High-weather-resistance inorganic waterproof stone-like paint and preparation method thereof

Abstract

The invention discloses a high-weather-resistance inorganic waterproof stone-like paint which comprises a component A and a component B. The mass ratio of the component A to the component B is 1: (1.3-1.7). The component A is prepared from the following components in parts by mass: 600 to 800 parts of polymer acrylic emulsion, 100 to 200 parts of waterborne polyurethane dispersion, 1 to 3 parts of bactericide, 1 to 3 parts of cellulose, 3 to 6 parts of hollow fiber, 3 to 6 parts of polycrystalline mullite fiber, 1 to 3 parts of defoaming agent, 1 to 3 parts of guar gum, 1 to 2 parts of pH regulator and 100 to 200 parts of water; the component B is prepared from the following components in parts by mass: 50 to 150 parts of high-alumina cement, 50 to 100 parts of calcium carbonate, 600 to 800 parts of sintered color sand, 50 to 100 parts of resin sheets and 3 to 10 parts of zinc borate. On the basis, the invention further discloses a preparation method of the high-weather-resistance inorganic waterproof stone-like paint. The high-weather-resistance inorganic waterproof stone-like paint has waterproof performance and stone-like decoration performance, a coating of the high-weather-resistance inorganic waterproof stone-like paint has excellent physical and chemical properties such as aging resistance, flexibility and cohesiveness, is provided with certain breathable channels and has breathability, and the problems that a traditional waterproof coating is not breathable and is prone to bulging and falling off can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of building coatings, and in particular to a highly weather-resistant inorganic waterproof stone-like paint and a preparation method thereof. Background Art

[0002] Imitation stone paint is a kind of building exterior wall decoration paint, which has good weather resistance, water resistance and stain resistance, and can imitate the appearance and texture of marble, granite and other natural stones. It is an environmentally friendly material commonly used in modern building decoration. At present, the mainstream imitation stone paint mainly includes real stone paint and water-in-water paint. Both of these imitation stone paints have decorative and protective functions, but they are lacking in waterproofing.

[0003] With the implementation of GB55030-2022 "General Specification for Waterproofing of Buildings and Municipal Engineering", it is stipulated that the exterior walls of frame filling or masonry structures with a wall waterproofing level of one should be provided with at least two waterproof layers. When two waterproofing measures are adopted, they must include a layer of waterproof mortar and a layer of waterproof coating or other waterproof materials. This requires that when using imitation stone paint to decorate the exterior walls of buildings, it is necessary not only to maintain the decorative effect, but also to have the performance of waterproof coatings.

[0004] In this regard, most of the prior art uses a coating system to balance decorative performance and waterproof performance. As shown in the patent with publication number CN214220354U, it discloses a waterproof real stone paint coating for exterior walls, including an anti-alkali sealing primer, a layer of adhesive is brushed on the anti-alkali sealing primer, a first putty layer is brushed on the adhesive, a layer of anti-cracking mesh cloth is attached to the first putty layer, a second putty layer is brushed on the anti-cracking mesh cloth, a natural real stone paint layer is brushed on the second putty layer, and a latex paint layer is brushed on the natural real stone paint layer.

[0005] Through the anti-alkali sealing primer, it can form super strong adhesion to the concrete, form a good closed area with the concrete, prevent water penetration, play an anti-alkali isolation role, and prevent the seepage of alkali from damaging the coating; by setting the anti-cracking mesh cloth, the first putty layer and the second putty layer form a whole, thereby improving the overall strength of the putty layer; through the natural real stone paint layer, the overall decorative effect is improved; through the latex paint layer, it can quickly form a film, shorten the construction period, and thus save construction costs.

[0006] Obviously, the existing single coating of imitation stone paint is difficult to pass the performance requirements of the current national standards or industry standards for waterproof coatings, and naturally cannot meet the requirements of GB55030-2022 "General Specifications for Waterproofing of Buildings and Municipal Engineering" which requires a layer of waterproof coating. Summary of the invention

[0007] The object of the present invention is to provide a highly weather-resistant inorganic waterproof stone-like paint and a preparation method thereof, so as to achieve a single coating having both a waterproof function and a stone-like decorative effect.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A highly weather-resistant inorganic waterproof stone-like paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:(1.3-1.7); the component A comprises, by mass, 600-800 parts of a polymer acrylic emulsion, 100-200 parts of an aqueous polyurethane dispersion, 1-3 parts of a fungicide, 1-3 parts of cellulose, 3-6 parts of hollow fibers, 3-6 parts of polycrystalline mullite fibers, 1-3 parts of a defoamer, 1-3 parts of guar gum, 1-2 parts of a pH regulator, and 100-200 parts of water; and the component B comprises, by mass, 50-150 parts of high-alumina cement, 50-100 parts of calcium carbonate, 600-800 parts of sintered colored sand, 50-100 parts of a resin flake, and 3-10 parts of zinc borate.

[0010] Furthermore, the fiber length of the hollow fiber is 2-4 mm.

[0011] Furthermore, the polycrystalline mullite fiber has a fiber length of 2-4 mm.

[0012] Furthermore, the particle size of the calcium carbonate is 300-350 meshes.

[0013] Furthermore, the particle size of the sintered colored sand is 80-120 meshes.

[0014] Preferably, the sintered colored sand is porous mullite sintered colored sand.

[0015] Preferably, the mass ratio of the component A to the component B is 1:1.5.

[0016] A method for preparing a highly weather-resistant inorganic waterproof stone-like paint comprises the following steps: preparing component A and component B respectively, and then mixing the prepared component A and component B evenly according to a proportion to obtain the highly weather-resistant inorganic waterproof stone-like paint. Wherein:

[0017] The preparation method of the component A is as follows: S1. adding water, bactericide and defoamer into a disperser, and stirring and dispersing them at a first speed; S2. adding cellulose, guar gum, hollow fiber, polycrystalline mullite fiber and pH adjuster into a disperser, and stirring and dispersing them at a second speed; S3. adding polymer acrylic emulsion and waterborne polyurethane dispersion into a disperser at a third speed, and stirring and dispersing them, to obtain component A.

[0018] The preparation method of the B component is as follows: high alumina cement, calcium carbonate, sintered colored sand, resin flakes and zinc borate are mixed and stirred evenly to obtain the B component.

[0019] Furthermore, the first rotational speed is 400-500 rpm, the second rotational speed is 1200-1800 rpm, and the third rotational speed is 800-1000 rpm.

[0020] The present invention has the following beneficial effects:

[0021] 1. The highly weather-resistant inorganic waterproof imitation stone paint of the present invention meets both the standards for architectural coatings and the standards for coating waterproofing. Its single coating has both waterproof properties and imitation stone decorative properties. It does not need to be matched with other coatings and can also meet the requirements of GB55030-2022 "General Specifications for Waterproofing of Buildings and Municipal Engineering" that a layer of waterproof coating must be set.

[0022] 2. The highly weather-resistant inorganic waterproof imitation stone paint of the present invention utilizes the coordinated effect of three different bonding materials, namely, polymer acrylic emulsion, water-based polyurethane dispersion and high-alumina cement, to provide the coating with excellent physical and chemical properties such as aging resistance, flexibility and adhesion.

[0023] 3. The highly weather-resistant inorganic waterproof stone-like paint of the present invention introduces zinc borate to adjust the hydration rate of high-alumina cement and catalyze the self-crosslinking of polymer acrylic emulsion, which can reduce the adhesion of the coating surface and greatly improve the stain resistance of the coating.

[0024] 4. The highly weather-resistant inorganic waterproof stone-like paint of the present invention contains hollow fibers, polycrystalline mullite fibers and porous mullite sintered colored sand. By utilizing its internal air permeable channels and pores, the coating can have excellent air permeability, solving the problem that traditional waterproof coatings are non-air permeable and easy to bulge and fall off. In addition, the introduction of polycrystalline mullite fibers can also increase the toughness of the coating, and the introduction of porous mullite sintered colored sand can also provide unique color and texture, enhancing the decorative effect. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific implementation methods.

[0026] The invention provides a highly weather-resistant inorganic waterproof stone-like paint, comprising a component A and a component B, wherein the component A is a liquid material, the component B is a powder, the mass ratio of the component A to the component B is 1:(1.3-1.7), and the preferred mass ratio is 1:1.5.

[0027] Component A includes, by mass, 600-800 parts of polymer acrylic emulsion, 100-200 parts of waterborne polyurethane dispersion, 1-3 parts of fungicide, 1-3 parts of cellulose, 3-6 parts of hollow fiber, 3-6 parts of polycrystalline mullite fiber, 1-3 parts of defoamer, 1-3 parts of guar gum, 1-2 parts of pH regulator, and 100-200 parts of water.

[0028] Component B includes, by weight: 50-150 parts of high-alumina cement, 50-100 parts of calcium carbonate, 600-800 parts of sintered colored sand, 50-100 parts of resin flakes, and 3-10 parts of zinc borate.

[0029] Among them, the use of polymer acrylic emulsion as the base material can provide basic physical and mechanical properties such as coating adhesion, water resistance, and weather resistance. The use of waterborne polyurethane dispersion can provide excellent tensile strength and elongation at break. The use of high-aluminum cement can provide hardness and wear resistance, and enhance the durability of the coating. Under the coordinated action of the three different bonding materials of polymer acrylic emulsion, waterborne polyurethane dispersion and high-aluminum cement, the coating provides excellent physical and chemical properties such as aging resistance, flexibility, and adhesion.

[0030] On this basis, the highly weather-resistant inorganic waterproof stone-like paint also introduces zinc borate, which undergoes hydrolysis in water to generate boric acid and zinc ions. Boric acid can inhibit the hydration of high-alumina cement on the one hand, preventing the high-alumina cement from coagulating too quickly and affecting the use time of the paint. On the other hand, it can react with guar gum to form a composite system containing dynamic borate bonds, so that the paint forms a hydrogel and inhibits the precipitation of sintered colored sand. Zinc ions can promote the self-crosslinking reaction of polymer acrylic emulsion to generate an ion crosslinking network, thereby improving the performance of the coating, increasing the drying speed, coating hardness and stain resistance.

[0031] While meeting the requirements of air permeability, the hollow fibers contained in the highly weather-resistant inorganic waterproof stone-like paint have a tubular cavity structure in the axial direction, forming an air-permeable channel through which water vapor molecules can pass freely. This gives the coating excellent air permeability and avoids the problem of traditional waterproof coatings being non-air permeable and easy to bulge and fall off.

[0032] Similarly, polycrystalline mullite fibers also have certain air permeable channels, which can provide a basis for improving the air permeability of the coating. In addition, the introduction of polycrystalline mullite fibers can also increase the toughness of the coating, so that the coating has excellent air permeability and strong tensile strength.

[0033] Similarly, the sintered colored sand is preferably porous mullite sintered colored sand, which has a large number of holes and voids and a void ratio of more than 35%. While providing unique color and texture and enhancing the decorative effect, it also has a certain effect on improving the air permeability of the coating. In terms of decorativeness, sintered colored sand can be combined with resin flakes of different colors and sizes to achieve different imitation stone effects.

[0034] In this embodiment, component A is specifically selected as follows: the polymer acrylic emulsion is BASF 3587 pure acrylic emulsion; the aqueous polyurethane dispersion is preferably an anionic aliphatic polyurethane dispersion, UH2895 from Covestro; the fungicide is EG-CLF from Thor; the cellulose is PMC40US from Lotte; the hollow fiber is the three-dimensional hollow fiber from Nantong Hongxin Fiber Co., Ltd., and the fiber length is 2-4 mm; the polycrystalline mullite fiber is selected from Zhejiang Hongda Crystal Fiber Co., Ltd., and the fiber length is 2-4 mm; the defoamer is NXZ from Nopco; and the guar gum is the building material guar gum from Guangrao Liuhe Chemical.

[0035] In this embodiment, component B is specifically selected as follows: high alumina cement is selected from LAFARGE's Sscar71 white cement; the calcium carbonate particle size is 300-350 mesh, preferably 325 mesh calcium carbonate; the sintered colored sand is selected from the porous mullite sintered colored sand produced by Guangzhou Outude Building Materials Co., Ltd., and its particle size is 80-120 mesh; the resin sheet is selected from the composite sheet produced by Jiangxi Tiansheng New Materials Co., Ltd.; the zinc borate is selected from Zhejiang Xusen Flame Retardant Co., Ltd. 3.5 water zinc borate.

[0036] The method for preparing highly weather-resistant inorganic waterproof stone-like paint comprises the following steps: preparing component A and component B respectively, and then uniformly mixing the prepared component A and component B according to a proportion to obtain the highly weather-resistant inorganic waterproof stone-like paint.

[0037] Wherein, the preparation method of component A is as follows:

[0038] S1. Add water, fungicide and defoamer to the disperser according to the ratio and stir and disperse at a first speed;

[0039] S2. Maintaining the first speed, the cellulose, guar gum, hollow fiber, polycrystalline mullite fiber, pH adjuster are added to the disperser in order according to the ratio, and then the speed is increased to stir and disperse at a second speed;

[0040] S3. Set the third speed, and at the third speed, add the polymer acrylic emulsion and the aqueous polyurethane dispersion into the disperser for stirring and dispersion to obtain component A.

[0041] In steps S1-S3, the first speed is set to 400-500 rpm, the second speed is set to 1200-1800 rpm, and the third speed is set to 800-1000 rpm.

[0042] The preparation method of component B is as follows: high alumina cement, calcium carbonate, sintered colored sand, resin flakes and zinc borate are put into a dry powder mixing tank according to a proportion, mixed, and stirred evenly to obtain component B.

[0043] The high weather-resistant inorganic waterproof imitation stone paint was tested according to JG / T24-2018 "Synthetic resin emulsion sand-like architectural coating" and GB / T23445-2009 "Polymer cement waterproof coating", and its air permeability was tested according to JG / T309-2011 "Determination and classification of water vapor transmission rate of exterior wall coatings". The test results are shown in the following table:

[0044]

[0045]

[0046] It can be seen from the table that the test results of the highly weather-resistant inorganic waterproof imitation stone paint have met the standard requirements, the air permeability has also reached level 1, and there is no risk of bulging in the coating.

[0047] In summary, this highly weather-resistant inorganic waterproof imitation stone paint has decorative, waterproof and water vapor permeability, is highly practical, and has many excellent physical and chemical properties such as aging resistance, stain resistance, flexibility, and adhesion.

[0048] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A highly weather-resistant inorganic waterproof stone-like paint, characterized in that: It comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:(1.3-1.7); The component A comprises, by weight: 600-800 parts of polymer acrylic emulsion, 100-200 parts of waterborne polyurethane dispersion, 1-3 parts of fungicide, 1-3 parts of cellulose, 3-6 parts of hollow fiber, 3-6 parts of polycrystalline mullite fiber, 1-3 parts of defoamer, 1-3 parts of guar gum, 1-2 parts of pH regulator, and 100-200 parts of water; The B component comprises, by weight: 50-150 parts of high alumina cement, 50-100 parts of calcium carbonate, 600-800 parts of sintered colored sand, 50-100 parts of resin flakes, and 3-10 parts of zinc borate.

2. The highly weather-resistant inorganic waterproof stone-like paint according to claim 1, characterized in that: The fiber length of the hollow fiber is 2-4 mm.

3. The highly weather-resistant inorganic waterproof stone-like paint according to claim 1, characterized in that: The fiber length of the polycrystalline mullite fiber is 2-4 mm.

4. The highly weather-resistant inorganic waterproof stone-like paint according to claim 1, characterized in that: The particle size of the calcium carbonate is 300-350 meshes.

5. The highly weather-resistant inorganic waterproof stone-like paint according to claim 1, characterized in that: The particle size of the sintered colored sand is 80-120 meshes.

6. The highly weather-resistant inorganic waterproof stone-like paint according to claim 1, characterized in that: The sintered colored sand is porous mullite sintered colored sand.

7. The highly weather-resistant inorganic waterproof stone-like paint according to claim 1, characterized in that: The mass ratio of the component A to the component B is 1:1.

5.

8. A method for preparing the highly weather-resistant inorganic waterproof stone-like paint according to any one of claims 1 to 7, characterized in that: The following steps are involved: Prepare component A and component B respectively, and then mix the prepared component A and component B evenly according to a ratio to obtain the highly weather-resistant inorganic waterproof stone-like paint, wherein: The preparation method of the A component is as follows: S1. Add water, fungicide and defoamer to the disperser and stir and disperse at a first speed; S2. The cellulose, guar gum, hollow fibers, polycrystalline mullite fibers, and pH regulator are added to a disperser and stirred and dispersed at a second speed; S3. At a third speed, the polymer acrylic emulsion and aqueous polyurethane dispersion were added to a disperser and stirred and dispersed to obtain component A; The preparation method of the B component is as follows: The high-alumina cement, calcium carbonate, sintered colored sand, resin flakes and zinc borate are mixed and stirred evenly to obtain component B.

9. The method for preparing the highly weather-resistant inorganic waterproof stone-like paint according to claim 8, characterized in that: The first rotation speed is 400-500 rpm, the second rotation speed is 1200-1800 rpm, and the third rotation speed is 800-1000 rpm.

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