High-coverage interior wall coating and preparation method thereof
By optimizing the formulation and mixing process of high-covered interior wall coatings, the problems of poor wet covering and cracking of existing paints during construction are solved, and the effect of efficient and one-spread coating is achieved.
Patent Information
- Application Number
- CN202510425568.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-06-27
AI Technical Summary
The existing high-covered interior wall paint has problems such as poor wet covering and cracking during construction, resulting in increased paint consumption and low construction efficiency.
High-covered interior wall coating consisting of hydroxyethyl cellulose, additives, titanium dioxide, kaolin, mica powder, talc, heavy calcium, emulsion and water is used to improve the dispersion of titanium dioxide and the cracking resistance of mica powder and talc powder by optimizing the formulation and stirring process.
It achieves excellent dry and wet hiding and crack resistance of high-covered interior wall coatings, which can ensure high efficiency and reduce paint consumption during one-spread coating.
Smart Images
Figure CN120209641A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a high-hiding interior wall coating and a preparation method thereof, belonging to the technical field of coatings. Background Art
[0002] For the construction process of existing interior wall architectural coatings, more than 90% of the construction techniques adopt the one-prime-two-topcoats or two-topcoats process. However, with the increasing labor cost and the shortening of the project delivery time, fast-drying high-hiding one-coat construction water-based interior wall paint products have gradually come onto the market and are favored by construction workers. Nevertheless, there are still some important product defects: First, the wet hiding power is poor. The dry hiding power of existing high-hiding products can meet the requirements of excellent products in the national standard GB / T9756. However, what construction workers are most concerned about is the wet hiding performance. If the wet hiding power shows through or the covering performance is not good, workers often have to apply one more coat by brushing or spraying, increasing the paint consumption. Second, construction cracking occurs. Currently, except for artistic paints, more than 80% of the construction methods of ordinary paints are spraying. There is a phenomenon of construction spraying cracking in existing technical products, especially in thick-coated areas, which is particularly easy to occur and obvious. Summary of the Invention
[0003] In view of the above problems, the present invention provides a high-hiding interior wall coating and a preparation method thereof. The specific solutions are as follows: A high-hiding interior wall coating is composed of the following raw materials in parts by weight: 0.3 - 0.5 part of hydroxyethyl cellulose; 3.0 - 6.0 parts of additives; 23 - 26 parts of titanium dioxide; 7 - 10 parts of kaolin; 1 - 3 parts of mica powder; 2 - 4 parts of talc powder; 10 - 13 parts of 800-mesh heavy calcium carbonate; 11 - 14 parts of emulsion; 31.5 - 34 parts of water.
[0004] Preferably, the molecular weight of the hydroxyethyl cellulose is 30,000 cellulose; Preferably, the total weight proportion of titanium dioxide and kaolin (excluding moisture) is 31 - 34%; Preferably, the mica powder is 800 - 1250 mesh, the talc powder is 1250 mesh, and the total weight proportion of mica powder and talc powder (excluding moisture) needs to be 5 - 7.5%; Mica powder and talc powder have flaky and plate-like structures, which can play an anti-cracking role in appropriate proportions. If the proportion is too high, the paint film will become dull, and if the proportion is too low, the anti-cracking effect will not be achieved.
[0005] Preferably, the emulsion is a freeze-thaw resistant styrene-acrylic emulsion, and the antifreeze can be not added, with a net smell and environmental protection; Preferably, the ratio of the emulsion to the fillers (titanium dioxide, kaolin, mica powder, talc powder, 800-mesh heavy calcium carbonate) is 0.24 - 0.28; within this range, the coating has excellent dry and wet hiding capabilities.
[0006] Further, the additives include 0.2 - 0.3 parts of pre-defoamer, 0.5 - 0.8 parts of dispersant, 0.1 - 0.3 parts of wetting agent, 0.1 - 0.2 parts of pH stabilizer, 1.5 - 3 parts of film-forming aid, 0.1 - 0.3 parts of post-defoamer, 0.4 - 0.7 parts of bactericidal and preservative agent, 0.2 - 0.5 parts of mildew-proof agent and 0.2 - 0.4 parts of leveling agent. The dry and wet hiding power contrast ratio of the interior wall paint provided by the present invention exceeds 0.98, and the low-temperature film formation of the 500-μm wet film has no cracking, having the wet hiding advantage of the paint film with one coat.
[0007] The following provides a preparation method of the paint of the present invention. The first preparation method includes the following steps: 1) Preparation of the base material: Add water into a disperser, add hydroxyethyl cellulose while stirring, and after the hydroxyethyl cellulose is dissolved, add a dispersant, a wetting agent, a pre-defoamer, and a film-forming aid, stir evenly to obtain the base material, and switch to high-speed stirring; 2) While stirring, sequentially add titanium dioxide, kaolin, mica powder, talc powder, heavy calcium carbonate, and pH stabilizer, adjust to low-speed stirring after high-speed stirring and dispersing evenly, detect that the dispersibility is ≤ 50 μm, add emulsion, bactericidal and preservative agent, mildew-proof agent, post-defoamer, and leveling agent, and stir evenly to obtain the product.
[0008] In the present invention, in order to improve the wet hiding of the paint and realize the one-coat process, the ratios of titanium dioxide, fillers, and emulsion used are different from those of the prior art. The viscosity of the paint prepared by the above method is above 110 KU, while the viscosity of ordinary interior wall paints is generally 70 - 90 KU. Since the titanium dioxide in the paint provides the main hiding power effect, the dispersion degree of titanium dioxide directly affects the hiding power performance of the paint during the preparation of the paint. After the formula is changed, the viscosity of the slurry increases and the dispersion difficulty improves.
[0009] Increasing the stirring speed and prolonging the stirring time can solve this problem to a certain extent, but it will cause the wear of titanium dioxide particles to intensify. The titanium dioxide in the raw materials generally has a coated structure, and the coating layer itself can improve the dispersion and hiding power effect of titanium dioxide, while the wear of titanium dioxide during the stirring process may damage the coated structure, resulting in a decrease in hiding power. In addition, the wear of titanium dioxide particles will also cause changes in the particle size composition, which will also lead to a decrease in hiding power.
[0010] Similarly, the dispersion difficulty of the remaining fillers in the slurry with a higher viscosity will also increase. For example, mica powder and talc powder that play an anti-cracking role will not play an anti-cracking role if they are not dispersed sufficiently. If the stirring speed is increased or the stirring time is prolonged, their flaky or plate-like structures will be damaged, and their anti-cracking effects will also be reduced.
[0011] To solve this problem, the present invention provides another preparation method. On the basis of the above preparation method, in step 1), the base material is divided into part A and part B. In step 2), part A of the base material is stirred at high speed, and most (50 - 80 wt%) of the titanium dioxide, kaolin, mica powder, talc powder, heavy calcium, and pH stabilizer are added while stirring, and the viscosity is controlled to be ≤80 KU to obtain an intermediate material; the remaining titanium dioxide is added to part B of the base material, and after being stirred evenly at low speed, an adjustment material is obtained. The adjustment material is then mixed with the intermediate material, stirred and dispersed evenly at high speed, and then adjusted to low-speed stirring. After the dispersibility is detected to be ≤40 μm, emulsion, bactericide preservative, mildew preventive, post-defoaming agent, and leveling agent are added, and stirred evenly to obtain the product.
[0012] The technical idea of this method is to first use most of the base material to add appropriate titanium dioxide to prepare an intermediate material with appropriate viscosity, reduce the dispersion difficulty of titanium dioxide and other fillers, pre-mix the remaining titanium dioxide and a small part of the base material as an adjustment material, and finally mix and disperse it with the intermediate material to adjust the final raw material composition and viscosity to the expected range.
[0013] Further, the mass ratio of part A of the base material to part B of the base material is 8:1.
[0014] To achieve the above technical idea and simplify the operation steps, the disperser is provided with a high-speed stirring shaft and a low-speed stirring shaft. The bottom of the low-speed stirring shaft is connected to a chassis through a bearing. A bracket is provided at the top of the disperser. The bracket is provided with a liftable sleeve. The low-speed stirring shaft is coaxially arranged with the sleeve. When the sleeve descends to the lower limit position, it is connected to the chassis; Further, in step 1), the sleeve first rises to the upper limit position. Water and hydroxyethyl cellulose are added to the disperser and stirred evenly to obtain the base material. Then the sleeve descends to the lower limit position and is connected to the chassis. Part of the base material enters the sleeve as part B of the base material, and the base material outside the sleeve is used as part A of the base material; in step 2), while the intermediate material is prepared outside the sleeve, the adjustment material is prepared inside the sleeve. After the intermediate material is prepared, the sleeve rises to the upper limit position, and the adjustment material is mixed with the intermediate material.
[0015] Further, the volume enclosed by the sleeve and the chassis is 1 / 9 of the total volume of the disperser.
[0016] The interior wall paint of the present invention has high dry and covering properties, especially excellent wet covering ability, and at the same time has anti-cracking properties, can achieve one-coat construction, and improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic structural diagram of the disperser in Example 7. DETAILED DESCRIPTION OF THE INVENTION
[0018] The following combines specific examples to detail the solution of the present invention patent.
[0019] Example 1 Add 31.5 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 part of defoamer, 0.20 part of wetting agent, 0.7 part of dispersant, 2.0 parts of odorless film-forming agent. After stirring evenly, increase the rotation speed, and add 25 parts of titanium dioxide, 7.5 parts of kaolin, 2.5 parts of mica powder, 3.0 parts of 1250-mesh talc powder, 12 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min. Detect that the dispersibility is ≤50 μm, then add 13.5 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.28 part of bactericidal and preservative agent, 0.35 part of mildew-proof agent, and 0.3 part of leveling agent, and stir evenly to obtain a high-coverage interior wall paint.
[0020] Example 2 Add 31.5 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 part of defoamer, 0.20 part of wetting agent, 0.7 part of dispersant, 2.0 parts of odorless film-forming agent. After stirring evenly, increase the rotation speed, and add 24.5 parts of titanium dioxide, 9.0 parts of kaolin, 3.0 parts of mica powder, 2.0 parts of 1250-mesh talc powder, 11.5 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min. Detect that the dispersibility is ≤50 μm, then add 13.5 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.28 part of bactericidal and preservative agent, 0.35 part of mildew-proof agent, and 0.3 part of leveling agent, and stir evenly to obtain a high-coverage interior wall paint.
[0021] Example 3 Add 34.0 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 part of defoamer, 0.20 part of wetting agent, 0.7 part of dispersant, 2.0 parts of odorless film-forming agent. After stirring evenly, increase the rotation speed, and add 24.0 parts of titanium dioxide, 9.0 parts of kaolin, 3.0 parts of mica powder, 2.0 parts of 1250-mesh talc powder, 11.0 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min. Detect that the dispersibility is ≤50 μm, then add 12.0 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.28 part of bactericidal and preservative agent, 0.35 part of mildew-proof agent, and 0.3 part of leveling agent, and stir evenly to obtain a high-coverage interior wall paint.
[0022] Example 4 Add 30 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.3 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.2 part of defoamer, 0.1 part of wetting agent, 0.5 part of dispersant, 1.5 parts of odorless film-forming agent, stir evenly, increase the rotation speed, add 23 parts of titanium dioxide, 7 parts of kaolin, 1 part of mica powder, 2.0 parts of 1250-mesh talc powder, 10 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min, detect that the dispersibility is ≤50 μm, add 11 parts of styrene-acrylic emulsion, 0.1 part of defoamer, 0.4 part of bactericidal and preservative agent, 0.2 part of mildew-proof agent, and 0.2 part of leveling agent, and stir evenly to obtain a high-coverage interior wall coating.
[0023] Example 5 Add 34.0 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.5 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.3 part of defoamer, 0.3 part of wetting agent, 0.8 part of dispersant, 3 parts of odorless film-forming agent, stir evenly, increase the rotation speed, add 26 parts of titanium dioxide, 10 parts of kaolin, 3.0 parts of mica powder, 4 parts of 1250-mesh talc powder, 13 parts of 800-mesh heavy calcium carbonate, and 0.2 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min, detect that the dispersibility is ≤50 μm, add 14 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.7 part of bactericidal and preservative agent, 0.5 part of mildew-proof agent, and 0.4 part of leveling agent, and stir evenly to obtain a high-coverage interior wall coating.
[0024] Example 6 Add 31.5 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 part of defoamer, 0.20 part of wetting agent, 0.7 part of dispersant, and 2.0 parts of odorless film-forming agent. After stirring evenly, take 1 / 8 of the base material and add 7 parts of titanium dioxide in another small disperser and stir at 600 - 900 r / min to prepare the adjusted material. Then, add 18 parts of titanium dioxide, 7.5 parts of kaolin, 2.5 parts of mica powder, 3.0 parts of 1250-mesh talc powder, 12 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator to the remaining base material in sequence, disperse evenly at a rotation speed of 2000 - 2500 r / min, detect that the viscosity is 65 ku to obtain the intermediate material. Mix the adjusted material with the intermediate material, continue to disperse evenly at a rotation speed of 2000 - 2500 r / min, then lower the rotation speed to 600 - 900 r / min, detect that the dispersibility is ≤40 μm, add 13.5 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.28 part of bactericidal and preservative agent, 0.35 part of mildew-proof agent, and 0.3 part of leveling agent, and stir evenly to obtain a high-coverage interior wall coating.
[0025] In this embodiment, the preparation method is improved, and the raw material composition is the same as that in Embodiment 1.
[0026] Comparative Example 1 (relative to Embodiment 1, the powder structure, and the total amount of titanium white and kaolin are adjusted) Add 31.5 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 part of defoamer, 0.20 part of wetting agent, 0.7 part of dispersant, 2.0 parts of odorless film-forming agent, and stir evenly. Then increase the rotation speed, add 25.0 parts of titanium dioxide, 9.5 parts of kaolin, 2.5 parts of mica powder, 3.0 parts of 1250-mesh talc powder, 10.0 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min. Detect that the dispersibility is ≤ 50 μm, then add 13.5 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.28 part of bactericidal and preservative agent, 0.35 part of mildew-proof agent, and 0.3 part of leveling agent, and stir evenly to obtain a high-coverage interior wall paint.
[0027] Comparative Example 2 (relative to Embodiment 1, the powder structure, and the total amount of mica powder and talc powder are adjusted) Add 32.0 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 part of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 part of defoamer, 0.20 part of wetting agent, 0.7 part of dispersant, 2.0 parts of odorless film-forming agent, and stir evenly. Then increase the rotation speed, add 24.5 parts of titanium dioxide, 9.0 parts of kaolin, 2.0 parts of mica powder, 2.0 parts of 1250-mesh talc powder, 12.0 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min. Detect that the dispersibility is ≤ 50 μm, then add 13.5 parts of styrene-acrylic emulsion, 0.3 part of defoamer, 0.28 part of bactericidal and preservative agent, 0.35 part of mildew-proof agent, and 0.3 part of leveling agent, and stir evenly to obtain a high-coverage interior wall paint.
[0028] Comparative Example 3 (relative to Embodiment 3, the ratio structure of emulsion and powder is adjusted) Add 34.0 parts of water into a clean dispersion tank, place it in a stirring device, and add 0.48 parts of hydroxyethyl cellulose while stirring. After dissolution, add 0.25 parts of defoamer, 0.20 parts of wetting agent, 0.7 parts of dispersant, 2.0 parts of odorless film-forming agent, stir evenly, increase the rotation speed, add 23.5 parts of titanium dioxide, 8.5 parts of kaolin, 3.0 parts of mica powder, 3.0 parts of 1250-mesh talc powder, 12.0 parts of 800-mesh heavy calcium carbonate, and 0.1 part of pH regulator. After high-speed dispersion evenly at a rotation speed of 2000 - 2500 r / min, lower the rotation speed to 600 - 900 r / min, detect that the dispersion is ≤50μm, add 11.0 parts of styrene-acrylic emulsion, 0.3 parts of defoamer, 0.28 parts of bactericide and preservative, 0.35 parts of mildew preventive, and 0.3 parts of leveling agent, stir evenly to obtain a high-hiding interior wall paint.
[0029] Experimental results Test various technical indicators of the samples of Examples 1 - 6 and the comparative examples according to the technical requirements of the topcoat in GB / T9756 - 2018 "Interior Wall Coatings of Synthetic Resin Emulsion".
[0030] Among them, the viscosity test method: first adjust the sample temperature to 25°C and test with a Stormer viscometer; The low-temperature film-forming property test method: place the sample on a glass plate, then use a 500μm wet film preparation device to scrape and prepare a sample film, and then place the prepared wet film in an incubator at 5°C for 24h of curing, and finally observe the film-forming property on the surface of the paint film; The test method for contrast ratio: carry out according to the provisions of GB / T23981 - 2009; The wet film hiding power is tested with a wet film hiding power tester BGD298; The test method for washability: carry out according to the provisions of GB / T9266 - 2009; The test method for low-temperature stability: carry out the test for 3 cycles according to Method A in GB / T9268 - 2008; The anti-mold test is detected according to the national standard GB / T1741 - 2020 "Method for Determination of Mildew Resistance of Paint Films"; The test method for heat storage stability: put the paint sample into a plastic or glass container of about 1L (height not less than 130mm), fill 2 / 3 of the container, seal it and put it into a constant temperature oven at (50 ± 2)°C. After 30d, take it out, let it cool to room temperature, open the container lid, and gently stir the sample to observe the change of the sample; The test method for workability: Roller coating: Use a roller to roller coat the test sample on a 2m 2 wall surface, observe the running state of the roller, and the effect of the paint film on the wall surface after roller coating; Airless spraying: Use an airless spraying machine to spray the test sample on a 2m 2Spray the sample on the wall surface (it can be undiluted. If diluted, the dilution ratio ≤ 20%), and observe the effect of the wall paint film after spraying. The test results are as follows in Table 1: Table 1 Technical indicators of samples in Examples 1 - 6 and Comparative Examples 1 - 3
[0031]
[0032] It can be seen from the results in Table 1 above that the product of the present invention has excellent dry and wet hiding power, good washability, and very good storage stability. The mildew - proof grade is 0, and there is no cracking phenomenon under various construction processes and conditions. The product of Example 6 has the highest dry and wet hiding power and excellent construction performance compared with other examples. The product of the present invention not only has excellent construction performance, but also has a high spreading rate, low paint consumption, and saves labor and time costs. The raw materials used in the product of the present invention are all very common general - purpose coating raw materials, with low manufacturing cost, applicable to various construction processes and conditions, suitable for large - scale production and promotion, and has a broad market prospect.
[0033] Example 7 In Example 6, two dispersers are required, and the transfer of slurry is involved in the middle, with complex operation and low efficiency.
[0034] In the prior art, there is a disperser with a double - stirrer. The high - speed stirrer in the center plays a dispersing role, and the other low - speed stirrer plays a mixing role. As Figure 1 , based on this structure, a disperser is designed in this example. A cross - shaped frame is set on the top cylinder edge of the disperser, and a movable sleeve 1 is set in the middle of the cross - shaped frame. The low - speed stirrer 2 is located at the center of the sleeve.
[0035] The sleeve is arranged in cooperation with a vertical screw 3 and a guide rod. Rotating the screw can drive the sleeve to move up and down. A chassis 4 is connected to the bottom of the low - speed stirrer by a bearing, and a magnetic - type lock is provided between the chassis and the sleeve. When the sleeve descends to the lower limit position, the bottom of the sleeve is attracted to the chassis, and a cylinder body can be formed by enclosing. When the screw drives the sleeve to rise, the sleeve is separated from the chassis.
[0036] When preparing the coating, the sleeve is first at the upper limit position. According to the normal process, water, cellulose, and additives are added to the disperser to prepare the base material. After the base material is prepared, the sleeve descends and is attracted to the chassis, separating a part of the base material. A small amount of titanium dioxide is added, and the low - speed stirrer is used to prepare the adjusted material. The remaining base material still has most of the titanium dioxide, the remaining powder materials, and additives added in the disperser to prepare the intermediate material. Finally, the sleeve is raised, and the adjusted material and the intermediate material are directly mixed to continue preparing the coating.
[0037] In this solution, in order to reduce the turbulence caused by the sleeve, the sleeve can adopt a smaller length-diameter ratio. The volume of the sleeve is determined according to the proportion of the bottom material to be separated as needed. For example, according to the process of Example 6, if it is necessary to separate the bottom material with a mass ratio of 1 / 9, the volume of the sleeve is designed according to 1 / 9 of the total volume of the disperser.
[0038] This solution realizes the method of the present invention in a disperser, which can simplify the operation steps and improve the production efficiency.
Claims
1. A high hiding interior wall paint, characterized in that: The invention is composed of the following raw materials in parts by weight: 0.3-0.5 parts of hydroxyethyl cellulose; 3.0-6.0 parts of auxiliary agent; 23-26 parts of titanium dioxide; 7-10 parts of kaolin; 1-3 parts of mica powder; 2-4 parts of talc powder; 10-13 parts of 800 mesh heavy calcium; 11-14 parts of emulsion; and 31.5-34 parts of water.
2. The high hiding interior wall paint according to claim 1, characterized in that: The additives include 0.2-0.3 parts of pre-defoaming agent, 0.5-0.8 parts of dispersant, 0.1-0.3 parts of wetting agent, 0.1-0.2 parts of pH stabilizer, 1.5-3 parts of film-forming aid, 0.1-0.3 parts of post-defoaming agent, 0.4-0.7 parts of bactericide and preservative, 0.2-0.5 parts of mildewproofing agent and 0.2-0.4 parts of leveling agent.
3. The method for preparing the high hiding interior wall paint according to claim 2, characterized in that: The following steps are involved: 1) Preparation of base material: add water to the disperser, add hydroxyethyl cellulose while stirring, add dispersant, wetting agent, pre-defoaming agent and film-forming aid after hydroxyethyl cellulose is dissolved, stir evenly to obtain base material, and switch to high-speed stirring; 2) Add titanium dioxide, kaolin, mica powder, talc, heavy calcium and pH stabilizer in sequence while stirring. After high-speed stirring and dispersion, adjust to low-speed stirring. The dispersion is tested to be ≤50μm. Add emulsion, bactericide and preservative, mildew inhibitor, post-defoaming agent and leveling agent, stir evenly to obtain the product.
4. The method for preparing a high hiding interior wall paint according to claim 3, characterized in that: In step 1), the base material is divided into part A and part B. In step 2), part A base material is stirred at high speed, and most of titanium dioxide, kaolin, mica powder, talcum powder, heavy calcium, and pH stabilizer are added while stirring to control the viscosity ≤80KU to obtain an intermediate material; the remaining titanium dioxide is added to part B base material, and the adjusted material is obtained after low-speed stirring. The adjusted material is mixed with the intermediate material, and the high-speed stirring is adjusted to low speed stirring after being dispersed evenly. The dispersion is detected to be ≤40μm, and the emulsion, bactericidal preservative, mildew inhibitor, post-defoaming agent, and leveling agent are added, and the product is obtained after stirring evenly.
5. The method for preparing a high hiding interior wall paint according to claim 4, characterized in that: The mass ratio of base material part A to base material part B is 8:
1.
6. The method for preparing a high hiding interior wall paint according to claim 3, characterized in that: The disperser is provided with a high-speed stirring shaft and a low-speed stirring shaft. The bottom of the low-speed stirring shaft is connected to a chassis through a bearing. A bracket is provided on the top of the disperser. The bracket is provided with a liftable sleeve. The low-speed stirring shaft is coaxially arranged with the sleeve. The sleeve is connected to the chassis when it descends to the lower limit.
7. The method for preparing a high hiding interior wall paint according to claim 6, characterized in that: In step 1), the sleeve first rises to the upper limit, water and hydroxyethyl cellulose are added to the disperser, and the base material is obtained after being stirred evenly, and then the sleeve is lowered to the lower limit, the sleeve and the bottom plate are connected, a part of the base material enters the sleeve as part B base material, and the base material outside the sleeve is used as part A base material; in step 2), while the intermediate material is prepared outside the sleeve, the adjustment material is prepared inside the sleeve. After the intermediate material is prepared, the sleeve rises to the upper limit, and the adjustment material is mixed with the intermediate material.
8. The method for preparing a high hiding interior wall paint according to claim 7, characterized in that: The volume enclosed by the sleeve and the bottom plate is 1 / 9 of the total volume of the disperser.