High-flexibility colorful environment-friendly exposed waterproof coating and preparation method thereof

Abstract

The invention belongs to the field of waterproof coatings, and discloses a high-flexibility colorful environment-friendly exposed waterproof coating and a preparation method thereof. The waterproof coating comprises the following components: water, a white pigment filler, a filler, a silicon-containing acrylic acid super weather-resistant emulsion and an auxiliary agent, and optionally further comprises a nano-scale color pigment, the white pigment filler comprises rutile type titanium dioxide, and optionally further comprises hydrophobic fumed silica and / or aluminum oxide; the silicon-containing acrylic acid super-weather-resistant emulsion comprises the following components: water, a silicon-containing monomer, methyl methacrylate, butyl acrylate, acrylic acid, an emulsifier, an initiator and a buffer agent. The auxiliary agent comprises a silane coupling agent. The waterproof coating provided by the invention has the characteristics of being more environment-friendly, good in weather resistance, high in flexibility, customizable in color and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of waterproof coatings, more specifically, relates to a high-soft color-changing environmentally friendly type of exposed waterproof coating and a preparation method. BACKGROUND

[0002] Traditional waterproof coatings have certain limitations in terms of flexibility, weather resistance, environmental protection, etc. For some waterproof projects that need to be used for a long time, such as metal roofs, exterior walls, etc., the existing waterproof coatings are difficult to meet the comprehensive needs of high flexibility, weather resistance, color beauty and environmental protection and safety. Specifically:

[0003] Metal roofs, cement substrates, concrete substrates, etc. are widely used in buildings and industrial facilities. Metal materials, cement substrates and concrete substrates are easily affected by environmental factors such as moisture, oxygen, salt mist and ultraviolet light when exposed to outdoor environments for a long time, resulting in corrosion and aging. Therefore, it is an urgent need to provide effective coating protection for metal roofs, cement substrates, concrete substrates, etc. to prolong their service life and reduce maintenance costs.

[0004] Different customers have different construction and sensory perceptions of different substrates, and have diverse color needs for products. However, many coatings have single colors and cannot meet the design requirements of building appearance diversification, and there are few color-adjustable waterproof coatings on the market.

[0005] Some products on the market lack flexibility and are prone to cracking when the substrate deforms, resulting in waterproof failure.

[0006] In addition, some coatings contain a large amount of organic solvents, which will release harmful gases during construction and use, causing harm to the environment and human health.

[0007] Therefore, in view of the above situation, it is urgent to propose a high-soft color-changing environmentally friendly type of exposed waterproof coating, which has important practical significance. SUMMARY

[0008] The purpose of the present application is to overcome the shortcomings of the prior art and provide a high-soft color-changing environmentally friendly type of exposed waterproof coating and a preparation method. The present application provides a waterproof coating that is more environmentally friendly, has good weather resistance, high flexibility and customizable color.

[0009] To achieve the above purpose, the present application provides a high-soft color-changing environmentally friendly type of exposed waterproof coating, which comprises the following components: water, white pigment filler, filler, silicon-containing acrylic acid super-weather-resistant emulsion and auxiliary agent, and optionally further comprises nano-sized color pigment.

[0010] The white pigment filler comprises rutile titanium dioxide, and optionally further comprises hydrophobic fumed silica and / or aluminum oxide;

[0011] The silicon-containing acrylic super-durable emulsion comprises the following components: water, silicon-containing monomer, methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), emulsifier, initiator and buffer;

[0012] The auxiliary agent comprises a silane coupling agent.

[0013] According to the present application, preferably, the waterproof coating comprises the following components in parts by weight: water 10-25 parts, white pigment filler 1-15 parts, filler 15-30 parts, silicon-containing acrylic super-durable emulsion 25-45 parts, auxiliary agent 5-15 parts and nanoscale color pigment 0-10 parts.

[0014] In the present application, the present application can customize the color of the coating according to customer needs. First, the present application obtains adjustable light color system, adjustable medium color system and adjustable dark color system by different proportions of white pigment filler. Then, the present application adds nanoscale color pigment to the coating, the nanoscale color pigment is a pigment with high dispersibility and bright color, which can give the coating a magic color effect, as a preferred solution, the nanoscale color pigment is iron oxide red, iron oxide yellow, phthalocyanine blue, nano carbon black and the like, and further different colors such as dark gray, medium gray and light gray are mixed according to needs.

[0015] According to the present application, preferably, in the white pigment filler: the weight ratio of the rutile titanium dioxide and the hydrophobic fumed silica is (0.5-15):(0-10).

[0016] According to the present application, preferably, the filler is at least one of heavy calcium carbonate, barium sulfate, kaolin and quartz powder; preferably, the filler is a mixture of heavy calcium carbonate, barium sulfate and kaolin, and the weight ratio of the heavy calcium carbonate, barium sulfate and kaolin is (10-15):(3-10):(3-5).

[0017] According to the present application, preferably, the auxiliary agent comprises the following components in parts by weight: silane coupling agent 1-5 parts, defoaming agent 0.1-1.5 parts, dispersant 3-4 parts, wetting agent 0.1-1 part, thickening agent 1-5 parts, preservative 0-1 part.

[0018] According to the present application, preferably, the silicon-containing acrylic super-durable emulsion comprises the following components by weight: water 20-60 parts, silicon-containing monomer 1-15 parts, methyl methacrylate 15-40 parts, butyl acrylate 25-50 parts, acrylic acid 1-10 parts, emulsifier 1-10 parts, initiator 0.3-1 part and buffer 0.1-1 part. Further preferably, the silicon-containing acrylic super-durable emulsion comprises the following components by weight: water 29 parts, silicon-containing monomer 10 parts, methyl methacrylate 20 parts, butyl acrylate 30 parts, acrylic acid 5 parts, emulsifier 5 parts, initiator 0.5 part and buffer 0.5 part.

[0019] According to the present application, preferably, the silicon-containing monomer is vinyl triethoxysilane (VTES) and / or γ-methacryloxypropyl trimethoxysilane (KH-570).

[0020] According to the present application, preferably, the initiator is at least one of potassium persulfate (KPS) aqueous solution, ammonium persulfate (APS) aqueous solution, azobisisobutyronitrile (AIBN), mixture of hydrogen peroxide and ascorbic acid, 2-hydroxy-2-methyl-1-phenylpropanone (Darocur 1173) and sodium bisulfite (NaHSO3) aqueous solution. Preferably, the initiator is ammonium persulfate (APS) aqueous solution.

[0021] According to the present application, preferably, the buffer is at least one of sodium bicarbonate buffered aqueous solution, sodium carbonate buffered aqueous solution, sodium dihydrogen phosphate buffered aqueous solution, disodium hydrogen phosphate buffered aqueous solution, dipotassium hydrogen phosphate buffered aqueous solution, sodium pyrophosphate buffered aqueous solution and triethanolamine (TEA) buffered aqueous solution.

[0022] According to the present application, preferably, the emulsifier is an ionic emulsifier or a non-ionic emulsifier; preferably, the ionic emulsifier is at least one of sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), dioctyl sulfosuccinate sodium (AOT) and cetyltrimethylammonium bromide (CTAB); preferably, the non-ionic emulsifier is nonylphenol polyoxyethylene ether (NP-10) and / or octylphenol polyoxyethylene ether (OP-10).

[0023] According to the present application, preferably, the silicon-containing acrylic super-durable emulsion further comprises a stabilizer, which is at least one of sodium bicarbonate aqueous solution, sodium hydroxide aqueous solution and potassium hydroxide aqueous solution, and the amount of the stabilizer is to ensure that the pH of the silicon-containing acrylic super-durable emulsion is 7-8.

[0024] According to the present application, preferably, the method for preparing the silicon-containing acrylic super-durable emulsion comprises the following steps:

[0025] S1: mix water, emulsifier and buffer and stir until uniform (to fully dissolve the emulsifier), to obtain an emulsifier solution; mix the emulsifier solution with methyl methacrylate, butyl acrylate, acrylic acid and silicon-containing monomer and stir (30-60 min) until uniform, to obtain a uniform and stable pre-emulsion (the process of preparing the pre-emulsion can disperse methyl methacrylate, butyl acrylate, acrylic acid and silicon-containing monomer into fine droplets under the action of the emulsifier, which is conducive to uniform subsequent polymerization);

[0026] S2: mix part of the pre-emulsion with part of the initiator and stir to perform seed polymerization (the initial polymer particles formed by seed polymerization serve as the core of the subsequent polymerization), and after the seed polymerization system appears blue fluorescence (indicating that the seed polymerization reaction has started), add the remaining part of the pre-emulsion and the remaining part of the initiator into the seed polymerization system at a constant speed (the device is preferably a constant-pressure dropping funnel) (the addition time is 2-3 hours, and the reaction temperature is kept stable at 75-85℃ during the addition process, so that methyl methacrylate, butyl acrylate, acrylic acid and silicon-containing monomer continuously polymerize and grow on the surface of the initial polymer particles), and after the addition is completed, perform a heat preservation treatment (to ensure that methyl methacrylate, butyl acrylate, acrylic acid and silicon-containing monomer are fully polymerized, and to improve the conversion rate of the emulsion), cool (to room temperature 25℃) and filter (to remove possible gel impurities in the emulsion), to obtain a silicon-containing acrylic acid super-durable emulsion.

[0027] According to the present application, preferably, the weight of the part of the pre-emulsion accounts for 10%-20% of the total weight of the pre-emulsion.

[0028] According to the present application, preferably, the weight of the part of the initiator accounts for 1 / 6-1 / 2 of the total weight of the initiator.

[0029] According to the present application, preferably, the temperature of the seed polymerization reaction is 75-85℃.

[0030] According to the present application, preferably, the temperature of the heat preservation treatment is 75-85℃, and the time is 1-2h.

[0031] According to the present application, preferably, the preparation method of the silicon-containing acrylic acid super-durable emulsion further comprises: mixing the emulsion system after cooling in step S2 with the stabilizer and reacting (to neutralize the carboxyl groups in acrylic acid (AA) and improve the stability of the emulsion), and filtering (to remove possible gel impurities in the emulsion), to obtain a silicon-containing acrylic acid super-durable emulsion.

[0032] Another aspect of the present invention provides a method for preparing the aforementioned highly flexible, iridescent, environmentally friendly, and exposing waterproof coating. The preparation method involves mixing and stirring water, white pigments and fillers, fillers, a silicone-containing acrylic ultra-weather-resistant emulsion, additives, and optional nano-sized colored pigments until homogeneous, thereby obtaining the aforementioned highly flexible, iridescent, environmentally friendly, and exposing waterproof coating.

[0033] The beneficial effects of the technical solution of this invention are as follows: The waterproof coating of this invention overcomes the shortcomings of traditional waterproof coatings, such as poor weather resistance, poor flexibility, poor environmental friendliness, and monotonous and unidentifiable colors. It provides a more environmentally friendly waterproof coating with good weather resistance, high flexibility, and customizable colors. The coating color can be customized according to customer requirements, complementing the color of the building. The waterproof coating of this invention can be used for waterproofing projects on directly exposed metal roofs such as color steel roofs, and can also be used on other roofing systems such as cement-based, concrete roofs, and aged asphalt roofs. Specifically:

[0034] The waterproof coating product of this invention has high flexibility. The silicone-containing acrylic ultra-weather-resistant emulsion of this invention is a high-elasticity, high-strength emulsion with a three-dimensional network structure. Specifically, it involves introducing siloxane active groups into flexible acrylate molecular chains through a copolymerization reaction, followed by hydrolysis to generate silanol groups, and then forming Si-O-Si covalently bridged molecular chains through a condensation reaction. Finally, during film formation, it is perfected into a three-dimensional structure of interpenetrating "rigid siloxane network - flexible acrylate segments." The flexible acrylate segments impart toughness and adhesion to the film layer. The rigid Si-O-Si network is resistant to high temperatures (withstanding temperatures above 150°C), while the flexible acrylate segments are resistant to low temperatures (not becoming brittle below -30°C). The three-dimensional network structure can buffer the thermal expansion and contraction stress caused by temperature changes. The silicone-containing acrylic ultra-weather-resistant emulsion of this invention, combined with white pigments, fillers, and additives, forms a waterproof coating with waterproof function and high flexibility through physical mixing.

[0035] This invention optimizes the addition of white pigments and fillers and silicone-containing acrylic ultra-weather-resistant emulsion in the waterproof coating formulation, so that the solid content of the waterproof coating product of this invention is ≥65%. Furthermore, since the silicone-containing acrylic ultra-weather-resistant emulsion of this invention is a high-elasticity and high-strength emulsion, the coating formed by the waterproof coating of this invention has high elasticity and high strength.

[0036] The waterproof coating of the present invention also has a superhydrophobic dual self-cleaning function. The principle is that the hydrophobic fumed silica forms a superhydrophobic surface similar to the "lotus leaf effect" through its micron-nano dual structure, which allows water droplets to roll on the coating surface and carry away dirt. This enables the waterproof coating of the present invention to achieve a stable and long-lasting self-cleaning function that is difficult to achieve with traditional waterproof coatings. The coating formed by the waterproof coating of the present invention can keep the surface clean even in rainy and polluted environments, greatly reducing maintenance requirements.

[0037] This invention improves the adhesion of its waterproof coating by adding a silane coupling agent. The silane coupling agent forms a chemical bond with the metal surface, ensuring that the coating adheres firmly to the metal substrate, improving the coating's impact resistance, and enabling the coating to adapt to the thermal expansion and contraction of the metal substrate under alternating hot and cold conditions, thus preventing the coating from cracking. Compared with traditional coatings, the waterproof coating of this invention performs better under extreme climate and impact conditions, providing long-lasting adhesion and durability.

[0038] The waterproof coating product of this invention has good color variability. By adjusting the proportion of white pigments and fillers (adjustable to light, medium, and dark colors), this invention achieves the goal of adjusting to thousands of colors without affecting the performance of the waterproof coating product, and can be customized according to customer needs.

[0039] The waterproof coating product of this invention has good weather resistance. This invention introduces silicon-containing monomers into the acrylic molecular chain. The silicon atoms in the waterproof coating have high electronegativity, small radius, and high C-SI bond energy, thus reducing the photo-oxidation reaction rate of the coating and significantly improving the weather resistance of the coating in outdoor environments. Even when exposed to sunlight for a long time, it is not easy to cause chalking, fading, or cracking.

[0040] The waterproof coating product of the present invention has good workability. The solid content of the waterproof coating product of the present invention is ≥65%. After opening the can, the waterproof coating product of the present invention can be mixed with water of different amounts, and thus applied to the substrate with different moisture contents. The waterproof coating product of the present invention can be used after stirring evenly after opening the can. The waterproof coating product of the present invention can be applied by roller coating and spraying. The application is smooth, simple, easy to operate and apply, and the product does not crack or drip.

[0041] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0042] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings.

[0043] Figure 1 The images show actual photos of the highly flexible, iridescent, environmentally friendly, and exposing waterproof coatings provided in Examples 1-3 of the present invention (Example 3: dark gray coating; Example 2: medium gray coating (the bottom is not coated with the medium gray coating of Example 2, so it is shown as a white waterproof coating base, in the middle; Example 1: light gray coating) Detailed Implementation

[0044] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0045] In the following embodiments:

[0046] γ-Methacryloxypropyltrimethoxysilane (KH-570) was purchased from Wacker Chemie AG, Germany, and its model number is [model number missing]. GF 31;

[0047] The defoamers are Dow Chemical's DOW-2-1184 silicone defoamer and Wacker Chemicals' SE-47 defoamer;

[0048] The dispersants used were Dispex AA4040 dispersant from Synthomer (UK) and Z-6040 dispersant from Dow Corning (USA).

[0049] The wetting agent is Clariant EMULSOGEN LCN 407 wetting agent;

[0050] The thickeners are BASF Rheovis PU 1190 thickener and Dow Chemical DR-50 thickener;

[0051] The silane coupling agent is Evonik KH-792 silane coupling agent from Germany;

[0052] The heavy calcium carbonate is 800 mesh heavy calcium carbonate;

[0053] The barium sulfate is 1600 mesh barium sulfate;

[0054] The kaolin is 2000 mesh kaolin;

[0055] Other components can be commercially available.

[0056] Example 1

[0057] This embodiment provides a highly flexible, iridescent, environmentally friendly, and exposing waterproof coating. The waterproof coating comprises the following components by weight: 20 parts deionized water, 10 parts white pigment and filler, 20 parts filler, 40 parts silicone-containing acrylic ultra-weather-resistant emulsion, 10 parts additives, and 2 parts nano carbon black (Suzhou Shiming SM6800 carbon black).

[0058] The white pigment and filler comprises the following components by weight: 10 parts rutile titanium dioxide and 0 parts hydrophobic fumed silica.

[0059] The filler comprises the following components by weight: 12 parts of 800-mesh heavy calcium carbonate, 4 parts of 1600-mesh barium sulfate, and 4 parts of 2000-mesh kaolin.

[0060] The additives comprise the following components in parts by weight: 0.4 parts DOW-2-1184 silicone defoamer, 0.6 parts Wacker Chemie SE-47 defoamer, 3.5 parts Dispex AA4040 dispersant, 0.5 parts EMULSOGEN LCN 407 wetting agent, 3 parts Dow Chemical DR-50 thickener, and 2 parts Evonik KH-792 silane coupling agent.

[0061] The silicone-containing acrylic ultra-weather-resistant emulsion comprises the following components in parts by weight:

[0062] 20 parts methyl methacrylate (MMA), 30 parts butyl acrylate (BA), 5 parts acrylic acid (AA), 10 parts silicon-containing monomer γ-methacryloyloxypropyltrimethoxysilane (KH-570), 5 parts emulsifier sodium dodecyl sulfate (SDS), 0.5 parts initiator (10% by mass) potassium persulfate (KPS) aqueous solution, 0.5 parts buffer (1.5% by mass) dipotassium hydrogen phosphate buffer aqueous solution, 29 parts deionized water (as reaction medium), sodium bicarbonate aqueous solution (the amount used is to ensure that the pH of the silicon-containing acrylic ultra-weather-resistant emulsion is 8).

[0063] The preparation method of the above-mentioned highly flexible, iridescent, environmentally friendly, and exposed waterproof coating includes the following steps:

[0064] S1: Pre-emulsification

[0065] In a clean beaker, add deionized water, emulsifier, and buffer, and stir until the emulsifier is fully dissolved, forming an emulsifier solution. Add MMA, BA, AA, and the silicon-containing monomer sequentially to the emulsifier solution, and continue stirring for 50 minutes to form a homogeneous and stable pre-emulsion. This pre-emulsification process allows MMA, BA, AA, and the silicon-containing monomer to disperse into fine droplets under the action of the emulsifier, which is beneficial for the uniformity of subsequent polymerization reactions.

[0066] S2: Polymerization reaction

[0067] Add a portion of the preemulsion (20% of the total weight of the preemulsion) and a portion of the initiator (1 / 3 of the total weight of the initiator) to a four-necked flask, start stirring, and heat to 80°C to carry out seed polymerization. The initial polymer particles formed by seed polymerization serve as the core for subsequent polymerization reactions.

[0068] After the seed polymerization reaction system shows blue fluorescence (indicating the start of the seed polymerization reaction), the remaining pre-emulsion and the remaining initiator are added dropwise to the four-necked flask at a uniform rate over 3 hours through a constant pressure dropping funnel. During the dropping process, the reaction temperature is kept stable at 80°C, so that MMA, BA, AA and silicon-containing monomers continuously polymerize and grow on the surface of the initial polymer particles.

[0069] After the addition is complete, continue to keep warm for 1.5 hours to ensure that MMA, BA, AA and silicon-containing monomers are fully polymerized and improve the emulsion conversion rate;

[0070] After the heat preservation is completed, cool the emulsion system to room temperature;

[0071] The pH of the cooled emulsion system was adjusted to 8 using an aqueous sodium bicarbonate solution to neutralize the carboxyl groups in acrylic acid (AA) and improve the stability of the emulsion.

[0072] Finally, by filtering out impurities such as gel that may exist in the emulsion system, a stable silicone-containing acrylic ultra-weather-resistant emulsion is obtained.

[0073] S3: Mix deionized water, white pigments and fillers, fillers, silicone-containing acrylic ultra-weather-resistant emulsion, and additives evenly to obtain a white coating (adjustable to a lighter shade); mix the white coating (adjustable to a lighter shade) with nano-carbon black evenly to obtain a light gray coating, such as... Figure 1 .

[0074] Example 2

[0075] The only difference between this embodiment and Embodiment 1 is that:

[0076] The white pigment and filler comprises the following components by weight: 5 parts rutile titanium dioxide and 5 parts hydrophobic fumed silica.

[0077] The paint is white and is a tunable medium shade. Mixing the white, tunable medium shade paint with two parts of nano-carbon black yields a medium gray paint. Figure 1 .

[0078] Example 3

[0079] The only difference between this embodiment and Embodiment 1 is that:

[0080] The waterproof coating comprises the following components by weight: 20 parts deionized water, 6 parts white pigments and fillers, 24 parts fillers, 40 parts silicone-containing acrylic ultra-weather-resistant emulsion, 10 parts additives, and 2 parts nano carbon black (Suzhou Shiming SM6800 carbon black).

[0081] The white pigment and filler comprises the following components by weight: 1 part rutile titanium dioxide and 5 parts hydrophobic fumed silica;

[0082] The filler comprises the following components by weight: 14 parts of 800-mesh heavy calcium carbonate, 6 parts of 1600-mesh barium sulfate, and 4 parts of 2000-mesh kaolin.

[0083] The paint is white, but can be adjusted to darker shades; by mixing the white paint (with adjustable darker shades) with nano-carbon black and stirring thoroughly, a dark gray paint is obtained, such as... Figure 1 .

[0084] Example 4

[0085] The only difference between this embodiment and Embodiment 1 is that the silicone-containing acrylic ultra-weather-resistant emulsion includes the following components by weight:

[0086] 20 parts methyl methacrylate (MMA), 30 parts butyl acrylate (BA), 5 parts acrylic acid (AA), 5 parts silicon-containing monomer γ-methacryloyloxypropyltrimethoxysilane (KH-570), 5 parts emulsifier sodium dodecyl sulfate (SDS), 0.5 parts initiator (10% by mass) potassium persulfate (KPS) aqueous solution, 0.5 parts buffer (1.5% by mass) dipotassium hydrogen phosphate buffer aqueous solution, 34 parts deionized water (as reaction medium), sodium bicarbonate aqueous solution (the amount used is to ensure that the pH of the silicon-containing acrylic ultra-weather-resistant emulsion is 8).

[0087] Comparative Example 1

[0088] The only difference between this comparative example and Example 1 is that the silicone-containing acrylic ultra-weather-resistant emulsion in this comparative example is replaced with a regular acrylic emulsion, namely the Badifu FS-7320D model emulsion.

[0089] Test case

[0090] This test case tested the coatings of the above embodiments and comparative examples, and the results are shown in Table 1.

[0091] Table 1

[0092]

[0093]

[0094] The test data above show that the waterproof coating prepared by this invention has excellent flexibility, tensile strength, elongation at break, good water resistance and weather resistance. The three embodiments yielded three different colored waterproof coatings (light, medium and dark colors), which can be tinted according to different needs. After tinting, the colors are highly vibrant, meeting the dual requirements of waterproofing and aesthetics in buildings.

[0095] This invention achieves excellent color effects in the cured waterproof coating by using different proportions of nano-level colored pigments, adjusting the ratio of silicon-containing acrylic ultra-weather-resistant emulsion, white pigments and fillers, and additives, as well as adding silicon-containing acrylic ultra-weather-resistant emulsion with a three-dimensional network structure. It also features high elasticity, high environmental friendliness, color tunability, and the ability to be exposed.

[0096] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A highly flexible, iridescent, environmentally friendly, and exposing waterproof coating, characterized in that: The waterproof coating comprises the following components: water, white pigments and fillers, fillers, silicone-containing acrylic ultra-weather-resistant emulsion and additives, and optionally also includes nano-sized colored pigments; The white pigments and fillers include rutile titanium dioxide, and optionally also include hydrophobic fumed silica and / or alumina; The ultra-weather-resistant acrylic emulsion containing silicon comprises the following components: water, silicon-containing monomers, methyl methacrylate, butyl acrylate, acrylic acid, emulsifier, initiator, and buffer. The additives include silane coupling agents.

2. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 1, wherein, The waterproof coating comprises the following components by weight: 10-25 parts water, 1-15 parts white pigment and filler, 15-30 parts filler, 25-45 parts silicone acrylic ultra-weather-resistant emulsion, 5-15 parts additives, and 0-10 parts nano-grade colored pigments.

3. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 1 or 2, wherein, In the white pigment and filler, the weight ratio of rutile titanium dioxide to hydrophobic fumed silica is (0.5-15):(0-10). The filler is at least one of heavy calcium carbonate, barium sulfate, kaolin and quartz powder; preferably, the filler is a mixture of heavy calcium carbonate, barium sulfate and kaolin, wherein the weight ratio of heavy calcium carbonate, barium sulfate and kaolin is (10-15):(3-10):(3-5). The additives include the following components in parts by weight: 1-5 parts silane coupling agent, 0.1-1.5 parts defoamer, 3-4 parts dispersant, 0.1-1 parts wetting agent, 1-5 parts thickener, and 0-1 parts preservative.

4. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 1, wherein, The silicone-containing acrylic ultra-weather-resistant emulsion comprises the following components by weight: 20-60 parts water, 1-15 parts silicone monomer, 15-40 parts methyl methacrylate, 25-50 parts butyl acrylate, 1-10 parts acrylic acid, 1-10 parts emulsifier, 0.3-1 part initiator, and 0.1-1 part buffer.

5. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 1 or 4, wherein, The silicon-containing monomer is vinyltriethoxysilane and / or γ-methacryloyloxypropyltrimethoxysilane; The initiator is at least one of the following: potassium persulfate aqueous solution, ammonium persulfate aqueous solution, azobisisobutyronitrile, a mixture of hydrogen peroxide and ascorbic acid, 2-hydroxy-2-methyl-1-phenylpropanone, and sodium bisulfite aqueous solution; The buffer is at least one of sodium bicarbonate buffer solution, sodium carbonate buffer solution, sodium dihydrogen phosphate buffer solution, disodium hydrogen phosphate buffer solution, dipotassium hydrogen phosphate buffer solution, sodium pyrophosphate buffer solution, and triethanolamine buffer solution; The emulsifier is an ionic emulsifier or a nonionic emulsifier; preferably, the ionic emulsifier is at least one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium dioctyl succinate sulfonate, and hexadecyltrimethylammonium bromide; preferably, the nonionic emulsifier is nonylphenol polyoxyethylene ether and / or octylphenol polyoxyethylene ether.

6. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 1, wherein, The silicone-containing acrylic ultra-weather-resistant emulsion also includes a stabilizer, which is at least one of sodium bicarbonate aqueous solution, sodium hydroxide aqueous solution, and potassium hydroxide aqueous solution. The amount of stabilizer used is such that the pH of the silicone-containing acrylic ultra-weather-resistant emulsion is 7-8.

7. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 6, wherein, The preparation method of silicone-containing acrylic ultra-weather-resistant emulsion includes the following steps: S1: Mix water, emulsifier, and buffer thoroughly to obtain an emulsifier solution; mix the emulsifier solution with methyl methacrylate, butyl acrylate, acrylic acid, and silicon-containing monomers thoroughly to obtain a pre-emulsion; S2: Mix and stir a portion of the pre-emulsion with a portion of the initiator to carry out seed polymerization reaction. After the seed polymerization reaction system shows blue fluorescence, add the remaining portion of the pre-emulsion and the remaining portion of the initiator dropwise to the seed polymerization reaction system at a uniform rate. After the dropwise addition is completed, perform heat preservation treatment, and after cooling and filtration, obtain a silicone acrylic ultra-weather-resistant emulsion.

8. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 7, wherein, The weight of the pre-emulsion accounts for 10%-20% of the total weight of the pre-emulsion; The weight of the initiator accounts for 1 / 6 to 1 / 2 of the total weight of the initiator; The temperature for the seed polymerization reaction is 75-85℃; The heat preservation treatment is carried out at a temperature of 75-85℃ for 1-2 hours.

9. The highly flexible, iridescent, environmentally friendly, and exposing waterproof coating according to claim 7, wherein, The preparation method of the silicone-containing acrylic ultra-weather-resistant emulsion further includes: mixing and reacting the emulsion system cooled in step S2 with the stabilizer, and then filtering to obtain the silicone-containing acrylic ultra-weather-resistant emulsion.

10. The method for preparing the highly flexible, iridescent, environmentally friendly, and exposed waterproof coating according to any one of claims 1-9, characterized in that, The preparation method involves mixing and stirring water, white pigments and fillers, fillers, silicone-containing acrylic ultra-weather-resistant emulsion, additives, and optional nano-sized colored pigments evenly to obtain the highly flexible, iridescent, environmentally friendly, and exposing waterproof coating.

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