A paint composition, its preparation and use

Abstract

The application discloses a paint composition and a preparation method and application thereof, and belongs to the technical field of paints. The paint composition provided by the application comprises the following raw materials in percentage by mass: 25-50% of a high-molecular polymer emulsion, 0.1-2% of a matt powder, 0.1-1.5% of a purple light stabilizer, 3-10% of an additive, and 40-70% of water; the high-molecular polymer emulsion contains particles with a hydrophilic surface and a hydrophobic interior; the matt powder is surface-modified nano silicon dioxide; and the purple light stabilizer comprises a benzotriazole compound and a hindered amine compound. The high-molecular polymer emulsion containing particles with a hydrophilic surface and a hydrophobic interior is selected as a main base material, the surface-modified nano silicon dioxide matt powder is combined, and the purple light stabilizer compounded with the benzotriazole compound and the hindered amine compound are combined, so that the obtained paint composition has good matt performance, stain resistance and washing resistance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coatings, and particularly relates to a paint composition, a preparation method and application thereof. BACKGROUND

[0002] With the continuous development of science and technology and social productivity, people's material living standards are improving, and the requirements for building exterior wall decoration are also increasing. Building materials are constantly innovating to meet market demand. In the field of building coatings, exterior wall decoration coatings have developed from single latex paint to textured and complex real stone sand paint, and then to colorful coatings with rich and varied colors. While high-end stone-like coatings with rich textures and varied colors dominate the exterior wall decoration surface, the stone-like coatings alone cannot meet the demand for stain resistance, weather resistance, and washability. The demand for multifunctional topcoat varnish to match stone-like coatings is increasing.

[0003] Currently, the topcoat varnish to match stone-like coatings in China has its own characteristics, but it is difficult to have multiple functions in one. After matching stone-like coatings, the surface roughness of the topcoat varnish reduces its performance, leading to problems such as dust accumulation and color change. In addition, stone-like coatings require careful construction techniques during construction, and different construction techniques and parameters can produce different effects. Different surface roughness can cause gloss differences, resulting in wall mottling, affecting delivery progress, and affecting market confidence. That is, the existing products have different surface roughness, which can cause dust accumulation, dirtiness, scratching, and flattening. The surface roughness is greatly affected by construction, and even with existing matte topcoat varnish, there are still differences in brightness at different angles, which cannot solve the problem of gloss mottling caused by inconsistent roughness due to construction factors. SUMMARY

[0004] To overcome the problems in the prior art, one of the purposes of the present application is to provide a paint composition that has good matte performance, can effectively improve the mottling problem caused by construction differences, and has good stain resistance and washability.

[0005] The second purpose of the present application is to provide a preparation method of the above-mentioned paint composition.

[0006] The third purpose of the present application is to provide a paint film formed by the above-mentioned paint composition.

[0007] The fourth purpose of the present application is to provide an application of the above-mentioned paint composition.

[0008] To achieve the above-mentioned purposes, the technical solution adopted by the present application is:

[0009] The first aspect of the present application provides a paint composition comprising the following raw materials by mass percentage: 25-50% of a high molecular polymer emulsion, 0.1-2% of a matting powder, 0.1-1.5% of a violet light stabilizer, 3-10% of an auxiliary agent, and 40-70% of water.

[0010] The high molecular polymer emulsion contains particles with hydrophilic surfaces and hydrophobic interiors.

[0011] The matting powder is surface-modified nano-silica.

[0012] The violet light stabilizer comprises benzotriazole compounds and hindered amine compounds.

[0013] The high molecular polymer emulsion used in the present application contains particles with hydrophilic surfaces and hydrophobic interiors, the hydrophilicity of the surfaces of the particles can greatly improve the wettability of rainwater on the surface of the coating, greatly improve the self-cleaning ability of the coating, and achieve extremely strong stain resistance; the hydrophobicity of the interiors of the particles can provide excellent water resistance; the matting powder uses surface-modified nano-silica, which has excellent transparency, thereby showing the color of stone-like paint and making the diffuse reflection effect of the surface of the paint film consistent, presenting full-matte, in addition, it can effectively improve the interfacial tension between latex particles during film formation, achieving the effect of defect repair and reinforcement, and improving the scratch resistance and wear resistance of the paint after film formation; as for the violet light stabilizer, benzotriazole compounds are often used as violet light absorbers, and hindered amine compounds are often used as light stabilizers, the benzotriazole compounds and hindered amine compounds used in the present application can play a synergistic effect, thereby protecting the coating from the influence of ultraviolet light, effectively preventing problems such as discoloration, powdering, and cracking, and prolonging the service life of the paint.

[0014] Preferably, in the paint composition, the mass percentage of the particles with hydrophilic surfaces and hydrophobic interiors is 6-13%, and further preferably 7-12%.

[0015] Preferably, in the paint composition, the high molecular polymer emulsion further contains particles with core-shell structures obtained by emulsion polymerization.

[0016] Preferably, in the paint composition, the mass percentage of the particles with core-shell structures obtained by emulsion polymerization is 22-32%, and further preferably 23-30%.

[0017] The particles with core-shell structures obtained by emulsion polymerization have a special structure, which can form a nanoscale rough surface when the emulsion is film-formed, thereby achieving an ideal matte effect.

[0018] Preferably, in the paint composition, the high molecular polymer emulsion comprises a water-based acrylate emulsion, a water-based polyurethane emulsion, or a combination thereof.

[0019] In the specific embodiment of the present application, the high-molecular polymer emulsion includes at least one of Bardach 8616, Rikkyo 1269A or Wanhua 6140; in the more specific embodiment of the present application, the high-molecular polymer emulsion includes at least two of Bardach 8616, Rikkyo 1269A or Wanhua 6140.

[0020] In the specific embodiment of the present application, Bardach 8616 is an acrylate high-molecular polymer emulsion developed by using surface super-hydrophilic technology, which has the characteristics of surface super-hydrophilicity and particle interior hydrophobicity, wherein the surface super-hydrophilicity endows the coating film with excellent stain resistance, and the particle interior hydrophobicity guarantees excellent water resistance; Rikkyo 1269A is an acrylate polymer emulsion polymerized by using a reactive emulsifier and a special monomer through seed emulsion polymerization and core-shell encapsulation polymerization process, which has a core-shell structure obtained by emulsion polymerization, and has outstanding water resistance and matte performance; Wanhua 6140 is a modified waterborne polyurethane dispersion without ethyl alkyl phenol APEO and N-methyl pyrrolidone NMP, which has high hardness, excellent wear resistance and water resistance.

[0021] Preferably, in the paint composition, the mass percentage of the high-molecular polymer emulsion is 28-45%; further preferably, 30-42%.

[0022] Preferably, in the paint composition, the surface modifier of the surface-modified nano-silica is selected from silane coupling agents; further preferably, the silane coupling agent includes at least one of γ-chloropropyl triethoxysilane, γ-propyl trimethoxysilane or γ-glycidyl ether propyl trimethoxysilane.

[0023] The matting powder used in the present application is a surface-modified nano-silica, which has good suspensibility, transparency, matting effect and excellent scratch and wear resistance, and through surface modification, it realizes easy dispersibility and surface amphiphilicity, thereby improving the wetting of the coating film surface by rainwater and the dust adhesion, and improving the stain resistance and self-cleaning ability of the paint film. Further, the silane coupling agent is used as the surface modifier, which is condensed with the hydroxyl groups on the surface of the nano-silica to form a silicon-oxygen bond, thereby reducing the polarity of the surface of the silica and improving the compatibility, and at the same time, due to the use of wetting agents and high-speed shearing dispersion in the preparation process of the paint composition, the dispersibility can be improved.

[0024] Preferably, in the paint composition, the surface-modified nano-silica includes Wanjing SP30T, Tongqi TQ80 or a combination thereof.

[0025] Preferably, in the paint composition, the mass percentage of the matting powder is 0.3-1.5%; further preferably, 0.5-1%.

[0026] Preferably, the violet light stabilizer in the paint composition is selected from Tiangong HS-CN32.

[0027] The violet light stabilizer described in the present application is preferably a high-efficiency composite violet light stabilizer, which can protect the coating from ultraviolet light through the synergistic effect of benzotriazole violet light absorber and hindered amine light stabilizer, effectively prevent discoloration, powdering, cracking and other problems, and prolong the service life of the paint.

[0028] Preferably, the mass percentage of the violet light stabilizer in the paint composition is 0.2-1%; further preferably 0.3-0.8%.

[0029] Preferably, the mass percentage of the auxiliary agent in the paint composition is 3.5-8%; further preferably 4-6%.

[0030] Preferably, the mass percentage of water in the paint composition is 45-65%; further preferably 50-60%.

[0031] Preferably, the paint composition comprises the following mass percentages of raw materials: 28-45% high molecular polymer emulsion, 0.3-1.5% matting powder, 0.2-1% violet light stabilizer, 3.5-8% auxiliary agent, 45-65% water.

[0032] Further preferably, the paint composition comprises the following mass percentages of raw materials: 30-42% high molecular polymer emulsion, 0.5-1% matting powder, 0.3-0.8% violet light stabilizer, 4-6% auxiliary agent, 50-60% water.

[0033] Preferably, the auxiliary agent in the paint composition comprises at least one of water-based auxiliary agent, wetting agent, antifreeze, film-forming auxiliary agent, preservative, defoaming agent or thickening agent; further preferably, the auxiliary agent in the paint composition comprises water-based auxiliary agent, wetting agent, antifreeze, film-forming auxiliary agent, preservative, defoaming agent and thickening agent.

[0034] Preferably, the water-based auxiliary agent in the auxiliary agent comprises Jinzhe A605, Dow AMP-95 or a combination thereof.

[0035] The water-based auxiliary agent described in the present application is a multifunctional auxiliary agent applied in a water-based system, which can efficiently thicken the system and improve film-forming property and brushability after high-speed shearing dispersion.

[0036] Preferably, the mass percentage of the water-based auxiliary agent in the paint composition is 0.1-1%; further preferably 0.3-0.8%.

[0037] Preferably, in the auxiliary agent, the wetting agent is selected from polyether modified siloxane; further preferably, the wetting agent comprises BYK-345, BYK-333 or a combination thereof.

[0038] The wetting agent described in the present application is selected from polyether modified siloxane, which is an organic silicon surfactant capable of greatly reducing surface tension and improving the wettability of the substrate, and has the functions of wetting and dispersing.

[0039] Preferably, in the paint composition, the mass percentage of the wetting agent is 0.1-1%; further preferably, it is 0.2-0.8%.

[0040] Preferably, in the auxiliary agent, the antifreeze agent is selected from alcohol liquid; further preferably, the antifreeze agent comprises ethylene glycol, propylene glycol or a combination thereof.

[0041] The antifreeze agent described in the present application is selected from alcohol liquid, which is miscible with water, and after mixing with water in a certain proportion, it can change the vapor pressure of the cooling water, greatly reduce the freezing point, and thus improve the antifreeze ability of the paint.

[0042] Preferably, in the paint composition, the mass percentage of the antifreeze agent is 0.1-1%; further preferably, it is 0.3-0.8%.

[0043] Preferably, in the auxiliary agent, the film-forming aid is selected from alcohol ester film-forming aid; further preferably, the film-forming aid comprises at least one of Run Tai twelve carbon alcohol ester, Dow COASOL or Dow COASOL 290.

[0044] The film-forming aid described in the present application is selected from alcohol ester film-forming aid, which has excellent compatibility with emulsion and high film-forming efficiency.

[0045] Preferably, in the paint composition, the mass percentage of the film-forming aid is 2.5-5%; further preferably, it is 2.8-4%.

[0046] Preferably, in the auxiliary agent, the preservative is selected from acidic preservative; further preferably, the preservative comprises at least one of Dow BIOBAN 623A, Dow BTNV2 or Tor AA2316.

[0047] The preservative described in the present application is selected from acidic preservative, which still has broad-spectrum bacteriostatic activity in high-pH systems, can quickly kill and long-term inhibit the growth and reproduction of bacteria (gram-positive and negative bacteria, etc.), mold (aspergillus niger, etc.) and yeast (candida albicans, etc.).

[0048] Preferably, in the paint composition, the mass percentage of the preservative is 0.05-0.8%; further preferably, it is 0.2-0.5%.

[0049] Preferably, in the auxiliary agent, the defoaming agent is selected from a polymer complex mineral oil defoaming agent; further preferably, the defoaming agent comprises BASF 2410AG, BASF 2410AC or a combination thereof.

[0050] The defoaming agent described in the present application is selected from a polymer complex mineral oil defoaming agent, which has the ability of rapid bubble breaking and microbubble breaking, and also has the function of wetting.

[0051] Preferably, in the paint composition, the mass percentage of the defoaming agent is 0.05-0.4%; further preferably, 0.08-0.2%.

[0052] Preferably, in the auxiliary agent, the thickening agent is selected from an associated thickening agent; further preferably, the associated thickening agent comprises a hydrophobically modified associated thickening agent and a nonionic associated thickening agent; more preferably, the hydrophobically modified associated thickening agent comprises Dow TT615, Dow TT935 or a combination thereof, and the nonionic associated thickening agent comprises Dow RM8W, Dow RL220 or a combination thereof.

[0053] The hydrophobically modified associated thickening agent described in the present application, by introducing hydrophobic groups on the ordinary ASE polymer molecules, causes association between the same molecules or different molecules to form micellar structures, achieving good thickening efficiency, and improving the sagging and delamination of the paint, and at the same time, the use of nonionic associated thickening agent can effectively improve the washability and leveling of the paint, and the nonionic associated thickening agent is preferably a nonionic associated polyurethane thickening agent.

[0054] Preferably, in the paint composition, the mass percentage of the thickening agent is 0.1-0.8%; further preferably, 0.15-0.5%.

[0055] Preferably, the paint composition comprises the following mass percentages of raw materials: 25-50% of high molecular polymer emulsion, 0.1-2% of matting powder, 0.1-1.5% of ultraviolet light stabilizer, 0.1-1% of water-based auxiliary agent, 0.1-1% of wetting agent, 0.1-1% of antifreeze agent, 2.5-5% of film-forming auxiliary agent, 0.05-0.8% of preservative, 0.05-0.4% of defoaming agent, 0.1-0.8% of thickening agent, and 40-70% of water.

[0056] Further preferably, the paint composition comprises the following mass percentages of the preparation raw materials: 28-45% high-molecular polymer emulsion, 0.3-1.5% matting powder, 0.2-1% violet light stabilizer, 0.3-0.8% water-based auxiliary agent, 0.2-0.8% wetting agent, 0.3-0.8% antifreezing agent, 2.8-4% film-forming auxiliary agent, 0.2-0.5% preservative, 0.08-0.2% defoaming agent, 0.15-0.5% thickening agent, and 45-65% water.

[0057] The second aspect of the present application provides a preparation method of the paint composition of the first aspect of the present application, comprising the following steps: mixing the preparation raw materials to obtain the paint composition.

[0058] Preferably, in the preparation method of the paint composition, the mixing is sequentially adding the auxiliary agent, the matting powder, the violet light stabilizer, and the high-molecular polymer emulsion in water and mixing them respectively.

[0059] Preferably, in the preparation method of the paint composition, when the auxiliary agent comprises the water-based auxiliary agent, the wetting agent, the antifreezing agent, the film-forming auxiliary agent, the preservative, and the defoaming agent, the mixing is sequentially adding the water-based auxiliary agent, the matting powder, the wetting agent, the violet light stabilizer, the film-forming auxiliary agent, the antifreezing agent, the high-molecular polymer emulsion, the defoaming agent, the preservative, and the thickening agent in water and mixing them respectively.

[0060] Preferably, in the preparation method of the paint composition, the rotation speed of the mixing is 400-1000 rpm.

[0061] Preferably, in the preparation method of the paint composition, the mixing time is 3-15 min.

[0062] The third aspect of the present application provides a paint film formed by the paint composition of the first aspect of the present application.

[0063] The fourth aspect of the present application provides an application of the paint composition of the first aspect of the present application in preparing a building paint.

[0064] Preferably, the building paint is a building outer wall paint; further preferably, a building outer wall decorative paint; and more preferably, a building outer wall finishing varnish.

[0065] The present application has the following beneficial effects:

[0066] The paint composition has good matte performance, stain resistance and wash resistance, can effectively improve the gloss problem of different light caused by construction difference, and can improve the ability of the coating to resist ultraviolet rays and increase the service life of the coating.

[0067] Specifically, compared with the prior art, the present application has the following advantages:

[0068] 1、The paint composition of the present application has the characteristics of full matte after forming a paint film, and the 60° gloss can be controlled below 5%, and the 80° gloss can be controlled below 10%.

[0069] 2、The paint composition of the present application can further improve the comprehensive performance of the paint after adding water-based additives, wetting agents, antifreeze agents, film-forming additives, preservatives, defoaming agents or thickening agents, etc., and the performance of the paint can be adjusted according to actual needs.

[0070] 3、The production raw materials used in the present application are low-VOC environmentally friendly raw materials, which are low-carbon and environmentally friendly. After being matched with existing building exterior wall stone-like coatings, the system can greatly improve the stain resistance and wash resistance of the system, so that the coating system has long-acting excellent decorative effect, and the gloss problem caused by the construction difference of the middle paint is solved by the full matte effect, which further improves the construction tolerance of the stone-like coating, thereby speeding up the construction progress and realizing early delivery. The paint composition of the present application has a wide application in the preparation of building coatings, especially building exterior wall coatings. DETAILED DESCRIPTION

[0071] The content of the present application will be further described in detail through specific examples. It should also be understood that the following examples are only used to further illustrate the present application, and cannot be understood as limiting the scope of protection of the present application. Some non-essential improvements and adjustments made by those skilled in the art according to the principles described in the present application are within the scope of protection of the present application. The following examples specifically show that the process parameters are only one example in the appropriate range, i.e. those skilled in the art can make appropriate selection within the range through the description herein, and are not limited to the specific data of the following examples. The raw materials, reagents or devices used in the following examples and comparative examples are commercially available or can be obtained by known methods unless otherwise specified.

[0072] In the specific embodiment of the present application, the high-molecular polymer emulsion includes a core-shell structure emulsion obtained by emulsion polymerization, and a surface hydrophilic and internal hydrophobic emulsion; the matting powder is selected from nano-silica SP30T modified by a silane coupling agent; the ultraviolet light stabilizer is selected from Tian Gong HS-CN32 compounded with a benzotriazole compound and a hindered amine compound; and the auxiliary agent includes an aqueous auxiliary agent Jinzhe A605, a wetting agent BYK-345, an antifreezing agent ethylene glycol, a film-forming auxiliary agent Dow COASOL, preservatives Dow BIOBAN 623A and Dow BTNV2, an antifoaming agent BASF 2410AC, and thickening agents Dow TT615 and Dow RM8W.

[0073] Example 1

[0074] The present example provides a paint composition, and the specific raw materials and amounts are shown in Table 1, and the paint composition is prepared by the following steps:

[0075] 1) Add pure water to the reaction container, and then sequentially add the multifunctional auxiliary agent and the matting powder at a rotation speed of 450 rpm, adjust the rotation speed to 1000 rpm, and disperse for 15 min;

[0076] 2) Adjust the rotation speed to 800 rpm, and then sequentially add the wetting dispersant, the ultraviolet light stabilizer, the film-forming auxiliary agent, and the antifreezing agent, disperse for 3 min after each auxiliary agent is added;

[0077] 3) At a rotation speed of 600 rpm, sequentially add the emulsion, the antifoaming agent, and the preservative, and adjust the rotation speed according to the stirring state, stir for 5 min after each addition;

[0078] 4) At a rotation speed of 900 rpm, add the thickening agent, adjust the rotation speed according to the stirring state, and stir for 10 min until the paint composition is obtained.

[0079] Example 2

[0080] The present example provides a paint composition, and the specific raw materials and amounts are shown in Table 1, and the paint composition is prepared by the following steps:

[0081] 1) Add pure water to the reaction container, and then sequentially add the multifunctional auxiliary agent and the matting powder at a rotation speed of 500 rpm, adjust the rotation speed to 1200 rpm, and disperse for 15 min;

[0082] 2) Adjust the rotation speed to 1000 rpm, and then sequentially add the wetting dispersant, the ultraviolet light stabilizer, the film-forming auxiliary agent, and the antifreezing agent, disperse for 3 min after each auxiliary agent is added;

[0083] 3) At a rotation speed of 600 rpm, sequentially add the emulsion, the antifoaming agent, and the preservative, and adjust the rotation speed according to the stirring state, stir for 5 min after each addition;

[0084] 4) At the speed of 800 rpm, add thickening agent, adjust the speed according to the stirring state, stir for 10 min, and then the paint composition is obtained.

[0085] Example 3

[0086] This example provides a paint composition, the specific raw materials and amounts are recorded in Table 1, and is prepared by the following steps:

[0087] 1) Add pure water to the reaction container, at the speed of 600 rpm, add multifunctional additives and flatting powder in turn, adjust the speed to 1200 rpm, and disperse for 20 min;

[0088] 2) Adjust the speed to 900 rpm, wet dispersant, ultraviolet stabilizer, film forming aid, and antifreeze agent, disperse for 3 min after adding each additive;

[0089] 3) At the speed of 600 rpm, add emulsion, defoaming agent, and preservative in turn, adjust the speed according to the stirring state, and stir for 5 min after adding each item;

[0090] 4) At the speed of 800 rpm, add thickening agent, adjust the speed according to the stirring state, stir for 10 min, and then the paint composition is obtained.

[0091] Table 1 Specific raw materials and amounts of Examples 1-3 (unit: mass percentage %)

[0092]

[0093] Comparative Example 1

[0094] This example provides a paint composition, which is different from Example 1 in that pure water is used instead of flatting powder Wanjing SP30T, and the rest of the raw materials and preparation method are the same as Example 1.

[0095] Comparative Example 2

[0096] This example provides a paint composition, which is different from Example 1 in that micron-sized silicon dioxide is used instead of flatting powder Wanjing SP30T, and the rest of the raw materials and preparation method are the same as Example 1.

[0097] Comparative Example 3

[0098] This example provides a paint composition, which is different from Example 1 in that pure propylene emulsion BLJ-940W emulsion is used instead of high molecular polymer emulsion Risheng 1269A and Badefu 8616, and the rest of the raw materials and preparation method are the same as Example 1.

[0099] Comparative Example 4

[0100] The example provides a paint composition, which is different from example 1 in that: using Bardif 8616 instead of sunrise 1269A, other raw materials and preparation method are same with example 1.

[0101] Comparative example 5

[0102] The example provides a paint composition, which is different from example 1 in that: using pure water instead of purple light stabilizer Tianquan HS-CN32, the rest of the raw materials and preparation method are same with example 1.

[0103] Comparative example 6

[0104] The example provides a paint composition, which is different from example 1 in that: using benzotriazole type purple light absorber UV-327 instead of purple light stabilizer Tianquan HS-CN32, the rest of the raw materials and preparation method are same with example 1.

[0105] Performance test

[0106] The paint compositions of examples 1-3 and comparative examples 1-5 were taken as test samples, and the following performance tests were carried out respectively:

[0107] 1. Washability: 5.4.14 washability test in HG / T 5065-2016 architectural coatings with varnish.

[0108] 2. Gloss: 60° and 85° gloss determination method in GB / T 9754-2007 determination of 20°, 60° and 85° specular gloss of paint films of pigmented coatings without metallic pigments.

[0109] 3. Light transmittance: 5.4.8 light transmittance test method in HG / T 5065-2016 architectural coatings with varnish.

[0110] 4. Stain resistance: 5.4.16 stain resistance test method in HG / T 5065-2016 architectural coatings with varnish.

[0111] 5. Artificial weather resistance: 5.4.18 artificial weather resistance test method in HG / T 5065-2016 architectural coatings with varnish.

[0112] The test results are shown in table 2.

[0113] Table 2 performance test results of paint compositions of examples 1-3 and comparative examples 1-5

[0114]

[0115]

[0116] From table 2, it can be seen that the proportions of emulsion and flatting powder are adjusted in examples 2 and 3, and the compositions obtained have properties close to those of example 1, wherein, in example 2, the proportion of emulsion is adjusted, the hydrophilic surface and hydrophobic interior polymerization emulsion is reduced, the stain resistance is slightly reduced, in example 3, the amount of flatting powder is increased, the gloss is slightly reduced, the matte performance is better, but the light transmittance is slightly reduced.

[0117] Compared with comparative example 1, example 1 uses silica for flatting treatment, and the gloss at different angles such as 60° and 80° is significantly dull, in addition, the silica improves the interfacial tension between latex particles during film formation, and the function of scratch resistance and wear resistance is achieved, so that the coating has excellent wash resistance.

[0118] Compared with comparative example 2, example 1 uses nano-silica flatting powder with a finer particle size, which is easier to disperse after surface modification and has better light transmittance and wash resistance after uniform distribution.

[0119] Compared with comparative example 3, example 1 reasonably uses the core-shell structured acrylate polymerization emulsion obtained by emulsion polymerization and the hydrophilic surface and hydrophobic interior polymerization emulsion, so that the surface has hydrophilicity, excellent stain resistance is obtained, and the interior hydrophobicity endows the coating with excellent water resistance and low water absorption.

[0120] Compared with comparative example 4, since only a single emulsion polymerization core-shell structured polymerization emulsion is used in comparative example 4, the surface hydrophilicity is not as good as that of example 1, and it is difficult to clean after staining by rainwater and the like.

[0121] Compared with comparative example 5, example 1 uses a violet light stabilizer, which can slow down the free radical chain photo-oxidation of high molecular materials under the action of ultraviolet light and oxygen, achieve anti-ultraviolet effect, effectively prevent paint film from powdering, discoloring, cracking and other problems, and prolong the service life of the system.

[0122] Compared with comparative example 6, example 1 uses a violet light stabilizer compounded with a benzotriazole-based violet light absorber and a hindered amine light stabilizer, which can convert light energy into a nitrogen-oxygen free radical and capture the alkyl active free radical generated in the photo-oxidation of the paint film, inhibit the chain reaction and thus achieve a protective effect, and reduce the problems of paint film powdering and cracking.

[0123] The present application selects a hydrophilic surface and hydrophobic interior particle-containing polymerization emulsion as the main base material, combines a surface-modified nano-silica flatting powder and a violet light stabilizer compounded with a benzotriazole compound and a hindered amine compound, and obtains a paint composition with good matte performance, stain resistance and wash resistance, which can effectively improve the uneven gloss problem caused by construction differences, and can improve the ability of the coating to resist ultraviolet light and increase the service life of the coating.

[0124] And, the production raw materials used in the application are all low-VOC environmentally-friendly raw materials, low-carbon and environmentally-friendly, after matching with existing building exterior wall stone-like paint, the system can greatly improve the stain resistance and washability, so that the coating system has long-acting excellent decorative effect, and solves the gloss defect influence caused by the construction difference of the middle paint through the full matte effect, further improves the construction tolerance of the stone-like paint, thereby speeds up the construction progress and realizes early delivery. The paint composition of the application has a wide application in the preparation of building paint, especially building exterior wall paint.

Claims

1. A paint composition, characterized in that, The preparation raw materials include the following percentages by weight: 25-50% polymer emulsion, 0.1-2% matting agent, 0.1-1.5% UV stabilizer, 3-10% additives, and 40-70% water; The polymer emulsion contains particles that are hydrophilic on the surface and hydrophobic on the inside; the polymer emulsion also contains core-shell structured particles obtained by emulsion polymerization; in the paint composition, the mass percentage of the particles that are hydrophilic on the surface and hydrophobic on the inside is 6-13%, and the mass percentage of the core-shell structured particles obtained by emulsion polymerization is 22-32%. The matting powder is surface-modified nano-silica; the surface modifier of the surface-modified nano-silica is selected from silane coupling agents; the silane coupling agent includes at least one of γ-chloropropyltriethoxysilane, γ-propyltrimethoxysilane or γ-glycidoxypropyltrimethoxysilane. The light stabilizers include benzotriazole compounds and hindered amine compounds.

2. The paint composition according to claim 1, characterized in that, The polymer emulsion includes aqueous acrylic emulsion, aqueous polyurethane emulsion, or a combination thereof.

3. The paint composition according to claim 1, characterized in that, The additives include water-based additives.

4. The paint composition according to claim 1, characterized in that, The additives include at least one of wetting agents, antifreeze agents, film-forming aids, preservatives, defoamers, or thickeners.

5. The paint composition according to claim 4, characterized in that, The wetting agent is selected from polyether-modified siloxanes; the antifreeze agent is selected from alcohol liquids; the film-forming aid is selected from alcohol ester film-forming aids; the preservative is selected from acidic preservatives; the defoamer is selected from polymer composite mineral oil defoamers; and the thickener is selected from associative thickeners.

6. A method for preparing the paint composition according to any one of claims 1 to 5, characterized in that, Includes the following steps: The raw materials are mixed to obtain the paint composition.

7. A paint film, characterized in that, The paint film is formed from the paint composition according to any one of claims 1 to 5.

8. The use of the paint composition according to any one of claims 1 to 5 in the preparation of architectural coatings.

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