Multifunctional composite jade paint as well as preparation method and application thereof

Abstract

The invention relates to multifunctional composite jade paint as well as a preparation method and application thereof. The water-based antibacterial coating is prepared from the following components in parts by weight: 40 to 60 parts of Hetian jade micro powder, 10 to 20 parts of colored quartz sand, 5 to 10 parts of modified nano silicon dioxide, 25 to 35 parts of water-based polyurethane emulsion, 3 to 6 parts of composite antibacterial agent, 1.5 to 3 parts of plant-based dispersing agent, 0.8 to 1.5 parts of organic silicon defoaming agent, 0.5 to 1.2 parts of cellulose ether thickening agent, 2 to 4 parts of coalescing agent and 15 to 25 parts of deionized water. The Hetian jade micro powder is 3000-8000-mesh micro powder obtained by crushing Hetian white jade, performing low-temperature calcination, performing gradient ball milling and then performing screening, and the composite antibacterial agent is a compound of nano-silver ions and bamboo charcoal powder according to the mass ratio of 1: (3-5). Through core component innovation and process optimization, the functions of negative ion release, antibiosis, formaldehyde purification, fire prevention, scrubbing resistance and the like are synergistically improved, and meanwhile, the stability and the environmental protection property of the product are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a multifunctional composite jade paint and its preparation method and application, which is particularly suitable for architectural decoration scenarios with high requirements for environmental performance, functional diversity and decorative effect. Background Technology

[0002] Jade-like paint, due to the addition of natural jade powder, combines decorative properties with certain environmental performance, making it a popular product in the architectural coatings industry. However, current technologies for preparing jade-like paint often involve simply mixing jade powder with conventional coating components, resulting in the following technical drawbacks: First, its function is limited, with most focusing only on negative ion release or basic decorative properties, lacking comprehensive functions such as antibacterial, formaldehyde purification, and fire resistance. Second, jade powder has poor dispersibility, easily agglomerating and leading to insufficient paint film smoothness and poor scrub resistance. Third, its environmental friendliness is limited, with some products using solvent-based emulsions or additives containing heavy metals, resulting in excessive VOC content. Fourth, its stability is insufficient, easily leading to problems such as powdering, discoloration, and cracking after long-term use.

[0003] For example, authorized patent ZL201210531761.0 discloses a negative ion jade paint, which can release negative ions, but its antibacterial properties and formaldehyde adsorption effect are not mentioned; CN102643562B discloses an antibacterial latex paint containing natural jade powder, but the jade powder particle size is only 3000-6000 mesh, the dispersion uniformity is poor, and the fire resistance is not improved. Therefore, developing a jade paint product that combines high environmental protection, multifunctionality, and strong stability has become a technical problem that the industry urgently needs to solve. Summary of the Invention

[0004] To address the technical shortcomings of existing jade paints, such as limited functionality, poor dispersibility, insufficient environmental friendliness, and poor stability, this invention provides a multifunctional composite jade paint, its preparation method, and its application. Through core component innovation and process optimization, it achieves a synergistic improvement in functions such as negative ion release, antibacterial properties, formaldehyde purification, fire resistance, and scrub resistance, while ensuring product stability and environmental friendliness.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a multifunctional composite jade paint, characterized in that, by weight, it comprises the following components: 40-60 parts of Hetian jade micro powder, 10-20 parts of colored quartz sand, 5-10 parts of modified nano-silica, 25-35 parts of water-based polyurethane emulsion, 3-6 parts of composite antibacterial agent, 1.5-3 parts of plant-based dispersant, 0.8-1.5 parts of organosilicon defoamer, 0.5-1.2 parts of cellulose ether thickener, 2-4 parts of film-forming aid, and 15-25 parts of deionized water; wherein the Hetian jade micro powder is 3000-8000 mesh micro powder obtained by crushing, low-temperature calcining, and gradient ball milling of Hetian white jade, with a specific surface area of ​​8-12 m² / g; and the composite antibacterial agent is a compound of nano-silver ions and bamboo charcoal powder in a mass ratio of 1:(3-5).

[0006] The Hetian white jade mentioned therein can be any type of natural Hetian white jade commonly used in this field. The embodiments of this invention use Hetian white jade waste supplied by Kunlun Mountain Mining Co., Ltd. of the 14th Agricultural Division of Xinjiang Production and Construction Corps, which mainly consists of scraps, fragments, and offcuts generated during mining, cutting, and processing.

[0007] The preferred temperature for the low-temperature calcination is 500-600℃, and the preferred time is 1-2 hours.

[0008] The Hetian jade micro powder is preferably prepared by the following method: Hetian white jade is crushed to a particle size ≤5mm, placed in a calcining furnace and calcined at 500-600℃ for 1-2 hours, cooled and then subjected to coarse grinding (particle size ≤100μm), fine grinding (particle size ≤50μm), and ultra-micro ball milling (3000-8000 mesh) in sequence, and screened to obtain 3000-8000 mesh Hetian jade micro powder.

[0009] The modified nano-silica is preferably prepared by the following method: nano-silica is added to an ethanol aqueous solution, ultrasonically dispersed for 30-40 min, silane coupling agent KH-550 is added, and the mixture is stirred and reacted at 70-80℃ for 2-3 h. After filtration and drying, the modified nano-silica product is obtained, with a surface hydroxylation rate ≥80%. The amount of silane coupling agent KH-550 used is 3-5% of the mass of the nano-silica. This invention improves the dispersibility of nano-silica through modification with silane coupling agent KH-550, enabling it to form a stable three-dimensional network structure with Hetian jade micropowder and polyurethane emulsion, significantly improving the scrub resistance and mechanical strength of the paint film, while also enhancing its fire-retardant effect.

[0010] Among them, the preferred colored quartz sand is the 1250 mesh high-purity colored quartz sand powder with a silica content of ≥99% supplied by Jiangsu Donghai County Hongda Quartz Materials Co., Ltd.

[0011] The composite antibacterial agent of this invention is a combination of nano-silver ions and bamboo charcoal powder. Nano-silver ions possess highly efficient antibacterial properties, while bamboo charcoal powder acts as an adsorbent and slow-release agent, prolonging the antibacterial effect and avoiding the problem of single antibacterial agents easily becoming ineffective. Furthermore, it is free of heavy metals, making it more environmentally friendly. Preferably, the nano-silver ions are the LY-2000 general-purpose high-activity nano-silver antibacterial stock solution supplied by Shenzhen Tsinghua Yuanxing Nanomedicine Technology Co., Ltd., and the bamboo charcoal powder is preferably the 2000-mesh ultrafine bamboo charcoal powder supplied by Zhejiang Ruya High-Tech New Materials Co., Ltd.

[0012] The waterborne polyurethane emulsion is a low-VOC environmentally friendly emulsion. Compared with styrene-acrylic emulsion and acrylic emulsion, it has better film-forming properties and better compatibility with fillers, which can improve the flexibility and aging resistance of the coating film, while meeting environmental protection standards.

[0013] Among them, the preferred plant-based dispersant is Solsperse 27000, a water-based bio-based dispersant supplied by Lubrizol Specialty Chemicals (Shanghai) Co., Ltd.

[0014] The preferred type of silicone defoamer is type 1050 silicone defoamer.

[0015] Among them, the preferred film-forming aid is Eastman's TEXANOL ester twelve.

[0016] This invention also provides a method for preparing the above-mentioned multifunctional composite jade paint, which includes the following steps: (1) Raw material pretreatment: Crush Hetian white jade blocks to a particle size ≤5mm, place them in a calcining furnace and calcine at 500-600℃ for 1-2h, and after cooling, grind them sequentially by coarse grinding (particle size ≤100μm), fine grinding (particle size ≤50μm), and ultra-micro ball milling (3000-8000 mesh) to obtain 3000-8000 mesh Hetian jade micro powder; prepare modified nano silica and composite antibacterial agent according to the proportion for later use; (2) Preparation of pre-dispersion system: Add plant-based dispersant and organosilicon defoamer to deionized water, stir at 800-1000 r / min for 15 min, then slowly add Hetian jade micro powder and modified nano silica, heat to 40-50℃, increase the speed to 1500-2000 r / min, disperse at high speed for 30-40 min to form a uniform pre-dispersion liquid; (3) In-situ composite reaction: Add composite antibacterial agent to pre-dispersion liquid, maintain temperature at 40-50℃, stir reaction at 1200-1500r / min for 60-90min to achieve in-situ composite of antibacterial component and jade micro powder; (4) Grinding and refining: Transfer the above system into a vacuum grinder and grind it for 2-3 hours under a vacuum of -0.06~-0.08MPa, controlling the fineness of the material to ≤30μm; (5) Paint preparation and molding: Cool down to room temperature, add water-based polyurethane emulsion, film-forming aid and cellulose ether thickener in sequence, stir at low speed for 20-30 minutes at 600-800 r / min, adjust the viscosity of the system to 28-32 s of Fort-4 cup, and filter through a 200 mesh filter to obtain multifunctional composite jade paint.

[0017] In step (4), the grinding process preferably adopts a three-stage grinding process: the first-stage grinding gap is 0.1 mm, the second-stage grinding gap is 0.05 mm, and the third-stage grinding gap is 0.02 mm. The material is dispersed evenly by refining the grinding process step by step.

[0018] This invention also provides the application of the above-mentioned multifunctional composite jade paint in the fields of interior and exterior wall decoration and protection.

[0019] The application methods for this multifunctional composite jade paint include brushing, roller coating, or airless spraying. Environmental requirements include: substrate moisture ≤8%, pH ≤9, ambient temperature 10-35℃, and relative humidity 40%-65%. The thickness for interior walls is 0.2-0.3mm (applied in two coats, with a 6-hour interval between the first and second coats), and the thickness for exterior walls is 0.3-0.5mm (applied in three coats, with a 6-hour interval between each coat, including the primer).

[0020] This invention employs an innovative process of "gradient grinding - in-situ compounding - staged paint mixing" to prepare multifunctional composite jade paint: (1) The combination of gradient ball milling and low-temperature calcination ensures both the fineness and specific surface area of ​​Hetian jade powder and avoids high temperature damage to its mineral activity, thus ensuring the negative ion release performance. (2) The in-situ composite reaction enables the antibacterial agent to form a stable bond with the jade micro powder and modified nano silica, avoiding the aggregation or loss of antibacterial components and improving the long-lasting antibacterial effect; (3) The three-stage vacuum grinding process effectively solves the problem of uneven dispersion of jade powder, controls the fineness of the material to ≤30μm, and ensures the smoothness of the paint film; (4) The stirring speed and temperature are controlled in stages to avoid reaction conflicts between components and improve product stability.

[0021] The multifunctional composite jade paint of this invention has the beneficial effect of multifunctional synergy, as follows: (1) The jade paint product of the present invention has the comprehensive properties of high negative ion release (≥1200 ions / cm³), formaldehyde adsorption rate ≥85%, scrubbing resistance ≥15000 times, Class A fireproof and long-lasting antibacterial (bacteriostatic rate ≥99%), which solves the pain point of the single function of existing products. (2) Excellent stability: Through component modification and process optimization, the jade powder is evenly dispersed, the paint film is free of agglomeration and pinholes, and it does not peel, change color or crack after long-term use (≥15 years); (3) Excellent environmental performance: It uses environmentally friendly emulsions and plant-based additives, with a VOC content of ≤10g / L, which is far lower than the minimum limit of ≤80g / L for interior wall coatings and ≤100g / L for exterior wall coatings in GB18582-2020 "Limits of Hazardous Substances in Building Wall Coatings" and the minimum limit of ≤50g / L for interior wall coatings and ≤80g / L for exterior wall coatings in GB 30981.1-2025 "Limits of Hazardous Substances in Coatings Part 1 Building Coatings" and has no irritating odor; (4) Controllable process: The preparation process does not require special equipment. The vacuum grinding and staged stirring process is simple and easy to implement, suitable for industrial production, and the production cost is 10-15% lower than that of similar high-end products; (5) Wide range of applications: It is suitable for a variety of building scenarios, especially for places such as hospitals and schools that have strict requirements for environmental protection and antibacterial properties. It is also suitable for interior and exterior wall coating decoration of cultural and tourism buildings that pursue a warm and jade-like decorative effect. It has broad application prospects. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0023] The raw materials used in the embodiments of the present invention are sourced from the following sources: The Hetian white jade is Hetian white jade waste supplied by Kunlunshan Mining Co., Ltd. of the 14th Agricultural Division of Xinjiang Production and Construction Corps. It mainly consists of scraps, fragments, and offcuts generated during mining, cutting, and processing.

[0024] The colored quartz sand is 1250 mesh high-purity colored quartz sand powder with a silica content of ≥99%, supplied by Jiangsu Donghai County Hongda Quartz Materials Co., Ltd.

[0025] The plant-based dispersant is Solsperse 27000, a water-based bio-based dispersant supplied by Lubrizol Specialty Chemicals (Shanghai) Co., Ltd.

[0026] The silicone defoamer is type 1050 silicone defoamer.

[0027] The film-forming aid is Eastman's TEXANOL ester twelve.

[0028] The nano-silver ions are supplied by Shenzhen Tsinghua Yuanxing Nanomedicine Technology Co., Ltd. as the LY-2000 general-purpose high-activity nano-silver antibacterial stock solution.

[0029] The bamboo charcoal powder is 2000 mesh ultrafine bamboo charcoal powder supplied by Zhejiang Ruya High-Tech New Materials Co., Ltd.

[0030] Example 1 A multifunctional composite jade paint, by weight, comprises the following components: 45 parts natural Hetian jade micro powder, 12 parts colored quartz sand, 7 parts modified nano silica, 30 parts water-based polyurethane emulsion, 4 parts composite antibacterial agent [nano silver ions: bamboo charcoal powder = 1:4 (mass ratio)], 2 parts plant-based dispersant, 1 part organosilicon defoamer, 0.8 parts cellulose ether thickener, 3 parts film-forming aid, and 20 parts deionized water.

[0031] Preparation method: (1) Raw material pretreatment: Hetian jade blocks are crushed to ≤5mm, calcined at 550℃ for 2h, and then ultra-fine ball milled to 5000 mesh after coarse grinding and fine grinding to obtain Hetian jade micro powder; nano silica is modified with silane coupling agent KH-550 (the amount is 4% of the mass of nano silica) for later use; (2) Preparation of pre-dispersion system: Add plant-based dispersant and defoamer to deionized water, stir at 900 r / min for 15 min, add Hetian jade micro powder and modified nano silica, disperse at 1800 r / min at 45℃ for 35 min; (3) In-situ composite reaction: Add composite antibacterial agent and stir at 1300 r / min at 45℃ for 60 min; (4) Vacuum grinding: Transfer to a vacuum grinder and grind in three stages under a vacuum of -0.07MPa (with gaps of 0.1mm, 0.05mm and 0.02mm respectively). The total grinding time is 2.5h, and the fineness is controlled to be ≤30μm. (5) Paint preparation and molding: Cool to room temperature, add emulsion, film-forming aid and thickener, stir at 700 r / min for 25 min, adjust the viscosity to 30 s (Ford-4 cup), filter with a 200 mesh screen to obtain the finished product.

[0032] Performance testing: negative ion release of 1350 ions / cm³, formaldehyde adsorption rate of 88%, scrub resistance of 16200 cycles, antibacterial rate against E. coli of 99.3%, VOC content of 7.4g / L, fire rating of Class A, meeting design requirements.

[0033] Example 2 A multifunctional composite jade paint, by weight, comprises the following components: 50 parts natural Hetian jade micro powder, 15 parts colored quartz sand, 8 parts modified nano silica, 32 parts waterborne polyurethane emulsion, 5 parts composite antibacterial agent [nano silver ions: bamboo charcoal powder = 1:5 (mass ratio)], 2.5 parts plant-based dispersant, 1.2 parts organosilicon defoamer, 1.0 part cellulose ether thickener, 3.5 parts film-forming aid, and 22 parts deionized water.

[0034] The preparation method is the same as in Example 1, except that the Hetian jade micro powder is ball-milled to 6000 mesh and vacuum-milled for 3 hours.

[0035] Performance testing: negative ion release of 1420 ions / cm³, formaldehyde adsorption rate of 90%, scrub resistance of 17500 cycles, antibacterial rate against Staphylococcus aureus of 99.5%, VOC content of 7.8g / L, fire rating of Class A, performance is superior to Example 1.

[0036] Example 3 A multifunctional composite jade paint, by weight, comprises the following components: 40 parts natural Hetian jade micro powder, 15 parts colored quartz sand, 6 parts modified nano silica, 28 parts waterborne polyurethane emulsion, 3 parts composite antibacterial agent [nano silver ions: bamboo charcoal powder = 1:3 (mass ratio)], 1.8 parts plant-based dispersant, 0.9 parts organosilicon defoamer, 0.6 parts cellulose ether thickener, 2.5 parts film-forming aid, and 18 parts deionized water.

[0037] The preparation method is the same as in Example 1, except that the Hetian jade micro powder is ball-milled to 4000 mesh and vacuum-milled for 2 hours.

[0038] Performance testing: negative ion release of 1280 ions / cm³, formaldehyde adsorption rate of 86%, scrub resistance of 15800 cycles, antibacterial rate of 99.1%, VOC content of 9.1g / L, fire rating of Class A, meeting the usage requirements.

[0039] Comparative test The performance of the negative ion jade paint (control group 1) of existing authorized patent ZL201210531761.0 and the antibacterial latex paint (control group 2) of CN102643562B were compared with the product of Example 2 of the present invention. The results are shown in the table below: The comparison results show that the product of this invention is significantly superior to existing technology products in terms of negative ion release, formaldehyde adsorption rate, scrub resistance, antibacterial rate, fire resistance and environmental friendliness, demonstrating outstanding substantive features and significant progress.

[0040] Application Examples The multifunctional composite jade paint of Embodiment 2 of the present invention was applied to the interior wall decoration of a high-end medical building: Construction method: airless spraying. After the base layer is treated, apply one coat of special primer. After an interval of 24 hours, apply two coats of the jade paint of this invention, with a total thickness of 0.4mm. Construction environment: temperature 25℃, relative humidity 55%, substrate moisture 6%, pH=8.5; Results: The paint film is smooth and even, exhibiting a warm and lustrous texture, with no irritating odor; after 6 months of use, the indoor formaldehyde concentration is ≤0.03mg / m³, the negative ion concentration remains above 1200 ions / cm³, there is no mold or powdering, and the antibacterial performance remains effective, meeting the stringent requirements of medical buildings.

Claims

1. A multifunctional composite jade paint, characterized in that, The product comprises the following components by weight: 40-60 parts of Hetian jade micro powder, 10-20 parts of colored quartz sand, 5-10 parts of modified nano silica, 25-35 parts of waterborne polyurethane emulsion, 3-6 parts of composite antibacterial agent, 1.5-3 parts of plant-based dispersant, 0.8-1.5 parts of organosilicon defoamer, 0.5-1.2 parts of cellulose ether thickener, 2-4 parts of film-forming aid, and 15-25 parts of deionized water; the Hetian jade micro powder is 3000-8000 mesh micro powder obtained by crushing, low-temperature calcining, and gradient ball milling of Hetian white jade, with a specific surface area of ​​8-12 m² / g; the composite antibacterial agent is a compound of nano silver ions and bamboo charcoal powder in a mass ratio of 1:(3-5).

2. The multifunctional composite jade paint as described in claim 1, characterized in that, The low-temperature calcination is carried out at a temperature of 500-600℃ for 1-2 hours.

3. The multifunctional composite jade paint as described in claim 1, characterized in that, The Hetian jade micro powder is preferably prepared by the following method: Hetian white jade is crushed to a particle size ≤5mm, placed in a calcining furnace and calcined at 500-600℃ for 1-2 hours, cooled, and then subjected to coarse grinding, fine grinding, and ultra-micro ball milling in sequence, and screened to obtain 3000-8000 mesh Hetian jade micro powder; the coarse grinding is to a particle size ≤100μm, the fine grinding is to a particle size ≤50μm, and the ultra-micro ball milling is to a particle size of 3000-8000 mesh.

4. The multifunctional composite jade paint as described in claim 1, characterized in that, The modified nano-silica is prepared by the following method: nano-silica is added to an ethanol aqueous solution, ultrasonically dispersed for 30-40 min, silane coupling agent KH-550 is added, and the mixture is stirred and reacted at 70-80℃ for 2-3 h. After filtration and drying, the modified nano-silica product is obtained, with a surface hydroxylation rate ≥80%. The preferred amount of silane coupling agent KH-550 is 3-5% of the mass of the nano-silica.

5. The multifunctional composite jade paint as described in claim 1, characterized in that, The colored quartz sand mentioned is high-purity colored quartz sand powder with a silica content of ≥99% and a mesh size of 1250 mesh, supplied by Jiangsu Donghai County Hongda Quartz Materials Co., Ltd.

6. A method for preparing a multifunctional composite jade paint as described in any one of claims 1 to 5, characterized in that, It includes the following steps: (1) Raw material pretreatment: Crush Hetian white jade blocks to a particle size ≤5mm, place them in a calcining furnace and calcine at 500-600℃ for 1-2h, and after cooling, grind them sequentially by coarse grinding (particle size ≤100μm), fine grinding (particle size ≤50μm), and ultra-micro ball milling (3000-8000 mesh) to obtain 3000-8000 mesh Hetian jade micro powder; prepare modified nano silica and composite antibacterial agent according to the proportion for later use; (2) Preparation of pre-dispersion system: Add plant-based dispersant and organosilicon defoamer to deionized water, stir at 800-1000 r / min for 15 min, then slowly add Hetian jade micro powder and modified nano silica, heat to 40-50℃, increase the speed to 1500-2000 r / min, disperse at high speed for 30-40 min to form a uniform pre-dispersion liquid; (3) In-situ composite reaction: Add composite antibacterial agent to pre-dispersion liquid, maintain temperature at 40-50℃, stir reaction at 1200-1500r / min for 60-90min to achieve in-situ composite of antibacterial component and jade micro powder; (4) Grinding and refining: Transfer the above system into a vacuum grinder and grind it for 2-3 hours under a vacuum of -0.06~-0.08MPa, controlling the fineness of the material to ≤30μm; (5) Paint preparation and molding: Cool down to room temperature, add water-based polyurethane emulsion, film-forming aid and cellulose ether thickener in sequence, stir at low speed for 20-30 minutes at 600-800 r / min, adjust the viscosity of the system to 28-32 s of Fort-4 cup, and filter through a 200 mesh filter to obtain multifunctional composite jade paint.

7. The preparation method according to claim 6, characterized in that, In step (4), the grinding process preferably adopts a three-stage grinding process: the first-stage grinding gap is 0.1mm, the second-stage grinding gap is 0.05mm, and the third-stage grinding gap is 0.02mm.

8. The application of a multifunctional composite jade paint as described in any one of claims 1 to 5 in the field of interior and exterior wall decoration and protection.

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