Preparation method of photocatalytic air purification coating

Abstract

The invention provides a preparation method of a photocatalytic air purification coating. The preparation method of the photocatalytic air purification coating comprises the following steps: S1, preparing the lavender extract; s2, 2000-4000 ml of silicone acrylic emulsion is poured into the stirring kettle, and stirring is conducted for 15-18 min at the temperature of 38-40 DEG C; after stirring is finished, 2-4 g of powdery bismuth, 120-140 g of polypyrrole, 40-60 ml of an organic acid salt solvent, 30-50 ml of a functional additive and 10-13 ml of an acrylate copolymer are sequentially added into the stirring kettle, and stirring is conducted for 42-45 min at the temperature of 68-70 DEG C; adding 500-700g of nano titanium dioxide after the stirring is finished, stirring for 58-60 minutes at the temperature of 112-115 DEG C, adding 36-38g of superfine tourmaline powder when the stirring is performed for 30-32 minutes, and adding 65-67g of lavender extract when the stirring is performed for 50-53 minutes; after the stirring is finished, adding color paste, and stirring at 60-62 DEG C for 10-12 minutes; and adding 10-13ml of a dispersing agent after stirring is finished, stirring for 20-23 minutes, and filtering to obtain the photocatalytic air purification coating. The prepared photocatalytic air purification coating can be subjected to photocatalytic reaction with pollutants in air, so that the air purification effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of photocatalytic air purification coatings, and in particular to a preparation method of photocatalytic air purification coatings. Background Art

[0002] Photocatalytic air purification paint is a special paint that contains photocatalyst ingredients and can produce photocatalytic reactions under light conditions, thereby achieving multiple functions such as air purification, sterilization, and deodorization. Photocatalytic air purification paint can decompose harmful organic matter and odorous substances in the air into harmless water and carbon dioxide, thereby effectively improving indoor or outdoor air quality.

[0003] Some photocatalytic air purification paints have a low photocatalyst content, which makes them less effective in purifying indoor air quality. When they are applied on walls, they produce less photocatalytic reaction under light conditions. Photocatalysts are usually present in the paint in the form of nanoparticles. However, nanoparticles are prone to agglomeration, resulting in uneven dispersion in the paint, which in turn affects the efficiency and effect of the photocatalytic reaction.

[0004] Therefore, we proposed a preparation method of a photocatalytic air purification coating to solve the above problems. Summary of the invention

[0005] The invention provides a method for preparing a photocatalytic air-purifying coating. The prepared photocatalytic air-purifying coating can undergo a photocatalytic reaction with pollutants in the air to achieve an air purification effect.

[0006] The present invention provides a method for preparing a photocatalytic air purification coating, comprising the following steps:

[0007] S1: preparation of lavender extract, selecting, washing, extracting, concentrating, powdering and drying lavender to obtain lavender extract;

[0008] S2: Pour 2000-4000ml of silicone-acrylic emulsion into a stirring kettle and stir at 38-40°C for 15-18min;

[0009] After the stirring is completed, 2-4 g of powdered bismuth, 120-140 g of polypyrrole, 40-60 ml of organic acid salt solvent, 30-50 ml of functional additive and 10-13 ml of acrylate copolymer are added to the stirring kettle in sequence, and stirred at 68-70° C. for 42-45 min;

[0010] After stirring, add 500-700g of nano titanium dioxide, stir at 112-115°C for 58-60min, add 36-38g of ultrafine tourmaline powder when stirring for 30-32min, and add 65-67g of lavender extract when stirring for 50-53min;

[0011] After stirring, add color paste and stir at 60-62℃ for 10-12min;

[0012] After stirring, add 10-13 ml of dispersant, stir for 20-23 minutes, filter, and obtain the photocatalytic air purification coating.

[0013] Preferably, the lavender in step S1 includes Lavandula angustifolia.

[0014] In the present invention, in the process of preparing the photocatalytic air purification coating, polypyrrole is used to coat nano titanium dioxide to form a protective layer, which can prevent direct contact between nanoparticles, reduce the occurrence of agglomeration, and improve the photocatalytic efficiency of nanoparticles; through the coating treatment, the photocatalytic performance of nano titanium dioxide can be significantly improved, so that the nanoparticles can also work effectively under visible light.

[0015] In addition, the ammonium polyacrylate dispersant added during the preparation process can form an adsorption layer on the surface of the nanoparticles, preventing the agglomeration of the nanoparticles through steric hindrance or electrostatic repulsion, which can effectively prevent the agglomeration of nano-titanium dioxide, and the added ultrafine tourmaline powder can improve the air purification effect when the nano-titanium dioxide content is low. In addition, by adding lavender extract during the preparation process to reduce the irritating odor brought by other materials, the overall odor of the coating is more pleasant.

[0016] Preferably, calculated by weight, the raw materials used to prepare the functional additive in step S2 include 5-7 parts of defoaming agent and 2-4 parts of film-forming additive.

[0017] Preferably, the stirring speed in step S3 is 200-600 rpm.

[0018] Preferably, the filtration accuracy in step S3 is 220-250 meshes.

[0019] Preferably, the dispersant in step S3 comprises an ammonium polyacrylate dispersant. DETAILED DESCRIPTION

[0020] The following is a further clear and complete description of the technical features in the technical solution provided by the present invention in conjunction with the specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] This embodiment provides a photocatalytic air purification coating, and the preparation method of the coating comprises the following steps:

[0023] S1: preparation of lavender extract, selecting, washing, extracting, concentrating, powdering and drying lavender to obtain lavender extract;

[0024] S2: Pour 2000 ml of silicone-acrylic emulsion into a stirring kettle and stir at 38°C for 15 min;

[0025] After the stirring is completed, 2 g of powdered bismuth, 120 g of polypyrrole, 40 ml of organic acid salt solvent, 30 ml of functional additive and 10 ml of acrylate copolymer are added to the stirring kettle in sequence, and stirred at 68°C for 42 min;

[0026] After the stirring was completed, 500 g of nano titanium dioxide was added, and the mixture was stirred at 112° C. for 58 min. At the same time, 36 g of ultrafine tourmaline powder was added after stirring for 30 min, and 65 g of the lavender extract was added after stirring for 50 min.

[0027] After stirring, add color paste and stir at 60°C for 10 minutes;

[0028] After stirring, add 10 ml of dispersant, stir for 20 minutes, filter, and obtain the photocatalytic air purification coating.

[0029] Example 2

[0030] This embodiment provides a photocatalytic air purification coating, and the preparation method of the coating comprises the following steps:

[0031] S1: preparation of lavender extract, selecting, washing, extracting, concentrating, powdering and drying lavender to obtain lavender extract;

[0032] S2: Pour 3000 ml of silicone-acrylic emulsion into a stirring kettle and stir at 39°C for 17 min;

[0033] After the stirring was completed, 3 g of powdered bismuth, 130 g of polypyrrole, 50 ml of organic acid salt solvent, 40 ml of functional additive and 12 ml of acrylate copolymer were added to the stirring kettle in sequence, and stirred at 69° C. for 44 min;

[0034] After the stirring was completed, 600 g of nano titanium dioxide was added, and the mixture was stirred at 114° C. for 59 min. At the same time, 37 g of ultrafine tourmaline powder was added when the stirring lasted for 31 min, and 66 g of the lavender extract was added when the stirring lasted for 52 min.

[0035] After stirring, add color paste and stir at 61°C for 11 minutes;

[0036] After stirring, add 12 ml of dispersant, stir for 22 minutes, filter, and obtain the photocatalytic air purification coating.

[0037] Example 3

[0038] This embodiment provides a photocatalytic air purification coating, and the preparation method of the coating comprises the following steps:

[0039] S1: preparation of lavender extract, selecting, washing, extracting, concentrating, powdering and drying lavender to obtain lavender extract;

[0040] S2: Pour 4000 ml of silicone-acrylic emulsion into a stirring kettle and stir at 40°C for 18 min;

[0041] After the stirring was completed, 4 g of powdered bismuth, 140 g of polypyrrole, 60 ml of organic acid salt solvent, 50 ml of functional additive and 13 ml of acrylate copolymer were added to the stirring kettle in sequence, and stirred at 70°C for 45 min;

[0042] After the stirring was completed, 700 g of nano titanium dioxide was added, and the mixture was stirred at 115° C. for 60 min. At the same time, 38 g of ultrafine tourmaline powder was added when the stirring lasted for 32 min, and 67 g of the lavender extract was added when the stirring lasted for 53 min.

[0043] After stirring, add color paste and stir at 62°C for 12 minutes;

[0044] After stirring, add 13 ml of dispersant, stir for 23 minutes, filter, and obtain the photocatalytic air purification coating.

[0045] Example 4

[0046] This embodiment provides a photocatalytic air purification coating, and compared with the embodiment 1, the difference in structure is that no ultrafine tourmaline powder is added to the raw materials used to prepare the above coating. In addition to the above difference, the materials, formula ratios and preparation operations used in this embodiment are strictly consistent with those in the embodiment 1.

[0047] Test Case

[0048] 1. Test subjects

[0049] Examples 1 to 3 provide photocatalytic air purification coatings.

[0050] 2. Test content

[0051] (1) Formaldehyde purification efficiency

[0052] Refer to building materials standard JCT1074-2008.

[0053] 3. Test results

[0054]

[0055] In the present invention, by adding the dry concentrated powder made of lavender extract, the paint has fragrance when used, polypyrrole is used to coat nano titanium dioxide, so that a protective layer can be formed to prevent direct contact between nano particles and reduce the occurrence of agglomeration, and the provided ammonium polyacrylate dispersant enables the dispersant to form an adsorption layer on the surface of the nano particles, and the agglomeration of the nano particles is prevented by the steric hindrance effect or the electrostatic repulsion effect, so that the agglomeration of the nano titanium dioxide can be effectively prevented, and the added ultrafine tourmaline powder can improve the air purification effect when the content of the nano titanium dioxide is small.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the technical solutions of the present invention can be modified or equivalently replaced, but these modifications or replacements are all within the protection scope of the present invention.

Claims

1. A method for preparing a photocatalytic air purification coating, characterized in that: The following steps are involved: S1: preparation of lavender extract, selecting, washing, extracting, concentrating, powdering and drying lavender to obtain lavender extract; S2: Pour 2000-4000ml of silicone-acrylic emulsion into a stirring kettle and stir at 38-40°C for 15-18min; After the stirring is completed, 2-4 g of powdered bismuth, 120-140 g of polypyrrole, 40-60 ml of organic acid salt solvent, 30-50 ml of functional additive and 10-13 ml of acrylate copolymer are added to the stirring kettle in sequence, and stirred at 68-70° C. for 42-45 min; After the stirring is completed, 500-700 g of nano titanium dioxide is added, and the mixture is stirred at 112-115° C. for 58-60 min. At the same time, 36-38 g of ultrafine tourmaline powder is added when the stirring time reaches 30-32 min, and 65-67 g of the lavender extract is added when the stirring time reaches 50-53 min. After stirring, add color paste and stir at 60-62℃ for 10-12min; After stirring, add 10-13 ml of dispersant, stir for 20-23 minutes, filter, and obtain the photocatalytic air purification coating.

2. The preparation method according to claim 1, characterized in that The lavender described in step S1 includes Lavandula angustifolia.

3. The preparation method according to claim 1, characterized in that: Calculated by weight, the raw materials used to prepare the functional additive in step S2 include 5-7 parts of defoaming agent and 2-4 parts of film-forming additive.

4. The preparation method according to claim 1, characterized in that: The stirring speed of the stirring in step S3 is 200-600 rpm.

5. The preparation method according to claim 1, characterized in that: The filtration accuracy in step S3 is 220-250 meshes.

6. The preparation method according to claim 1, characterized in that: The dispersant in step S3 includes ammonium polyacrylate dispersant.

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