Anti-shedding environment-friendly wall paint and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and discloses an anti-falling environment-friendly wall paint and a preparation method thereof.The wall paint is composed of, by weight, 30-40 parts of composite resin, 10-20 parts of nanoscale filler, 10-20 parts of auxiliaries and 10-20 parts of additives. 10 to 14 parts of a nano-scale filling material; 5-10 parts of an auxiliary agent; the preparation method comprises the following steps: preparing the composite resin, the nano-scale filler, the auxiliary agent and the additive according to the weight parts of the formula, putting the composite resin and the nano-scale filler into a high-speed dispersion kettle, setting stirring conditions, adding the auxiliary agent twice, adding the additive again, adjusting the stirring conditions, forming a mixed system, adding the thickening agent and the deionized water to adjust the viscosity, forming a mixed material, and uniformly stirring. The preparation method comprises the following steps: adding the raw materials into a stirrer for stirring, adjusting the acid-base balance of the materials, carrying out curing treatment, carrying out defoaming operation on the cured materials under a vacuum condition for 15-20 minutes, completing the preparation of the wall paint, and finally detecting that the wall paint has the advantages of low VOC emission, no formaldehyde, no benzene, excellent adhesive force and strong weather resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and specifically to an environmentally friendly wall paint resistant to peeling and its preparation method. Background Art

[0002] With the increasing attention of people to the health and safety of the indoor environment, the environmental friendliness of wall paint has become an important consideration factor for consumers when choosing products. However, the existing wall paints still have deficiencies in terms of environmental friendliness. Many wall paint products contain harmful substances such as volatile organic compounds (VOCs), formaldehyde, benzene, etc. These substances not only pose a threat to human health but also cause environmental pollution. While pursuing environmental protection, the adhesion performance of wall paint is also an urgent problem to be solved. Especially in some complex environments, such as high temperature, high humidity, large temperature difference changes, etc., the wall paint is prone to peeling. This not only affects the beauty of the wall but also may cause the failure of the wall protection function, increasing the maintenance cost and potential safety hazards. Therefore, it is particularly important to develop a wall paint product that is both environmentally friendly and has excellent adhesion performance. This research aims to provide an environmentally friendly wall paint resistant to peeling and its preparation method to overcome the defects of the existing technology and meet the market demand for high-performance and environmentally friendly wall paints. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] In view of the deficiencies of the existing technology, the present invention provides an environmentally friendly wall paint resistant to peeling and its preparation method, which has the advantages of low VOC emissions, no formaldehyde, no benzene, excellent adhesion, and strong weather resistance, and solves the problems of poor environmental friendliness, insufficient adhesion, and easy peeling in complex environments of the existing wall paints.

[0005] (2) Technical Solutions

[0006] To achieve the above object, the present invention provides the following technical solution: An environmentally friendly wall paint resistant to peeling, the wall paint is composed of a composite resin, nano-scale fillers, additives, and auxiliaries, and the weight fraction range of its raw materials is: 30 - 40 parts of composite resin; 10 - 14 parts of nano-scale fillers; 5 - 10 parts of additives; 7 - 9 parts of auxiliaries.

[0007] Preferably, the composite resin is jointly composed of a solvent-free resin, an ethylene-vinyl acetate copolymer emulsion, an aqueous polyurethane dispersion, and an organosilicon-modified acrylic emulsion, and its composition ratio is 3:3:3:1.

[0008] Preferably, the nano-scale fillers are composed of nano-titanium dioxide, nano-montmorillonite, and nano-kaolin, and its composition ratio is 1:5:5.

[0009] Preferably, the auxiliary agent is composed of a dispersant, an antifoaming agent, a thickener, a film-forming auxiliary agent and a pH regulator, and the composition ratio is 3:2:5:1:1.

[0010] Preferably, the dispersant is selected from polycarboxylate dispersants, the antifoaming agent is selected from polyether antifoaming agents, the thickener is selected from one or two of hydroxyethyl cellulose, xanthan gum or guar gum, the film-forming auxiliary agent is selected from vegetable oil-based film-forming auxiliary agents, and the pH regulator is selected from organic amine-based pH regulators.

[0011] Preferably, the additive is composed of a leveling agent, a drier, an ultraviolet absorber and an antibacterial agent, and the composition ratio is 3:4:3:2.

[0012] Preferably, the leveling agent is selected from one of potassium perfluorobutanesulfonate or fluorine-containing block polyester leveling agents, the drier is selected from one of Borchi OXY-Coat series driers or waterborne composite driers, the ultraviolet absorber is selected from one or two of benzotriazole ultraviolet absorbers or triazine ultraviolet absorbers, and the antibacterial agent is selected from one or two of lactic acid, citric acid or silver ion antibacterial agents.

[0013] A preparation method of an anti-shedding environmental protection wall paint comprises the following preparation steps:

[0014] Step 1, prepare raw materials: Prepare a composite resin, a nano-level filler, an auxiliary agent and an additive according to the formula weight parts;

[0015] Step 2, premix the raw materials: Put the composite resin and the nano-level filler into a high-speed dispersion kettle, set the temperature of the dispersion kettle to 25-35 °C, the rotation speed to 800-1200 r / min, and the stirring time to 20-30 min to form a uniform slurry;

[0016] Step 3, add the auxiliary agent: Add the auxiliary agent in two times. First, add the dispersant and shear it at a rotation speed of 1200-1500 r / min for 10 min, and then add the antifoaming agent and the film-forming auxiliary agent, and reduce the rotation speed to 500-600 r / min and stir for 15 min;

[0017] Step 4, add the additive: After adding the antifoaming agent, use the pulse feeding method to alternately add the leveling agent, the drier, the ultraviolet absorber and the antibacterial agent to form a mixed system, and keep the temperature of the mixed system between 25-35 °C;

[0018] Step 5, adjust the viscosity: After adding the thickener, adjust the rotation speed to 300-400 r / min and stir for 15 min, use deionized water to adjust the viscosity of the mixed system, reduce the rotation speed to 100-200 r / min and stir for 20 min to make the viscosity of the mixed system reach between 4500-5000 cP to form a mixed material;

[0019] Step 6. Acid-base balance: Use a pH regulator to adjust the pH of the mixed materials to between 8.5 and 9.2 to form the mixed materials;

[0020] Step 7. Aging treatment: Transfer the mixed materials after acid-base balance to a heat preservation reaction kettle, and stir and age at a temperature of 45 ± 2°C for 1.5 - 2.5 h at a rotation speed of 200 - 250 r / min;

[0021] Step 8. Filtration: The aged materials are successively passed through stainless steel filter meshes with 200 meshes, 400 meshes, and 800 meshes;

[0022] Step 9. Vacuum degassing: Conduct degassing operation under a vacuum condition of -0.05 to -0.08 MPa for 15 - 20 min, and the wall paint is prepared;

[0023] Step 10. Detection: Detect the VOC content, adhesion, and temperature resistance and deformation of the prepared wall paint;

[0024] Step 11. Sub-packaging: The qualified wall paint after detection is filled according to the specifications and the packaging labels are made well.

[0025] Preferably, the raw materials of the wall paint and their parts by weight are: 36 parts of composite resin; 13 parts of nano-level filler; 9 parts of auxiliary agent; 7 parts of additive.

[0026] Preferably, the raw materials of the wall paint and their parts by weight are: 30 parts of composite resin; 11 parts of nano-level filler; 6 parts of auxiliary agent; 8 parts of additive.

[0027] Compared with the prior art, the present invention provides an anti-peeling and environmentally friendly wall paint and its preparation method, which has the following beneficial effects:

[0028] 1. By adopting a solvent-free resin, ethylene-vinyl acetate copolymer emulsion, waterborne polyurethane dispersion, and silicone-modified acrylic emulsion, the present invention forms a solvent-free resin system, and uses a vacuum degassing process to achieve a very low VOC content, and formaldehyde and benzene series compounds are not detected. Through the above environmentally friendly resin system and vacuum degassing process, it helps to reduce the VOC, formaldehyde, and benzene series compound contents of the wall paint, thereby achieving true environmental protection and pollution-free, and being applicable to places with extremely high environmental protection requirements.

[0029] 2. The present invention adopts a step-by-step shearing process and aging crosslinking treatment to make the adhesion of the wall paint reach level 0, which is far superior to the adhesion of the traditional process. Through the step-by-step shearing and aging crosslinking processes, the adhesion and durability of the wall paint are improved, so that it can still maintain good adhesion in complex environments (such as temperature and humidity changes), and is not easy to crack, peel, or fade, thereby prolonging the service life of the wall paint.

[0030] 3. The present invention realizes the improvement of the film hardness and the enhancement of the antibacterial and mildew-proof performance by compounding nano-titanium dioxide, nano-montmorillonite and nano-kaolin. Among them, nano-montmorillonite improves the leveling property of the paint film and avoids the orange peel phenomenon, while nano-kaolin can still maintain a mildew-proof grade of 0 in a humid and hot environment. Therefore, through the compounding of nano-fillers, the present invention further optimizes the hardness, wear resistance, antibacterial and mildew-proof performance and surface flatness of the paint film, thereby enhancing the overall decoration and protection of the wall paint, and enabling it to maintain good performance in a humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a preparation flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1 , an environmentally friendly wall paint that prevents peeling. The wall paint is composed of a composite resin, nano-scale fillers, auxiliaries and additives, and the weight part range of its raw materials is: 30-40 parts of composite resin; 10-14 parts of nano-scale fillers; 5-10 parts of auxiliaries; 7-9 parts of additives.

[0034] Specifically, the composite resin is jointly composed of a solvent-free resin, an ethylene-vinyl acetate copolymer emulsion, an aqueous polyurethane dispersion and a silicone-modified acrylic emulsion, and its composition ratio is 3:3:3:1. The composite resin composed of the above resins has an environmentally friendly film-forming substance and can form a firm and environmentally friendly paint film on the wall. Among them, the ethylene-vinyl acetate copolymer emulsion can improve the flexibility of the paint film, the aqueous polyurethane dispersion enhances the wear resistance and water resistance of the paint film, and the silicone-modified acrylic emulsion endows the paint film with good weather resistance.

[0035] Advantages: The present invention adopts a solvent-free resin, an ethylene-vinyl acetate copolymer emulsion, an aqueous polyurethane dispersion and a silicone-modified acrylic emulsion to form a solvent-free resin system, and uses a vacuum degassing process to achieve a very low VOC content, and formaldehyde and benzene series compounds are not detected. Through the above environmentally friendly resin system and vacuum degassing process, it helps to reduce the VOC, formaldehyde and benzene series compound content of the wall paint, thereby achieving true environmental protection and pollution-free, and is applicable to places with extremely high environmental protection requirements.

[0036] Specifically, the nano-scale filler is composed of nano-titanium dioxide, nano-montmorillonite, and nano-kaolin, and their composition ratio is 1:5:5. The nano-scale filler formulated with the above materials not only enhances the abrasion resistance of the wall paint, improves the hardness of the paint film, and enhances the adhesion of the wall paint, but also effectively prevents the wall paint from peeling off. Among them, nano-titanium dioxide can fill the pores of the paint film, thus effectively enhancing the hardness of the paint film, enabling the wall paint to still maintain good hardness after long-term use, reducing the wear of the paint film caused by factors such as daily friction, and further extending the service life of the wall paint. During the coating process of the wall paint, nano-montmorillonite improves the flow smoothness of the paint, enabling the paint to spread more evenly on the wall, avoiding the appearance of sagging and orange peel defects, thereby ensuring the flatness and smoothness of the paint film surface. At the same time, nano-montmorillonite can also enhance the adhesion between the wall paint and the wall, allowing the paint film to firmly adhere to the wall. Even under the influence of environmental factors such as humidity changes and temperature fluctuations, it is not easy to peel and fall off. Nano-kaolin has the functions of antibacterial and mildew-proof, as well as enhancing the light resistance and weather resistance of the paint film. In a humid environment, nano-kaolin can inhibit the growth of mold, keep the wall paint clean and hygienic, and prevent the paint film from discoloring and peeling due to mold reproduction. Under long-term light and climate change conditions, it can keep the paint film with stable performance, not easy to age, fade, etc., ensuring that the decorative effect of the wall paint remains as new for a long time.

[0037] The advantages are as follows: By compounding nano-titanium dioxide, nano-montmorillonite, and nano-kaolin as nano-fillers, the present invention realizes the improvement of the hardness of the paint film and the enhancement of the antibacterial and mildew-proof performance. Among them, nano-montmorillonite improves the leveling property of the paint film and avoids the orange peel phenomenon, while nano-kaolin can still maintain 0-level mildew-proof in a humid and hot environment. Therefore, through the compounding of nano-fillers, the present invention further optimizes the hardness, abrasion resistance, antibacterial and mildew-proof performance, and surface flatness of the paint film, thereby enhancing the overall decorative and protective properties of the wall paint, enabling it to still maintain good performance in a humid environment.

[0038] Specifically, the additives are jointly composed of a dispersant, an antifoaming agent, a thickener, a film-forming aid, and a pH regulator, and their composition ratio is 3:2:5:1:1. The additive mixture system without formaldehyde and benzene formulated with the above materials can ensure that the wall paint meets high standards in terms of environmental protection performance and reduces the pollution of the indoor environment. Among them, the dispersant can ensure the uniform dispersion of pigments and fillers, the antifoaming agent helps to eliminate the bubbles generated during the production process, the thickener helps to adjust the viscosity of the paint, the film-forming aid can promote the fusion of resin particles into a film, and the pH regulator can stabilize the paint mixing system of all material combinations.

[0039] Specifically, the dispersant is selected from polycarboxylate dispersants, the defoamer is selected from polyether defoamers, the thickener is selected from one or two of hydroxyethyl cellulose, xanthan gum or guar gum, the film-forming aid is selected from vegetable oil-based film-forming aids, and the pH regulator is selected from organic amine-based pH regulators.

[0040] Specifically, the additive is composed of a leveling agent, a drier, an ultraviolet absorber and an antibacterial agent. The additive composed of the above materials can improve the leveling property of the wall paint, adjust the drying speed, enhance the weather resistance of the paint film and improve the antibacterial and mildew-proof performance of the wall paint. Among them, the leveling agent makes the paint form a smooth and flat paint film after construction, the drier accelerates the drying of the paint film, the ultraviolet absorber prevents the paint film from aging due to ultraviolet irradiation, and the antibacterial agent inhibits the growth of bacteria and molds.

[0041] Specifically, the leveling agent is selected from one of potassium perfluorobutanesulfonate or fluorine-containing block polyester leveling agents, the drier is selected from one of Borchi OXY-Coat series driers or waterborne composite driers, the ultraviolet absorber is selected from one or two of benzotriazole ultraviolet absorbers or triazine ultraviolet absorbers, and the antibacterial agent is selected from one or two of lactic acid, citric acid or silver ion antibacterial agents.

[0042] Specifically, a preparation method of an anti-peeling environmental protection wall paint includes the following preparation steps:

[0043] Step 1, prepare raw materials: Prepare composite resin, nano-level filler, additives and additives according to the formula weight parts, ensure that the quality of various raw materials meets the requirements and the weighing is accurate, and make full preparations for the subsequent preparation work;

[0044] Step 2, premix the raw materials: Put the composite resin and the nano-level filler into a high-speed dispersion kettle, set the temperature of the dispersion kettle at 25-35 °C, the rotation speed at 800-1200 r / min, and the stirring time at 20-30 min to form a uniform slurry. Through such operations, the composite resin and the nano-level filler are fully mixed to form a uniform slurry, laying a good foundation for the subsequent processes;

[0045] Step 3, add additives: Add additives in two times. First, add the dispersant and shear at a rotation speed of 1200-1500 r / min for 10 min to make the dispersant better play its dispersing role. Then, add the defoamer and the film-forming aid, and reduce the rotation speed to 500-600 r / min and stir for 15 min to make the defoamer and the thickener evenly dispersed in the mixing system, playing the corresponding roles of eliminating bubbles and adjusting viscosity;

[0046] Step 4. Adding additives: After adding the defoamer, using the pulse feeding method, add the leveling agent, dryer, ultraviolet absorber, and antibacterial agent alternately to form a mixed system, and keep the temperature of the mixed system between 25 - 35°C to ensure that the additives can be evenly and stably incorporated into the mixed system, endowing it with corresponding functional characteristics;

[0047] Step 5. Adjusting viscosity: After adding the thickener, adjust the rotation speed to 300 - 400 r / min and stir for 15 min. Use deionized water to adjust the viscosity of the mixed system, then reduce the rotation speed to 100 - 200 r / min and stir for 20 min to make the viscosity of the mixed system reach between 4500 - 5000 cP, forming a mixed material (measurement conditions: 25°C, rotor LV4), ensuring that the wall paint has a suitable construction viscosity for subsequent painting operations;

[0048] Step 6. Acid-base balance: Use a pH-regulator to adjust the pH of the mixed material to between 8.5 - 9.2 to form a mixed material, ensuring the stability of the wall paint during storage and use and its good adaptability to the substrate;

[0049] Step 7. Aging treatment: Transfer the mixed material after acid-base balance to a heat-insulated reaction kettle, and stir and age at a temperature of 45 ± 2°C and a rotation speed of 200 - 250 r / min for 1.5 - 2.5 h to allow the components to further fully blend and react, improving the comprehensive performance of the wall paint;

[0050] Step 8. Filtration: The aged material is successively passed through stainless steel filters with 200 meshes, 400 meshes, and 800 meshes to remove any possible impurities, ensuring the purity and quality of the wall paint and avoiding adverse effects of impurities on the paint's performance and the final painting effect;

[0051] Step 9. Vacuum degassing: Conduct degassing operations under a vacuum condition of -0.05 to -0.08 MPa for 15 - 20 min. The wall paint is prepared, further removing the remaining tiny bubbles in the system to ensure that the surface of the wall paint is smooth and free of bubble defects, improving its decorative and protective properties;

[0052] Step 10. Detection: Detect the VOC content, adhesion, and temperature resistance change of the prepared wall paint to ensure that all performance indicators meet environmental protection and usage requirements;

[0053] Step 11. Packaging: The qualified wall paint after detection is filled according to specifications and proper packaging labels are made for subsequent transportation, storage, and sales use.

[0054] The advantages are as follows: The present invention adopts a step-by-step shearing process and a curing and crosslinking treatment, enabling the adhesion of the wall paint to reach level 0, far superior to that of traditional processes. Through the step-by-step shearing and curing and crosslinking processes, the adhesion and durability of the wall paint are improved, enabling it to maintain good adhesion in complex environments (such as temperature and humidity changes), and being not prone to cracking, peeling, or fading, thereby extending the service life of the wall paint.

[0055] Example 1

[0056] Specifically, the raw materials of the wall paint and their weight portions are: 36 parts of composite resin; 13 parts of nano-level filler; 9 parts of auxiliary agent; 7 parts of additive (prepared into wall paint according to the specific raw materials and preparation steps of the present invention).

[0057] Comparative Example 1

[0058] Specifically, the raw materials of the wall paint and their weight portions are: 36 parts of composite resin; 13 parts of nano-level filler; 9 parts of auxiliary agent; 7 parts of additive (replacing the solvent-free resin, ethylene-vinyl acetate copolymer emulsion, waterborne polyurethane dispersion, and organosilicon-modified acrylic emulsion in the composite resin of Example 1 with polyester resin, polyvinyl chloride resin, epoxy resin, and acrylic resin, and keeping the proportion unchanged).

[0059] Example 2

[0060] Specifically, the raw materials of the wall paint and their weight portions are: 30 parts of composite resin; 11 parts of nano-level filler; 6 parts of auxiliary agent; 8 parts of additive.

[0061] Comparative Example 2

[0062] Specifically, the raw materials of the wall paint and their weight portions are: 25 parts of composite resin; 11 parts of nano-level filler; 9 parts of auxiliary agent; 5 parts of additive (replacing nano-titanium dioxide, nano-montmorillonite, and nano-kaolin in the nano-level filler of Example 2 with silicon dioxide, kaolin, and rock powder, and keeping the proportion unchanged).

[0063] Examples 1-2 and Comparative Examples 1-2 were all prepared according to the preparation method of the present invention.

[0064] Example 3 (Raw materials of the paint of the present invention)

[0065] Step 1: Prepare raw materials: 40 parts of composite resin; 12 parts of nano-level filler; 8 parts of auxiliary agent; 9 parts of additive;

[0066] Step 2: Premix the raw materials: Put the composite resin and the nano-level filler into a high-speed dispersion kettle, set the temperature of the dispersion kettle at 28°C, the rotation speed at 1000 r / min, and the stirring duration at 25 min to form a uniform slurry;

[0067] Step 3. Adding auxiliaries: Add auxiliaries in two times. First, add the dispersant and shear at a speed of 1300 r / min for 10 min. Subsequently, add the defoamer and film-forming aid, and reduce the speed to 600 r / min and stir for 15 min;

[0068] Step 4. Adding additives: After adding the defoamer, use the pulse feeding method to alternately add the leveling agent, dryer, ultraviolet absorber and antibacterial agent to form a mixed system, and keep the temperature of the mixed system between 30 °C;

[0069] Step 5. Adjusting viscosity: After adding the thickener, adjust the speed to 300 r / min and stir for 15 min. Use deionized water to adjust the viscosity of the mixed system, reduce the speed to 200 r / min and stir for 20 min to make the viscosity of the mixed system reach 5000 cP, forming a mixed material;

[0070] Step 6. Acid-base balance: Use a pH regulator to adjust the pH of the mixed material to between 9.0, forming a mixed material;

[0071] Step 7. Aging treatment: Transfer the mixed material after acid-base balance to a heat preservation reaction kettle, and stir and age at a speed of 200 r / min for 2.0 h in an environment with a temperature of 45 ± 2 °C;

[0072] Step 8. Filtration: The aged material passes through stainless steel filter meshes of 200 meshes, 400 meshes and 800 meshes in sequence;

[0073] Step 9. Vacuum degassing: Carry out degassing operation under a vacuum condition of -0.08 MPa for 20 min, and the wall paint is prepared;

[0074] Step 10. Detection: Detect the VOC content, adhesion and temperature resistance change of the prepared wall paint;

[0075] Step 11. Packaging: The qualified wall paint after detection is filled according to the specifications and the packaging labels are made.

[0076] Comparative Example 3 (Traditional paint raw materials)

[0077] Step 1. Preparing raw materials: 40 parts of composite resin; 12 parts of nano-level filler; 8 parts of auxiliaries; 9 parts of additives;

[0078] Step 2. Premixing raw materials: Put the composite resin and nano-level filler into the stirring equipment, keep the equipment temperature at room temperature, and stir at a speed of 400 r / min for 35 min to make the materials preliminarily mixed;

[0079] Step 3. Adding auxiliaries: Pour all the auxiliaries into the stirring equipment at one time, increase the speed to 700 r / min, and stir for 20 min without distinguishing the feeding order and stages;

[0080] Step 4. Adding additives: After the additives are added, pour all the leveling agent, drier, ultraviolet absorber, and antibacterial agent into the mixture at once, and stir at a speed of 700 r / min for 20 min.

[0081] Step 5. Adjusting viscosity: After adding the thickener, stir at a speed of 450 r / min for 20 min without strictly controlling the viscosity value of the mixed system.

[0082] Step 6. Acid-base balance: Adjust the pH value of the mixed material.

[0083] Step 7. Aging treatment: Transfer the mixed material to a common reaction kettle and stir at a speed of 120 r / min for 1.5 h at room temperature.

[0084] Step 8. Filtration: The aged material is filtered once through a 400-mesh and 800-mesh filter screen.

[0085] Step 9. Defoaming: Under normal pressure, defoaming is carried out by stirring, and the stirring time is about 30 min.

[0086] Step 10. Detection: Conduct detection items for VOC content, adhesion, and temperature resistance and variability.

[0087] Step 11. Packaging: The qualified wall paint is filled according to the conventional specifications and labeled with conventional packaging labels.

[0088] Example 3 is prepared according to the method of the present invention, while Comparative Example 3 is prepared according to the traditional preparation method.

[0089] The following Table 1 shows the performance test data of the finished wall paint of the examples and comparative examples:

[0090] Table 1

[0091]

[0092]

[0093] The information in Table 1 above shows that:

[0094] Example 3 uses a solvent-free resin system (solvent-free resin + water-based emulsion), and combines pulse feeding and vacuum defoaming (-0.08 MPa). The VOC content is <10 g / L, and formaldehyde and benzene series compounds are not detected, far exceeding the national standard (GB 18582-2020 requires VOC ≤ 80 g / L). Therefore, the example of the present invention has strong environmental protection. In Comparative Example 3, due to the use of the traditional mixing process (one-time feeding, atmospheric defoaming), the solvent residue results in a VOC as high as 75 g / L.

[0095] In Example 1, ethylene-vinyl acetate copolymer (flexibility) + waterborne polyurethane (abrasion resistance) + organosilicon-modified acrylic (weather resistance) are compounded in a ratio of 3:3:3:1 to form a dense and flexible paint film, which increases the adhesion and durability of the wall paint. At the same time, it also has the synergistic effect of composite resins. In Comparative Example 1, traditional resins (such as polyvinyl chloride) have high rigidity and are prone to cracking due to thermal expansion and contraction.

[0096] In Example 2, nano-titanium dioxide (in a ratio of 1:5:5) fills the pores, and the hardness reaches 2H; nano-montmorillonite improves the leveling property and avoids orange peel; nano-kaolin has antibacterial and mildew-proof properties and remains at mildew-proof level 0 in a humid and hot environment. In Comparative Example 2, ordinary fillers (rock powder) result in a loose coating, and the scrub resistance is less than 100 times. Therefore, the addition of the above materials enhances the nano-fillers of the present invention.

[0097] Process comparison is shown in Table 2 below:

[0098] Table 2

[0099]

[0100] The following information is obtained from Table 2:

[0101] In Example 3, through the compounding of an environmentally friendly resin system, nano-fillers, and full-process process control, extreme environmental protection is achieved. Among them, VOC, formaldehyde, and benzene series compounds are not detected, meeting the standards for children's room coatings (such as EN 71-3); and it has super durability. Among them, the scrub resistance is measured to be greater than 500 times (the national standard excellent product requirement is ≥5000 times, and the actual test can reach 8000 times), the temperature change cycle resistance is 20 times without abnormality, the viscosity is stable (5000 cP ± 5%), the open-can state is delicate without sedimentation, and the spreading rate is increased by 15%. In Comparative Example 3, due to double defects in the formula and process, the comprehensive performance is only at the industry average level, verifying the innovation of the technical solution of the present invention.

[0102] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-shedding environmentally friendly wall paint, characterized in that: The wall paint is composed of composite resin, nanometer-level filler, auxiliary agent and additive, and the weight proportion of the raw materials is as follows: 30-40 parts of composite resin; 10-14 parts of nanometer-level filler; 5-10 parts of auxiliary agent; and 7-9 parts of additive.

2. The anti-shedding environmentally friendly wall paint according to claim 1, characterized in that: The composite resin is composed of solvent-free resin, ethylene-vinyl acetate copolymer emulsion, water-based polyurethane dispersion and silicone-modified acrylic emulsion, and the composition ratio is 3:3:3:

1.

3. The anti-shedding environmentally friendly wall paint according to claim 1, characterized in that: The nano-scale filler is composed of nano-titanium dioxide, nano-montmorillonite and nano-kaolin, and the composition ratio thereof is 1:5:

5.

4. The anti-shedding environmentally friendly wall paint according to claim 1, characterized in that: The auxiliary agent is composed of a dispersant, a defoamer, a thickener, a film-forming auxiliary agent and a pH-adjusting agent, and the composition ratio thereof is 3:2:5:1:

1.

5. The anti-shedding environmentally friendly wall paint according to claim 4, characterized in that: The dispersant is selected from polycarboxylate dispersants, the defoamer is selected from polyether defoamers, the thickener is selected from one or two of hydroxyethyl cellulose, xanthan gum or guar gum, the film-forming aid is selected from plant oil-based film-forming aids, and the pH-adjuster is selected from organic amine pH adjusters.

6. The anti-shedding environmentally friendly wall paint according to claim 1, characterized in that: The additives consist of a leveling agent, a drying agent, an ultraviolet absorber and an antibacterial agent, and the composition ratio thereof is 3:4:3:

2.

7. The anti-shedding environmentally friendly wall paint according to claim 6, characterized in that: The leveling agent is selected from one of potassium perfluorobutanesulfonate or fluorine-containing block polyester leveling agent, the drying agent is selected from one of Borchi OXY-Coat series drying agents or water-based composite drying agents, the ultraviolet absorber is selected from one or both of benzotriazole ultraviolet absorbers or triazine ultraviolet absorbers, and the antibacterial agent is selected from one or both of lactic acid, citric acid or silver ion antibacterial agent.

8. A method for preparing an environmentally friendly wall paint that prevents shedding, characterized in that: The method comprises the following preparation steps: Step 1: Prepare raw materials: prepare composite resin, nano-scale filler, auxiliary agent and additive according to the formula weight; Step 2: Premixing of raw materials: Put the composite resin and nano-scale filler into a high-speed dispersion kettle, set the dispersion kettle temperature to 25-35°C, the speed to 800-1200r / min, and the stirring time to 20-30min to form a uniform slurry; Step 3, adding additives: Add additives twice, first add dispersant, shear at a speed of 1200-1500r / min for 10 minutes, then add defoamer and film-forming additives, reduce the speed to 500-600r / min and stir for 15 minutes; Step 4, adding additives: after adding the defoamer, use the pulse feeding method to alternately add the leveling agent, drying agent, ultraviolet absorber and antibacterial agent to form a mixed system, and keep the temperature of the mixed system between 25-35°C; Step 5: Adjust viscosity: After adding the thickener, adjust the speed to 300-400r / min and stir for 15 minutes. Use deionized water to adjust the viscosity of the mixed system. Reduce the speed to 100-200r / min and stir for 20 minutes to make the viscosity of the mixed system reach between 4500-5000cP to form a mixed material. Step 6: Acid-base balance: Use a pH-adjusting agent to adjust the pH of the mixed material to between 8.5 and 9.2 to form a mixed material; Step 7: Ripening treatment: transfer the mixture after acid-base balance into a heat preservation reactor, stir and ripen at a speed of 200-250r / min for 1.5-2.5h at a temperature of 45±2℃; Step 8: Filtration: The cooked material is filtered through 200-mesh, 400-mesh and 800-mesh stainless steel filters in turn; Step 9, vacuum degassing: degassing operation is performed under vacuum conditions of -0.05 to -0.08 MPa for 15-20 minutes, and the wall paint preparation is completed; Step 10: Testing: Test the VOC content, adhesion and temperature resistance of the prepared wall paint; Step 11: Repackaging: The wall paint that has passed the inspection is filled according to the specifications and the packaging is labeled.

9. The method for preparing an anti-shedding environmentally friendly wall paint according to claim 8, characterized in that: The raw materials of the wall paint and their weight parts are: 36 parts of composite resin; 13 parts of nano-grade filler; 9 parts of auxiliary agent; and 7 parts of additive.

10. The method for preparing an anti-shedding environmentally friendly wall paint according to claim 8, characterized in that: The raw materials of the wall paint and their weight parts are: 30 parts of composite resin; 11 parts of nano-grade filler; 6 parts of auxiliary agent; and 8 parts of additive.

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