Carboxyl nanocellulose and preparation method and application thereof

A technology of nanocellulose and microcrystalline cellulose, which is applied in the field of preparation of carboxy nanocellulose, can solve the problems of enhancing infectivity of bacteria, secondary infection of sick patients, long use time, etc., and achieves improved mechanical properties, low cost, The effect of good dispersion and interfacial compatibility

Pending Publication Date: 2021-01-29
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, rubber materials are also widely used in the medical field, but rubber products such as rubber gloves and catheters used in the treatment of diseases, due to improper storage or long-term use, have defects on their inner and outer surfaces. Germs, so as to enhance the infectivity of the germs or cause secondary infection to the sick patient

Method used

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  • Carboxyl nanocellulose and preparation method and application thereof
  • Carboxyl nanocellulose and preparation method and application thereof
  • Carboxyl nanocellulose and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Example 1 A preparation method of carboxyl nanocellulose / carboxyl nitrile rubber composite material B1

[0034]This embodiment provides a preparation method of carboxyl nanocellulose / carboxyl nitrile rubber composite material B1:

[0035]1) Weigh 2 kg of microcrystalline cellulose dissolved in 4 kg of deionized water, continue to add 1.4 kg of 30% by mass hydrogen peroxide solution and 1.5 g of anhydrous copper sulfate, set the reaction temperature in the circulating shaker to After 72 hours of constant temperature reaction at 35°C, the reaction solution was placed in a centrifuge for three centrifugation treatments, and the upper layer solution was the suspension A1 of carboxyl nanocellulose;

[0036]2) Weigh 1kg of carboxyl nanocellulose suspension A1, add it to 50kg of carboxyl nitrile rubber emulsion with a solid content of 40% and a carboxyl group content of 20%, and mechanically stir (1000r / min) for 50 minutes, then place it on the plate. Bake in a blast oven at a temperature of ...

Embodiment 2~6

[0038]Example 2~6 Preparation method of carboxyl nanocellulose / carboxyl nitrile rubber composite material B2~B6

[0039]Examples 2 to 6 respectively provide a preparation method of carboxyl nanocellulose / carboxyl nitrile rubber composite materials B2 to B6. The preparation method is basically the same as that of Example 1. The difference lies only in some relevant process parameters. For specific process parameters, see Table 1.

[0040]Table 1: List of preparation process parameters of carboxyl nanocellulose / carboxyl nitrile rubber composite materials B2~B6

[0041]

[0042]

[0043]Other process parameters and operations are the same as in Example 1.

Embodiment 7

[0044]Example 7 Comparison of thermal properties between carboxyl nanocellulose and traditional commercial nanocellulose

[0045]1) Weigh 2 kg of microcrystalline cellulose dissolved in 4 kg of deionized water, continue to add 2 kg of 14% sodium hypochlorite solution to react for 72 hours, then add HCl to stop the reaction, then use ultrasonic treatment to disperse the sample, centrifuge Obtain the milky white colloid once, place the colloid in a dialysis bag for desalination for several days, and then freeze-dry for 24 hours to obtain the traditional commercial nanocellulose;

[0046]2) Select the carboxyl nanocellulose prepared in Example 1 and the traditional commercial nanocellulose for thermal performance test, the test results are as followsfigure 1 Shown. Fromfigure 1 It can be seen that, at the same temperature, commercial cellulose degrades faster, while oxidized nanocellulose can still maintain a small change in mass fraction, thus exhibiting stronger thermal stability.

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Abstract

The invention belongs to the field of material processing, and discloses a carboxyl nanofiber and a preparation method and application thereof. The preparation method is characterized in that microcrystalline cellulose, hydrogen peroxide and copper sulfate are subjected to a catalytic oxidation reaction, the obtained carboxyl nanocellulose, carboxyl nitrile rubber emulsion and zinc oxide are mixedto obtain the carboxyl nanocellulose/carboxyl nitrile rubber composite material. The preparation method provided by the invention has the advantages of simple process and no impurity residue in reaction; the obtained carboxyl nanocellulose has a good reinforcing effect, and meanwhile, the carboxyl nanocellulose/carboxyl nitrile rubber composite material prepared from the carboxyl nanocellulose has the characteristics of high ductility, high mechanical property, antibacterial property and the like, and shows huge potential in the fields of medical protection, food packaging and the like. The method is suitable for preparing the carboxyl nanocellulose, and is also suitable for preparing the carboxyl nanocellulose/carboxyl nitrile rubber composite material by utilizing the obtained carboxylnanocellulose.

Description

Technical field[0001]The invention belongs to the field of material processing, and relates to a preparation method and application of cellulose, in particular to a preparation method and application of carboxyl nano cellulose.Background technique[0002]As the most stored natural organic polymer material in the world, cellulose has become the most promising and environmentally friendly filler particle to replace with its excellent mechanical properties, biocompatibility, low cost and rich surface chemical activity. Use of carbon black. However, there are a large number of hydroxyl groups on the surface of cellulose, which is prone to agglomeration, which will greatly affect its dispersion in the rubber matrix. At the same time, as a strong polar substance, cellulose cannot form good interface compatibility with non-polar rubber matrix. Therefore, it is difficult to completely replace traditional carbon black reinforcing agent with cellulose for reinforcing rubber. Although there have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/04C08L13/00C08L1/04C08K3/22
CPCC08B15/04C08L13/00C08K2003/2296C08L2201/08
Inventor 胡长鹰杨家辉张水洞
Owner JINAN UNIVERSITY
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