CN115109472B - Low-sidelight high-weather-resistance exterior wall coating and preparation method thereof - Google Patents

Low-sidelight high-weather-resistance exterior wall coating and preparation method thereof Download PDF

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CN115109472B
CN115109472B CN202210907857.6A CN202210907857A CN115109472B CN 115109472 B CN115109472 B CN 115109472B CN 202210907857 A CN202210907857 A CN 202210907857A CN 115109472 B CN115109472 B CN 115109472B
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weather
exterior wall
stirring
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CN115109472A (en
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杨佃辉
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Chengdu Dabao Chemical Products Co ltd
Shanghai Taiho Paint Products Co ltd
Dongguan Taiho Chemical Industry Products Co ltd
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Chengdu Dabao Chemical Products Co ltd
Shanghai Taiho Paint Products Co ltd
Dongguan Taiho Chemical Industry Products Co ltd
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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
    • C09D125/00—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 an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • C09D125/14—Copolymers of styrene with unsaturated esters
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular

Abstract

The invention relates to the technical field of paint, in particular to a low-sidelight high-weather-resistance exterior wall paint and a preparation method thereof, wherein the exterior wall paint comprises the following raw materials in percentage by weight: 35-50% of styrene-acrylic emulsion, 0.1-0.5% of polyurethane thickener, 0.5-2% of organosilicon modified wax, 3-6% of mica powder and 45-60% of auxiliary agent. The side gloss of the outer wall coating after being coated is reduced while the weather resistance and the water resistance are ensured, so that the gloss of the side surfaces of the outer wall coating at different angles is close, and the high requirements on a substrate and construction are reduced.

Description

Low-sidelight high-weather-resistance exterior wall coating and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, in particular to a low-sidelight high-weather-resistance exterior wall coating and a preparation method thereof.
Background
In recent years, as the spalling of exterior wall tiles occurs continuously, more and more exterior wall decorations choose exterior wall paint to replace the exterior wall tiles. The conventional exterior wall coating has the characteristic of good weather resistance, but has high side gloss and the following defects: firstly, the construction flatness of the substrate is extremely high, and once the substrate is slightly uneven, the coating can find that the gloss is extremely uneven after being coated and the light-shade gap is obvious when observed from the side; secondly, due to high side glossiness, the joints generated in the coating process of the paint can be obviously seen, the appearance is influenced, the uniformity of the glossiness is influenced, and particularly, the uniformity of the glossiness of the paint containing the pigment is influenced more.
In order to solve the defect caused by high gloss of the side surface of the exterior wall coating, the gloss is reduced by adding the air-silicon matting powder, but the addition of the matting powder can reduce the water resistance of the coating, and the requirement of the exterior wall coating is not met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the low-sidelight high-weather-resistance exterior wall coating and the preparation method thereof, so that the side glossiness of the exterior wall coating after being coated is reduced while the weather resistance and the water resistance are ensured, the glossiness of different angles of the side surface of the exterior wall coating is close, and the high requirements on a substrate and construction are reduced.
Based on the above, the invention provides a low-sidelight high-weather-resistance exterior wall coating, which comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000011
Figure BDA0003773070110000021
preferably, the auxiliary agent comprises one or more of a dispersant, a wetting agent, a defoamer, titanium pigment, barium sulfate, a hiding power polymer, a film forming auxiliary agent, an antifreeze agent, a preservative and a mildew inhibitor.
Preferably, the low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000022
preferably, the styrene-acrylic emulsion is the styrene-acrylic emulsion 8196 of new materials Co., ltd.
Preferably, the polyurethane thickener is polyurethane thickener U-508, commonly known as New Material Co., shanghai).
Preferably, the silicone modified wax is silicone modified wax 4029 of guangzhou Yang Song trade limited.
Preferably, the mica powder is a Guangdong source epitaxy powder Co.Ltd.
The invention also provides a preparation method of the low-sidelight high-weather-resistance exterior wall coating, which comprises the following steps:
s1, uniformly mixing and dispersing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and mixing and dispersing at a high speed to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and anti-freezing agent with the formula amount into the second mixture, and uniformly mixing and dispersing to obtain a third mixture;
and S4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the hiding power polymer into the third mixture according to the formula amount, and stirring and dispersing to obtain the low-side light high-weather-resistance outer wall coating.
Preferably, in the step S1, the stirring is performed at a stirring speed of 300-700 rpm for 3-8 minutes.
Preferably, in the step S2, the stirring is performed at a stirring speed of 1200 to 1800 rpm for 25 to 35 minutes.
Preferably, in the step S3, the stirring speed is 800-1200 rpm for 8-12 minutes.
Preferably, in the step S4, the styrene-acrylic emulsion, the polyurethane thickener, the silicone-modified wax and the hiding power polymer are sequentially added to the third mixture while stirring at a low speed, the stirring speed at a low speed is 300-500 rpm, and the stirring time of each raw material is 10-20 minutes.
The invention has the beneficial effects that:
the exterior wall coating disclosed by the invention takes 35-50% of styrene-acrylic emulsion, 0.1-0.5% of polyurethane thickener, 0.5-2% of organosilicon modified wax and 3-6% of mica powder as main raw materials, and the exterior wall coating has high weather resistance and high water resistance after being coated by the synergistic cooperation of the main raw materials, and the gloss of the side surfaces at different angles is close, so that the high requirements on a substrate and construction are reduced.
Drawings
FIG. 1 is a graph showing the effect of the water resistance test in example 1.
FIG. 2 is a graph showing the effect of the water resistance test of comparative example 1.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the embodiments. It should be understood, however, that the description herein of specific embodiments is for the purpose of illustrating the invention only and is not intended to limit the invention.
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000041
wherein the auxiliary agent comprises one or more of dispersing agent, wetting agent, defoaming agent, titanium pigment, barium sulfate, hiding power polymer, film forming auxiliary agent, antifreeze agent, preservative and mildew inhibitor. The specific choice of the dispersing agent, wetting agent, defoamer, titanium white powder, barium sulfate, hiding power polymer, film-forming auxiliary agent, antifreeze agent, preservative and mildew inhibitor is not particularly required, and the type or model of the dispersant, wetting agent, defoamer, titanium white powder, barium sulfate, hiding power polymer, film-forming auxiliary agent, antifreeze agent, preservative and mildew inhibitor has no influence on the performance of the external wall coating prepared by the invention basically as long as the materials are commonly used in the field and are within the scope of the invention.
Preferably, the styrene-acrylic emulsion is the styrene-acrylic emulsion 8196 of new materials Co., ltd.
Preferably, the polyurethane thickener is polyurethane thickener U-508, commonly known as New Material Co., shanghai).
Preferably, the silicone modified wax is silicone modified wax 4029 of guangzhou Yang Song trade limited.
Preferably, the mica powder is a Guangdong source epitaxy powder Co.Ltd.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 3-8 minutes at a stirring speed of 300-700 rpm to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a high speed of 1200-1800 rpm for 25-35 minutes to ensure that the fineness reaches 45 micrometers to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 800-1200 rpm for 8-12 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 300-500 rpm, and the stirring time of each raw material is 10-20 minutes, so as to obtain the low-side light high-weather-resistant exterior wall coating.
In the preparation process of the exterior wall coating, the mica powder needs to be dispersed at a high speed so that the fineness reaches to be close to the original particle size, and the uniformity and smoothness of the coating of the exterior wall coating are improved. When the pigment and filler is added before the styrene-acrylic emulsion is dispersed, the high stirring speed during pigment and filler dispersion can cause the emulsion to break under the action of shearing force, so that the cohesive force of the styrene-acrylic emulsion is affected, and the raw materials cannot be effectively combined. Because the higher-speed stirring in the first three steps can generate a large amount of heat, and the organosilicon modified wax is denatured when heated, the organosilicon modified wax is added under the condition of low-speed stirring after the styrene-acrylic emulsion is dispersed, and the styrene-acrylic emulsion and the polyurethane thickener continuously emit the heat generated by the high-speed stirring in the first three steps in the process of low-speed stirring, so that the organosilicon modified wax is in a lower-temperature state when being stirred and dispersed.
Example 1
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000051
Figure BDA0003773070110000061
the styrene-acrylic emulsion is a styrene-acrylic emulsion 8196 of general (Shanghai) new material, the polyurethane thickener is a polyurethane thickener U-508 of general (Shanghai) new material, the organosilicon modified wax is an organosilicon modified wax 4029 of Guangzhou municipal Yang Song trade company, and the mica powder is mica powder W-A5 of Guangdong source epitaxial powder company.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 5 minutes at a stirring speed of 500 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1500 revolutions per minute for 30 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 1000 revolutions per minute for 10 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 400 rpm, and the stirring time of each raw material is 15 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Example 2
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000062
Figure BDA0003773070110000071
the styrene-acrylic emulsion is a styrene-acrylic emulsion 8196 of general (Shanghai) new material, the polyurethane thickener is a polyurethane thickener U-508 of general (Shanghai) new material, the organosilicon modified wax is an organosilicon modified wax 4029 of Guangzhou municipal Yang Song trade company, and the mica powder is mica powder W-A5 of Guangdong source epitaxial powder company.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 8 minutes at a stirring speed of 300 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1200 revolutions per minute for 35 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 800 revolutions per minute for 12 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 300 rpm, and the stirring time of each raw material is 20 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Example 3
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000072
Figure BDA0003773070110000081
the styrene-acrylic emulsion is a styrene-acrylic emulsion 8196 of general (Shanghai) new material, the polyurethane thickener is a polyurethane thickener U-508 of general (Shanghai) new material, the organosilicon modified wax is an organosilicon modified wax 4029 of Guangzhou municipal Yang Song trade company, and the mica powder is mica powder W-A5 of Guangdong source epitaxial powder company.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 3 minutes at a stirring speed of 700 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1800 revolutions per minute for 25 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 1200 revolutions per minute for 8 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 500 revolutions per minute, and the stirring time of each raw material is 10 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Comparative example 1
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000091
the styrene-acrylic emulsion is RC-5609 of Guangdong Japanese chemical industry, the polyurethane thickener is U-508 of new material Co., ltd, the organosilicon modified wax is 4029 of Guangdong Yang Song trade Co., ltd, and the mica powder is W-A5 of Guangdong source epitaxy powder Co.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 5 minutes at a stirring speed of 500 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1500 revolutions per minute for 30 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 1000 revolutions per minute for 10 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 400 rpm, and the stirring time of each raw material is 15 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Comparative example 2
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000101
the styrene-acrylic emulsion is RC-5609 of Guangdong Japanese chemical industry, the polyurethane thickener is ceramic RM-8W, the organosilicon modified wax is organosilicon modified wax 4029 of Guangzhou Yang Song trade company, and the mica powder is mica powder W-A5 of Guangdong source epitaxial powder company.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 5 minutes at a stirring speed of 500 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1500 revolutions per minute for 30 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 1000 revolutions per minute for 10 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 400 rpm, and the stirring time of each raw material is 15 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Comparative example 3
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000111
the styrene-acrylic emulsion is RC-5609 of the Guangdong Japanese chemical industry, the polyurethane thickener is ceramic RM-8W, the organosilicon modified wax is OE6307 of the Nanjing Tianshi new material, and the mica powder is mica powder W-A5 of Guangdong source epitaxial powder Co.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 5 minutes at a stirring speed of 500 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1500 revolutions per minute for 30 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 1000 revolutions per minute for 10 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 400 rpm, and the stirring time of each raw material is 15 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Comparative example 4
The low-side light high-weather-resistance exterior wall coating comprises the following raw materials in percentage by weight:
Figure BDA0003773070110000121
the styrene-acrylic emulsion is RC-5609 of Guangdong Japanese chemical industry, the polyurethane thickener is ceramic RM-8W, the organosilicon modified wax is OE6307 of Nanjing Tianshi new material, and the mica powder is CJ-A5 of Chuzhou Wanqiao sericite.
The preparation method of the low-sidelight high-weather-resistance exterior wall coating comprises the following steps:
s1, mixing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount, and stirring for 5 minutes at a stirring speed of 500 revolutions per minute to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and stirring at a stirring speed of 1500 revolutions per minute for 30 minutes at a high speed to enable the fineness to reach 45 microns to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and antifreeze agent with the formula amount into the second mixture, and stirring at a stirring speed of 1000 revolutions per minute for 10 minutes to obtain a third mixture;
s4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer into the third mixture in the formula amount while stirring at a low speed, wherein the stirring speed at the low speed is 400 rpm, and the stirring time of each raw material is 15 minutes, so that the low-side light high-weather-resistant exterior wall coating is obtained.
Performance testing and analysis
(1) Gloss test: gloss results of the exterior wall coatings of examples 1 to 3, comparative examples 1 to 4 coated on the same substrate at 60℃on the side and 85℃on the side were measured using a gloss meter are shown in Table 1.
TABLE 1
Figure BDA0003773070110000131
As can be seen from Table 1, the gloss of the side surface of the outer wall coating prepared by the method is close to that of the side surface of the outer wall coating at 60 degrees and 85 degrees, namely, the gloss of the coating film is uniform when the side surface is observed from different angles, and defects such as uneven substrate or joints in coating construction and coating are not easy to be found, so that the high requirements on the substrate and construction are reduced.
After the coating of the exterior wall coating of comparative example 1, the side face had a gloss of 85 ° of 1.6 times that of 60 ° of the side face, the side face of comparative example 2 had a gloss of 85 ° of 1.9 times that of 60 ° of the side face, the side face of comparative example 3 had a gloss of 85 ° of 2.4 times that of 60 ° of the side face, and the side face of comparative example 4 had a gloss of 85 ° of 2.8 times that of 60 ° of the side face. The modified styrene-acrylic emulsion, polyurethane thickener, organosilicon modified wax and mica powder can affect the uniformity of gloss of the side surface of the external wall coating at different angles, thereby not only affecting the beauty of external wall decoration, but also increasing the high requirements on the substrate and construction.
(2) Weather resistance test: the exterior wall coatings of examples 1-3 and comparative examples 1-4 were each applied to the same substrate, subjected to QUV accelerated aging test for 1000 hours, and the color difference of the coating film was observed, as shown in Table 2.
TABLE 2
Figure BDA0003773070110000141
As can be seen from Table 2, the exterior wall coating prepared by the invention has excellent weather resistance, and once any one of the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the mica powder is changed, the coating weather resistance is greatly reduced.
(3) And (3) water resistance test: the exterior wall coating materials of example 1 and comparative example 1 were coated on the same substrate, placed obliquely, and subjected to a water resistance test at a speed of two drops per three seconds for 10 hours, as shown in fig. 1, the coating film of example 1 had good hydrophobicity, and the water drops were slipped directly from the surface of the coating film, and the water resistance was excellent. As shown in fig. 2, the coating film of comparative example 1 had a significant water mark on the surface, and was poor in water resistance, and the coating film was easily peeled off.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (5)

1. The low-sidelight high-weather-resistance exterior wall coating is characterized by comprising the following raw materials in percentage by weight:
Figure FDA0004134703030000011
the styrene-acrylic emulsion is 8196 which is common (Shanghai) new material limited company;
the polyurethane thickener is polyurethane thickener U-508 which is commonly used as a new material (Shanghai) material;
the organosilicon modified wax is organosilicon modified wax 4029 of Guangzhou Yang Song trade company;
the mica powder is mica powder W-A5 of Guangdong source epitaxy powder limited company;
the auxiliary agents comprise dispersing agents, wetting agents, defoamers, titanium dioxide, barium sulfate, covering power polymers, film forming auxiliary agents, antifreeze agents, preservatives and mildew inhibitors.
2. The low-sidelight high-weather-resistance exterior wall coating of claim 1, which is characterized by comprising the following raw materials in percentage by weight:
Figure FDA0004134703030000012
Figure FDA0004134703030000021
3. the method for preparing the low-side light high-weather-resistance exterior wall coating according to any one of claims 1-2, which is characterized by comprising the following steps:
s1, uniformly mixing and dispersing a dispersing agent, a wetting agent and a defoaming agent according to the formula amount to obtain a first mixture;
s2, adding the formula amount of mica powder, barium sulfate and titanium dioxide into the first mixture, and mixing and dispersing at a high speed to obtain a second mixture;
s3, adding preservative, mildew inhibitor, film forming auxiliary agent and anti-freezing agent with the formula amount into the second mixture, and uniformly mixing and dispersing to obtain a third mixture;
and S4, adding the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the hiding power polymer into the third mixture according to the formula amount, and stirring and dispersing to obtain the low-side light high-weather-resistance outer wall coating.
4. The method for preparing the low-sidelight high-weather-resistance exterior wall coating according to claim 3, which is characterized in that: in the step S2, the mixture is stirred at a high speed of 1200-1800 rpm for 25-35 minutes.
5. The method for preparing the low-sidelight high-weather-resistance exterior wall coating according to claim 3, which is characterized in that: in the step S4, the styrene-acrylic emulsion, the polyurethane thickener, the organosilicon modified wax and the covering power polymer are sequentially added into the third mixture while stirring at a low speed, the stirring speed at the low speed is 300-500 r/min, and the stirring time of each raw material is 10-20 min.
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