Preparation method of plant-based interior wall coating

Abstract

The invention relates to a plant-based interior wall coating preparation method, which comprises: S1, mixing deionized water, an anti-mildew bactericide, a dispersant and a defoaming agent, and uniformly stirring; s2, adding the titanium dioxide, the functional filler and the filler, and dispersing at a high speed in a vacuum state until the particle size is less than 50 microns; s3, the plant-based resin emulsion, the water-based synthetic resin emulsion, the coalescing agent, the wetting agent, the flatting agent, the nanometer negative ion additive, the extracting solution, the pH regulator and the thickening agent are added and evenly stirred, the natural plant-based resin emulsion serves as a main film forming matter, and the product is high in plant-based matter content, free of VOC, low in toxicity, low in odor and high in performance; according to the present invention, the plant extract has characteristics of complete coating film, no degradability in the normal state, stable and non-declined performance during the use, strong inhibition effect on bacteria, mold and yeast, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, strong inhibition effect on bacteria, and strong inhibition effect on bacteria, and the lophatherum gracile extract has

Description

Technical Field

[0001] The present invention relates to the field of coatings, and in particular to a method for preparing a plant-based interior wall coating. Background Art

[0002] Plant-based resin emulsion technology, an innovation in the coatings industry, converts non-food straw and other lignocellulosic agricultural and forestry waste into coating resin emulsions. This not only achieves resource recycling but also offers the advantages of natural, low-toxicity, high-performance, and renewable resources. Furthermore, to prevent microbial contamination, preservatives and fungicides have traditionally been added. These chemicals provide a certain degree of protection against mildew.

[0003] Although existing technologies have made certain progress in improving the environmental friendliness and functionality of coatings, there are still some shortcomings. First, while traditional antiseptics, antifungal and fungicides ensure antifungal effects, their chemical components may have potential impacts on human health during degradation. Second, although plant-based resin emulsion technology has brought an opportunity for green transformation to the coatings industry, the sole reliance on chemical preservatives to solve the antifungal problem limits the further improvement of the coating's environmental performance. Therefore, we propose a method for preparing plant-based interior wall coatings. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology, adapt to actual needs, and provide a method for preparing plant-based interior wall paint to solve the problem that while the current traditional anti-corrosion and anti-mildew fungicides ensure the anti-mildew effect, their chemical components may have potential effects on human health during the degradation process. Secondly, although plant-based resin emulsion technology has brought an opportunity for green transformation to the paint industry, the method of relying solely on chemical preservatives to solve the anti-mildew problem limits the technical problem of further improving the environmental protection performance of the paint.

[0005] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is: designing a method for preparing a plant-based interior wall coating, comprising the following steps:

[0006] S1. Mix deionized water, antifungal agent, dispersant and defoamer and stir evenly;

[0007] S2, adding titanium dioxide, functional fillers and fillers, and dispersing them at high speed under vacuum until the particle size is less than 50 microns;

[0008] S3. Add plant-based resin emulsion, water-based synthetic resin emulsion, film-forming aid, wetting agent, leveling agent, nano negative ion aid, extract, pH regulator and thickener, stir evenly to prepare the plant-based interior wall paint.

[0009] Preferably, the extract in step S1 is a mixture of bamboo leaf extract, wormwood extract and lemon essential oil, and the weight proportion of the extract is 2.5%-6%.

[0010] Preferably, the titanium dioxide in step S2 is nano-grade rutile titanium dioxide with a particle size of 10-100 nanometers and a mass proportion of 15%-30%.

[0011] Preferably, the mass proportion of the plant-based resin emulsion in step S3 is 10%-30%, the aqueous synthetic resin emulsion is vinyl acetate-acrylate copolymer emulsion, the solid content is 50%-54%, and the minimum film-forming temperature is 0°C.

[0012] Preferably, the filler in step S2 includes one or more of calcined kaolin, diatomaceous earth and heavy calcium carbonate, with the total mass accounting for 15%-20%.

[0013] Preferably, the functional filler in step S2 is zeolite powder, and the zeolite powder is 200-400 mesh silver-loaded zeolite powder, with a mass percentage of 3%-7%.

[0014] Preferably, the nano negative ion auxiliary agent in step S3 is a nano rare earth element mixture, with a mass proportion of 0.5%-1%.

[0015] Preferably, the defoaming agent in step S1 is a mixture of a polyether siloxane copolymer defoaming agent and a silicone defoaming agent, with the mass ratio of the two being 1:1.

[0016] Preferably, the thickener in step S3 is hydroxyethyl cellulose or polyacrylate, with a mass percentage of 0.2%-0.5%.

[0017] Preferably, the mass proportion of the film-forming aid is 1-1.3%; the pH adjuster is one or more of amines or multifunctional additives, with a mass proportion of 0.1-0.3%; the mass proportion of deionized water is 20-30%; the wetting agent is a polyether-modified polysiloxane wetting agent, with a mass proportion of 0.1-0.5%; the dispersant is a polyester-modified polyphosphate dispersant, with a mass proportion of 0.2-0.4%; and the mass proportion of the leveling agent is 0.2-0.5%.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention uses a biodegradable natural plant-based resin emulsion as the main film-forming material, which is derived from plants, seeds and agricultural waste. The product itself contains more than 50% plant-based materials and has the characteristics of being VOC-free and low in toxicity. At the same time, the high-performance plant-based monomer polymer converted and polymerized from plant-based raw materials also has slow biodegradability. The resin uses renewable plant resources to replace the petroleum resources in the original coating, does not intentionally add any banned or restricted harmful substances, has low odor, low VOC, and high performance. The coating product made with this resin emulsion is non-degradable when the coating film is intact and under normal conditions (no continuous high temperature and contact with water), and its performance will not decline over time during use;

[0020] When the paint film or product is discarded, the damaged part of the paint film will be exposed to sunlight and rain. Under the high temperature, high humidity environment and continuous stimulation of microorganisms, the degradation rate of the plant-based resin itself will be accelerated. The bio-based additives and plant essences will form a good biodegradation system to accelerate the decomposition of the film-forming substances in the paint film into CO2 and water, reducing pollution to the environmental system.

[0021] 2. The biodegradable natural plant-based resin emulsion of the present invention reuses agricultural waste to replace the petroleum resources in the original coating, reducing the carbon footprint of the coating from the source, avoiding the air pollution directly caused by incineration, and not conflicting with food production and sustainable forest resources. Using a full life cycle approach to analyze the environmental impact of the product, the carbon footprint of the product was reduced by 34%, and greenhouse gas emissions were reduced by 0.06-0.1 kg per kilogram of coating.

[0022] 3. The film-forming aid of the present invention does not contain VOC and is odorless. It can significantly reduce the minimum film-forming temperature of the coating, and can also improve the cohesion, weather resistance, scrub resistance and color development of the latex paint, while having good storage stability.

[0023] 4. The plant extract of the present invention has a broad-spectrum antibacterial effect and has a strong inhibitory effect on bacteria, molds and yeasts. Among them, it has a stronger inhibitory effect on bacteria, such as Salmonella typhi, Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Proteus and Bacillus thuringiensis. The inhibitory effect is stronger and increases with the extension of the action time and the increase of the extract concentration. The light bamboo leaf extract is a natural product extracted from the dried stems and leaves of the grass plant light bamboo leaf, and has a soothing and pleasant friendly smell.

[0024] 5. This invention utilizes nano-grade titanium dioxide to impart certain bactericidal, antifouling, deodorizing, and self-cleaning properties to the coating. Suitable for use in places where bacteria are dense and easily multiplied, such as hospital wards, operating rooms, and home bathrooms, it purifies the air, prevents infection, and removes odors. It effectively kills harmful bacteria. When combined with a long-lasting antifungal agent, the coating exhibits a long-lasting and stable bactericidal and antimicrobial effect.

[0025] 6. The zeolite of the present invention is a 400-mesh, white, uniform silver-loaded zeolite powder. This white, silver-loaded zeolite powder has a significant inhibitory effect on a variety of bacteria, including Escherichia coli, Staphylococcus aureus, and Candida albicans. This inhibitory effect is achieved primarily through two pathways: first, the microporous structure of the zeolite powder can destroy bacterial cell membranes, leading to the leakage of intracellular substances, thereby achieving a bactericidal effect; second, the zeolite powder can absorb nutrients required for bacterial growth, thereby inhibiting bacterial growth; and third, the silver ions in the silver-containing zeolite are in an electronically unstable state and have strong oxidizing power, capable of destroying bacterial cells. Silver ions, as free radicals, attempt to capture electrons from bacterial cells, thus exerting an antibacterial effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] A method for preparing a plant-based interior wall coating, see Figure 1 , including the following steps:

[0029] S1. Mix deionized water, antifungal agent, dispersant and defoamer and stir evenly;

[0030] S2, adding titanium dioxide, functional fillers and fillers, and dispersing them at high speed under vacuum until the particle size is less than 50 microns;

[0031] S3. Add plant-based resin emulsion, water-based synthetic resin emulsion, film-forming aid, wetting agent, leveling agent, nano negative ion aid, extract, pH adjuster and thickener, stir evenly to prepare plant-based interior wall paint.

[0032] For details, see Figure 1 The extract in step S1 is a mixture of light bamboo leaf extract, wormwood extract and lemon essential oil, and the mass proportion of the extract is 2.5%-6%.

[0033] For more details, see Figure 1 The titanium dioxide in step S2 is the nano-grade ultrafine rutile titanium dioxide of the Longbai Group Xuelian brand, with a particle size of 10-100 nanometers and a mass proportion of 15%-30%.

[0034] For further information, see Figure 1 The mass proportion of the plant-based resin emulsion in step S3 is 10%-30%, the water-based synthetic resin emulsion is vinyl acetate-acrylate copolymer emulsion, the solid content is 50%-54%, and the minimum film-forming temperature is 0°C.

[0035] Further, see Figure 1 The filler in step S2 includes one or more of calcined kaolin, diatomaceous earth and heavy calcium carbonate, with a total mass proportion of 15%-20%.

[0036] It is worth noting that, see Figure 1 The functional filler in step S2 is zeolite powder, and the zeolite powder is 200-400 mesh silver-loaded zeolite powder, accounting for 3%-7% by mass.

[0037] It is worth noting that see Figure 1 The nano negative ion additive in step S3 is a mixture of nano rare earth elements, with a mass ratio of 0.5%-1%.

[0038] It is worth mentioning that see Figure 1 The defoaming agent in step S1 is a mixture of a polyether siloxane copolymer defoaming agent and a silicone defoaming agent, such as TEGO's defoaming agent Tego-902w and a silicone defoaming agent, such as BYK's defoaming agent BYK-028, with a ratio of about 1:1.

[0039] It is worth noting that, see Figure 1 The thickener in step S3 is hydroxyethyl cellulose or polyacrylate, with a mass ratio of 0.2% to 0.5%.

[0040] It is worth emphasizing that see Figure 1 , the mass proportion of film-forming aid is 1-1.3%; the pH adjuster is one or more amines or multifunctional additives, the mass proportion is 0.1-0.3%; the mass proportion of deionized water is 20-30%; the wetting agent is a polyether modified polysiloxane wetting agent, the mass proportion is 0.1-0.5%; the dispersant is a polyester modified polyphosphate dispersant, the mass proportion is 0.2-0.4%; the mass proportion of leveling agent is 0.2-0.5%.

[0041] It is worth noting that, see Figure 1 The anti-mildew fungicide is one or more of the American TROY non-toxic, long-acting and enhanced fungicides.

[0042] Example 1

[0043] Formula composition (mass ratio):

[0044] Deionized water: 30%

[0045] Plant-based resin emulsion: 10%

[0046] Water-based synthetic resin emulsion: 3%

[0047] Titanium dioxide (ordinary rutile type, non-nano grade): 15%

[0048] Film-forming aid: 1%

[0049] Calcined kaolin: 15%

[0050] Zeolite powder (ordinary, not loaded with silver): 3%

[0051] pH regulator: 0.1%

[0052] Bamboo leaf extract: 2.5%

[0053] Wetting agent: 0.1%

[0054] Defoaming agent: 0.2%

[0055] Dispersant: 0.2%

[0056] Leveling agent: 0.2%

[0057] Negative ion additive: 0.5%

[0058] Thickener: 0.2%

[0059] Features:

[0060] Plant-based resin emulsion has the lowest content, poor environmental protection and weak film-forming performance.

[0061] Ordinary titanium dioxide lacks sterilization and self-cleaning functions.

[0062] Zeolite powder does not carry silver and has limited antibacterial effect.

[0063] The ratio of light bamboo leaf extract is the lowest, and its antibacterial and odor-relieving functions are insufficient.

[0064] The content of each additive is taken to the lowest value, which may easily lead to problems such as uneven dispersion and foaming.

[0065] Example 2

[0066] Formula composition (mass ratio):

[0067] Deionized water: 25%

[0068] Plant-based resin emulsion: 20%

[0069] Water-based synthetic resin emulsion: 6%

[0070] Titanium dioxide (nano-grade rutile): 20%

[0071] Coalescing aid: 1.2%

[0072] Calcined kaolin: 18%

[0073] Zeolite powder (silver-loaded, 300 mesh): 5%

[0074] pH regulator: 0.2%

[0075] Light bamboo leaf extract: 4%

[0076] Wetting agent: 0.3%

[0077] Defoaming agent: 0.3%

[0078] Dispersant: 0.3%

[0079] Leveling agent: 0.3%

[0080] Negative ion additive: 0.8%

[0081] Thickener: 0.3%

[0082] Features:

[0083] The proportion of plant-based resin emulsion is moderate, and environmental protection is improved.

[0084] Nano-grade titanium dioxide provides basic sterilization and self-cleaning functions.

[0085] Silver-loaded zeolite powder enhances antibacterial effects, but its mesh size is relatively low (300 mesh) and its adsorption capacity is limited. Bamboo leaf extract has a moderate concentration and exhibits significant antibacterial and odor-reducing effects.

[0086] The ratio of additives is balanced and the coating performance is stable, but the optimal synergistic effect is not achieved.

[0087] Example 3

[0088] Formula composition (mass ratio):

[0089] Deionized water: 20%

[0090] Plant-based resin emulsion: 30%

[0091] Water-based synthetic resin emulsion: 10%

[0092] Titanium dioxide (nano-grade rutile type, particle size 50nm): 30%

[0093] Coalescing aid: 1.3%

[0094] Calcined kaolin + diatomaceous earth: 20% (15% calcined kaolin + 5% diatomaceous earth)

[0095] Zeolite powder (silver loaded, 400 mesh): 7%

[0096] pH regulator: 0.3%

[0097] Bamboo leaf extract + mugwort extract + lemon essential oil: 6% (4% bamboo leaf + 1% mugwort + 1% lemon) Wetting agent: 0.5%

[0098] Defoamer (polyether siloxane + silicone, 1:1): 0.5%

[0099] Dispersant: 0.4%

[0100] Leveling agent: 0.5%

[0101] Negative ion additive (nano rare earth mixture): 1%

[0102] Thickener (hydroxyethyl cellulose): 0.5%

[0103] Features:

[0104] Plant-based resin emulsion has the highest content, is extremely environmentally friendly, and has excellent degradation performance.

[0105] Nano titanium dioxide (50nm) provides powerful sterilization, self-cleaning and air purification functions.

[0106] High-mesh (400 mesh) silver-loaded zeolite powder has a dual antibacterial mechanism (adsorption + silver ion oxidation). A compound plant extract (light bamboo leaf + wormwood + lemon) provides broad-spectrum antibacterial and a fresh scent.

[0107] The additive ratio is optimized to ensure good dispersion, leveling and storage stability.

[0108] The negative ion additive has a high content and continuously releases negative ions to improve indoor air quality. The specific comparison data is as follows:

[0109]

[0110]

[0111] Summarize:

[0112] Example 1: Basic formula, insufficient performance, suitable for low-cost and low-requirement scenarios.

[0113] Example 2: Balanced formula to meet general environmental protection and antibacterial requirements.

[0114] Example 3: High-end formula, maximizing environmental protection, antibacterial properties and functionality, suitable for high-requirement places such as hospitals and children's rooms.

[0115] In addition, the components designed in the present invention are all universal standard parts or components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. They can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to internal structures and methods.

[0116] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A method for preparing a plant-based interior wall coating, characterized in that: The following steps are involved: S1. Mix deionized water, antifungal agent, dispersant and defoamer and stir evenly; S2, adding titanium dioxide, functional fillers and fillers, and dispersing them at high speed under vacuum until the particle size is less than 50 microns; S3. Add plant-based resin emulsion, water-based synthetic resin emulsion, film-forming aid, wetting agent, leveling agent, nano negative ion aid, extract, pH regulator and thickener, stir evenly to prepare the plant-based interior wall paint.

2. The method for preparing the plant-based interior wall coating according to claim 1, wherein: The extract in step S1 is a mixture of a light bamboo leaf extract, an artemisia annua extract and lemon essential oil, and the weight proportion of the extract is 2.5%-6%.

3. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The titanium dioxide in step S2 is nano-grade rutile titanium dioxide with a particle size of 10-100 nanometers and a mass ratio of 15%-30%.

4. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The mass proportion of the plant-based resin emulsion in step S3 is 10%-30%, and the aqueous synthetic resin emulsion is a vinyl acetate-acrylate copolymer emulsion with a solid content of 50%-54% and a minimum film-forming temperature of 0°C.

5. The method for preparing the plant-based interior wall coating according to claim 1, characterized in that: The filler in step S2 includes one or more of calcined kaolin, diatomaceous earth and heavy calcium carbonate, with a total mass proportion of 15%-20%.

6. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The functional filler in step S2 is zeolite powder, which is 200-400 mesh silver-loaded zeolite powder, accounting for 3%-7% by mass.

7. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The nano negative ion auxiliary agent in step S3 is a mixture of nano rare earth elements, with a mass ratio of 0.5% to 1%.

8. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The defoaming agent in step S1 is a mixture of a polyether siloxane copolymer defoaming agent and a silicone defoaming agent, with the mass ratio of the two being 1:

1.

9. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The thickener in step S3 is hydroxyethyl cellulose or polyacrylate, with a mass percentage of 0.2%-0.5%.

10. The method for preparing the plant-based interior wall paint according to claim 1, characterized in that: The film-forming aid accounts for 1-1.3% by mass and does not contain VOC; the pH adjuster is one or more amines or multifunctional additives, accounting for 0.1-0.3% by mass; the deionized water accounts for 20-30% by mass; the wetting agent is a polyether-modified polysiloxane wetting agent, accounting for 0.1-0.5% by mass; the dispersant is a polyester-modified polyphosphate dispersant, accounting for 0.2-0.4% by mass; and the leveling agent accounts for 0.2-0.5% by mass.

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