CN114891382A - Water-based nano interior wall odor-removing coating and preparation method thereof - Google Patents
Water-based nano interior wall odor-removing coating and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of coatings, and particularly relates to a water-based nano interior wall odor-removing coating and a preparation method thereof. The coating is prepared from the following raw materials in parts by weight: 1-2 parts of nano tin dioxide, 0.8-1.2 parts of nano magnesium oxide, 0.8-1.2 parts of nano aluminum oxide, 1.8-2.2 parts of nano aluminum sol, 4-6 parts of nano titanium dioxide, 38-42 parts of nano calcium carbonate, 0.9-1.1 parts of methyl cellulose, 0.9-1.1 parts of ethyl cellulose, 0.3-0.5 part of polyacrylate water solution, 0.01-0.08 part of defoaming agent, 0.8-1.2 parts of gas phase method silicon dioxide, 0.18-0.22 part of organic silicon, 7-9 parts of ash calcium powder, 2-4 parts of nano zinc oxide, 0.8-1.2 parts of coupling agent and 30-35 parts of water. The coating is used for the inner wall of a building and has the advantages of high safety and lasting odor removal effect.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a water-based nano interior wall odor-removing coating and a preparation method thereof.
Background
Indoor air pollution is mainly a phenomenon of pollution to the indoor environment due to various volatile organic compounds in the indoor air. The indoor pollutants mainly comprise formaldehyde, benzene organic matters and the like, and the photocatalyst catalytic material isUnder the action of sunlight or lamplight, valence band electrons are subjected to interband transition, so that photoelectrons (e) are generated - ) And a cavity (h) + ) The dissolved oxygen on the surface traps electrons to form superoxide anions, and the holes oxidize hydroxide ions and water adsorbed on the surface of the particles to hydroxyl radicals. The superoxide anion and hydroxyl radical have strong oxidizability, and can oxidize and degrade most organic matters (such as formaldehyde, benzene, smoke smell or peculiar smell components and the like), thereby removing peculiar smell molecules. Therefore, the photocatalyst catalytic material is added into the paint to play a role in removing formaldehyde, benzene and other peculiar smell substances to a certain degree.
Chinese patent CN103131313B discloses a composite photocatalyst air purification water-based interior wall coating and a preparation method thereof, wherein the coating comprises the following raw materials in percentage by weight: 5.5-22.3% of photocatalytic filler; 25-65% of polyurethane emulsion; 1-6% of propylene glycol phenyl ether; 2-6% of a dispersant; 2-4% of a stabilizer; 1-2% of a wetting agent; 20-60% of water; 1.5-4% of a mildew inhibitor; 1-2% of a defoaming agent; 0.5-2% of a leveling agent; 0.5-1% of a thickening agent; the photocatalytic filler is formed by matching nano anatase titanium dioxide with nano zinc oxide or nano tin dioxide in a weight ratio of 5-9: 1-5, and the particle size of the nano anatase titanium dioxide is 20-200 nm; the particle size of the nano zinc oxide is 5-100 nm; the particle size of the nano tin dioxide is 5-200 nm. The existing interior wall coating has the disadvantages that organic solvents are adopted in the raw materials for preparing the film-forming material polyurethane in the formula, propylene glycol phenyl ether adopted in the formula has certain pollution, and the photocatalytic filler in the interior wall coating is easy to inactivate or peel off along with the prolonging of the service time, so that the photocatalytic effect of the photocatalyst is obviously reduced. Therefore, the invention provides the long-acting and high-safety water-based nano interior wall odor-removing coating, which is a problem to be solved urgently at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the water-based nano interior wall odor-removing coating and the preparation method thereof, and the coating has high safety and long-acting formaldehyde-removing effect.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a water-based nano interior wall odor-removing coating which comprises the following raw materials in parts by weight:
further, the particle size of the nano titanium dioxide is 5-10 nm; preferably, the particle size of the nano titanium dioxide is 5 nm.
Further, the particle size of the nano zinc oxide is 40-60 nm; preferably, the particle size of the nano zinc oxide is 50 nm.
Further, the coating also comprises 1-2 parts of nano tin dioxide.
Further, the particle size of the nano tin dioxide is 50 nm.
Further, the particle size of the nano calcium carbonate is 60-100 nm; preferably, the particle size of the nano calcium carbonate is 80 nm.
And/or the particle size of the nano alumina is 40-60 nm; preferably, the particle size of the nano alumina is 50 nm;
and/or the particle size of the nano magnesium oxide is 50 nm;
and/or the particle size of the nano aluminum sol is 10-15 nm.
Further, the cellulose ether comprises 0.9 to 1.1 parts of methyl cellulose and 0.9 to 1.1 parts of ethyl cellulose.
Further, the coating also comprises 0.01-0.08 part of defoaming agent;
and/or 0.18-0.22 parts of organic silicon;
and/or 0.8-1.2 parts of a coupling agent.
Further, the feed additive is composed of the following raw materials in parts by weight: 4-6 parts of nano titanium dioxide, 2-4 parts of nano zinc oxide, 38-42 parts of nano calcium carbonate, 0.8-1.2 parts of nano magnesium oxide, 0.8-1.2 parts of nano aluminum oxide, 1.8-2.2 parts of nano aluminum sol, 0.9-1.1 parts of methyl cellulose, 0.9-1.1 parts of ethyl cellulose, 0.3-0.5 part of polyacrylate water solution, 0.8-1.2 parts of gas phase method silicon dioxide, 7-9 parts of ash calcium powder, 1-2 parts of nano tin dioxide, 0.01-0.08 part of defoaming agent, 0.18-0.22 part of organic silicon, 0.8-1.2 parts of coupling agent and 30-35 parts of water;
preferably, the feed consists of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water.
The invention also provides a preparation method of the water-based nano interior wall odor-removing coating, which comprises the following steps:
s1, adding a polyacrylate water solution and 30-50% of water for the coating emulsion into a container, heating to 50-60 ℃, and stirring and dispersing for 0.5-1 h to obtain a master batch of a dispersion solution;
s2, sequentially adding nano titanium dioxide and nano zinc oxide into the master batch in the S1, heating to 50-70 ℃, stirring and dispersing for 1-3 hours, and cooling to room temperature to obtain a nano photocatalytic mixed master batch;
s3, sequentially adding nano tin dioxide, nano magnesium oxide, nano aluminum sol, nano calcium carbonate and organic silicon into the nano photocatalytic mixed master batch in the S2, heating to 50-60 ℃, stirring and dispersing for 0.5-1 h, and cooling to room temperature to obtain a master batch mixture;
s4, sequentially adding methyl cellulose, ethyl cellulose, sierozem powder and a coupling agent into the master batch mixture in the S3, heating to 50-70 ℃ after adding, preserving heat and stirring for 0.5-1 h;
and S5, adding the defoaming agent, the fumed silica and the balance of water into the feed liquid obtained in the step S4, continuously stirring for 5-20 min, standing and cooling to normal temperature to obtain the silicon dioxide/water.
The invention has the following beneficial effects:
1. the water-based nano interior wall odor-removing coating provided by the invention adopts nano titanium dioxide and nano zinc oxide as main photocatalyst catalytic materials, and is matched with nano raw materials of calcium carbonate, magnesium oxide, aluminum oxide, alumina sol and other auxiliary agents, so that the obtained odor-removing coating has high safety, the nano calcium carbonate can greatly improve the formaldehyde-removing effect of the coating, and the formed coating has a smooth and compact surface, is wear-resistant and is washable.
2. The preparation method of the water-based nano interior wall odor-free coating adopts a unique nano material dispersion process technology, has uniform and stable dispersion, can complete the complete wrapping of titanium dioxide nano particles, has a long-acting formaldehyde removal effect, and has uniform and stable prepared coating, difficult agglomeration and good construction property; the nano materials are uniformly distributed in the mixed solution in batches, so that the compactness of a paint film of the coating is enhanced, the treatment of a bonding interface between nano micro particles is efficient and stable, and the better bonding strength between a nano composite material coating and a base material, more excellent and stable performance and stronger adhesive force are ensured.
3. The water-based nano interior wall odor-removing coating provided by the invention can be prepared into finish paint by adopting conventional methods of spraying, brushing and rolling coating, is widely suitable for the surfaces of any cement base materials or interior walls coated with putty, can form a paint film with good adhesive force on the surface of a wall by adopting water as a solvent in the formula of the coating, and has the advantages of simple construction process and low cost.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to embodiments of the present invention, and the described embodiments are only a part of embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The experimental methods in the examples of the present invention are all conventional methods unless otherwise specified. The raw materials in the following examples are all commercially available products and are commercially available, unless otherwise specified.
In some embodiments, the invention provides a water-based nano interior wall odor-removing coating, which comprises the following raw materials in parts by weight:
the nano titanium dioxide is used as a photocatalyst catalytic material, and can play a role in decomposing formaldehyde, benzene and peculiar smell component molecules in indoor air; the particle size of the nano titanium dioxide is 5-10 nm; further preferably, the particle size of the nano titanium dioxide is 5 nm.
The nano zinc oxide can play roles in enhancing the adhesion, enhancing the smoothness of a coating and resisting bacteria in the coating, and meanwhile, the nano zinc oxide also has certain photocatalytic activity and can enhance the decomposition effect of the coating on formaldehyde, benzene and peculiar smell component molecules; according to other preferred embodiments, the nano zinc oxide has a particle size of 40 to 60 nm; further preferably, the particle size of the nano zinc oxide is 50 nm.
The polyacrylate aqueous solution is used as a dispersing agent and has very excellent dispersing effect on nano-scale titanium dioxide and zinc oxide, and the polyacrylate aqueous solution is used as a dispersing agent and has strong dissociation effect in an aqueous solution system and can be dissociated into macromolecular anions and micromolecular cations, the macromolecular anions and the micromolecular ions are firmly adsorbed on the surfaces of the dispersed nano-particle particles, so that the ions have the same charge, and the ions with opposite charges are freely diffused into a surrounding liquid medium to form a stable diffusion layer of charged ions, namely an electric double layer, thereby completing the perfect wrapping of the nano-particle. In a preferred embodiment, the aqueous solution of polyacrylic acid salt is an aqueous solution of sodium polyacrylate with a solid content of 40%. If the amount of the polyacrylate aqueous solution added is too large, the suspended particles are excessively adsorbed, and the surface charge is reversed, resulting in an increase in hydrophilicity and impairing the film-forming effect.
Fumed silica is used as an anti-settling agent in the coating of the present invention.
The nano calcium carbonate has the advantage of large specific surface area, has certain adsorption effect on micromolecular formaldehyde, benzene and the like when being used as a filling agent of the coating, and adsorbs peculiar smell molecules in the coating, thereby improving the peculiar smell purification effect of the photocatalyst catalytic material; according to some preferred embodiments, the nano calcium carbonate has a particle size of 60 to 100 nm; further preferably, the particle size of the nano calcium carbonate is 80 nm.
The nano aluminum oxide added into the paint can enhance the wear resistance and the water washing resistance of a paint film; according to some preferred embodiments, the nano alumina has a particle size of 40 to 60 nm; further preferably, the particle size of the nano alumina is 50 nm.
The nano magnesium oxide is used as an emulsifier and a filler; according to some preferred embodiments, the nano-magnesia has a particle size of 50 nm.
The nano aluminum sol is mainly used as an emulsifier for enhancing the viscosity of a coating system and increasing the film forming effect of a paint film; according to some preferred embodiments, the nano aluminum sol has a particle size of 10 to 15 nm.
The cellulose ether mainly plays a role in thickening, can enhance the viscosity of the paint, improve the film forming effect of a paint film and enhance the elasticity of the paint film; according to some preferred embodiments, the cellulose ether comprises 0.9 to 1.1 parts of methyl cellulose and 0.9 to 1.1 parts of ethyl cellulose.
The nano tin dioxide can enhance the antibacterial performance of the coating, and according to other preferred embodiments, the coating can further comprise 1-2 parts of nano tin dioxide. Further preferably, the particle size of the nano tin dioxide is 50 nm.
The organic silicon can improve the dirt resistance effect of the surface of the paint film; the coupling agent can increase the hydrophobic property of the surface of the paint film; the coating can also comprise at least one of 0.01-0.08 part of defoaming agent, 0.18-0.22 part of organic silicon and 0.8-1.2 parts of coupling agent.
In a specific embodiment, the selected defoamer is polydimethylsiloxane and the selected coupling agent is octyltriethoxysilane.
In the water-based nano interior wall odor-removing coating provided by the invention, the components have the following functions:
according to other preferred embodiments, the coating consists of the following raw materials in parts by weight: 4-6 parts of nano titanium dioxide, 2-4 parts of nano zinc oxide, 38-42 parts of nano calcium carbonate, 0.8-1.2 parts of nano magnesium oxide, 0.8-1.2 parts of nano aluminum oxide, 1.8-2.2 parts of nano aluminum sol, 0.9-1.1 parts of methyl cellulose, 0.9-1.1 parts of ethyl cellulose, 0.3-0.5 part of polyacrylate water solution, 0.8-1.2 parts of gas phase method silicon dioxide, 7-9 parts of ash calcium powder, 1-2 parts of nano tin dioxide, 0.01-0.08 part of defoaming agent, 0.18-0.22 part of organic silicon, 0.8-1.2 parts of coupling agent and 30-35 parts of water.
Further preferably, the coating consists of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water.
The paint formula adopts water as a solvent to form a paint film with good adhesive force on the surface of a wall body, adopts nano titanium dioxide and nano zinc oxide as main photocatalyst catalytic materials, and is matched with nano raw materials of calcium carbonate, magnesium oxide, aluminum oxide, alumina sol and other auxiliary agents, so that the obtained odorless paint has high safety, the nano calcium carbonate can greatly improve the formaldehyde removal effect of the paint, and the formed paint film has a smooth and compact surface, is wear-resistant and is washable.
The coating provided by the invention selects a large amount of nano components with different particle sizes, and is easy to agglomerate and agglomerate when mixed by a common method, so that the construction process of the coating is difficult. Based on the above, the invention also provides a preparation method of the water-based nano interior wall odor-removing coating, the method can obtain a uniform and stable coating system, complete coating of titanium dioxide nanoparticles in a material adding mode in a specific sequence, and has a long-acting formaldehyde removing effect, and the prepared coating is uniform and stable, is not easy to agglomerate, and has good construction performance. The preparation method specifically comprises the following steps:
s1, adding a polyacrylate water solution and 30-50% of water for the coating emulsion into a container, heating to 50-60 ℃, and stirring and dispersing for 0.5-1 h to obtain a master batch of a dispersion solution;
s2, sequentially adding nano titanium dioxide and nano zinc oxide into the master batch in the S1, heating to 50-70 ℃, stirring and dispersing for 1-3 hours, and cooling to room temperature to obtain a nano photocatalytic mixed master batch;
s3, sequentially adding nano tin dioxide, nano magnesium oxide, nano aluminum sol, nano calcium carbonate and organic silicon into the nano photocatalytic mixed master batch in the S2, heating to 50-60 ℃, stirring and dispersing for 0.5-1 h, and cooling to room temperature to obtain a master batch mixture;
s4, sequentially adding methyl cellulose, ethyl cellulose, sierozem powder and a coupling agent into the master batch mixture in the S3, heating to 50-70 ℃ after adding, preserving heat and stirring for 0.5-1 h;
and S5, adding the defoaming agent, the fumed silica and the balance of water into the feed liquid obtained in the step S4, continuously stirring for 5-20 min, standing and cooling to normal temperature to obtain the silicon dioxide/water.
Through the preparation method, the various nano composite materials show ionization effect under the action of a dispersion medium by adopting a certain sequential adding and mixing mode, and the ionization degree is large, so that high-molecular anions and a plurality of small-molecular ions are formed. Macromolecular anions and micromolecular ions are firmly adsorbed on the surfaces of dispersed nano particles (such as nano materials like nano titanium dioxide) so that the ions have the same charges, and the ions with opposite charges are freely diffused into the surrounding liquid medium to form a stable diffusion layer of charged ions, namely an electric double layer, thereby completing the perfect wrapping of nano photocatalyst catalytic material particles like titanium dioxide. Ions with the same charge repel each other to form electrostatic repulsion force, so that particles such as nano pigment are effectively prevented from flocculating in an aqueous medium, and the nano particles are orderly arranged under the action of the electrostatic repulsion force to form a micro-nano structure of the multi-nano material substance with a macro tunnel effect. The micro-nano structure further forms a steric hindrance effect, so that Brown's transport can be preventedThe moving particles approach to generate a composite stabilizing effect and form a compact coating. The photocatalyst nano particles such as nano titanium dioxide and the like penetrate and fill the surface of the repair base material to form a large amount of stable photocatalyst paint film. Under the action of sunlight or lamplight, valence band electrons are subjected to interband transition, so that photoelectrons (e) are generated - ) And a cavity (h) + ) The dissolved oxygen on the surface traps electrons to form superoxide anions, and the holes oxidize hydroxide ions and water adsorbed on the surface of the nanoparticles to hydroxyl radicals. The superoxide anion and hydroxyl radical have strong oxidizability, and can oxidize most organic substances (such as benzene, formaldehyde, smoke odor and other gases) into final product CO 2 And H 2 O。
The coating has the long-acting use action mechanism that: under the action of sunlight or lamplight, valence band electrons are subjected to interband transition, so that photoelectrons (e) are generated - ) And a cavity (h) + ) The dissolved oxygen on the surface traps electrons to form superoxide anions, and the holes oxidize hydroxide ions and water adsorbed on the surface of the nanoparticles to hydroxyl radicals. Superoxide anion and hydroxyl radical have strong oxidizability, and are oxidized with most organic substances (such as benzene, formaldehyde, smoke odor and other gases) to form the final product CO 2 And H 2 And O. Meanwhile, the micro-nano structure of the multi-nano material substance with the macroscopic tunnel effect gradually releases electrons adsorbed on the surfaces of nano particle particles in the steric hindrance effect, and photocatalyst nano substances such as titanium dioxide and the like are continuously removed from the package to react with sunlight or lamplight to form micro free radical circulation, so that the effect of long-acting odor removal is achieved.
The invention also provides the application of the coating system obtained by the preparation method, and the application method is that the cured coating is constructed on the surface of an inner wall with a cement substrate or coating putty to prepare a finish paint layer; further preferably, the thickness of the finishing paint layer is 100-150 μm.
The curing and construction of the odorless coating provided by the application can be carried out by referring to the following methods:
1. curing: diluting the water-based nano interior wall odor-removing coating with 5-10% of water, mixing and stirring for 3 minutes at a stirring speed of 200 revolutions per minute.
2. The coating preparation method can be carried out by adopting a rolling coating, spraying or brushing mode.
The roll coating method comprises the following steps:
1) the surface of the workpiece is kept clean, and the cured coating can be roll-coated.
2) The roll coating method is that the coating is uniformly coated by a medium-haired roller from top to bottom (if the coating needs to be recoated or the thickness of the coating film is increased, the coating can be roll coated again after 4 hours).
The spraying method comprises the following steps:
1) the surface of the workpiece is kept clean, and the cured coating can be sprayed after being filtered by 300-mesh filter cloth.
2) The spraying method comprises the steps of uniformly spraying the surface of the workpiece by adopting a cross spraying method, standing at normal temperature for 2-3 minutes (if the film thickness of the coating needs to be increased, spraying again at the moment), and if recoating is needed, spraying each recoating time at an interval of more than 4 hours.
The brushing method comprises the following steps:
1) the surface of the workpiece is kept clean, and the cured coating can be brushed after being filtered by 300-mesh filter cloth.
2) The brushing method is that the cross brushing method is adopted to uniformly brush the surface of the workpiece in a cross manner (if the film thickness of the coating needs to be increased, the coating can be brushed again at the moment), and if the coating needs to be re-coated, each re-coating can be brushed after 4 hours of interval.
The present invention is described in further detail below with reference to examples:
example 1
The embodiment provides a water-based nano interior wall odor-removing coating which is composed of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water;
wherein the particle size of the nano titanium dioxide is 5 nm; the grain size of the nano zinc oxide is 50 nm; the particle size of the nano calcium carbonate is 80 nm; the grain diameter of the nano tin dioxide is 50 nm; the grain diameter of the nano alumina is 50 nm; the grain diameter of the nano magnesium oxide is 50 nm; the grain diameter of the nano aluminum sol is 15 nm; the defoaming agent is selected from polydimethylsiloxane, and the coupling agent is selected from octyl triethoxysilane.
The preparation method comprises the following steps:
s1, adding a polyacrylic acid salt aqueous solution and 40% of water into a container for the coating emulsion, heating to 55 ℃, and stirring and dispersing for 0.5h to obtain a master batch of a dispersion solution;
s2, sequentially adding nano titanium dioxide and nano zinc oxide into the master batch in the S1, heating to 60 ℃, stirring and dispersing for 2 hours, and cooling to room temperature to obtain a nano photocatalytic mixed master batch;
s3, sequentially adding nano tin dioxide, nano magnesium oxide, nano aluminum sol, nano calcium carbonate and organic silicon into the nano photocatalytic mixed master batch in the S2, heating to 55 ℃, stirring and dispersing for 1h, and cooling to room temperature to obtain a master batch mixture;
s4, sequentially adding methyl cellulose, ethyl cellulose, sierozem powder and a coupling agent into the master batch mixture in the S3, heating to 60 ℃ after the addition, keeping the temperature and stirring for 1 h;
and S5, adding a defoaming agent, fumed silica and the balance of water into the feed liquid obtained in the step S4, continuously stirring for 10min, standing and cooling to normal temperature to obtain the silicon dioxide/water.
Example 2
The embodiment provides a water-based nano interior wall odor-removing coating which is composed of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 38 parts of nano calcium carbonate, 1.2 parts of nano magnesium oxide, 1.2 parts of nano aluminum oxide, 2.2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.3 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 2 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 34.89 parts of water;
wherein the particle size of the nano titanium dioxide is 5 nm; the grain size of the nano zinc oxide is 50 nm; the particle size of the nano calcium carbonate is 80 nm; the grain diameter of the nano tin dioxide is 50 nm; the grain diameter of the nano alumina is 50 nm; the grain diameter of the nano magnesium oxide is 50 nm; the grain diameter of the nano aluminum sol is 15 nm; the defoaming agent is polydimethylsiloxane, and the coupling agent is octyl triethoxysilane.
The preparation method is the same as that of example 1.
Example 3
The embodiment provides a water-based nano interior wall odor-removing coating which is composed of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water;
wherein the particle size of the nano titanium dioxide is 10 nm; the grain size of the nano zinc oxide is 50 nm; the particle size of the nano calcium carbonate is 80 nm; the grain diameter of the nano tin dioxide is 50 nm; the grain diameter of the nano alumina is 50 nm; the grain diameter of the nano magnesium oxide is 50 nm; the grain diameter of the nano aluminum sol is 15 nm; the defoaming agent is selected from polydimethylsiloxane, and the coupling agent is selected from octyl triethoxysilane.
The preparation method is the same as that of example 1.
Example 4
The embodiment provides a water-based nano interior wall odor-removing coating which is composed of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water;
wherein the particle size of the nano titanium dioxide is 10 nm; the grain size of the nano zinc oxide is 50 nm; the grain size of the nano calcium carbonate is 100 nm; the grain diameter of the nano tin dioxide is 50 nm; the grain diameter of the nano alumina is 50 nm; the grain diameter of the nano magnesium oxide is 50 nm; the grain diameter of the nano aluminum sol is 15 nm; the defoaming agent is selected from polydimethylsiloxane, and the coupling agent is selected from octyl triethoxysilane.
The preparation method is the same as that of example 1.
Example 5
The embodiment provides a water-based nano interior wall odor-removing coating which is composed of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of ash calcium powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water;
wherein the particle size of the nano titanium dioxide is 5 nm; the grain size of the nano zinc oxide is 50 nm; the grain size of the nano calcium carbonate is 100 nm; the grain diameter of the nano tin dioxide is 50 nm; the grain diameter of the nano alumina is 50 nm; the grain diameter of the nano magnesium oxide is 50 nm; the grain diameter of the nano aluminum sol is 15 nm; the defoaming agent is selected from polydimethylsiloxane, and the coupling agent is selected from octyl triethoxysilane.
The preparation method is the same as that of example 1.
Comparative example 1
The formula and the preparation method of the embodiment 1 are adopted, and the difference is that the nano calcium carbonate in the formula and the preparation method of the coating is replaced by common calcium carbonate (with the particle size of 1-5 mu m).
Comparative example 2
The formulation and preparation method of example 1 were used except that the aqueous solution of polyacrylic acid salt in the formulation and preparation method of the coating was replaced with an aqueous solution of sodium hexametaphosphate at a mass concentration of 40%.
Comparative example 3
The formulation and preparation method of example 1 were used except that 1 part by mass of the polyacrylate aqueous solution was used in the formulation and preparation method of the coating.
Comparative example 4
The coating formulation of example 1 was followed and the coating preparation was carried out as follows:
s1, adding the coating emulsion into a container by using a polyacrylic acid salt aqueous solution and water, heating to 60 ℃, and stirring and dispersing for 0.5h to obtain a master batch of a dispersion solution;
s2, adding nano titanium dioxide, nano zinc oxide, nano tin dioxide, nano magnesium oxide, nano aluminum sol, nano calcium carbonate, organic silicon, methyl cellulose, ethyl cellulose, ash calcium powder and a coupling agent into the master batch in the S1, heating to 60 ℃, stirring and dispersing for 3 hours, and cooling to room temperature;
and S3, adding the defoaming agent and the fumed silica into the feed liquid obtained in the step S2, continuously stirring for 10min, standing and cooling to normal temperature to obtain the silicon dioxide/silicon dioxide/silicon dioxide/silicon.
Test example 1
According to the method in GB 18582-.
Test example 2
1) Stirring with a stirring rod, checking whether the coating has precipitation and agglomeration phenomena, and observing the state of the coating in the container;
2) the coatings obtained in all examples and comparative examples were cured separately by the following method: diluting the water-based nano interior wall odor-free coating with 8% of water, mixing and stirring for 3 minutes for curing, wherein the stirring speed is 200 revolutions per minute, and then testing and evaluating the coating workability, the coating appearance, the alkali resistance and the washing resistance according to a testing method of a finish paint in GB/T9756-2018 synthetic resin emulsion interior wall coating, wherein the results are shown in the following table 1:
table 1: examples and comparative examples coating test results
The odor-free coatings in the examples 1 to 5 can meet the general requirements of the interior wall coatings, the coatings in the comparative examples 2 to 4 have poor application performance, and the surfaces of the coating films obtained by secondary application are uneven. Comparing example 1 with comparative example 1, the coating formulation of the present invention using nano calcium carbonate can have better wash and alkali resistance. In comparative example 1 and comparative example 2, the kind of the dispersant has a significant effect on the interior wall coating, which affects not only the mixing uniformity of the coating but also the workability of the coating, and the resulting coating film has a severe powdering phenomenon.
Test example 3
The coating obtained in all the examples and the comparative examples is further tested for formaldehyde removal effect, and the specific test method is that after the side walls in 1 closed space of 2m 1m are coated with nano odor-removing coating (coating thickness is 100-150 μm), after the coating film is dried, a formaldehyde gas sample with concentration of 0.12mg/m is slowly injected 3 (according to the GB/T1883-2002 standard requirement, the indoor formaldehyde content range is 0.08-0.12 mg/m 3 ) And measuring the concentration of formaldehyde in the test chamber after 168 hours. The measuring instrument is a British PPM400ST portable formaldehyde detector, the response time of the instrument is 3s, and the precision is 0.001mg/m 3 . After the test, the test chamber is placed in a normal indoor environment for 12 months, and formaldehyde gas is injected again until the concentration of formaldehyde in the test chamber is 0.12mg/m 3 And on the left and right sides, the formaldehyde concentration in the test box is measured for 168 h. The results of the tests are shown in Table 2 below:
table 2: formaldehyde purifying effect
The coating in the embodiments 1 to 5 of the invention has a good purification effect on formaldehyde, and can still maintain a good purification effect after 12 months. Comparative example 1 the initial formaldehyde cleaning performance of the coating using the ordinary calcium carbonate was poor. The initial formaldehyde purification effect of the coatings of comparative examples 2-4 was good, but the purification effect declined much after 12 months.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (10)
1. The water-based nano interior wall odor-removing coating is characterized by comprising the following raw materials in parts by weight:
2. the water-based nano interior wall odor-removing coating as claimed in claim 1, wherein the nano titanium dioxide has a particle size of 5-10 nm; preferably, the particle size of the nano titanium dioxide is 5 nm.
3. The water-based nano interior wall odor-removing coating as claimed in claim 1 or 2, wherein the particle size of the nano zinc oxide is 40-60 nm; preferably, the particle size of the nano zinc oxide is 50 nm.
4. The water-based nano interior wall odor-removing coating material as claimed in claim 1, wherein the coating material further comprises 1-2 parts of nano tin dioxide.
5. The water-based nano interior wall odor-removing coating material as claimed in claim 4, wherein the nano tin dioxide has a particle size of 50 nm.
6. The water-based nano interior wall odor-removing coating as claimed in claim 1, wherein the nano calcium carbonate has a particle size of 60 to 100 nm; preferably, the particle size of the nano calcium carbonate is 80 nm.
And/or the particle size of the nano alumina is 40-60 nm; preferably, the particle size of the nano alumina is 50 nm;
and/or the particle size of the nano magnesium oxide is 50 nm;
and/or the particle size of the nano aluminum sol is 10-15 nm.
7. The water-based nanometer interior wall odor-removing coating material as claimed in claim 1, wherein the cellulose ether comprises 0.9-1.1 parts of methyl cellulose and 0.9-1.1 parts of ethyl cellulose.
8. The water-based nano interior wall odor-removing coating material as claimed in claim 1, further comprising 0.01-0.08 parts of an antifoaming agent;
and/or 0.18-0.22 parts of organic silicon;
and/or 0.8-1.2 parts of a coupling agent.
9. The water-based nano interior wall odor-removing coating material as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 4-6 parts of nano titanium dioxide, 2-4 parts of nano zinc oxide, 38-42 parts of nano calcium carbonate, 0.8-1.2 parts of nano magnesium oxide, 0.8-1.2 parts of nano aluminum oxide, 1.8-2.2 parts of nano aluminum sol, 0.9-1.1 parts of methyl cellulose, 0.9-1.1 parts of ethyl cellulose, 0.3-0.5 part of polyacrylate water solution, 0.8-1.2 parts of gas phase method silicon dioxide, 7-9 parts of ash calcium powder, 1-2 parts of nano tin dioxide, 0.01-0.08 part of defoaming agent, 0.18-0.22 part of organic silicon, 0.8-1.2 parts of coupling agent and 30-35 parts of water;
preferably, the feed consists of the following raw materials in parts by weight: 5 parts of nano titanium dioxide, 3 parts of nano zinc oxide, 41 parts of nano calcium carbonate, 1 part of nano magnesium oxide, 1 part of nano aluminum oxide, 2 parts of nano aluminum sol, 1 part of methyl cellulose, 1 part of ethyl cellulose, 0.4 part of polyacrylate aqueous solution, 1 part of gas phase method silicon dioxide, 8 parts of sierozem powder, 1.5 parts of nano tin dioxide, 0.01 part of defoaming agent, 0.2 part of organic silicon, 1 part of coupling agent and 32.89 parts of water.
10. The preparation method of the water-based nano interior wall odor-removing coating material as claimed in claim 9, characterized by comprising the following steps:
s1, adding a polyacrylate water solution and 30-50% of water into a container, heating to 50-60 ℃, and stirring and dispersing for 0.5-1 h to obtain a master batch of a dispersion solution;
s2, sequentially adding nano titanium dioxide and nano zinc oxide into the master batch in the S1, heating to 50-70 ℃, stirring and dispersing for 1-3 hours, and cooling to room temperature to obtain a nano photocatalytic mixed master batch;
s3, sequentially adding nano tin dioxide, nano magnesium oxide, nano aluminum sol, nano calcium carbonate and organic silicon into the nano photocatalytic mixed master batch in the S2, heating to 50-60 ℃, stirring and dispersing for 0.5-1 h, and cooling to room temperature to obtain a master batch mixture;
s4, sequentially adding methyl cellulose, ethyl cellulose, sierozem powder and a coupling agent into the master batch mixture in the S3, heating to 50-70 ℃ after adding, preserving heat and stirring for 0.5-1 h;
and S5, adding the defoaming agent, the fumed silica and the balance of water into the feed liquid obtained in the step S4, continuously stirring for 5-20 min, standing and cooling to normal temperature to obtain the silicon dioxide/water.
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