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Method for manufacturing zinc oxide-cellulose nanocrystalline composite fiber film with antibacterial characteristic and photocatalytic degradation characteristic at same time

A cellulose nanocrystalline, composite fiber membrane technology, applied in fiber processing, fiber chemical characteristics, rayon manufacturing, etc., can solve the problem of poor mechanical properties, breaking strength, low Young's modulus, and poor polymer orientation of PHBV fibers. Improve and other problems, to achieve high-efficiency photocatalytic degradation characteristics, enhance mechanical and thermal properties, and solve the effect of poor interfacial compatibility

Inactive Publication Date: 2014-09-03
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the compatibility between inorganic zinc oxide particles and organic PHBV fibers is very poor, and the mechanical properties of PHBV fibers are poor, with low drawing rate, imperfect polymer orientation, low breaking strength and Young's modulus, etc.
Therefore, if we can find a method that can not only solve the problem of poor compatibility between nano-zinc oxide and PHBV, but also improve the mechanical properties of PHBV fiber membrane to a certain extent, it will not only solve the application problem of zinc oxide, but also make it suitable for use in sewage. Handling, food hygiene and other fields are fully utilized

Method used

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  • Method for manufacturing zinc oxide-cellulose nanocrystalline composite fiber film with antibacterial characteristic and photocatalytic degradation characteristic at same time
  • Method for manufacturing zinc oxide-cellulose nanocrystalline composite fiber film with antibacterial characteristic and photocatalytic degradation characteristic at same time
  • Method for manufacturing zinc oxide-cellulose nanocrystalline composite fiber film with antibacterial characteristic and photocatalytic degradation characteristic at same time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix the mixed acid solution of microcrystalline cellulose, hydrochloric acid and citric acid at a solid-to-liquid ratio of 1:50, wherein the volume ratio of citric acid to hydrochloric acid is 9:1, react at 70°C for 6 hours, and use 3mol / The pH of the solution was adjusted to 7 with L ammonia water, washed with water, centrifuged, and freeze-dried to obtain CNC powder. Disperse the CNC powder in distilled water to obtain a CNC suspension with a mass fraction of 3%, mix it with a 0.5 mol / L zinc nitrate hexahydrate aqueous solution, and slowly add a 1 mol / L sodium hydroxide solution dropwise under stirring conditions at 70 °C. After the addition, the solution was reacted for 20 minutes under stirring, washed with water, centrifuged, and then freeze-dried to obtain a CNC-ZnO hybrid material. Add CNC-ZnO and PHBV to the N,N-dimethylformamide solution, raise the temperature to 50°C, and stir thoroughly to obtain a transparent and uniform electrospinning solution. Electrospi...

Embodiment 2

[0031] Mix the mixed acid solution of microcrystalline cellulose, sulfuric acid and citric acid at a solid-to-liquid ratio of 1:40, wherein the volume ratio of citric acid to sulfuric acid is 8:1, react at 80°C for 7 hours, and use 8mol / The solution was neutralized with L potassium hydroxide to a pH of 7, washed by centrifugation and then freeze-dried to obtain CNC powder. Disperse the CNC powder in distilled water to obtain a CNC suspension with a mass fraction of 1%, mix it with a 1mol / L zinc sulfate aqueous solution, and slowly add a 2mol / L sodium hydroxide solution dropwise under stirring conditions at a temperature of 80°C. After the sodium hydroxide solution was finished, the solution was reacted for 15 minutes under stirring conditions, centrifuged, washed with water, and then freeze-dried to obtain CNC-ZnO. Add CNC-ZnO and PHBV to the chloroform solution, raise the temperature to 60°C, and stir thoroughly to obtain a transparent and uniform electrospinning solution. T...

Embodiment 3

[0033] Mix the mixed acid solution of microcrystalline cellulose, hydrochloric acid and citric acid at a solid-to-liquid ratio of 1:70, wherein the volume ratio of citric acid to hydrochloric acid is 10:1, react at 60°C for 8 hours, and use 7mol / The solution was neutralized with L sodium carbonate to a pH of 7, centrifuged, washed with water, and freeze-dried to obtain CNC powder. Disperse the CNC powder in distilled water to obtain a CNC suspension with a mass fraction of 2%, mix it with an aqueous solution of 1mol / L zinc chloride, and slowly add 0.5mol / L sodium hydroxide solution dropwise under stirring conditions at a temperature of 60°C. After the sodium hydroxide solution was added, the solution was reacted for 30 minutes under stirring conditions, centrifuged, washed with water, and then freeze-dried to obtain CNC-ZnO. After adding CNC-ZnO and PHBV to the tetrahydrofuran solution, raise the temperature to 70°C, and stir thoroughly to obtain a transparent and uniform ele...

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Abstract

The invention relates to a method for manufacturing a zinc oxide-cellulose nanocrystalline composite fiber film with the antibacterial characteristic and the photocatalytic degradation characteristic at the same time. The method includes the steps of enabling microcrystalline cellulose to be reacted for 5 hours to 10 hours under the 40 DEG C-95 DEG C mixed acid condition, adjusting the pH value to seven after the reaction is finished, and obtaining cellulose nanocrystalline powder; (2) preparing suspension liquid with the powder, mixing the suspension liquid with a zinc salt water solution, dropwise adding a sodium hydroxide solution at 30 DEG C to 95 DEG C, stirring to enable the mixture to be reacted for 5 min to 60 min after drop adding is finished, and carrying out washing and drying to obtain cellulose nanocrystalline-zinc oxide hybrid materials; (3) adding the materials and PHBV into organic solvents, raising the temperature to range 30 DEG C to 80 DEG C, and obtaining an electrostatic spinning solution; (4) carrying out electrostatic spinning on the electrostatic spinning solution, and obtaining the zinc oxide-cellulose nanocrystalline composite fiber film. According to the method, the preparing process is simple, and the obtained fiber film is a multifunctional full biodegradation product and has the antibacterial characteristic and the photocatalytic degradation characteristic.

Description

technical field [0001] The invention belongs to the field of preparation of multifunctional PHBV nanofibers, and in particular relates to a preparation method of a zinc oxide-cellulose nanocrystal composite fiber film having both antibacterial and photocatalytic degradation properties. Background technique [0002] With the continuous progress of science and technology, the rapid development of social economy, people's living standards are improving day by day. However, the excessive expansion of population and the blind exploitation of natural resources have also caused very serious environmental problems. The water pollution caused by a large amount of industrial sewage discharge has led to the deterioration of the water environment and the general decline in the quality of drinking water, which seriously threatens people's health. Therefore, effective governance and control of water pollution is particularly important in environmental governance. At present, the main wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D04H1/728D01F1/10
Inventor 余厚咏杨兴远陈国印王怡博雷晓霞
Owner ZHEJIANG SCI-TECH UNIV
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