Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • 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 present invention provides a cellulose nano paper with excellent single-sided electrical conductivity, electromagnetic shielding function and thermal anisotropy Paper

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Embodiment 1

[0032] (1) 10 g of tobacco rods were mechanically crushed to 20 mesh, and added to a formic acid solution with a concentration of 80 wt%. The content of lignin in the tobacco rod is 31%, and the weight ratio of the added tobacco rod to the formic acid solution is 1:50. After reacting at a temperature of 90°C and a stirring speed of 800rpm for 8 hours, the hydrolysis residue was washed until neutral; then dimethyl sulfoxide was added to the solid for replacement to obtain a suspension of cellulose nanofibrils; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 0.5wt%, the pressure is 100 MPa, and the homogenization times are 10 times; after the treatment, a uniform dispersion of cellulose nanofibrils is obtained. The content of lignin in the treated cellulose nanofibrils is 17%; at the same time, the hydrolyzed product is subjected to solid-liquid separation, and the separated liquid is subjected to vacuum distillation to recover formic...

Embodiment 2

[0037] (1) Mechanically pulverize 10 g of unbleached softwood pulp to 20 mesh, and add it into a formic acid solution with a concentration of 65 wt%. The content of lignin in the unbleached softwood pulp is 13%, and the weight ratio of added wood pulp to formic acid solution is 1:25. After reacting for 9 hours at a temperature of 100°C and a stirring speed of 900rpm, the hydrolysis residue was washed until neutral; then dimethylacetamide was added to the solid for replacement to obtain a suspension of cellulose nanofibrils; 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 times; after the treatment, a uniform dispersion of cellulose nanofibrils is obtained. The content of lignin in the cellulose nanofibrils after treatment is 8.2%. At the same time, the hydrolyzate is subjected to solid-liquid separation, and the separated liquid is subjected to vacuum distillation t...

Embodiment 3

[0042] (1) Mechanically pulverize 10 g of corn bracts to 20 meshes, and add them into a formic acid solution with a concentration of 85 wt%. 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 300rpm, the hydrolysis residue was washed until neutral; then dimethylacetamide was added to the solid for replacement to obtain a suspension of cellulose nanofibrils; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 0.6wt%, the pressure is 120MPa, and the number of homogenization is 5 times; after the treatment, a uniform dispersion of cellulose nanofibrils is obtained. The content of lignin in the cellulose nanofibrils after treatment is 9.5%. At the same time, the hydrolyzate is subjected to solid-liquid separation, and the separated liquid is subjected to vacuum distillation to recover ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com