CN101413212B - Method for preparing air self-purifying function fabric of photochemical catalyst coating - Google Patents

Abstract

The invention relates to a method for preparing air auto-purification functional fabrics with a photocatalyzed coating, which comprises the following steps: firstly, a base cloth is subjected to surface treatment by an organic solution at a temperature of between 60 and 70 DEG C; secondly, deionized water, methanol and ether are taken as dispersing reagent of a fiber protecting agent, the pH value of the dispersing protecting agent is adjusted to between 9.5 and 11.5 by ammonia, and the base cloth is immersed in the dispersing protecting agent for more than 6 to 8 hours at a temperature of between 30 and 40 DEG C; thirdly, the base cloth is treated for 10 to 15 minutes by an ethylenediaminetetraacetic acid and a phytate aqueous solution; and fourthly, photocatalyst is added in a coating agent, and the coating agent is then directly coated on the base cloth by a scraper with the coating amount between 6 and 15 grams per square meter, and dried for 2 to 4 minutes at a temperature of between 110 and 120 DEG C to obtain the air auto-purification functional fabrics. The air auto-purification functional fabrics have good air purification effect; the preparation technology is simple; andthe method is easy to operate and is used for industrial mass production.

Description

Preparation method of photocatalytic coated air self-purifying functional fabric

technical field

The invention belongs to the field of preparation of air self-purifying functional fabrics, in particular to a preparation method of photocatalytic coated air self-purifying functional fabrics.

Background technique

In recent years, with the improvement of living standards, a large number of new decorative materials, furniture and daily necessities have continuously entered the room, and the resulting indoor environmental pollution has become increasingly serious. Aiming at the increasingly serious indoor air pollution, scientific researchers are actively involved in the prevention and purification of indoor air pollution, and a large number of indoor air purification technologies and related products have emerged. Many scientific researchers have successively researched and developed a variety of air purification materials. Among them, the air purification materials based on photocatalytic technology are characterized by their high photocatalytic degradation activity for organic gaseous pollutants and deep mineralization into inorganic small molecule terminal products. It has become a category of many new purification materials that has attracted much attention. Some practical products of this type of material, such as photocatalytic air purifiers, self-cleaning paints, and self-cleaning tiles, have been launched on the market.

At present, the materials used for air purification are mainly to use ultra-fine titanium dioxide powder placed in the purification channel composed of metal mesh and filter cloth or to fix titanium dioxide powder on glass, ceramics and other carriers with binders to achieve air purification. Since the concentration of indoor air pollutants is generally very low, the adsorption of powder TiO ₂ itself is poor, and the reaction efficiency is not high when dealing with low-concentration systems. In order to solve these problems, adsorptive substances are selected as the carrier (such as activated carbon) to load TiO ₂ , and through the adsorption of the adsorptive carrier, a relatively high concentration environment of pollutants is formed around TiO ₂ , but most of these adsorptive carriers themselves are also powders. , the supported catalyst obtained after loading TiO ₂ is still a powder, which will generate dust pollution when used in a gas phase system, and is not suitable for indoor air treatment. Therefore, it needs to be reloaded on the support or in the photoreactor in actual use. The current reloading is generally simple bonding, which is very effective in a short time, but long-term ultraviolet light irradiation can cause the adhesive to decompose itself under the action of the photocatalyst, causing the catalyst to fall off and affecting the effect.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a photocatalytic coated air self-purifying functional fabric. The air self-purifying functional fabric of the present invention has good air purification effect, simple preparation process, easy operation, and can be operated in the laboratory. , can also be used for industrial scale production.

A preparation method of a photocatalytic coated air self-purifying functional fabric of the present invention, comprising:

(1) Use an organic solution to clean the surface of the base cloth with ultrasonic waves at 60-70°C for 20-40 minutes, wash it with boiling water for 2-4 times, wash it with household detergent for 1-3 times, and dry it;

(2) Deionized water, methanol and ether are configured in a volume ratio of 7 to 10:16 to 20:10 to 12, used as a dispersing agent for a fiber protective agent to form a dispersed protection system, and ammonia water is used to adjust the pH value of the dispersed protection system In the range of 9.5 to 11.5, shake in an ultrasonic cleaner at 20 to 30°C for 15 to 25 minutes to make it evenly dispersed, and then soak the base cloth in a dispersion protection system at about 30 to 40°C for more than 6 to 8 hours to make the two Fully adsorb between the two, wash off the mechanically deposited fiber protective agent on the base cloth with distilled water, and then bake to combine the fiber protective agent and the fibers on the base cloth;

(3) Treat the base cloth with ethylenediaminetetraacetic acid with a mass percentage concentration of 1% to 3% and a phytic acid aqueous solution with a mass percentage concentration of 2% to 6% at room temperature for 10 to 15 minutes;

(4) Add a photocatalyst to the coating agent, apply it directly on the base fabric with a doctor blade, the coating amount is 6-15g/m ² , dry at 110°C-120°C for 2-4min, and obtain the air self-purifying functional fabric.

The base fabric is non-woven fabric, woven fabric or knitted fabric, and its density is 0.20～0.30g/cm ³ ;

The fibers of the base cloth are selected from one or a mixture of cotton fibers, polyimide fibers, polyester fibers, polypropylene fibers, and nylon fibers, and the linear density of the fibers is 1.8 to 3.0 dtex;

The organic solution in the step (1) is 0.3-0.5g/l ethanol, 0.05-0.15g/l acetone, 0.2-0.4g/l oxalic acid or 0.3-0.5g/l chloroform;

The fiber protective agent in the step (2) is vinyl triethoxy silane, γ-aminopropyl triethoxy silane, γ glycidoxypropyl trimethoxy silane, γ-methacryloxy Propyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, polydimethylsiloxane, 2,4-hexafluorovinylmethylsiloxane, polyvinyl fluoride or hydroxyapatite ;

The photocatalyst in the step (4) is a porous nano metal particle modified by silver and iron compound doping, silver and aluminum compound doping modification or lanthanum and iron compound doping modification, and its pore diameter is 6-16 nm;

The nano-metal particles are selected from one or a mixture of TiO ₂ , CdS, ZnS, WO ₃ , SnO ₂ , V2O ₅ , BiVO4, and the particle size of the metal nanoparticles is 6-90nm;

The coating agent in the step (4) is a mixture of silicone, solvent-based polyacrylate, solvent, catalyst and dispersant, and its mass ratio is sequentially 4-6:8-10:10-16:3-5: 2～4;

The dispersant is a compound of a polysilyl ether surfactant and a silicone-modified polyvinyl alcohol surfactant, and the mass ratio of the compound is 1:3 to 3:5;

Described catalyst is ammonium nitrate, ammonium sulfate, ammonium phosphate, ammonium carbonate, ammonium dihydrogen phosphate or ammonium chloride;

The solvent is a mixture of water and ether with a mass ratio of 3:1-5:1.

The invention fixes the semiconductor nanoparticles on the fiber fabric, which not only solves the dust pollution problem of the photocatalyst in air purification, but also avoids the degradation of the matrix material by the photocatalyst. The photocatalyst coating on the surface of the air self-purifying fabric is highly hydrophilic and can form an anti-fog coating. At the same time, due to its strong oxidation, it can oxidize the pollutants on the surface and keep itself clean. The fabric can pass light under visible light Catalytically degrades toxic gases and turns them into non-toxic and odorless substances, which can achieve the purpose of purifying the air efficiently and quickly.

The prepared air self-purifying functional fabric can be used in submarines, interior decoration, automobile interior decoration, hospital wards and other occasions, and has broad application prospects.

Beneficial effect

(1) The air self-purifying functional fabric of the present invention has good air purification effect, no secondary pollution, and can be used for a long time;

(2) The preparation method is simple, low in cost, convenient for laboratory production, and can be used for industrial production.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

(1) Pretreatment of the base cloth surface:

Use a solution containing 0.3g/l ethanol or 0.05g/l acetone or 0.2g/l oxalic acid or 0.3g/l chloroform to ultrasonically clean the surface of cotton fabrics at 60°C for 20 minutes, wash twice with boiling water, and wash once with household detergent time, drying;

Use a volume ratio of 7:16:10 deionized water, methanol and ether as the dispersing agent of the fiber protection agent, adjust the pH value of the dispersion protection system to about 9.5 with ammonia water, and shake it in an ultrasonic cleaner at 20°C for 15 minutes to make it Disperse evenly, and then soak the fabric in the dispersion protection system at about 30°C for more than 6 hours to make the two fully adsorb, wash off the mechanically deposited fiber protection agent on the fabric with distilled water, and then bake the fiber protection agent and fabric Fibers bond to each other;

Treat the base fabric with an aqueous solution containing 1% to 3% ethylenediaminetetraacetic acid and 2% to 6% phytic acid at room temperature for 10 to 15 minutes;

(2) Preparation of air self-purifying functional fabric:

The photocatalyst is added to the coating agent, directly coated on the base cloth with a scraper, at 6-15g/m ² , and dried at 110°C for 2 minutes to obtain an air self-purifying functional fabric.

Among them, the density of the base cloth is 0.20g/cm ³ , the linear density of the fiber used for the base cloth is 1.8dtex; the particle diameter of semiconductor nanoparticles is 6nm, and the pore diameter of porous nanoparticles is 6nm; the multi-coating agent is made of silicone , solvent-based polyacrylate, solvent, catalyst, and dispersant, with a mass ratio of 4:8:10:3:2; the dispersant is a polysilyl ether-type surfactant and a silicone-modified polyvinyl alcohol surfactant The compound, the compound mass ratio is 1:3; the solvent in the coating is composed of water and ether, the mass ratio is 3:1.

The air self-purifying functional fabric prepared by the present invention and the common activated carbon air-purifying material are respectively loaded into the same type of air purifier, and under the same conditions: including space, harmful gas concentration and time are compared and tested, and the results are as follows :

Example 2

A preparation method of a photocatalytic coated air self-purifying functional fabric, the specific steps are:

(1) Pretreatment of the base cloth surface:

Use a solution containing 0.4g/l ethanol or 0.1g/l acetone or 0.3g/l oxalic acid or 0.4g/l chloroform to clean the surface of the base cloth with ultrasonic waves at 65°C for 30 minutes, wash with boiling water for 3 times, and wash with household detergent for 2 time, drying;

Use a volume ratio of 8.5:18:11 deionized water, methanol and ether as the dispersing agent of the fiber protection agent, adjust the pH value of the dispersion protection system to about 10.5 with ammonia water, and shake it in an ultrasonic cleaner at 25°C for 20 minutes to make it Disperse evenly, and then soak the base cloth in the dispersion protection system at about 35°C for more than 7 hours to make the two fully adsorb, wash off the mechanically deposited fiber protection agent on the fabric with distilled water, and then bake the fiber protection agent and The fabric fibers are bonded to each other;

Treat the base fabric with an aqueous solution containing 1% to 3% ethylenediaminetetraacetic acid and 2% to 6% phytic acid at room temperature for 10 to 15 minutes;

(2) Preparation of air self-purifying functional fabric:

The photocatalyst is added to the coating agent, and directly coated on the base cloth with a scraper, at 6-15g/m ² , and dried at 115°C for 3 minutes to obtain an air self-purifying functional fabric.

Among them, the base fabric is composed of non-woven fabric with a density of 0.25g/cm ³ , and the linear density of the fibers used in the base fabric is 2.4dtex; the particle diameter of semiconductor nanoparticles is 15nm, and the pore diameter of porous nanoparticles is 10nm; The layer agent is composed of silicone, solvent-based polyacrylate, solvent, catalyst, and dispersant, with a mass ratio of 5:9:13:4:3; the dispersant is polysiloxane-type surfactant and silicone-modified polyacrylate The compound of vinyl alcohol surfactant has a mass ratio of 1:2; the solvent in the coating is composed of water and ether, and the mass ratio is 4:1.

The air self-purifying functional fabric prepared by the present invention and the common activated carbon air-purifying material are respectively loaded into the same type of air purifier, and under the same conditions: including space, harmful gas concentration and time are compared and tested, and the results are as follows :

Example 3

(1) Pretreatment of the base cloth surface:

Use a solution containing 0.5g/l ethanol or 0.15g/l acetone or 0.4g/l oxalic acid or 0.5g/l chloroform to clean the surface of the cotton fabric with ultrasonic waves at 70°C for 40 minutes, wash it with boiling water 4 times, and wash it with household detergent for 3 times time, drying;

Use a volume ratio of 10:20:12 deionized water, methanol and ether as the dispersing agent of the fiber protection agent, adjust the pH value of the dispersion protection system to about 11.5 with ammonia water, and shake it in an ultrasonic cleaner at 30°C for 25 minutes to make it Disperse evenly, then soak the fabric in the dispersion protection system at about 40°C for more than 8 hours to make the two fully adsorb, wash off the mechanically deposited fiber protective agent on the fabric with distilled water, and then bake the fiber protective agent and fabric Fibers bond to each other;

Treat the base fabric with an aqueous solution containing 1% to 3% ethylenediaminetetraacetic acid and 2% to 6% phytic acid at room temperature for 10 to 15 minutes;

(2) Preparation of air self-purifying functional fabric:

The photocatalyst is added to the coating agent, and directly coated on the base cloth with a scraper, at 6-15g/m ² , and dried at 120°C for 2 minutes to obtain the air self-purifying functional fabric.

Among them, the density of the base cloth is 0.30g/cm ³ , the linear density of the fiber used for the base cloth is 3.0dtex; the particle diameter of semiconductor nanoparticles is 90nm, and the pore diameter of porous nanoparticles is 11nm; the multi-coating agent is made of silicone , solvent-based polyacrylate, solvent, catalyst, and dispersant, with a mass ratio of 6:10:6:5:4; the dispersant is a polysiloxane-type surfactant and a silicone-modified polyvinyl alcohol surfactant The compound, the compound mass ratio is 3:5; the solvent in the coating is composed of water and ether, the mass ratio is 5:1.

The air self-purifying functional fabric prepared by the present invention and the common activated carbon air-purifying material are loaded into the same type of air purifier respectively, and under the same conditions: including space, harmful gas concentration and time are compared and tested:

Claims (12)

1. A preparation method of photocatalytic coating air self-purifying functional fabric, comprising: (1) Use an organic solution to clean the surface of the base cloth with ultrasonic waves at 60-70°C for 20-40 minutes, wash it with boiling water for 2-4 times, wash it with household detergent for 1-3 times, and dry it; (2) Prepare deionized water, methanol and ether in a volume ratio of 7-10:16-20:10-12, and use it as a dispersing agent for fiber protection agent to form a dispersed protection system, and adjust the pH value of the dispersed protection system with ammonia water In the range of 9.5 to 11.5, shake in an ultrasonic cleaner at 20 to 30°C for 15 to 25 minutes to make it evenly dispersed, and then soak the base cloth in a dispersion protection system at about 30 to 40°C for more than 6 to 8 hours to make the two Fully adsorb between the two, wash off the mechanically deposited fiber protective agent on the base cloth with distilled water, and then bake to combine the fiber protective agent and the fibers on the base cloth; (3) Treat the base cloth with ethylenediaminetetraacetic acid with a mass percentage concentration of 1% to 3% and a phytic acid aqueous solution with a mass percentage concentration of 2% to 6% at room temperature for 10 to 15 minutes; (4) Add a photocatalyst to the coating agent, apply it directly on the base fabric with a doctor blade, the coating amount is 6-15g/m ² , dry at 110°C-120°C for 2-4min, and obtain the air self-purifying functional fabric. 2. The preparation method of a kind of photocatalytic coating air self-purifying functional fabric according to claim 1, characterized in that: the base fabric is non-woven fabric, woven fabric or knitted fabric, and its density is 0.20～ 0.30g/cm ³ . 3. the preparation method of a kind of photocatalytic coating air self-purification functional fabric according to claim 1, is characterized in that: the fiber of described base cloth is selected from cotton fiber, polyimide fiber, polyester fiber, One or a mixture of polypropylene fiber and nylon fiber, the linear density of the fiber is 1.8-3.0dtex. 4. The preparation method of a photocatalytic coated air self-purifying functional fabric according to claim 1, characterized in that: the organic solution in the step (1) is 0.3～0.5g/L ethanol, 0.05～0.15 g/L acetone, 0.2~0.4g/L oxalic acid or 0.3~0.5g/L chloroform. 5. the preparation method of a kind of photocatalytic coating air self-purification functional fabric according to claim 1, is characterized in that: the fiber protection agent in the described step (2) is vinyltriethoxysilane, gamma- Aminopropyltriethoxysilane, γ-Glycidoxypropyltrimethoxysilane, γ-Methacryloxypropyltrimethoxysilane, γ-Mercaptopropyltrimethoxysilane, Polydimethyl Silicone, 2,4-hexafluorovinylmethylsiloxane, polyvinyl fluoride, or hydroxyapatite. 6. the preparation method of a kind of photocatalytic coating air self-purification functional fabric according to claim 1, is characterized in that: the photocatalyst of described step (4) is silver and iron composite doping modification, silver and aluminum Composite doping modification or composite doping modification of lanthanum and iron is a porous nanometer metal particle, and its pore diameter is 6-16nm. 7. The preparation method of a photocatalytic coated air self-purifying functional fabric according to claim 6, characterized in that: the nano-metal particles are selected from TiO ₂ , CdS, ZnS, WO ₃ , SnO ₂ , V ₂ O ₅ , BiVO ₄ or a mixture of the two, the particle size of the nanometer metal ion is 6-90nm. 8. the preparation method of a kind of photocatalytic coating air self-purification functional fabric according to claim 1, is characterized in that: the coating agent of described step (4) is silicone, solvent type polyacrylate, solvent, The mass ratio of the mixture of the catalyst and the dispersant is 4-6:8-10:10-16:3-5:2-4 in sequence. 9. the preparation method of a kind of photocatalytic coating air self-purification functional fabric according to claim 8, it is characterized in that: described dispersant is polysiloxane type surfactant and organosilicon modified polyvinyl alcohol surface The compound of the active agent has a mass ratio of 1:3 to 3:5. 10. The preparation method of a kind of photocatalytic coating air self-purification functional fabric according to claim 8, is characterized in that: described catalyst is ammonium nitrate, ammonium sulfate, ammonium phosphate, ammonium carbonate, ammonium dihydrogen phosphate or ammonium chloride. 11. A method for preparing a photocatalytic coated air self-purifying functional fabric according to claim 8, characterized in that: the solvent is a mixture of water and ether, and its mass ratio is 3:1 to 5:1 . 12. The preparation method of a photocatalytic coated air self-purifying functional fabric according to claim 1, characterized in that: the prepared air self-purifying functional fabric is applied to submarines, automobile interior decoration and interior decoration fields.