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A kind of surface oxidized cellulose nanofiber/layered double metal hydroxide composite film and its preparation method

A layered bimetallic and oxidized cellulose technology, which is applied in the field of composite materials, can solve the problems of low transparency, complicated process, and difficulty in guaranteeing the mechanical properties of composite films, etc., and achieve high transparency, easy dispersion, good light transmittance and The effect of mechanical strength

Active Publication Date: 2020-01-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of preparing cellulose nanofiber / layered double metal hydroxide composite film is relatively complicated, and there are problems that the mechanical properties of the composite film are not easy to guarantee, and the transparency is not high.

Method used

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  • A kind of surface oxidized cellulose nanofiber/layered double metal hydroxide composite film and its preparation method
  • A kind of surface oxidized cellulose nanofiber/layered double metal hydroxide composite film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of surface oxidized cellulose nanofiber / layered double metal hydroxide composite film, the steps are as follows:

[0049] 1) Preparation of TEMPO oxidized cellulose nanofibers: Take 0.01g TEMPO and 0.1g NaBr, add them together into 1000mL deionized water, stir magnetically at 10°C and 300r / min for 10min to make them fully mixed until TEMPO and NaBr are completely dissolved, and then Add 1g of cotton linters to the above system, then add 0.1gNaClO to the system, keep the pH of the system at 9 by dropwise adding 0.1mol / L NaOH solution, react at 10°C for 5h, and then oxidize the cellulose Filter, wash with deionized water more than 3 times, and dry to obtain TEMPO oxidized cellulose nanofibers (OCNF);

[0050] 2) Preparation of OCNF dispersion: add 0.1 g of OCNF to 99.9 g of distilled water and mechanically stir at 1600 r / min for 10 min to obtain 0.1 wt % OCNF dispersion;

[0051] 3) Prepare LDH dispersion: add 0.1g LDH to 99.9g distilled water and mechanicall...

Embodiment 2

[0056] Preparation of surface oxidized cellulose nanofiber / layered double metal hydroxide composite film, the steps are as follows:

[0057] 1) Preparation of TEMPO oxidized cellulose nanofibers: take 0.01g TEMPO and 0.01g NaBr, add them together into 100mL deionized water, stir magnetically at 30°C and 600r / min for 20min to make them fully mixed until TEMPO and NaBr are completely dissolved, and then Add 0.1 g of softwood bleached pulp to the above system, then add 1 g of NaClO to the system, keep the pH of the system at 11 by adding 0.5 mol / L NaOH solution dropwise, react at 30 ° C for 7 h, and then oxidize the cellulose Filter, wash with deionized water more than 3 times, and dry to obtain TEMPO oxidized cellulose nanofibers (OCNF);

[0058] 2) Preparation of OCNF dispersion: 1 g of OCNF was added to 99 g of distilled water and ultrasonically dispersed at 450 W for 6 minutes to obtain a 1 wt % OCNF dispersion;

[0059] 3) Preparation of LDH dispersion: Add 1 g of LDH to 99...

Embodiment 3

[0063] Preparation of surface oxidized cellulose nanofiber / layered double metal hydroxide composite film, the steps are as follows:

[0064] 1) Preparation of TEMPO oxidized cellulose nanofibers: Take 0.02g TEMPO and 0.05g NaBr, add them together into 1000mL deionized water, stir magnetically at 15°C and 400r / min for 15min to fully mix until TEMPO and NaBr are completely dissolved, then Add 1 g of bacterial cellulose to the above system, then add 1.5 g of NaClO to the system, keep the pH value of the system at 10 by dropping 0.2 mol / L NaOH solution, react at 15 ° C for 6 h, and then oxidize the cellulose Filter, wash with deionized water more than 3 times, and dry to obtain TEMPO oxidized cellulose nanofibers (OCNF);

[0065] 2) Prepare a mixed dispersion of OCNF and LDH: add 0.09g of OCNF and 0.01g of LDH to 99.9g of distilled water and mechanically stir at 1200r / min for 100min to obtain OCNF content of 0.09wt% and LDH content of 0.01wt%. mixed dispersion;

[0066] 3) Membr...

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Abstract

The invention relates to a surface-oxidized cellulose nanofiber / layered double metal hydroxide composite membrane and a production method thereof. The composite membrane is obtained through self-assembling cellulose nano-fibers with the diameter being 3-4 nm and the average length being 3-4 [mu]m and layered double metal hydroxide in water and performing membrane production. The composite membranehas very high light transmittance and excellent mechanical performances (the light transmittance reaches 85% or above, the tensile strength reaches 220-358 MPa, and the tensile modulus reaches 26-37GPa), also has the advantages of good barrier property, good hydrophobicity, good flame resistance and adjustable thickness, and has a wide application prospect in the fields of foods, medicines, andpackaging materials and functional materials of photoelectric devices.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a surface oxidized cellulose nanofiber / layered double metal hydroxide composite film and a preparation method thereof. Background technique [0002] At present, white pollution such as plastics is becoming more and more serious, and renewable materials must be developed to replace traditional petrochemical products. Therefore, biomass raw materials are becoming more and more important. Cellulose is the most abundant natural polymer in nature. It self-assembles into natural cellulose nanofibers in plants. Because this cellulose nanofiber is biodegradable, renewable, and environmentally friendly, it also has excellent mechanical properties. In recent years, it has attracted extensive attention and has become an emerging hotspot in the field of biomass nanomaterials research. [0003] LDH (Layered Double Hydroxide) is a class of inorganic supramolecular fun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08K3/26C08K3/16C08K3/22C08K3/28C08K3/30C08J5/18C08B15/02C08B15/04
CPCC08B15/02C08B15/04C08J5/18C08J2301/04C08K3/16C08K3/22C08K3/26C08K3/28C08K3/30C08K2003/3045
Inventor 杨全岭李刚吴涛石竹群蔡兵熊传溪
Owner WUHAN UNIV OF TECH
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