Long-acting anti-ultraviolet aging water-based multicolor paint and preparation method thereof

Abstract

The invention relates to a long-acting anti-ultraviolet aging water-based multicolor coating which comprises a continuous phase and a dispersed phase, the continuous phase comprises the following components: an emulsion, an anti-ultraviolet aid A, sand, an aid and water; the dispersed phase comprises a core material and a wall material, and the core material comprises the following components: an emulsion, an anti-ultraviolet auxiliary agent B and an auxiliary agent; the anti-ultraviolet additive A is obtained by reacting polyvinyl alcohol with an ultraviolet light absorber; the anti-ultraviolet additive B is obtained by mixing cellulose 1, cellulose 2 and a hindered amine light stabilizer; the problem that the anti-ultraviolet auxiliary agent is easy to migrate between two phases in the storage process is solved, and meanwhile, the loss of the anti-ultraviolet auxiliary agent is prevented in the service process after film formation. The stable combination of the anti-ultraviolet auxiliary agent and the coating matrix is ensured, so that the aging resistance of the coating is improved. And the process is simple, the cost is properly controlled, the production efficiency and competitiveness of the product can be ensured, and meanwhile, the requirements of the market for high-quality and low-cost products are met.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a long-lasting anti-ultraviolet aging water-based multi-color paint and a preparation method thereof. Background Art

[0002] As an important choice for modern people's exterior wall coatings, colorful paints have a broad market space. However, the current technological updates of exterior wall colorful paints have lagged far behind their development scale. For example, the increasingly serious ultraviolet challenge has put forward requirements for anti-ultraviolet performance. Exterior wall paints face severe aging environments, and coatings often deteriorate during service, seriously affecting the beauty and even safety of building exterior walls. Research on their aging is crucial to promote the upgrading of colorful paint products and further explore the colorful paint market. This is because:

[0003] (1) Severe UV test: UV rays are one of the main factors that cause colorful paint to age. Long-term exposure to ultraviolet rays can cause problems such as pigment decomposition and resin degradation in the paint, which in turn affects the color stability of the coating and the powdering and peeling of the paint film; (2) Aging and discoloration problems that affect the beauty of buildings: Colorful paints are widely used in the exterior wall decoration of buildings, and their color stability directly affects the appearance of the building. Once aging and discoloration occur, it not only destroys the design effect of the building, but may also leave a bad impression on users; (3) Aging problem of the overall coating: The aging of colorful paints not only affects its color, but may also cause yellowing, powdering, cracking and even shedding of the overall coating, thereby posing a safety hazard to the appearance and structure of the building.

[0004] In summary, the aging resistance of colorful coatings is one of the problems that need to be solved urgently. Through research and response to the ultraviolet test, color stability, overall aging of coatings and coordination with market demand of colorful coatings, we hope to provide the construction industry with more durable and beautiful coating materials and promote the sustainable development of colorful coatings for exterior walls.

[0005] In view of the severe aging environment faced by colorful exterior wall coatings, as the main film-forming material of exterior wall coatings, the current technical solution mainly determines the durability by screening emulsions. At present, styrene acrylic emulsions, pure acrylic emulsions, hydroxy acrylic emulsions, silicone acrylic emulsions, and fluorocarbon emulsions are mainly used for exterior walls. To expand:

[0006] Styrene acrylic emulsion has poor weather resistance, generally about 3-5 years. It is suitable for buildings with low weather resistance requirements. Styrene acrylic emulsion is made of styrene and acrylate copolymers. The monomer has poor UV resistance and is prone to photodegradation, so it has poor weather resistance.

[0007] Pure acrylic emulsion has good weather resistance, usually about 5-8 years. This is because pure acrylic emulsion is mainly polymerized from acrylic ester monomers. Acrylic ester molecules do not contain aromatic rings, have a stable structure and are not easily degraded by ultraviolet rays.

[0008] The weather resistance of hydroxypropyl emulsion is similar to that of pure acrylic, generally about 5-8 years, and is often used in coatings that need to be cross-linked and cured later. Hydroxypropyl emulsion is made by introducing hydroxyl groups into acrylate monomers, and its weather resistance is similar to that of pure acrylic emulsion;

[0009] Silicone acrylic emulsion: It has excellent weather resistance and water resistance, usually up to 8-10 years. This is because silicone acrylic emulsion is modified by introducing siloxane groups on the basis of acrylate, which improves the UV resistance and hydrophobicity of the siloxane groups, and can further improve the weather resistance and water resistance of the coating.

[0010] Fluorocarbon emulsion: Suitable for exterior wall coatings with high requirements, such as high-rise buildings and landmark buildings. Fluorocarbon emulsion is polymerized from fluorine-containing monomers and has a large number of CF bonds. This is because the bond energy of the CF bond is very high, much higher than the CH bond and CC bond, and is extremely stable and difficult to be degraded by ultraviolet rays. Fluorocarbon coatings therefore have excellent weather resistance and chemical resistance, which can usually last for 15-20 years or even longer. Fluorocarbon emulsions are expensive and are not suitable for architectural coatings.

[0011] As can be seen from the above, even if the most weather-resistant fluorocarbon emulsion is selected, regardless of the cost, it can only achieve a service life of 15-20 years. For a building with a lifespan of 50 years, it is still too short and will inevitably require subsequent high-cost renovation and maintenance. In view of this situation, it is urgent to develop a water-based exterior wall multi-color coating with a lifespan of 30 or even 50 years to improve the weather resistance of the exterior wall coating and reduce maintenance costs. To achieve this, it is difficult to achieve only by screening the emulsion, and it needs to be combined with anti-ultraviolet additives to achieve the desired effect.

[0012] like Figure 1 As shown in the figure, water-based multi-color paint is a multi-phase system with different compositions of dispersed phase and continuous phase, and faces different aging environments. Compared with single-phase systems such as latex paint, the multi-phase system of multi-color paint has complex compositions. This means that even if it is determined that the weather resistance of the paint film can be extended by adding anti-UV additives, the following problems can be solved: (1) the method of adding anti-UV additives; (2) according to the environment of dispersed phase and continuous phase, select anti-UV additives with different performance emphases to maximize the anti-aging performance; (3) at the same time, ensure the compatibility of anti-UV additives with their effective environment to avoid potential migration of anti-UV additives between different phases during storage and loss in the paint film after film formation, thereby affecting the actual weather resistance improvement effect, in order to achieve a significant improvement in the weather resistance of multi-color paint.

[0013] In summary, there is an urgent need to design a long-lasting anti-ultraviolet aging water-based multi-color coating to solve the problems existing in the prior art. Summary of the invention

[0014] Based on this, the present invention provides a long-lasting anti-ultraviolet aging water-based multi-color paint to overcome the shortcomings of the prior art. This technical solution significantly improves the aging performance of the multi-color paint, provides an important technical guarantee for extending the service life of the multi-color paint, and thus ensures that the water-based multi-color paint has a long-lasting color and a stable paint film.

[0015] One object of the present invention is to provide a long-lasting anti-ultraviolet aging water-based multi-color paint, wherein the long-lasting anti-ultraviolet aging water-based multi-color paint comprises a continuous phase and a dispersed phase; the continuous phase comprises the following components in parts by weight:

[0016]

[0017] The dispersed phase includes a core material and a wall material, and the core material includes the following components in parts by weight:

[0018] 20-30 parts of lotion

[0019] Anti-ultraviolet additive B 45-70 parts

[0020] Additives 0.1-15 parts;

[0021] in,

[0022] The anti-ultraviolet additive A is obtained by the reaction of polyvinyl alcohol and an ultraviolet absorber;

[0023] The anti-ultraviolet additive B is obtained by mixing cellulose 1, cellulose 2 and a hindered amine light stabilizer;

[0024] The mass ratio of the dispersed phase to the continuous phase is 4-7:1-3.

[0025] Furthermore, the material of the wall material includes granulated protective glue, and the granulated protective glue has the following general chemical structure formula:

[0026] [Si 8 (Mg 5.34 Li 0.66 ) 20 (OH) 4 ]Na 0.66 .

[0027] Furthermore, the emulsion is selected from one or more of styrene acrylic emulsion, pure acrylic emulsion, hydroxypropyl emulsion, and silicone acrylic emulsion.

[0028] Specifically, the anti-UV additives A and B have good compatibility with the coating system, ensuring the stability of the anti-UV additives A and B and preventing them from migrating between the dispersed phase and the continuous phase, strictly guaranteeing their high compatibility with water-based multi-color coatings and expanding their practical application value.

[0029] Furthermore, the cellulose 1 is selected from one or more of non-ionic ethyl hydroxyethyl cellulose, methyl hydroxyethyl cellulose, methyl hydroxypropyl cellulose, and hydroxyethyl cellulose ether.

[0030] Furthermore, the cellulose 2 is selected from one or more of hydroxyethyl cellulose, methyl cellulose and hydroxypropyl cellulose.

[0031] Furthermore, the viscosity of the cellulose 2 is 2800-3300 mPa.s.

[0032] Furthermore, the hindered amine light stabilizer is a type of organic amine compound with steric hindrance, which has a good inhibitory effect on the photo-oxidative degradation reaction of the coating and is a type of light stabilizer with excellent performance, such as DW-123(N) of BASF Chemicals and UV-7751W of Rianlon Chemicals.

[0033] Furthermore, the auxiliary agent is selected from one or more of a film-forming auxiliary agent, a dispersant, an antifreeze agent, a defoaming agent, a preservative, a thickener, titanium dioxide, kaolin, and an organic amine auxiliary agent.

[0034] The present invention also provides a method for preparing the long-lasting anti-ultraviolet aging water-based multi-color coating, comprising the following steps:

[0035] S1. Under heating conditions, adding a UV absorber to a polyvinyl alcohol solution, heating, and reacting to obtain an anti-UV additive A;

[0036] S2. Under heating conditions, cellulose 1 and cellulose 2 are added to the solvent and blended, and then a hindered amine light stabilizer is added, heated, stirred and mixed to obtain an anti-ultraviolet additive B;

[0037] S3. The anti-ultraviolet additive B, the emulsion and the additive are added to water, and then transferred to the protective colloid solution for granulation to obtain a dispersed phase;

[0038] S4. Add the emulsion and the additive into water and blend them, then add the anti-ultraviolet additive A and sand, mix them, and then add them into the dispersed phase to obtain the long-lasting anti-ultraviolet aging water-based multi-color coating.

[0039] Furthermore, in step S1, the heating temperature is 60-75°C, and the rising temperature is 85-95°C.

[0040] Furthermore, in step S2, the heating temperature is 55-70°C.

[0041] Furthermore, the defoaming agent is selected from one or more of polyether-modified dimethylsiloxane, polysiloxane and ethylene glycol siloxane.

[0042] Furthermore, the antifreeze agent is selected from one or more of propylene glycol and ethylene glycol butyl ether.

[0043] Furthermore, the film-forming aid is selected from one or more of alcohol ester dodecaned, propylene glycol butyl ether, dipropylene glycol methyl ether and benzyl alcohol.

[0044] Furthermore, the preservative is selected from one or more of 2-methyl-4-isothiazoline-3-one and 1,2-benzisothiazolin-3-one (BIT).

[0045] Furthermore, the calcined kaolin is selected from Snow's 80L.

[0046] Specifically, the long-lasting anti-UV water-based multi-color paint process of this technical solution is simple, and only minor adjustments are made to the original formula process. Existing multi-color paint manufacturers can produce this product without significantly changing the production line, ensuring the continuity of production and the benefits of achieving different levels of production on the same production line.

[0047] Specifically, according to the multi-phase characteristics of colorful coatings, suitable anti-UV additives are selected for different phases to determine the optimal addition amount:

[0048] The dispersed phase constitutes the colorful coating dots, usually containing pigments and fillers. It will be exposed to ultraviolet radiation during use, and is prone to fading, oxidation of pigments and aging of fillers. The continuous phase is a transparent water-based colorful coating, which generally does not contain pigments and fillers. Since there is no pigment and filler to scatter and absorb ultraviolet rays, it faces higher ultraviolet transmission and is more prone to aging of polymer segments than the dispersed phase. Hindered amine light stabilizers and ultraviolet light absorbers can both play an anti-ultraviolet role, but their mechanisms of action are different, which determines their applicability and the effectiveness of their performance:

[0049] Hindered amine light stabilizers: They can protect polymers or pigments from oxidation or degradation by capturing free radicals and peroxides in the light aging process and preventing the chain reaction of oxidation reactions. This mechanism enables hindered amine light stabilizers to more effectively protect pigments and polymers under long-term exposure to ultraviolet aging, making them more suitable for dispersed phases containing pigments and fillers.

[0050] UV absorber: Through strong UV absorption, it converts the energy of UV light into heat energy, preventing UV rays from damaging polymer chains. This mechanism enables UV absorbers to provide better protection in a short period of time, especially for direct damage caused by UV rays. The above specifically determines that UV absorbers are more suitable for continuous phases that do not contain pigments and fillers to ensure that they can play their maximum role.

[0051] In summary, for dispersed phases containing pigments, HALS are more effective in long-term exposure because they can continuously prevent oxidation and degradation reactions, thereby protecting the color and texture of the pigments. While UV absorbers can provide protection for a short period of time, their long-term effects are not as stable as HALS.

[0052] Since the colorful system is a complex multi-phase mixed system, even if the anti-UV additives suitable for different phase systems are determined, in order to ensure that the anti-UV additives do not migrate between phases during storage, and to ensure that the anti-UV additives are not lost too quickly in the paint film after film formation, it is necessary to make certain modifications to the existing anti-UV additives to make them suitable for the colorful system, so as to better make the weather-resistant colorful coatings meet the design expectations of the technical solution.

[0053] 1. Matching of hindered amine light stabilizers to colorful dispersed phases.

[0054] like Figure 2 As shown in (a)-(d), cellulose is a water-soluble rheological additive for the dispersed phase, which also cross-links with the protective colloid, so that the continuous phase of the base paint has a certain cohesion and thixotropy, which is sufficient to stabilize the dispersed phase components. At the same time, the hydrophobically modified cellulose can make the colorful continuous phase obtain a stable thickening effect, and the effect is outstanding. This is achieved based on the multiple hydroxyl groups in its molecular chain, and it can also produce a stable hydrogen bond anchoring effect with the hindered amine light stabilizer. This strong anchoring effect ensures that the hindered amine light stabilizer will not migrate out of the dispersed phase and will not be lost after film formation, thereby maximizing the anti-ultraviolet performance, ensuring the performance of the dispersed phase in the face of severe aging conditions, and ensuring that the pigments and fillers therein remain new over time.

[0055] 2. Matching of UV absorbers to colorful continuous phases.

[0056] like Figure 3As shown, as a water-soluble polymer material, polyvinyl alcohol is often used as an additive for coatings to enhance the flexibility, mechanical properties and tensile strength of the paint film. At the same time, as a water-soluble polymer material, it has good compatibility with water-based coatings. Therefore, the large number of hydroxyl groups in its chain segments can be used to complex and bond with anti-UV additives. While achieving efficient UV absorption, its larger molecular weight can effectively slow down the migration of UV absorbers from the continuous phase to the dispersed phase, as well as the loss from the paint film after film formation.

[0057] In both the dispersed phase and the continuous phase, the two anti-UV additives achieve "strong hydrogen bond anchoring" with the two phase systems at the molecular level. This micro-anchoring mechanism not only solves the problem of the anti-UV additives easily migrating between the two phases during storage, but also prevents the loss of the anti-UV additives during service after film formation. This molecular interaction ensures the stable combination of the anti-UV additives and the coating matrix, thereby improving the aging resistance of the coating. This technical solution fully considers the multi-phase characteristics and anti-aging requirements of colorful coatings, and optimizes the aging resistance of the dispersed phase and the continuous phase by optimizing the selection and addition method of anti-UV additives. This research result is not only of great theoretical significance, but also provides a feasible solution for actual coating production, and is expected to promote the development and progress of the colorful coatings industry.

[0058] In summary, the preparation of weather-resistant colorful coatings requires comprehensive consideration of the characteristics of colorful coatings, determining the selection and addition amount of anti-UV additives, and making necessary modifications to the anti-UV additives to prevent rapid migration and loss, so as to achieve the optimal performance and stability of weather-resistant colorful coatings and meet the needs of different application scenarios.

[0059] The present invention has the following beneficial effects:

[0060] The present invention uses an anti-ultraviolet additive A and an anti-ultraviolet additive B for compounding, and respectively adds the anti-ultraviolet additive A and the anti-ultraviolet additive B into a dispersed phase and a continuous phase; firstly, cellulose 1 and cellulose 2 are cross-linked with a hindered amine light stabilizer through hydrogen bonding to obtain the anti-ultraviolet additive B; due to the multiple hydroxyl groups in the molecular chains of cellulose 1 and cellulose 2, a stable hydrogen bond anchoring effect can be generated with the hindered amine light stabilizer; the strong anchoring effect ensures that the hindered amine light stabilizer will not migrate out of the dispersed phase and will not be lost after film formation, thereby maximizing the anti-ultraviolet performance. Ensure the performance of the dispersed phase in the face of severe aging conditions; secondly, by complexing polyvinyl alcohol with ultraviolet absorbers to obtain anti-ultraviolet additives A, due to the large number of hydroxyl groups in the chain segments of polyvinyl alcohol, the anti-ultraviolet additives are complexed and bonded, and high-line ultraviolet absorption is achieved; at the same time, by utilizing its larger molecular weight, it can effectively slow down the migration of ultraviolet absorbers from the continuous phase to the dispersed phase, as well as the loss from the paint film after film formation, solving the problem of anti-ultraviolet additives easily migrating between the two phases during storage, and also preventing the loss of anti-ultraviolet additives during service after film formation. This molecular-level interaction ensures the stable combination of anti-ultraviolet additives and the coating matrix, thereby improving the aging resistance of the coating. Moreover, the process is simple and the cost is properly controlled, which can ensure the production efficiency and competitiveness of the product, while meeting the market demand for high-quality, low-cost products. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic diagram of the problems existing in the water-based multi-color coating of the prior art;

[0062] Figure 2 (a) is a schematic diagram of the hydration principle of hydrogen bonds on cellulose and water;

[0063] Figure 2 (b) is a schematic diagram of the physical entanglement between cellulose chain segments;

[0064] Figure 2 (c) is a schematic diagram showing the association principle between hydrophobic segments on cellulose;

[0065] Figure 2 (d) is a schematic diagram showing the principle of hindered amine light stabilizer being confined in cellulose;

[0066] Figure 3 This is a schematic diagram of the combination of polyvinyl alcohol and ultraviolet absorber. DETAILED DESCRIPTION

[0067] In order to more clearly illustrate the technical solution of the present invention, the following examples are listed. Unless otherwise stated, the raw materials, reactions and post-treatment methods shown in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0068] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0069] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers expressing, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all cases by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary depending on the desired properties to be obtained by the present invention.

[0070] Polyvinyl alcohol, polyvinyl alcohol 1788.

[0071] UV-7740, ultraviolet absorber, was purchased from Tianjin Lianlong Chemical.

[0072] UV-7751W, hindered amine light stabilizer, was purchased from Tianjin Lianlong Chemical.

[0073] The granulation protective rubber has the following chemical structure formula:

[0074] [Si 8 (Mg 5.34 Li 0.66 ) 20 (OH) 4 ]Na 0.66 .

[0075] 2-Amino-2-methyl-1-propanol, organic amine auxiliary.

[0076] Dipropylene glycol methyl ether, film-forming aid.

[0077] Ethylene glycol butyl ether, antifreeze.

[0078] Ethylene glycol siloxane, defoaming agent.

[0079] 1,2-Benzisothiazoline-3-one, preservative.

[0080] 8W polyurethane thickener, thickener.

[0081] 2-Methyl-4-isothiazolin-3-one, preservative.

[0082] Polyacrylate ammonium salt, dispersant, D-26 hydrophobic copolymer ammonium salt dispersant, purchased from Puwei Additives.

[0083] Polyether modified dimethylsiloxane, 318 defoamer, polyether, purchased from San Nopco, Japan.

[0084] Calcined kaolin, Snow White 80L.

[0085] 90 mesh snowflake white sand, sand.

[0086] Propylene glycol, antifreeze.

[0087] Alcohol ester twelve, film-forming aid.

[0088] Hydroxyethyl cellulose ether, 250HBR, was purchased from Ashland.

[0089] Hydroxypropyl cellulose, TT935, was purchased from Rohm and Haas.

[0090] Example 1

[0091] A long-lasting anti-ultraviolet aging water-based multi-color paint, the long-lasting anti-ultraviolet aging water-based multi-color paint comprises a continuous phase and a dispersed phase, the mass ratio of the dispersed phase to the continuous phase is 6:2; the continuous phase comprises the following components in mass fractions:

[0092]

[0093]

[0094] The dispersed phase includes a core material and a wall material, wherein the wall material is a granulation protective glue solution; the core material includes the following components in parts by mass:

[0095]

[0096] The preparation method of the above-mentioned long-lasting anti-ultraviolet aging water-based multi-color coating comprises the following steps:

[0097] S1. Take 5 parts of polyvinyl alcohol and dissolve it in 25 parts of deionized water. Under the high-speed dispersion state of 1500rpm, add 1 part of D-26 hydrophobic copolymer ammonium salt dispersant, mix evenly, and heat to 60°C. At a speed of 500rpm, slowly add 0.8 parts of UV-774OW, heat to 90°C and reflux for 6h to obtain anti-ultraviolet additive A;

[0098] S2. At a speed of 900 r / min, 0.1 parts of hydroxyethyl cellulose ether and 0.1 parts of hydroxypropyl cellulose were dissolved in 98 parts of deionized water, and the temperature was raised to 60°C. Then, 0.05 parts of UV-7751W were dropped into the dispersed state, and the dispersion was continued for 30 minutes. Then, the stirring was stopped, and the solution was homogeneous to obtain an anti-ultraviolet additive B;

[0099] S3-1 at 900r / min speed, 5 parts of the granulation liquid protective gel was added to 95 parts of deionized water, stirred and then added 0.3 parts of DC-118 anti-settling agent, stirred to obtain a granulation protective gel solution;

[0100] S3-2 in a dispersed state, according to the mass fraction of the dispersed phase, the anti-ultraviolet additive B, the emulsion and the additive were added to deionized water, according to the dispersed phase and the granulation protective gel solution mass ratio of 40:30, the dispersed phase was added to the granulation protective gel solution pre-granulated to obtain a dispersed phase;

[0101] S4. According to the mass fraction of the continuous phase, the emulsion and the additive are added to the deionized water and blended, and then the anti-ultraviolet additive A and 90 mesh snowflake white sand are added, mixed, and then added to the dispersed phase and stirred evenly to obtain a water-based flat multi-color coating.

[0102] Example 2

[0103] A long-lasting anti-ultraviolet aging water-based multi-color paint, the long-lasting anti-ultraviolet aging water-based multi-color paint comprises a continuous phase and a dispersed phase, the mass ratio of the dispersed phase to the continuous phase is 6:2; the continuous phase comprises the following components in mass fractions:

[0104]

[0105] The dispersed phase includes a core material and a wall material, wherein the wall material is a granulation protective glue solution; the core material includes the following components in parts by mass:

[0106]

[0107] The preparation method of the above-mentioned long-lasting anti-ultraviolet aging water-based multi-color coating comprises the following steps:

[0108] S1. Take 5 parts of polyvinyl alcohol and dissolve it in 25 parts of deionized water. Under the high-speed dispersion state of 1500rpm, add 1 part of D-26 hydrophobic copolymer ammonium salt dispersant, mix evenly, and heat to 60°C. At a speed of 500rpm, slowly add 0.8 parts of UV-774OW, heat to 90°C and reflux for 6h to obtain anti-ultraviolet additive A;

[0109] S2. At a speed of 900 r / min, 0.1 parts of hydroxyethyl cellulose ether and 0.1 parts of hydroxypropyl cellulose were dissolved in 98 parts of deionized water, and the temperature was raised to 60°C. Then, 0.05 parts of UV-7751W were dropped into the dispersed state, and the dispersion was continued for 30 minutes. Then, the stirring was stopped, and the solution was homogeneous to obtain an anti-ultraviolet additive B;

[0110] S3-1 at 900r / min speed, 5 parts of the granulation liquid protective gel was added to 95 parts of deionized water, stirred and then added 0.3 parts of DC-118 anti-settling agent, stirred to obtain a granulation protective gel solution;

[0111] S3-2 in a dispersed state, according to the mass fraction of the dispersed phase, the anti-ultraviolet additive B, the emulsion and the additive were added to deionized water, according to the dispersed phase and the granulation protective gel solution mass ratio of 40:30, the dispersed phase was added to the granulation protective gel solution pre-granulated to obtain a dispersed phase;

[0112] S4. According to the mass fraction of the continuous phase, the emulsion and the additive are added to the deionized water and blended, and then the anti-ultraviolet additive A and 90 mesh snowflake white sand are added, mixed, and then added to the dispersed phase and stirred evenly to obtain a water-based flat multi-color coating.

[0113] Example 3

[0114] A long-lasting anti-ultraviolet aging water-based multi-color paint, the long-lasting anti-ultraviolet aging water-based multi-color paint comprises a continuous phase and a dispersed phase, the mass ratio of the dispersed phase to the continuous phase is 6:2; the continuous phase comprises the following components in mass fractions:

[0115]

[0116] The dispersed phase includes a core material and a wall material, wherein the wall material is a granulation protective glue solution; the core material includes the following components in parts by mass:

[0117]

[0118] The preparation method of the above-mentioned long-lasting anti-ultraviolet aging water-based multi-color coating comprises the following steps:

[0119] S1. Take 5 parts of polyvinyl alcohol and dissolve it in 25 parts of deionized water. Under the high-speed dispersion state of 1500rpm, add 1 part of D-26 hydrophobic copolymer ammonium salt dispersant, mix evenly, and heat to 60°C. At a speed of 500rpm, slowly add 0.8 parts of UV-774OW, heat to 90°C and reflux for 6h to obtain anti-ultraviolet additive A;

[0120] S2. At a speed of 900 r / min, 0.1 parts of hydroxyethyl cellulose ether and 0.1 parts of hydroxypropyl cellulose were dissolved in 98 parts of deionized water, and the temperature was raised to 60°C. Then, 0.05 parts of UV-7751W were dropped into the dispersed state, and the dispersion was continued for 30 minutes. Then, the stirring was stopped, and the solution was homogeneous to obtain an anti-ultraviolet additive B;

[0121] S3-1 at 900r / min speed, 5 parts of the granulation liquid protective gel was added to 95 parts of deionized water, stirred and then added 0.3 parts of DC-118 anti-settling agent, stirred to obtain a granulation protective gel solution;

[0122] S3-2 in a dispersed state, according to the mass fraction of the dispersed phase, the anti-ultraviolet additive B, the emulsion and the additive were added to deionized water, according to the dispersed phase and the granulation protective gel solution mass ratio of 40:30, the dispersed phase was added to the granulation protective gel solution pre-granulated to obtain a dispersed phase;

[0123] S4. According to the mass fraction of the continuous phase, the emulsion and the additive are added to the deionized water and blended, and then the anti-ultraviolet additive A and 90 mesh snowflake white sand are added, mixed, and then added to the dispersed phase and stirred evenly to obtain a water-based flat multi-color coating.

[0124] Comparative Example 1

[0125] The difference between this comparative example and Example 1 is that the mass of the anti-ultraviolet additive B in the dispersed phase is replaced by UV-7751W, and the other components and preparation methods are the same.

[0126] Comparative Example 2

[0127] The difference between this comparative example and Example 1 is that the anti-ultraviolet additive A in the continuous phase is replaced by an equal mass of polyvinyl alcohol and UV-774OW physically compounded in a ratio of 1:1, and the other components and preparation methods are the same.

[0128] Comparative Example 3

[0129] The difference between this comparative example and Example 1 is that this comparative example removes steps S3-1 and S3-2, that is, the components in the dispersed phase are blended with the components in the continuous phase, and the other components and preparation methods are the same.

[0130] Comparative Example 4

[0131] A water-based multi-color paint, Nippon paint textured granite stain-resistant paint QA372.

[0132] Test Case

[0133] The performance of the water-based multi-color coatings prepared in Examples 1-3 and Comparative Examples 1-4 was tested.

[0134] Test method:

[0135] Weather resistance: The coating was applied on a vinyl plate at room temperature and dried at room temperature for 24 hours to obtain a coating sample. A UVA light source was used with an irradiance of 1.3 W / m 2The coating samples were tested in the continuous operation mode of the radiation scene measuring instrument, and the time when the coating samples showed obvious signs of aging was recorded.

[0136] Washability: Tested according to method 5.15 of GB / T 9755-2014.

[0137] Water-whitening resistance: The water-based multi-color coatings prepared in Examples 1-3 and Comparative Examples 1-4 were respectively applied to vinyl plates at room temperature. After coating, the coating was dried at room temperature for 24 hours. Half of the coated sample was immersed in grade tertiary water for 24 hours. After the immersion was completed, the vinyl plate was taken out to observe the difference in whitening between the immersed area and the non-immersed area.

[0138] Construction performance: Observe the smoothness of the paint when it comes out of the gun, and whether there is gun clogging and sagging during the construction process.

[0139] The test results are shown in Table 1 below.

[0140] Table 1 Performance test results of water-based multi-color coatings of Examples 1-3 and Comparative Examples 1-4

[0141]

[0142] From the test results in the above table, it can be seen that the long-lasting anti-ultraviolet aging water-based multi-color coating and its preparation method provided by Examples 1-3 of the present invention have obvious advantages over existing products in the weather resistance tests of the dispersed phase, the continuous phase and the finished paint, which are specifically manifested as follows: Examples 1-3 ensure the formulation tolerance of the preparation of long-lasting anti-ultraviolet aging multi-color coatings; Comparative Examples 1-3 show that the preparation method and addition method of the anti-ultraviolet additive A for the dispersed phase and the anti-ultraviolet additive B for the continuous phase are extremely critical to the actual weather resistance of the coating, and the pre-preparation of the anti-ultraviolet additive A for the dispersed phase and the anti-ultraviolet additive B for the continuous phase are indispensable as key steps, which can effectively avoid the migration and loss of active ingredients. At the same time, the anti-ultraviolet additive A for the dispersed phase and the anti-ultraviolet additive B for the continuous phase do not have a negative impact on other properties of the paint film, such as water whitening resistance and scrub resistance, which verifies its high efficiency and compatibility.

[0143] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0144] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A long-lasting anti-ultraviolet aging water-based multi-color paint, characterized in that: The long-lasting anti-ultraviolet aging water-based multi-color coating comprises a continuous phase and a dispersed phase; The continuous phase includes the following components in parts by weight: The dispersed phase includes a core material and a wall material, and the core material includes the following components in parts by weight: Emulsion 20-30 parts Anti-ultraviolet additive B 45-70 parts Additives 0.1-15 parts; in, The anti-ultraviolet additive A is obtained by the reaction of polyvinyl alcohol and an ultraviolet absorber; The anti-ultraviolet additive B is obtained by mixing cellulose 1, cellulose 2 and a hindered amine light stabilizer; The mass ratio of the dispersed phase to the continuous phase is 4-7:1-3.

2. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: The material of the wall material includes granulated protective glue, and the granulated protective glue has the following chemical structure formula: [Si8(Mg 5.34 Li 0.66 )O 20 (OH)4]Na 0.66 .

3. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: The emulsion is selected from one or more of styrene acrylic emulsion, pure acrylic emulsion, hydroxypropyl emulsion and silicone acrylic emulsion.

4. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: The cellulose 1 is selected from one or more of non-ionic ethyl hydroxyethyl cellulose, methyl hydroxyethyl cellulose, methyl hydroxypropyl cellulose, and hydroxyethyl cellulose ether.

5. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: The cellulose 2 is selected from one or more of hydroxyethyl cellulose, methyl cellulose and hydroxypropyl cellulose.

6. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: The auxiliary agent is selected from one or more of a film-forming auxiliary agent, a dispersant, an antifreeze agent, a defoaming agent, a preservative, a thickener, titanium dioxide, kaolin, and an organic amine auxiliary agent.

7. The method for preparing the long-lasting anti-ultraviolet aging water-based multi-color coating according to any one of claims 1 to 6, characterized in that: The steps include: S1. Under heating conditions, adding a UV absorber to a polyvinyl alcohol solution, heating, and reacting to obtain an anti-UV additive A; S2. Under heating conditions, cellulose 1 and cellulose 2 are added to the solvent and blended, and then a hindered amine light stabilizer is added, heated, stirred and mixed to obtain an anti-ultraviolet additive B; S3. The anti-ultraviolet additive B, the emulsion and the additive are added to water, and then transferred to the protective colloid solution for granulation to obtain a dispersed phase; S4. Add the emulsion and the additive into water and blend them, then add the anti-ultraviolet additive A and sand, mix them, and then add them into the dispersed phase to obtain the long-lasting anti-ultraviolet aging water-based multi-color coating.

8. The method for preparing the long-lasting anti-ultraviolet aging water-based multi-color coating according to claim 7, characterized in that: In step S1, the heating temperature is 60-75°C, and the rising temperature is 85-95°C.

9. The method for preparing the long-lasting anti-ultraviolet aging water-based multi-color coating according to claim 7, characterized in that: In step S2, the heating temperature is 55-70°C.

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