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Preparation method of water-resistant renewable nanocellulose film

A technology of nano-cellulose and water resistance, which is applied in the field of preparation of water-resistant and renewable nano-cellulose films, can solve the problems of high cost and poor water resistance, and achieve the effects of low cost, reduced production cost and good mechanical properties

Active Publication Date: 2018-06-26
南京东焱氢能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although nanocellulose has a series of advantages such as degradability, excellent mechanical properties, and sufficient sources, its wide application is mainly restricted by two points: high cost and poor water resistance.

Method used

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  • Preparation method of water-resistant renewable nanocellulose film
  • Preparation method of water-resistant renewable nanocellulose film
  • Preparation method of water-resistant renewable nanocellulose film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 5 g of dry weight pulp, place it in 100 mL of water and soak for 4 hours, mechanically stir the soaked pulp, stir for 30 minutes at a speed of 300 rpm, and then stir for 2 hours at a speed of 900 rpm. The stirred pulp was pulverized in an ultrasonic pulverizer for 10 minutes to obtain a pulp suspension, which was set aside.

[0034] Weigh 78 mg TEMPO and 514 mg NaBr, add 125 mL deionized water, stir and dissolve completely to obtain a TEMPO / NaBr mixture, then add the pulp suspension prepared above into the above TEMPO / NaBr mixture for 10 minutes for ultrasonic dispersion, and then Add 30 mL of NaClO solution with a mass concentration of 12%, and react under magnetic stirring for 1 hour at room temperature, then add NaOH solution with a mass concentration of 0.5 mol / L drop by drop, control the pH value of the reaction system at 10.5, and continue to The reaction was stirred for 3 h to obtain the oxidized pulp solution of TEMPO / NaClO / NaBr system.

[0035] Ultrasoni...

Embodiment 2

[0042] The same as in Example 1, but the amount of TEMPO and NaBr in step (2) was changed to 39 mg and 257 mg, and the amount of NaClO solution with a mass concentration of 12% was changed to 15 mL.

Embodiment 3

[0044] The same as in Example 1, but the amount of TEMPO and NaBr in step (2) was changed to 117 mg and 771 mg, and the amount of NaClO solution with a mass concentration of 12% was changed to 45 mL.

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Abstract

The invention relates to a preparation method of a waterproof renewable nano cellulose thin film. The preparation method includes: pre-treating paper pulp through a mechanical method, adopting a TEMPO / NaClO / NaBr system for catalytic oxidation treatment, and obtaining a nano cellulose suspension after ultrasonic smashing and high-pressure homogenizing; adopting a semi-drying / semi-natural-drying method to obtain renewable nano cellulose; adopting an alcohol solution of polymethyl triethoxysilane for spray-coating, and allowing natural drying to obtain the waterproof renewable nano cellulose thin film. The method combines the mechanical method with a chemical method, thereby being capable of preparing the waterproof renewable nano cellulose thin film, so that production cost of nano cellulose is lowered substantially, production efficiency of nano cellulose is improved, and yield is up to higher than 95%; hydrophobic treatment comparison experiments show that contact angle of the nano cellulose thin film with the surface not being hydrophobically treated is 45-55 degrees while that of the nano cellulose thin film with the surface hydrophobically treated is 110-140 degrees. The preparation method has the advantages of environment-friendly production, simplicity and convenience in operation, high preparation yield, low cost, no environment pollution and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of a water-resistant regenerated nano-cellulose film. Background technique [0002] In recent years, with the decline of oil and coal reserves, the rise of energy costs and the increasing attention and attention to environmental pollution in various countries, the application of renewable resources in industry, science and technology, and medicine has become more and more extensive. Cellulose has gradually entered the field of vision of materials due to its abundant reserves in nature and its excellent characteristics of renewability and degradability. Nanocellulose (NCC) is an ultrafine fiber with a diameter of less than 100 nm. Due to its huge specific The surface area has its unique properties in many aspects such as surface adsorption, electricity, magnetism and optics, and has broad application prospects. At the same time, cellulose is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B16/00C08J5/18
CPCC08B16/00C08J5/18C08J2301/02
Inventor 杨正龙
Owner 南京东焱氢能源科技有限公司