An antibacterial drawing board capable of slowly releasing negative ions and its preparation process

Abstract

The present invention relates to the technical field of antibacterial drawing boards, specifically an antibacterial drawing board capable of sustained negative ion release and a preparation process thereof, comprising the following preparation process: taking a substrate, applying mortar to the surface of the substrate, superimposing a mesh cloth on the surface of the mortar, and finally applying a coating on the surface of the mesh cloth to obtain an antibacterial drawing board; the coating comprises the following components: 100 parts of water-based UV coating, 10-15 parts of barium sulfate, 1-5 parts of titanium dioxide, and 150-200 parts of water. The present invention introduces tourmaline, rare earth minerals, silicon dioxide, etc. by setting the ratio of mortar components on the surface of the base cloth, thereby giving the drawing board a high-concentration and long-lasting negative ion sustained release capability; superimposing a mesh cloth on the surface of the mortar, applying the coating on the surface of the mesh cloth, and utilizing surface modification of the titanium dioxide component in the coating to significantly improve the antibacterial capability of the resulting drawing board.

Description

Technical Field

[0001] The present invention relates to the technical field of antibacterial drawing boards, in particular to an antibacterial drawing board capable of slowly releasing negative ions and a preparation process thereof. Background Art

[0002] In recent years, with the booming industrial and urban economies, paintings have become a vital component of architectural decoration. With the rapid development of the decoration industry, the industry's green and environmentally friendly development requirements, and consumers' growing environmental and health awareness, the functionality of drawing boards is constantly evolving. Decorations, daily necessities, human activities, and outdoor pollution can all contribute to indoor air pollution, generating air pollutants and microbial bacteria that can cause health problems. Therefore, we propose an antibacterial drawing board that slowly releases negative ions and its preparation process. Summary of the Invention

[0003] The object of the present invention is to provide an antibacterial drawing board capable of slowly releasing negative ions and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an antibacterial drawing board capable of slowly releasing negative ions, comprising the following structures from top to bottom: a substrate, mortar, mesh cloth, and coating.

[0005] Furthermore, the mortar includes the following components: 55 to 60 parts of heavy calcium carbonate, 12 to 20 parts of silicon dioxide, 4 to 6 parts of graphite, 6 to 20 parts of negative ion materials, 1.5 to 2.0 parts of rubber powder, 0.3 to 0.4 parts of hydroxypropyl methylcellulose, 0.1 to 0.3 parts of lignin fiber, and 33 to 41 parts of water.

[0006] Furthermore, the negative ion material is a mixture of tourmaline powder and rare earth minerals;

[0007] The mass ratio of tourmaline powder and rare earth mineral is (4-6):(3-15);

[0008] Tourmaline powder: particle size 1-10 μm, sourced from Yancheng Mineral Products Processing Plant in Lingshou County;

[0009] Rare earth minerals: particle size 2.7~3.4μm, sourced from Lingshou County Yixuan Mineral Products Processing Plant.

[0010] Furthermore, heavy calcium carbonate: particle size 2000 mesh, sourced from Xinyu Yuxue Calcium Industry Co., Ltd.;

[0011] Silicon dioxide: particle size 400 mesh, sourced from Jinan Lanhai Chemical Co., Ltd.

[0012] Graphite: Nano-scale flake graphite, particle size 2000 mesh, sourced from Qingdao Dongkai Graphite Co., Ltd.

[0013] The rubber powder is redispersible latex powder SMARGO 328, sourced from Tianjin Wacker New Materials Co., Ltd.

[0014] Hydroxypropyl methylcellulose: HPMC, viscosity 100,000 CPS, sourced from Renqiu Jinyu Chemical Co., Ltd.

[0015] Lignin fiber: h500, sourced from Guangzhou Shenchuang Chemical Co., Ltd.

[0016] Furthermore, the thickness of the mortar is 0.5 to 0.8 mm.

[0017] In the above technical solution, the mortar contains a variety of components, including heavy calcium carbonate, silica, graphite, negative ion materials, glue powder, hydroxypropyl methylcellulose and lignin fiber. Among them, heavy calcium carbonate (heavy calcium) can play a synergistic role with wood fiber, which can improve the crack resistance of the drawing board; silica can improve the waterproof performance of the drawing board; nanographite is used to improve the stability of the drawing board; glue powder has adhesiveness and permeability, and can play the role of a binder to improve the crack resistance of the drawing board; and hydroxypropyl methylcellulose is used to increase the viscosity. Under the radiation of natural light or far-infrared light, hole / electron pairs are formed in the tourmaline powder crystals of the negative ion material, and the generated holes (h+) are used to oxidize water molecules to form hydroxyl radicals; or when the Fe in the γ position 2+ Converted to Fe 3+ When oxygen molecules are reduced or reacted with water molecules, they can form oxygen anion free radicals or hydroxyl free radicals. Hydroxyl free radicals can associate with other water molecules to form hydrated hydroxyl ions, achieving the formation and sustained release of negative ions in the drawing board, making the drawing board produce an air purification effect. Rare earth minerals are rare earth salts and oxides. After being combined with tourmaline, they can promote the dispersion of tourmaline and effectively improve the tourmaline's ability to produce negative ions. Rare earth elements have a long half-life and high radiation energy. While promoting the production of high negative ion concentrations, they can also prolong the time the negative ion material produces negative ions, thereby giving the drawing board a high-concentration and long-lasting negative ion sustained-release ability.

[0018] Furthermore, the coating comprises the following components: 100 parts of water-based UV coating, 10 to 15 parts of barium sulfate, 1 to 5 parts of titanium dioxide, and 150 to 200 parts of water.

[0019] Water-based UV coating: MR2404 polyester acrylate, viscosity 300-500mPa.S / 25°C, solid content ≥98%, sourced from Guangdong Keding Functional Materials Co., Ltd.

[0020] Titanium dioxide: ATR312, sourced from Beijing Wanyun Huarui Chemical Co., Ltd.

[0021] Barium sulfate: particle size 3000 mesh, sourced from Gongyi Shengda Micropowder Factory.

[0022] Furthermore, the titanium dioxide is surface modified, and the specific process is as follows:

[0023] Mix titanium dioxide and ethanol, stir and disperse for 15 to 30 minutes, add coupling agent KH-550, stir and react for 30 to 40 minutes; filter, wash, and dry to obtain coupled modified titanium dioxide;

[0024] Dispersing the coupled modified titanium dioxide in deionized water, adding L-tyrosine hydrochloride, L-lysine hydrochloride, and nickel chloride in sequence and mixing evenly, adjusting the pH of the system to 9.7-10.3 with sodium hydroxide, stirring at 45-50 rpm for 100-150 minutes at a temperature of 55-65°C, filtering, washing, and drying to obtain amino acid-modified titanium dioxide;

[0025] The amino acid-modified titanium dioxide is dispersed in deionized water, the pH of the system is adjusted to 8.7-9.3 using sodium hydroxide, dimethyl sulfate is slowly added, the temperature is raised to 38-43°C and the reaction is carried out for 150-200 minutes; the mixture is cooled to room temperature, washed, and dried to obtain quaternary ammonium-modified titanium dioxide;

[0026] The quaternized modified titanium dioxide is dispersed in deionized water, the pH of the system is adjusted to 8.7-9.3 using sodium hydroxide, silver nitrate is slowly added, stirred for 18-25 minutes, and placed under 100W ultraviolet light for 170-230 minutes to obtain modified titanium dioxide.

[0027] Furthermore, the amount of coupling agent kh-550 is 3.5 to 5.0% of the mass of titanium dioxide;

[0028] The ratio of titanium dioxide to ethanol solution is (25-30) g / 100 mL;

[0029] The volume ratio of anhydrous ethanol and deionized water in the ethanol solution is (4.2-4.5):1.

[0030] Furthermore, the ratio of coupled modified titanium dioxide and deionized water is 10-18 g / 100 mL;

[0031] The molar ratio of L-tyrosine hydrochloride 217.6 and L-lysine hydrochloride 182.6 is 1:(0.5-2.0), collectively referred to as amino acid hydrochlorides;

[0032] The ratio of coupling modified titanium dioxide, amino acid hydrochloride, and nickel chloride is 10 g: (0.05-0.10) mol: (0.03-0.06);

[0033] Amino acid hydrochloride is added in the form of a solution, and the concentration of the amino acid hydrochloride solution is 15.8%;

[0034] Nickel chloride is added in the form of a solution, and the concentration of the nickel chloride solution is 14.6%.

[0035] Furthermore, the ratio of amino acid modified titanium dioxide and deionized water is (20-25) g / 100 mL;

[0036] The mass ratio of amino acid modified titanium dioxide and dimethyl sulfate is 10:(6.6-13.3);

[0037] Furthermore, the ratio of quaternized ammonium modified titanium dioxide and deionized water is (12-20) g / 100 mL;

[0038] The mass ratio of quaternized ammonium modified titanium dioxide and silver nitrate is 10:(8.5-16.9);

[0039] Silver nitrate was added in the form of a solution, and the concentration of the silver nitrate solution was 3.4 wt%.

[0040] Furthermore, sodium hydroxide is added in the form of a solution, and the concentration of the sodium hydroxide solution is 4-6 wt %.

[0041] Furthermore, the coating has a thickness of 2 to 4 μm.

[0042] Furthermore, the substrate is a polystyrene plate; the thickness of the substrate is 40 to 60 mm.

[0043] Furthermore, the mesh cloth is an alkali-resistant glass fiber mesh cloth with a gram weight of 80 to 110 g / m 2 , thickness is 0.20~0.35mm, mesh size is 4mm×4mm.

[0044] In the above technical solution, covering the mortar surface with alkali-resistant mesh cloth makes the overall structure of the produced drawing board more stable and prevents cracking. The coating is obtained by mixing water-based UV coating, barium sulfate, titanium dioxide and water. Among them, barium sulfate can be used as a protective material for high-energy rays, achieving the radiation protection effect of the produced drawing board. Titanium dioxide can improve the drawing board's protection against ultraviolet rays, blocking ultraviolet light with a wavelength of 280 to 350nm, and improving the drawing board's anti-ultraviolet aging properties; at the same time, under the action of ultraviolet light, photogenerated electrons and photogenerated holes are formed in titanium dioxide, which can increase the negative ion release rate of tourmaline powder.

[0045] The present application also performs surface modification on titanium dioxide. First, aminosilane coupling agent KH-550 is used to introduce amino groups on the surface of titanium dioxide. Then, the amino groups in the structure of coupling agent KH-550 are used to form chelates with the amino groups and carboxyl groups in tyrosine and lysine and nickel ions. Then, dimethyl sulfate is used to quaternize the remaining amino groups in the lysine molecular structure to obtain quaternized modified titanium dioxide. Phenol in the tyrosine molecular structure is used to in-situ reduce silver ions under light conditions to obtain modified titanium dioxide containing silver sol, which can improve the dispersion performance of titanium dioxide in coatings. Nanosilver in modified titanium dioxide can exert its plasmon characteristics, inhibit the recombination of electron-hole pairs, increase the life of holes, etc., and improve the catalytic ability of titanium dioxide to negative ions. At the same time, the modified silicon dioxide has nanosilver and quaternary ammonium salt structures, so that it can simultaneously play the role of nanosilver and organic antibacterial dual antibacterial agents, significantly improving the antibacterial ability of the prepared drawing board.

[0046] A preparation process of an antibacterial drawing board capable of slowly releasing negative ions includes the following preparation processes:

[0047] A substrate is taken, mortar is applied on the surface of the substrate, a mesh cloth is superimposed on the surface of the mortar, and finally a coating is applied on the surface of the mesh cloth to obtain an antibacterial drawing board.

[0048] Furthermore, after the mesh cloth is superimposed on the mortar surface, it is placed at a temperature of 21 to 25° C. and a relative humidity of 45 to 55% for curing for 1 to 3 days.

[0049] Furthermore, after the coating is applied, light curing is performed, and the process conditions are: 365nm ultraviolet irradiation for 1 to 2 minutes.

[0050] The invention discloses an application of an antibacterial drawing board capable of slowly releasing negative ions, and painting is performed on the surface of the antibacterial drawing board.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The antibacterial drawing board capable of sustained negative ion release of the present invention and its preparation process introduce tourmaline, rare earth minerals, silicon dioxide and the like by setting the mortar component ratio on the surface of the base cloth, thereby giving the drawing board a high-concentration and long-lasting negative ion sustained-release capability; a mesh cloth is superimposed on the surface of the mortar, a coating is applied on the surface of the mesh cloth, and the surface modification of the titanium dioxide component in the coating is utilized to significantly improve the antibacterial capability of the prepared drawing board. DETAILED DESCRIPTION

[0053] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] In the following examples, tourmaline powder: particle size 1-10 μm, sourced from Yancheng Mineral Products Processing Plant in Lingshou County;

[0055] Rare earth minerals: particle size 2.7-3.4 μm, sourced from Lingshou County Yixuan Mineral Products Processing Plant;

[0056] Heavy calcium carbonate: particle size 2000 mesh, sourced from Xinyu Yuxue Calcium Industry Co., Ltd.

[0057] Silicon dioxide: particle size 400 mesh, sourced from Jinan Lanhai Chemical Co., Ltd.

[0058] Graphite: Nano-scale flake graphite, particle size 2000 mesh, sourced from Qingdao Dongkai Graphite Co., Ltd.

[0059] The rubber powder is redispersible latex powder SMARGO 328, sourced from Tianjin Wacker New Materials Co., Ltd.

[0060] Hydroxypropyl methylcellulose: HPMC, viscosity 100,000 CPS, sourced from Renqiu Jinyu Chemical Co., Ltd.

[0061] Lignin fiber: h500, sourced from Guangzhou Shenchuang Chemical Co., Ltd.

[0062] Water-based UV coating: MR2404 polyester acrylate, viscosity 300-500mPa.S / 25°C, solid content ≥98%, sourced from Guangdong Keding Functional Materials Co., Ltd.

[0063] Titanium dioxide: ATR312, sourced from Beijing Wanyun Huarui Chemical Co., Ltd.

[0064] Barium sulfate: particle size 3000 mesh, sourced from Gongyi Shengda Micropowder Factory.

[0065] Example 1: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation processes:

[0066] (1) Preparation of mortar:

[0067] Tourmaline powder and rare earth minerals are mixed in a mass ratio of 4:3 as negative ion materials;

[0068] Add 15g of rubber powder to 330g of water, and then add 550g of heavy calcium carbonate, 120g of silicon dioxide, 40g of graphite, 60g of negative ion material, 3g of hydroxypropyl methylcellulose, and 1g of lignin fiber to prepare mortar;

[0069] (2) Preparation of coating:

[0070] 10 g of titanium dioxide and 40 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.2:1) were mixed and stirred for 15 minutes. 0.35 g of coupling agent KH-550 was added and stirred for 30 minutes. The mixture was filtered, washed, and dried to obtain coupled modified titanium dioxide.

[0071] 10 g of coupled modified titanium dioxide was dispersed in 10 mL of deionized water, and 7.3 g of L-tyrosine hydrochloride, 3.0 g of L-lysine hydrochloride (added in the form of a solution with a concentration of 15.8%), and 3.8 g of nickel chloride (added in the form of a solution with a concentration of 14.6%) were added in sequence and mixed evenly. The pH of the system was adjusted to 9.7 with 4 wt % of sodium hydroxide, and the mixture was stirred at 45 rpm for 100 min at 55° C.; the mixture was filtered, washed, and dried to obtain amino acid-modified titanium dioxide.

[0072] Disperse 10 g of amino acid-modified titanium dioxide in 50 mL of deionized water, adjust the pH of the system to 8.7 with 4 wt % sodium hydroxide, slowly add 6.6 g of dimethyl sulfate, raise the temperature to 38° C. and react for 150 min; cool to room temperature, wash, and dry to obtain quaternized modified titanium dioxide;

[0073] 10 g of quaternized ammonium modified titanium dioxide was dispersed in 50 mL of deionized water, and the pH of the system was adjusted to 8.7 with 4 wt % sodium hydroxide. 8.5 g of silver nitrate (added in the form of a solution with a concentration of 3.4 wt %) was slowly added, stirred for 18 min, and exposed to 100 W ultraviolet light for 170 min to obtain modified titanium dioxide;

[0074] 100 g of water-based UV coating, 10 g of barium sulfate, and 1 g of modified titanium dioxide were dispersed in 150 g of water to obtain a coating;

[0075] (3) Preparation of antibacterial drawing board:

[0076] Take a polystyrene board with a thickness of 50mm as the substrate, and apply mortar on the surface of the substrate with a thickness of 0.6mm; overlay a mesh cloth (alkali-resistant glass fiber mesh cloth, weight 90g / m 2, thickness 0.27mm, mesh size 4mm×4mm), placed at a temperature of 21°C and a relative humidity of 45%, and cured for 1 day; finally, the coating was applied on the surface of the mesh cloth, the coating thickness of the coating was 3μm, and the coating was cured by light. The process conditions were: 365nm ultraviolet irradiation for 1min to obtain an antibacterial drawing board.

[0077] Example 2: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation process:

[0078] (1) Preparation of mortar:

[0079] Tourmaline powder and rare earth minerals are mixed in a mass ratio of 5:9 as negative ion materials;

[0080] Add 18g of rubber powder to 370g of water, and then add 580g of heavy calcium carbonate, 160g of silicon dioxide, 50g of graphite, 130g of negative ion material, 3.5g of hydroxypropyl methylcellulose, and 2g of lignin fiber to prepare mortar;

[0081] (2) Preparation of coating:

[0082] 10 g of titanium dioxide and 36 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.4:1) were mixed and stirred for 22 minutes. 0.42 g of coupling agent KH-550 was added and stirred for 35 minutes. The mixture was filtered, washed, and dried to obtain coupled modified titanium dioxide.

[0083] 10 g of coupled modified titanium dioxide was dispersed in 30 mL of deionized water, and 8.2 g of L-tyrosine hydrochloride, 6.8 g of L-lysine hydrochloride (added in the form of a solution with a concentration of 15.8%), and 5.8 g of nickel chloride (added in the form of a solution with a concentration of 14.6%) were added in sequence and mixed evenly. The pH of the system was adjusted to 10 with 5 wt % of sodium hydroxide, and the mixture was stirred at 48 rpm for 120 min at 60° C.; the mixture was filtered, washed, and dried to obtain amino acid-modified titanium dioxide.

[0084] Disperse 10 g of amino acid-modified titanium dioxide in 45 mL of deionized water, adjust the pH of the system to 9 with 5 wt % sodium hydroxide, slowly add 9.9 g of dimethyl sulfate, raise the temperature to 40° C. and react for 180 min; cool to room temperature, wash, and dry to obtain quaternized modified titanium dioxide;

[0085] 10 g of quaternized modified titanium dioxide was dispersed in 66 mL of deionized water, and the pH of the system was adjusted to 9 using 5 wt % sodium hydroxide. 12.7 g of silver nitrate (added in the form of a solution with a concentration of 3.4 wt %) was slowly added, stirred for 21 min, and exposed to 100 W ultraviolet light for 200 min to obtain modified titanium dioxide.

[0086] 100 g of water-based UV coating, 12 g of barium sulfate, and 3 g of modified titanium dioxide were dispersed in 180 g of water to obtain a coating;

[0087] (3) Preparation of antibacterial drawing board:

[0088] Take a polystyrene board with a thickness of 50mm as the substrate, and apply mortar on the surface of the substrate with a thickness of 0.6mm; overlay a mesh cloth (alkali-resistant glass fiber mesh cloth, weight 90g / m 2 , thickness 0.27mm, mesh size 4mm×4mm), placed at a temperature of 23°C and a relative humidity of 50%, and cured for 2 days; finally, the coating was applied on the surface of the mesh cloth, the coating thickness of the coating was 3μm, and the coating was cured by light, and the process conditions were: 365nm ultraviolet irradiation for 1.5min; and an antibacterial drawing board was obtained.

[0089] Example 3: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation process:

[0090] (1) Preparation of mortar:

[0091] Tourmaline powder and rare earth minerals are mixed in a mass ratio of 6:15 as negative ion materials;

[0092] Add 20g of rubber powder to 410g of water, and then add 600g of heavy calcium carbonate, 200g of silicon dioxide, 60g of graphite, 200g of negative ion material, 4g of hydroxypropyl methylcellulose, 3g of lignin fiber, and 410g of water to prepare a mortar;

[0093] (2) Preparation of coating:

[0094] 10 g of titanium dioxide and 33 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.5:1) were mixed and stirred for 30 minutes. 0.50 g of coupling agent KH-550 was added and stirred for 40 minutes. The mixture was filtered, washed, and dried to obtain coupled modified titanium dioxide.

[0095] 10 g of coupled modified titanium dioxide was dispersed in 55 mL of deionized water, and 7.2 g of L-tyrosine hydrochloride, 12.2 g of L-lysine hydrochloride (added in the form of a solution with a concentration of 15.8%), and 7.8 g of nickel chloride (added in the form of a solution with a concentration of 14.6%) were added in sequence and mixed evenly. The pH of the system was adjusted to 10.3 with 6 wt % of sodium hydroxide, and the mixture was stirred at 50 rpm for 150 min at 65° C.; the mixture was filtered, washed, and dried to obtain amino acid-modified titanium dioxide.

[0096] Disperse 10 g of amino acid-modified titanium dioxide in 40 mL of deionized water, adjust the pH of the system to 9.3 with 6 wt % sodium hydroxide, slowly add 13.3 g of dimethyl sulfate, raise the temperature to 43° C. and react for 200 min; cool to room temperature, wash, and dry to obtain quaternized modified titanium dioxide;

[0097] 10 g of quaternized ammonium modified titanium dioxide was dispersed in 83 mL of deionized water, and the pH of the system was adjusted to 9.3 with 6 wt % sodium hydroxide. 16.9 g of silver nitrate (added in the form of a solution with a concentration of 3.4 wt %) was slowly added, stirred for 25 min, and exposed to 100 W ultraviolet light for 230 min to obtain modified titanium dioxide;

[0098] 100 g of water-based UV coating, 15 g of barium sulfate, and 5 g of modified titanium dioxide were dispersed in 200 g of water to obtain a coating;

[0099] (3) Preparation of antibacterial drawing board:

[0100] Take a polystyrene board with a thickness of 50mm as the substrate, and apply mortar on the surface of the substrate with a thickness of 0.6mm; overlay a mesh cloth (alkali-resistant glass fiber mesh cloth, weight 90g / m 2 , thickness 0.27mm, mesh size 4mm×4mm), placed at a temperature of 25°C and a relative humidity of 55%, and cured for 3 days; finally, the coating was applied on the surface of the mesh cloth, the coating thickness of the coating was 3μm, and the coating was cured by light. The process conditions were: 365nm ultraviolet irradiation for 2min to obtain an antibacterial drawing board.

[0101] Comparative Example 1: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation processes:

[0102] (1) Preparation of mortar:

[0103] Take tourmaline powder as the negative ion material; add 15g of rubber powder to 330g of water, and then add 550g of heavy calcium carbonate, 120g of silicon dioxide, 40g of graphite, 60g of negative ion material, 3g of hydroxypropyl methylcellulose, and 1g of lignin fiber to make mortar;

[0104] Steps (2-3) are the same as those in Example 1 to obtain an antibacterial drawing board.

[0105] Comparative Example 2: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation processes:

[0106] (2) Preparation of coating:

[0107] 10 g of titanium dioxide and 40 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.2:1) were mixed and stirred for 15 minutes. 0.35 g of coupling agent KH-550 was added and stirred for 30 minutes. The mixture was filtered, washed, and dried to obtain coupled modified titanium dioxide.

[0108] 10 g of coupled modified titanium dioxide was dispersed in 10 mL of deionized water, 10.8 g of L-tyrosine hydrochloride (added in the form of a solution with a concentration of 15.8%) and 3.8 g of nickel chloride (added in the form of a solution with a concentration of 14.6%) were added and mixed uniformly. The pH of the system was adjusted to 9.7 with 4 wt % sodium hydroxide, and the mixture was stirred at 45 rpm for 100 min at 55° C.; the mixture was filtered, washed, and dried to obtain amino acid-modified titanium dioxide.

[0109] 10 g of amino acid-modified titanium dioxide was dispersed in 50 mL of deionized water, and the pH of the system was adjusted to 8.7 using 4 wt % sodium hydroxide. 8.5 g of silver nitrate (added in the form of a solution with a concentration of 3.4 wt %) was slowly added, stirred for 18 min, and exposed to 100 W ultraviolet light for 170 min to obtain (nanosilver)-modified titanium dioxide.

[0110] 100 g of water-based UV coating, 10 g of barium sulfate, and 1 g of modified titanium dioxide were dispersed in 150 g of water to obtain a coating;

[0111] Steps (1) and (3) are the same as those in Comparative Example 1 to obtain an antibacterial drawing board.

[0112] Comparative Example 3: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation processes:

[0113] (2) Preparation of coating:

[0114] 10 g of titanium dioxide and 40 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.2:1) were mixed and stirred for 15 minutes. 0.35 g of coupling agent KH-550 was added and stirred for 30 minutes. The mixture was filtered, washed, and dried to obtain coupled modified titanium dioxide.

[0115] 10 g of coupled modified titanium dioxide was dispersed in 10 mL of deionized water, 9.3 g of L-lysine hydrochloride (added in the form of a solution with a concentration of 15.8%) and 3.8 g of nickel chloride (added in the form of a solution with a concentration of 14.6%) were added and mixed uniformly. The pH of the system was adjusted to 9.7 with 4 wt % sodium hydroxide, and the mixture was stirred at 45 rpm for 100 min at 55° C.; the mixture was filtered, washed, and dried to obtain amino acid-modified titanium dioxide.

[0116] Disperse 10 g of amino acid-modified titanium dioxide in 50 mL of deionized water, adjust the pH of the system to 8.7 with 4 wt % sodium hydroxide, slowly add 6.6 g of dimethyl sulfate, raise the temperature to 38° C. and react for 150 min; cool to room temperature, wash, and dry to obtain (quaternized) modified titanium dioxide;

[0117] 100 g of water-based UV coating, 10 g of barium sulfate, and 1 g of modified titanium dioxide were dispersed in 150 g of water to obtain a coating;

[0118] Steps (1) and (3) are the same as those in Comparative Example 1 to obtain an antibacterial drawing board.

[0119] Comparative Example 4: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation processes:

[0120] (2) Preparation of coating:

[0121] 10 g of titanium dioxide and 40 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.2:1) were mixed and stirred for 15 minutes. 0.35 g of coupling agent KH-550 was added and stirred for 30 minutes. The mixture was filtered, washed, and dried to obtain coupled modified titanium dioxide.

[0122] 10 g of coupled modified titanium dioxide was dispersed in 10 mL of deionized water, 9.3 g of L-lysine hydrochloride (added in the form of a solution with a concentration of 15.8%) and 3.8 g of nickel chloride (added in the form of a solution with a concentration of 14.6%) were added and mixed uniformly. The pH of the system was adjusted to 9.7 with 4 wt % sodium hydroxide, and the mixture was stirred at 45 rpm for 100 min at 55° C.; the mixture was filtered, washed, and dried to obtain (amino acid) modified titanium dioxide.

[0123] 100 g of water-based UV coating, 10 g of barium sulfate, and 1 g of modified titanium dioxide were dispersed in 150 g of water to obtain a coating;

[0124] Steps (1) and (3) are the same as those in Comparative Example 1 to obtain an antibacterial drawing board.

[0125] Comparative Example 5: A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, comprising the following preparation processes:

[0126] (2) Preparation of coating:

[0127] 10 g of titanium dioxide and 40 mL of ethanol (a mixture of anhydrous ethanol and deionized water with a volume ratio of 4.2:1) were mixed and stirred for 15 minutes. 0.35 g of coupling agent KH-550 was added and stirred for 30 minutes. The mixture was filtered, washed, and dried to obtain (coupled) modified titanium dioxide.

[0128] 100 g of water-based UV coating, 10 g of barium sulfate, and 1 g of modified titanium dioxide were dispersed in 150 g of water to obtain a coating;

[0129] Steps (1) and (3) are the same as those in Comparative Example 1 to obtain an antibacterial drawing board.

[0130] experiment

[0131] The antibacterial drawing boards obtained in Examples 1-3 and Comparative Examples 1-5 were used to prepare samples, and their properties were tested and the test results were recorded:

[0132] Determination of negative ion release: Use a digital multimeter to test the negative ion release of the sample under the experimental conditions of 22.5℃ and 72%RH. The instrument detection point is 10 cm away from the sample surface.

[0133] Antibacterial performance test: The antibacterial activity of the sample was evaluated using the inhibition zone method with Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus. In the experiment, 200μL of Escherichia coli and Staphylococcus aureus were placed on a solid culture medium and coated with bacterial liquid. A circular sample with a diameter of 10cm was exposed to ultraviolet light for 15 minutes, placed on the surface of the culture medium, and incubated at 37°C for 24 hours.

[0134]

[0135] According to the data in the above table, we can clearly draw the following conclusions:

[0136] The antibacterial drawing boards obtained in Examples 1-3 were compared with the antibacterial drawing boards obtained in Comparative Examples 1-5. The test results show that:

[0137] Compared with the comparative example, the antibacterial drawing boards obtained in Examples 1-3 have higher negative ion release and inhibition zone data, which fully demonstrates that the present invention achieves the improvement of the negative ion release capacity and resistance capacity of the prepared drawing boards.

[0138] Compared to Example 1, the negative ion material of the mortar component in Comparative Example 1 was tourmaline powder; compared to Comparative Example 1, the titanium dioxide component of the coating component in Comparative Examples 2-5 was modified differently; and the antibacterial drawing boards obtained in Comparative Examples 1-5 showed decreased negative ion release and inhibition zone data. This indicates that the present invention's configuration of the mortar, coating components, and their preparation process can improve the negative ion release and resistance of the resulting drawing boards.

[0139] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0140] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A preparation process of an antibacterial drawing board capable of slowly releasing negative ions, characterized in that: The preparation process includes the following: A substrate is taken, mortar is applied on the surface of the substrate, a mesh cloth is superimposed on the surface of the mortar, and finally a coating is applied on the surface of the mesh cloth to obtain an antibacterial drawing board; The coating comprises the following components: 100 parts of water-based UV coating, 10 to 15 parts of barium sulfate, 1 to 5 parts of titanium dioxide, and 150 to 200 parts of water; Titanium dioxide is surface modified by the following process: Mix titanium dioxide and ethanol, stir and disperse for 15 to 30 minutes, add coupling agent KH-550, stir and react for 30 to 40 minutes to obtain coupled modified titanium dioxide; Dispersing the coupled modified titanium dioxide in deionized water, adding L-tyrosine hydrochloride, L-lysine hydrochloride, and nickel chloride in sequence and mixing evenly, adjusting the pH of the system to 9.7-10.3 with sodium hydroxide, stirring at 45-50 rpm for 100-150 minutes at a temperature of 55-65°C to obtain amino acid-modified titanium dioxide; The amino acid-modified titanium dioxide is dispersed in deionized water, the pH of the system is adjusted to 8.7-9.3 with sodium hydroxide, dimethyl sulfate is slowly added, and the temperature is raised to 38-43°C for reaction for 150-200 minutes to obtain quaternary ammonium-modified titanium dioxide; The quaternized modified titanium dioxide is dispersed in deionized water, the pH of the system is adjusted to 8.7-9.3 using sodium hydroxide, silver nitrate is slowly added, stirred for 18-25 minutes, and placed under 100W ultraviolet light for 170-230 minutes to obtain modified titanium dioxide.

2. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 1, characterized in that: The mortar includes the following components: 55-60 parts of heavy calcium carbonate, 12-20 parts of silicon dioxide, 4-6 parts of graphite, 6-20 parts of negative ion materials, 1.5-2.0 parts of rubber powder, 0.3-0.4 parts of hydroxypropyl methylcellulose, 0.1-0.3 parts of lignin fiber, and 33-41 parts of water.

3. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 2, characterized in that: The negative ion material is a mixture of tourmaline powder and rare earth minerals, and the mass ratio of the tourmaline powder and the rare earth minerals is (4-6): (3-15).

4. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 1, characterized in that: Furthermore, after the mesh cloth is superimposed on the mortar surface, it is placed at a temperature of 21 to 25° C. and a relative humidity of 45 to 55% for curing for 1 to 3 days.

5. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 1, characterized in that: After the coating is applied, light curing is carried out, and the process conditions are: 365nm ultraviolet irradiation for 1 to 2 minutes.

6. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 1, characterized in that: The thickness of the mortar is 0.5-0.8 mm; the thickness of the coating is 2-4 μm.

7. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 1, characterized in that: The substrate is a polystyrene plate; the thickness of the substrate is 40 to 60 mm.

8. The process for preparing an antibacterial drawing board capable of slowly releasing negative ions according to claim 1, characterized in that: The mesh cloth is an alkali-resistant glass fiber mesh cloth with a gram weight of 80-110g / m 2 , thickness is 0.20~0.35mm.

9. An antibacterial drawing board capable of slowly releasing negative ions, prepared according to the preparation process according to any one of claims 1 to 8.

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