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

Abstract

The present application relates to the long-acting anti-ultraviolet aging water-based multicolor paint includes continuous phase and dispersed phase;The continuous phase includes the following components: emulsion, anti-ultraviolet auxiliary A, sand, auxiliary, water;The dispersed phase includes core material and wall material, the core material includes components: emulsion, anti-ultraviolet auxiliary B, auxiliary;The anti-ultraviolet auxiliary A is obtained by the reaction of polyvinyl alcohol and ultraviolet absorber;The anti-ultraviolet auxiliary B is obtained by mixing cellulose 1, cellulose 2 and hindered amine light stabilizer;Solve the problem that anti-ultraviolet auxiliary is easy to migrate between two phases during storage, also prevent the loss of anti-ultraviolet auxiliary during the service process after film forming. Ensure the stable combination of anti-ultraviolet auxiliary and paint matrix, thereby improving the aging resistance of the paint. Moreover, the process is simple, the cost is controlled properly, the production efficiency and competitiveness of the product can be ensured, and the demand of the market for high-quality, low-cost products can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building technology, in particular to a long-acting anti-ultraviolet aging water-based multi-color paint and a preparation method thereof. BACKGROUND

[0002] Multi-color paint is an important choice for modern people to paint the exterior wall, and has a broad market space. However, the current technical update of the exterior wall multi-color paint has far lagged behind its development scale, for example, the increasingly serious challenge of ultraviolet light requires anti-ultraviolet performance. The exterior wall paint is facing a severe aging environment, and the coating often deteriorates during service, which seriously affects the appearance and even the safety of the building exterior wall. The study on the aging of the building exterior wall is crucial to promote the upgrading of multi-color paint products and further tap the market of multi-color paint. This is because:

[0003] (1) Severe ultraviolet test: ultraviolet light is one of the main factors leading to the aging of multi-color paint. Long-term irradiation of ultraviolet light can cause decomposition of pigments and degradation of resins in the paint, thereby affecting the color stability of the coating and causing paint film to powder and fall off; (2) Aging discoloration problem affecting the appearance of the building: multi-color paint is widely used in the decoration of the exterior wall of the building, and the color stability directly affects the appearance of the building. Once the aging discoloration occurs, not only the design effect of the building is destroyed, but also the user may have a bad impression; (3) Overall coating aging problem: the aging of multi-color paint not only affects its color, but also can cause the overall coating to yellow, powder, crack and even fall off, thereby bringing safety hazards to the appearance and structure of the building.

[0004] In summary, the aging resistance problem of multi-color paint is one of the problems to be solved at present. Through research and response to the ultraviolet test of multi-color paint, color stability, overall coating aging and coordination with market demand, a more durable and beautiful coating material for the building industry can be provided, and the sustainable development of the exterior wall multi-color paint can be promoted.

[0005] In view of the severe aging environment faced by the exterior wall multi-color paint, as the main film-forming material of the exterior wall paint, the current technical solution mainly determines the durability by screening emulsions. Currently, styrene-acrylic emulsion, pure acrylic emulsion, hydroxypropyl emulsion, silicone-acrylic emulsion and fluorocarbon emulsion are mainly used for exterior wall.

[0006] The styrene-acrylic emulsion has poor weather resistance, generally about 3-5 years. It is suitable for buildings with low weather resistance requirements. The styrene-acrylic emulsion is copolymerized by styrene and acrylic ester, and the monomer has poor ultraviolet resistance and is prone to photodegradation, so the weather resistance is poor.

[0007] The weather resistance of pure acrylic emulsion is good, usually about 5-8 years, which is because the pure acrylic emulsion is mainly polymerized from acrylic ester monomers, the acrylic ester molecules do not contain aromatic ring, the structure is stable and not easy to be degraded by ultraviolet light;

[0008] The weather resistance of hydroxypropyl emulsion is similar to that of pure acrylic, usually 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 acrylic ester monomers, and its weather resistance is similar to that of pure acrylic emulsion;

[0009] Silicone-acrylic emulsion: has excellent weather resistance and water resistance, usually up to 8-10 years, which is because the silicone-acrylic emulsion is modified by introducing siloxane groups on the basis of acrylic ester, so that the ultraviolet resistance and hydrophobicity of siloxane groups are improved, which can further improve the weather resistance and water resistance of the coating.

[0010] Fluorocarbon emulsion: suitable for high requirement exterior wall coatings, such as high-rise buildings, landmark buildings. Fluorocarbon emulsion is polymerized from fluorine-containing monomers, which has many C-F bonds. Because the bond energy of C-F bond is very high, much higher than that of C-H bond and C-C bond, it is extremely stable and difficult to be degraded by ultraviolet light. Fluorocarbon coating therefore has excellent weather resistance and chemical resistance, usually up to 15-20 years or even longer, and fluorocarbon emulsion is expensive and not suitable for building coatings.

[0011] As can be seen above, even if the most weather-resistant fluorocarbon emulsion is selected, regardless of cost, only 15-20 years of service life can be achieved, which is still too short for a building life of 50 years, and subsequent high-cost renovation and maintenance are inevitable. In view of this situation, it is urgent to develop water-based exterior wall multi-color coatings with a service life of 30 years 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 rely on the selection of emulsion alone, and the addition of anti-ultraviolet additives is needed to achieve the expected effect.

[0012] As shown in Figure 1 , water-based multi-color coatings are a multi-phase system, the dispersed phase and the continuous phase have different compositions and face different aging environments. Compared with single-phase systems such as latex paint, the multi-phase system of multi-color coatings is complex, which determines that even if it is determined to extend the weather resistance of the paint film by adding anti-ultraviolet additives, the following problems must be solved: (1) the addition method of anti-ultraviolet additives; (2) for the environment of the dispersed phase and the continuous phase, select anti-ultraviolet additives with different performance emphasis to maximize the anti-aging performance; (3) at the same time, ensure the compatibility of anti-ultraviolet additives with their effective environment, avoid the potential migration of anti-ultraviolet additives between different phases during storage and loss in the paint film after film formation, so as to affect the actual weather resistance improvement effect, so as to obviously improve the weather resistance of multi-color coatings.

[0013] In summary, there is an urgent need to design a long-lasting UV-resistant and aging-resistant 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, UV-resistant, and aging-resistant water-based multi-color coating to overcome the shortcomings of existing technologies. This technical solution significantly improves the aging performance of multi-color coatings, providing an important technical guarantee for extending the service life of multi-color coatings, thereby ensuring the long-lasting color and stable paint film of water-based multi-color coatings.

[0015] One object of the present invention is to provide a long-lasting UV-resistant and aging-resistant water-based multi-color coating, wherein the long-lasting UV-resistant and aging-resistant water-based multi-color coating 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 mass:

[0018] 20-30 parts of emulsion

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

[0020] 0.1-15 parts of additives;

[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 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 chemical structure formula:

[0026] [Si8(Mg 5.34 Li 0.66 )O 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-ultraviolet aid A and the anti-ultraviolet aid B are compatible with the coating system, the stability of the anti-ultraviolet aid A and the anti-ultraviolet aid B is ensured, the anti-ultraviolet aid A and the anti-ultraviolet aid B cannot migrate between the dispersed phase and the continuous phase, the high adaptability of the water-based multi-color coating is strictly ensured, and the practical application value is expanded.

[0029] Further, 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] Further, the cellulose 2 is selected from one or more of hydroxyethyl cellulose, methyl cellulose, and hydroxypropyl cellulose.

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

[0032] Further, the hindered amine light stabilizer is a kind of organic amine compound with steric hindrance, has a good inhibitory effect on the photo-oxidation reaction of the coating, and is a kind of excellent light stabilizer, such as DW-123(N) of BASF Chemical and UV-7751W of Lianlong Chemical.

[0033] Further, the aid is selected from one or more of film-forming aids, dispersants, antifreezes, antifoaming agents, preservatives, thickening agents, titanium white, kaolin, and organic amine aids.

[0034] The application also provides a preparation method of the long-acting anti-ultraviolet aging water-based multi-color coating.

[0035] S1. Under the condition of heating, the ultraviolet absorber is added into the polyvinyl alcohol solution, heated, reacted, and the anti-ultraviolet aid A is obtained;

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

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

[0038] S4. The emulsion and the aid are added into water and blended, and then the anti-ultraviolet aid A and sand are added, mixed, and then added into the dispersed phase to obtain the long-acting anti-ultraviolet aging water-based multi-color coating.

[0039] Further, in step S1, the heating temperature is 60-75 DEG C, and the heating temperature is 85-95 DEG C.

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

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

[0042] Further, the antifreezing agent is selected from one or more of propylene glycol, ethylene glycol butyl ether.

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

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

[0045] Further, the calcined kaolin is selected from 80L of white snow.

[0046] Specifically, the long-acting anti-ultraviolet water-based multi-color paint process of the technical solution is simple, only the original formula process is fine-tuned, and existing multi-color paint production enterprises can produce the product without greatly changing the production line, ensuring the continuity of production and the benefits of producing different grades on the same production line.

[0047] Specifically, for the multi-phase characteristics of multi-color paint, suitable anti-ultraviolet additives are selected for different phases, and the optimal addition amount is determined.

[0048] Among them, the dispersed phase constitutes the color points of the multi-color coating, usually containing pigments and fillers, which will be exposed to ultraviolet radiation in the use process, and prone to problems such as fading, oxidation of pigments and aging of fillers. The continuous phase is a transparent water-based multi-color paint, which generally does not contain pigments and fillers. Since there is no scattering and absorption of ultraviolet rays by pigments and fillers, it faces a higher ultraviolet transmission, and the aging of the polymer chain segment is more likely to occur than the dispersed phase. Hindered amine light stabilizers and ultraviolet light absorbers can both play a role in anti-ultraviolet, but their mechanisms of action are different, thus determining their applicable scope and performance effectiveness:

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

[0050] UV absorbers: By strong UV absorption, the energy of UV light is converted into heat, preventing the UV light from damaging the polymer chain segments. This mechanism allows UV absorbers to provide better protection in a short time, especially for direct damage caused by UV light. The above characteristics determine that UV absorbers are more suitable for the continuous phase of a system without pigments and fillers, to ensure their maximum effect.

[0051] In summary, for the dispersed phase containing pigments, hindered amine light stabilizers are more effective under long-term exposure, as they can continuously prevent oxidation and degradation reactions, thereby protecting the color and texture of the pigments. While UV absorbers can provide protection in a short time, their long-term effect is not as stable as hindered amine light stabilizers.

[0052] Since the multi-color system is a complex multi-phase mixed system, even if suitable anti-UV additives for different phase systems are determined, in order to ensure that there is no migration of anti-UV additives between phases during storage, and to ensure that anti-UV additives are not lost too quickly in the paint film after film formation, certain modifications need to be made to existing anti-UV additives to adapt to the multi-color system, so that the weather-resistant multi-color coating better meets the design expectations of the technical solution.

[0053] 1. Matching of hindered amine light stabilizers for multi-color dispersed phase.

[0054] As shown in Figure 2 (a)-(d), cellulose is a water-soluble rheological additive for the dispersed phase, which also crosslinks with the protective glue, thereby giving the base paint continuous phase certain cohesion and thixotropy, sufficient to make the dispersed phase components exist stably, while the hydrophobically modified cellulose will give the multi-color continuous phase a stable thickening effect, which is outstanding. This is based on the multiple hydroxyl groups present in its molecular chain, which can also form stable hydrogen bond anchoring effects with hindered amine light stabilizers. This strong anchoring effect ensures that the hindered amine light stabilizer does not migrate out of the dispersed phase and is not lost after film formation, thereby maximizing the anti-UV performance, ensuring the performance of the dispersed phase under harsh aging conditions, and ensuring that the pigments and fillers in it remain fresh over time.

[0055] 2. Matching of UV absorbers for multi-color continuous phase.

[0056] As shown in Figure 3As 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. As a water-soluble polymer material, it has good compatibility with water-based coatings. Therefore, by utilizing the large number of hydroxyl groups in its chain segments, it can complex and bond with the anti-ultraviolet additives, achieving high-efficiency ultraviolet absorption. At the same time, by utilizing its large molecular weight, it can effectively slow down the migration of ultraviolet absorbers from the continuous phase to the dispersed phase and the loss of ultraviolet absorbers from the paint film after film formation.

[0057] In the dispersed phase and the continuous phase, both anti-ultraviolet additives achieve "strong hydrogen bond anchoring" at the molecular level with the two-phase system. This micro-anchoring mechanism not only solves the problem of easy migration of anti-ultraviolet additives between the two phases during storage, but also prevents the loss of anti-ultraviolet additives during service after film formation. This molecular-level interaction ensures the stable combination of anti-ultraviolet additives with 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 multi-color coatings and optimizes the aging resistance of the dispersed phase and the continuous phase by optimizing the selection and addition of anti-ultraviolet additives. This research result not only has important theoretical significance, but also provides a feasible solution for actual coating production, which is expected to promote the development and progress of the multi-color coating industry.

[0058] In summary, the preparation of weather-resistant multi-color coatings needs to consider the characteristics of multi-color coatings and determine the selection and addition of anti-ultraviolet additives. Necessary modifications are made to the anti-ultraviolet additives to prevent rapid migration and loss, thereby achieving the optimal performance and stability of weather-resistant multi-color coatings and meeting the needs of different application scenarios.

[0059] The present application has the following advantages:

[0060] The application is compounded by using anti-ultraviolet assistant A and anti-ultraviolet assistant B, and adding the anti-ultraviolet assistant A and the anti-ultraviolet assistant B in the dispersed phase and the continuous phase respectively; first, the cellulose 1 and the cellulose 2 are crosslinked with the hindered amine light stabilizer through hydrogen bonding to obtain the anti-ultraviolet assistant B, and the multiple hydroxyl groups existing in the molecular chains of the cellulose 1 and the cellulose 2 can produce stable hydrogen bonding anchoring effect with the hindered amine light stabilizer, so that the strong anchoring effect ensures that the hindered amine light stabilizer cannot migrate out of the dispersed phase and be lost after film formation, thereby maximizing the anti-ultraviolet performance and ensuring the performance of the dispersed phase under harsh aging conditions; second, the polyvinyl alcohol is complexed with the ultraviolet absorber to obtain the anti-ultraviolet assistant A, and a large number of hydroxyl groups existing in the chain segments of the polyvinyl alcohol realize the complexing and bonding of the anti-ultraviolet assistant, and high ultraviolet absorption is realized; at the same time, the large molecular weight can effectively slow down the migration of the ultraviolet absorber from the continuous phase to the dispersed phase and the loss of the ultraviolet absorber from the paint film after film formation, solving the problem that the anti-ultraviolet assistant is easy to migrate between the two phases during storage, and preventing the loss of the anti-ultraviolet assistant during the service process after film formation. The molecular level interaction ensures the stable combination of the anti-ultraviolet assistant and the coating matrix, thereby improving the aging resistance of the coating. Moreover, the process is simple, the cost is controlled properly, the production efficiency and competitiveness of the product can be ensured, and the demand of the market for high-quality and low-cost products can be met. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 (a) is a schematic diagram of the hydrogen bonding of cellulose and water;

[0062] Figure 2 (a) is a schematic diagram of the hydrogen bonding of 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 of the association between the hydrophobic chain segments on the cellulose;

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

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

[0067] In order to more clearly illustrate the technical solutions of the present application, the following examples are listed. Unless otherwise stated, the raw materials, reactions and post-treatment means appearing in the examples are common raw materials on the market and technical means familiar to those skilled in the art.

[0068] The words "preferred" and "preferably" in the present invention refer to embodiments of the present invention that can provide certain benefits under certain circumstances. However, other embodiments can also be preferred under the same or other circumstances. Additionally, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude those other embodiments from the scope of the present invention.

[0069] It should be understood that all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as approximations based on the desired properties sought to be obtained by the present invention. It will be further understood that the individual values and ranges for quantities, properties and other specifications that are set forth in the following specification and attached claims are preliminary and are subject to change.

[0070] Polyvinyl alcohol, polyvinyl alcohol 1788.

[0071] UV-7740, ultraviolet absorber, purchased from Tianjin Li'anlong Chemical.

[0072] UV-7751W, hindered amine light stabilizer, purchased from Tianjin Li'anlong Chemical.

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

[0074] [Si8(Mg 5.34 Li 0.66 )O 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 silicone, defoaming agent.

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

[0080] 8W polyurethane thickener, thickener.

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

[0082] Polyacrylic acid ammonium salt, dispersant, D-26 hydrophobic copolymer ammonium salt dispersant, purchased from Puwei Auxiliary.

[0083] Polyether modified dimethyl silicone, 318 defoaming agent, polyether, purchased from Japan Shengnuopu.

[0084] Calcined kaolin, white snow 80L.

[0085] 90 mesh snow white sand, sand.

[0086] Propylene glycol, antifreeze agent.

[0087] Alcohol ester twelve, film forming aid.

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

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

[0090] Example 1

[0091] A long-acting anti-ultraviolet aging water-based multicolor paint, the long-acting anti-ultraviolet aging water-based multicolor paint comprises a continuous phase and a dispersed phase, the mass ratio of the dispersed phase and the continuous phase is 6:2; the continuous phase comprises components in the following mass fraction:

[0092]

[0093]

[0094] The dispersed phase comprises a core material and a wall material, the material of the wall material is a granulation protective colloid solution; the core material comprises components in the following mass fraction:

[0095]

[0096] The preparation method of the above long-acting anti-ultraviolet aging water-based multicolor paint comprises the following steps:

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

[0098] S2. Dissolve 0.1 parts of hydroxyethyl cellulose ether and 0.1 parts of hydroxypropyl cellulose in 98 parts of deionized water at a speed of 900 r / min, and heat to 60°C, then drop 0.05 parts of UV-7751W under dispersion state, continue to disperse for 30 min, then stop stirring, the solution is homogeneous, to obtain an anti-ultraviolet additive B;

[0099] S3-1. Add 5 parts of granulation liquid protective colloid to 95 parts of deionized water at a speed of 900 r / min, stir uniformly, then add 0.3 parts of DC-118 anti-settling agent, stir uniformly to obtain a granulation protective colloid solution;

[0100] S3-2. In a dispersed state, anti-ultraviolet additive B, emulsion and additive are added to deionized water by mass fraction of the dispersed phase, the dispersed phase is added to the pre-pelletizing protective colloid solution according to the mass ratio of the dispersed phase to the pelletizing protective colloid solution of 40:30, and the dispersed phase is obtained by pre-pelletizing the dispersed phase into the pelletizing protective colloid solution;

[0101] S4. The emulsion, additive are added to deionized water for blending, and then anti-ultraviolet additive A and 90-mesh snow-white sand are added, mixed, and then added to the dispersed phase, and stirred uniformly to obtain the water-based planar multi-color coating.

[0102] Example 2

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

[0104]

[0105] The dispersed phase comprises a core material and a wall material, the material of the wall material is a pelletizing protective colloid solution; the core material comprises the following components by mass fraction:

[0106]

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

[0108] S1. 5 parts of polyvinyl alcohol are dissolved in 25 parts of deionized water, 1 part of D-26 hydrophobic copolymer ammonium salt dispersant is added under high-speed dispersion at 1500 rpm, mixed uniformly, and heated to 60°C, 0.8 parts of UV-774OW is slowly added at a speed of 500 rpm, heated to 90°C for reflux reaction for 6 hours to obtain anti-ultraviolet additive A;

[0109] S2. 0.1 parts of hydroxyethyl cellulose ether and 0.1 parts of hydroxypropyl cellulose are dissolved in 98 parts of deionized water at a speed of 900 r / min, and heated to 60°C, then 0.05 parts of UV-7751W is added dropwise under dispersion, and continues to be dispersed for 30 min, then the stirring is stopped, and the solution is homogeneous, to obtain anti-ultraviolet additive B;

[0110] S3-1. 5 parts of pelletizing liquid protective colloid are added to 95 parts of deionized water at a speed of 900 r / min, 0.3 parts of DC-118 anti-settling agent is added after stirring uniformly to obtain a pelletizing protective colloid solution;

[0111] S3-2. In a dispersed state, anti-ultraviolet additive B, emulsion and additive are added into deionized water according to the mass fraction of the dispersed phase, the dispersed phase is added into the prilling protective colloid solution according to the mass ratio of the dispersed phase to the prilling protective colloid solution of 40:30, and the dispersed phase is obtained by pre-prilling;

[0112] S4. Emulsion and additive are added into deionized water for blending, anti-ultraviolet additive A and 90-mesh snow white sand are added, and then the dispersed phase is added after mixing, and the water-based flat multi-color coating is prepared after stirring uniformly.

[0113] Example 3

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

[0115]

[0116] The dispersed phase comprises a core material and a wall material, the material of the wall material is a prilling protective colloid solution; the core material comprises the following components in mass fraction:

[0117]

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

[0119] S1. 5 parts of polyvinyl alcohol are dissolved in 25 parts of deionized water, 1 part of D-26 hydrophobic copolymer ammonium salt dispersant is added under high-speed dispersion at 1500 rpm, and the mixture is uniformly mixed and heated to 60°C, 0.8 parts of UV-774OW is slowly added at a speed of 500 rpm, and the temperature is raised to 90°C for reflux reaction for 6 hours to obtain anti-ultraviolet additive A;

[0120] S2. 0.1 parts of hydroxyethyl cellulose ether and 0.1 parts of hydroxypropyl cellulose are dissolved in 98 parts of deionized water at a speed of 900 r / min, and the temperature is raised to 60°C, then 0.05 parts of UV-7751W is added dropwise under dispersion, and the dispersion is continued for 30 min, then the stirring is stopped, and the solution is homogeneous, to obtain anti-ultraviolet additive B;

[0121] S3-1. 5 parts of prilling liquid protective colloid are added to 95 parts of deionized water at a speed of 900 r / min, 0.3 parts of DC-118 anti-settling agent is added after stirring uniformly, and the prilling protective colloid solution is obtained after stirring uniformly;

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

[0123] S4. The emulsion and additive were added into deionized water for blending, and then anti-ultraviolet additive A and 90-mesh snow white sand were added and mixed, and then the dispersed phase was added and stirred uniformly to obtain the water-based flat multi-color paint.

[0124] Comparative Example 1

[0125] The difference between this comparative example and Example 1 is that the anti-ultraviolet additive B in the dispersed phase is replaced by an equal amount of 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 amount of 1:1 physically compounded polyvinyl alcohol and UV-774OW, 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 steps S3-1 and S3-2 are removed, i.e. 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, which is a Lianbang textured granite stain-resistant paint QA372.

[0132] Test Example

[0133] The water-based multi-color paints prepared in Examples 1-3 and Comparative Examples 1-4 were tested for performance.

[0134] Test Method:

[0135] Weather resistance: The paint was applied to a vinyl board at room temperature, and the coating was dried at room temperature for 24 h to obtain a coating sample, a UVA light source was used, the irradiance was set to 1.3 W / m 2 , and the coating sample was tested in the continuous operation mode of the irradiance meter, and the time when the coating sample showed obvious signs of aging was recorded.

[0136] Washing resistance: The test was carried out according to the method of 5.15 in GB / T 9755-2014.

[0137] Water whitening resistance: The waterborne multicolor coatings prepared by Examples 1-3 and Comparative Examples 1-4 were respectively applied on the ethylene board at room temperature, and after film coating, the coatings were dried at room temperature for 24 h, then half of the coating sample was immersed in the tertiary water for 24 h, after the immersion, the ethylene board was taken out, and the whitening difference between the immersed area and the non-immersed area was observed.

[0138] Construction performance: the gun smoothness during use of the coating was observed, and whether the gun blocking and sagging occurred during construction was observed.

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

[0140] Table 1 Performance test results of the waterborne multicolor 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-acting anti-ultraviolet aging waterborne multicolor coating and the preparation method thereof provided by Examples 1-3 have obvious advantages compared with the existing products in the dispersion phase, the continuous phase and the weather resistance test of the finished paint, which specifically shows that: Examples 1-3 ensure the formulation tolerance of the preparation of long-acting anti-ultraviolet aging multicolor coating; from Comparative Examples 1-3, it is shown that the preparation method and the adding method of the anti-ultraviolet additive A for the dispersion phase and the anti-ultraviolet additive B for the continuous phase are extremely critical for the actual weather resistance of the coating, and the pre-preparation of the anti-ultraviolet additive A for the dispersion phase and the anti-ultraviolet additive B for the continuous phase as a key step is indispensable, which can effectively avoid the migration and loss of active ingredients. At the same time, the anti-ultraviolet additive A for the dispersion phase and the anti-ultraviolet additive B for the continuous phase do not have negative effects on other performances of the paint film such as water whitening resistance and washability, which verifies the high efficiency and compatibility thereof.

[0143] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in a descriptive sense only and not for purposes of limitation. The scope of the present application is defined by the appended claims rather than by the foregoing description, and it is intended that all changes that come within the meaning and range of equivalents are embraced therein.

[0144] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

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 comprises the following components in parts by weight: 40-60 parts of emulsion Anti-ultraviolet additive A 45-60 parts 0-10 parts sand 0.1-20 parts of additives 20-30 parts water; The dispersed phase includes a core material and a wall material, and the core material includes the following components in parts by mass: 20-30 parts of emulsion Anti-ultraviolet additive B 45-70 parts 0.1-15 parts of additives; 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 hindered amine light stabilizer; The mass ratio of the dispersed phase to the continuous phase is 4-7:1-3; The material of the wall material is a granulated protective glue solution; The preparation method of the long-lasting anti-ultraviolet aging water-based multi-color coating comprises the following steps: S1. Under heating conditions, a UV absorber is added to the polyvinyl alcohol solution, the temperature is raised, and the reaction is performed 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, and stirred to obtain an anti-UV agent B; S3. The anti-UV additive B, the emulsion and the additive are added to water, and then transferred to the granulation protective gel solution for granulation to obtain a dispersed phase; S4. Add the emulsion and the additives to water and blend them, then add the anti-ultraviolet additive A and sand, mix them, and then add them to the dispersed phase to obtain the long-lasting anti-ultraviolet aging water-based multi-color coating.

2. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: The wall material includes granulated protective rubber, which has the following general chemical structure: [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 long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: In step S1, the heating temperature is 60-75°C, and the temperature of the rising temperature is 85-95°C.

8. The long-lasting anti-ultraviolet aging water-based multi-color paint according to claim 1, characterized in that: In step S2, the heating temperature is 55-70°C.

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