CN1538002A - Fabric containing photocatalytic bactericide and preparation method thereof - Google Patents

Abstract

The invention belongs to the field of functional fabrics and antibacterial materials, in particular to fabrics containing photocatalytic bactericides and a preparation method thereof. (1) preparing the photocatalyst into a solution; (2) coating the solution of step (1) on the fabric; (3) drying the fabric containing the photocatalyst at a temperature of 30-90° C. for 1-5 hours to obtain The fabric containing photocatalytic bactericide, wherein the photocatalyst contained in the fabric is 4-15g/m ² . The fabric has the functions of antibacterial, disease prevention, health care and environment purification under the irradiation of light. It can be widely used in medical supplies, bedding, curtains, clothing and daily necessities, etc.

Description

Fabric containing photocatalytic bactericide and preparation method thereof

Technical field

The invention belongs to the field of functional fabrics and antibacterial materials, in particular to fabrics containing photocatalytic bactericides and a preparation method thereof.

Background technique

Environmental pollution and sustainable development are the topics of concern to all countries. Environmental deterioration and the destruction of ecological balance have become serious threats to human society. The pollution of air and water, the proliferation of germs or other bacteria pose a threat to people's health. Because the semiconductor TiO ₂ can generate hole-electron pairs under the irradiation of light, the holes have strong oxidation ability, and under a certain humidity and an oxygen atmosphere, they can generate highly active superoxide anion radicals and hydrogen-oxygen free radicals. These free radicals can almost completely degrade most organic matter to H ₂ O and CO ₂ , while electrons have the ability to reduce heavy metal ions to simple substances. Based on this, the TiO ₂ photocatalyst has the function of killing bacteria. When encountering bacteria, it directly attacks the cells of the bacteria, causing the organic matter in the bacteria cells to degrade, thereby killing the bacteria and decomposing them.

Among the many antibacterial agents, inorganic nano- _TiO2 stands out with excellent performance, and can be widely used in many aspects such as hygiene daily necessities, cosmetics, antibacterial daily necessities and medical supplies. The nano-TiO ₂ photocatalytic bactericide has the following two obvious advantages: the first advantage is high and long-lasting antibacterial efficiency. Although commonly used fungicides such as silver and copper can inactivate bacterial cells, after the bacteria are killed, the corpse releases harmful components such as endotoxin. Nano- _TiO2 can not only inhibit bacterial reproduction, but also destroy the cell membrane structure of bacteria, so as to completely degrade bacteria, thereby preventing secondary pollution caused by endotoxins. ₂ It only takes about 1 hour to kill bacteria. The antibacterial mechanism of nano-TiO ₂ is different from general inorganic and organic antibacterial agents. It does not rely on the exudation and dissociation of drugs to produce antibacterial effects. Its sterilization mechanism lies in photocatalysis. Nano-TiO ₂ is a non-elution type material. While degrading organic pollutants and killing bacteria, it does not decompose or dissolve itself. It has a long-lasting photocatalytic effect and has a long-lasting effect of sterilizing and degrading pollutants. Unlike other antibacterial agents that will As the antibacterial agent dissolves, the antibacterial effect gradually decreases. The second advantage is that nano-TiO ₂ has good safety. It is an odorless, non-toxic material that can be used in food additives and cosmetics. It has no irritation and adverse reactions in contact with the skin, and its final degradation products have no toxic and side effects. It can catalyze and decompose germs and pollutants by using natural light, normal temperature and pressure, and is resistant to temperature and corrosion, and has a wide range of applications.

Studies have shown that TiO ₂ photocatalytic bactericide has a high bactericidal rate on Staphylococcus aureus, Escherichia coli, and Bacillus subtilis. Lambert-negative bacteria, Bacillus subtilis are cell embryos and have strong viability, but nano-TiO ₂ has obvious bactericidal effect on them. The results of experiments done by scientists with white mice show that directly injecting TiO ₂ photocatalyst into skin cancer and other lesions, the cancer cells will be killed under ultraviolet irradiation. The use of TiO2 photocatalyst to prevent tooth decay has also achieved curative effect, because titanium dioxide kills Streptococcus mutans, making it unable to decompose sugar internally, and then produces acid to dissolve calcium and phosphorus on teeth. Nano-TiO ₂ is also very good for different molds (such as Aspergillus flavus, Aspergillus niger, Aspergillus sayi, Aspergillus terreus, Aspergillus pylorus, Chaetomium globosa, Cladospora, Penicillium citrinum, Paecilomyces, Trichoderma viride) bactericidal effect.

Nano TiO ₂ photocatalyst has more obvious advantages than some other inorganic fungicides and organic fungicides. The fabric has long-term antibacterial, disease prevention, health care and environmental purification effects under the irradiation of light. It can be widely used in medical supplies, bedding, curtains, clothing and daily necessities, etc.

Contents of Invention

One of the objectives of the present invention is to provide fabrics containing photocatalytic bactericides to solve the current situation that textiles have no or unsatisfactory bactericidal functions.

Another object of the present invention is to provide a method for preparing a fabric containing a photocatalytic bactericide.

The photocatalyst contained in the fabric containing the photocatalytic bactericide of the present invention is 4-15g/m ² .

The preparation method of the fabric containing photocatalytic bactericide of the present invention, this method comprises the following steps:

(1) the photocatalyst is prepared into a solution;

(2) coating the solution of step (1) on the fabric;

(3) Drying the fabric containing the photocatalyst.

The fabrics include cotton, silk, linen, wool or cashmere products or chemical fiber products.

The photocatalyst includes titanium oxide photocatalyst, titanium oxide catalyst doped with iron ions, titanium oxide and zinc oxide composite catalyst, wherein the weight ratio of titanium oxide: zinc oxide is 1.5～2.5:1, titanium oxide and silicon oxide Composite catalyst, wherein the weight ratio of titanium oxide: silicon oxide is 1-2:1. The state of the catalyst can be powder or slurry.

In order to combine the photocatalyst with the surface of the fabric firmly, the photocatalyst can be formulated into a photocatalyst solution by using titanium sol and/or silica sol to coat the fabric, wherein the solution contains 0.5-15 wt% of photocatalyst.

The coating includes spraying or dipping the photocatalyst on the surface of the fabric at room temperature, and the photocatalyst contained in the fabric containing the photocatalytic bactericide is 4-15g/m ² .

The fabric containing the photocatalyst can be obtained by drying the fabric containing the photocatalyst at a temperature of 30-90° C. for 1-5 hours.

The fabric of the invention can maintain the original breathable effect of the fabric after being coated with the photocatalyst. The fabric has the functions of antibacterial, disease prevention, health care and environment purification. It can be widely used in medical supplies, bedding, curtains, clothing and daily necessities, etc.

Detailed ways

The present invention will be further described below in conjunction with examples, and the examples listed are not limiting examples.

Example 1

Take 10g of nano- _TiO2 photocatalyst powder, disperse it evenly in 100g of silica sol, apply it on white gauze by spraying in an amount of 120mL/ ^m2 , and dry it at 80°C for 1h to obtain a gauze containing a photocatalyst layer , wherein the photocatalyst contained in the gauze is 4-15g/m ² . Then move the pre-cultured Escherichia coli to the blank sample and the gauze containing the photocatalyst layer, count the number of colonies, and obtain the number of bacteria killed in 1 hour of contact time (see Table 1).

The test of table 1 white gauze anti-escherichia coli performance Contact time (min) Escherichia coli content (cfu/ml) Sterilization rate (%) 0 1.2×10 ⁵ 0 10 32500 72.92 30 14600 87.83 60 900 99.25

Example 2

Take 10g of nano- _TiO2 photocatalyst powder, disperse it evenly in 100g of silica sol, apply it on white gauze by spraying in an amount of 120mL/ ^m2 , and dry it at 30°C for 5h to obtain a gauze containing a photocatalyst layer , wherein the photocatalyst contained in the gauze is 4-15g/m ² . Then move the Escherichia coli, Staphylococcus aureus and Candida albicans cultivated in advance to the blank sample and the gauze containing the photocatalyst layer, count the number of colonies, and obtain the number of bacteria killed in 1 h of contact time (see Table 2).

The test of table 2 white gauze antibacterial property bacteria Escherichia coli Staphylococcus aureus Candida albicans Bacteria content on the contact time "0" sample (cfu/ml) 1.2×10 ⁵ 1.2×10 ⁵ 1.2×10 ⁵ Bacteria content (cfu/ml) on the sample with contact time "1 hour" 900 1000 1200 Sterilization rate (%) 99.25 99.17 99.00

Example 3

Take 10g of nano- _TiO2 photocatalyst powder, disperse it evenly in 100g of silica sol, apply it on a white polypropylene fiber cloth by spraying in an amount of 120mL/ ^m2 , and dry it at 30°C for 5h to obtain a photocatalyst-containing layer Polypropylene fiber cloth, wherein the photocatalyst contained in the polypropylene fiber cloth is 4-15g/m ² . Then move Escherichia coli, Staphylococcus aureus and Candida albicans cultivated in advance to the blank sample and the polypropylene fiber cloth containing the photocatalyst layer, count the number of colonies, and obtain the number of bacteria killed in 1 hour of contact time (see Table 3).

Table 3 Test of antibacterial properties of white polypropylene fiber cloth bacteria Escherichia coli Staphylococcus aureus Candida albicans Bacteria content on the contact time "0" sample (cfu/ml) 1.2×10 ⁵ 1.2×10 ⁵ 1.2×10 ⁵ Bacteria content (cfu/ml) on the sample with contact time "1 hour" 1000 1100 1300 Sterilization rate (%) 99.17 99.08 98.92

Example 4

Get 5g of titanium oxide and silicon oxide composite catalyst powder, wherein the weight ratio of titanium oxide: silicon oxide is 1: 1, uniformly dispersed in 100g titanium sol, with 60mL/m ^Amount and use the method of spraying to coat on white gauze drying at a temperature of 80° C. for 1 h to obtain a gauze containing a photocatalyst layer, wherein the photocatalyst contained in the gauze is 4˜15 g/m ² . Then move the Escherichia coli, Staphylococcus aureus and Candida albicans cultivated in advance to the blank sample and the gauze containing the photocatalyst layer, count the number of colonies, and obtain the number of bacteria killed in 1 hour of contact time (see Table 4).

The test of table 4 gauze antibacterial properties bacteria Escherichia coli Staphylococcus aureus Candida albicans Bacteria content on the contact time "0" sample (cfu/ml) 1.2×10 ⁵ 1.2×10 ⁵ 1.2×10 ⁵ Bacteria content (cfu/ml) on the sample with contact time "1 hour" 1400 1600 1900 Sterilization rate (%) 98.83 98.67 98.42

Example 5

Take 5g of titanium oxide and silicon oxide composite catalyst powder, wherein the weight ratio of titanium oxide: silicon oxide is 1: ¹ , uniformly disperse in 100g titanium sol, and use the method of dip coating to coat on the white On the gauze, dry at a temperature of 90° C. for 4 hours to obtain a gauze containing a photocatalyst layer, wherein the photocatalyst contained in the gauze is 4˜15 g/m ² . Then move the Escherichia coli, Staphylococcus aureus and Candida albicans cultivated in advance to the blank sample and the gauze containing the photocatalyst layer, count the number of colonies, and obtain the number of bacteria killed in 1 h of contact time (see Table 5).

The test of table 5 gauze antibacterial properties bacteria Escherichia coli Staphylococcus aureus Candida albicans Bacteria content on the contact time "0" sample (cfu/ml) 1.2×10 ⁵ 1.2×10 ⁵ 1.2×10 ⁵ Bacteria content (cfu/ml) on the sample with contact time "1 hour" 700 800 1000 Sterilization rate (%) 99.42 99.33 99.00

Claims (10)

1. A fabric containing a photocatalytic fungicide, characterized in that: said fabric contains a photocatalyst of 4-15g/m ² . 2. The fabric according to claim 1, characterized in that: said photocatalyst comprises titanium oxide photocatalyst, titanium oxide catalyst doped with iron ions, titanium oxide and zinc oxide composite catalyst or titanium oxide and silicon oxide composite catalyst. 3. The fabric according to claim 2, characterized in that: the weight ratio of titanium oxide: zinc oxide in the titanium oxide and zinc oxide composite catalyst is 1.5-2.5:1. 4. The fabric according to claim 2, characterized in that: the weight ratio of titanium oxide: silicon oxide in the titanium oxide and silicon oxide composite catalyst is 1-2:1. 5. A method for preparing the fabric according to any one of claims 1 to 4, characterized in that: the method comprises the following steps: (1) the photocatalyst is prepared into a solution; (2) coating the solution of step (1) on the fabric; (3) drying the fabric containing the photocatalyst to obtain a fabric containing a photocatalyst bactericide, wherein the fabric contains a photocatalyst of 4 to 15 g/m ² ; The photocatalyst includes titanium oxide photocatalyst, titanium oxide catalyst doped with iron ions, composite catalyst of titanium oxide and zinc oxide or composite catalyst of titanium oxide and silicon oxide. 6. The method according to claim 5, characterized in that: the weight ratio of titanium oxide: zinc oxide in the titanium oxide and zinc oxide composite catalyst is 1.5˜2.5:1. 7. The method according to claim 5, characterized in that: the weight ratio of titanium oxide: silicon oxide in the titanium oxide and silicon oxide composite catalyst is 1-2:1. 8. The method according to claim 5, characterized in that: said photocatalyst is formulated into a solution using titanium sol and/or silica sol to prepare said photocatalyst into a photocatalyst solution, wherein the solution contains photocatalyst Catalyst 0.5-15wt%. 9. The method according to claim 5, characterized in that: said coating comprises spraying or dipping the photocatalyst on the surface of the fabric. 10. The method according to claim 5, characterized in that: said drying is drying the fabric containing the photocatalyst at a temperature of 30-90°C.