A water-based nano-dispersion of far-infrared negative oxygen ion material

Abstract

This solution relates to the coatings field and proposes an aqueous nano-dispersion of far-infrared negative oxygen ion material. By weight, it comprises: 300-350 parts water; 35-45 parts wetting agent; 40-60 parts dispersant; 25-35 parts defoamer; 35-45 parts multifunctional additive; 5-7 parts thickener; 400-600 parts activated far-infrared negative oxygen ion material; 1-3 parts accelerator; and 3-5 parts shielding agent. This solution designs a multi-component synergistically promoting activated far-infrared negative oxygen ion material, which can improve the hemispherical spectral emissivity in the 4-14μm band, even reaching above 0.95 in the key 8-12μm band, effectively promoting formaldehyde decomposition with a long-lasting effect, while also improving antibacterial properties.

Description

Technical Field

[0001] This invention relates to the field of coatings, specifically to an aqueous nano-dispersion of far-infrared negative oxygen ion material. Background Technology

[0002] Indoor formaldehyde pollution and the growth of microorganisms on wall surfaces can deteriorate the living environment, stimulating the demand for formaldehyde-removing and antibacterial coatings. Current technologies often control formaldehyde and bacteria by adding adsorbents and antibacterial agents, but these methods, especially adsorption-based formaldehyde removal, suffer from insufficient persistence and low efficiency. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides an aqueous nano-dispersion of far-infrared negative oxygen ion material. It incorporates a multi-component synergistic activation mechanism to enhance the hemispherical spectral emissivity in the 4-14 μm band, reaching over 0.95 in the critical 8-12 μm band. This effectively promotes formaldehyde decomposition with a long-lasting effect, while also improving antibacterial properties. As a coating additive, it exhibits good environmental adaptability and significantly improves the formaldehyde removal and antibacterial properties of coatings.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] This solution proposes an aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0006] 300-350 parts water;

[0007] 35-45 parts wetting agent;

[0008] 40-60 parts of dispersant;

[0009] 25-35 parts of defoamer;

[0010] 35-45 parts of multifunctional additive;

[0011] Thickener 5-7 parts;

[0012] 400-600 parts of activated far-infrared negative oxygen ion material;

[0013] Accelerator 1-3 parts;

[0014] 3-5 parts of shielding agent;

[0015] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0016] Step (1): By weight, add 10-20 parts tourmaline powder, 5-10 parts maifanite powder, and 3-5 parts tetrabutyl titanate to 50-60 parts of an alcohol aqueous solution, add dispersant A, and then grind to D.50 A pre-formed slurry is obtained with a particle size of less than 0.8 μm.

[0017] Step (2): Mix the pre-made slurry with the dry plant-based carbon source at a mass ratio of 1:1-2, then add 0.1-0.5% of the pre-made slurry mass of boron-containing compound powder, ball mill evenly, dry, calcine in an oxygen-free environment, and disperse at high speed to obtain activated far-infrared negative oxygen ions. This scheme is based on the spontaneous far-infrared release characteristics of tourmaline and is improved in order to achieve the effects of formaldehyde removal and antibacterial. The following improvements are made to the activated far-infrared negative oxygen ion material: 1. Based on the carbon particles generated from the calcined dry plant-based carbon source in step (2), tourmaline powder particles modified with nano-boron-doped titanium dioxide and maifanite particles modified with nano-boron-doped titanium dioxide are attached to the surface; 2. The generated carbon particles are similar to activated carbon, with a porous structure on the surface. After the carbon particles are loaded with tourmaline, the carbon particles adsorb formaldehyde. At the same time, the tourmaline powder particles modified with nano-boron-doped titanium dioxide significantly improve the adsorption capacity by 4-14% compared with simple tourmaline powder due to the catalytic effect of boron-doped titanium dioxide. The hemispherical spectral emissivity of μm and the release efficiency of negative ions, together with their synergistic efficiency, improve the formaldehyde decomposition efficiency; 3. Maifan stone itself has a porous structure and a certain bactericidal effect. The microporous structure of the maifan stone particles modified with boron-doped titanium dioxide adsorbs air molecules, which helps the tourmaline powder particles modified with boron-doped titanium dioxide to release negative ions and the boron-doped titanium dioxide to catalyze the generation of active oxygen, thereby further improving the bactericidal effect.

[0018] Preferably, the wetting agent is a nonionic surfactant; the dispersant is a polycarboxylate or polyphosphate; the defoamer is an organosilicon defoamer; the multifunctional additive is a pH adjuster, preservative, and film-forming aid in a mass ratio of 3-5:1:1-2; the thickener is a cellulose-based thickener; the accelerator is a transition metal salt; and the shielding agent is barium sulfate.

[0019] Nonionic surfactants, such as alkylphenol polyoxyethylene ethers and silicone wetting agents, are used to enhance the wettability of coatings on walls or substrates. Polycarboxylate salts, such as sodium polyacrylate, and polyphosphates, such as sodium hexametaphosphate, are used to prevent particle agglomeration, stabilize the dispersion system, and improve material uniformity. Silicone defoamers, such as polydimethylsiloxane, eliminate bubbles and reduce coating defects. pH adjusters include AMP-95, preservatives include isothiazolinone, and film-forming aids include alcohol ester film-forming aids, ether film-forming aids, or alcohol ether ester film-forming aids (propylene glycol phenyl ether). Cellulose thickeners, such as hydroxyethyl cellulose, adjust viscosity. Transition metal salts, such as silver nitrate and zinc sulfate, are used to promote the release of negative ions. Shielding agents mainly absorb radiation.

[0020] Preferably, in step (1), the particle size of the tourmaline powder is 2000 mesh; the particle size of the maifanite powder is 2000 mesh.

[0021] Preferably, in step (1), dispersant A is a polyurethane dispersant (BYK-2155); the alcohol in the aqueous solution has an alcohol mass percentage of 5-10%.

[0022] Preferably, in step (1), grinding is performed until D... 50 The process for particles smaller than 0.8μm is as follows: grinding in a sand mill at a speed of 2000r / min for 4 hours, with zirconium beads having a particle size of 0.1mm in the sand mill.

[0023] Preferably, in step (2), the dried plant-based carbon source is bran granules, straw granules, or grass and leaf granules; the particle size of the dried plant-based carbon source is 100-200 mesh.

[0024] Preferably, in step (2), the drying conditions for drying after ball milling are: nitrogen atmosphere, drying at 60-80℃.

[0025] Ball milling is mainly used to homogenize the components, break up similar agglomerates, and ensure that different components come into full contact; drying conditions are used to prevent carbon particle oxidation.

[0026] Preferably, in step (2), the oxygen-free calcination process conditions are: nitrogen atmosphere, heating to 700-850℃ at 2-5℃ / min, holding for 2-4h, cooling to room temperature and then taking it out into the air environment.

[0027] Preferably, the boron-containing compound powder is boric acid powder or borate powder.

[0028] Compared with existing technologies, this solution has the following advantages:

[0029] 1. A multi-component synergistic activation far-infrared negative oxygen ion material was designed, which can improve the hemispherical spectral emissivity in the 4-14μm band and even reach above 0.95 in the key 8-12μm band, effectively promoting formaldehyde decomposition with long-lasting effect, while also improving antibacterial effect.

[0030] 2. The far-infrared negative oxygen ion material aqueous nano-dispersion prepared by this method can be used as a coating additive, with good environmental adaptability, and can significantly improve the formaldehyde removal performance and antibacterial performance of coatings; at the same time, the process preparation method of the far-infrared negative oxygen ion material aqueous nano-dispersion is simple and utilizes plant-based carbon sources, which has the characteristics of being green and environmentally friendly. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0034] Water 330;

[0035] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0036] 50 parts of sodium hexametaphosphate dispersant;

[0037] 30 parts of defoamer polydimethylsiloxane;

[0038] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0039] 6 parts of cellulose-based thickener;

[0040] 500 parts of activated far-infrared negative oxygen ion material;

[0041] Accelerator: 2 parts zinc sulfate;

[0042] Barium sulfate as shielding agent: 4 parts;

[0043] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0044] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D... 50 The particle size was less than 0.8 μm, reaching 0.73 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0045] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.4% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 70°C in a nitrogen atmosphere, heat to 800°C at 3°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0046] Example 2

[0047] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0048] Water 350;

[0049] 45 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0050] 60 parts of sodium hexametaphosphate dispersant;

[0051] 35 parts of defoamer polydimethylsiloxane;

[0052] The multifunctional additives consist of 20 parts pH adjuster AMP-95, 15 parts preservative isothiazolinone, and 8 parts film-forming aid propylene glycol phenyl ether.

[0053] 7 parts of cellulose-based thickener;

[0054] 600 parts of activated far-infrared negative oxygen ion material;

[0055] Accelerator: 3 parts zinc sulfate;

[0056] Barium sulfate as a shielding agent (5 parts);

[0057] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0058] Step (1): By weight, add 20 parts of 2000-mesh tourmaline powder, 10 parts of 2000-mesh maifanite powder, and 5 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm for 4 hours until D is achieved. 50 The particle size was less than 0.8 μm, reaching 0.72 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0059] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:2, then add 0.5% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 80°C in a nitrogen atmosphere, heat to 800°C at 3°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0060] Example 3

[0061] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0062] Water 330;

[0063] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0064] 50 parts of sodium hexametaphosphate dispersant;

[0065] 30 parts of defoamer polydimethylsiloxane;

[0066] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0067] 6 parts of cellulose-based thickener;

[0068] 500 parts of activated far-infrared negative oxygen ion material;

[0069] Accelerator: 2 parts zinc sulfate;

[0070] Barium sulfate as shielding agent: 4 parts;

[0071] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0072] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D... 50 The particle size was less than 0.8 μm, reaching 0.73 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0073] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.4% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 70°C in a nitrogen atmosphere, heat to 750°C at 5°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0074] Example 4

[0075] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0076] 300 ml of water;

[0077] 35 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0078] 40 parts of sodium hexametaphosphate dispersant;

[0079] Defoamer: 25 parts polydimethylsiloxane;

[0080] The multifunctional additives consist of 15 parts pH adjuster AMP-95, 10 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0081] 5 parts of cellulose-based thickener;

[0082] 400 parts of activated far-infrared negative oxygen ion material;

[0083] One part zinc sulfate accelerator;

[0084] Barium sulfate as a shielding agent (3 parts);

[0085] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0086] Step (1): By weight, add 10 parts of 2000-mesh tourmaline powder, 6 parts of 2000-mesh maifanite powder, and 3 parts of tetrabutyl titanate to 55 parts of an alcohol aqueous solution. Add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a rotation speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D... 50 The particle size was less than 0.8 μm, reaching 0.73 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0087] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.2% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 60°C in a nitrogen atmosphere, heat to 750°C at 2°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, take out and expose to air environment, disperse at high speed to obtain activated far-infrared negative oxygen ion material.

[0088] Comparative Example 1

[0089] The difference from Example 1 is that tourmaline powder and maifanite powder were directly added:

[0090] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0091] Water 330;

[0092] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0093] 50 parts of sodium hexametaphosphate dispersant;

[0094] 30 parts of defoamer polydimethylsiloxane;

[0095] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0096] 6 parts of cellulose-based thickener;

[0097] 330 parts of 2000-mesh tourmaline powder and 170 parts of 2000-mesh maifanite powder;

[0098] Accelerator: 2 parts zinc sulfate;

[0099] Barium sulfate shielding agent, 4 parts.

[0100] Comparative Example 2

[0101] The difference from Example 1 is that no maifan stone powder was added:

[0102] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0103] Water 330;

[0104] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0105] 50 parts of sodium hexametaphosphate dispersant;

[0106] 30 parts of defoamer polydimethylsiloxane;

[0107] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0108] 6 parts of cellulose-based thickener;

[0109] 500 parts of activated far-infrared negative oxygen ion material;

[0110] Accelerator: 2 parts zinc sulfate;

[0111] Barium sulfate as shielding agent: 4 parts;

[0112] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0113] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D 50 The particle size was less than 0.8 μm, reaching 0.74 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0114] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.4% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 70°C in a nitrogen atmosphere, heat to 800°C at 3°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0115] Comparative Example 3

[0116] The difference from Example 1 is that no plant-based carbon source was added:

[0117] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0118] Water 330;

[0119] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0120] 50 parts of sodium hexametaphosphate dispersant;

[0121] 30 parts of defoamer polydimethylsiloxane;

[0122] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0123] 6 parts of cellulose-based thickener;

[0124] 500 parts of activated far-infrared negative oxygen ion material;

[0125] Accelerator: 2 parts zinc sulfate;

[0126] Barium sulfate as shielding agent: 4 parts;

[0127] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0128] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D... 50 The particle size was less than 0.8 μm, reaching 0.73 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0129] Step (2): Add 0.4% boric acid powder by weight of the pre-made slurry to the pre-made slurry, ball mill it evenly, dry it at 70°C in a nitrogen atmosphere, heat it to 800°C at 3°C / min in a nitrogen atmosphere, keep it at 3h, cool it to room temperature, take it out and put it into the air environment, disperse it at high speed to obtain activated far-infrared negative oxygen ion material.

[0130] Comparative Example 4

[0131] The difference from Example 1 is that no boron-containing compound powder was added:

[0132] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0133] Water 330;

[0134] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0135] 50 parts of sodium hexametaphosphate dispersant;

[0136] 30 parts of defoamer polydimethylsiloxane;

[0137] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0138] 6 parts of cellulose-based thickener;

[0139] 500 parts of activated far-infrared negative oxygen ion material;

[0140] Accelerator: 2 parts zinc sulfate;

[0141] Barium sulfate as shielding agent: 4 parts;

[0142] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0143] Step (1): By weight, 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate were added to 60 parts of an alcohol aqueous solution. Polyurethane dispersant BYK-2155 was added, and then the mixture was ground for 4 hours in a sand mill with a rotation speed of 2000 r / min and a zirconium bead particle size of 0.1 mm until the D50 was less than 0.8 μm and 0.72 μm, to obtain a pre-made slurry; the alcohol in the alcohol aqueous solution was 8% by mass.

[0144] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, ball mill evenly, dry in a nitrogen atmosphere at 70°C, heat to 800°C at 3°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, take out and put into the air environment, disperse at high speed to obtain activated far-infrared negative oxygen ion material.

[0145] Comparative Example 5

[0146] The difference from Example 1 is that the heating is too slow and the holding time is too long:

[0147] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0148] Water 330;

[0149] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0150] 50 parts of sodium hexametaphosphate dispersant;

[0151] 30 parts of defoamer polydimethylsiloxane;

[0152] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0153] 6 parts of cellulose-based thickener;

[0154] 500 parts of activated far-infrared negative oxygen ion material;

[0155] Accelerator: 2 parts zinc sulfate;

[0156] Barium sulfate as shielding agent: 4 parts;

[0157] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0158] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D... 50 The particle size was less than 0.8 μm, reaching 0.73 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0159] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.4% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 70°C in a nitrogen atmosphere, heat to 800°C at 1°C / min in a nitrogen atmosphere, keep warm for 5 hours, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0160] Comparative Example 6

[0161] The difference from Example 1 is that the temperature rises too quickly and the holding time is too short:

[0162] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0163] Water 330;

[0164] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0165] 50 parts of sodium hexametaphosphate dispersant;

[0166] 30 parts of defoamer polydimethylsiloxane;

[0167] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0168] 6 parts of cellulose-based thickener;

[0169] 500 parts of activated far-infrared negative oxygen ion material;

[0170] Accelerator: 2 parts zinc sulfate;

[0171] Barium sulfate as shielding agent: 4 parts;

[0172] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0173] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution, add polyurethane dispersant BYK-2155, and then grind for 4 hours in a sand mill with a speed of 2000 r / min and a zirconium bead particle size of 0.1 mm, until D... 50 The particle size was less than 0.8 μm, reaching 0.72 μm, to obtain a pre-prepared slurry; the alcohol in the aqueous solution contained 8% alcohol by mass.

[0174] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.4% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 70°C in a nitrogen atmosphere, heat to 800°C at 10°C / min in a nitrogen atmosphere, keep warm for 1 hour, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0175] Comparative Example 7

[0176] The difference from Example 1 is that step (1) does not control D. 50 It is less than 0.8 μm, specifically 0.85 μm.

[0177] An aqueous nano-dispersion of far-infrared negative oxygen ion material, comprising, by weight:

[0178] Water 330;

[0179] 40 parts of alkylphenol polyoxyethylene ether as a wetting agent;

[0180] 50 parts of sodium hexametaphosphate dispersant;

[0181] 30 parts of defoamer polydimethylsiloxane;

[0182] The multifunctional additives consist of 18 parts pH adjuster AMP-95, 12 parts preservative isothiazolinone, and 6 parts film-forming aid propylene glycol phenyl ether.

[0183] 6 parts of cellulose-based thickener;

[0184] 500 parts of activated far-infrared negative oxygen ion material;

[0185] Accelerator: 2 parts zinc sulfate;

[0186] Barium sulfate as shielding agent: 4 parts;

[0187] The preparation method of the activated far-infrared negative oxygen ion material is as follows:

[0188] Step (1): By weight, add 15 parts of 2000-mesh tourmaline powder, 8 parts of 2000-mesh maifanite powder, and 4 parts of tetrabutyl titanate to 60 parts of an alcohol aqueous solution. Add polyurethane dispersant BYK-2155, stir evenly, and obtain a pre-made slurry; the alcohol in the alcohol aqueous solution has an alcohol mass percentage of 8%; D 50 It is 0.85μm;

[0189] Step (2): Mix the pre-made slurry with 120-mesh bran particles at a mass ratio of 1:1, then add 0.4% boric acid powder by mass of the pre-made slurry, ball mill evenly, dry at 70°C in a nitrogen atmosphere, heat to 800°C at 3°C / min in a nitrogen atmosphere, keep warm for 3 hours, cool to room temperature, and then take out into the air environment for high-speed dispersion to obtain activated far-infrared negative oxygen ion material.

[0190] Performance testing:

[0191] 1. Referring to the calibration specification of blackbody radiation source of -50~+90℃ JJF 1080-2002, the hemispherical spectral emissivity in the 4-20μm band was measured, and the results are shown in Table 1;

[0192] 2. Referring to JC / T 1074-2021, the 24-hour purification efficiency (requirement >80%) and persistence of formaldehyde were determined (starting from the second cycle, a purification efficiency >70% was considered effective, and the number of cycles was recorded). The results are shown in Table 2.

[0193] 3. Antibacterial properties were determined according to GB / T 21866-2008 (the bacterial strains were Escherichia coli and Staphylococcus aureus), and the results are shown in Table 2.

[0194] As shown in Table 1:

[0195]

[0196]

[0197] The results above show that, due to the activation process (optimization of the proportions of each component of the activated far-infrared negative oxygen ion material + optimization of the preparation process), Examples 1 to 4 have significantly higher emissivity at the key wavelength of 8-14 μm than Comparative Examples 1 to 8, and even >0.95 in the 8-12 μm band. At the same time, the emissivity in other bands is also generally higher than that of Comparative Examples 1 to 8, and the formaldehyde removal efficiency is higher, the duration is longer, and the antibacterial effect is better.

[0198] Compared with Example 1, Comparative Example 1 did not prepare activated far-infrared negative oxygen ion material, and therefore its performance indicators were low.

[0199] The difference between Comparative Example 2 and Example 1 is that no maifan stone powder was added, and the antibacterial effect was significantly reduced. The emissivity at the key wavelength of 8-14 μm was also lower than that of Example 1. This is because the addition of maifan stone in Example 1 has a synergistic effect with tourmaline, which can promote the increase of emissivity.

[0200] The difference between Comparative Example 3 and Example 1 is that the carbon particles generated by the lack of a carbon source have a reduced ability to capture formaldehyde and a weakened synergistic efficiency, resulting in low emissivity and low performance.

[0201] The difference between Comparative Example 4 and Example 1 is that no boron-containing compound powder was added, that is, no nano-boron-doped titanium dioxide structure was formed, only nano-titanium dioxide was present, which resulted in low activity of the activated far-infrared negative oxygen ion material. This is mainly because the complex electronic structure of the nano-boron-doped titanium dioxide structure can excite more negative ions.

[0202] The difference between Comparative Example 5 and Example 1 is that the heating was too slow and the holding time was too long, which resulted in excessively large grains and collapse of the porous structure on the surface of the carbon particles, leading to a decrease in performance. The difference between Comparative Example 6 and Example 1 is that the heating was too fast and the holding time was too short, which may result in incomplete reaction and a decrease in performance.

[0203] The difference between Comparative Example 7 and Example 1 is that step (1) does not control D. 50 The particle size is less than 0.8μm, specifically 0.85μm, which will result in poor dispersibility of tourmaline and maifanite, and at the same time, the grain size will be slightly larger after calcination.

[0204] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An aqueous nano-dispersion of far-infrared negative oxygen ion material, characterized in that, By weight, it includes: 300-350 parts water; 35-45 parts wetting agent; 40-60 parts of dispersant; 25-35 parts of defoamer; 35-45 parts of multifunctional additive; Thickener 5-7 parts; 400-600 parts of activated far-infrared negative oxygen ion material; Accelerator 1-3 parts; 3-5 parts of shielding agent; The preparation method of the activated far-infrared negative oxygen ion material is as follows: Step (1): By weight, add 10-20 parts of tourmaline powder, 5-10 parts of maifanite powder, and 3-5 parts of tetrabutyl titanate to 50-60 parts of alcohol aqueous solution, add dispersant A, and then grind until D50 is less than 0.8μm to obtain pre-made slurry; Step (2): Mix the pre-made slurry with the dry plant-based carbon source at a mass ratio of 1:2-3, then add 0.1-0.5% of the boron-containing compound powder by mass of the pre-made slurry, ball mill evenly, dry, heat to 700-850℃ at 2-5℃ / min under nitrogen atmosphere, keep warm for 2-4h, cool to room temperature, take out and put into the air environment, disperse at high speed to obtain activated far-infrared negative oxygen ion material.

2. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, The wetting agent is a nonionic surfactant; the dispersant is a polycarboxylate or polyphosphate; the defoamer is an organosilicon defoamer; the multifunctional additives are pH adjusters, preservatives, and film-forming aids in a mass ratio of 3-5:1:1-2; the thickener is a cellulose-based thickener; the accelerator is a transition metal salt; and the shielding agent is barium sulfate.

3. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, In step (1), the tourmaline powder has a particle size of 2000 mesh; the maifanite powder has a particle size of 2000 mesh.

4. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, In step (1), dispersant A is a polyurethane dispersant; the alcohol in the aqueous alcohol solution has a mass percentage of 5-10%.

5. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, In step (1), the process of grinding until D50 is less than 0.8μm is as follows: grinding for 4 hours in a sand mill with a rotation speed of 2000r / min, and the zirconium bead particle size in the sand mill is 0.1mm.

6. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, In step (2), the dried plant carbon source is bran granules, straw granules, or grass and leaf granules; the particle size of the dried plant carbon source is 100-200 mesh.

7. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, In step (2), the drying conditions for the ball milling and drying process are: nitrogen atmosphere, drying at 60-80℃.

8. The aqueous nano-dispersion of far-infrared negative oxygen ion material as described in claim 1, characterized in that, The boron-containing compound powder is boric acid powder or borate powder.

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