CN113088146A

CN113088146A - Monoatomic coating with formaldehyde removing function and preparation method thereof

Info

Publication number: CN113088146A
Application number: CN202110353126.7A
Authority: CN
Inventors: 赵超; 王晶; 黄红锋; 吴宇波; 邹俊; 童助雄
Original assignee: Shenzhen Monatomic Materials Co ltd; Liankehua Technology Co Ltd
Current assignee: Shenzhen Monatomic Materials Co ltd; Liankehua Technology Co Ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-07-09
Anticipated expiration: 2041-04-01
Also published as: CN113088146B

Abstract

The application relates to the field of functional coatings, and particularly discloses a monoatomic coating with a formaldehyde removing function and a preparation method thereof. A monoatomic coating with a formaldehyde removing function is prepared from the following raw materials in percentage by mass: 18-22% of acrylic emulsion, 1-2% of defoaming agent, 2-5% of dispersing agent, 5-10% of propylene glycol, 1-2% of film-forming assistant, 4-8% of thickening agent, 0.2% of pH regulator, 2-5% of formaldehyde-removing single-atom catalyst, 30-40% of filler powder and 17-28% of deionized water. The formaldehyde-removing monatomic catalyst which is independently researched and developed is used, other auxiliary conditions are not needed, the formaldehyde can be efficiently absorbed under the indoor conditions of normal temperature and normal pressure and no light, the formaldehyde is catalytically oxidized and decomposed into harmless carbon dioxide and water, secondary pollution is avoided, the lasting action time is long, the formaldehyde is not consumed, the paint has the advantages of efficiently absorbing the formaldehyde, removing the formaldehyde for a long time, being tasteless, nontoxic, green and environment-friendly, and the defects that the formaldehyde is easily volatilized and is not degraded in the traditional paint can be overcome.

Description

Monoatomic coating with formaldehyde removing function and preparation method thereof

Technical Field

The application relates to the field of functional coatings, in particular to a monoatomic coating with a formaldehyde removing function and a preparation method thereof.

Background

Along with the improvement of economic level, the living standard of people is obviously improved, and the requirement on healthy life is higher and higher. In housing, people have higher and higher requirements on living environment, and fashionable decoration and new home furnishing become targets pursued by many people. However, the use of these finishing materials and furniture in the market produces formaldehyde, a hazardous substance. The formaldehyde has great harm to human health, is a carcinogenic and teratogenic substance recognized by the world health organization, particularly for pregnant women, old people and children, and is also a main inducing factor of leukemia. The content of the active component in the indoor air environment is more than 0.08mg/m³The formaldehyde concentration can cause red eyes, itchy eyes, discomfort or pain in throat, hoarseness, sneezing, chest distress, asthma, dermatitis and other diseases. The indoor formaldehyde mainly comes from inferior furniture, functional paint, indoor luxury decoration and the like, and the formaldehyde contained in the materials can be released for years, thereby seriously harming the health and the life of human beings all the time. Therefore, the removal of indoor formaldehyde is one of the main tasks of improving indoor air environment.

At present, the methods for removing aldehydes indoors on the market include adsorption, plasma, photocatalysis, and the like. The adsorption method mainly adopts a porous material to physically adsorb formaldehyde, but the adsorption is easily saturated and formaldehyde can be released secondarily. The plasma purification technology can decompose formaldehyde molecules at low temperature, but has the biggest defects that the release of by-product ozone in the product is difficult to control, and secondary pollution is easy to generate. Light (es)The catalytic technique is TiO₂The nano-scale catalyst is a raw material loaded on a specific carrier, and formaldehyde molecules are degraded under an ultraviolet light source, however, the preparation process of the material is complex, the technical difficulty is high, and if the nano-scale catalyst is applied to indoor formaldehyde removal, an ultraviolet lamp needs to be installed for irradiation, so that the production cost is high, and the nano-scale catalyst is not easy to popularize and use.

Aiming at the defects of the prior art, the inventor develops a monoatomic coating with a formaldehyde removal function in order to meet the treatment requirement of the market on indoor formaldehyde.

Disclosure of Invention

In order to solve the problems in the related art, the application provides a monoatomic coating with a formaldehyde removal function and a preparation method thereof.

In a first aspect, the application provides a monoatomic coating with a formaldehyde removal function, which adopts the following technical scheme: a monoatomic coating with a formaldehyde removing function is prepared from the following raw materials in parts by weight: 15.0-25.0% of acrylic emulsion, 1.0-2.0% of defoaming agent, 1.0-5.0% of dispersing agent and 3.0-15.0% of propylene glycol. 0.5-2.0% of film-forming additive, 2.0-8.0% of thickening agent, 0.1-0.5% of pH regulator, 1.0-7.0% of formaldehyde-removing single-atom catalyst, 20-45% of filler powder and 15-30% of deionized water.

By adopting the technical scheme, the formaldehyde-removing monatomic catalyst which is independently researched and developed is adopted, other auxiliary conditions are not needed, formaldehyde can be efficiently absorbed under the indoor conditions of normal temperature and normal pressure and no light, the formaldehyde is catalytically oxidized and decomposed into harmless carbon dioxide and water, secondary pollution is avoided, the lasting action time is long, the consumption of the formaldehyde is avoided, and the paint has the advantages of efficiently absorbing the formaldehyde, removing the formaldehyde for a long time, being tasteless, nontoxic, green and environment-friendly; and the independently developed formaldehyde-removing monatomic catalyst can be fused with a coating system, has the coating performance and also has the function of catalyzing, oxidizing and decomposing formaldehyde.

Preferably, the product is prepared from the following raw materials in parts by weight: 18-22% of acrylic emulsion, 1-2% of defoaming agent, 2-5% of dispersing agent and 5-10% of propylene glycol. 1-2% of film-forming additive, 4-8% of thickening agent, 0.2% of pH regulator, 2-5% of formaldehyde-removing monatomic catalyst, 30-40% of filler powder and 17-28% of deionized water.

By adopting the technical scheme, the coating is modified by adopting the independently researched and developed formaldehyde-removing monatomic catalyst, and when the mass percent of the formaldehyde-removing monatomic catalyst is more than 5%, the formaldehyde-removing effect is not obviously increased along with the improvement of the mass percent of the formaldehyde-removing monatomic catalyst, so that when the addition amount of the formaldehyde-removing monatomic catalyst is 2-5%, the antibacterial and disinfection performance can be ensured, and the production cost is reduced.

Preferably, the formaldehyde-removing monatomic catalyst consists of a carrier and a transition metal; the carrier is porous nano zirconium phosphate, and the transition metal is selected from one or more of Fe, Mn and Ag.

By adopting the technical scheme, the porous nano zirconium phosphate can adsorb more transition metals as a carrier so as to obtain the formaldehyde-removing monatomic catalyst capable of efficiently removing formaldehyde, the structure is stable, the porous structure is never unsaturated under the action of efficiently decomposing formaldehyde by using the active metal monatomic, the monatomic formaldehyde-removing coating has the advantages of efficiently absorbing formaldehyde, persistently decomposing formaldehyde, being tasteless, nontoxic and environment-friendly, and the porous nano zirconium phosphate is applied to the coating to improve the toughness, acid and alkali resistance, high temperature resistance, corrosion resistance and stability of a paint film.

Preferably, the transition metal of the formaldehyde-removing monatomic catalyst is fixed on the carrier in a monatomic form, and the mass ratio of the transition metal to the carrier in the formaldehyde-removing monatomic catalyst is 1 (20-200).

By adopting the technical scheme, the transition metal component with the formaldehyde removing effect is quantitatively controlled, when the mass ratio of the transition metal to the carrier is 1 (20-200), the prepared formaldehyde removing monatomic catalyst has the best catalytic efficiency on formaldehyde, and when the formaldehyde removing monatomic catalyst is applied to the coating, the formaldehyde removing monatomic catalyst can be uniformly mixed with the filler, so that the formaldehyde removing effect can be exerted for a long time, and the industrial production cost can be reduced.

Preferably, the synthesis steps of the formaldehyde-removing monatomic catalyst are as follows:

step 1: preparing a porous nano zirconium phosphate precursor: stirring 1- (2-aminoethyl) -3- (2-diethoxyphosphate) ethylimidazole bromine, zirconium nitrate and water in a molar ratio of 2:3:2 for 20-60min, and uniformly mixing to obtain a mixed solution A;

step 2, preparing a transition metal monoatomic precursor: dripping 40ml of 5% ammonia water solution into 200g/L nitrate solution at the speed of 80-120 mu L/s, stirring for 2-5h, then heating to 60 ℃ within 20-40min, continuing stirring for 2-4h, and then cooling to room temperature to obtain mixed solution B;

step 3, synthesizing a formaldehyde-removing monatomic catalyst precursor by in-situ coprecipitation: the mass ratio of the transition metal to the carrier is 1 (20-200), the mixed solution A is added into the mixed solution B according to the proportion, the mixture is stirred and mixed for 10-16h at room temperature, the reaction is carried out for 18-30h at 150 ℃, after the reaction is finished, the mixture is cooled to the room temperature, the mixture is centrifuged for 3-6 min at 10000 + 12500r/min, the obtained solid product is respectively washed by ethanol and water for 3-6 times, the vacuum drying is carried out for 3-6h at 100 ℃, and the powder is prepared by grinding;

step 4, generating the formaldehyde-removing monatomic catalyst in situ by a one-step method: and placing the obtained powder in an atmosphere of 5% hydrogen-argon mixed gas, heating for 2-4h at the temperature of 400 ℃, cooling to room temperature, and grinding to obtain the required catalyst, wherein transition metals contained in the prepared catalyst are fixed on a carrier in a monatomic mode.

By adopting the technical scheme, the prepared porous nano zirconium phosphate can be perfectly fused with a coating system to prepare the formaldehyde-decomposable monoatomic catalyst which can remove formaldehyde and is free of damage, and the prepared monoatomic coating which can decompose formaldehyde and is relatively low in production cost and easy to produce in batches for market promotion; the hydrogen-argon mixed gas is subjected to high-temperature activation, hydrogen is used for reduction, and the oxidation influence of high temperature on the formaldehyde-removing monatomic catalyst is reduced, so that the monatomic catalyst which can efficiently absorb formaldehyde and catalyze, oxidize and decompose the formaldehyde into harmless carbon dioxide and water under indoor normal-temperature normal-pressure and no light conditions is obtained.

step 1, preparing a porous nano zirconium phosphate precursor:

step 1.1, the preparation method of 1, 1- (2-aminoethyl) -3- (2-diethoxyphosphate) ethylimidazole bromine liquid comprises the following steps: the molar ratio is 1: 3, refluxing and stirring 1- (2-aminoethyl) imidazole hydrobromide and bromoethyl diethyl phosphate at 90 ℃ for 36 hours by taking methanol as a solvent; after the reaction is finished, cooling to room temperature, removing the solvent by rotary evaporation to obtain viscous liquid, dissolving the liquid in water, adding equimolar sodium hydroxide, stirring for 1h at the room temperature, removing the water by rotary evaporation, filtering out solid sodium bromide, and drying in vacuum to obtain the ionic liquid 1- (2-aminoethyl) -3- (2-diethoxyphosphate) ethylimidazole bromine;

step 1.2, stirring 1- (2-aminoethyl) -3- (2-diethoxyphosphate) ethylimidazole bromine, zirconium nitrate and water in a molar ratio of 2:3:2 for 30min, and uniformly mixing to obtain a mixed solution A;

step 2, preparing a transition metal monoatomic precursor: dripping 40ml of 5% ammonia water solution into 200g/L ferric nitrate solution at the speed of 100 mu L/s, stirring for 3h, then heating to 60 ℃ within 30min, continuing stirring for 3h, and then cooling to room temperature to obtain mixed solution B;

step 3, synthesizing a formaldehyde-removing monatomic catalyst precursor by in-situ coprecipitation: the mass ratio of the transition metal to the carrier is 1:50, the mixed solution A is added into the mixed solution B according to the proportion, the mixture is stirred and mixed for 12 hours at room temperature, the mixture is placed in a stainless steel reaction kettle with a polytetrafluoroethylene inner container and reacts for 24 hours at 150 ℃, after the reaction is finished, the mixture is cooled to the room temperature, the mixture is centrifuged for 4 minutes at 11000r/min, the obtained solid product is respectively washed by ethanol and water for at least 3 times, and the mixture is dried for 4 hours in vacuum at 100 ℃ and ground to obtain powder;

step 4, generating the formaldehyde-removing monatomic catalyst in situ by a one-step method: and placing the obtained powder in an atmosphere of 5% hydrogen-argon mixed gas, heating for 2h at the temperature of 400 ℃, cooling to room temperature, and grinding to obtain the required catalyst, wherein transition metals contained in the prepared catalyst are fixed on a carrier in a monatomic form.

By adopting the technical scheme, the formaldehyde-removing monatomic catalyst which can decompose formaldehyde, has high decomposition efficiency and can not damage the catalyst can be prepared.

Preferably, the filler powder comprises titanium dioxide accounting for 7-10% of the total mass of the product, kaolin accounting for 7-10% of the total mass of the product, talcum powder accounting for 6-8% of the total mass of the product and heavy calcium carbonate accounting for 8-14% of the total mass of the product; the granularity of the titanium dioxide, the kaolin and the talcum powder is 1000 meshes, and the granularity of the heavy calcium carbonate is 1500 meshes.

By adopting the technical scheme, the use of the titanium dioxide can ensure that the interior wall coating is resistant to sunlight, does not crack or change color, has high elongation and is acid and alkali resistant under the irradiation of sunlight; the kaolin has good associativity, so that titanium dioxide, talcum powder and heavy calcium carbonate can be better mixed together, and the mixing uniformity of the filler is ensured; the talcum powder has good covering power and lubricating effect; the heavy calcium carbonate can prevent the paint from settling, so that the system is easy to disperse, and the prepared paint layer has good gloss, cold resistance and heat resistance.

Preferably, the defoamer is a non-silicone mineral oil system; the dispersant is 20% of polycarboxylic acid ammonium salt; the film-forming additive is alcohol ester twelve; the thickening agent is a cellulose thickening agent; the pH regulator is dimethylethanolamine.

By adopting the technical scheme, the good dispersion effect on the filler powder is obtained due to the adoption of the polycarboxylic acid ammonium salt; due to the adoption of cellulose, the effect of adjusting the viscosity and assisting in improving the antibacterial capacity of the coating is obtained; dimethyl ethanolamine is adopted to adjust the pH value and simultaneously used as a water-soluble paint cosolvent; the alcohol ester twelve can effectively reduce the lowest film forming temperature, and is convenient for coating use.

In a second aspect, the present application provides a method for preparing a monoatomic coating having a formaldehyde removal function.

A preparation method of a monoatomic coating with a formaldehyde removal function comprises the following steps:

s1, putting 16-27% of deionized water into a container, then putting accurately weighed dispersing agent, 0.5-1.5% of defoaming agent and propylene glycol into the container in sequence, and stirring for 5-10 minutes;

s2, sequentially adding titanium dioxide, kaolin, talcum powder, heavy calcium and formaldehyde-removing single-atom catalyst which are accurately weighed into a container, and stirring for 15-30 minutes;

s3, adding a thickening agent, continuously stirring for 30-40 minutes, and adding dimethylethanolamine to adjust the pH value to 7-8;

and S4, sequentially adding accurately weighed acrylic emulsion, film-forming aid, 0.25% defoamer and 1% water into a container, stirring for 10-20 minutes, adding 0.25% defoamer, and continuously stirring for 30-50 minutes to obtain a coating finished product.

The preparation method is simple, the adopted equipment is less, the equipment cost is lower, large-scale batch production is facilitated, and the market popularization and the popularization of the monoatomic coating with the formaldehyde removing function are facilitated.

Preferably, the method comprises the following steps:

s1, putting 16-27% of deionized water into a container, then putting accurately weighed dispersing agent, 0.5-1.5% of defoaming agent and propylene glycol into the container in sequence, and stirring for 5 minutes;

s2, adjusting the rotating speed to 500 revolutions per minute, and sequentially adding accurately weighed titanium dioxide, kaolin, talcum powder, heavy calcium and formaldehyde-removing monatomic catalyst into a container at the speed of 500g/min and stirring for 15 minutes;

s3, adding a thickening agent into a container at the speed of 500g/min, adjusting the rotating speed to 1000 revolutions per minute, continuously stirring for 30 minutes, and adding dimethylethanolamine to adjust the pH value to 7-8;

and S4, sequentially adding weighed acrylic emulsion, film-forming assistant, 0.25% of defoaming agent and 1% of water into a container under the condition of keeping 1000 revolutions per minute, continuously stirring at high speed for 10 minutes, adding 0.25% of defoaming agent, linearly reducing the stirring speed at 100 revolutions per minute, adjusting the stirring speed to 300 revolutions per minute, and continuously stirring for 30 minutes to obtain a coating finished product.

By adopting the technical scheme, the monatomic coating which can efficiently absorb formaldehyde, remove formaldehyde for a long time, is tasteless, nontoxic, green and environment-friendly and has the formaldehyde removing function can be prepared.

In summary, the present application has the following beneficial effects:

1. the monatomic coating with the formaldehyde removing function uses the independently researched and developed formaldehyde removing monatomic catalyst, adopts a completely new monatomic formaldehyde decomposing technology, does not need other auxiliary conditions, can carry out efficient absorption and catalytic oxidative decomposition on formaldehyde under indoor conditions of normal temperature and pressure and no light, degrades the formaldehyde into harmless carbon dioxide and water, and avoids secondary pollution.

2. The monatomic coating with the formaldehyde removing function has the advantages of high-efficiency formaldehyde absorption, lasting formaldehyde decomposition, no consumption, lasting formaldehyde removing action time of more than 10 years, stable structure, and no saturation of a porous structure under the action of the active metal monatomic high-efficiency formaldehyde decomposition, and has the advantages of no odor, no toxicity, environmental protection and the like.

3. The preparation method is simple, the adopted equipment is less, the equipment cost is lower, large-scale batch production is facilitated, and the market popularization and the popularization of the monoatomic coating with the formaldehyde removing function are facilitated.

4. In a xenon arc radiation aging test of the coating, the coating prepared by the method has 720-hour lamplight radiation, the damage change degree grade of the coating surface is 0, the formaldehyde removal test is continuously carried out, and the formaldehyde concentration can still be reduced to a safe value range under indoor conditions of normal temperature and normal pressure and no light, so that the coating has good aging resistance and can last for more than 10 years.

Drawings

FIG. 1 is a transmission electron microscope photograph for correcting spherical aberration of the monoatomic catalyst used in preparation example 11 of the present application.

Detailed Description

The present application will be described in further detail with reference to examples.

Raw materials

Preparation example

Preparation example 1

The mass ratio of transition metal to carrier in the formaldehyde-removing monatomic catalyst is 1:20, and the synthesis steps are as follows:

1) preparing a porous nano zirconium phosphate precursor: the preparation of 1- (2-aminoethyl) -3- (2-diethoxyphosphate) ethylimidazole bromide liquid is carried out: the molar ratio is 1: 3, refluxing and stirring 1- (2-aminoethyl) imidazole hydrobromide and bromoethyl diethyl phosphate at 90 ℃ for 36 hours by taking methanol as a solvent; after the reaction is finished, cooling to room temperature, removing the solvent by rotary evaporation to obtain viscous liquid, dissolving the liquid in water, adding equimolar sodium hydroxide, stirring for 1h at the normal temperature, removing the water by rotary evaporation, filtering out solid sodium bromide, drying in vacuum to obtain ionic liquid 1- (2-aminoethyl) -3- (2-diethoxyphosphoryl) ethylimidazole bromide, stirring 1- (2-aminoethyl) -3- (2-diethoxyphosphoryl) ethylimidazole bromide, zirconium nitrate and water in a molar ratio of 2:3:2 for 30min, and uniformly mixing to obtain a mixed solution A;

2) preparation of a transition metal monoatomic precursor: dripping 40ml of 5% ammonia water solution into 200ml of 200g/L ferric nitrate solution at the speed of 100 mu L/s, stirring for 3h, then heating to 60 ℃ within 30min, continuing stirring for 3h, and then cooling to room temperature to obtain a mixed solution B;

3) in-situ coprecipitation synthesis of a formaldehyde-removing monatomic catalyst precursor: the mass ratio of the transition metal to the carrier is 1:20, the mixed solution A is added into the mixed solution B according to the proportion, the mixed solution B is stirred and mixed at the room temperature for 12 hours at 500rpm, the mixture is placed in a stainless steel reaction kettle with a polytetrafluoroethylene inner container for reaction for 24 hours at 150 ℃, after the reaction is finished, the mixture is cooled to the room temperature, the mixture is centrifuged at 11000r/min for 4 minutes, solid products are obtained and are respectively washed with ethanol and water for 3 times, the mixture is dried in vacuum for 4 hours at 100 ℃, a planetary ball mill is used, the tank body of the planetary ball mill is a zirconia ball milling tank, the polytetrafluoroethylene material is the inner container, the grinding balls are zirconia, the ball milling speed is 500r/min, and the particle size of the;

4) one-step method in-situ generation of formaldehyde-removing monatomic catalyst: heating the obtained powder for 2h under the temperature condition of 400 ℃ in a 5% hydrogen-argon mixed gas atmosphere, cooling to room temperature, using a planetary ball mill, wherein the tank body of the planetary ball mill is a zirconia ball milling tank, a polytetrafluoroethylene material is an inner container, a grinding ball is zirconia, the ball milling speed is 100r/min, the particle size of the catalyst obtained by grinding is less than or equal to 1.6 mu m, and transition metal contained in the prepared catalyst is fixed on a carrier in a monatomic mode.

Preparation example 2

The mass ratio of transition metal to carrier in the formaldehyde-removing monatomic catalyst is 1:50, and the synthesis steps are as follows:

3) in-situ coprecipitation synthesis of a formaldehyde-removing monatomic catalyst precursor: the mass ratio of the transition metal to the carrier is 1:50, the mixed solution A is added into the mixed solution B according to the proportion, the mixture is stirred and mixed for 12 hours at room temperature, the mixture is placed in a stainless steel reaction kettle with a polytetrafluoroethylene inner container to react for 24 hours at 150 ℃, after the reaction is finished, the mixture is cooled to room temperature, the mixture is centrifuged for 4 minutes at 11000r/min, solid products are obtained and are respectively washed for 3 times by ethanol and water, the solid products are dried for 4 hours in vacuum at 100 ℃, a planetary ball mill is used, the tank body of the planetary ball mill is a zirconia ball milling tank, the inner container is made of polytetrafluoroethylene, grinding balls are zirconia, the ball milling speed is 500r/min, and powder with the particle size being;

4) one-step method in-situ generation of formaldehyde-removing monatomic catalyst: heating the obtained powder for 2h at the temperature of 400 ℃ in a 5% hydrogen-argon mixed gas atmosphere, cooling to room temperature, using a planetary ball mill, wherein the tank body of the planetary ball mill is a zirconia ball milling tank, the inner container is made of polytetrafluoroethylene, the grinding ball is zirconia, the ball milling speed is 100r/min, grinding is carried out, the particle size of the obtained catalyst is less than or equal to 1.6 mu m, and transition metal contained in the prepared catalyst is fixed on a carrier in a monatomic mode.

Preparation example 3

The mass ratio of transition metal to carrier in the formaldehyde-removing monatomic catalyst is 1:100, and the synthesis steps are as follows:

3) in-situ coprecipitation synthesis of a formaldehyde-removing monatomic catalyst precursor: the mass ratio of the transition metal to the carrier is 1:100, the mixed solution A is added into the mixed solution B according to the proportion, the mixture is stirred and mixed for 12 hours at room temperature, the mixture is placed in a stainless steel reaction kettle with a polytetrafluoroethylene inner container to react for 24 hours at 150 ℃, after the reaction is finished, the mixture is cooled to room temperature, the mixture is centrifuged for 4 minutes at 11000r/min, solid products are obtained and are respectively washed for 3 times by ethanol and water, the solid products are dried for 4 hours in vacuum at 100 ℃, a planetary ball mill is used, the tank body of the planetary ball mill is a zirconia ball milling tank, the inner container is made of polytetrafluoroethylene, grinding balls are zirconia, the ball milling speed is 500r/min, and powder with the particle size;

Preparation example 4

The mass ratio of transition metal to carrier in the formaldehyde-removing monatomic catalyst is 1:200, and the synthesis steps are as follows:

2) preparation of a transition metal monoatomic precursor: slowly dripping 40ml of 5% ammonia water solution into 200ml of 200g/L ferric nitrate solution, stirring for 3h, then heating to 60 ℃ within 30min, continuing stirring for 3h, and then cooling to room temperature to obtain a mixed solution B;

3) in-situ coprecipitation synthesis of a formaldehyde-removing monatomic catalyst precursor: the mass ratio of the transition metal to the carrier is 1:200, the mixed solution A is added into the mixed solution B according to the proportion, the mixture is stirred and mixed for 12 hours at room temperature, the mixture is placed in a stainless steel reaction kettle with a polytetrafluoroethylene inner container to react for 24 hours at 150 ℃, after the reaction is finished, the mixture is cooled to the room temperature, the mixture is centrifuged for 4 minutes at 11000r/min, solid products are obtained and are respectively washed for 3 times by ethanol and water, the solid products are dried for 4 hours in vacuum at 100 ℃, a planetary ball mill is used, the tank body of the planetary ball mill is a zirconia ball milling tank, the inner container is made of polytetrafluoroethylene, grinding balls are zirconia, the ball milling speed is 500r/min, and powder with the particle;

Preparation example 5

Preparing a filler: weighing 10.0kg of 1000-mesh titanium dioxide, 10kg of 1000-mesh kaolin, 6.0kg of 1000-mesh talcum powder and 14kg of 1500-mesh heavy calcium carbonate, and stirring and uniformly mixing for 10 minutes at the stirring speed of 500 revolutions per minute to obtain the filler A.

Preparation example 6

Preparing a filler: weighing 10.0kg of 1000-mesh titanium dioxide, 9kg of 1000-mesh kaolin, 7.0kg of 1000-mesh talcum powder and 14kg of 1500-mesh heavy calcium carbonate, and stirring and uniformly mixing for 10 minutes at the stirring speed of 500 revolutions per minute to obtain the filler B.

Preparation example 7

Preparing a filler: weighing 8.0kg of 1000-mesh titanium dioxide, 8kg of 1000-mesh kaolin, 7.0kg of 1000-mesh talcum powder and 10kg of 1500-mesh heavy calcium carbonate, and stirring and uniformly mixing for 10 minutes at the stirring speed of 500 revolutions per minute to obtain the filler C.

Preparation example 8

Preparing a filler: weighing 7.0kg of 1000-mesh titanium dioxide, 7kg of 1000-mesh kaolin, 8.0kg of 1000-mesh talcum powder and 8kg of 1500-mesh heavy calcium carbonate, and stirring and uniformly mixing for 10 minutes at the stirring speed of 500 revolutions per minute to obtain the filler D.

Preparation example 9

A preparation method for preparing a porous zirconium phosphate-based monatomic catalyst by an in-situ encapsulation method comprises the following steps:

step 1, preparing a porous nano zirconium phosphate precursor: stirring 1- (2-aminoethyl) -3- (2-diethoxyphosphate) ethylimidazole bromine, zirconium nitrate and water in a molar ratio of 2:3:2 for 30min, and uniformly mixing to obtain a mixed solution A;

step 2, preparing a transition metal monoatomic precursor: dropwise adding 20ml of 5% ammonia water solution into 200ml of 100g/L manganese nitrate solution at the speed of 100 mu L/s, stirring for 3h, then heating to 60 ℃ within 30min, continuing stirring for 3h, and then cooling to room temperature to obtain a mixed solution B;

step 3, in-situ coprecipitation synthesis of a monatomic catalyst precursor: adding the mixed solution A into the mixed solution B according to a proportion, stirring and mixing at room temperature for 12 hours, placing the mixture into a stainless steel reaction kettle with a polytetrafluoroethylene inner container, reacting at 150 ℃ for 24 hours, cooling to room temperature after the reaction is finished, centrifuging at 11000r/min for 4 minutes to obtain a solid product, washing the solid product with ethanol and water for 3 times respectively, drying at 100 ℃ for 4 hours in vacuum, using a planetary ball mill, wherein the tank body of the planetary ball mill is a zirconia ball milling tank, the milling balls are zirconia, and the ball milling speed is 100r/min to prepare powder with the particle size of less than or equal to 1.6 mu m;

step 4, generating the monatomic catalyst in situ by a one-step method: heating the obtained powder for 2h at the temperature of 500 ℃ in a 5% hydrogen-argon mixed gas atmosphere, cooling to room temperature, grinding by using a planetary ball mill, wherein the tank body of the planetary ball mill is a zirconia ball milling tank, grinding balls are zirconia, the ball milling speed is 100r/min, the obtained catalyst has the particle size of less than or equal to 1.6 mu m, and transition metals contained in the prepared catalyst are fixed on a carrier in a single atom form.

Preparation example 10

step 2, preparing a transition metal monoatomic precursor: dripping 10ml of 5% ammonia water solution into 100ml of 5g/L silver nitrate solution at the speed of 100 mu L/s, stirring for 3h, then heating to 60 ℃ within 30min, continuing stirring for 3h, and then cooling to room temperature to obtain a mixed solution B;

step 3, in-situ coprecipitation synthesis of a monatomic catalyst precursor: adding the mixed solution A into the mixed solution B according to a proportion, stirring and mixing at room temperature for 12 hours, placing the mixture into a stainless steel reaction kettle with a polytetrafluoroethylene inner container, reacting at 150 ℃ for 24 hours, cooling to room temperature after the reaction is finished, centrifuging at 11000r/min for 4 minutes to obtain a solid product, washing the solid product with ethanol and water for 3 times respectively, drying in vacuum at 100 ℃ for 4 hours, using a planetary ball mill, wherein the tank body of the planetary ball mill is a zirconia ball milling tank, the milling balls are zirconia, and the ball milling speed is 500r/min to prepare powder with the particle size of less than or equal to 1.6 mu m;

step 4, generating the monatomic catalyst in situ by a one-step method: heating the obtained powder for 2h at the temperature of 400 ℃ in a 5% hydrogen-argon mixed gas atmosphere, cooling to room temperature, grinding by using a planetary ball mill, wherein the tank body of the planetary ball mill is a zirconia ball milling tank, grinding balls are zirconia, the ball milling speed is 100r/min, the obtained catalyst has the particle size of less than or equal to 1.6 mu m, and transition metals contained in the prepared catalyst are fixed on a carrier in a single atom form.

Preparation example 11

step 2, preparing a transition metal monoatomic precursor: 30ml of a 5% aqueous ammonia solution was added dropwise at a rate of 100. mu.L/sec to 150ml of a 5g/L silver nitrate solution, 100g/L manganese nitrate solution and 100g/L ferric nitrate solution, and stirred for 3 hours, wherein the ratio of Ag: mn: the mass ratio of Fe is 0.5:50:80, then the temperature is raised to 60 ℃ within 30min, the stirring is continued for 3h, and then the temperature is cooled to room temperature, thus obtaining a mixed solution B.

Step 3, in-situ coprecipitation synthesis of a monatomic catalyst precursor: the mass ratio of the transition metal to the carrier is 1:100, the mixed solution A is added into the mixed solution B according to the proportion, the mixture is stirred and mixed for 12 hours at room temperature, the mixture is placed in a polytetrafluoroethylene reaction kettle for reaction for 24 hours at 150 ℃, after the reaction is finished, the mixture is cooled to the room temperature, the mixture is centrifuged for 4 minutes at 11000r/min, solid products are obtained and are respectively washed for 3 times by ethanol and water, the mixture is dried for 4 hours under vacuum at 100 ℃, a planetary ball mill is used, the tank body of the planetary ball mill is a zirconia ball milling tank, the grinding ball is zirconia, the ball milling speed is 500r/min, and powder with the particle size of less than;

step 4, generating the monatomic catalyst in situ by a one-step method: heating the obtained powder for 2h at 400 ℃ in a 5% hydrogen-argon mixed gas atmosphere, cooling to room temperature, grinding with a planetary ball mill, wherein the pot body of the planetary ball mill is a zirconia ball milling pot, the grinding balls are zirconia, the ball milling speed is 100r/min, and the particle size of the obtained catalyst is less than or equal to 1.6 mu m, and referring to fig. 1, the transition metal contained in the prepared catalyst is fixed on a carrier in a monoatomic form.

Examples

Example 1

The invention discloses a monoatomic coating with a formaldehyde removing function, which adopts the technical scheme that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 18% of acrylic emulsion, 1% of defoaming agent, 2% of dispersing agent, 5% of propylene glycol, 1% of film-forming assistant, 4% of thickening agent, 0.2% of pH regulator, 2% of formaldehyde-removing single-atom catalyst in preparation example 2, 40% of filler powder in preparation example 5 and 26.8% of deionized water.

The preparation method of the monoatomic coating with the formaldehyde removing function comprises the following steps:

s1, putting 25.8kg of deionized water into a reaction kettle, setting the stirring speed to 300 r/min, sequentially putting 2kg of accurately weighed dispersing agent, 0.5kg of defoaming agent and 5kg of propylene glycol into the reaction kettle in a stirring state, and stirring for 5 min for later use;

s2, adjusting the stirring speed to 500 revolutions per minute, sequentially adding 40kg of the filler powder in the preparation example 5 and 2.0kg of the formaldehyde-removing monatomic catalyst in the preparation example 2 into the reaction kettle at the speed of 500g/min, and continuously stirring for 15 minutes for later use;

s3, adding 4kg of thickening agent into the reaction kettle at the speed of 500g/min, adjusting the rotating speed to 1000 rpm in the thickening agent adding process, continuously stirring for 30 minutes, and adding 200g of dimethylethanolamine to adjust the pH value;

and S4, sequentially adding 18kg of acrylic emulsion, 1.0kg of film-forming assistant, 0.25kg of defoaming agent and 1kg of water which are accurately weighed into a reaction kettle under the condition of keeping 1000 revolutions per minute, continuously stirring for 10 minutes at the rotating speed of 1000 revolutions per minute, adding 0.25kg of defoaming agent, adjusting the rotating speed to 300 revolutions per minute, and continuously stirring for 30 minutes to obtain a coating finished product.

Example 2

Example 2 differs from example 1 in that: the formaldehyde-removing monatomic catalyst was replaced with the formaldehyde-removing monatomic catalyst in preparation example 1.

Example 3

Example 3 differs from example 1 in that: the formaldehyde-removing monatomic catalyst was replaced with the formaldehyde-removing monatomic catalyst in preparation example 3.

Example 4

Example 4 differs from example 1 in that: the formaldehyde-removing monatomic catalyst was replaced with the formaldehyde-removing monatomic catalyst in preparation example 4.

Example 5

The invention discloses a monoatomic coating with a formaldehyde removing function, which adopts the technical scheme that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 20% of acrylic emulsion, 1.3% of defoaming agent, 3% of dispersing agent, 6.5% of propylene glycol, 1.3% of film-forming aid, 5.5% of thickening agent, 0.2% of pH regulator, 3% of formaldehyde-removing single-atom catalyst in preparation example 2, 36% of filler powder in preparation example 6 and 23.2% of deionized water.

s1, putting 22.2kg of deionized water into a reaction kettle, setting the stirring speed to 300 r/min, sequentially putting 3.0kg of accurately weighed dispersing agent, 0.8kg of defoaming agent and 6.5kg of propylene glycol into the reaction kettle in a stirring state, and stirring for 5 min for later use;

s2, adjusting the stirring speed to 500 revolutions per minute, sequentially adding 36kg of the filler powder in the preparation example 6 and 3.0kg of the formaldehyde-removing monatomic catalyst in the preparation example 2 into the reaction kettle at the speed of 500g/min, and continuously stirring for 15 minutes for later use; s3, adding 5.5kg of thickening agent into the reaction kettle at the speed of 500g/min, adjusting the rotating speed to 1000 revolutions per minute in the thickening agent adding process, continuously stirring for 30 minutes, and then adding 200g of dimethylethanolamine to adjust the pH value;

and S4, sequentially adding 20kg of accurately weighed acrylic emulsion, 1.3kg of film-forming assistant, 0.25kg of defoaming agent and 1.0kg of water into a reaction kettle under the condition of keeping 1000 revolutions per minute, continuously stirring for 10 minutes at the rotating speed of 1000 revolutions per minute, adding 0.25kg of defoaming agent, adjusting the rotating speed to 300 revolutions per minute, and continuously stirring for 30 minutes to obtain the finished coating.

Example 6

The invention discloses a monoatomic coating with a formaldehyde removing function, which adopts the technical scheme that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 22% of acrylic emulsion, 1.6% of defoaming agent, 4% of dispersing agent, 8% of propylene glycol, 1.6% of film-forming assistant, 7% of thickening agent, 0.2% of pH regulator, 4% of formaldehyde-removing single-atom catalyst in preparation example 3, 33% of filler powder in preparation example 7 and 18.6% of deionized water.

s1, putting 17.6kg of deionized water into a reaction kettle, setting the stirring speed to 300 r/min, sequentially putting 4.0kg of accurately weighed dispersing agent, 1.1kg of defoaming agent and 8kg of propylene glycol into the reaction kettle in a stirring state, and stirring for 5 min for later use;

s2, adjusting the stirring speed to 500 revolutions per minute, sequentially adding 33kg of the filler powder in the preparation example 7 and 4.0kg of the formaldehyde-removing monatomic catalyst in the preparation example 2 into the reaction kettle at the speed of 500g/min, and continuously stirring for 15 minutes for later use;

s3, adding 7kg of thickening agent into the reaction kettle at a speed of 500g/min, wherein the adding speed is 320g/min, adjusting the rotating speed to 1000 rpm in the thickening agent adding process, continuously stirring for 30 minutes, and then adding 200g of dimethylethanolamine to adjust the pH value;

and S4, sequentially adding 22kg of acrylic emulsion, 1.6kg of film-forming additive, 0.25kg of defoaming agent and 1.0kg of water which are accurately weighed into a reaction kettle under the condition of keeping 1000 revolutions per minute, continuously stirring for 10 minutes at the rotating speed of 1000 revolutions per minute, adding 0.25kg of defoaming agent, adjusting the rotating speed to 300 revolutions per minute, and continuously stirring for 30 minutes to obtain the finished coating.

Example 7

The invention discloses a monoatomic coating with a formaldehyde removing function, which adopts the technical scheme that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 20% of acrylic emulsion, 2% of defoaming agent, 5% of dispersing agent, 10% of propylene glycol, 2% of film-forming assistant, 8% of thickening agent, 0.2% of pH regulator, 5% of formaldehyde-removing single-atom catalyst in preparation example 4, 30% of filler powder in preparation example 8 and 17.8% of deionized water.

s1, putting 16.8kg of deionized water into a reaction kettle, setting the stirring speed to 300 r/min, sequentially putting 4.0kg of accurately weighed dispersing agent, 1.5kg of defoaming agent and 10kg of propylene glycol into the reaction kettle in a stirring state, and stirring for 5 min for later use;

s2, adjusting the stirring speed to 500 revolutions per minute, sequentially adding 30kg of the filler powder in the preparation example 7 and 5.0kg of the formaldehyde-removing monatomic catalyst in the preparation example 2 into the reaction kettle at the speed of 500g/min, and continuously stirring for 15 minutes for later use;

s3, adding 8kg of thickening agent into the reaction kettle at a speed of 500g/min, wherein the adding speed is 320g/min, adjusting the rotating speed to 1000 rpm in the thickening agent adding process, continuously stirring for 30 minutes, and then adding 200g of dimethylethanolamine to adjust the pH value;

and S4, sequentially adding 20kg of accurately weighed acrylic emulsion, 2.0kg of film-forming assistant, 0.25kg of defoaming agent and 1.0kg of water into the reaction kettle under the condition of keeping 1000 revolutions per minute, continuously stirring for 10 minutes at the rotating speed of 1000 revolutions per minute, adding 0.25kg of defoaming agent, adjusting the rotating speed to 300 revolutions per minute, and continuously stirring for 30 minutes to obtain the finished coating.

Example 8

Example 8 differs from example 1 in that: the formaldehyde-removing monatomic catalyst was replaced with the formaldehyde-removing monatomic catalyst in preparation example 9.

Example 9

Example 9 differs from example 1 in that: the formaldehyde-removing monatomic catalyst was replaced with the formaldehyde-removing monatomic catalyst in preparation example 10.

Example 10

Example 10 example 1 differs in that: the formaldehyde-removing monatomic catalyst was replaced with the formaldehyde-removing monatomic catalyst of preparation example 11.

Comparative example

Comparative example 1

Comparative example 1 differs from example 1 in that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 18% of acrylic emulsion, 1% of defoaming agent, 2% of dispersing agent, 5% of propylene glycol, 1% of film-forming aid, 4% of thickening agent, 0.2% of pH regulator, 42% of filler powder in preparation example 6 and 26.8% of deionized water.

Comparative example 2

Comparative example 2 differs from example 5 in that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 20% of acrylic emulsion, 1.3% of defoaming agent, 3% of dispersing agent, 6.5% of propylene glycol, 1.3% of film-forming additive, 5.5% of thickening agent, 0.2% of pH regulator, 39% of filler powder and 23.2% of deionized water.

Comparative example 3

Comparative example 3 differs from example 6 in that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 22% of acrylic emulsion, 1.6% of defoaming agent, 4% of dispersing agent, 8% of propylene glycol, 1.6% of film-forming aid, 7% of thickening agent, 0.2% of pH regulator, 37% of filler powder and 18.6% of deionized water.

Comparative example 4

Comparative example 4 differs from example 7 in that: the monoatomic coating is prepared from the following raw materials in percentage by mass: 20% of acrylic emulsion, 2% of defoaming agent, 5% of dispersing agent, 10% of propylene glycol, 2% of film-forming assistant, 8% of thickening agent, 0.2% of pH regulator, 35% of filler powder and 17.8% of deionized water.

Performance test

And (3) aldehyde removal performance test:

1. detection standard

QB/T2761-2006 indoor air purification product purification effect determination method.

2. Detection device

Test chamber (1.5 m)³) The air sampler (2020) and the ultraviolet-visible spectrophotometer (752N).

3. Test procedure

Step 1, uniformly stirring the product, coating one surface of four glass plates (the thickness is 4mm-6mm) with the thickness of 500mm multiplied by 500mm by a uniform spraying method according to the theoretical coating amount of the product, and drying for 24h in an experimental environment for testing.

Step 2, respectively vertically placing 2 glass rods wound with 5 layers of gauze into 2500 mL reagent bottles, respectively filling 200mL of pollutants (0.2% of formaldehyde) and attaching labels A1 and B1. And after the gauze is completely wetted, putting the gauze into use.

And 3, respectively placing the blank glass plate and the prepared test sample plate into a blank test chamber A and a sample test chamber B, placing four plates in each chamber on a sample frame, and placing one surface of the sample plate coated with the sample towards the center of the chamber.

And 4, respectively placing the release sources A1 and B1 into the blank test chamber A and the sample test chamber B, and immediately closing the chamber doors.

And 5, starting fans in the cabin A and the cabin B, turning off the fans after stirring for 1min, and sampling to determine the initial pollutant concentration of the blank cabin A.

And 5, without a light source, respectively carrying out sample collection test analysis on the cabin A and the cabin B after 24 hours at room temperature and normal pressure, and recording the concentrations as CA and CB.

And 6, repeating the operation after the step 4 after every 24 hours, and continuously testing for seven days.

The formaldehyde removal rate was calculated according to the following formula:

X＝(CA－CB)/CA×100％，

in the formula:

X-Formaldehyde removal rate,%;

CA-formaldehyde concentration after 24h of blank chamber.

CB-concentration of formaldehyde after 24h in the sample chamber.

2. And (3) anti-aging test: the coating is subjected to a xenon arc radiation aging test, the test is carried out according to GB/T1865-2009 color paint and varnish artificial weathering and artificial radiation, and the test equipment is a GB/T1865-2009 artificial weathering/xenon arc radiation test box. And detecting the damage change degree of the surface of the coating after the coating is radiated by lamplight for 720 hours.

Detection method/test method

Table 1 shows the formaldehyde removal performance of example 1 and comparative example 1

Table 2 shows the formaldehyde removal performance of example 5 and comparative example 2

Table 3 shows the formaldehyde removal performance of example 6 and comparative example 3

Table 4 shows the formaldehyde removal performance of example 7 and comparative example 4

Table 5 shows the formaldehyde removal performance of examples 1 to 4

Table 6 shows the formaldehyde removal performance of examples 1 and 8 to 10

TABLE 7 formaldehyde removal Performance after 720h aging of the coatings prepared in examples 1-6 and comparative examples 1-4 and the formaldehyde removal Performance after 720h aging of the coatings again after 24h

Note: a level 0 represents no change, i.e. no observable change.

When the example 1 and the comparative example 1 are combined and the table 1 is combined, the formaldehyde removing effect of the formaldehyde removing monatomic catalyst added in the example 1 is obviously larger than that of the comparative example.

Combining example 5 and comparative example 2 and combining table 2, it can be seen that the formaldehyde removing effect of the addition of the formaldehyde removing monatomic catalyst in example 5 is significantly greater than that of the comparative example.

By combining example 6 and comparative example 2 and table 3, it can be seen that the formaldehyde removing effect of the addition of the formaldehyde removing monatomic catalyst in example 6 is significantly greater than that of the comparative example.

Combining example 7 and comparative example 2 and combining table 4, it can be seen that the formaldehyde removing effect of the addition of the formaldehyde removing monatomic catalyst in example 7 is significantly greater than that of the comparative example.

It can be seen from the combination of examples 1-4 and Table 5 that the formaldehyde-removing monatomic catalyst prepared in preparation examples 1 and 2 has a good formaldehyde-removing effect when applied to a coating, and it is more cost-effective to select the formaldehyde-removing monatomic catalyst of preparation example 2 in order to reduce the production cost.

As can be seen by combining example 1 with examples 8 to 10 and Table 6, the monatomic catalysts prepared in preparation example 1 and preparation examples 9 to 11 had better formaldehyde removal effects.

By combining examples 1-10 and table 7, it can be seen that in the xenon arc radiation aging test of the coating, the degree of damage change of the coating surface is 0 for 720 hours of light radiation, and the formaldehyde concentration can still be reduced to the safe value range under the indoor conditions of normal temperature and pressure and no light after the formaldehyde removal test is continuously carried out, which indicates that the coating of the invention has good aging resistance and can last for more than 10 years.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The monoatomic coating with the formaldehyde removing function is characterized by being prepared from the following raw materials in parts by weight: 15.0-25.0% of acrylic emulsion, 1.0-2.0% of defoaming agent, 1.0-5.0% of dispersing agent, 3.0-15.0% of propylene glycol, 0.5-2.0% of film-forming additive, 2.0-8.0% of thickening agent, 0.1-0.5% of pH regulator, 1.0-7.0% of formaldehyde-removing single-atom catalyst, 20-45% of filler powder and 15-30% of deionized water.

2. The monatomic coating with a formaldehyde-removing function according to claim 1, wherein: the product is prepared from the following raw materials in parts by weight: 18-22% of acrylic emulsion, 1-2% of defoaming agent, 2-5% of dispersing agent, 5-10% of propylene glycol, 1-2% of film-forming assistant, 4-8% of thickening agent, 0.2% of pH regulator, 2-5% of formaldehyde-removing single-atom catalyst, 30-40% of filler powder and 17-28% of deionized water.

3. The monoatomic coating with a formaldehyde removal function according to claim 1, wherein the formaldehyde removal monoatomic catalyst is composed of a carrier and a transition metal; the carrier is porous nano zirconium phosphate, and the transition metal is selected from one or more of Fe, Mn and Ag.

4. The monoatomic coating with a formaldehyde removal function according to claim 3, wherein the transition metal of the formaldehyde removal monoatomic catalyst is encapsulated on a carrier in a monoatomic form in situ; the mass ratio of the transition metal to the carrier in the formaldehyde-removing monatomic catalyst is 1 (20-200).

5. The monatomic coating with the formaldehyde removal function according to claim 3 or 4, wherein the formaldehyde removal monatomic catalyst is synthesized by the following steps:

6. The monatomic coating with the formaldehyde removing function according to claim 5, wherein the formaldehyde removing monatomic catalyst is synthesized by the following steps:

step 1, preparing a porous nano zirconium phosphate precursor:

7. The monatomic coating with the formaldehyde removing function according to claim 1, wherein the filler powder comprises titanium dioxide accounting for 7-10% of the total mass of the product, kaolin accounting for 7-10% of the total mass of the product, talcum powder accounting for 6-8% of the total mass of the product, and ground calcium carbonate accounting for 8-14% of the total mass of the product; the granularity of the titanium dioxide, the kaolin and the talcum powder is 1000 meshes, and the granularity of the heavy calcium carbonate is 1500 meshes.

8. The monatomic coating with formaldehyde-removing function according to claim 1, wherein the defoaming agent is a non-silicone mineral oil system; the dispersant is 20% of polycarboxylic acid ammonium salt; the film-forming additive is alcohol ester twelve; the thickening agent is a cellulose thickening agent; the pH regulator is dimethylethanolamine.

9. The method for preparing the monoatomic coating with the formaldehyde removal function according to any one of claims 1 to 8, comprising the following steps:

10. The method for preparing the monatomic coating with the formaldehyde-removing function according to claim 9, which is characterized by comprising the following steps: