Composite cellulose nano-paper with single-sided conductivity, thermal conductivity and electromagnetic shielding function

A composite cellulose and electromagnetic shielding technology, which is applied in the direction of cellulose pulp post-treatment, cellulose pulp post-treatment modification, non-fibrous pulp addition, etc., can solve the problems of poor conductivity and reduced strength, and achieve increased strength and improved strength Low, cheap effect

Pending Publication Date: 2020-06-05
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor electrical conductivity of cellulose nano paper and greatly reduced strength in high humidity environment in the prior art, the

Method used

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  • Composite cellulose nano-paper with single-sided conductivity, thermal conductivity and electromagnetic shielding function
  • Composite cellulose nano-paper with single-sided conductivity, thermal conductivity and electromagnetic shielding function
  • Composite cellulose nano-paper with single-sided conductivity, thermal conductivity and electromagnetic shielding function

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] (1) Mechanically crush 10 g of tobacco stems to 20 meshes, and add them to a formic acid solution with a concentration of 80 wt%. The content of lignin in the tobacco stem is 31%, and the weight ratio of the tobacco stem added to the formic acid solution is 1:50. After reacting for 8 hours at a temperature of 90°C and a stirring speed of 800 rpm, the hydrolyzed residue was washed to neutrality; then dimethyl sulfoxide was added to the solid substance for replacement to obtain a cellulose nanofibril suspension; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 0.5 wt%, the pressure is 100 MPa, and the homogenization times are 10 times; after the treatment, a uniform cellulose nanofibril dispersion liquid is obtained. After the treatment, the lignin content in the cellulose nanofibrils is 17%; at the same time, the hydrolyzed product is subjected to solid-liquid separation, and the separated liquid is subjected ...

Example Embodiment

[0036] Example 2:

[0037] (1) 10g of unbleached softwood pulp was mechanically crushed to 20 mesh, and added to a formic acid solution with a concentration of 65% by weight. The content of lignin in the unbleached softwood pulp is 13%, and the weight ratio of the added wood pulp to the formic acid solution is 1:25. After reacting for 9 hours at a temperature of 100°C and a stirring speed of 900 rpm, the hydrolyzed residue was washed to neutrality; then, dimethylacetamide was added to the solid to be replaced to obtain a cellulose nanofibril suspension; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 1 wt%, the pressure is 110 MPa, and the homogenization times are 12; after the treatment, a uniform cellulose nanofibril dispersion liquid is obtained. After the treatment, the lignin content in the cellulose nanofibrils was 8.2%, and the hydrolyzed product was separated into solid and liquid, and the separated liquid was subjected to vac...

Example Embodiment

[0041] Example 3:

[0042] (1) Mechanically crush 10 g of corn bracts to 20 mesh, and add them to a formic acid solution with a concentration of 85% by weight. The content of lignin in the corn bracts is 12%, and the weight ratio of the added corn bracts to the formic acid solution is 1:100. After reacting for 7 hours at a temperature of 91°C and a stirring speed of 300 rpm, the hydrolyzed residue was washed to neutrality; then, dimethylacetamide was added to the solid for substitution to obtain a cellulose nanofibril suspension; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 0.6 wt%, the pressure is 120 MPa, and the homogenization times are 5; after the treatment, a uniform cellulose nanofibril dispersion liquid is obtained. After the treatment, the lignin content in the cellulose nanofibrils is 9.5%, and the hydrolyzed product is separated into solid and liquid, and the separated liquid is subjected to vacuum distillation to recove...

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Abstract

Aiming at the problems of poor conductivity of a cellulose nano-paper and great reduction of strength in a high-humidity environment in the prior art, the invention provides the composite cellulose nano-paper. The composite cellulose nano-paper is prepared by the following method: firstly, preparing a cellulose nano-fibril wet film, namely a CNF layer from natural plant fibers containing lignin asa raw material, wherein the cellulose raw material is subjected to acid-based hydrolysis pretreatment, slowly pouring a graphene oxide dispersion liquid on the CNF layer wet film, and performing vacuum filtration to form a graphene oxide layer, namely a GO layer, drying to obtain a double-layer dry film of cellulose nanofibril composite graphene oxide, namely a CNF/GO dry film, carrying out reduction treatment on the CNF/rGO dry film in a water phase, and drying to obtain the CNF/rGO dry film-composite cellulose nano paper. The composite cellulose nano paper not only has excellent single-sided electrical conductivity, an electromagnetic shielding function and thermal conductivity anisotropy and but also is good in flexibility and high in strength. The preparation method is simple, green,environment-friendly and low in cost.

Description

technical field [0001] The invention relates to the field of cellulose functional materials, in particular to a preparation method of cellulose nano paper with excellent electrical conductivity, electromagnetic shielding and thermal conductivity anisotropy. Background technique [0002] With the rapid development of the electrical industry and the increasing popularity of electronic products, electromagnetic radiation has become another major pollution source after noise pollution, air pollution, water pollution, and solid waste pollution. Electromagnetic radiation will not only cause information leakage, interfere with the normal operation of surrounding electronic equipment, but also endanger human health. At present, commercial electromagnetic shielding materials are mainly made of non-degradable petroleum-based materials or non-renewable metal materials, which bring a certain degree of harm to the environment. Therefore, the development and utilization of renewable resou...

Claims

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Application Information

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IPC IPC(8): D21J5/00D21H11/18D21H17/00D21C9/00D21C3/04C08J7/06C08J5/18C08L1/02C08L97/00
CPCC08J5/18C08J7/06C08J2301/02C08J2497/00D21C3/04D21C9/005D21H11/18D21H17/00D21J5/00
Inventor 李滨车欣鹏刘超崔球
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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