阅读说明：本技术 一种纳米光触媒除甲醛涂料及其制备方法 (Nano photocatalyst formaldehyde-removing paint and preparation method thereof ) 是由 王代萍 王传生 詹结发 程恒 于 2021-09-27 设计创作，主要内容包括：本发明适用涂料技术领域,提供了一种纳米光触媒除甲醛涂料及其制备方法,纳米光触媒除甲醛涂料,包括以下重量份原料：有机组分26-38份、改性纳米二氧化钛13-18份、改性硅灰石粉8-16份、氟碳乳液5-10份、微胶囊化红磷6-12份、成膜助剂1-2份、植物精油1-3份、流平剂0.1-0.6份、紫外线吸收剂0.1-0.5份、分散剂2-6份、消泡剂1-3份；本发明实施例提供的纳米光触媒除甲醛涂料,通过对纳米二氧化钛以及硅石灰粉进行改性处理,再与其他组分按照重量份比例进行混合,能有效地保证涂料的强度和性能,制得的涂料污染小,强度高,除甲醛能力优异,耐腐蚀、防水阻燃,耐高温。(The invention is applicable to the technical field of coatings, and provides a nano photocatalyst formaldehyde-removing coating and a preparation method thereof, wherein the nano photocatalyst formaldehyde-removing coating comprises the following raw materials in parts by weight: 26-38 parts of organic component, 13-18 parts of modified nano titanium dioxide, 8-16 parts of modified wollastonite powder, 5-10 parts of fluorocarbon emulsion, 6-12 parts of microencapsulated red phosphorus, 1-2 parts of film-forming assistant, 1-3 parts of vegetable essential oil, 0.1-0.6 part of flatting agent, 0.1-0.5 part of ultraviolet absorbent, 2-6 parts of dispersant and 1-3 parts of defoaming agent; according to the nano photocatalyst formaldehyde removal coating provided by the embodiment of the invention, the nano titanium dioxide and the silica fume are subjected to modification treatment and then are mixed with other components according to the weight part ratio, so that the strength and the performance of the coating can be effectively ensured, and the prepared coating has the advantages of small pollution, high strength, excellent formaldehyde removal capability, corrosion resistance, water resistance, flame retardance and high temperature resistance.)

1. The nano photocatalyst formaldehyde-removing paint is characterized by comprising the following raw materials in parts by weight: 26-38 parts of organic component, 13-18 parts of modified nano titanium dioxide, 8-16 parts of modified wollastonite powder, 5-10 parts of fluorocarbon emulsion, 6-12 parts of microencapsulated red phosphorus, 1-2 parts of film-forming assistant, 1-3 parts of vegetable essential oil, 0.1-0.6 part of flatting agent, 0.1-0.5 part of ultraviolet absorbent, 2-6 parts of dispersant and 1-3 parts of defoaming agent.

2. The nano-photocatalyst formaldehyde-removing coating as claimed in claim 1, wherein the organic component is selected from one or more of poly-3-hydroxycrotonic acid-2-ethylene methacrylate, aqueous polyurethane and aqueous polyacrylate.

3. The nano-photocatalyst formaldehyde-removing paint as claimed in claim 1, wherein the plant essential oil is selected from one or a mixture of more than two of lavender oil, clove oil, thyme oil, lemon oil, tea tree oil and evening primrose oil.

4. The nano-photocatalyst formaldehyde-removing coating as claimed in claim 1, wherein the dispersing agent is vinyl bis-stearamide; the ultraviolet absorbent is phenyl salicylate or ultraviolet absorbent UV-P; the film forming assistant is selected from propylene glycol, methyl ether, propylene glycol butyl ether and alcohol ester twelve; the defoaming agent is emulsified silicone oil, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, and the weight ratio of the defoaming agent to the silicone oil is 1: 1: 2, mixing; the leveling agent is one or a mixture of more than two of polyacrylic acid, carboxymethyl cellulose and polyether polyester modified organic siloxane.

5. The nano-photocatalyst formaldehyde-removing coating as claimed in claim 1, wherein the nano titanium dioxide is prepared by the following method: preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4-4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, adding a KH-570 silane coupling agent, placing into a constant-temperature water tank to maintain the reaction temperature at 90 ℃, and reacting for 3h under the stirring condition; filtering and washing, extracting the separated solid with 300ml of absolute ethyl alcohol for 6h, drying at 100-110 ℃ for 8h, and crushing to obtain the modified nano titanium dioxide after being treated with the KH-570 silane coupling agent.

6. The nano-photocatalyst formaldehyde-removing coating as claimed in claim 5, wherein the mass ratio of the KH-570 silane coupling agent to the nano titanium dioxide powder is 1: (3-5).

7. The nano photocatalyst formaldehyde-removing coating as claimed in claim 1, wherein the preparation method of the modified wollastonite powder comprises the following steps: dispersing wollastonite powder in ethanol, adding a silane coupling agent KH55, stirring at 40-60 ℃ for reaction for 3-5 hours, centrifuging, and drying in a vacuum drying oven at 70-80 ℃ for 15-18 hours to obtain the modified wollastonite powder.

8. The nano photocatalyst formaldehyde-removing coating as claimed in claim 7, wherein the mass ratio of the wollastonite powder, the ethanol and the silane coupling agent KH55 is 5 (8-10) to 0.01-0.03.

9. The nano photocatalyst formaldehyde-removing paint as claimed in claim 1, which comprises the following raw materials in parts by weight: 32 parts of organic component, 15 parts of modified nano titanium dioxide, 13 parts of modified wollastonite powder, 8 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of film-forming assistant, 2 parts of plant essential oil, 0.4 part of flatting agent, 0.3 part of ultraviolet absorbent, 4 parts of dispersing agent and 1 part of defoaming agent.

10. The method for preparing the nano-photocatalyst formaldehyde-removing paint as claimed in any one of claims 1 to 9, comprising the steps of:

1) weighing the following raw materials in parts by weight: 26-38 parts of organic component, 13-18 parts of modified nano titanium dioxide, 8-16 parts of modified wollastonite powder, 5-10 parts of fluorocarbon emulsion, 6-12 parts of microencapsulated red phosphorus, 1-2 parts of film-forming assistant, 1-3 parts of vegetable essential oil, 0.1-0.6 part of flatting agent, 0.1-0.5 part of ultraviolet absorbent, 2-6 parts of dispersant and 1-3 parts of defoaming agent;

2) adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder;

3) adding the organic components, the fluorocarbon emulsion and the microencapsulated red phosphorus into a stirrer, stirring for 15-20min, uniformly mixing, then adding into a container, catalyzing for 2-3h by using ultraviolet light with the wavelength range of 350-;

4) adding plant essential oil, film forming auxiliary agent, leveling agent, ultraviolet absorbent, dispersant and defoaming agent into another stirrer, and stirring for 20-30 min;

5) and (4) adding the mixed solution into the stirrer in the step (4), and stirring for 15-30 min.

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a nano photocatalyst formaldehyde-removing coating and a preparation method thereof.

Background

In recent years, with the increasing of the living standard of people and the improving of living environment, the indoor decoration becomes luxurious and beautiful, and the problem that the indoor pollution caused by the decoration affects the human health is more and more. Most of the finishing materials contain urea resin, phenol resin, melamine resin, etc., and when these materials are heated, formaldehyde is decomposed. Formaldehyde is a medium toxic substance, has great harm to human health, has the main effects of abnormal smell, stimulation, allergy, abnormal lung function, abnormal liver function, abnormal immune function and the like, can cause neurasthenia symptoms such as hypomnesis, lethargy and the like after being contacted with formaldehyde for a long time at a low dose, and can cause mutation of genetic substances and damage chromosomes. Therefore, the method efficiently and durably purifies the indoor harmful gas formaldehyde and keeps fresh and healthy life and working environment, which is the more and more urgent target of people.

At present, the coating in the prior art does not have the effect of removing formaldehyde in indoor air. The formaldehyde gas treatment method mainly comprises a physical adsorption method, a chemical reaction method, a catalytic oxidation method, a biological method, a composite method and a cold plasma method. Compared with various methods, the photocatalytic oxidation method has the advantages of being capable of being used at room temperature, low in energy consumption, free of secondary pollution and the like, and is a novel method for purifying air with a wide prospect, so that the photocatalytic oxidation method has a wide application prospect in the aspects of disinfection and sterilization of drinking water, deep treatment of various kinds of hardly biodegradable organic wastewater, industrial and domestic wastewater and the like.

However, the existing formaldehyde-removing paint has a common formaldehyde-removing effect, and the paint has low performance and low performance, so that the requirement of the market cannot be met.

Disclosure of Invention

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides a nano photocatalyst formaldehyde-removing coating, aiming at solving the problem of poor performance of the existing formaldehyde-removing coating.

The embodiment of the invention is realized in such a way that the nano photocatalyst formaldehyde-removing coating comprises the following raw materials in parts by weight: 26-38 parts of organic component, 13-18 parts of modified nano titanium dioxide, 8-16 parts of modified wollastonite powder, 5-10 parts of fluorocarbon emulsion, 6-12 parts of microencapsulated red phosphorus, 1-2 parts of film-forming assistant, 1-3 parts of vegetable essential oil, 0.1-0.6 part of flatting agent, 0.1-0.5 part of ultraviolet absorbent, 2-6 parts of dispersant and 1-3 parts of defoaming agent.

As a further scheme of the invention: the organic component is selected from one or more of poly-3-hydroxy-butenoic acid-2-ethylene methacrylate, waterborne polyurethane and waterborne polyacrylate.

As a further scheme of the invention: the plant essential oil is selected from one or more of oleum Lavandula Angustifolia, oleum Caryophylli, thyme oil, lemon oil, tea tree oil, and evening primrose oil.

As a further scheme of the invention: the dispersing agent is vinyl bis stearamide; the ultraviolet absorbent is phenyl salicylate or ultraviolet absorbent UV-P; the film forming assistant is selected from propylene glycol, methyl ether, propylene glycol butyl ether and alcohol ester twelve; the defoaming agent is emulsified silicone oil, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, and the weight ratio of the defoaming agent to the silicone oil is 1: 1: 2, mixing; the leveling agent is one or a mixture of more than two of polyacrylic acid, carboxymethyl cellulose and polyether polyester modified organic siloxane.

As a further scheme of the invention: the nano titanium dioxide is prepared by the following method: preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4-4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, adding a KH-570 silane coupling agent, placing in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3h under the stirring condition; filtering and washing, extracting the separated solid with 300ml of absolute ethyl alcohol for 6h, drying at 100-110 ℃ for 8h, and crushing to obtain the modified nano titanium dioxide after being treated with the KH-570 silane coupling agent.

As a further scheme of the invention: the mass ratio of the KH-570 silane coupling agent to the nano titanium dioxide powder is 1: (3-5).

As a further scheme of the invention: the preparation method of the modified wollastonite powder comprises the following steps: dispersing wollastonite powder in ethanol, adding silane coupling agent KH55, stirring at 40-60 deg.C for reaction for 3-5 hr, centrifuging, and oven drying at 70-80 deg.C for 15-18 hr to obtain modified wollastonite powder.

As a further scheme of the invention: the mass ratio of the wollastonite powder to the ethanol to the silane coupling agent KH55 is 5 (8-10) to 0.01-0.03.

As a further scheme of the invention: the feed comprises the following raw materials in parts by weight: 32 parts of organic component, 15 parts of modified nano titanium dioxide, 13 parts of modified wollastonite powder, 8 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of film-forming assistant, 2 parts of plant essential oil, 0.4 part of flatting agent, 0.3 part of ultraviolet absorbent, 4 parts of dispersing agent and 1 part of defoaming agent.

A preparation method of a nano photocatalyst formaldehyde-removing coating comprises the following steps:

1) weighing the following raw materials in parts by weight: 26-38 parts of organic component, 13-18 parts of modified nano titanium dioxide, 8-16 parts of modified wollastonite powder, 5-10 parts of fluorocarbon emulsion, 6-12 parts of microencapsulated red phosphorus, 1-2 parts of film-forming assistant, 1-3 parts of vegetable essential oil, 0.1-0.6 part of flatting agent, 0.1-0.5 part of ultraviolet absorbent, 2-6 parts of dispersant and 1-3 parts of defoaming agent;

2) adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder;

3) adding the organic components, the fluorocarbon emulsion and the microencapsulated red phosphorus into a stirrer, stirring for 15-20min, uniformly mixing, then adding into a container, catalyzing for 2-3h by using ultraviolet light with the wavelength range of 350-;

4) adding plant essential oil, film forming auxiliary agent, leveling agent, ultraviolet absorbent, dispersant and defoaming agent into another stirrer, and stirring for 20-30 min;

5) and (4) adding the mixed solution into the stirrer in the step (4), and stirring for 15-30 min.

The fluorocarbon emulsion has excellent water resistance, good weather resistance, stain resistance, no yellowing, alkali resistance, acid rain resistance and salt mist resistance, and can ensure the excellent performance of the coating; the nano titanium dioxide is subjected to photocatalysis to form a photocatalyst which has excellent air purification capacity, particularly formaldehyde absorption capacity, and the basic performance of the coating is further enhanced after the nano titanium dioxide is subjected to modification treatment; the wollastonite powder is modified, so that the activity of the coating can be further enhanced, micro-gaps on interfaces can be filled, the bonding force between the interfaces can be enhanced, the self-sealing property of the coating is improved, and the mechanical property is improved; the film forming auxiliary agent, the plant essential oil, the flatting agent, the ultraviolet absorbent, the dispersing agent, the defoaming agent and the like can improve the film forming capability, the odor removal and sterilization effects, the flame retardance and the basic mechanical property of the coating; microencapsulated red phosphorus can further improve the flame retardant property.

According to the nano photocatalyst formaldehyde removal coating provided by the embodiment of the invention, the nano titanium dioxide and the silica fume are subjected to modification treatment and then are mixed with other components according to the weight part ratio, so that the strength and the performance of the coating can be effectively ensured, and the prepared coating has the advantages of small pollution, high strength, excellent formaldehyde removal capability, corrosion resistance, water resistance, flame retardance and high temperature resistance.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

According to the nano photocatalyst formaldehyde removal coating provided by the embodiment of the invention, the nano titanium dioxide and the silica fume are subjected to modification treatment and then are mixed with other components according to the weight part ratio, so that the strength and the performance of the coating can be effectively ensured, and the prepared coating has the advantages of small pollution, high strength, excellent formaldehyde removal capability, corrosion resistance, water resistance, flame retardance and high temperature resistance.

The technical effects of the nano-photocatalyst formaldehyde-removing coating of the present invention will be further described with reference to the following specific examples, but the specific implementation methods mentioned in these examples are only illustrative and explanatory of the technical solution of the present invention, and do not limit the implementation scope of the present invention, and all modifications and substitutions based on the above principles should be within the protection scope of the present invention.

Example 1

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: 3 KH-570 silane coupling agent, placing in a constant temperature water tank to maintain the reaction temperature at 90 ℃, and reacting for 3h under the condition of stirring; filtering, washing, extracting the separated solid with 300ml absolute ethanol for 6h, drying at 100 deg.C for 8h, and pulverizing to obtain modified nanometer titanium dioxide after KH-570 silane coupling agent; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of 5:8:0.01, dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting for 3 hours at 40 ℃, centrifuging, and drying for 15 hours at 70 ℃ in a vacuum drying oven to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 26 parts of poly (3-hydroxy-butenoic acid) -2-methyl ethylene glycol methacrylate, 13 parts of modified nano titanium dioxide, 8 parts of modified wollastonite powder, 5 parts of fluorocarbon emulsion, 6 parts of microencapsulated red phosphorus, 1 part of propylene glycol, lemon oil, 1 part of tea tree oil and evening primrose oil, 0.1 part of polyacrylic acid and carboxymethyl cellulose, 0.1 part of ultraviolet absorbent UV-P, 2 parts of vinyl bis stearamide and 1 part of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding poly (3-hydroxy-butenoic acid) -2-ethylene methacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 15min, uniformly mixing, then adding into a container, catalyzing for 2h by using ultraviolet light with the wavelength range of 350nm, then adding mixed powder, and stirring for 10min to obtain mixed solution for later use; adding lemon oil, tea tree oil and evening primrose oil, propylene glycol, polyacrylic acid and carboxymethyl cellulose, ultraviolet absorbent UV-P, vinyl bis stearamide, and defoaming agent into another stirrer, and stirring for 20 min; adding the mixed solution into a stirrer, and stirring for 15 min.

Example 2

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: 5 KH-570 silane coupling agent is put in a constant temperature water tank to maintain the reaction temperature at 90 ℃ and react for 3h under the condition of stirring; filtering, washing, extracting the separated solid with 300ml absolute ethanol for 6h, drying at 110 deg.C for 8h, and pulverizing to obtain modified nanometer titanium dioxide after KH-570 silane coupling agent; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of 5:10:0.03, dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting for 5 hours at 60 ℃, centrifuging, and drying for 18 hours at 80 ℃ in a vacuum drying oven to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 38 parts of waterborne polyurethane, 18 parts of modified nano titanium dioxide, 16 parts of modified wollastonite powder, 10 parts of fluorocarbon emulsion, 12 parts of microencapsulated red phosphorus, 2 parts of methyl ether, 3 parts of lavender oil, 0.6 part of polyacrylic acid and carboxymethyl cellulose, 0.5 part of ultraviolet absorbent UV-P, 6 parts of vinyl bis stearamide and 3 parts of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding the waterborne polyurethane, the fluorocarbon emulsion and the microencapsulated red phosphorus into a stirrer, stirring for 20min, uniformly mixing, then adding into a container, catalyzing for 3h by using ultraviolet light with the wavelength of 380nm, then adding the mixed powder, and stirring for 20min to obtain a mixed solution for later use; adding oleum Lavandula Angustifolia, methyl ether, polyacrylic acid and carboxymethyl cellulose, ultraviolet absorbent UV-P, vinyl bis stearamide, and defoaming agent into another stirrer, and stirring for 30 min; adding the mixed solution into a stirrer, and stirring for 30 min.

Example 3

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: 4, putting the KH-570 silane coupling agent in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3 hours under the stirring condition; filtering, washing, extracting the separated solid with 300ml absolute ethanol for 6h, drying at 100 deg.C for 8h, and pulverizing to obtain modified nanometer titanium dioxide after KH-570 silane coupling agent; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of 5:9:0.02, dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting at 50 ℃ for 5 hours, centrifuging, and drying in a vacuum drying oven at 80 ℃ for 16 hours to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 28 parts of water-based polyacrylate, 14 parts of modified nano titanium dioxide, 10 parts of modified wollastonite powder, 7 parts of fluorocarbon emulsion, 9 parts of microencapsulated red phosphorus, 1 part of propylene glycol butyl ether, 1 part of clove oil, 0.2 part of polyacrylic acid and carboxymethyl cellulose, 0.2 part of ultraviolet absorbent UV-P, 2 parts of vinyl bis stearamide and 1 part of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding the water-based polyacrylate, the fluorocarbon emulsion and the microencapsulated red phosphorus into a stirrer, stirring for 20min, uniformly mixing, then adding into a container, catalyzing for 2h by using ultraviolet light with the wavelength of 360nm, then adding the mixed powder, and stirring for 15min to obtain a mixed solution for later use; adding oleum Caryophylli, propylene glycol monobutyl ether, polyacrylic acid and carboxymethyl cellulose, ultraviolet absorbent UV-P, vinyl bis stearamide, and defoaming agent into another stirrer, and stirring for 20 min; adding the mixed solution into a stirrer, and stirring for 20 min.

Example 4

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: 4, putting the KH-570 silane coupling agent in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3 hours under the stirring condition; filtering, washing, extracting the separated solid with 300ml absolute ethanol for 6h, drying at 100 deg.C for 8h, and pulverizing to obtain modified nanometer titanium dioxide after KH-570 silane coupling agent; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of 5:9:0.02, dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting at 50 ℃ for 5 hours, centrifuging, and drying in a vacuum drying oven at 80 ℃ for 16 hours to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 34 parts of waterborne polyurethane and waterborne polyacrylate, 16 parts of modified nano titanium dioxide, 15 parts of modified wollastonite powder, 9 parts of fluorocarbon emulsion, 11 parts of microencapsulated red phosphorus, 2 parts of alcohol ester, 2 parts of clove oil and thyme oil, 0.5 part of polyether polyester modified organosiloxane, 0.4 part of phenyl salicylate, 5 parts of vinyl bis stearamide and 2 parts of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 20min, uniformly mixing, then adding into a container, catalyzing for 2h by using ultraviolet light with the wavelength of 360nm, then adding mixed powder, and stirring for 15min to obtain mixed liquid for later use; adding clove oil, thyme oil, alcohol ester dodeca, polyether polyester modified organic siloxane, phenyl salicylate, vinyl bis stearamide and defoaming agent into another stirrer and stirring for 20 min; adding the mixed solution into a stirrer, and stirring for 20 min.

Example 5

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: 4, putting the KH-570 silane coupling agent in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3 hours under the stirring condition; filtering, washing, extracting the separated solid with 300ml absolute ethanol for 6h, drying at 100 deg.C for 8h, and pulverizing to obtain modified nanometer titanium dioxide after KH-570 silane coupling agent; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of 5:9:0.02, dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting at 50 ℃ for 5 hours, centrifuging, and drying in a vacuum drying oven at 80 ℃ for 16 hours to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 30 parts of waterborne polyurethane and waterborne polyacrylate, 14 parts of modified nano titanium dioxide, 12 parts of modified wollastonite powder, 9 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of lauryl alcohol ester, 1 part of lavender oil, 1 part of clove oil and thyme oil, 0.3 part of carboxymethyl cellulose, 0.2 part of phenyl salicylate, 2 parts of vinyl bis stearamide and 1 part of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 20min, uniformly mixing, then adding into a container, catalyzing for 2h by using ultraviolet light with the wavelength of 360nm, then adding mixed powder, and stirring for 15min to obtain mixed liquid for later use; adding oleum Lavandula Angustifolia, oleum Caryophylli and thyme oil, alcohol ester dodeca, carboxymethyl cellulose, phenyl salicylate, vinyl bisstearamide, and defoaming agent into another stirrer, and stirring for 20 min; adding the mixed solution into a stirrer, and stirring for 20 min.

Example 6

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: 4, putting the KH-570 silane coupling agent in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3 hours under the stirring condition; filtering, washing, extracting the separated solid with 300ml absolute ethanol for 6h, drying at 100 deg.C for 8h, and pulverizing to obtain modified nanometer titanium dioxide after KH-570 silane coupling agent; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of 5:9:0.02, dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting at 50 ℃ for 5 hours, centrifuging, and drying in a vacuum drying oven at 80 ℃ for 16 hours to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 32 parts of waterborne polyurethane and waterborne polyacrylate, 17 parts of modified nano titanium dioxide, 13 parts of modified wollastonite powder, 9 parts of fluorocarbon emulsion, 11 parts of microencapsulated red phosphorus, 1 part of alcohol ester, 1 part of lavender oil, 1 part of clove oil and thyme oil, 0.2 part of polyacrylic acid, 0.2 part of phenyl salicylate, 4 parts of vinyl bis stearamide and 3 parts of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 20min, uniformly mixing, then adding into a container, catalyzing for 2h by using ultraviolet light with the wavelength of 360nm, then adding mixed powder, and stirring for 15min to obtain mixed liquid for later use; adding oleum Lavandula Angustifolia, oleum Caryophylli and thyme oil, alcohol ester dodeca, polyacrylic acid, phenyl salicylate, vinyl bisstearamide, and defoaming agent into another stirrer, and stirring for 20 min; adding the mixed solution into a stirrer, and stirring for 20 min.

Example 7

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4-4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: (3-5) placing the KH-570 silane coupling agent in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3 hours under the stirring condition; filtering and washing, extracting the separated solid with 300ml of absolute ethyl alcohol for 6h, drying at 100-110 ℃ for 8h, and crushing to obtain modified nano titanium dioxide subjected to KH-570 silane coupling agent for later use; taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of (8-10) to (0.01-0.03), dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting for 3-5 hours at 40-60 ℃, centrifuging, and drying for 15-18 hours at 70-80 ℃ in a vacuum drying oven to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 32 parts of waterborne polyurethane and waterborne polyacrylate, 15 parts of modified nano titanium dioxide, 13 parts of modified wollastonite powder, 8 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of alcohol ester, 2 parts of lavender oil, clove oil and thyme oil, 0.4 part of polyacrylic acid, 0.3 part of phenyl salicylate, 4 parts of vinyl bis stearamide and 1 part of defoaming agent; adding the modified nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 15-20min, uniformly mixing, then adding into a container, catalyzing for 2-3h by using ultraviolet light with the wavelength range of 350-380nm, then adding mixed powder, and stirring for 10-20min to obtain mixed solution for later use; adding oleum Lavandula Angustifolia, oleum Caryophylli and thyme oil, alcohol ester dodeca, polyacrylic acid, phenyl salicylate, vinyl bisstearamide, and defoaming agent into another stirrer, and stirring for 20-30 min; and (4) adding the mixed solution into the stirrer in the step (4), and stirring for 15-30 min.

Comparative example 1

Taking wollastonite powder, ethanol and a silane coupling agent KH55 according to the mass ratio of (8-10) to (0.01-0.03), dispersing the wollastonite powder in the ethanol, adding the silane coupling agent KH55, stirring and reacting for 3-5 hours at 40-60 ℃, centrifuging, and drying for 15-18 hours at 70-80 ℃ in a vacuum drying oven to obtain modified wollastonite powder for later use; weighing the following raw materials in parts by weight: 32 parts of waterborne polyurethane and waterborne polyacrylate, 15 parts of nano titanium dioxide, 13 parts of modified wollastonite powder, 8 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of alcohol ester, 2 parts of lavender oil, clove oil and thyme oil, 0.4 part of polyacrylic acid, 0.3 part of phenyl salicylate, 4 parts of vinyl bis stearamide and 1 part of defoaming agent; adding the nano titanium dioxide and the modified wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 15-20min, uniformly mixing, then adding into a container, catalyzing for 2-3h by using ultraviolet light with the wavelength range of 350-380nm, then adding mixed powder, and stirring for 10-20min to obtain mixed solution for later use; adding oleum Lavandula Angustifolia, oleum Caryophylli and thyme oil, alcohol ester dodeca, polyacrylic acid, phenyl salicylate, vinyl bisstearamide, and defoaming agent into another stirrer, and stirring for 20-30 min; and (4) adding the mixed solution into the stirrer in the step (4), and stirring for 15-30 min.

Comparative example 2

Preparing 60g/L suspension of the nano titanium dioxide powder coated on the surface of the silicon dioxide by using deionized water, and adjusting the pH value to 4-4.5 by using a 5% acetic acid solution; dispersing the suspension for 20min by using an emulsifying machine, then ultrasonically dispersing for 40min by using a 250w ultrasonic crusher, transferring into a three-neck flask, and adding titanium dioxide powder with the mass ratio of 1: (3-5) placing the KH-570 silane coupling agent in a constant-temperature water tank, maintaining the reaction temperature at 90 ℃, and reacting for 3 hours under the stirring condition; filtering and washing, extracting the separated solid with 300ml of absolute ethyl alcohol for 6h, drying at 100-110 ℃ for 8h, and crushing to obtain modified nano titanium dioxide subjected to KH-570 silane coupling agent for later use; weighing the following raw materials in parts by weight: 32 parts of waterborne polyurethane and waterborne polyacrylate, 15 parts of modified nano titanium dioxide, 13 parts of wollastonite powder, 8 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of alcohol ester, 2 parts of lavender oil, clove oil and thyme oil, 0.4 part of polyacrylic acid, 0.3 part of phenyl salicylate, 4 parts of vinyl bis stearamide and 1 part of defoaming agent; adding the modified nano titanium dioxide and the wollastonite powder into a grinder, grinding for 10min, and sieving by a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 15-20min, uniformly mixing, then adding into a container, catalyzing for 2-3h by using ultraviolet light with the wavelength range of 350-380nm, then adding mixed powder, and stirring for 10-20min to obtain mixed solution for later use; adding oleum Lavandula Angustifolia, oleum Caryophylli and thyme oil, alcohol ester dodeca, polyacrylic acid, phenyl salicylate, vinyl bisstearamide, and defoaming agent into another stirrer, and stirring for 20-30 min; and (4) adding the mixed solution into the stirrer in the step (4), and stirring for 15-30 min.

Comparative example 3

Weighing the following raw materials in parts by weight: 32 parts of waterborne polyurethane and waterborne polyacrylate, 15 parts of nano titanium dioxide, 13 parts of wollastonite powder, 8 parts of fluorocarbon emulsion, 10 parts of microencapsulated red phosphorus, 1 part of alcohol ester, 2 parts of lavender oil, clove oil and thyme oil, 0.4 part of polyacrylic acid, 0.3 part of phenyl salicylate, 4 parts of vinyl bis stearamide and 1 part of defoaming agent; adding nano titanium dioxide and wollastonite powder into a grinder, grinding for 10min, and sieving with a 200-mesh sieve to obtain mixed powder; adding waterborne polyurethane, waterborne polyacrylate, fluorocarbon emulsion and microencapsulated red phosphorus into a stirrer, stirring for 15-20min, uniformly mixing, then adding into a container, catalyzing for 2-3h by using ultraviolet light with the wavelength range of 350-380nm, then adding mixed powder, and stirring for 10-20min to obtain mixed solution for later use; adding oleum Lavandula Angustifolia, oleum Caryophylli and thyme oil, alcohol ester dodeca, polyacrylic acid, phenyl salicylate, vinyl bisstearamide, and defoaming agent into another stirrer, and stirring for 20-30 min; and (4) adding the mixed solution into the stirrer in the step (4), and stirring for 15-30 min.

Examples of the experiments

The coatings prepared in examples 1 to 7 and comparative examples 1 to 3 were subjected to performance tests according to the test method and test standard in GB14907-2002, and the test results are shown in Table 1.

TABLE 1

The results show that the coatings prepared in the examples 1 to 7 of the invention have high strength, corrosion resistance, water resistance, flame retardance and high temperature resistance, and compared with the coatings of the comparative examples 1 to 3, the strength and the corrosion resistance of the coatings are further enhanced by modifying the nano titanium dioxide and the silica ash.

In summary, the nano photocatalyst formaldehyde-removing coating provided by the embodiment of the invention can effectively ensure the strength and performance of the coating by modifying the nano titanium dioxide and the silica ash powder and mixing the modified nano titanium dioxide and the silica ash powder with other components according to the weight part ratio, and the prepared coating has the advantages of small pollution, high strength, excellent formaldehyde-removing capability, corrosion resistance, water resistance, flame retardance and high temperature resistance.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.