CN114015319A

CN114015319A - Formaldehyde-resistant self-cleaning wall paint and preparation method thereof

Info

Publication number: CN114015319A
Application number: CN202111305174.5A
Authority: CN
Inventors: 符思; 廖位红; 梁巧敏; 傅国景
Original assignee: Guangzhou Hotech Building Materials Co ltd
Current assignee: Guangzhou Hotech Building Materials Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-02-08
Anticipated expiration: 2041-11-05
Also published as: CN114015319B

Abstract

The invention discloses a formaldehyde-resistant self-cleaning wall paint and a preparation method thereof, wherein the formaldehyde-resistant self-cleaning wall paint comprises the following raw materials: the wall paint is characterized by comprising acrylate monomers, fusion chromo acid, a dispersing agent, a defoaming agent, propylene glycol, a film forming auxiliary agent, diatomite, a guanidine-containing hydrophilic compound, a thickening agent, deionized water, a pH regulator and a filler, wherein the fusion chromo acid is added into the wall paint to serve as a formaldehyde resisting agent, so that formaldehyde in contact with a wall surface can be solidified through a chemical reaction; the hydrophilic compound containing guanidine is introduced into the polymer in the emulsion polymerization process of the acrylate monomer, so that the hydrophilicity of the polymer is increased by the contained polyethylene glycol group, and the contained biguanide group can kill biomass, thereby realizing excellent formaldehyde resistance and self-cleaning performance. The method is simple, does not need a special reaction process, and can be realized by emulsion polymerization.

Description

Formaldehyde-resistant self-cleaning wall paint and preparation method thereof

Technical Field

The invention belongs to the field of coatings, and particularly relates to a formaldehyde-resistant self-cleaning wall paint and a preparation method thereof.

Background

Formaldehyde is a colorless and volatile harmful gas, can continuously stimulate human skin, respiratory tract mucous membranes, histiocytes and the like, is one of potential strong mutagenic substances, and is identified as a carcinogenic and teratogenic substance. The formaldehyde in the room is mainly from furniture, floors, paints, cleaning agents and the like which are commonly used in our lives, and the binder used in the preparation process of the products contains formaldehyde which slowly volatilizes at a later stage, so that the formaldehyde in the room reaches a certain concentration, and the newly-decorated room is often higher in formaldehyde content. And the release period of formaldehyde can be as long as several years to ten years, and is difficult to remove in a short time, so that the formaldehyde is a main pollutant of indoor air.

The existing treatment methods for indoor formaldehyde are not as follows: formaldehyde is diffused and diluted through ventilation, and physical adsorption is carried out through porous substances such as activated carbon, molecular sieve and the like; carrying out biological adsorption through plants; carrying out chemical decomposition by using a formaldehyde scavenger; the adsorption purification is carried out by an air purification electric appliance, and the methods have respective advantages and disadvantages.

The traditional decorative material is one of sources of formaldehyde, the use of the formaldehyde in the decorative material is reduced, and additives are added into the coating to realize the curing and decomposition of the formaldehyde, so that the method is a method. Some coatings have appeared on the market. Formaldehyde is adsorbed by adding a porous substance into the coating or is decomposed by adding a titanium dioxide substance as a photocatalyst, but the formaldehyde is not completely eliminated by physical adsorption, and the adsorbed formaldehyde is easily volatilized again under the conditions of temperature and the like; the efficiency of photocatalytic decomposition is also extremely low. Therefore, the formaldehyde curing removal by the decorative coating is still further improved.

Disclosure of Invention

In order to overcome the defects of the prior art, the first object of the invention is to provide a formaldehyde-resistant self-cleaning wall paint, which is used for solving the problem that formaldehyde in a room is difficult to cure and remove. The formaldehyde self-cleaning paint has the advantages of large action area, long action time, capability of adsorbing and curing formaldehyde to reduce the indoor formaldehyde content, hydrophilicity and biocidal property, and self-cleaning effect, so that the formaldehyde self-cleaning paint can be used as indoor and outdoor wall paint, and is particularly suitable for humid climates in the south.

The second purpose of the invention is to provide a preparation method of the formaldehyde-resistant self-cleaning wall paint.

The first purpose of the invention can be achieved by adopting the following technical scheme:

the formaldehyde-resistant self-cleaning wall paint is characterized by comprising the following raw materials in parts by weight:

35-45 parts of acrylate monomer, 0.5-1 part of fusion chromophoric acid, 0.4-0.7 part of dispersant, 0.4-0.6 part of defoaming agent, 2-4 parts of propylene glycol, 1-1.5 parts of film-forming assistant, 10-15 parts of diatomite, 0.5-1 part of hydrophilic compound containing guanidine, 0.4-0.6 part of thickening agent, 25-35 parts of deionized water, 0.1-0.3 part of pH regulator and 10-15 parts of filler.

Preferably, the acrylate monomer is one or a combination of more than two of alkyl methacrylate, allyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, vinyl methacrylate, 2-hydroxyethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate.

Preferably, the fusion chromoacid is produced by electrochemical polymerization.

Preferably, the guanidine-containing hydrophilic compound has the structure of formula I:

wherein A and B are alkyl groups having 1 to 4 carbon atoms.

Preferably, the dispersant is an organic dispersant, and is one or a combination of two or more selected from sodium dodecyl sulfate, fatty acid polyglycol ester and polyoxyethylene alkyl ether.

Preferably, the film forming aid is one or a combination of more than two of dipropylene glycol monobutyl ether, hexanediol butyl ether acetate and dodecyl alcohol ester.

Preferably, the thickener is one or a combination of two or more of cellulose derivatives, hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose.

Preferably, the filler is one or a composition of more than two of heavy calcium carbonate, kaolin and talcum powder; the pH regulator is 2-amino-2-methyl-1 propanol.

The second purpose of the invention can be achieved by adopting the following technical scheme:

a preparation method of formaldehyde-resistant self-cleaning wall paint comprises the following steps:

s1, heating a mixture containing water, an initiator and a dispersing agent, and adding an acrylate monomer and a hydrophilic compound containing guanidine under continuous stirring for emulsion polymerization reaction to obtain a polymerization emulsion;

s2, adding fusion chromophoric acid, a defoaming agent, propylene glycol and a film-forming aid into the polymerization emulsion, and stirring to obtain a mixed solution;

s3, uniformly stirring the filler, the diatomite and the deionized water, adding the filler, the diatomite and the deionized water into the mixed solution obtained in the step S2, and stirring to obtain a mixed material;

and S4, adding a thickening agent and a pH regulator into the mixture obtained in the step S3, and uniformly stirring to obtain the formaldehyde-resistant self-cleaning wall paint.

Preferably, the temperature of the emulsion polymerization reaction in the step S1 is 50-95 ℃, the stirring speed is 200-300r/min, and the reaction time is 1.5-6 h; the stirring speed in the step S2 is 500-600 r/min; the stirring speed in steps S3 and S4 is 900-.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the self-cleaning wall paint capable of resisting formaldehyde, the fusion chromophoric acid is added into the wall paint to serve as the formaldehyde resisting agent, formaldehyde in contact with a wall surface can be cured through a chemical reaction, and therefore the effect of curing, cleaning and resisting formaldehyde is achieved; and the fusion chromophoric acid can interact with amino groups on the polymer chain to enable the polymer to be crosslinked, so that the technological performance of the wall paint is improved.

2. By participating the guanidine-containing hydrophilic compound in the polymerization reaction in the emulsion polymerization process of the acrylate monomer, a structure containing a branched chain is successfully introduced into the acrylate polymer, the hydrophilicity of the polymer can be increased by the polyethylene glycol group contained in the branched chain, and the contained biguanide group can kill the biomass, so that the hydrophilicity and the biomass killing performance of the wall paint are realized.

3. The preparation method of the formaldehyde-resistant self-cleaning wall paint has simple process, and can be realized by relying on emulsion polymerization reaction without a special reaction process although the functional compound with a plurality of functional groups is introduced.

Detailed Description

The invention will be further described with reference to specific embodiments:

in order to remove indoor formaldehyde for a long time and solve the problems that dirt is easy to adhere to the wall surface and biomass is easy to breed in the humid weather in the south, the formaldehyde is cured by the wall paint used in the decoration of the wall surface, the dirt is self-cleaned, and the biomass is killed, so that the method is a feasible method. Therefore, the invention provides the formaldehyde-resistant self-cleaning wall paint, which is used for solving the problem that the indoor formaldehyde is difficult to cure and remove. The formaldehyde self-cleaning paint has the advantages of large action area, long action time, capability of adsorbing and curing formaldehyde to reduce the indoor formaldehyde content, hydrophilicity and biocidal property, and self-cleaning effect, so that the formaldehyde self-cleaning paint can be used as indoor and outdoor wall paint, and is particularly suitable for humid climates in the south.

An anti-formaldehyde self-cleaning wall paint comprises the following raw materials in parts by weight:

The allochroic acid is a reagent capable of reacting with formaldehyde to change color, but hydroxyl on the allochroic acid is easily oxidized, so that the activity of the allochroic acid reacting with the formaldehyde is influenced; the invention polymerizes the chromotropic acid by an electrochemical polymerization synthesis method, and the formed fusion chromotropic acid not only has enhanced oxidation resistance, but also can not generate obvious color change after the formaldehyde reacts. Therefore, the possibility is provided for long-acting formaldehyde curing, on one hand, the formaldehyde can not be oxidized and kept for long-time formaldehyde reactivity, and on the other hand, the formaldehyde can not change color after reacting with formaldehyde and influence the color of the wall surface.

The fusion chromotropic acid can be prepared by a known electrochemical polymerization method, and reacts according to a conventional electrochemical polymerization reaction process by using a chromotropic acid aqueous solution as an electrolyte, sodium hydroxide as a supporting electrolyte and a glassy carbon electrode as a working electrode.

According to the invention, 10-15 parts of diatomite is added, the diatomite is a porous substance, and is mixed with the film forming substance and the fusion chromophoric acid, so that the specific surface area of the surface of the wall paint can be increased, the fusion chromophoric acid and the acrylate film forming substance are attached to the pores, the formaldehyde on the surface of the wall paint can be better adsorbed, and a place for curing reaction is provided. Meanwhile, the diatomite can shorten the drying time, enhance the hand feeling of the formed film, and increase the wear resistance, scratch resistance and permeability of the film.

Preferably, the acrylate monomer is one or a combination of more than two of alkyl methacrylate, allyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, vinyl methacrylate, 2-hydroxyethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate. The acrylate compound is a good monomer of water-soluble water paint, can form good film-forming polymer through emulsion polymerization, and because the double bond and carboxyl group on the acrylic acid can react with various substances, different compounds with functional groups can be combined and introduced into the acrylic polymer.

wherein A and B are alkyl groups having 1 to 4 carbon atoms.

A guanidine-containing hydrophilic compound comprising mainly two functional groups, one of which is a biguanide group, killing microorganisms; the other is an amino-terminated polyethylene glycol group, and the polyethylene glycol unit contributes to hydrophilicity because the ether bond of polyethylene glycol forms a hydrogen bond with water molecule. Wherein the functional group is linked to the amino acid body, which is serine, or other amino acids with terminal hydroxyl group such as threonine, the carboxyl group of the amino acid is linked to the olefin group to provide double bond for addition with other compounds, for example, ethylene group, and biguanide group and amino-terminated polyethylene glycol group are introduced into the acrylate polymer by polymerization of ethylene double bond and acrylate. The terminal hydroxyl group of the amino acid is linked to a phosphorus compound, and a biguanide group and an amino-terminated polyethylene glycol group are linked to the amino acid by a covalent bond on the phosphorus, so that the guanidine-containing hydrophilic compound has a biguanide and a polyethylene glycol group and can also undergo a polymerization reaction with an acrylate. In addition, the hydrophilicity of the compound can be adjusted by adjusting the polymerization degree of the polyethylene glycol and the substituent on the amino end capping group. Preferably, the polymerization degree of the polyethylene glycol is 1-20, and the substituent on the amino end capping group is alkyl with 1-4 carbon atoms, so that the hydrophilicity of the compound is sufficiently improved.

Surfaces with hydrophilic wall finishes allow water to spread in thin layers, sweeping dirt from the surface as the water thins and drips off. This type of "self-cleaning" can keep the coating clean without extensive cleaning by the customer. A hydrophilic surface will allow water to coat the surface and either solvate or even carry away soil molecules, which is even more advantageous in southern wet weather. Humid weather is more prone to the growth of biomass such as bacteria, while biguanides can bind themselves into the cell membranes of bacteria, causing DNA damage and ultimately killing of microorganisms.

Preferably, the dispersant is an organic dispersant, and is one or a combination of two or more selected from sodium dodecyl sulfate, fatty acid polyglycol ester and polyoxyethylene alkyl ether. The dispersing agent can make organic compound be better dissolved in water and form uniform emulsion with water, and for inorganic substances of inorganic filler and diatomite, they can be promoted to be dispersed and mixed in the acrylic ester water-soluble emulsion to reach stable state.

Preferably, the film forming aid is one or a combination of more than two of dipropylene glycol monobutyl ether, hexanediol butyl ether acetate and dodecyl alcohol ester. Alcohol esters and ethers are slow-evaporating solvents with a certain solubility in the polymer phase, and their addition can promote the film formation of wall finishes under varying atmospheric conditions. They can also act as temporary plasticizers, allowing film formation at temperatures below the glass transition temperature of the system. After film formation, the coalescent can slowly diffuse to the surface and evaporate, increasing the mechanical properties of the film such as hardness and blocking resistance.

Preferably, the thickener is one or a combination of two or more of cellulose derivatives, hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose. Cellulose derivatives contain abundant hydroxyl groups that can form multiple hydrogen bonds with acrylic polymers, causing chain entanglement, looping and/or swelling to achieve the desired viscosity.

The acrylic ester and hydrophilic compound containing guanidine are firstly subjected to emulsion polymerization reaction to generate a film-forming polymer, then fusion chromophoric acid is added, so that the fusion chromophoric acid can interact with the film-forming polymer, for example, amino on the film-forming polymer is combined with hydroxyl of the fusion chromophoric acid, so that the fusion chromophoric acid exists in the wall finish emulsion and the film-forming polymer, and other additives and auxiliaries are added, so that the existing process is not required to be changed greatly, and the industrial applicability is strong.

Example 1: preparation of hydrophilic compounds containing guanidine

Dissolving phosphorus trichloride in tetrahydrofuran solution, cooling to 0 deg.C, slowly adding dimethylamino-terminated PEG-600 into the solution, stirring the solution at 5 deg.C for 5min, adding 2, 6-dimethylpyridine, and stirring at 5 deg.C for reaction; simultaneously adding serine into a tetrahydrofuran solution, adding 2, 6-dimethylpyridine, stirring, adding the mixed solution into the reaction solution containing phosphorus trichloride and PEG, stirring for reaction at 5 ℃, adding aminopropylbiguanide into the reaction solution after reacting for 2 hours, then reducing the temperature to 0 ℃, adding sodium bromide, keeping the temperature at 0 ℃, after the addition is finished, heating the temperature to room temperature at room temperature, and stirring for reaction. Detecting the reaction completion by TLC, adding sodium metabisulfite to consume unreacted oxidant, adding ethyl acetate, mixing, washing with saturated sodium chloride water solution, separating, drying organic layer with anhydrous magnesium sulfate, filtering, concentrating, stirring with ethyl acetate, diluting, and filtering at-10 deg.C to obtain intermediate product.

The intermediate product was charged with ethylene, oxygen and catalyst in a reactor, which was heated to 150 ℃ and washed off with ethyl acetate and evaporated to dryness to give a hydrophilic guanidine-containing compound. Wherein the catalyst is a silica catalyst attached with palladium and gold.

Example 2:

heating a mixture of 15 parts by weight of water, 1 part of ammonium persulfate and 0.4 part of sodium dodecyl sulfate to 50 ℃, adding 15 parts of methyl methacrylate, 10 parts of butyl acrylate and 10 parts of 2-hydroxypropyl methacrylate under continuous stirring, and carrying out emulsion polymerization reaction on 1 part of the guanidine-containing hydrophilic compound prepared in example 1 for 6 hours under the stirring speed of 200r/min to obtain a polymerization emulsion; adding 0.5 part of fusion chromophoric acid, 0.4 part of defoaming agent, 2 parts of propylene glycol and 1 part of dodecyl alcohol ester into the polymerization emulsion, and stirring at a stirring speed of 500r/min to obtain a mixed solution; 5 parts of kaolin, 5 parts of coarse whiting, 10 parts of diatomite and 10 parts of deionized water are uniformly stirred, added into the mixed solution and stirred at 900r/min to obtain a mixed material; and measuring the pH, and finally adding 0.4 part of hydroxyethyl cellulose and 0.1 part of 2-amino 2-methyl-1 propanol into the mixture, and uniformly stirring to obtain the formaldehyde-resistant self-cleaning wall paint.

Example 2:

heating a mixture of 10 parts by weight of water, 0.5 part of benzoyl peroxide and 0.7 part of polyoxyethylene alkyl ether to 95 ℃, adding 20 parts of methyl methacrylate, 15 parts of vinyl methacrylate and 10 parts of 2-ethylhexyl acrylate under continuous stirring, and 0.5 part of the guanidine-containing hydrophilic compound prepared in example 1, and carrying out emulsion polymerization for 1.5 hours under the stirring speed of 300r/min to obtain a polymerization emulsion; adding 1 part of fusion chromophoric acid, 0.6 part of defoaming agent, 4 parts of propylene glycol and 1.5 parts of dipropylene glycol monobutyl ether into the polymerization emulsion, and stirring at a stirring speed of 600r/min to obtain a mixed solution; uniformly stirring 5 parts of kaolin, 5 parts of heavy calcium, 5 parts of talcum powder, 15 parts of diatomite and 25 parts of deionized water, adding the mixture into the mixed solution, and stirring at 1200r/min to obtain a mixture; and measuring the pH, adding 0.6 part of methyl cellulose and 0.3 part of 2-amino-2-methyl-1-propanol into the mixture, and uniformly stirring to obtain the formaldehyde-resistant self-cleaning wall paint.

Example 3:

heating a mixture of 20 parts by weight of water, 1.5 parts of tert-butyl hydroperoxide and 0.55 part of fatty acid polyglycol ester to 70 ℃, adding 10 parts of 2-hydroxyethyl methacrylate, 10 parts of allyl methacrylate and 20 parts of butyl acrylate under continuous stirring, and carrying out emulsion polymerization reaction on 0.75 part of the guanidine-containing hydrophilic compound prepared in example 1 at a stirring speed of 250r/min for 4 hours to obtain a polymerization emulsion; adding 0.75 part of fusion chromophoric acid, 0.5 part of defoaming agent, 3 parts of propylene glycol and 1.25 parts of hexanediol butyl ether acetate into the polymerization emulsion, and stirring at a stirring speed of 550r/min to obtain a mixed solution; uniformly stirring 7 parts of coarse whiting, 8 parts of talcum powder, 12.5 parts of diatomite and 10 parts of deionized water, adding the mixture into the mixed solution, and stirring at 1050r/min to obtain a mixture; and measuring the pH, and finally adding 0.5 part of carboxymethyl cellulose and 0.2 part of 2-amino-2-methyl-1 propanol into the mixture, and uniformly stirring to obtain the formaldehyde-resistant self-cleaning wall paint.

Comparative example 1

Comparative example 1 differs from example 2 in that no hydrophilic compound containing guanidine was added and the other ingredients and procedure were the same.

Comparative example 2

Comparative example 2 differs from example 2 in that no fusion chromophoric acid was added, and the other ingredients and procedures were the same.

Comparative example 3

Comparative example 3 differs from example 1 in that no diatomaceous earth was added and the other ingredients and procedures were the same.

The invention discloses a performance test of formaldehyde-resistant self-cleaning wall paint, which comprises the following steps:

evaluation of hydrophilic Properties

The paints comprising examples 1 to 3 and comparative examples 1 to 3 were coated on the glass surface and dried at room temperature. A drop of water was dropped on the painted glass, and 6 samples were measured by a contact angle measuring instrument, in which the contact angles of examples 1 to 3 and comparative example 2 were similar, and for complete wetting, the contact angle of comparative example 1 was 53 degrees, showing partial wetting, and the contact angle of comparative example 3 was 6 to 8 degrees, showing slightly worse hydrophilicity than those of examples 1 to 3.

Antifouling test

The wall finishes of examples 1-3 and comparative examples 1-3 were applied to one decimeter square of a wall surface and, after the coating was dried, the surface was exposed to running water for one month. At the end of the cycle, the wall surface was examined for visible flaking of paint and growth of organisms such as algae. The wall surfaces of examples 1-3 and comparative examples 2-3 did not contain algae, while the wall surface of comparative example 1 had little algae growth.

Formaldehyde resistance test

When the wall finishes of the examples 1 to 3 and the comparative examples 1 to 3 are tested according to the building material industry standard JCT 1074-2008 indoor air purification function coating material purification performance, the formaldehyde purification efficiencies of the samples of the examples 1 to 3 and the comparative example 1 are respectively 95.1%, 94.8%, 95.3% and 94.5%, the formaldehyde purification efficiency of the sample of the comparative example 2 is only 7.1%, and the formaldehyde purification efficiency of the sample of the comparative example 3 is 88.9%. Therefore, the capability of fusing chromophoric acid to cure formaldehyde in the wall paint can be seen, and the diatomite has a certain formaldehyde adsorption effect due to the porosity, and the adsorption-curing mutual matching is realized by combining the chromophoric acid, so that the formaldehyde resistance efficiency of the wall paint is higher.

Mechanical property detection

The wall paints of the examples 1-3 and the comparative examples 1-3 are subjected to physical and mechanical property tests according to GB/T9755-2001 synthetic resin emulsion exterior wall coating and GB/T9756-2001 synthetic resin emulsion interior wall coating, and the wall paints of the examples 1-3 and the comparative examples 1-3 have various properties far exceeding the national technical indexes.

Therefore, the fusion chromophoric acid is added into the wall paint to serve as the formaldehyde resisting agent, formaldehyde in contact with the wall surface can be solidified through chemical reaction, the formaldehyde solidifying and cleaning effect is achieved, the guanidine-containing hydrophilic compound participates in the polymerization reaction in the emulsion polymerization process of the acrylate monomer, the structure containing the branched chain is successfully introduced into the acrylate polymer, the hydrophilicity of the polymer can be increased through the polyethylene glycol group contained in the branched chain, and the contained biguanide group can kill the biomass. Through performance detection, the wall paint disclosed by the invention has outstanding performances in formaldehyde resistance, hydrophilicity and antifouling property.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. The formaldehyde-resistant self-cleaning wall paint is characterized by comprising the following raw materials in parts by weight:

2. The formaldehyde-resistant self-cleaning wall paint as claimed in claim 1, wherein the acrylate monomer is one or a combination of more than two of alkyl methacrylate, allyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, vinyl methacrylate, 2-hydroxyethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate.

3. The formaldehyde-resistant self-cleaning wall paint as claimed in claim 1, wherein the fusion chromophoric acid is prepared by electrochemical polymerization.

4. The formaldehyde-resistant self-cleaning wall paint according to claim 1, wherein the guanidine-containing hydrophilic compound has the structure of formula I:

wherein A and B are alkyl groups having 1 to 4 carbon atoms.

5. The formaldehyde-resistant self-cleaning wall paint as claimed in claim 1, wherein the dispersant is an organic dispersant selected from one or more of sodium dodecyl sulfate, fatty acid polyglycol ester and polyoxyethylene alkyl ether.

6. The formaldehyde-resistant self-cleaning wall paint as claimed in claim 1, wherein the film-forming aid is one or a combination of more than two of dipropylene glycol monobutyl ether, hexylene glycol butyl ether acetate and dodecyl alcohol ester.

7. The formaldehyde-resistant self-cleaning wall paint as claimed in claim 1, wherein the thickener is one or a combination of more than two of cellulose derivatives, hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose.

8. The formaldehyde-resistant self-cleaning wall paint as claimed in claim 1, wherein the filler is one or a combination of more than two of heavy calcium carbonate, kaolin and talcum powder; the pH regulator is 2-amino-2-methyl-1 propanol.

9. A method of preparing the formaldehyde-resistant self-cleaning wall paint of any one of claims 1-8, comprising the steps of:

s1, preheating a mixture containing water, an initiator and a dispersing agent, adding an acrylate monomer and a hydrophilic compound containing guanidine under the stirring condition, and carrying out emulsion polymerization reaction to obtain a polymerization emulsion;

s2, adding fusion chromophoric acid, a defoaming agent, propylene glycol and a film-forming aid into the polymerization emulsion obtained in the step S1, and uniformly stirring to obtain a mixed solution;

s3, uniformly stirring the filler, the diatomite and the deionized water, adding the filler, the diatomite and the deionized water into the mixed liquid obtained in the step S2, and uniformly stirring to obtain a mixed material;

10. The method for preparing the formaldehyde-resistant self-cleaning wall paint as claimed in claim 9, wherein the temperature of the emulsion polymerization reaction in the step S1 is 50-95 ℃, the stirring speed is 200-300r/min, and the reaction time is 1.5-6 h; the stirring speed in the step S2 is 500-600 r/min; the stirring speed in the steps S3 and S4 is 900-.