A building exterior wall coating

Abstract

The application belongs to the technical field of paint and specifically relates to a building outer wall paint, which comprises the following components: 20-40 parts of acrylic emulsion, 10-20 parts of fluorocarbon emulsion, 10-20 parts of polyurethane resin, 10-20 parts of deionized water, 3-5 parts of film forming agent, 3-5 parts of thickening agent, 20-30 parts of filler and 5-10 parts of pH regulator. The application can solve the problem of high minimum film forming temperature of the paint with acrylic emulsion as the main component and has a good market application prospect.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and specifically relates to an exterior wall coating for buildings. Background Technology

[0002] Paint, traditionally known as varnish in China, is a viscous liquid applied to the surface of an object to be protected or decorated, forming a continuous, firmly adhering film. It is typically made primarily of resin, oil, or emulsion, with or without pigments and fillers, and with appropriate additives, and is prepared using organic solvents or water.

[0003] Exterior wall coatings are used to coat the exterior walls of buildings and possess properties such as UV resistance and water resistance. Patent application number CN201210113756.8 discloses a novel exterior wall coating, comprising, by weight, the following components: 20-30 parts of a mixed emulsion of organosilane and organosiloxane; 20-30 parts of an acrylic emulsion; 20-30 parts of filler; and 10-20 parts of water. Compared with existing exterior wall coatings, this novel exterior wall coating exhibits superior hydrophobicity, breathability, and initial resistance to water discoloration. However, coatings with acrylic emulsion as the main component suffer from drawbacks such as high minimum film-forming temperature and poor film-forming properties and flexibility, affecting practical performance. Therefore, this application provides a building exterior wall coating.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an exterior wall coating that solves the problem of high minimum film-forming temperature in coatings with acrylic emulsion as the main component.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An exterior wall coating for buildings comprises the following components: 20-40 parts acrylic emulsion, 10-20 parts fluorocarbon emulsion, 10-20 parts polyurethane resin, 10-20 parts deionized water, 3-5 parts film-forming agent, 3-5 parts thickener, 20-30 parts filler, and 5-10 parts pH adjuster.

[0008] As a preferred embodiment, the composition includes the following components: 30 parts acrylic emulsion, 15 parts fluorocarbon emulsion, 15 parts polyurethane resin, 3 parts film-forming agent, 7 parts dispersant, 5 parts thickener, 25 parts filler, and 5 parts pH adjuster.

[0009] Preferably, the ratio of acrylic emulsion to fluorocarbon emulsion and polyurethane resin is 2:1:1.

[0010] Preferably, the filler is quartz powder or glass powder.

[0011] Preferably, the film-forming agent is one or more of silicone or modified asphalt.

[0012] Preferably, the thickener is one or more of HPMC, CMC, or HEC.

[0013] Preferably, the preparation method includes the following steps: pouring thickener and dispersant into a mixing tank containing water (first tank) and stirring for 3-5 minutes; then adding filler and continuing to stir for 10-15 minutes; pouring fluorocarbon emulsion and half of the acrylic emulsion into a mixing tank (second tank), stirring for 15-20 minutes and then letting it stand for 5 minutes; simultaneously, pouring polyurethane resin and the other half of the acrylic emulsion into a mixing tank (third tank), stirring for 15-20 minutes and then letting it stand for 5 minutes; pouring the mixed solution from mixing tanks (second and third tanks) into mixing tank (first tank), adding a film-forming agent and continuing to stir for 5-10 minutes; finally adding a pH adjuster, stirring for 5-10 minutes, and measuring the pH to be 7-9, thus obtaining the building exterior wall coating.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The building exterior wall coating of the present invention overcomes the problem of high film-forming temperature by combining acrylic emulsion and polyurethane resin and utilizing the complementary effect of their properties, which is beneficial to improving the overall performance of the coating.

[0016] (2) The building exterior wall coating of the present invention has fluorocarbon emulsion added to the raw materials, which has ultra-long weather resistance and improves the coating film's resistance to alkali, acid rain and salt spray, which is conducive to extending the service life of the exterior wall coating.

[0017] (3) The building exterior wall coating of the present invention is made by mixing acrylic emulsion with fluorocarbon emulsion and polyurethane resin respectively and letting it stand for a period of time. When using it, the whole mixture is stirred. This can avoid the phenomenon of poor adhesion, paint peeling and other problems caused by the reaction of multiple raw materials. Detailed Implementation

[0018] The technical solution of this invention patent will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0019] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The acrylic emulsion used in the following facilities was purchased from Xinlian Chemical's 1025 emulsion, the fluorocarbon emulsion was purchased from 3M Company, model THV340Z, and the polyurethane resin was purchased from Sanheshun brand, model PU0021. Example 1

[0022] An exterior wall coating for buildings comprises the following components: 20 parts acrylic emulsion, 10 parts fluorocarbon emulsion, 10 parts polyurethane resin, 10 parts deionized water, 3 parts silicone, 2 parts HPMC, 1 part CMC, 10 parts quartz powder, 10 parts glass powder, and 5 parts pH adjuster.

[0023] The preparation method of the above-mentioned building exterior wall coating includes the following steps: pouring thickener and dispersant into a mixing tank containing water and stirring for 3 minutes; then adding filler and continuing to stir for 10 minutes; pouring fluorocarbon emulsion and half of the acrylic emulsion into a mixing tank, stirring for 15 minutes and then letting it stand for 5 minutes; at the same time, pouring polyurethane resin and the other half of the acrylic emulsion into a mixing tank, stirring for 15 minutes and then letting it stand for 5 minutes; pouring the mixed solution in mixing tanks two and three into mixing tank one, adding film-forming agent and continuing to stir for 5 minutes; finally adding pH adjuster, stirring for 5 minutes, and measuring the pH to be 7, thus obtaining the building exterior wall coating. Example 2

[0024] An exterior wall coating for buildings comprises the following components: 30 parts acrylic emulsion, 15 parts fluorocarbon emulsion, 15 parts polyurethane resin, 15 parts deionized water, 2 parts silicone, 2 parts modified bitumen, 2 parts HPMC, 2 parts HEC, 25 parts quartz powder, and 8 parts pH adjuster.

[0025] The preparation method of the above-mentioned building exterior wall coating includes the following steps: pouring thickener and dispersant into a mixing tank containing water and stirring for 4 minutes; then adding filler and continuing to stir for 13 minutes; pouring fluorocarbon emulsion and half of the acrylic emulsion into a mixing tank, stirring for 18 minutes and then letting it stand for 5 minutes; at the same time, pouring polyurethane resin and the other half of the acrylic emulsion into a mixing tank, stirring for 18 minutes and then letting it stand for 5 minutes; pouring the mixed solution in mixing tanks two and three into mixing tank one, adding film-forming agent and continuing to stir for 8 minutes; finally adding pH adjuster, stirring for 8 minutes, and measuring the pH to be 8, thus obtaining the building exterior wall coating. Example 3

[0026] An exterior wall coating for buildings comprises the following components: 40 parts acrylic emulsion, 20 parts fluorocarbon emulsion, 20 parts polyurethane resin, 20 parts deionized water, 3 parts silicone, 2 parts modified asphalt, 2 parts CMC, 3 parts HEC, 30 parts glass powder, and 10 parts pH adjuster.

[0027] The preparation method of the above-mentioned building exterior wall coating includes the following steps: pouring thickener and dispersant into a mixing tank containing water and stirring for 5 minutes; then adding filler and continuing to stir for 15 minutes; pouring fluorocarbon emulsion and half of the acrylic emulsion into a mixing tank, stirring for 20 minutes and then letting it stand for 5 minutes; at the same time, pouring polyurethane resin and the other half of the acrylic emulsion into a mixing tank, stirring for 20 minutes and then letting it stand for 5 minutes; pouring the mixed solution in mixing tanks two and three into mixing tank one, adding film-forming agent and continuing to stir for 10 minutes; finally adding pH adjuster, stirring for 10 minutes, and measuring the pH to be 9, thus obtaining the building exterior wall coating.

[0028] Compare with Example 1

[0029] The difference from Example 1 is that no fluorocarbon emulsion was added to the components.

[0030] Compare with Example 2

[0031] The difference from Example 1 is that no polyurethane resin was added to the components.

[0032] Compare with Example 3

[0033] The difference from Example 1 is that no fluorocarbon emulsion and polyurethane resin were added to the components.

[0034] Compare with Example 4

[0035] The difference from Example 1 is that the ratio of acrylic emulsion to fluorocarbon emulsion and polyurethane resin is 1:1:1.

[0036] The preparation method is the same as in Example 1.

[0037] Compare with Example 5

[0038] The difference from Example 1 is that the ratio of acrylic emulsion to fluorocarbon emulsion and polyurethane resin is 2:1:2.

[0039] The preparation method is the same as in Example 1.

[0040] Compare with Example 6

[0041] The difference from Example 1 is that the ratio of acrylic emulsion to fluorocarbon emulsion and polyurethane resin is 2:2:1.

[0042] The preparation method is the same as in Example 1.

[0043] When determining the minimum film-forming temperature, refer to GB / T 9267 and use Shanghai Pushen MFFT minimum film-forming temperature tester (product number PS 2365). Coating samples prepared in the above examples and control examples are coated on the metal gradient plate of the tester to form a continuous and uniform thickness of wet coating film. The sample is dried with a dry air stream, and the sample is simultaneously affected by the temperature on the gradient plate to evaporate moisture and form a film.

[0044] A cooling source and a heating source are respectively set at both ends of the gradient plate. Before testing, the temperatures at both ends of the gradient plate are set, and different temperature gradients are generated on the metal gradient plate through metal heat conduction. Due to the different temperatures on the gradient plate, the film formation location of the sample varies. By finding the boundary point where the film forms and the non-film forms, the corresponding temperature on the gradient plate can be obtained from the screen display, thus yielding the lowest film formation temperature of the sample. The test results of each embodiment and control example are shown in Table 1 below.

[0045] Table 1. Minimum film-forming temperature test of coatings

[0046]

[0047] When the temperatures of the cooling and heating sources located at both ends of the gradient plate change, the measured minimum film-forming temperature of the coating also changes. As can be seen from the data in Table 1, the minimum film-forming temperature measured in Example 1 of the present invention is significantly lower than that in Control Example 3; when the ratio of acrylic emulsion to fluorocarbon emulsion and polyurethane resin is 2:1:1, the measured minimum film-forming temperature of the coating is lower than that used in the other control examples.

[0048] Coatings with different compositions each have their own performance advantages and disadvantages. This application improves the overall performance of the material by mixing acrylic emulsion with fluorocarbon emulsion and polyurethane resin, utilizing the complementary properties of each raw material component. This overcomes the shortcomings of each component and effectively reduces the minimum film-forming temperature of the coating, making it very practical and promising for market application.

[0049] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An architectural exterior coating, characterized in that, The building exterior wall coating comprises the following components: acrylic emulsion 20-40 parts, fluorocarbon emulsion 10-20 parts, polyurethane resin 10-20 parts, deionized water 10-20 parts, film forming agent 3-5 parts, thickening agent 3-5 parts, filler 20-30 parts and pH regulator 5-10 parts; the ratio of the acrylic emulsion, the fluorocarbon emulsion and the polyurethane resin is 2:1:1; the acrylic emulsion is purchased from Xinlian Chemical Industry Co., Ltd. and is 1025 emulsion, the fluorocarbon emulsion is purchased from 3M Company and is THV340Z, and the polyurethane resin is purchased from Sanhe Shun brand and is PU0021.

2. The architectural exterior coating of claim 1, wherein, The filler is quartz powder or glass powder.

3. The architectural exterior coating of claim 1, wherein, The film forming agent is one or more of silicone or modified asphalt.

4. The architectural exterior coating of claim 1, wherein, The thickening agent is one or more of HPMC, CMC or HEC.

5. The architectural exterior coating of claim 1, wherein, The preparation method comprises the following steps: pouring the thickening agent and the dispersant into a stirring barrel one containing deionized water and stirring for 3-5 min; then pouring the filler and continuing to stir for 10-15 min; pouring the fluorocarbon emulsion and half of the acrylic emulsion into a stirring barrel two, stirring for 15-20 min and standing for 5 min, while pouring the polyurethane resin and the other half of the acrylic emulsion into a stirring barrel three, stirring for 15-20 min and standing for 5 min; pouring the mixed solutions in the stirring barrel two and the stirring barrel three into the stirring barrel one, adding the film forming agent and continuing to stir for 5-10 min; finally adding the pH regulator, stirring for 5-10 min, and then measuring the pH value to be 7-9, thereby obtaining the building exterior wall coating. The filler is quartz powder or glass powder. The film forming agent is one or more of silicone or modified asphalt. The thickening agent is one or more of HPMC, CMC or HEC. The preparation method comprises the following steps: pouring the thickening agent and the dispersant into a stirring barrel one containing deionized water and stirring for 3-5 min; then pouring the filler and continuing to stir for 10-15 min; pouring the fluorocarbon emulsion and half of the acrylic emulsion into a stirring barrel two, stirring for 15-20 min and standing for 5 min, while pouring the polyurethane resin and the other half of the acrylic emulsion into a stirring barrel three, stirring for 15-20 min and standing for 5 min; pouring the mixed solutions in the stirring barrel two and the stirring barrel three into the stirring barrel one, adding the film forming agent and continuing to stir for 5-10 min; finally adding the pH regulator, stirring for 5-10 min, and then measuring the pH value to be 7-9, thereby obtaining the building exterior wall coating.

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