Preparation method of nano cellulose with antibacterial property

A technology of nanocellulose and antibacterial properties, applied in the field of polymer material preparation, can solve the problems of low yield of nanocellulose preparation, poor dispersion of organic solvents, and restrictions on large-scale production, and achieve excellent antibacterial ability and biocompatibility Good performance, solve the effect of cumbersome preparation

Pending Publication Date: 2021-04-09
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanocellulose used in these methods has disadvantages such as low preparation yield, poor heat resistance and poor organic solvent dispersibility, which cause a lot of environmental pollution and limit its large-scale production.

Method used

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  • Preparation method of nano cellulose with antibacterial property
  • Preparation method of nano cellulose with antibacterial property
  • Preparation method of nano cellulose with antibacterial property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put the pine cone in an oven at 60°C for 6 h, after grinding, add 30% hydrogen peroxide solution to the ground pine cone powder at a solid-to-liquid ratio of 1:150, seal it and put it away The beaker containing pine cone powder and hydrogen peroxide solution was placed in a water bath at 60°C, heated and stirred for 6 h, then placed in an ultrasonic cleaner at 10°C, and ultrasonicated for 30 min to obtain nanocellulose.

Embodiment 2

[0033] Dry the pine needles in an oven at 50°C for 5 h. After grinding, add 10% hydrogen peroxide solution to the ground pine needle powder with a solid-to-liquid ratio of 1:50, seal it and put it in a container. The beaker of pine needle powder and hydrogen peroxide solution was placed in a water bath at 80 °C, heated and stirred for 5 h, and then placed in an ultrasonic cleaner at 5 °C for 35 min to obtain nanocellulose.

Embodiment 3

[0035] Dry the pine bark in an oven at 80°C for 10 h. After grinding, add 15% hydrogen peroxide solution to the ground pine bark powder with a solid-to-liquid ratio of 1:100, seal it and put it away. Place the beaker with pine bark powder and hydrogen peroxide solution in a water bath at 70°C, heat and stir for 7 hours, then place the beaker in an ultrasonic cleaner at 0°C for 40 minutes to obtain nanocellulose.

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Abstract

The invention provides a preparation method of nano cellulose with antibacterial property. According to the method, impurities such as lignin and hemicellulose pectin in natural biomass are removed by utilizing a hydrogen peroxide thermal oxidation treatment technology, and meanwhile, 1->4 glucosidic bonds among amorphous beta-d-glucose rings in cellulose molecular beams are broken, so that the nanocellulose with the diameter within a nano range is prepared. Meanwhile, part of hydroxyl in the cellulose is oxidized into carboxyl. Due to the fact that the surface of the cellulose has a large number of functional groups, antibacterial components contained in the biomass can be grafted to the surface of the nanocellulose through intermolecular force, hydrogen bonds or covalent bonds, and the nanocellulose is endowed with antibacterial performance. The nano cellulose prepared by the method has excellent antibacterial performance and good organic solvent dispersion stability; and the preparation process is simple, green, pollution-free, low in cost and beneficial to industrialization. The material has a wide application prospect in the field of antibacterial composite materials.

Description

technical field [0001] The invention relates to a method for preparing nanocellulose, in particular to a method for preparing antibacterial nanocellulose, and belongs to the field of polymer material preparation. Background technique [0002] The coronavirus that broke out on a large scale at the end of 2019 has become one of the deadliest epidemics in human history. Direct transmission, aerosol transmission and contact transmission are the main transmission routes of new coronary pneumonia, and antibacterial has become a hot topic during the epidemic. Due to the advantages of high specific surface area, biocompatibility and biodegradability, nanocellulose is widely used in combination with antibacterial materials to make wound dressings, antibacterial sprays, packaging materials, drug carriers and other fields. [0003] At present, most nanocellulose with antibacterial properties are synthesized from toxic heavy metal ions and the preparation process is cumbersome. The ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/04
CPCC08B15/04
Inventor 李营战陈心怡唐峰余厚咏
Owner ZHEJIANG SCI-TECH UNIV
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