Nano-crystalline cellulose/layered double hydroxide composite membrane and preparation method

A layered bimetal, nanocellulose technology, applied in the field of composite materials, can solve the problems of NCC film porous and flammable, high-performance material limitations, etc., and achieve the effects of controllable thickness and performance, low cost, and simple preparation method.

Active Publication Date: 2015-11-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the porous and flammable NCC film, it is limited as a high-performance material.

Method used

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  • Nano-crystalline cellulose/layered double hydroxide composite membrane and preparation method
  • Nano-crystalline cellulose/layered double hydroxide composite membrane and preparation method
  • Nano-crystalline cellulose/layered double hydroxide composite membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of NCC dispersion with negative charge on the surface.

[0030] Negatively charged NCC on the surface obtained by hydrolyzing cotton linters with sulfuric acid was dispersed in water and then ultrasonicated for 20 min to obtain a dispersion with a concentration of 0.1%.

[0031] (2) Preparation of positively charged exfoliated LDH dispersion.

[0032] The positively charged LDH stripping solution obtained by stripping in formamide solution (raw material is Mg-AlLDH, purchased from Beijing Tecleer Technology Co., Ltd.) was added with water and then ultrasonicated for 20 minutes to obtain a dispersion with a concentration of 0.05%.

[0033] (3) Preparation of nanocellulose / layered double metal hydroxide (NCC / LDH) composite membrane.

[0034] The treated quartz substrate is immersed in LDH solution, taken out after 20 minutes, rinsed and dried, then immersed in NCC solution, taken out after 20 minutes, washed and dried. By repeating this 80 times, a multi...

Embodiment 2

[0036] (1) Preparation of NCC dispersion with negative charge on the surface.

[0037] Negatively charged NCC on the surface obtained by oxidizing bleached wood pulp with persulfate was dispersed in water and then ultrasonicated for 20 min to obtain a dispersion with a concentration of 0.1%.

[0038] (2) Preparation of positively charged exfoliated LDH dispersion.

[0039] The positively charged LDH stripping solution obtained by stripping in formamide solution (the raw material is Ni-AlLDH, purchased from Beijing Tecleer Technology Co., Ltd.) was added with water and then ultrasonicated for 20 minutes to obtain a dispersion with a concentration of 0.05%.

[0040] (3) Preparation of nanocellulose / layered double metal hydroxide (NCC / LDH) composite membrane.

[0041]The treated quartz substrate is immersed in LDH solution, taken out after 20 minutes, rinsed and dried, then immersed in NCC solution, taken out after 20 minutes, washed and dried. By repeating this 80 times, a mul...

Embodiment 3

[0043] (1) Preparation of NCC dispersion with negative charge on the surface.

[0044] Negatively charged NCC on the surface obtained by hydrolyzing waste paper pulp with sulfuric acid was dispersed in water and then ultrasonicated for 20 min to obtain a dispersion with a concentration of 0.1%.

[0045] (2) Preparation of positively charged exfoliated LDH dispersion.

[0046] The positively charged LDH stripping solution obtained by stripping in formamide solution (the raw material is Zn-AlLDH, purchased from Beijing Tecleer Technology Co., Ltd.) was added with water and then ultrasonicated for 30 minutes to obtain a dispersion with a concentration of 0.05%.

[0047] (3) Preparation of nanocellulose / layered double metal hydroxide (NCC / LDH) composite membrane.

[0048] The treated quartz substrate is immersed in LDH solution, taken out after 20 minutes, rinsed and dried, then immersed in NCC solution, taken out after 20 minutes, washed and dried. By repeating this 100 times, ...

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Abstract

The invention discloses a nano-crystalline cellulose / layered double hydroxide composite membrane and a preparation method. The method comprises the following steps: (1) preparing nano-crystalline cellulose (NCC) dispersion liquid with the surface provided with negative electricity; (2) preparing stripped layered double hydroxide (LDH) with positive electricity; and (3) preparing a layered NCC / LDH ultrathin composite membrane through a layer-by-layer (LBL) technology. The method is simple and low in cost and can be performed on the conditions of normal temperature, the prepared NCC / LDH composite membrane is normalized and uniform, and the structure, thickness and performance of the composite membrane are controllable. Due to the fact that the LDH layered structure is well stored in the prepared NCC / LDH composite membrane, the performances of the NCC, such as blockage, flame retardance, antibacterium and ultraviolet protection, can be improved.

Description

technical field [0001] The invention relates to a method for preparing a nanocellulose / layered double metal hydroxide composite film, which belongs to the technical field of composite materials. Background technique [0002] Nanocellulose (NCC) is a long rod-shaped cellulose crystal with a particle size generally between 30-100 nm and a polydisperse particle size distribution. It has the basic structure and properties of cellulose, and also has the typical characteristics of nanoparticles, such as large chemical reactivity, high purity, large specific surface area, high crystallinity, high hydrophilicity, high Young's modulus, high Strength, ultra-fine structure and high transparency, etc. In view of the excellent properties of nanocellulose crystals, it has good potential applications in the fields of fine chemicals, medicine, food, composite materials, and new energy. Moreover, the film made of NCC, that is, nanocellulose film, also has the advantages of high transparenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B5/16B32B37/00
CPCB32B5/16B32B9/047B32B37/00B32B2037/1063B32B2264/04B32B2307/3065B32B2307/7145
Inventor 李海龙杜超
Owner SOUTH CHINA UNIV OF TECH
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