Environment-friendly bamboo charcoal formaldehyde-removing interior wall paint and preparation method thereof

Abstract

The invention relates to the technical field of environment-friendly paint, in particular to environment-friendly bamboo charcoal formaldehyde-removing interior wall paint and a preparation method thereof. The environment-friendly bamboo charcoal formaldehyde-removing interior wall paint is prepared from formaldehyde-removing emulsion, elastic emulsion, bamboo charcoal powder, pigment filler, a mildew preventive, nano silver ions, a dispersing agent, a defoaming agent, a thickening agent and a coalescing agent; the formaldehyde-removing emulsion and the bamboo charcoal powder in the formula can effectively adsorb and decompose formaldehyde and other harmful gases in the air and remarkably improve the indoor air quality, the elastic emulsion endows a paint film with excellent elasticity and flexibility, cracks of a wall surface caused by tiny movement or temperature change of a base layer can be effectively prevented, the service life of the coating is prolonged, and the coating can be applied to the field of wall decoration. Meanwhile, nano-silver ions are added, growth of molds and bacteria can be inhibited, the wall surface is kept clean and sanitary, the paint is particularly suitable for a humid environment, nano-silicon dioxide can improve the hardness, wear resistance and scrubbing resistance of a paint film, and the wall surface is easier to clean and maintain.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly paints, and in particular to an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint and a preparation method thereof. Background Art

[0002] Environmentally friendly bamboo charcoal formaldehyde-free interior wall paint is an innovative high-quality paint designed to create a healthy and comfortable indoor environment. It incorporates bamboo charcoal ingredients, which can efficiently absorb and decompose harmful gases such as formaldehyde in the air, and continuously purify indoor air. The raw materials of environmentally friendly bamboo charcoal formaldehyde-free interior wall paint are pre-dispersed and then ground, and then emulsion and various additives are added, and then mixed evenly by low-speed stirring to form a uniform paint slurry. The paint slurry is filtered, and the viscosity, fineness and formaldehyde purification of the filtered paint liquid are tested to ensure that the paint liquid meets the requirements before packaging and storage; Environmentally friendly bamboo charcoal formaldehyde-free interior wall paint is used on interior walls. If it is exposed to a hot and humid environment for a long time, mildew spots will appear on the wall and the wall will peel or crack, which will cause limitations.

[0003] Therefore, we propose an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint and a preparation method thereof. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, which overcomes the deficiencies in the prior art and aims to solve the problems in the background technology.

[0005] To achieve the above object, the present invention provides the following technical scheme: an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, comprising formaldehyde-free emulsion, elastic emulsion, bamboo charcoal powder, pigments and fillers, mildew inhibitor, nano silver ions, dispersant, defoamer, thickener and film-forming aid; the weight proportion of formaldehyde-free emulsion, elastic emulsion, bamboo charcoal powder, pigments and fillers, mildew inhibitor, nano silver ions, dispersant, defoamer, thickener and film-forming aid is as follows: Formaldehyde-free emulsion (25%-30%), elastic emulsion (5%-10%), bamboo charcoal powder (5%-10%), nano-silicon dioxide (1%-3%), pigments and fillers (30%-40%), mildew inhibitors (2%-6%), nano-silver ions (1%-2%), dispersants (1%-3%), defoaming agents (0.5%-1.5%), thickeners (1%-3%) and film-forming aids (2%-4%).

[0006] Preferably, the pigment filler is a mixture of nano-mica powder and nano-talc powder in equal parts.

[0007] Preferably, the formaldehyde-free emulsion is a pure acrylic emulsion; and the elastic emulsion is a styrene-acrylate elastic emulsion.

[0008] A method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, the method comprising the following steps: S1. Modifying bamboo charcoal powder to enhance its ability to absorb and decompose formaldehyde, and then mixing pigments and fillers with part of dispersant and water, and stirring at high speed to form a uniform pigment and filler slurry; S2, the aldehyde-free emulsion and the elastic emulsion are added to the reactor according to the formula ratio, mixed evenly under low-speed stirring, and then the modified bamboo charcoal powder, nano silicon dioxide and color filler slurry are slowly added to the mixed emulsion respectively, and then under stirring, the mildew inhibitor and nano silver ion are added to the mixed emulsion according to the proportion, and then the dispersant, defoamer, thickener and film-forming aid are added in proportion in sequence; S3. Use a colloid mill to coarsely and finely grind the mixed emulsion, and then filter it to obtain a paint liquid. Use a testing device to test the performance of the paint liquid, and package the paint liquid after the test is completed.

[0009] Preferably, in S3, the detection device comprises a base, a clamping block, a fixed block, a wiping block and a sealing cover; the clamping block is fixedly connected to the base; a cement board is clamped on the clamping block; the fixed block is fixedly connected to the base; the sealing cover covers the outside of the clamping block and the fixed block; a wiping motor is fixedly connected to the fixed block; a moving block is slidably connected to the fixed block; a screw rod that is threadedly matched with the moving block is fixedly connected to the output end of the wiping motor; the wiping block is installed on the moving block; The base is provided with a sliding groove; a sliding frame is slidably connected in the sliding groove; an ultraviolet irradiation lamp and a nozzle are fixedly connected to the sliding frame; a sliding motor is fixedly connected in the sliding groove; a screw rod matched with the thread of the sliding frame is fixedly connected to the output end of the sliding motor.

[0010] Preferably, in S3, a telescopic groove is provided on the moving block; a telescopic block is slidably connected in the telescopic groove; a telescopic spring is fixedly connected to the telescopic block; the wiping block is slidably connected in the moving block, and the wiping block is fixedly connected to the telescopic spring; an adjusting rod is rotatably connected to the moving block; the adjusting rod is threadably matched with the telescopic block.

[0011] Preferably, in S3, two sides of the wiping block are arranged in an arc shape.

[0012] Beneficial effects of the present invention: 1. The formaldehyde-free emulsion and bamboo charcoal powder in the formula of the environmentally friendly bamboo charcoal formaldehyde-free interior wall paint of the present invention can effectively absorb and decompose harmful gases such as formaldehyde in the air, significantly improving indoor air quality. At the same time, the addition of nano silver ions can inhibit the growth of mold and bacteria, keep the wall clean and hygienic, and is particularly suitable for humid environments. Nano silicon dioxide can improve the hardness, wear resistance and scrub resistance of the paint film, making the wall easier to clean and maintain.

[0013] 2. The present invention uses the detection equipment to irradiate ultraviolet rays and spray salt baths when testing interior wall paint, simulating the effects of sunlight and a humid environment on interior wall paint, thereby improving the testing standards for interior wall paint and making the test results more scientific. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a detection device in a method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint according to the present invention; Figure 2 It is a cross-sectional view of the moving block, the telescopic block and the wiping block in the present invention; Figure 3 It is a schematic diagram of the structure of the sliding frame, ultraviolet lamp and nozzle in the present invention.

[0015] In the figure: 1. base; 2. clamping block; 3. fixing block; 4. wiping block; 5. sealing cover; 6. wiping motor; 61. moving block; 62. sliding groove; 63. sliding frame; 64. ultraviolet lamp; 65. nozzle; 66. sliding motor; 67. telescopic groove; 68. telescopic block; 69. telescopic spring; 7. adjusting rod. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Embodiment 1: An environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, comprising formaldehyde-free emulsion, elastic emulsion, bamboo charcoal powder, pigments and fillers, mildew inhibitor, nano silver ions, dispersant, defoamer, thickener and film-forming aid; the weight proportion of formaldehyde-free emulsion, elastic emulsion, bamboo charcoal powder, pigments and fillers, mildew inhibitor, nano silver ions, dispersant, defoamer, thickener and film-forming aid is as follows: Formaldehyde-free emulsion (30%), elastic emulsion (10%), bamboo charcoal powder (9%), nano-silicon dioxide (3%), pigments and fillers (30%), mildew inhibitors (5%), nano-silver ions (2%), dispersants (3%), defoaming agents (1%), thickeners (3%) and film-forming aids (4%).

[0018] The present invention contains 30% of formaldehyde-free emulsion and 9% of bamboo charcoal powder, which can effectively absorb and decompose harmful gases such as formaldehyde in the air, and significantly improve indoor air quality; 10% elastic emulsion gives the paint film excellent elasticity and scalability, which can effectively prevent cracks on the wall due to slight movement of the base layer or temperature changes, and extend the service life of the coating; 5% mildew-proof agent and 1%-2% nano silver ions work together to inhibit the growth of mildew and bacteria, keeping the wall clean and sanitary, especially suitable for humid environments; 30% pigments and fillers and 3% nano-silicon dioxide can improve the hardness, wear resistance and scrub resistance of the paint film, making the wall easier to clean and maintain; 3% dispersant helps to ensure uniform dispersion of the components and avoid agglomeration of pigments and fillers, thus ensuring the stability of the quality and performance of the coating; 1% defoamer can reduce bubbles generated during construction, 3% thickener can adjust the viscosity of the paint to make it easy to construct and apply, and 4% film-forming aid helps to form a continuous, uniform paint film with good performance.

[0019] In the present invention, the pigment and filler are selected from nano-mica powder and nano-talc powder mixed in equal parts.

[0020] In the present invention, the formaldehyde-free emulsion is pure acrylic emulsion; and the elastic emulsion is styrene-acrylate elastic emulsion.

[0021] In the present invention, the flaky structures of nano-mica powder and nano-talc powder can increase the flexibility and crack resistance of the paint film, reduce the cracking phenomenon of the paint film caused by temperature changes or micro-movement of the base layer, and the synergistic effect of the two helps to enhance the density of the paint film, thereby increasing the number of times the paint can withstand scrubbing, making the wall easier to clean and maintain; the nano-mica powder and nano-talc powder mixed in equal parts can optimize the leveling property of the paint, making it easier to evenly apply the paint liquid during the construction process, reducing brush marks and sagging phenomena, and improving the coating quality, and the nano-scale particle size and special morphology can better fill and cover the fine pores and defects on the wall surface; In the present invention, the pure acrylic emulsion has good chemical stability and reactivity, and can react with formaldehyde more effectively, thereby enhancing the formaldehyde removal ability of the coating and continuously improving the indoor air quality; the styrene-acrylate elastic emulsion can effectively adapt to the slight deformation and temperature change of the base layer, prevent cracks from forming on the wall surface, and maintain the integrity of the coating; it improves the waterproof performance of the coating, reduces the damage to the wall surface caused by water penetration, and helps to maintain the elasticity and formaldehyde removal effect of the paint film, thereby improving the formaldehyde removal effect and anti-cracking and peeling ability of the environmentally friendly bamboo charcoal formaldehyde removal interior wall paint of the present invention.

[0022] Embodiment 2: A method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, the steps of the method are as follows: S1. Modifying bamboo charcoal powder to enhance its ability to absorb and decompose formaldehyde, and then mixing pigments and fillers with part of dispersant and water, and stirring at high speed to form a uniform pigment and filler slurry; First, the bamboo charcoal powder is treated with plasma to modify its surface, increase its surface active sites and roughness, improve its adsorption and decomposition performance, and thus significantly enhance the ability of the bamboo charcoal powder to adsorb and decompose formaldehyde; then, the pigment filler is mixed with a dispersant and an appropriate amount of water in proportion, and then vigorously stirred with a high-speed stirring device. During the stirring process, the stirring speed, time, temperature and other parameters are strictly controlled to ensure that the pigment filler can fully blend with the dispersant and water, and finally form a uniform, stable and delicate pigment filler slurry; S2, the aldehyde-free emulsion and the elastic emulsion are added to the reactor according to the formula ratio, mixed evenly under low-speed stirring, and then the modified bamboo charcoal powder, nano silicon dioxide and color filler slurry are slowly added to the mixed emulsion respectively, and then under stirring, the mildew inhibitor and nano silver ion are added to the mixed emulsion according to the proportion, and then the dispersant, defoamer, thickener and film-forming aid are added in proportion in sequence; Adding mildew-proof agent and nano silver ion in proportion under stirring can make them dispersed evenly in the emulsion, give full play to the synergistic effect, enhance the antibacterial and mildew-proof performance of interior wall paint, effectively inhibit the growth of mildew and bacteria, and keep the wall surface clean and hygienic for a long time. At the same time, adding dispersant, defoamer, thickener and film-forming aid in proportion in sequence can help adjust the dispersibility, defoaming effect, viscosity and film-forming performance of the paint; S3, using a colloid mill to coarsely grind and finely grind the mixed emulsion, and then filtering to obtain a paint liquid, and then using a testing device to test the performance of the paint liquid, and then packaging the paint liquid after the test is completed; Through the coarse and fine grinding of the colloid mill, the particles in the emulsion can be made smaller and evenly distributed, thus significantly improving the fineness and stability of the paint liquid. This helps to improve the flatness, glossiness and hiding power of the paint film, making the wall coating effect more beautiful.

[0023] In the present invention, in S3, the detection device includes a base 1, a clamping block 2, a fixed block 3, a wiping block 4 and a sealing cover 5; the clamping block 2 is fixedly connected to the base 1; the clamping block 2 clamps a cement board; the fixed block 3 is fixedly connected to the base 1; the sealing cover 5 covers the outside of the clamping block 2 and the fixed block 3; the fixed block 3 is fixedly connected with a wiping motor 6; the fixed block 3 is slidably connected with a moving block 61; the output end of the wiping motor 6 is fixedly connected with a screw threaded with the moving block 61; the wiping block 4 is installed on the moving block 61; The base 1 is provided with a slide groove 62; a slide frame 63 is slidably connected in the slide groove 62; an ultraviolet irradiation lamp 64 and a nozzle 65 are fixedly connected to the slide frame 63; a slide motor 66 is fixedly connected in the slide groove 62; a screw rod matched with the slide frame thread is fixedly connected to the output end of the slide motor 66.

[0024] In the present invention, in S3, a telescopic groove 67 is provided on the moving block 61; a telescopic block 68 is slidably connected in the telescopic groove 67; a telescopic spring 69 is fixedly connected to the telescopic block 68; the wiping block 4 is slidably connected in the moving block 61, and the wiping block 4 is fixedly connected to the telescopic spring 69; an adjusting rod 7 is rotatably connected to the moving block 61; the adjusting rod 7 is threadedly matched with the telescopic block 68.

[0025] In the present invention, in S3, both sides of the wiping block 4 are arranged in an arc shape.

[0026] In the present invention, an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint is applied to a cement board, and then the cement board is clamped on a clamping block 2 after the paint is dried and solidified, and then a sealing cover 5 is covered on the base 1; in the present invention, the sealing cover 5 is selected to be a transparent material, such as glass; The wiping motor 6 drives the corresponding screw rod to rotate, so that the moving block 61 moves with the wiping block 4, so that when the wiping block 4 moves above the cement board, the wiping block 4 rubs the interior wall paint on the cement board, thereby performing a friction resistance test on the interior wall paint. During the test, the ultraviolet lamp on the sliding frame irradiates ultraviolet rays to oxidize the interior wall paint, accelerate the aging of the interior wall paint, and simulate the oxidation of the interior wall paint by sunlight; In the present invention, a nozzle 65 is provided on the sliding frame, and the liquid containing mold can be sprayed on the interior wall paint on the cement board through the nozzle 65, so that the interior wall paint is moist and stained with mold, thereby verifying the antibacterial and anticorrosive effect of the interior wall paint; In the present invention, a telescopic block 68 is arranged on the moving block 61, and the wiping block 4 is connected to the telescopic block 68 via a telescopic spring 69. Therefore, the position of the telescopic block 68 can be adjusted by rotating the adjusting rod 7, thereby adjusting the length of the wiping block 4 exposed from the moving block 61, thereby adjusting the thrust of the telescopic spring 69 on the wiping block 4 when the wiping block 4 contacts the interior wall paint. Therefore, the present invention can adjust the force of the wiping block 4 on the interior wall paint. The two sides of the wiping block 4 are arranged in an arc shape, which can play a guiding role in the process of the wiping block 4 moving onto the cement board.

[0027] Experimental verification Experiment 1: Formaldehyde removal performance test; Experimental purpose: To test the purification effect of interior wall paint on formaldehyde; Experimental equipment and materials: sealed test box, formaldehyde detector, formaldehyde solution, sample plate coated with the interior wall paint of the present invention and sample plate coated with control paint; Experimental steps: Inject 500 ml of 35% formaldehyde solution into a sealed test box to make the initial formaldehyde concentration reach a high level, put the sample coated with interior wall paint into the test box as the experimental group, and then inject 500 ml of 35% formaldehyde solution into another sealed test box, put in the sample coated with control paint, and use a formaldehyde detector to measure the formaldehyde concentration in the two sealed test boxes at regular intervals (such as 1 hour, 2 hours, 4 hours, 8 hours, 24 hours).

[0028] Table 1 Experiment 2: Anti-mildew performance test; Experimental purpose: To test the anti-mildew effect of interior wall paint; Experimental equipment and materials: mold spore suspension, sample coated with interior wall paint of the present invention, sample coated with control paint; Experimental steps: The mold spore suspension is evenly sprayed on the sample coated with the interior wall paint of the present invention and the sample coated with the control paint, and then the two samples are placed in an environment of 24 degrees Celsius for a certain period of time (such as 7 days, 14 days), and the suspension is sprayed every day to replenish moisture, and the growth of mold on the surface of the two samples is observed and measured.

[0029] Table 2 Experiment 3: Scrub resistance test; Experimental purpose: To test the scrub resistance of interior wall paint; Experimental equipment and materials: the testing equipment of the present invention, a sample plate coated with the interior wall paint of the present invention, and a sample plate coated with a control paint; Experimental steps: fix the sample on the testing equipment, wipe the sample surface back and forth with the wiping block on the testing equipment, and irradiate the sample surface with ultraviolet light, and record the changes in the sample surface after wiping a certain number of times (such as 500 times, 1000 times, 2000 times); wherein Table 3 is an experimental table of the sample coated with the interior wall paint of the present invention, and Table 4 is an experimental table of the sample coated with the control paint; Table 3 Table 4 Experiment 1 (formaldehyde removal performance test) summary: The interior wall paint with a specific formula used by the test group showed a significant formaldehyde removal effect. Within 24 hours, the formaldehyde concentration was significantly reduced from the initial 100mg / m³ to 5mg / m³, and the formaldehyde removal rate reached 95%. This shows that the interior wall paint performs well in purifying formaldehyde in indoor air and can provide effective air purification for the living environment.

[0030] Experiment 2 (anti-mildew performance test) summary: After 7 and 14 days of observation, the interior wall paint of the test group showed good anti-mildew performance. There were only a few mold spots at 7 days, and the mold spots increased slightly at 14 days. The mold coverage area was relatively small, only 10%. This shows that the interior wall paint can inhibit the growth and reproduction of mold to a certain extent, providing a certain degree of anti-mildew protection for the wall surface.

[0031] Experiment 3 (scrub resistance and UV oxidation test) summary: Under different wiping forces, the scrub resistance of the interior wall paint varies. Under a lower wiping force (5N), only after 2000 scrubbings did a slight bottom exposure appear locally; under a higher wiping force (15N), a larger area of ​​bottom exposure appeared after 1000 scrubbings. At the same time, after ultraviolet irradiation, the surface of the sample also showed different degrees of changes. Under a lower irradiation time (50h), the color faded slightly; as the irradiation time increased (150h), peeling and cracking appeared, but the degree of change was less than that of the control group. This shows that the interior wall paint has a certain scrub resistance, but it is greatly affected by the wiping force, and there will be a certain degree of aging under ultraviolet irradiation, but the overall performance is still better than the control group.

[0032] In summary, the interior wall paint of the present invention performs well in terms of formaldehyde removal and mildew prevention, and its scrub resistance and anti-ultraviolet oxidation performance can meet the requirements under certain conditions, but there is still room for improvement under high-intensity wiping and long-term ultraviolet irradiation.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected; the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, characterized in that: The invention comprises formaldehyde-free emulsion, elastic emulsion, bamboo charcoal powder, pigment filler, mildew-proof agent, nano silver ion, dispersant, defoamer, thickener and film-forming aid; the weight proportion of formaldehyde-free emulsion, elastic emulsion, bamboo charcoal powder, pigment filler, mildew-proof agent, nano silver ion, dispersant, defoamer, thickener and film-forming aid is as follows: Formaldehyde-free emulsion (25%-30%), elastic emulsion (5%-10%), bamboo charcoal powder (5%-10%), nano-silicon dioxide (1%-3%), pigments and fillers (30%-40%), mildew inhibitors (2%-6%), nano-silver ions (1%-2%), dispersants (1%-3%), defoaming agents (0.5%-1.5%), thickeners (1%-3%) and film-forming aids (2%-4%).

2. The environmentally friendly bamboo charcoal formaldehyde-free interior wall paint according to claim 1, characterized in that: The pigment and filler are selected from nano-mica powder and nano-talc powder mixed in equal parts.

3. The environmentally friendly bamboo charcoal formaldehyde-free interior wall paint according to claim 2, characterized in that: The formaldehyde-free emulsion is pure acrylic emulsion; the elastic emulsion is styrene-acrylate elastic emulsion.

4. A method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint, characterized in that: The steps of this method are as follows: S1. Modifying bamboo charcoal powder to enhance its ability to absorb and decompose formaldehyde, and then mixing pigments and fillers with part of dispersant and water, and stirring at high speed to form a uniform pigment and filler slurry; S2, the aldehyde-free emulsion and the elastic emulsion are added to the reactor according to the formula ratio, mixed evenly under low-speed stirring, and then the modified bamboo charcoal powder, nano silicon dioxide and color filler slurry are slowly added to the mixed emulsion respectively, and then under stirring, the mildew inhibitor and nano silver ion are added to the mixed emulsion according to the proportion, and then the dispersant, defoamer, thickener and film-forming aid are added in proportion in sequence; S3. Use a colloid mill to coarsely and finely grind the mixed emulsion, and then filter it to obtain a paint liquid. Use a testing device to test the performance of the paint liquid, and package the paint liquid after the test is completed.

5. The method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint according to claim 4, characterized in that: In S3, the detection device comprises a base (1), a clamping block (2), a fixed block (3), a wiping block (4) and a sealing cover (5); the clamping block (2) is fixedly connected to the base (1); a cement board is clamped on the clamping block (2); the fixed block (3) is fixedly connected to the base (1); the sealing cover (5) covers the outside of the clamping block (2) and the fixed block (3); a wiping motor (6) is fixedly connected to the fixed block (3); a moving block (61) is slidably connected to the fixed block (3); a screw rod threadedly matched with the moving block (61) is fixedly connected to the output end of the wiping motor (6); the wiping block (4) is mounted on the moving block (61); The base (1) is provided with a sliding groove (62); a sliding frame (63) is slidably connected in the sliding groove (62); an ultraviolet irradiation lamp (64) and a nozzle (65) are fixedly connected to the sliding frame (63); a sliding motor (66) is fixedly connected in the sliding groove (62); and a screw rod that is threadably matched with the sliding frame is fixedly connected to the output end of the sliding motor (66).

6. The method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint according to claim 5, characterized in that: In S3, the moving block (61) is provided with a telescopic groove (67); a telescopic block (68) is slidably connected in the telescopic groove (67); a telescopic spring (69) is fixedly connected to the telescopic block (68); the wiping block (4) is slidably connected in the moving block (61), and the wiping block (4) is fixedly connected to the telescopic spring (69); an adjusting rod (7) is rotatably connected to the moving block (61); and the adjusting rod (7) is threadably engaged with the telescopic block (68).

7. The method for preparing an environmentally friendly bamboo charcoal formaldehyde-free interior wall paint according to claim 6, characterized in that: In S3, the two sides of the wiping block (4) are arranged in an arc shape.

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