Interior wall latex paint and preparation method thereof

Abstract

The invention discloses interior wall latex paint and a preparation method thereof, and belongs to the technical field of water-based paint. Comprising 360-410 parts of deionized water, 3-7 parts of cellulose, 3-8 parts of a dispersing agent, 1-4 parts of a wetting agent, 1-5 parts of a defoaming agent, 1-5 parts of a pH regulator, 10-30 parts of rutile titanium dioxide, 100-250 parts of kaolin, 350-400 parts of coarse whiting, 15-30 parts of rheological suspension additive gel, 50-100 parts of an emulsion, 5-10 parts of a coalescing agent, 1-5 parts of a preservative and 8-25 parts of a freeze-thaw resistant stabilizer, and the VOC content in the coating is effectively reduced through the coalescing agent; the freeze-thaw-resistant stabilizer is introduced, so that the freeze-thaw stability of the coating is improved; by optimizing the formula, the scrubbing resistance of the coating is improved; meanwhile, the novel formula effectively inhibits growth of bacteria and mould, especially in a humid environment, the wall surface can be effectively prevented from mildewing and discoloring, and the service life of the coating is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based coatings, and in particular relates to a low-VOC, highly scrub-resistant, and odor-free interior wall latex paint and a preparation method thereof. Background Art

[0002] As consumers pay more and more attention to environmental protection and indoor air quality, the demand for low-VOC products in the interior latex paint market is growing. Although there are many interior latex paint products on the market, most products still have deficiencies in environmental performance, cost-effectiveness, scrub resistance, and antibacterial and mildew resistance.

[0003] At present, although the industry has controlled the VOC content to some extent, there are still many products with high VOC content, which do not meet the increasingly stringent environmental protection standards and consumer health requirements. Some interior wall latex paint products have high costs due to raw materials and production processes, which limits their promotion and application in a wider market. At the same time, the scrub resistance of existing interior wall latex paints still needs to be improved. Scrub resistance is an important technical indicator of interior wall latex paints, and its quality is directly related to the latex paint's bonding ability, pollution resistance, durability and many other properties.

[0004] In addition, antibacterial and mildew-proof properties are also issues that interior wall latex paints need to focus on. In a humid environment, the wall surface is prone to breeding bacteria and mildew, which affects the indoor air quality and reduces the decorativeness and service life of the paint film. Although the antibacterial and mildew-proof interior wall latex paints currently on the market have certain effects, there is still room for improvement.

[0005] In summary, developing an interior wall latex paint with lower VOC content, lower cost, better scrub resistance and antibacterial and mildew resistance has important practical significance and broad market prospects for meeting market demand and improving the quality of living environment. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the above problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the object of the present invention is to overcome the deficiencies in the prior art and provide an interior wall latex paint and a preparation method thereof.

[0009] In order to solve the above technical problems, the present invention provides the following technical solution: based on the mass fraction of the interior wall latex paint raw materials, the following comprises:

[0010] 360-410 parts of deionized water, 3-7 parts of cellulose, 3-8 parts of dispersant, 1-4 parts of wetting agent, 1-5 parts of defoaming agent, 1-5 parts of pH regulator, 10-30 parts of rutile titanium dioxide, 100-250 parts of kaolin, 350-400 parts of heavy calcium, 10-30 parts of rheological suspension aid gel, 50-100 parts of emulsion, 5-10 parts of film-forming aid, 1-5 parts of preservative and 8-25 parts of antifreeze-thaw stabilizer.

[0011] As a preferred embodiment of the interior wall latex paint of the present invention, the film-forming aid is composed of film-forming aid 1 and film-forming aid 2, wherein the film-forming aid 1 is dipropylene glycol butyl ether, and the film-forming aid 2 is dipropylene glycol methyl ether.

[0012] As a preferred embodiment of the interior wall latex paint of the present invention, the cellulose is selected from one or more of hydroxyethyl cellulose, hydroxypropyl cellulose and methyl cellulose.

[0013] As a preferred embodiment of the interior wall latex paint of the present invention, the dispersant is selected from one or more of modified styrene maleic anhydride copolymer solution, modified poly, and hydrophobic group modified carboxylic acid copolymer.

[0014] As a preferred embodiment of the interior wall latex paint of the present invention, the film-forming aid is one or more of dipropylene glycol butyl ether, dipropylene glycol methyl ether and hexadecanol ester.

[0015] As a preferred solution of the interior wall latex paint of the present invention, the rheological suspension aid gel is a sodium bentonite gel, and is processed and prepared by the following method: under a standard environment, deionized water is placed in a dispersion tank, sodium bentonite is slowly added at a speed of 400 to 500 r / min, and the speed is increased to 1500 to 2000 r / min, and high-speed dispersion is performed for 30 to 40 minutes to obtain a sodium bentonite gel with a mass fraction of 4 to 5%.

[0016] As a preferred embodiment of the interior wall latex paint of the present invention, the antifreeze-thaw stabilizer is one or more of sodium dodecylbenzene sulfonate and alkyl glycoside.

[0017] As a preferred embodiment of the interior wall latex paint of the present invention, the defoamer is one or more of mineral oil, silicone, and polyether defoamer.

[0018] Another object of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing an interior wall latex paint.

[0019] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0020] Deionized water, cellulose, an antifreeze-thaw stabilizer, a wetting agent, a defoaming agent and a dispersant are sequentially added at a speed of 300 to 500 r / min, and dispersed for 5 to 8 minutes to obtain a first component slurry;

[0021] Then, a pH regulator, rutile titanium dioxide, kaolin and heavy calcium are added in sequence, and the rotation speed is increased to 1200-1500 r / min, and high-speed dispersion is continued for 20-30 minutes, and then the rotation speed is reduced to 800-1000 r / min, and a rheological suspension aid gel, an emulsion, a film-forming aid, a preservative and a defoaming agent are added in sequence, and the mixture is stirred for 5-10 minutes, cooled to room temperature, and filtered to obtain the interior wall latex paint.

[0022] As a preferred embodiment of the method for preparing interior wall latex paint of the present invention, when preparing the first component slurry, the amount of defoamer added is 50% of the total amount, and the defoamer added after reducing the rotation speed is the remaining 50% of the total amount added.

[0023] As a preferred embodiment of the interior wall latex paint of the present invention, the interior wall latex paint is used to protect the wall surface from scrubbing, bacteria and mildew.

[0024] The beneficial effects of the present invention are as follows: the VOC content in the coating is effectively reduced by the film-forming aid; the freeze-thaw stability of the coating is improved by introducing the anti-freeze-thaw stabilizer; the scrub resistance of the coating is improved by optimizing the formula; at the same time, the new inventive formula effectively inhibits the growth of bacteria and mold, especially in a humid environment, and can effectively prevent the wall from mold and discoloration, thereby extending the service life of the coating.

[0025] In summary, the present invention not only reduces the VOC content and cost, but also significantly improves the scrub resistance and antibacterial and mildew resistance by selecting more suitable film-forming aids and antifreeze-thaw stabilizers, and has important market application value and broad development prospects. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] The following examples of the present invention use raw materials as follows:

[0030] The cellulose is HE-30ME from Shandong Heda;

[0031] The antifreeze-thaw stabilizer is sodium dodecylbenzene sulfonate from Jiangsu Haian Petrochemical;

[0032] The dispersant is Beiyihua's 5029;

[0033] The wetting agent is G-003 from Anhui Guangcheng New Materials;

[0034] The defoamer was SPA-202 from Yantai Addition Chemical;

[0035] The pH regulator is AMP-95 from Hangzhou Milocool;

[0036] The titanium dioxide is SR-2377 from Shandong Dongjia Group;

[0037] Kaolin was SX-80A from Inner Mongolia Sanxin, with a particle size of 4000 mesh;

[0038] The manufacturer of heavy calcium powder is Anhui Yongteng Powder, and the particle size is 800 mesh;

[0039] The rheological suspension additive was YH-ED from Zhejiang Yuhong New Materials Co., Ltd.;

[0040] The emulsion is BASF's 7080;

[0041] The film-forming aid is Runtai's RTC-295;

[0042] The preservative is KS-2.5 from Shanghai Pengtu Antibacterial New Materials.

[0043] The rheological suspension aid gel is prepared by the following method:

[0044] At a temperature of 23°C, 4 kg of rheological suspension aid was slowly added into 96 kg of deionized water at 400-500 r / min, and then the speed of the disperser was increased to 1500-2000 r / min. The mixture was dispersed at high speed for 30-40 minutes for full and uniform emulsification, and filtered to obtain a rheological suspension aid gel with a mass fraction of 4%.

[0045] Example 1

[0046] This embodiment provides a method for preparing interior wall latex paint, specifically:

[0047] Weigh the raw materials according to the following formula:

[0048] 380 parts of deionized water, 5 parts of cellulose (hydroxyethyl), 5 parts of dispersant (hydrophobic modified carboxylic acid copolymer), 1 part of wetting agent, 2 parts of defoaming agent (mineral oil), 10 parts of rutile titanium dioxide, 50 parts of emulsion (styrene acrylic emulsion), 8 parts of film-forming aid (hexadecyl alcohol ester), 1 part of pH regulator, 150 parts of kaolin (4000 mesh), 375 parts of heavy calcium (800 mesh heavy calcium carbonate), 20 parts of rheological suspension aid gel, 2 parts of preservatives and 8 parts of anti-freeze-thaw stabilizer (sodium dodecylbenzene sulfonate).

[0049] Deionized water, cellulose, an antifreeze-thaw stabilizer, a wetting agent, 50% of the total amount of a defoaming agent, and a dispersant were sequentially added at a speed of 500 r / min, and dispersed for 5 minutes to obtain a first component slurry;

[0050] Then add pH regulator, rutile titanium dioxide, kaolin and heavy calcium in turn, increase the speed to 1500r / min, continue high-speed dispersion for 20 minutes, then reduce the speed to 800r / min, add the remaining 50% of the total amount of rheological suspension aid gel, emulsion, film-forming aid, preservative and defoaming agent in turn, stir for 10 minutes, cool to room temperature, filter, and obtain interior wall latex paint.

[0051] Example 2

[0052] The coating formula of the present embodiment is as follows:

[0053] Weigh the raw materials according to the following formula:

[0054] 380 parts of deionized water, 5 parts of cellulose (hydroxyethyl), 5 parts of dispersant (hydrophobic modified carboxylic acid copolymer), 1 part of wetting agent, 2 parts of defoaming agent (mineral oil), 13 parts of rutile titanium dioxide, 60 parts of emulsion (styrene acrylic emulsion), 8 parts of film-forming aid (hexadecyl alcohol ester), 1 part of pH regulator, 100 parts of kaolin (4000 mesh), 380 parts of heavy calcium (800 mesh heavy calcium carbonate), 15 parts of rheological suspension aid gel, 2 parts of preservatives and 13 parts of anti-freeze-thaw stabilizer (sodium dodecylbenzene sulfonate).

[0055] Deionized water, cellulose, an antifreeze-thaw stabilizer, a wetting agent, 50% of the total amount of a defoaming agent, and a dispersant were sequentially added at a speed of 500 r / min, and dispersed for 5 minutes to obtain a first component slurry;

[0056] Then add pH regulator, rutile titanium dioxide, kaolin and heavy calcium in turn, increase the speed to 1500r / min, continue high-speed dispersion for 20 minutes, then reduce the speed to 800r / min, add the remaining 50% of the total amount of rheological suspension aid gel, emulsion, film-forming aid, preservative and defoaming agent in turn, stir for 10 minutes, cool to room temperature, filter, and obtain interior wall latex paint.

[0057] Example 3

[0058] The coating formula of the present embodiment is as follows:

[0059] Weigh the raw materials according to the following formula:

[0060] 360 parts of deionized water, 5 parts of cellulose (hydroxyethyl), 5 parts of dispersant (hydrophobic modified carboxylic acid copolymer), 1 part of wetting agent, 2 parts of defoaming agent (mineral oil), 13 parts of rutile titanium dioxide, 50 parts of emulsion (styrene acrylic emulsion), 5 parts of film-forming aid (hexadecyl alcohol ester), 1 part of pH regulator, 150 parts of kaolin (4000 mesh), 400 parts of heavy calcium (800 mesh heavy calcium carbonate), 20 parts of rheological suspension aid gel, 2 parts of preservatives and 15 parts of anti-freeze-thaw stabilizer (sodium dodecylbenzene sulfonate).

[0061] Deionized water, cellulose, an antifreeze-thaw stabilizer, a wetting agent, 50% of the total amount of a defoaming agent, and a dispersant were sequentially added at a speed of 500 r / min, and dispersed for 5 minutes to obtain a first component slurry;

[0062] Then add pH regulator, rutile titanium dioxide, kaolin and heavy calcium in turn, increase the speed to 1500r / min, continue high-speed dispersion for 20 minutes, then reduce the speed to 800r / min, add the remaining 50% of the total amount of rheological suspension aid gel, emulsion, film-forming aid, preservative and defoaming agent in turn, stir for 10 minutes, cool to room temperature, filter, and obtain interior wall latex paint.

[0063] The interior wall latex paints prepared in Examples 1 to 3 were tested for viscosity, hiding power, alkali resistance, scrub resistance, odor, VOC content, freeze-thaw resistance, storage stability and other properties according to relevant standards. The test results are shown in Table 1.

[0064] Table 1 is a comparison of the performance test results of interior wall latex paints in different embodiments:

[0065] Table 1 Performance test of interior wall latex paint obtained in Examples 1 to 3

[0066]

[0067] It can be seen from Table 1 that the interior wall latex paints prepared in Examples 1-3 of the present invention have good scrub resistance, freeze-thaw stability, storage stability and other properties, and all indicators meet the requirements of GB / T 9756-2018 "Synthetic Resin Emulsion Interior Wall Paint". At the same time, they have a low VOC content, meet the requirements of VOC limit in GB 18582-2020 "Limits of Hazardous Substances in Building Wall Paints", and have no odor when opening the can, and have excellent storage stability.

[0068] In the formula of the present invention, hexadecanol ester with a boiling point of 295°C is selected as a film-forming aid. Specifically, due to its high boiling point, less VOC is volatilized during the film-forming process, thereby significantly reducing the impact on indoor air quality. At the same time, its high boiling point characteristic makes the solvent evaporate more slowly during the film-forming process, so that the coating film can be formed more evenly, reducing the defects and unevenness of the coating film. This not only improves the appearance quality of the coating film, but also enhances the mechanical strength and durability of the coating film;

[0069] Furthermore, hexadecanol ester itself has certain antibacterial properties and can effectively inhibit the growth of bacteria and mold. In addition, its high boiling point and good film-forming properties also help to form a denser coating film, reduce the penetration of moisture and microorganisms, and further enhance the antibacterial and anti-mildew effect after latex paint construction;

[0070] Hexadecyl alcohol ester has good compatibility with styrene acrylic emulsion, which reduces the demulsification phenomenon caused by compatibility problems and improves the stability and reliability of the coating.

[0071] At the same time, the present invention uses sodium dodecylbenzene sulfonate as an anti-freeze-thaw stabilizer, which works synergistically with hexadecyl alcohol ester to further improve the freeze-thaw stability of the coating. Sodium dodecylbenzene sulfonate and alkyl polyglycoside serve as surfactants, which can effectively disperse particles in the emulsion and enhance the stability of the emulsion, while reducing the formation of ice crystals and preventing emulsion demulsification and stratification during the freeze-thaw process.

[0072] In summary, the selection of hexadecanol ester with a boiling point of 295°C as a film-forming aid for interior wall latex paint and the introduction of sodium dodecylbenzene sulfonate as an anti-freeze-thaw stabilizer not only significantly improve the environmental performance, film-forming effect, scrub resistance and antibacterial and mildew resistance of the coating, but also further improve the stability and economic benefits of the coating through synergistic effects with other ingredients.

[0073] Comparative Example 1

[0074] The difference between this comparative example and Example 1 is that the antifreeze-thaw stabilizer is replaced by an antifreeze agent of "ethylene glycol", and the remaining steps and processes are all referred to Example 1, to obtain the interior wall latex paint prepared under different antifreeze conditions in this comparative example, and measure the relevant properties, and compare with Example 1, and the results are shown in Table 2.

[0075] Table 2 Interior wall latex paint obtained in Comparative Example 1

[0076]

[0077] As can be seen from Table 2, after the anti-freeze-thaw stabilizer was replaced with ethylene glycol, many properties of interior wall latex paint declined, mainly manifested in washability, VOC content and freeze-thaw stability.

[0078] Specifically, sodium dodecylbenzene sulfonate is an anionic surfactant whose molecular structure includes a hydrophobic group (dodecylphenyl) and a hydrophilic group (sulfonic acid group). This structure gives it good surface activity and can effectively reduce the tension of the oil-water interface to achieve the effects of emulsification and dispersion. It is easily soluble in water and stable under alkaline conditions. These characteristics enable it to evenly disperse the particles in the emulsion in interior wall latex paint and enhance the stability of the emulsion.

[0079] Ethylene glycol has a low freezing point and is often used in antifreeze. However, ethylene glycol itself is not a surfactant and does not have emulsification and dispersion functions. In interior wall latex paint, although ethylene glycol can lower the freezing point, it cannot effectively disperse the particles in the emulsion, which can easily lead to emulsion demulsification and stratification during the freeze-thaw process.

[0080] Furthermore, sodium dodecylbenzene sulfonate itself has certain antibacterial properties and can effectively inhibit the growth of bacteria and molds. When used in combination with hexadecanol ester, the antibacterial and antifungal effects of the coating are further enhanced.

[0081] However, when ethylene glycol is used in combination with hexadecyl alcohol ester, although it can lower the freezing point, it cannot effectively disperse the particles in the emulsion, which can easily lead to emulsion demulsification and stratification during the freeze-thaw process. Ethylene glycol cannot form a dense coating film, which may allow water molecules to penetrate the coating film, resulting in the inability to effectively inhibit the growth of bacteria and mold.

[0082] Comparative Example 2

[0083] The difference between this comparative example and Example 1 is that no antifreeze-thaw stabilizer is added, and the remaining steps and processes are all referred to Example 1 to obtain the interior wall latex paint of this comparative example, and the relevant properties are measured and compared with Example 1. The results are shown in Table 3.

[0084] Table 3 Interior wall latex paint obtained in Comparative Example 2

[0085]

[0086] It can be seen from Table 3 that without adding sodium dodecylbenzene sulfonate, the antibacterial and anti-mildew properties and freeze-thaw stability of interior wall latex paint are poor.

[0087] Comparative Example 3

[0088] The difference between this comparative example and Example 1 is that the type of film-forming aid is adjusted to "2,2,4-trimethyl-1,3-pentanediol diisobutyrate", and the remaining steps and processes are all referred to Example 1, to obtain the interior wall latex paint prepared under different film-forming conditions of this comparative example, and measure the relevant properties, and compare with Example 1. The results are shown in Table 4.

[0089] Table 4 Interior wall latex paint obtained in Comparative Example 3

[0090]

[0091]

[0092] As can be seen from Table 4, the scrub resistance, VOC content, and mildew resistance of the interior wall latex paint in Comparative Example 1 have all declined. This is because hexadecyl alcohol ester is a new type of special plasticizer and viscosity reducer that is environmentally friendly, efficient, and non-toxic and does not contain a benzene ring. Its alias is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate. Its high boiling point characteristic (boiling point 295°C) makes the VOCs that volatilize less during the film-forming process, thereby significantly reducing the impact on indoor air quality, which meets the country's increasingly stringent environmental protection standards.

[0093] Although 2,2,4-trimethyl-1,3-pentanediol diisobutyrate is also an environmentally friendly film-forming aid, its boiling point is relatively low (boiling point 278°C), and the amount of VOC volatilized during the film-forming process is relatively large, which does not meet the current strict requirements for low-VOC coatings.

[0094] Furthermore, the high boiling point of hexadecanol ester makes it evaporate more slowly during the film-forming process, which enables a more uniform film formation, reduces defects and unevenness of the film, and improves the mechanical strength and durability of the film. In addition, hexadecanol ester has low solubility in water and has a certain volatility. It can be retained in the film during the film-forming process and fully evaporate after the film is formed, without affecting the film performance.

[0095] The coating formed by hexadecyl alcohol ester has higher hardness and better scrub resistance after drying, which significantly extends the service life of the coating. Its high boiling point makes the coating more uniform during the drying process, reduces the defects of the coating, and thus improves the scrub resistance.

[0096] Comparative Example 4

[0097] The difference between this comparative example and Example 1 is that the type of film-forming aid is adjusted to "dodecyl alcohol ester", and the remaining steps and processes are all referred to Example 1, to obtain the interior wall latex paint prepared under different film-forming conditions of this comparative example, and measure the relevant properties, and compare with Example 1. The results are shown in Table 5.

[0098] Table 5 Interior wall latex paint obtained in Comparative Example 4

[0099]

[0100]

[0101] As can be seen from Table 4, the interior wall latex paint of Comparative Example 4 has declined in scrub resistance, VOC content, mildew resistance, etc., and the odor is significantly larger in the olfactory test. This is because the boiling point of dodecyl alcohol ester is relatively low (about 280°C), and the volatilization rate is relatively fast during the film formation process, which may lead to increased defects and unevenness of the coating, affecting the mechanical strength and durability of the coating. At the same time, the coating formed by dodecyl alcohol ester has a low hardness after drying and poor scrub resistance. It is easily damaged by friction, affecting the service life of the coating. Although dodecyl alcohol ester can improve the gloss and leveling of the paint film, it is not as good as hexadecanol ester in terms of scrub resistance.

[0102] Comparative Example 5

[0103] The difference between this comparative example and Example 1 is that the amount of film-forming aid added is reduced to 3 parts, and the rest of the formula and preparation process are the same as those of Example 1. The interior wall latex paint prepared in Comparative Example 5 was subjected to various performance tests, and the comparison results with Example 1 are shown in the figure.

[0104] Table 6 Interior wall latex paint obtained in Comparative Example 5

[0105]

[0106] It can be seen from Table 5 that when the amount of film-forming aid added is reduced, although the VOC emission is slightly reduced, the scrubbing resistance, antibacterial and mildew resistance of the interior wall latex paint are reduced. After the amount of addition is reduced, the additional free volume provided by the film-forming aid in the film-forming process is reduced, and the diffusion and fusion of the polymer molecular chains are restricted, resulting in reduced hardness of the coating, insufficient density and hardness of the coating, and the coating is easily damaged during scrubbing. Moisture and microorganisms are more easily penetrated, which may lead to weakened antibacterial and mildew resistance of the coating after construction.

[0107] Comparative Example 6

[0108] The difference between this comparative example and Example 1 is that the cellulose manufacturer is adjusted to HD-30000 of Luzhou North, and the remaining steps and processes are all referred to Example 1, so as to obtain the interior wall latex paint prepared under the conditions of cellulose from different manufacturers in this comparative example, measure the relevant properties, and compare with Example 1.

[0109] The interior wall latex paint prepared in Comparative Example 1 was subjected to various performance tests, and the comparison results with those of Example 1 are shown in Table 7.

[0110] Table 7 Interior wall latex paint obtained in Example 6

[0111]

[0112] It can be seen from Table 7 that after replacing the cellulose manufacturer, the viscosity and antibacterial and mildew-proof properties of the interior wall latex paint decreased.

[0113] Shandong Heda's HE-30ME cellulose adopts an advanced "one-step" new process to produce products with higher purity and more stable performance. This enables it to better maintain the uniformity and stability of the coating when used in interior wall latex paint, and reduce coating defects caused by fluctuations in cellulose properties.

[0114] The production process of HE-30ME cellulose is more environmentally friendly, and the content of harmful substances in the product is lower, which meets modern environmental protection requirements. This not only helps to reduce VOC emissions, but also improves the overall environmental performance of the coating and meets increasingly stringent environmental standards.

[0115] HE-30ME cellulose has a wider compatibility and can work synergistically with a variety of additives to improve the comprehensive performance of coatings. For example, it can work synergistically with film-forming aids, antifreeze-thaw stabilizers, etc. to significantly improve the scrub resistance and antibacterial and anti-mildew properties of coatings.

[0116] Comparative Example 7

[0117] The difference between this comparative example and Example 1 is that the manufacturer of the dispersant is Nouryon's 747, and the remaining steps and processes are all referred to Example 1, so as to obtain the interior wall latex paint prepared under the conditions of dispersants from different manufacturers in this comparative example.

[0118] The interior wall latex paint prepared in Comparative Example 7 was subjected to various performance tests, and the comparison results with those of Example 1 are shown in Table 8.

[0119] Table 8 Interior wall latex paint obtained in Comparative Example 7

[0120]

[0121] It can be seen from Table 8 that the dispersant selected in the formula of the present invention provides better water resistance and scrub resistance. After replacing it with the dispersant of Nouryon, many properties of the interior wall latex paint declined.

[0122] In summary, the interior wall latex paint prepared by the technical solution of the present invention has good scrub resistance and lower VOC content, and has good efficiency while maintaining good performance by selecting a suitable film-forming aid.

[0123] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An interior wall latex paint, characterized in that: Calculated by weight of the interior wall latex paint raw materials, including: 360-410 parts of deionized water, 3-7 parts of cellulose, 3-8 parts of dispersant, 1-4 parts of wetting agent, 1-5 parts of defoaming agent, 1-5 parts of pH regulator, 10-30 parts of rutile titanium dioxide, 100-250 parts of kaolin, 350-400 parts of heavy calcium, 15-30 parts of rheological suspension aid gel, 50-100 parts of emulsion, 5-10 parts of film-forming aid, 1-5 parts of preservative and 8-25 parts of antifreeze-thaw stabilizer.

2. The interior wall latex paint according to claim 1, characterized in that: The cellulose is selected from one or more of hydroxyethyl cellulose, hydroxypropyl cellulose and methyl cellulose.

3. The interior wall latex paint according to claim 2, characterized in that: The dispersant is selected from one or more of modified styrene maleic anhydride copolymer solution, modified polyether, and hydrophobic group modified carboxylic acid copolymer.

4. The interior wall latex paint according to claim 1, characterized in that: The film-forming aid is one or more of dipropylene glycol butyl ether, dipropylene glycol methyl ether and hexadecanol ester.

5. The interior wall latex paint according to claim 1, characterized in that: The rheological suspension aid gel is a sodium bentonite gel, and is processed and prepared by the following method: under a standard environment, deionized water is placed in a dispersion tank, sodium bentonite is slowly added at a speed of 400 to 500 r / min, and the speed is increased to 1500 to 2000 r / min, and high-speed dispersion is performed for 30 to 40 minutes to obtain a sodium bentonite gel with a mass fraction of 4 to 5%.

6. The interior wall latex paint according to claim 1, characterized in that: The antifreeze-thaw stabilizer is one or more of sodium dodecylbenzene sulfonate, alkyl glycoside, and fatty alcohol polyoxyethylene ether.

7. The interior wall latex paint according to claim 1, characterized in that: The defoaming agent is one or more of mineral oil, silicone, and polyether defoaming agent.

8. The method for preparing the interior wall latex paint as claimed in any one of claims 1 to 7, characterized in that: include, Deionized water, cellulose, an antifreeze-thaw stabilizer, a wetting agent, a defoaming agent and a dispersant are sequentially added at a speed of 300 to 500 r / min, and dispersed for 5 to 8 minutes to obtain a first component slurry; Then, a pH regulator, rutile titanium dioxide, kaolin and heavy calcium are added in sequence, and the rotation speed is increased to 1200-1500 r / min, and high-speed dispersion is continued for 20-30 minutes, and then the rotation speed is reduced to 800-1000 r / min, and a rheological suspension aid gel, an emulsion, a film-forming aid, a preservative and a defoaming agent are added in sequence, and the mixture is stirred for 5-10 minutes, cooled to room temperature, and filtered to obtain the interior wall latex paint.

9. The interior wall latex paint according to claim 8, characterized in that: When preparing the first component slurry, the amount of defoamer added is 50% of the total amount, and the amount of defoamer added after reducing the rotation speed is the remaining 50% of the total amount added.

10. Use of the interior wall latex paint according to any one of claims 1 to 7 in protecting wall surfaces from scrubbing, bacteria and mildew.

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