Photocatalyst-based antibacterial modified cotton fiber and preparation method thereof

Abstract

The invention relates to a photocatalyst-based antibacterial modified cotton fiber and a preparation method thereof.The preparation method of the photocatalyst-based antibacterial modified cotton fiber comprises the following steps that S1, bismuth vanadate powder and sodium dodecyl benzene sulfonate are added into water and stirred, and a mixed solution is obtained; s2, adding starch octenyl succinate into water, and gelatinizing under a stirring condition to obtain gelatinized liquid; s3, mixing the gelatinized liquid and the mixed liquid, homogenizing, and spray-drying to obtain microcapsules; s4, adding microcapsules into ethanol, and adding azobisisoheptonitrile under a stirring condition, so as to obtain a modified solution; s5, cotton fibers are put into water in advance to be swelled and then put into the modification liquid, a reaction is carried out under the protective gas atmosphere, washing and drying are carried out, and the antibacterial modified cotton fibers based on the photocatalyst are prepared. The bismuth vanadate powder with photocatalytic activity is introduced into the cotton fiber in a chemical bonding manner, so that the cotton fiber is endowed with a lasting photodynamic antibacterial effect.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to an antibacterial modified cotton fiber based on photocatalysis and its preparation method. Background Technology

[0002] Cotton fiber is a natural seed fiber developed from the epidermal cells of fertilized ovules. Its main component is cellulose, and its cross-section comprises three levels: macromolecular structure, supramolecular structure, and morphological structure. In terms of morphological structure, cotton fiber has a multi-layered, lumen-like cross-section with natural twists, giving it excellent cohesion and spinnability. Cotton fiber is primarily composed of cellulose. In terms of macromolecular structure, cellulose macromolecules are composed of n glucose units linked by β-glycosidic bonds. In terms of supramolecular structure, cellulose has a regular structure, and the three hydroxyl groups on the glucose units readily form hydrogen bonds, giving cotton fiber high orientation and high crystallinity. In terms of physical properties, cotton fiber has high breaking strength, high modulus, good moisture absorption and breathability, a soft and supple feel, is comfortable against the skin, easy to dye, alkali-resistant, antistatic, has excellent spinnability, and is highly durable. Cotton fiber is widely used in clothing, home textiles, toys (e.g., as filling material), and other fields.

[0003] However, cotton fibers are highly absorbent, and if the fabric is kept damp for a long time, it is easy for bacteria and other microorganisms to grow.

[0004] In related technologies, photocatalytic materials are co-spun with fibers to create blended fibers, thereby imparting antibacterial properties to the fibers. However, the antibacterial effect of fibers made in this way is not durable, and the photocatalytic materials are easily lost after washing, resulting in a sharp decline in the antibacterial effect. Summary of the Invention

[0005] In view of this, the present invention provides a photocatalyst-based antibacterial modified cotton fiber and its preparation method to solve the above problems.

[0006] To achieve the above solution, the technical solution of the present invention is as follows: This application provides a method for preparing antibacterial modified cotton fiber based on photocatalysis, comprising the following steps: S1. Add bismuth vanadate powder and sodium dodecylbenzene sulfonate to water, stir, and obtain a mixture; S2. Add octenyl succinic acid starch ester to water and gelatinize under stirring to obtain a gelatinized liquid; S3. Mix the gelatinized liquid and the mixture, homogenize, and spray dry to obtain microcapsules; S4. Add microcapsules to ethanol, and add azobisisobutyronitrile under stirring to obtain the modified solution; S5. Cotton fibers are pre-soaked in water to swell, then placed in a modification solution and reacted under a protective gas atmosphere. After washing and drying, antibacterial modified cotton fibers based on photocatalysis are obtained.

[0007] In one embodiment of this application, in step S1, the mass ratio of sodium dodecylbenzenesulfonate to water is 0.05-0.12:100, preferably 0.06-0.12:100.

[0008] In one embodiment of this application, in step S1, the mass ratio of the bismuth vanadate powder to water is 0.08-0.15:100, preferably 0.09-0.15:100.

[0009] In one embodiment of this application, in step S1, after modifying the bismuth vanadate powder, the obtained modified bismuth vanadate is added to water. The modification includes: dispersing the bismuth vanadate powder in water under ultrasonic conditions, stirring, adding water-soluble silver salt and monohydrogen phosphate in sequence, adjusting the pH to 6-8, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate.

[0010] In one embodiment of this application, in step S1, the molar ratio of the water-soluble silver salt to the monohydrogen phosphate is 2-3:1, preferably 2.5-3:1.

[0011] In one embodiment of this application, in step S1, the molar ratio of the water-soluble silver salt to the bismuth vanadate powder is 2-3:1, preferably 2.5-3:1.

[0012] In one embodiment of this application, in step S2, the mass ratio of the octenyl succinate starch ester to water is 0.3-0.5:100, preferably 0.4-0.5:100.

[0013] In one embodiment of this application, in step S2, the stirring speed is 140-160 r / min, preferably 145-160 r / min.

[0014] In one embodiment of this application, in step S2, the gelatinization temperature is 90-98°C, preferably 92-98°C; the gelatinization time is 25-35 min, preferably 28-35 min.

[0015] In one embodiment of this application, in step S3, the mass ratio of bismuth vanadate powder to octenyl succinate starch ester is 1:2-5, preferably 1:3-5.

[0016] In one embodiment of this application, in step S3, during the homogenization process, the rotation speed is 7500-8000 r / min, preferably 7800-8000 r / min; the homogenization time is 5-10 min, preferably 8-10 min.

[0017] In one embodiment of this application, in step S3, during the spray drying process, the inlet air temperature is 175-185℃, preferably 178-185℃; and the outlet air temperature is 95-105℃, preferably 98-105℃.

[0018] In one embodiment of this application, in step S4, the mass ratio of the microcapsule to ethanol is 4-6:100, preferably 5-6:100.

[0019] In one embodiment of this application, in step S4, the mass ratio of the azobisisobutyronitrile to the microcapsules is 1:4-6, preferably 1:5-6.

[0020] In one embodiment of this application, in step S5, the mass ratio of cotton fiber to water is 1:10-20, preferably 1:15-20.

[0021] In one embodiment of this application, in step S5, the mass ratio of the cotton fiber to the modified liquid is 1:10-20, preferably 1:15-20.

[0022] In one embodiment of this application, in step S5, the reaction temperature is 50-60°C, preferably 55-60°C; the reaction duration is 1-3 hours, preferably 1.5-3 hours.

[0023] In one embodiment of this application, in step S5, the drying temperature is 50-60°C, preferably 55-60°C.

[0024] This application also provides a photocatalytically modified antibacterial cotton fiber prepared according to the method described above.

[0025] The beneficial effects of this application are: In this application, bismuth vanadate powder is used as the core material, sodium dodecylbenzenesulfonate is used as the emulsifier, and octenyl succinate starch ester is used as the wall material to prepare microcapsules. Azobisisobutyronitrile decomposes upon heating to generate free radicals. Under the initiation of free radicals, octenyl succinate starch ester, which serves as the wall material of the microcapsules, undergoes a grafting reaction with cotton fibers. That is, this application introduces photocatalytically active bismuth vanadate powder into cotton fibers through chemical bonding, thereby endowing the cotton fibers with long-lasting photodynamic antibacterial effects.

[0026] In this application, water-soluble silver salt is used as the silver source and monohydrogen phosphate is used as the phosphoric acid source to deposit silver phosphate on the surface of bismuth vanadate. Silver phosphate and bismuth vanadate can form a heterojunction structure, which enhances photocatalytic activity and thus improves the photodynamic antibacterial effect of cotton fibers. Detailed Implementation

[0027] The present invention will be further illustrated by specific examples below. However, it should be noted that the specific material ratios, process conditions and results described in the embodiments of the present invention are only for illustrating the present invention and cannot be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0028] One embodiment of this application provides a method for preparing antibacterial modified cotton fiber based on photocatalysis, comprising the following steps: S1. Add bismuth vanadate powder and sodium dodecylbenzene sulfonate to water, stir, and obtain a mixture; S2. Add octenyl succinic acid starch ester to water and gelatinize under stirring to obtain a gelatinized liquid; S3. Mix the gelatinized liquid and the mixture, homogenize, and spray dry to obtain microcapsules; S4. Add microcapsules to ethanol, and add azobisisobutyronitrile under stirring to obtain the modified solution; S5. Cotton fibers are pre-soaked in water to swell, then placed in a modification solution and reacted under a protective gas atmosphere. After washing and drying, antibacterial modified cotton fibers based on photocatalysis are obtained.

[0029] In this application, bismuth vanadate powder is used as the core material, sodium dodecylbenzenesulfonate is used as the emulsifier, and octenyl succinate starch ester is used as the wall material to prepare microcapsules. Azobisisobutyronitrile decomposes upon heating to generate free radicals. Under the initiation of free radicals, octenyl succinate starch ester, which serves as the wall material of the microcapsules, undergoes a grafting reaction with cotton fibers. That is, this application introduces photocatalytically active bismuth vanadate powder into cotton fibers through chemical bonding, thereby endowing the cotton fibers with long-lasting photodynamic antibacterial effects.

[0030] In one embodiment of this application, in step S1, the mass ratio of sodium dodecylbenzenesulfonate to water is 0.05-0.12:100, preferably 0.06-0.12:100; the mass ratio of bismuth vanadate powder to water is 0.08-0.15:100, preferably 0.09-0.15:100.

[0031] In another embodiment of this application, in step S1, after modifying the bismuth vanadate powder, the obtained modified bismuth vanadate is added to water. The modification includes: dispersing the bismuth vanadate powder in water under ultrasonic conditions, stirring, sequentially adding water-soluble silver salt and monohydrogen phosphate, adjusting the pH to 6-8, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate. The molar ratio of water-soluble silver salt to monohydrogen phosphate is 2-3:1, preferably 2.5-3:1. The molar ratio of water-soluble silver salt to bismuth vanadate powder is 2-3:1, preferably 2.5-3:1.

[0032] In this application, water-soluble silver salt is used as the silver source and monohydrogen phosphate is used as the phosphoric acid source to deposit silver phosphate on the surface of bismuth vanadate. Silver phosphate and bismuth vanadate can form a heterojunction structure, which enhances photocatalytic activity and thus improves the photodynamic antibacterial effect of cotton fibers.

[0033] In one embodiment of this application, in step S2, the mass ratio of octenyl succinate starch ester to water is 0.3-0.5:100, preferably 0.4-0.5:100; the stirring speed is 140-160 r / min, preferably 145-160 r / min; the gelatinization temperature is 90-98℃, preferably 92-98℃; and the gelatinization time is 25-35 min, preferably 28-35 min.

[0034] In one embodiment of this application, in step S3, the mass ratio of bismuth vanadate powder to octenyl succinate starch ester is 1:2-5, preferably 1:3-5; during homogenization, the rotation speed is 7500-8000 r / min, preferably 7800-8000 r / min; the homogenization time is 5-10 min, preferably 8-10 min; during spray drying, the inlet air temperature is 175-185℃, preferably 178-185℃; and the outlet air temperature is 95-105℃, preferably 98-105℃.

[0035] In one embodiment of this application, in step S4, the mass ratio of microcapsules to ethanol is 4-6:100, preferably 5-6:100; the mass ratio of azobisisobutyronitrile to microcapsules is 1:4-6, preferably 1:5-6.

[0036] In one embodiment of this application, in step S5, the mass ratio of cotton fiber to water is 1:10-20, preferably 1:15-20; the swelling time is 20-30 min, preferably 25-30 min. The mass ratio of cotton fiber to modified liquid is 1:10-20, preferably 1:15-20; the reaction temperature is 50-60℃, preferably 55-60℃; the reaction time is 1-3 h, preferably 1.5-3 h; and the drying temperature is 50-60℃, preferably 55-60℃.

[0037] Another embodiment of this application also provides a photocatalytically modified antibacterial cotton fiber prepared according to the method described above.

[0038] The present invention will be described in detail below through specific examples and embodiments. It should also be understood that the following embodiments are only for specific illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0039] Example 1 A method for preparing antibacterial modified cotton fiber, the specific steps of which are as follows: S1. Add bismuth vanadate powder and sodium dodecylbenzenesulfonate to water, with the mass ratio of sodium dodecylbenzenesulfonate to water being 0.12:100 and the mass ratio of bismuth vanadate powder to water being 0.08:100. Stir to obtain a mixture. S2. Add octenyl succinate starch ester to water, with a mass ratio of octenyl succinate starch ester to water of 0.5:100. Gelatinize under stirring conditions, with a stirring speed of 140 r / min, a gelatinization temperature of 98℃, and a gelatinization time of 25 min to obtain a gelatinized liquid. S3. Mix the gelatinized liquid and the mixture, with the mass ratio of bismuth vanadate powder to octenyl succinate starch ester being 1:2, homogenize at 8000 r / min for 5 min, and spray dry at an inlet air temperature of 175℃ and an outlet air temperature of 105℃ to obtain microcapsules. S4. Add microcapsules to ethanol at a mass ratio of 6:100, and add azobisisobutyronitrile at a mass ratio of 1:6 to microcapsules under stirring to obtain the modified solution. S5. Cotton fibers were pre-soaked in water for 30 minutes to swell, with a cotton fiber to water mass ratio of 1:10. Then, the fibers were placed in a modification solution with a cotton fiber to modification solution mass ratio of 1:10. The reaction was carried out under a nitrogen atmosphere at a temperature of 60°C for 1 hour. After washing, the fibers were dried at 50°C to obtain antibacterial modified cotton fibers.

[0040] Example 2 A method for preparing antibacterial modified cotton fiber, the specific steps of which are as follows: S1. Add bismuth vanadate powder and sodium dodecylbenzenesulfonate to water, with the mass ratio of sodium dodecylbenzenesulfonate to water being 0.05:100 and the mass ratio of bismuth vanadate powder to water being 0.15:100. Stir to obtain a mixture. S2. Add octenyl succinate starch ester to water at a mass ratio of 0.3:100. Gelatinize the mixture under stirring conditions. The stirring speed is 160 r / min, the gelatinization temperature is 90℃, and the gelatinization time is 35 min to obtain a gelatinized liquid. S3. Mix the gelatinized liquid and the mixture, with the mass ratio of bismuth vanadate powder to octenyl succinate starch ester being 1:5, homogenize at 7500 r / min for 10 min, and spray dry at an inlet air temperature of 185℃ and an outlet air temperature of 95℃ to obtain microcapsules. S4. Add microcapsules to ethanol at a mass ratio of 4:100, and add azobisisobutyronitrile at a mass ratio of 1:4 to microcapsules under stirring to obtain the modified solution. S5. Cotton fibers were pre-soaked in water for 20 minutes to swell, with a cotton fiber to water mass ratio of 1:20. Then, the fibers were placed in a modification solution with a cotton fiber to modification solution mass ratio of 1:20. The reaction was carried out under a nitrogen atmosphere at a temperature of 50°C for 3 hours. After washing, the fibers were dried at 60°C to obtain antibacterial modified cotton fibers.

[0041] Example 3 A method for preparing antibacterial modified cotton fiber, the specific steps of which are as follows: S1. Add bismuth vanadate powder and sodium dodecylbenzenesulfonate to water, with the mass ratio of sodium dodecylbenzenesulfonate to water being 0.1:100 and the mass ratio of bismuth vanadate powder to water being 0.12:100. Stir to obtain a mixture. S2. Add octenyl succinate starch ester to water, with a mass ratio of octenyl succinate starch ester to water of 0.4:100. Gelatinize under stirring conditions, with a stirring speed of 150 r / min, a gelatinization temperature of 95℃, and a gelatinization time of 30 min to obtain a gelatinized liquid. S3. Mix the gelatinized liquid and the mixture, with the mass ratio of bismuth vanadate powder to octenyl succinate starch ester being 1:3, homogenize at 7800 r / min for 8 min, and spray dry at an inlet air temperature of 180℃ and an outlet air temperature of 100℃ to obtain microcapsules. S4. Add microcapsules to ethanol at a mass ratio of 5:100, and add azobisisobutyronitrile at a mass ratio of 1:5 to microcapsules under stirring to obtain the modified solution. S5. Cotton fibers were pre-soaked in water for 25 minutes to swell, with a cotton fiber to water mass ratio of 1:15. Then, the fibers were placed in a modification solution with a cotton fiber to modification solution mass ratio of 1:15. The reaction was carried out under a nitrogen atmosphere at a temperature of 55°C for 2 hours. The fibers were washed and dried at 55°C to obtain antibacterial modified cotton fibers.

[0042] Example 4 Except for the following conditions, antibacterial modified cotton fibers were prepared in the same manner as in Example 3: S1. Bismuth vanadate powder was dispersed in water at 60°C under ultrasonic conditions with a power of 80W. After stirring, silver nitrate and sodium monohydrogen phosphate were added in sequence. The molar ratio of silver nitrate to bismuth vanadate powder was 2:1, and the molar ratio of silver nitrate to sodium monohydrogen phosphate was 2:1. Ammonia water was added to adjust the pH to 8. The mixture was stirred, centrifuged, washed, and dried to obtain modified bismuth vanadate. Bismuth vanadate powder and sodium dodecylbenzenesulfonate were added to water, with the mass ratio of sodium dodecylbenzenesulfonate to water being 0.1:100 and the mass ratio of bismuth vanadate powder to water being 0.12:100. The mixture was stirred to obtain a solution.

[0043] The difference between this embodiment and embodiment 3 is that in step S1, after modifying the bismuth vanadate powder, the modified bismuth vanadate is added to water. The modification includes: dispersing the bismuth vanadate powder in water under ultrasonic conditions, stirring, adding silver nitrate and sodium monohydrogen phosphate in sequence, adjusting the pH to 8, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate. The molar ratio of silver nitrate to bismuth vanadate powder is 2:1, and the molar ratio of silver nitrate to sodium monohydrogen phosphate is 2:1.

[0044] Example 5 Except for the following conditions, antibacterial modified cotton fibers were prepared in the same manner as in Example 3: S1. Bismuth vanadate powder was dispersed in water at 60°C under ultrasonic conditions with a power of 80W, stirred, and silver nitrate and sodium monohydrogen phosphate were added in sequence. The molar ratio of silver nitrate to bismuth vanadate powder was 3:1, and the molar ratio of silver nitrate to sodium monohydrogen phosphate was 3:1. Ammonia water was added to adjust the pH to 6, stirred, centrifuged, washed, and dried to obtain modified bismuth vanadate. Bismuth vanadate powder and sodium dodecylbenzenesulfonate were added to water, with the mass ratio of sodium dodecylbenzenesulfonate to water being 0.1:100 and the mass ratio of bismuth vanadate powder to water being 0.12:100. The mixture was stirred to obtain a solution.

[0045] The difference between this embodiment and embodiment 3 is that in step S1, after modifying the bismuth vanadate powder, the modified bismuth vanadate is added to water. The modification includes: dispersing the bismuth vanadate powder in water under ultrasonic conditions, stirring, adding silver nitrate and sodium monohydrogen phosphate in sequence, adjusting the pH to 6, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate. The molar ratio of silver nitrate to bismuth vanadate powder is 3:1, and the molar ratio of silver nitrate to sodium monohydrogen phosphate is 3:1.

[0046] Comparative Example 1 The cotton fibers are from the same source as those in Example 3.

[0047] test The antibacterial modified cotton fibers obtained in Examples 1-5 and the cotton fiber of Comparative Example 1 were subjected to photodynamic antibacterial activity tests. Specifically: The sample was treated with a 400W metal halide lamp for 30 minutes. A filter with λ > 420nm was installed at the lamp head of the metal halide lamp, and the distance between the center of the lamp head and the sample was 15cm. The modified cotton fibers obtained in Examples 1-5 and the cotton fibers in Comparative Example 1 were processed into fabrics according to the same process. Each group of fabrics was subjected to light treatment and darkroom treatment. The light treatment was specifically as follows: a metal halide lamp with a power of 400W was used for 30 minutes. A filter with λ>420nm was installed at the lamp head of the metal halide lamp, and the distance between the center of the lamp head and the sample was 15cm. The prepared samples were cut into 1cm×1cm square pieces. Three samples were placed in each of two identical sterile 24-well plates, and each sample was placed in an adjacent well. 0.1mL of the prepared bacterial solution was inoculated on the surface of each sample. Add 0.9 mL of PBS buffer to each well of two identical 24-well plates, shake for 5 min, and dilute the bacterial suspension in each well 6 times at a volume ratio of 1:10 to form 6 equal concentration bacterial suspensions. Take 10 μL of bacterial suspension from each well in order of increasing concentration and add it to a solid culture medium plate. Incubate in the dark at 37℃ for 24 h, count the colonies, and calculate the inhibition rate according to the formula: inhibition rate = (number of bacterial colonies before light - number of bacterial colonies after light) ÷ number of bacterial colonies before light * 100%. The results are shown in Table 1. Each group of samples was machine washed at room temperature for 10 minutes, with the water level at full capacity, the stirring speed at 180 r / min, the spin-drying speed at 650 r / min, and the spin-drying time at 6 minutes. After that, the samples were air-dried. This washing-air-drying cycle was repeated 50 times. The antibacterial rate was then tested again using the same method. The results are shown in Table 1.

[0048] Table 1 Results of antibacterial rate test

[0049] As shown in Table 1, the antibacterial rates of the fabrics made from the antibacterial modified cotton fibers of Examples 1-3 against Escherichia coli (ATCC 8099) and Staphylococcus aureus (ATCC 6538) did not change significantly before and after washing. This result indicates that in this application, microcapsules were prepared using bismuth vanadate powder as the core material, sodium dodecylbenzenesulfonate as the emulsifier, and octenyl succinate starch ester as the wall material. Azobisisobutyronitrile decomposes upon heating to generate free radicals. Under the initiation of these free radicals, octenyl succinate starch ester, serving as the microcapsule wall material, undergoes a grafting reaction with the cotton fibers. In other words, this application introduces photocatalytically active bismuth vanadate powder into the cotton fibers through chemical bonding, endowing the cotton fibers with a long-lasting photodynamic antibacterial effect.

[0050] As shown in Table 1, compared with Example 3 (without modification of bismuth vanadate), Example 4 (in step S1, after modifying the bismuth vanadate powder, the obtained modified bismuth vanadate was added to water; the modification included: dispersing the bismuth vanadate powder in water under ultrasonic conditions, stirring, adding silver nitrate and sodium monohydrogen phosphate sequentially, adjusting the pH to 8, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate; the molar ratio of silver nitrate to bismuth vanadate powder was 2:1, and the molar ratio of silver nitrate to sodium monohydrogen phosphate was 2:1) 1) and Example 5 (in step S1, after modifying bismuth vanadate powder, the obtained modified bismuth vanadate is added to water. The modification includes: dispersing bismuth vanadate powder in water under ultrasonic conditions, stirring, adding silver nitrate and sodium monohydrogen phosphate sequentially, adjusting the pH to 6, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate, with a molar ratio of silver nitrate to bismuth vanadate powder of 3:1 and a molar ratio of silver nitrate to sodium monohydrogen phosphate of 3:1) fabrics processed from antibacterial modified cotton fibers show significantly improved antibacterial rates against Escherichia coli (ATCC 8099) and Staphylococcus aureus (ATCC 6538). This result indicates that in this application, using water-soluble silver salt as the silver source and monohydrogen phosphate as the phosphoric acid source, silver phosphate is deposited on the surface of bismuth vanadate. Silver phosphate and bismuth vanadate can form a heterojunction structure, enhancing photocatalytic activity and thus improving the photodynamic antibacterial efficacy of cotton fibers.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing antibacterial modified cotton fiber based on photocatalysis, characterized in that, Includes the following steps: S1. Add bismuth vanadate powder and sodium dodecylbenzene sulfonate to water, stir, and obtain a mixture; S2. Add octenyl succinic acid starch ester to water and gelatinize under stirring to obtain a gelatinized liquid; S3. Mix the gelatinized liquid and the mixture, homogenize, and spray dry to obtain microcapsules; S4. Add microcapsules to ethanol, and add azobisisobutyronitrile under stirring to obtain the modified solution; S5. Cotton fibers are pre-soaked in water to swell, then placed in a modification solution and reacted under a protective gas atmosphere. After washing and drying, antibacterial modified cotton fibers based on photocatalysis are obtained.

2. The preparation method according to claim 1, characterized in that, In step S1, the mass ratio of sodium dodecylbenzenesulfonate to water is 0.05-0.12:100; And / or, in step S1, the mass ratio of the bismuth vanadate powder to water is 0.08-0.15:

100.

3. The preparation method according to claim 1, characterized in that, In step S1, after modifying the bismuth vanadate powder, the modified bismuth vanadate is added to water. The modification includes: dispersing the bismuth vanadate powder in water under ultrasonic conditions, stirring, adding water-soluble silver salt and monohydrogen phosphate in sequence, adjusting the pH to 6-8, stirring, centrifuging, washing, and drying to obtain modified bismuth vanadate.

4. The preparation method according to claim 3, characterized in that, In step S1, the molar ratio of the water-soluble silver salt to the monohydrogen phosphate is 2-3:1; And / or, in step S1, the molar ratio of the water-soluble silver salt to the bismuth vanadate powder is 2-3:

1.

5. The preparation method according to claim 1, characterized in that, In step S2, the mass ratio of the octenyl succinic acid starch ester to water is 0.3-0.5:100; And / or, in step S2, the stirring speed is 140-160 r / min during the stirring process; And / or, in step S2, the gelatinization temperature is 90-98℃, and the gelatinization time is 25-35 min.

6. The preparation method according to claim 1, characterized in that, In step S3, the mass ratio of bismuth vanadate powder to octenyl succinate starch ester is 1:2-5; And / or, in step S3, during the homogenization process, the rotation speed is 7500-8000 r / min, and the homogenization time is 5-10 min; And / or, in step S3, during the spray drying process, the inlet air temperature is 175-185℃ and the outlet air temperature is 95-105℃.

7. The preparation method according to claim 1, characterized in that, In step S4, the mass ratio of the microcapsules to ethanol is 4-6:100; And / or, in step S4, the mass ratio of the azobisisobutyronitrile to the microcapsules is 1:4-6.

8. The preparation method according to claim 1, characterized in that, In step S5, the mass ratio of cotton fiber to water is 1:10-20; And / or, in step S5, the mass ratio of the cotton fiber to the modified liquid is 1:10-20.

9. The preparation method according to claim 1, characterized in that, In step S5, the reaction temperature is 50-60℃, and the reaction duration is 1-3 hours. And / or, in step S5, the drying temperature is 50-60°C.

10. A photocatalytically modified antibacterial cotton fiber prepared according to any one of claims 1-8.

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