Nano cellulose/aramid fiber nano fiber membrane composite nano paper and preparation method thereof

A nanocellulose and nanofiber membrane technology, applied in special paper, fiber raw material processing, non-fiber pulp addition, etc., can solve the problems of weak UV shielding, poor thermal stability, low wet strength, etc., and achieve excellent UV shielding and Anti-aging properties, good temperature resistance, the effect of improving wet strength

Active Publication Date: 2019-02-26
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to utilize aramid nanofiber (aramid Nanofiber, ANF) with nanoscale structure, high strength and high modulus, high aspect ratio, temperature resistance and wet strength as a reinforcement to provide a nanocellulose / Aramid nanofiber film composite nanopaper and its preparation method to overcome the shortcomings of nanocellulose-based materials such as easy moisture absorption, low wet strength, poor thermal stability, weak ultraviolet shielding, and easy aging

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  • Nano cellulose/aramid fiber nano fiber membrane composite nano paper and preparation method thereof

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[0028] A preparation method of nanocellulose / aramid nanofiber membrane composite nanopaper, comprising the following steps:

[0029]Step 1: Using bleached softwood kraft pulp board as raw material, prepare nanocellulose by TEMPO (2,2,6,6-tetramethylpiperidine-nitrogen-oxide) oxidation method, and then dilute with water to a mass concentration of 0.05% to 0.5% nanocellulose dispersion; the diameter of the nanocellulose in the nanocellulose dispersion is 20 to 30 nm; the obtained nanocellulose dispersion is dehydrated on a filter with a mesh number of 300 Shaping and drying at 80-105°C for 7-15 minutes to obtain nanocellulose nanopaper, which is denoted as CNF nanopaper; the quantification of the CNF nanopaper is 20-50g / m 2 , with a thickness of 20-50 μm.

[0030] Step 2: Using para-aramid chopped fibers as raw materials, aramid nanofiber dispersion is prepared in a mixed solution system of potassium hydroxide and dimethyl sulfoxide; in the aramid nanofiber dispersion, aramid n...

Embodiment 1

[0036] A nanocellulose / aramid nanofiber membrane composite nanopaper, the composite nanopaper is composed of nanocellulose nanopaper impregnated with polydimethyldiallylammonium chloride and aramid nanofiber membrane The composite nano paper has a multi-layer structure, wherein the nanocellulose nano paper impregnated with polydimethyldiallylammonium chloride is the matrix, and the aramid fiber nanofiber dispersion is formed by protonation reduction The nanomembrane is combined with the nanocellulose nanopaper matrix through layer-by-layer self-assembly; the quantitative amount of the nanocellulose nanopaper is 20g / m 2 , with a thickness of 20 μm; the number of composite layers of the aramid nanofilm is 1 layer;

[0037] A preparation method of nanocellulose / aramid nanofiber membrane composite nanopaper, comprising the following steps:

[0038] Step 1: Using bleached softwood kraft pulp board as raw material, prepare nanocellulose by TEMPO (2,2,6,6-tetramethylpiperidine-nitro...

Embodiment 2

[0042] A nanocellulose / aramid nanofiber membrane composite nanopaper, the composite nanopaper is composed of nanocellulose nanopaper impregnated with polydimethyldiallylammonium chloride and aramid nanofiber membrane The composite nano paper has a multi-layer structure, wherein the nano cellulose nano paper impregnated with polydimethyldiallylammonium chloride is aramid nanofiber dispersion formed by protonation reduction The film is combined with the nanocellulose nanopaper impregnated with polydimethyldiallylammonium chloride through layer-by-layer self-assembly; the quantitative weight of the nanocellulose nanopaper substrate is 25g / m 2 , with a thickness of 25 μm; the number of composite layers of the aramid nanofilm is 3;

[0043] A preparation method of nanocellulose / aramid nanofiber membrane composite nanopaper, comprising the following steps:

[0044] Step 1: Using bleached softwood kraft pulp board as raw material, prepare nanocellulose by TEMPO (2,2,6,6-tetramethylp...

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Abstract

The invention discloses nano cellulose/aramid fiber nano fiber membrane composite nano paper and a preparation method thereof. An aramid fiber nano fiber which is of a nano scale structure and has high strength and high modulus, a large length-diameter ratio and good temperature resistance and moisture resistance is used as a reinforcing body through in-situ filming in a layer-by-layer self-assembling mode, similarity and compatibility of micromorphologies of the aramid fiber nano fiber and nano cellulose and the advantage that a strong network cross-linking structure is easily formed by richfunctional groups on the surfaces of the fibers are sufficiently brought into play, the wet strength, ultraviolet ray shielding properties, temperature resistance and aging resistance of a nano fiber-based material are synergistically improved, a high-performance nano cellulose-based novel material which has excellent mechanical strength and water resistance, outstanding ultraviolet ray shieldingproperties and aging resistance as well as good temperature resistance is developed, the service performance and the service life of a conventional nano cellulose-based material in harsh use environments such as high temperatures, high humidity, ultraviolet radiation and the like can be improved, product grades can be improved, and the requirements of application in high-end fields can be met.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials and papermaking, and in particular relates to nanocellulose / aramid nanofiber membrane composite nanopaper and a preparation method thereof. Background technique [0002] As a renewable and environmentally friendly nanofiber material, nanocellulose (Cellulosenanofiber, CNF) has the basic structure and properties of cellulose (light weight, renewable raw materials, biodegradability and biocompatibility), at the same time, It also has the typical characteristics of nanomaterials (high specific surface area, large aspect ratio, high transparency, high crystallinity, high surface activity), etc., endowing nanocellulose with excellent mechanical properties, optical properties and rheological properties. These characteristics also make it more widely used in addition to the traditional application of cellulose, in optical materials, flexible displays, composite material reinforcement, battery separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/45D21H27/38D21F11/00
CPCD21F11/00D21H17/45D21H27/38
Inventor 杨斌张美云陆赵情宋顺喜谭蕉君聂景怡罗晶晶
Owner SHAANXI UNIV OF SCI & TECH
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