CN111500142A - Environment-friendly latex paint capable of removing formaldehyde and preparation method thereof - Google Patents
Environment-friendly latex paint capable of removing formaldehyde and preparation method thereof Download PDFInfo
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- CN111500142A CN111500142A CN202010504549.XA CN202010504549A CN111500142A CN 111500142 A CN111500142 A CN 111500142A CN 202010504549 A CN202010504549 A CN 202010504549A CN 111500142 A CN111500142 A CN 111500142A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/003—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
- C09D5/028—Pigments; Filters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention relates to an environment-friendly latex paint which comprises the following components in parts by weight: 100 parts of water, 80-120 parts of modified acrylic emulsion, 30-45 parts of modified nano titanium dioxide, 70-86 parts of filler, 5-10 parts of thickener, 1-3 parts of film-forming assistant, 1-3 parts of dispersant and 0.2-0.5 part of defoamer. The invention has the beneficial effects that: (1) the hydroxyl acrylic emulsion modified by organic fluorine improves the mechanical property of the formaldehyde-removing latex paint; (2) the rare earth cerium modified nano titanium dioxide improves the catalytic activity and the antibacterial efficiency for removing formaldehyde; (3) the emulsion paint prepared by the synergistic effect of the formulas has long storage period, good construction effect, no shrinkage of paint film and no cracking after long-term use.
Description
Technical Field
The invention belongs to the technical field of emulsion paints, and particularly relates to an environment-friendly emulsion paint capable of removing formaldehyde and a preparation method thereof.
Background
With the development of national economy, the construction completion area of newly-built houses is continuously increased every year, the coating finishing rate of the houses is continuously improved, and meanwhile, with the improvement of the living standard of people, the house maintenance and re-decoration frequency is accelerated, and the market demand of emulsion paint is vigorous. In addition, the emerging new rural construction also greatly stimulates the popularization and application of various architectural coatings, which is a high-speed growth of domestic architectural coating production enterprises. At present, a plurality of inner wall emulsion paint production enterprises are provided, the production conditions are greatly different, and the product quality is not uniform. Even if the same brand is used, the series is different, the quality is different, and the price difference is larger. The most applied inner wall coating in the market is styrene-acrylic emulsion paint, the low-grade styrene-acrylic emulsion paint has low price and poor performance, and the formaldehyde purification performance only meets the lowest value required by the national standard; along with the improvement of living standard of people, the environmental protection requirement on living environment is higher and higher, and an interior wall coating with excellent performance, moderate price and environmental protection is urgently needed in the market.
In order to solve the problems, some latex paints capable of removing formaldehyde are invented, for example, Chinese patent No. CN201910752378.X discloses a latex paint capable of removing formaldehyde and a preparation method thereof. However, the addition of the formaldehyde elimination agent reduces the adhesive property of the paint film, influences the service life and weather resistance, and the elimination rate of formaldehyde is rapidly reduced along with the prolonging of the service time. Therefore, the development of novel latex paints capable of removing formaldehyde is urgently needed at present, and the formaldehyde removal rate and the comprehensive performance of the latex paints are improved.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the latex paint capable of eliminating formaldehyde and the preparation method thereof, wherein the latex paint comprises the following components in parts by weight: 100 parts of water, 80-120 parts of modified acrylic emulsion, 30-45 parts of modified nano titanium dioxide, 70-86 parts of filler, 5-10 parts of thickener, 1-3 parts of film-forming assistant, 1-3 parts of dispersant and 0.2-0.5 part of defoamer;
the modified acrylic emulsion is fluorine modified hydroxyl acrylic emulsion which is synthesized by taking perfluoroalkyl acrylate as a functional monomer through a semi-continuous emulsion polymerization method; the emulsion forms a copolymerization structure containing fluoroalkyl and hydroxyl side chains through optimized combination among monomers, and the structure utilizes the characteristic of low polarizability of the fluoroalkyl to enable the fluoroalkyl to show extremely low surface free energy and further show excellent water resistance; on the other hand, in order to avoid the problem of mechanical property reduction caused by low intermolecular force, a small amount of hydroxyl is introduced into a side chain, and a compact network structure is formed by utilizing the interaction between the hydroxyl or the hydroxyl and a film-forming assistant so as to improve the mechanical property;
the preparation method of the modified acrylic emulsion comprises the following steps: adding alkylphenol ethoxylates, sodium bicarbonate and deionized water into a reaction kettle, stirring at a high speed for 30min, heating to 70-75 ℃, adding 20% of ammonium persulfate initiator, and dropwise adding 1/3 mixed monomers (methyl methacrylate, butyl acrylate, methacrylic acid and perfluoroalkyl acrylate) within 30min to form seed emulsion. And continuing to react for 20min after the emulsion generates blue light, slowly dropwise adding the N-hydroxymethyl acrylamide aqueous solution and the rest mixed monomer into the reaction kettle, controlling the dropwise adding within 3h, dropwise adding the initiator once every 15min, dropwise adding hydroxyethyl acrylate, raising the temperature to 80-85 ℃ after the dropwise adding is finished, and continuing to stir for reacting for 1-2 h. And finally, cooling to below 40 ℃, adding ammonia water to adjust the pH value to 7-8, and discharging to obtain the organic fluorine modified acrylic emulsion.
The modified nano titanium dioxide is rare earth cerium doped anatase type nano TiO2On one hand, the material utilizes the photoactivity of anatase type nano titanium dioxide and can adsorb formaldehyde and other organic matters on the surfaceDegradation of pollutants to CO2And H2O and other harmless substances, thereby achieving the purpose of purifying air; on the other hand, the nano titanium dioxide is also an antibacterial agent, and the doping of rare earth cerium can further improve TiO2The photocatalytic activity of the composite material improves the antibacterial capability and the degradation efficiency of formaldehyde;
the rare earth cerium doped anatase type nano TiO2The preparation method comprises the following steps: mixing anatase type nano TiO2Fully dispersing the mixture into deionized water by ultrasonic waves, adding cerium sulfate while stirring, controlling the temperature to be 80-90 ℃ after the addition is finished, adjusting the pH value to be 4-5, stirring for 6-7h, washing by distilled water, drying and roasting to obtain the rare earth cerium doped anatase type nano TiO2；
The filler is a composition of titanium dioxide, wollastonite powder and kaolin, the mass ratio of the titanium dioxide to the wollastonite powder to the kaolin is 1: 0.2-0.4: 0.1-0.3, and the particle size distribution range of the composition is 10nm-3 mu m; the composition not only maintains stronger tinting strength and covering power, but also improves the film-forming property and mechanical property of the coating through the formulation and the grading of granularity;
the thickening agent is hydrophobic modified hydroxyethyl cellulose, namely, a long carbon chain hydrophobic modified hydroxyethyl cellulose polymer is formed through etherification reaction between hydroxyl and halogenated alkane; the hydrophobic modified hydroxyethyl cellulose contains hydrophilic and hydrophobic groups at the same time, and can have better interaction with an organic film-forming aid and an inorganic filler system, so that the prepared emulsion paint has moderate viscosity and fine and plump appearance, does not have precipitation and layering phenomena during storage, and improves the storage time of the emulsion paint;
the preparation method of the hydrophobization modified hydroxyethyl cellulose comprises the following steps: firstly, dispersing hydroxyethyl cellulose in isopropanol, then adding a 5% NaOH solution, stirring for 24h until the mixture is completely swelled, then adding an isopropanol solution of bromooctadecane, reacting for 3-5h at 80 ℃, respectively washing with n-hexane and acetone, adjusting the pH value to 7-8 with glacial acetic acid, and drying in vacuum to obtain the hydrophobically modified hydroxyethyl cellulose.
The film-forming additive is a composition of alcohol ester dodeca and propylene glycol, and the mass ratio of the alcohol ester dodeca to the propylene glycol is 1: 0.1-0.3; the composition fully utilizes the synergistic effect of ester group and hydroxyl, can form a film with the modified acrylic emulsion better, does not shrink after film forming, and does not generate cracks after long-term use;
the dispersing agent is at least one of sodium dodecyl sulfate, methyl amyl alcohol, polyacrylamide, sodium tripolyphosphate or water glass;
the defoaming agent is an organic silicon defoaming agent and comprises at least one of polydimethylsiloxane, fluorosilicone and ethylene glycol siloxane.
The invention also provides a preparation method of the formaldehyde-removing environment-friendly latex paint, which comprises the following steps:
(1) adding water, modified acrylic emulsion, film-forming assistant and dispersant in corresponding parts by mass into a reaction kettle, and fully stirring and mixing to obtain base slurry;
(2) adding modified nano titanium dioxide, filler, defoaming agent and thickening agent into the basic slurry, raising the temperature to 50-60 ℃, vigorously stirring for 3-4h, then adding ammonia water to adjust the pH value to 7-8, continuously stirring for 1-2h, carrying out vacuum defoaming, cooling and discharging to obtain the formaldehyde-removed emulsion paint.
The invention has the beneficial effects that: (1) the hydroxyl acrylic emulsion modified by organic fluorine improves the mechanical property of the formaldehyde-removing latex paint; (2) the rare earth cerium modified nano titanium dioxide improves the catalytic activity and the antibacterial efficiency for removing formaldehyde; (3) the emulsion paint prepared by the synergistic effect of the formulas has long storage period, good construction effect, no shrinkage of paint film and no cracking after long-term use.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1:
the embodiment provides an environment-friendly latex paint capable of eliminating formaldehyde, which comprises the following components in parts by weight: 100 parts of water, 80 parts of modified acrylic emulsion, 32 parts of modified nano titanium dioxide, 75 parts of filler, 6 parts of thickener, 1 part of film-forming assistant, 1 part of sodium dodecyl sulfate and 0.3 part of polydimethylsiloxane defoamer;
the modified acrylic emulsion is fluorine modified hydroxyl acrylic emulsion which is synthesized by taking perfluoroalkyl acrylate as a functional monomer through a semi-continuous emulsion polymerization method;
the preparation method of the modified acrylic emulsion comprises the following steps of adding 17.4g of alkylphenol ethoxylates, 8.7g of sodium bicarbonate and 900m L of deionized water into a reaction kettle, stirring at a high speed for 30min, heating to 70-75 ℃, adding 20% of ammonium persulfate initiator, dropwise adding 1/3 of mixed monomers (the total amount of the mixed monomers is 230g of methyl methacrylate, 180g of butyl acrylate, 100g of methacrylic acid and 360g of perfluoroalkyl acrylate) within 30min to form a seed emulsion, continuing to react for 20min after the emulsion has blue light, slowly dropwise adding the N-hydroxymethyl acrylamide aqueous solution and the rest of the mixed monomers into the reaction kettle, controlling the dropwise adding to be completed within 3h, dropwise adding the initiator once every 15min, dropwise adding 30g of hydroxyethyl acrylate, raising the temperature to 80-85 ℃ after the dropwise adding is completed, continuing to stir for reaction for 1-2h, finally cooling to below 40 ℃, adding ammonia water to adjust the pH value to 7-8, and discharging to obtain the fluorine modified hydroxyl acrylic emulsion.
The modified nano titanium dioxide is rare earth cerium doped anatase type nano TiO2The preparation method comprises the following steps: 50g of anatase type nano TiO2(10-20nm) is fully dispersed into 3L deionized water by ultrasonic waves, then 12g of cerium sulfate is added while stirring, the temperature is controlled to be 80-90 ℃ after the addition is finished, the pH value is adjusted to be 4-5, the stirring is carried out for 6-7h, the washing is carried out by distilled water, the drying and the roasting at the temperature of 500-600 ℃ are carried out to obtain the rare earth cerium doped anatase type nano TiO2；
The filler is a composition of titanium dioxide, wollastonite powder and kaolin, the mass ratio of the titanium dioxide to the wollastonite powder to the kaolin is 1: 0.3: 0.23, and the particle size distribution range of the composition is between 10nm and 3 mu m;
the thickening agent is hydrophobic modified hydroxyethyl cellulose, namely a long carbon chain hydrophobic modified hydroxyethyl cellulose polymer is formed through etherification reaction between hydroxyl and halogenated alkane, and the preparation process of the hydrophobic modified hydroxyethyl cellulose comprises the steps of firstly dispersing 100g of hydroxyethyl cellulose in 600m L isopropanol, then adding a 5% NaOH solution 25m L, stirring for 24h until complete swelling, adding a bromooctadecane isopropanol solution 100m L (dissolved with 16.5g of bromooctadecane), reacting for 4h at 80 ℃, respectively washing with n-hexane and acetone, adjusting the pH value to 7-8 with glacial acetic acid, and drying in vacuum to obtain the hydrophobic modified hydroxyethyl cellulose.
The film-forming aid is a composition of alcohol ester dodeca and propylene glycol, and the mass ratio of the alcohol ester dodeca to the propylene glycol is 1: 0.10.
The preparation method of the environment-friendly latex paint capable of removing formaldehyde provided by the embodiment specifically comprises the following steps:
(1) adding 1000m L parts by mass of water, 800g of fluorine modified hydroxyl acrylic emulsion, 10g of a composition of alcohol ester dodeca and propylene glycol and 10g of sodium dodecyl sulfate into a reaction kettle, and fully stirring and mixing to obtain basic slurry;
(2) adding rare earth cerium doped anatase type nano TiO into base slurry2320g of filler composition, 750g of dimethyl silicone rubber defoaming agent, 3g of hydrophobic modified hydroxyethyl cellulose, raising the temperature to 50-60 ℃, violently stirring for 3-4h, then adding ammonia water to adjust the pH value to 7-8, continuously stirring for 1-2h, defoaming in vacuum, cooling and discharging to obtain the formaldehyde-removing latex paint.
Example 2:
the embodiment provides an environment-friendly latex paint capable of eliminating formaldehyde, which comprises the following components in parts by weight: 100 parts of water, 100 parts of modified acrylic emulsion, 37 parts of modified nano titanium dioxide, 80 parts of filler, 8 parts of thickener, 2 parts of film-forming assistant, 2 parts of sodium tripolyphosphate and 0.3 part of ethylene glycol siloxane defoamer;
the modified acrylic emulsion and the preparation method thereof are the same as example 1;
the modified nano titanium dioxide and the preparation method thereof are the same as the embodiment 1;
the filler is a composition of titanium dioxide, wollastonite powder and kaolin, the mass ratio of the titanium dioxide to the wollastonite powder to the kaolin is 1: 0.32: 0.13, and the particle size distribution range of the composition is between 10nm and 3 mu m;
the thickener and the preparation method thereof are the same as in example 1.
The film-forming additive is a composition of alcohol ester dodeca and propylene glycol, and the mass ratio of the alcohol ester dodeca to the propylene glycol is 1: 0.21;
the preparation method of the embodiment is the same as that of the embodiment 1, and the components are only required to be proportionally and equivalently replaced.
Example 3:
the embodiment provides an environment-friendly latex paint capable of eliminating formaldehyde, which comprises the following components in parts by weight: 100 parts of water, 110 parts of modified acrylic emulsion, 43 parts of modified nano titanium dioxide, 86 parts of filler, 9 parts of thickener, 3 parts of film-forming assistant, 2 parts of sodium tripolyphosphate and 0.3 part of polydimethylsiloxane defoamer;
the modified acrylic emulsion and the preparation method thereof are the same as example 1;
the modified nano titanium dioxide and the preparation method thereof are the same as the embodiment 1;
the filler is a composition of titanium dioxide, wollastonite powder and kaolin, the mass ratio of the titanium dioxide to the wollastonite powder to the kaolin is 1: 0.27: 0.21, and the particle size distribution range of the composition is between 10nm and 3 mu m;
the thickener and the preparation method thereof are the same as in example 1.
The film-forming additive is a composition of alcohol ester dodeca and propylene glycol, and the mass ratio of the alcohol ester dodeca to the propylene glycol is 1: 0.25;
the preparation method of the embodiment is the same as that of the embodiment 1, and the components are only required to be proportionally and equivalently replaced.
In order to verify the technical effect of the invention, the purification effect and the purification durability of the latex paint prepared by the invention are tested by JC/T1074-2008 'indoor air purification function coating material purification performance'; the performance of the mechanics is tested by adopting JG/T172-2005 elastic building coating standard, and the related test results are shown in Table 1;
TABLE 1 Properties of Formaldehyde-removable latex paints
As can be seen from the data in Table 1, the formaldehyde purification efficiency and purification durability of the latex paint prepared by the invention reach the national standard, and the mechanical properties are remarkably improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The latex paint capable of eliminating formaldehyde comprises the following components in parts by weight: 100 parts of water, 80-120 parts of modified acrylic emulsion, 30-45 parts of modified nano titanium dioxide, 70-86 parts of filler, 5-10 parts of thickener, 1-3 parts of film-forming assistant, 1-3 parts of dispersant and 0.2-0.5 part of defoamer; it is characterized in that the preparation method is characterized in that,
the modified acrylic emulsion is fluorine modified hydroxyl acrylic emulsion which is synthesized by taking perfluoroalkyl acrylate as a functional monomer through a semi-continuous emulsion polymerization method;
the modified nano titanium dioxide is rare earth cerium doped anatase type nano TiO2；
The filler is a composition of titanium dioxide, wollastonite powder and kaolin, the mass ratio of the titanium dioxide to the wollastonite powder to the kaolin is = 1: 0.2-0.4: 0.1-0.3, and the particle size distribution range of the composition is 10nm-3 mu m;
the thickening agent is hydrophobic modified hydroxyethyl cellulose, namely, a long carbon chain hydrophobic modified hydroxyethyl cellulose polymer is formed through etherification reaction between hydroxyl and halogenated alkane;
the film-forming additive is a composition of alcohol ester dodeca and propylene glycol, and the mass ratio of the alcohol ester dodeca to the propylene glycol is 1: 0.1-0.3;
the dispersing agent is at least one of sodium dodecyl sulfate, methyl amyl alcohol, polyacrylamide, sodium tripolyphosphate or water glass;
the defoaming agent is an organic silicon defoaming agent and comprises at least one of polydimethylsiloxane, fluorosilicone and ethylene glycol siloxane.
2. The latex paint capable of eliminating formaldehyde according to claim 1, wherein the preparation of the modified acrylic emulsion comprises the following steps: adding alkylphenol polyoxyethylene, sodium bicarbonate and deionized water into a reaction kettle, stirring at high speed for 30min, heating to 70-75 ℃, adding 20% of ammonium persulfate initiator, dropwise adding 1/3 mixed monomers (methyl methacrylate, butyl acrylate, methacrylic acid and perfluoroalkyl acrylate) within 30min to form seed emulsion,
continuing to react for 20min after the emulsion generates blue light, slowly dropwise adding the N-hydroxymethyl acrylamide aqueous solution and the rest mixed monomer into the reaction kettle, controlling the dropwise adding within 3h, dropwise adding the initiator once every 15min, then dropwise adding the hydroxyethyl acrylate, raising the temperature to 80-85 ℃ after the dropwise adding is finished, continuing to stir for reaction for 1-2h,
and finally, cooling to below 40 ℃, adding ammonia water to adjust the pH value to 7-8, and discharging to obtain the organic fluorine modified acrylic emulsion.
3. The latex paint capable of eliminating formaldehyde according to claim 1, wherein the rare earth cerium-doped anatase type nano TiO is characterized in that2The preparation method comprises the following steps: mixing anatase type nano TiO2Fully dispersing the mixture into deionized water by ultrasonic waves, adding cerium sulfate while stirring, controlling the temperature to be 80-90 ℃ after the addition is finished, adjusting the pH value to be 4-5, stirring for 6-7h, washing by distilled water, drying and roasting to obtain the rare earth cerium doped anatase type nano TiO2。
4. The latex paint capable of eliminating formaldehyde according to claim 1, wherein the hydrophobically modified hydroxyethyl cellulose is prepared by the following steps: firstly, dispersing hydroxyethyl cellulose in isopropanol, then adding a 5% NaOH solution, stirring for 24h until the mixture is completely swelled, then adding an isopropanol solution of bromooctadecane, reacting for 3-5h at 80 ℃, respectively washing with n-hexane and acetone, adjusting the pH value to 7-8 with glacial acetic acid, and drying in vacuum to obtain the hydrophobically modified hydroxyethyl cellulose.
5. A preparation method of latex paint capable of eliminating formaldehyde is characterized by comprising the following steps:
(1) adding water, modified acrylic emulsion, film-forming assistant and dispersant in corresponding parts by mass into a reaction kettle, and fully stirring and mixing to obtain base slurry;
(2) adding modified nano titanium dioxide, filler, defoaming agent and thickening agent into the basic slurry, raising the temperature to 50-60 ℃, vigorously stirring for 3-4h, then adding ammonia water to adjust the pH value to 7-8, continuously stirring for 1-2h, carrying out vacuum defoaming, cooling and discharging to obtain the formaldehyde-removed emulsion paint.
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| CN114316723A (en) * | 2022-01-29 | 2022-04-12 | 重庆交通大学 | Photocatalytic film-forming composition, and preparation method and application thereof |
| CN115449265A (en) * | 2022-10-24 | 2022-12-09 | 王洪涛 | Formaldehyde-removing coating and preparation method thereof |
| CN116550095A (en) * | 2023-06-29 | 2023-08-08 | 广东职业技术学院 | Air purifying composition for removing peculiar smell and preparation method thereof |
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