 2
The preparation steps of the product of the invention (the following are weight percentages):
(1) adding 25% of pure water into a reaction kettle;
(2) adding 50% of acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding 0.5% of dispersing agent, 0.25% of wetting agent and 0.2% of defoaming agent at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring at the rotating speed of 600-800 rpms, adding 15% of organic color paste, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and 0.1% of bactericide, 0.15% of mildew preventive and 0.1% of defoamer are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding 0.05% of light stabilizer under stirring, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding 0.4% of rheology modifier under stirring, and stirring for 5 minutes;
(8) adding 8.25% pure water, and stirring to obtain the final product.
Example 3
The preparation steps of the product of the invention (the following are weight percentages):
(1) adding 25% of pure water into a reaction kettle;
(2) adding 55% of acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding 0.4% of dispersing agent, 0.3% of wetting agent and 0.13% of defoaming agent at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring at the rotating speed of 600-800 rpms, adding 18% of organic color paste, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and 0.2% of bactericide, 0.1% of mildew preventive and 0.07% of defoamer are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding 0.1% of light stabilizer under stirring, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding 0.3% of rheology modifier under stirring, and stirring for 5 minutes;
(8) adding 0.4% pure water, and stirring to obtain the final product.
Example 4
The preparation steps of the product of the invention (the following are weight percentages):
(1) adding 20% of pure water into a reaction kettle;
(2) adding 58% of acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding 0.6% of dispersing agent, 0.2% of wetting agent and 0.2% of defoaming agent at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring at the rotating speed of 600-800 rpms, adding 20% of organic color paste, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and 0.1% of bactericide, 0.15% of mildew preventive and 0.1% of defoamer are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding 0.4% of light stabilizer under stirring, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding 0.2% of rheology modifier under stirring, and stirring for 5 minutes;
(8) adding 0.05% pure water, and stirring uniformly to obtain the finished product.
Example 5
The preparation steps of the product of the invention (the following are weight percentages):
(1) adding 17% of pure water into a reaction kettle;
(2) adding 58% of acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding 0.6% of dispersing agent, 0.3% of wetting agent and 0.2% of defoaming agent at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring and adding 22% of organic color paste at the rotating speed of 600-800 rpms, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and 0.2% of bactericide, 0.15% of mildew preventive and 0.1% of defoamer are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding 0.5% of light stabilizer under stirring, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding 0.1% of rheology modifier under stirring, and stirring for 5 minutes;
(8) adding 0.85% pure water, and stirring to obtain the final product.
Example 6
The preparation steps of the product of the invention (the following are weight percentages):
(1) adding 20% of pure water into a reaction kettle;
(2) adding 60% of acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding 0.6% of dispersing agent, 0.3% of wetting agent and 0.2% of defoaming agent at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring at the rotating speed of 600-800 rpms, adding 18% of organic color paste, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and 0.2% of bactericide, 0.15% of mildew preventive and 0.1% of defoamer are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding 0.2% of light stabilizer under stirring, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding 0.2% of rheology modifier under stirring, and stirring for 5 minutes;
(8) adding 0.05% pure water, and stirring uniformly to obtain the finished product.
Example 1 (comparative) and examples 2-6 Performance testing
And (4) testing standard:
1. the 4.3.2 specified lightness value in GB/T15608-plus 2006 China color System is between 6 and 9 (tristimulus value Y is 31.26-79.85).
2. The environment-friendly paint meets the requirements of 'waterborne exterior wall paints-other types' in GB18582-2020 Limit of harmful substances in wall paints for buildings, the detection limit of VOC is less than or equal to 100g/L, and the detection limit of formaldehyde is less than or equal to 50 mg/kg.
3. The stain resistance is tested according to GB/T9780-2013 'test method for stain resistance of coating of architectural coatings'.
4. The aging resistance is tested by an artificial accelerated aging test method according to the regulation of cycle A in GB/T1862009 xenon arc radiation for artificial weathering aging and artificial radiation exposure filtration of colored paint and varnish, and the result is evaluated according to GB/T1766 rating method for aging of colored paint and varnish coatings.
The test results are shown in Table 1.
TABLE 1 test results of examples 2-6 and comparative example (example 1)
As can be seen from the test results of examples 2 to 6 and example 1 (comparative example), in the present invention, example 1 (comparative example) is not added with a light stabilizer, and examples 2 to 6 have a significant improvement in aging resistance, are also more excellent in lightness value and stain resistance, and particularly examples 4 to 6 have significantly excellent aging resistance, powdering resistance and discoloration resistance, of which the test result is the best as in example 6. The ultraviolet stabilizer, the excellent self-crosslinking acrylic emulsion and the organic color paste of the visible nano coating technology are reasonably proportioned, and a stable and excellent-performance final product is obtained. The embodiment of the invention has excellent durability and stain resistance, does not contain other solvents such as formaldehyde and the like, and meets the requirements of GB9755-2014 'synthetic resin emulsion exterior wall coating' on stain resistance excellent products and GB18582-2020 'limit of harmful substances in wall coating for buildings'.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and all such modifications, equivalents and improvements that come within the spirit and scope of the invention are therefore intended to be included therein. It is intended that the invention be limited in any way so that any modification or variation of the invention herein disclosed which comes within the spirit of the invention is encompassed by the invention as hereinafter claimed.
Claims (8)
3. the light-colored, ultra-weatherable exterior wall latex paint of claim 1 which comprises 60% acrylic emulsion; 18 percent of organic color paste; 0.6 percent of dispersant; 0.3% of wetting agent; 0.3 percent of defoaming agent; 0.2% of bactericide; 0.15 percent of mildew preventive; 0.2% of light stabilizer; 0.2% of a rheology modifier; the balance being pure water.
4. The light-colored, ultra-weatherable exterior wall latex paint of claims 1-3 wherein said acrylic emulsion is an aqueous self-crosslinking neat acrylic emulsion.
5. The exterior wall latex paint with bright color and super weatherability as claimed in claim 1-3, characterized in that the organic color paste is prepared by block copolymer wetting dispersant which is high molecular weight block copolymer solution containing pigment affinity group.
6. The light-colored, ultra-weatherable exterior wall latex paint of claims 1-3 wherein said light stabilizer is a sebacate light stabilizer.
7. The exterior wall latex paint with bright color and ultra-weatherability of claim 6, wherein the light stabilizer is sebacate light stabilizer of nano-coating technology.
8. A process for preparing the bright-colored, ultra-weatherable exterior wall latex paint of claims 1-7 comprising the steps of:
(1) adding pure water into a reaction kettle;
(2) adding pure acrylic emulsion into a reaction kettle, and stirring for 3 minutes at the rotating speed of 600-800 rpms;
(3) stirring and adding a dispersing agent, a wetting agent and 2/3 defoaming agent (adding amount) at the rotating speed of 600-800 rpms, and stirring and dispersing for 5 minutes;
(4) stirring at the rotating speed of 600-800 rpms, adding the organic color paste, and continuing stirring for 10 minutes;
(5) the temperature of the reaction kettle is less than or equal to 50 ℃, and the bactericide, the mildew preventive and 1/3 defoamer (addition amount) are added and stirred for 5 minutes at the rotating speed of 600-800 rpms;
(6) adjusting the rotating speed to 1000-1200 rpms, adding a light stabilizer under a stirring state, and stirring for 3 minutes;
(7) adjusting the rotating speed to 600-800 rpms, adding the added rheology modifier under the stirring state, and stirring for 5 minutes;
(8) adding pure water, and stirring to obtain the final product.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114163852A (en) * | 2021-12-06 | 2022-03-11 | 雅士利涂料(苏州)有限公司 | Inorganic coating with bright color and no discoloration and preparation method thereof |
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