Emulsion paint with high scrubbing resistance and low VOC (volatile organic compound) and preparation method thereof

Abstract

The invention discloses latex paint with high scrubbing resistance and low VOC (volatile organic compounds) and a preparation method of the latex paint. The emulsion paint is prepared from the following components in parts by weight: 0.05 to 0.1 part of 30,000 cellulose, 0.1 to 0.15 part of pH regulator, 0.2 to 0.5 part of wetting agent, 0.4 to 0.5 part of ammonium salt dispersing agent, 0.4 to 0.5 part of sodium salt dispersing agent, 0.6 to 0.7 part of defoaming agent, 22 to 26.5 parts of rutile titanium dioxide, 7 to 13 parts of superfine coarse whiting, 1 to 2 parts of superfine matting powder, 40 to 45 parts of film-forming emulsion, 2 to 5 parts of covering polymer emulsion, 0.3 to 0.4 part of bactericide, 0.5 to 2 parts of anti-formaldehyde aid, 0.3 to 0.4 part of mildew preventive and 1 part of flatting agent. 1.5 parts of the raw materials and 12 to 13.9 parts of deionized water. According to the invention, VOC and harmful substance release sources are eliminated from the source, so that the VOC content of the latex paint is greatly reduced and can be as low as 0.022 mg / m < 3 >; and meanwhile, the paint film formed by the invention also has excellent scrubbing resistance (the paint film is still kept complete after more than or equal to 30000 times).

Description

Technical Field

[0001] This invention relates to a low-VOC latex paint, and also to a method for preparing the aforementioned latex paint. Background Technology

[0002] In the production process of traditional latex paint, various additives are typically added to ensure the integrity, leveling, and scrub resistance of the paint film, such as film-forming aids, dispersants, thickeners, and preservatives. Among these additives, traditional film-forming aids, especially those represented by dodecyl alcohol esters, and some solvent-based additives, are the main sources of volatile organic compounds (VOCs) in coatings. VOCs continue to be released for a long time after application, not only causing unpleasant indoor odors but also potentially triggering headaches, respiratory irritation, and even posing potential harm to the nervous system and children's development.

[0003] Most of the "environmentally friendly paints" or "children's paints" currently on the market cater to the market by reducing the content of some harmful substances or using low-odor fragrances. However, they have the following problems during use: it is difficult to achieve both low VOC and high performance. In order to achieve extremely low VOC, it is often necessary to significantly reduce or replace key additives, which will directly lead to a decline in paint film performance, manifested as low scrub resistance, loose paint film, easy chalking, and weak stain resistance. They cannot meet the rigid needs of families with infants and young children for frequent wall cleaning and anti-graffiti. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a latex paint that can simultaneously achieve low VOC and high performance, by eliminating VOC and harmful substance release sources at the source, reducing VOC to as low as 0.022 mg / m³. 3 The resulting paint film exhibits excellent scrub resistance (remaining intact after ≥30,000 scrubs); another objective of this invention is to provide a method for preparing the aforementioned latex paint.

[0005] Technical Solution: The latex paint of the present invention is composed of the following components in parts by weight: 0.05-0.1 parts of 30,000 cellulose, 0.1-0.15 parts of pH adjuster, 0.2-0.5 parts of wetting agent, 0.4-0.5 parts of ammonium salt dispersant, 0.4-0.5 parts of sodium salt dispersant, 0.6-0.7 parts of defoamer, 22-26.5 parts of rutile titanium dioxide, 7-13 parts of ultrafine heavy calcium carbonate, 1-2 parts of ultrafine matting agent, 40-45 parts of film-forming emulsion, 2-5 parts of covering polymer emulsion, 0.3-0.4 parts of bactericide, 0.5-2 parts of formaldehyde-resistant additive, 0.3-0.4 parts of mildew inhibitor, 1-1.5 parts of leveling agent, and 12-13.9 parts of deionized water.

[0006] The 30,000 cellulose molecules are hydroxyethyl cellulose 250HBR, a nonionic cellulose derivative of the NATROSOL® 250 series. The wetting agent is Sasol C12-C14 fatty alcohol polyoxyethylene ether. The pH adjuster is an alkaline pH adjuster used to adjust the pH of the slurry to an alkaline environment (10-12), which also facilitates the optimal effect of the subsequent anionic dispersant. The ammonium salt dispersant is BASF 1168, which, through its ionized groups, causes pigment particles to carry the same charge and repel each other, achieving long-term stable dispersion of the pigment and preventing coarsening. It is also combined with the sodium salt dispersant to form a three-dimensionally stable dispersion system, ensuring storage stability under high powder content. The sodium salt dispersant is BASF PA25, which provides steric hindrance dispersion; its polymer chains adsorb onto the pigment surface, forming a physical barrier to prevent particles from agglomerating. The defoamer is a polyether siloxane copolymer emulsion (commercial model: DIG825), added to the system in two stages: a portion is added during the grinding stage to eliminate air bubbles introduced by stirring, and the remaining portion is added during the paint mixing stage to eliminate air bubbles introduced by the emulsion and additives. The rutile titanium dioxide is Baililian BLR-996 rutile titanium dioxide with an average particle size of 0.2~0.3μm. The ultrafine heavy calcium carbonate is used to increase film thickness and sandability, and to adjust PVC. The selection of ultrafine, low-oil-absorption products reduces emulsion absorption, which is beneficial for improving the high scrub resistance of the film. The ultrafine matting agent is ACEMATT® OK263 silica matting agent with a specific surface area of ​​170±30m². 2 / g, with an average particle size of 10-12nm. The film-forming emulsion is a maternal and infant grade film-forming emulsion, specifically Dow Chemical 985, a pure acrylate copolymer emulsion with an average particle size of 20-40nm. The covering polymer emulsion is Dow UCAR E (UCAR). TM E-series emulsion; the bactericide is Ruiloco GY88; the formaldehyde-resistant additive is purchased from Guangdong Meitus Building Materials Co., Ltd., product model: Kefu KF26, which is a solid white powder that can remove formaldehyde and harmful substances through physical adsorption and release of hydroxyl free radicals; the mildew inhibitor is preferably Ruiloco GY77, and the leveling agent is preferably Dow Chemical 620.

[0007] All emulsions and additives in the latex paint of this invention are certified by FDA 21 CFR 175.300, and all selected ingredients meet food-grade requirements.

[0008] The method for preparing the latex paint of the present invention specifically includes the following steps: (1) First, divide the components in the formula into components A, B, C and D; among them, component A is: 30,000 cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and part of defoamer and part of deionized water in the formula amount; component B is: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting powder and part of deionized water in the formula amount; component C is: film-forming emulsion and covering polymer emulsion in the formula amount; component D is: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer and remaining deionized water in the formula amount; (2) Add the water from material A into a clean dispersion tank, start the stirring and stir at 600 r / min; while stirring, add the remaining material from material A into the dispersion tank and continue stirring for 5~10 min; (3) Increase the dispersion speed to 1000 r / min and continue stirring for 10~20 min; then put material B into the dispersion tank and continuously adjust the height of the dispersion disc (from 1 / 6 of the blade diameter (D) to 1 / 4) to ensure that material B can easily enter the slurry. Wash the edge after feeding. (4) Continue to disperse at a speed of 1000 r / min for 20~30 min, and send it for fineness testing. If the fineness test is qualified (≤50µm), transfer it into the paint mixing tank. If the fineness test is not qualified, handle it according to the non-conforming product control procedure. (5) Add material C to the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersing plate until the slurry tumbles obviously, and stir at low speed for 5~10 min; (6) Add material D to the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersing plate until the slurry tumbles obviously, stir at low speed for 15~20 min, and release the bottom valve once; (7) Submit for inspection. After passing the inspection, filter and package the white paint to obtain the finished product. If color matching is required, match the color according to the color matching requirements. After the color matching is completed, submit for inspection. After passing the inspection, filter and package the finished product to obtain the finished product. If the inspection fails, handle it according to the non-conforming product control procedure.

[0009] In step (1), the amount of defoamer added to material A is 42-50% of the total amount of defoamer; the amount of deionized water added to material A is 85-86.5% of the total amount of deionized water; and the amount of deionized water added to material B is 7-8% of the total amount of deionized water.

[0010] The formulation of this invention has a high film-forming emulsion content (above 40%). After the water evaporates, the high content emulsion forms a continuous and tough polymer film (continuous polymer phase), which is the "skeleton" of the paint film, providing elasticity, adhesion and strength. The volume of the polymer in the formulation is much larger than the volume of the voids left after the pigments are piled up. Therefore, each pigment particle is completely wrapped by sufficient polymer, thereby achieving a structural guarantee of high scrub resistance and crack resistance. At the same time, the high hardness and stable rutile titanium dioxide crystal structure is dispersed in the polymer film, which further enhances the wear resistance. Ultrafine heavy calcium carbonate fills the voids, optimizes the packing density, reduces shrinkage stress, and makes the formed paint film denser.

[0011] Rutile titanium dioxide has a high refractive index, which differs greatly from that of polymers, enabling it to efficiently scatter all visible light and provide basic hiding power and whiteness. The hiding polymer emulsion (U-Creation E) consists of hollow microspheres filled with air. The refractive index of its polymer shell is approximately 1.5, while the refractive index of its internal air is 1.0. This significant difference generates strong light scattering at the micrometer scale, significantly enhancing dry hiding power. It complements the scattering wavelength of titanium dioxide, producing a synergistic effect. Ultrafine silica matting powder forms a microscopic rough structure on the paint film surface. When light shines on it, diffuse reflection occurs, eliminating specular reflection and producing a soft matte effect. Its nanoscale particle size ensures that the smooth feel of the paint film is not affected while achieving matte finish.

[0012] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: On the one hand, the present invention eliminates the source of VOC and harmful substance release at the source; on the other hand, after the latex paint film is formed, the dense polymer paint film forms a barrier, which can effectively prevent any potential substances inside from migrating into the indoor environment, thereby significantly reducing the VOC content of the latex paint of the present invention to as low as 0.022 mg / m³. 3 Meanwhile, the paint film formed by this invention has excellent scrub resistance (maintaining the integrity of the paint film after ≥30,000 cycles); finally, this invention can also fix and decompose formaldehyde molecules through the physical adsorption and chemical catalysis (reacting with formaldehyde in an irreversible Schiff base reaction) of the anti-formaldehyde additive, thereby achieving continuous purification. Attached Figure Description

[0013] Figure 1 The image shows the appearance of the paint film formed in Example 1 after 30,000 scrubbing cycles, according to GB / T 9266-2009 standard; Figure 2 The appearance of the paint film formed in Comparative Example 5 after 2000 scrubbing cycles is shown in GB / T 9266-2009 standard. Detailed Implementation

[0014] Example 1 The latex paint of this invention is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 10 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 42 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.9 parts of deionized water.

[0015] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 12 parts by weight, the amount added in Component B is 1 part by weight, and the amount added in Component D is 0.9 parts by weight.

[0016] The method for preparing the latex paint of the present invention specifically includes the following steps: (1) Add the water from material A into a clean dispersion tank, start stirring, and stir at 600 r / min; while stirring, add the remaining material from material A into the dispersion tank and continue stirring for 5 min; (2) Increase the dispersion speed to 1000 r / min and continue stirring for 20 min; then put material B into the dispersion tank and continuously adjust the height of the dispersion disc (from 1 / 6 of the blade diameter (D) to 1 / 4) to ensure that material B can easily enter the slurry. After feeding, wash the edge. (3) Continue dispersing at 1000 r / min for 20 min, then send for fineness testing. Once the fineness test is passed (≤50µm), transfer it to the paint mixing tank. (4) Add material C to the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersing disc until the slurry tumbles noticeably, and stir at low speed for 5 min; (5) Add material D to the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersing plate until the slurry tumbles obviously, stir at low speed for 15 min, and drain the bottom valve once; (6) Submit for inspection. After passing the inspection, filter and package the white paint to obtain the finished product. If color matching is required, match the color according to the color matching requirements. After the color matching is completed, submit for inspection. After passing the inspection, filter and package the finished product to obtain the finished product.

[0017] Example 2 The latex paint of this invention is composed of the following components in parts by weight: 0.05 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 10 parts of ultrafine heavy calcium carbonate, 2 parts of ultrafine matting agent, 42 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1.5 parts of leveling agent, and 12.35 parts of deionized water.

[0018] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 10.5 parts by weight, the amount added in Component B is 0.95 parts by weight, and the amount added in Component D is 0.9 parts by weight.

[0019] The feeding method in the preparation of latex paint in Example 2 is the same as in Example 1, specifically: (1) Add the water from material A into a clean dispersion tank, start stirring, and stir at 600 r / min; while stirring, add the remaining material from material A into the dispersion tank and continue stirring for 5 min; (2) Increase the dispersion speed to 1000 r / min and continue stirring for 20 min; then put material B into the dispersion tank and continuously adjust the height of the dispersion disc (from 1 / 6 of the blade diameter (D) to 1 / 4) to ensure that material B can easily enter the slurry. After feeding, wash the edge. (3) Continue dispersing at 1000 r / min for 20 min, then send for fineness testing. Once the fineness test is passed (≤50µm), transfer it to the paint mixing tank. (4) Add material C to the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersing disc until the slurry tumbles noticeably, and stir at low speed for 5 min; (5) Add material D to the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersing plate until the slurry tumbles obviously, stir at low speed for 15 min, and drain the bottom valve once; (6) Submit for inspection. After passing the inspection, filter and package the white paint to obtain the finished product. If color matching is required, match the color according to the color matching requirements. After the color matching is completed, submit for inspection. After passing the inspection, filter and package the finished product to obtain the finished product.

[0020] Example 3 The latex paint of this invention is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.5 parts of wetting agent, 0.5 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.7 parts of defoamer, 25.5 parts of rutile titanium dioxide, 9.5 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 42 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.9 parts of deionized water.

[0021] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, in component A, the amount of defoamer is 0.3 parts by weight, and in component D, the amount of defoamer is 0.4 parts by weight. In component A, the amount of deionized water is 12 parts by weight, in component B, the amount of deionized water is 1 part by weight, and in component D, the amount of deionized water is 0.9 parts by weight.

[0022] The feeding method in the preparation of latex paint in Example 3 is the same as in Example 1.

[0023] Example 4 The latex paint of this invention is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 26.5 parts of rutile titanium dioxide, 10 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 42 parts of film-forming emulsion, 2 parts of covering polymer emulsion, 0.4 parts of bactericide, 2 parts of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 12.9 parts of deionized water.

[0024] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (in accordance with the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (in accordance with the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (in accordance with the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (in accordance with the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 11 parts by weight, the amount added in Component B is 1 part by weight, and the amount added in Component D is 0.9 parts by weight.

[0025] The feeding method in the preparation of latex paint in Example 4 is the same as in Example 1.

[0026] Example 5 The latex paint of this invention is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 26 parts of rutile titanium dioxide, 7 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 45 parts of film-forming emulsion, 2 parts of covering polymer emulsion, 0.4 parts of bactericide, 0.5 parts of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 12.9 parts of deionized water.

[0027] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (in accordance with the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (in accordance with the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (in accordance with the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (in accordance with the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 11 parts by weight, the amount added in Component B is 1 part by weight, and the amount added in Component D is 0.9 parts by weight.

[0028] The feeding method in the preparation of latex paint in Example 5 is the same as in Example 1.

[0029] Example 6 The latex paint of this invention is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 22 parts of rutile titanium dioxide, 13 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 40 parts of film-forming emulsion, 5 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.4 parts of deionized water.

[0030] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in both Component A and Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 11.5 parts by weight, in Component B is 1 part by weight, and in Component D is 0.9 parts by weight.

[0031] The feeding method in the preparation of latex paint in Example 6 is the same as in Example 1.

[0032] Comparative Example 1 - Compared to Example 1, the amount of deionized water added to material A in Comparative Example 1 was 13 parts by weight, specifically: A latex paint is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 10 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 42 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 14.9 parts of deionized water.

[0033] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water. Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water. Component C consists of: film-forming emulsion and covering polymer emulsion. Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water. Specifically, the amount of defoamer added in both Component A and Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 13 parts by weight, in Component B is 1 part by weight, and in Component D is 0.9 parts by weight.

[0034] The feeding method in the preparation of latex paint in Comparative Example 1 is the same as that in Example 1.

[0035] Comparative Example 2 - Compared to Example 1, Comparative Example 2 did not contain a wetting agent in its formulation, specifically: A latex paint is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 10 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 42 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 14.1 parts of deionized water.

[0036] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in both Component A and Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 12.2 parts by weight, in Component B is 1 part by weight, and in Component D is 0.9 parts by weight.

[0037] The feeding method in the preparation of latex paint in Comparative Example 2 is the same as that in Example 1.

[0038] Comparative Example 3 - Compared to Example 1, the formulation of Comparative Example 3 does not contain ultrafine matting powder, specifically: A latex paint is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 11 parts of ultrafine heavy calcium carbonate, 42 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.9 parts of deionized water.

[0039] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 12 parts by weight, the amount added in Component B is 1 part by weight, and the amount added in Component D is 0.9 parts by weight.

[0040] The feeding method in the preparation of latex paint in Comparative Example 3 is the same as that in Example 1.

[0041] Comparative Example 4 - Compared to Example 1, Comparative Example 4's formulation does not contain any formaldehyde-resistant additives, specifically: A latex paint is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 11 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 35 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.9 parts of deionized water.

[0042] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water. Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water. Component C consists of: film-forming emulsion and covering polymer emulsion. Component D consists of: bactericide, fungicide, leveling agent, remaining defoamer, and remaining deionized water. Specifically, the amount of defoamer added in both Component A and Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 12 parts by weight, in Component B is 1 part by weight, and in Component D is 0.9 parts by weight.

[0043] The feeding method in the preparation of latex paint in Comparative Example 4 is the same as that in Example 1.

[0044] Comparative Example 5 A latex paint is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 22.5 parts of rutile titanium dioxide, 20 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 35 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.9 parts of deionized water.

[0045] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 12 parts by weight, the amount added in Component B is 1 part by weight, and the amount added in Component D is 0.9 parts by weight.

[0046] The feeding method in the preparation of latex paint in Comparative Example 5 is the same as that in Example 1.

[0047] Comparative Example 6 - The formulation of Comparative Example 6 is the same as that of Example 1, the only difference being the order of adding ingredients, as follows: (1) Add water from materials A and B into a clean dispersion tank, start stirring at 600 r / min; while stirring, add the remaining materials from materials A and B into the dispersion tank, wash the edges after adding the materials, increase the dispersion speed to 1000 r / min, and continue stirring for 20 min; (3) Send for fineness inspection. After the fineness inspection is qualified (≤50µm), transfer it into the paint mixing tank. If the fineness inspection is unqualified, handle it according to the non-conforming product control procedure; (4) Add materials C and D into the paint mixing tank while stirring at 600 r / min, adjust the height of the dispersion plate until the slurry rolls obviously, stir at low speed for 15 min, and release the bottom valve once; (6) Send for inspection. After the inspection is qualified, filter and package the white paint to obtain the finished product. When color matching is required, color matching is carried out according to the color matching requirements. After color matching is completed, send for inspection. After the inspection is qualified, filter and package to obtain the finished product.

[0048] Comparative Example 7 - Compared to Example 1, Comparative Example 7 increased the content of the film-forming emulsion to 50 parts by weight, specifically: A latex paint is composed of the following components in parts by weight: 0.1 parts of 30,000 cellulose, 0.1 parts of pH adjuster, 0.2 parts of wetting agent, 0.4 parts of ammonium salt dispersant, 0.4 parts of sodium salt dispersant, 0.6 parts of defoamer, 25.5 parts of rutile titanium dioxide, 10 parts of ultrafine heavy calcium carbonate, 1 part of ultrafine matting agent, 50 parts of film-forming emulsion, 3 parts of covering polymer emulsion, 0.4 parts of bactericide, 1 part of formaldehyde-resistant additive, 0.4 parts of mildew inhibitor, 1 part of leveling agent, and 13.9 parts of deionized water.

[0049] The components in the formula are divided into components A, B, C, and D. Component A consists of: 30,000 units of cellulose, pH adjuster, wetting agent, ammonium salt dispersant, sodium salt dispersant, and a portion of defoamer and deionized water (as per the formula amount). Component B consists of: rutile titanium dioxide, ultrafine heavy calcium carbonate, ultrafine matting agent, and a portion of deionized water (as per the formula amount). Component C consists of: film-forming emulsion and covering polymer emulsion (as per the formula amount). Component D consists of: bactericide, formaldehyde-resistant additive, mildew inhibitor, leveling agent, remaining defoamer, and remaining deionized water (as per the formula amount). Specifically, the amount of defoamer added in Component A is 0.3 parts by weight, and the amount added in Component D is 0.3 parts by weight. The amount of deionized water added in Component A is 12 parts by weight, the amount added in Component B is 1 part by weight, and the amount added in Component D is 0.9 parts by weight.

[0050] The feeding method in the preparation of latex paint in Comparative Example 7 is the same as that in Example 1.

[0051] Comparative Example 8 - Compared to Example 1, Comparative Example 8 adjusted the type of covering polymer emulsion, specifically: Adopted (Dow Chemical AVANSE) TM The solid polymer particle structure replaces the hollow microsphere structure of the covering polymer emulsion (U-Creation E) in Example 1.

[0052] The properties of the paint films formed by the latex paints in Examples 1-6 and Comparative Examples 1-8 are shown in Table 1 and Table 2, respectively.

[0053] Table 1

[0054] Table 2 .

Claims

1. A high scrub resistant, low VOC latex paint characterized in that, The composition comprises 3 million cellulose 0.05-0.1 parts, pH regulator 0.1-0.15 parts, wetting agent 0.2-0.5 parts, ammonium salt dispersant 0.4-0.5 parts, sodium salt dispersant 0.4-0.5 parts, defoaming agent 0.6-0.7 parts, rutile titanium dioxide 22-26.5 parts, super-fine heavy calcium 7-13 parts, super-fine matt powder 1-2 parts, film-forming emulsion 40-45 parts, covering polymer emulsion 2-5 parts, fungicide 0.3-0.4 parts, anti-formaldehyde additive 0.5-2 parts, mildew-proof agent 0.3-0.4 parts, leveling agent 1-1.5 parts and deionized water 12-13.9 parts.

2. The latex paint of claim 1, wherein: The 3 million cellulose is hydroxyethyl cellulose 250HBR; the wetting agent is Sasol C12-C14 fatty alcohol polyoxyethylene ether.

3. The latex paint of claim 1, wherein: The defoaming agent is polyether siloxane copolymer emulsion, which is added into the system twice.

4. The latex paint of claim 1, wherein: The rutile titanium dioxide is Bili Lian BLR-996 rutile titanium dioxide, with an average particle size of 0.2-0.3 μm.

5. The latex paint of claim 1, wherein: The ultrafine matting powder is ACEMATT OK263 silica matting powder having a specific surface area of 170 ± 30 m 2 / g and an average particle size of 10 to 12 nm.

6. The latex paint of claim 1, wherein: The film-forming emulsion is Dow Chemical 985 pure acrylic copolymer emulsion, with an average particle size of 20-40 nm.

7. The latex paint of claim 1, wherein: The covering polymer emulsion is Dow E emulsion.

8. The latex paint of claim 1, wherein: The fungicide is Ruiluo Ke GY88; the anti-formaldehyde additive is Kefu KF26.

9. The method of preparing the emulsion paint according to claim 1, characterized by, The method comprises the following steps: (1) the components in the formula are divided into A material, B material, C material and D material; wherein the A material is 3 million cellulose, pH regulator, wetting agent, ammonium salt dispersant, sodium salt dispersant, part of defoaming agent and part of deionized water; the B material is rutile titanium dioxide, super-fine heavy calcium, super-fine matt powder and part of deionized water; the C material is film-forming emulsion and covering polymer emulsion; the D material is fungicide, anti-formaldehyde additive, mildew-proof agent, leveling agent, remaining defoaming agent and remaining deionized water; (2) the water in the A material is put into a dispersion cylinder, and stirring is started at 600-650 r / min; the remaining materials in the A material are added into the dispersion cylinder under stirring, and stirring is continued for 5-10 min; (3) the dispersion speed is increased to 1000-1100 r / min, and stirring is continued for 10-20 min; then the B material is put into the dispersion cylinder, and dispersion is continued at 1000-1100 r / min for 20-30 min; after the fineness is detected and the fineness test is qualified, the mixture is transferred into a paint mixing cylinder; (4) the C material is added into the paint mixing cylinder under stirring at 600-650 r / min, the height of the dispersion disc is adjusted to make the slurry roll obviously, and stirring is continued at the speed for 5-10 min; (5) the D material is added into the paint mixing cylinder under stirring at 600-650 r / min, the height of the dispersion disc is adjusted to make the slurry roll obviously, and stirring is continued at the speed for 15-20 min, and the bottom valve is opened once; (6) the mixture is detected, and after the test is qualified, the white paint is filtered, packaged and finished; if color matching is needed, the color matching is performed according to the color matching requirements, the mixture is detected after the color matching is completed, and after the test is qualified, the mixture is filtered, packaged and finished.

10. The method of claim 9, wherein: In step (1), the amount of the defoaming agent added in the A material is 42-50% of the total amount of the defoaming agent; in the A material, the amount of the deionized water added is 85-86.5% of the total amount of the deionized water; in the B material, the amount of the deionized water added is 7-8% of the total amount of the deionized water.

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