阅读说明：本技术 一种驱除螨虫的光催化剂及其制备方法 (Photocatalyst for expelling mites and preparation method thereof ) 是由 崔洪珊 何晓文 湛孝东 董海丽 姜坤 任晓燕 秦霞 于 2021-11-05 设计创作，主要内容包括：本发明公开了一种驱除螨虫的光催化剂制备方法,将四氯化碳、油酸钾混合均匀得到预混料；将纤维素黄原酸钠、致孔剂、三偏磷酸钠和水混合均匀,调节体系pH值为8-10,然后加入至预混料中,80-90℃继续搅拌10-20min,自然冷却至室温,过滤,洗涤滤饼,干燥得到负载基体；将酞酸丁酯加入至无水乙醇中,40-60℃搅拌1-2h,逐滴加入冰乙酸,调节体系pH值为4-5,继续搅拌,静置至凝胶状,烘干,研磨呈粉末,400-460℃焙烧20-30min,研磨均匀,加入腐殖酸研磨均匀,得到预处理粉体；向负载基体中加入植物提取液分散均匀,加入预处理粉体超声分散,干燥,粉碎得到驱除螨虫的光催化剂。(The invention discloses a preparation method of a photocatalyst for expelling mites, which comprises the steps of uniformly mixing carbon tetrachloride and potassium oleate to obtain a premix; uniformly mixing sodium cellulose xanthate, a pore-forming agent, sodium trimetaphosphate and water, adjusting the pH value of the system to 8-10, adding the mixture into a premix, continuously stirring the mixture for 10-20min at the temperature of 80-90 ℃, naturally cooling the mixture to room temperature, filtering the mixture, washing a filter cake, and drying the filter cake to obtain a load matrix; adding butyl phthalate into absolute ethyl alcohol, stirring for 1-2h at 40-60 ℃, dropwise adding glacial acetic acid, adjusting the pH value of the system to 4-5, continuously stirring, standing to be gelatinous, drying, grinding into powder, roasting at 460 ℃ for 20-30min at 400-; adding plant extract into the load matrix, uniformly dispersing, adding the pretreated powder, ultrasonically dispersing, drying and crushing to obtain the photocatalyst for expelling mites.)

1. The preparation method of the photocatalyst for expelling mites is characterized by comprising the following steps:

s1, uniformly mixing carbon tetrachloride and potassium oleate to obtain a premix; uniformly mixing sodium cellulose xanthate, a pore-foaming agent, sodium trimetaphosphate and water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring for 1-2h at the stirring speed of 1000-;

s2, adding butyl phthalate into absolute ethyl alcohol, stirring for 1-2 hours at 40-60 ℃, dropwise adding glacial acetic acid, continuously stirring for 10-20min, adjusting the pH value of the system to be 4-5, continuously stirring, standing to be gelatinous, drying, grinding into powder, roasting for 20-30min at 400-460 ℃, uniformly grinding, adding humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding the plant extracting solution into the load matrix, uniformly dispersing, adding the pretreatment powder, ultrasonically dispersing for 1-3h with the ultrasonic power of 400-500W, drying, and crushing to obtain the photocatalyst for expelling the mites.

2. The method for preparing a photocatalyst for repelling mites of claim 1, wherein in S1, the mass ratio of carbon tetrachloride, potassium oleate, sodium cellulose xanthate, pore-forming agent, and sodium trimetaphosphate is 40-50: 1-2: 8-10: 1-2: 0.1-1.

3. The method for preparing a photocatalyst for repelling mites of claim 1, wherein in S1, the filter cake is washed 2-4 times with 40-60% by mass of an aqueous solution of ethanol.

4. The method for preparing a photocatalyst for repelling mites of claim 1, wherein in S1, the pore-forming agent is polyethylene glycol 200.

5. The method for preparing a photocatalyst for repelling mites as claimed in claim 1, wherein in S2, the mass ratio of butyl phthalate, glacial acetic acid and humic acid is 2-6: 0.1-1: 1-2.

6. The method for preparing a photocatalyst for repelling mites as claimed in claim 1, wherein the drying temperature in S2 is 100-110 ℃.

7. The method for preparing a photocatalyst for repelling mites of claim 1, wherein in S3, the mass ratio of the loading substrate, the plant extract and the pretreatment powder is 12-15: 10-15: 4-8.

8. The method for preparing a photocatalyst for repelling mites as claimed in claim 1, wherein in S3, the plant extract is at least one of a stemona root extract, a sophora flavescens extract, a phellodendron extract, a soapberry extract, a licorice extract, a cnidium fruit extract, a wild chrysanthemum extract, a mint extract, a centella asiatica extract, and a green tea extract.

9. A photocatalyst for repelling mites, which is characterized by being prepared by the method for preparing a photocatalyst for repelling mites according to any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of mite expelling, and particularly relates to a photocatalyst for mite expelling and a preparation method thereof.

Background

The mites generally have the body size of 0.1-0.5 mm, are always like living in a dark environment, are various in food habits, are often found on human and livestock bodies, agricultural products containing starch, fibers, saccharides and the like, household textiles such as clothes and quilts and the like, and have living conditions closely linked with the life of people, so that the mites seriously affect the life of people and are pests aversive to people.

Mites like wet, high-temperature, cotton-linen fabric or dusty soil, and are generally classified into dust mites, flour mites, leather mites, and Qiang mites, which are widely distributed in dark corners of a room, carpets, mattresses, pillows, sofas, air conditioners, summer sleeping mats, etc., wherein the dust mites are distributed most widely and have the greatest influence

Mites are strong allergens and can cause systemic allergies, including allergic asthma, allergic rhinoconjunctivitis, atopic eczema/dermatitis, allergic urticaria, etc., with mite allergies accounting for approximately 80% of each disease species. It is estimated that 50-80% of asthma is caused by dust mites, which also cause many types of eczema, hay fever and other allergic diseases.

For a long time, in the aspect of preventing and controlling mites, people always adopt insecticide spraying, medicine smoke fumigation, camphor balls placed in a cabinet, and the like, and although the products and the methods have certain effects on preventing and controlling the mites, the common methods of spraying liquid medicine for poisoning and killing and fumigating for expelling are all temporary and permanent treatment, have a plurality of defects, have short effective period and are easy to cause environmental pollution.

With the continuous improvement of living standard of people, people pay more attention to living environment of self living, how to prepare a product which not only can inhibit mites and drive mites, but also can resist and inhibit bacteria becomes the technical problem to be solved at present.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a photocatalyst for expelling mites and a preparation method thereof.

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing carbon tetrachloride and potassium oleate to obtain a premix; uniformly mixing sodium cellulose xanthate, a pore-foaming agent, sodium trimetaphosphate and water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring for 1-2h at the stirring speed of 1000-;

s2, adding butyl phthalate into absolute ethyl alcohol, stirring for 1-2 hours at 40-60 ℃, dropwise adding glacial acetic acid, continuously stirring for 10-20min, adjusting the pH value of the system to be 4-5, continuously stirring, standing to be gelatinous, drying, grinding into powder, roasting for 20-30min at 400-460 ℃, uniformly grinding, adding humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding the plant extracting solution into the load matrix, uniformly dispersing, adding the pretreatment powder, ultrasonically dispersing for 1-3h with the ultrasonic power of 400-500W, drying, and crushing to obtain the photocatalyst for expelling the mites.

Preferably, in S1, the mass ratio of carbon tetrachloride, potassium oleate, sodium cellulose xanthate, pore-forming agent and sodium trimetaphosphate is 40-50: 1-2: 8-10: 1-2: 0.1-1.

Preferably, in S1, the filter cake is washed 2-4 times by using 40-60% ethanol water solution by mass fraction.

Preferably, in S1, the porogen is polyethylene glycol 200.

Preferably, in S2, the mass ratio of butyl phthalate, glacial acetic acid and humic acid is 2-6: 0.1-1: 1-2.

Preferably, in S2, the drying temperature is 100-110 ℃.

Preferably, in S3, the mass ratio of the load matrix, the plant extract, and the pre-treatment powder is 12-15: 10-15: 4-8.

Preferably, in S3, the plant extract is at least one of radix Stemonae extract, radix Sophorae Flavescentis extract, cortex Phellodendri extract, fructus Sapindi Mukouossi extract, Glycyrrhrizae radix extract, fructus Cnidii extract, flos Chrysanthemi Indici extract, herba Menthae extract, herba Centellae extract, and green tea extract.

A photocatalyst for expelling mites is prepared by the preparation method of the photocatalyst for expelling mites.

The technical effects of the invention are as follows:

(1) the invention adopts 400-460 ℃ calcination to promote the crystal form of the nano titanium dioxide to be changed from an amorphous state to an anatase type, and has good adsorbability, but if the temperature exceeds 500 ℃, the anatase is promoted to be changed to a rutile crystal form, so that the adsorbability is reduced sharply.

(2) According to the invention, sodium trimetaphosphate is adopted to react with sodium cellulose xanthate in S1, cross-linked spherical particles containing a pore-forming agent are formed in carbon tetrachloride, and then the pore-forming agent is removed by washing, so that the spherical particles have extremely large specific surface area, excellent wettability in plant extract and extremely high dispersion uniformity; the nanometer titanium dioxide is combined with the pretreated powder after being dried, but if the nanometer titanium dioxide is directly adsorbed and loaded on the surface of the nanometer titanium dioxide, certain degree of agglomeration can occur, so the nanometer titanium dioxide is firstly combined with humic acid, the humic acid contains carboxyl, hydroxyl, phenol group and other groups, the humic acid is adsorbed on the surface of the nanometer titanium dioxide and then is combined with a loading matrix, the problem that the nanometer titanium dioxide is easy to agglomerate can be solved, and because the surface of the nanometer titanium dioxide contains more polar functional groups such as carboxyl, carbonyl and the like, the nanometer titanium dioxide is tightly combined with the loading matrix through stronger interaction, the migration of the nanometer titanium dioxide is effectively reduced, and the stability of a product is excellent.

(3) The invention has high adsorptivity and high photocatalysis performance, a layer of organic plant extract component is arranged between the photocatalysis carrier and the photocatalyst, the organism bonding strength is extremely high, the prepared product has obviously improved mite-expelling effect, stability and slow release performance, not only can effectively inhibit the growth and reproduction of mites and even kill the mites, but also ensures the slow release performance of the organism, the mite-expelling effect is sustained, and the problem of the drug preparation for preventing and controlling the mites in the prior art is solved.

Meanwhile, experiments show that the nano titanium dioxide serving as a photocatalyst material is matched with an organic plant extraction component, so that various bacteria can be effectively killed, the antibacterial rate reaches over 99 percent, a good synergistic effect on mite removal is achieved, the mite removal rate and the pest expelling time are obviously prolonged, and the mite removing stability is extremely high.

Drawings

FIG. 1 is a graph showing the comparison of the continuous mite evasion rates of the photocatalyst for exterminating mites obtained in example 5 and comparative examples 1 to 3.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.

Example 1

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 40kg of carbon tetrachloride and 2kg of potassium oleate to obtain a premix; uniformly mixing 8kg of cellulose xanthate, 2kg of polyethylene glycol 200, 0.1kg of sodium trimetaphosphate and 20kg of water, adjusting the pH value of the system to be 8-10, adding the mixture into a premix, stirring at a high speed of 2000r/min for 1h, reducing the stirring speed to 100r/min, continuing stirring at 90 ℃ for 10min, naturally cooling to room temperature, filtering, washing a filter cake for 2 times by adopting an ethanol water solution with the mass fraction of 60%, and drying to obtain a load matrix;

s2, adding 6kg of butyl phthalate into 30kg of absolute ethyl alcohol, stirring for 1h at 60 ℃, dropwise adding 1kg of glacial acetic acid, continuously stirring for 10min, adjusting the pH value of the system to be 4-5, continuously stirring for 30min, standing to be in a gel state, drying at 100 ℃, grinding into powder, roasting at 460 ℃ for 20min, uniformly grinding, adding 2kg of humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding 15kg of radix stemonae extracting solution into 12kg of load matrix, uniformly dispersing, adding 4kg of pretreatment powder, ultrasonically dispersing for 3 hours with the ultrasonic power of 400W, drying, and crushing to obtain the photocatalyst for removing the mites.

Example 2

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 50kg of carbon tetrachloride and 1kg of potassium oleate to obtain a premix; uniformly mixing 10kg of cellulose xanthate, 1kg of polyethylene glycol 200, 1kg of sodium trimetaphosphate and 15kg of water, adjusting the pH value of the system to be 8-10, adding the mixture into a premix, stirring at a high speed of 1000r/min for 2h, reducing the stirring speed to 400r/min, continuing stirring at 80 ℃ for 20min, naturally cooling to room temperature, filtering, washing a filter cake for 4 times by adopting an ethanol water solution with the mass fraction of 40%, and drying to obtain a load matrix;

s2, adding 2kg of butyl phthalate into 60kg of absolute ethyl alcohol, stirring for 2 hours at 40 ℃, dropwise adding 0.1kg of glacial acetic acid, continuously stirring for 20 minutes, adjusting the pH value of the system to be 4-5, continuously stirring for 10 minutes, standing to be gelatinous, drying at 110 ℃, grinding into powder, roasting at 400 ℃ for 30 minutes, uniformly grinding, adding 1kg of humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding 10kg of centella extract into 15kg of load matrix, uniformly dispersing, adding 8kg of pretreatment powder, ultrasonically dispersing for 1h with the ultrasonic power of 500W, drying, and crushing to obtain the photocatalyst for expelling mites.

Example 3

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 42kg of carbon tetrachloride and 1.7kg of potassium oleate to obtain a premix; uniformly mixing 8.5kg of cellulose xanthate, 1.7kg of polyethylene glycol 200, 0.3kg of sodium trimetaphosphate and 18kg of water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring at a high speed of 1800r/min for 1.3h, reducing the stirring speed to 200r/min, continuing stirring at 88 ℃ for 13min, naturally cooling to room temperature, filtering, washing a filter cake for 3 times by adopting an ethanol water solution with the mass fraction of 55%, and drying to obtain a load matrix;

s2, adding 3kg of butyl phthalate into 50kg of absolute ethyl alcohol, stirring for 1.7h at 45 ℃, dropwise adding 0.3kg of glacial acetic acid, continuously stirring for 17min, adjusting the pH value of the system to be 4-5, continuously stirring for 15min, standing to be gelatinous, drying at 108 ℃, grinding into powder, roasting at 420 ℃ for 28min, uniformly grinding, adding 1.3kg of humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding 10kg of wild chrysanthemum flower extract and 2kg of mint extract into 14kg of load matrix, uniformly dispersing, adding 7kg of pretreatment powder, ultrasonically dispersing for 1.5h with the ultrasonic power of 480W, drying, and crushing to obtain the photocatalyst for expelling mites.

Example 4

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 48kg of carbon tetrachloride and 1.3kg of potassium oleate to obtain a premix; uniformly mixing 9.5kg of cellulose xanthate, 1.3kg of polyethylene glycol 200, 0.7kg of sodium trimetaphosphate and 16kg of water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring at a high speed of 1200r/min for 1.7h, reducing the stirring speed to 300r/min, continuing stirring at 82 ℃ for 17min, naturally cooling to room temperature, filtering, washing a filter cake for 3 times by adopting an ethanol water solution with a mass fraction of 45%, and drying to obtain a load matrix;

s2, adding 5kg of butyl phthalate into 40kg of absolute ethyl alcohol, stirring for 1.3h at 55 ℃, dropwise adding 0.7kg of glacial acetic acid, continuously stirring for 13min, adjusting the pH value of the system to be 4-5, continuously stirring for 25min, standing to be gelatinous, drying at 102 ℃, grinding into powder, roasting at 440 ℃ for 22min, uniformly grinding, adding 1.7kg of humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding 1kg of liquorice extract and 13kg of fructus cnidii extract into 13kg of load substrate, uniformly dispersing, adding 5kg of pretreatment powder, ultrasonically dispersing for 2.5h with the ultrasonic power of 420W, drying, and crushing to obtain the photocatalyst for expelling mites.

Example 5

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 45kg of carbon tetrachloride and 1.5kg of potassium oleate to obtain a premix; uniformly mixing 9kg of cellulose xanthate, 1.5kg of polyethylene glycol 200, 0.5kg of sodium trimetaphosphate and 17kg of water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring at a high speed of 1500r/min for 1.5h, reducing the stirring speed to 280r/min, continuing stirring at 85 ℃ for 15min, naturally cooling to room temperature, filtering, washing a filter cake for 3 times by adopting an ethanol water solution with the mass fraction of 50%, and drying to obtain a load matrix;

s2, adding 4kg of butyl phthalate into 45kg of absolute ethyl alcohol, stirring for 1.5h at 50 ℃, dropwise adding 0.5kg of glacial acetic acid, continuously stirring for 15min, adjusting the pH value of the system to be 4-5, continuously stirring for 20min, standing to be gelatinous, drying at 105 ℃, grinding into powder, roasting at 430 ℃ for 25min, uniformly grinding, adding 1.5kg of humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding 6kg of radix sophorae flavescentis extract and 7kg of cortex phellodendri extract into 13.5kg of load matrix, uniformly dispersing, adding 6kg of pretreatment powder, ultrasonically dispersing for 2 hours at the ultrasonic power of 450W, drying, and crushing to obtain the photocatalyst for removing mites.

Comparative example 1

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 45kg of carbon tetrachloride and 1.5kg of potassium oleate to obtain a premix; uniformly mixing 9kg of cellulose xanthate, 1.5kg of polyethylene glycol 200, 0.5kg of sodium trimetaphosphate and 17kg of water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring at a high speed of 1500r/min for 1.5h, reducing the stirring speed to 280r/min, continuing stirring at 85 ℃ for 15min, naturally cooling to room temperature, filtering, washing a filter cake for 3 times by adopting an ethanol water solution with the mass fraction of 50%, and drying to obtain a load matrix;

s2, adding 6kg of radix sophorae flavescentis extract and 7kg of cortex phellodendri extract into 13.5kg of load matrix, uniformly dispersing, drying and crushing to obtain the photocatalyst for expelling mites.

Comparative example 2

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 45kg of carbon tetrachloride and 1.5kg of potassium oleate to obtain a premix; uniformly mixing 9kg of cellulose xanthate, 1.5kg of polyethylene glycol 200, 0.5kg of sodium trimetaphosphate and 17kg of water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring at a high speed of 1500r/min for 1.5h, reducing the stirring speed to 280r/min, continuing stirring at 85 ℃ for 15min, naturally cooling to room temperature, filtering, washing a filter cake for 3 times by adopting an ethanol water solution with the mass fraction of 50%, and drying to obtain a load matrix;

s2, adding 4kg of butyl phthalate into 45kg of absolute ethyl alcohol, stirring for 1.5h at 50 ℃, dropwise adding 0.5kg of glacial acetic acid, continuously stirring for 15min, adjusting the pH value of the system to be 4-5, continuously stirring for 20min, standing to be gelatinous, drying at 105 ℃, grinding into powder, roasting at 430 ℃ for 25min, and uniformly grinding to obtain pretreated powder;

s3, adding 6kg of radix sophorae flavescentis extract and 7kg of cortex phellodendri extract into 13.5kg of load matrix, uniformly dispersing, adding 6kg of pretreatment powder, ultrasonically dispersing for 2 hours at the ultrasonic power of 450W, drying, and crushing to obtain the photocatalyst for removing mites.

Comparative example 3

A preparation method of a photocatalyst for expelling mites comprises the following steps:

s1, uniformly mixing 45kg of carbon tetrachloride and 1.5kg of potassium oleate to obtain a premix; uniformly mixing 9kg of cellulose xanthate, 1.5kg of polyethylene glycol 200, 0.5kg of sodium trimetaphosphate and 17kg of water, adjusting the pH value of the system to be 8-10, then adding the mixture into a premix, stirring at a high speed of 1500r/min for 1.5h, reducing the stirring speed to 280r/min, continuing stirring at 85 ℃ for 15min, naturally cooling to room temperature, filtering, washing a filter cake for 3 times by adopting an ethanol water solution with the mass fraction of 50%, and drying to obtain a load matrix;

s2, adding 4kg of butyl phthalate into 45kg of absolute ethyl alcohol, stirring for 1.5h at 50 ℃, dropwise adding 0.5kg of glacial acetic acid, continuously stirring for 15min, adjusting the pH value of the system to be 4-5, continuously stirring for 20min, standing to be gelatinous, drying at 105 ℃, grinding into powder, roasting at 430 ℃ for 25min, uniformly grinding, adding 1.5kg of humic acid, and uniformly grinding to obtain pretreated powder;

s3, adding 6kg of pretreatment powder into 13.5kg of load matrix, carrying out ultrasonic dispersion for 2h with the ultrasonic power of 450W, drying, and crushing to obtain the photocatalyst for expelling mites.

The photocatalyst for repelling mites obtained in example 5 and comparative examples 1 to 3 was tested as follows:

test example 1 stability of each group of samples was examined:

100g of each group of samples are respectively placed in a constant temperature box with the temperature of 40 +/-2 ℃ for heat preservation for 24h, are naturally cooled to room temperature, and the appearance of the samples is observed, wherein the mite removing photocatalyst obtained in the example 5 and the comparative example 3 has no phenomena of turbidity, precipitation and delamination, but the mite removing photocatalyst obtained in the comparative example 1 is slightly turbid, and the mite removing photocatalyst obtained in the comparative example 2 has phenomena of turbidity and delamination. The odor of each sample was simultaneously smelled, and no off-flavor was observed in each group of samples.

And (3) respectively placing 100g of each group of samples in a thermostat with the temperature of minus 5 +/-2 ℃ for heat preservation for 24h, naturally cooling to room temperature, and observing the appearance of the samples. Similarly, the mite-repelling photocatalyst obtained in example 5 and comparative examples 1 and 3 did not show any turbidity, precipitation, or delamination, but the mite-repelling photocatalyst obtained in comparative example 2 showed precipitation or delamination.

The above tests confirm that: the photocatalyst for repelling mites obtained in example 5 and comparative example 3 has good stability in high and low temperature environments. The applicant speculates that the photocatalyst for expelling mites obtained in comparative example 2 is insufficient in stability because the nano titanium dioxide is directly adsorbed and loaded on the surface of the loading substrate, so that the nano titanium dioxide is agglomerated.

The invention adopts the combination of the nano titanium dioxide and humic acid with carboxyl, hydroxyl, phenolic group and other groups on the surface, so that the humic acid is adsorbed on the surface of the nano titanium dioxide and then is combined with the load matrix, thereby not only solving the problem that the nano titanium dioxide is easy to agglomerate, but also realizing the tight combination with the load matrix through stronger interaction because the surface of the nano titanium dioxide contains more polar functional groups such as carboxyl, carbonyl and the like, effectively reducing the migration of the nano titanium dioxide and having excellent product stability.

Test example 2 the mite-repelling effect of each group of samples was detected:

a plurality of cellulose plates with the length of 110mm, the width of 110mm and the thickness of 1mm are manufactured, all groups of samples are uniformly coated on the surfaces of the cellulose plates, and the anti-mite performance is tested according to FZ/T01100-.

The results are shown in fig. 1, and it can be seen from fig. 1 that both the mite-repelling rate and the mite-repelling persistence of example 5 are superior to those of the comparative example.

The applicant believes that:

1. the comparative example 1 only adopts the combination of the load matrix and the plant extract, while the comparative example 3 adopts the combination of the load matrix and the pretreatment powder, the former lacks of the photocatalyst, and the latter lacks of the plant extract, which are difficult to effectively repel the mites.

2. The comparative example 2 and the example 5 both adopt the combination of the loading matrix, the plant extract and the pretreatment powder, so that the mite avoidance rate of the comparative example 2 group is close to that of the example 5 at the beginning, but the stability of the comparative example 2 is insufficient, and the mite avoidance rate of the comparative example 2 group is lower and lower along with the prolonging of the exposure time, which is obviously inferior to that of the example 5.

Test example 3 the bacteriostatic effect of each group of samples was tested:

the antibacterial effect of each group of samples is detected by referring to an antibacterial effect test method (antibacterial ring method) of 7.5 antibacterial type daily chemical products in an evaluation method of antibacterial and antibacterial effects of QB/T2738-. The samples of each group are continuously dissolved and are diffused by agar to form different concentration gradients so as to display the bacteriostatic action of the samples, and then whether the samples have bacteriostatic ability or not is judged according to the size of a bacteriostatic ring (whether the size is larger than 7 mm).

The test conditions were as follows: the temperature is 20 + -1 deg.C, and Staphylococcus aureus (ATCC6538), Escherichia coli (8099), and Candida albicans (ATCC 10231) are used as test strains.

Diameter of bacteriostatic ring, mm	Staphylococcus aureus	Escherichia coli	Candida albicans
				Example 5	7.35	7.25	7.10
Comparative example 1	7.00	6.75	6.55
				Comparative example 2	7.30	7.25	7.15
Comparative example 3	6.45	5.95	5.60

From the above table, it can be seen that: the photocatalyst for repelling mites obtained in example 5 and comparative example 2 has bacteriostatic ability.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.