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Method for in-situ reinforcement of performance of paper-based material by aramid nanofibers

A technology of nanofiber and aramid fiber, which is applied in the direction of fiber raw material processing, reinforcing agent addition, non-fiber pulp addition, etc. It can solve the problems of nanofiber component loss, large paper web moisture, and increase production cost, and achieve nanofiber High retention rate, improved surface smoothness, and improved heat resistance

Active Publication Date: 2020-06-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing aramid paper, the precipitated fiber or pulp fiber acts as a reinforcing component, which can effectively improve the strength of the paper. However, when the amount of this component is too much, the wet paper web will filter water too slowly during the forming process, resulting in Excessive moisture will easily cause paper breakage, which will reduce the runnability and production efficiency of the paper machine and increase the production cost
In order not to destroy the thermal stability of aramid paper, there are also reports to increase the strength of aramid paper by adding aramid nanofibers to the slurry, but due to the small size of the nanofibers, the use of existing wet forming methods will lead to The problem of large component loss
When the amount added is too much, it will also reduce the water filtration performance and affect the runnability of the paper machine

Method used

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  • Method for in-situ reinforcement of performance of paper-based material by aramid nanofibers
  • Method for in-situ reinforcement of performance of paper-based material by aramid nanofibers
  • Method for in-situ reinforcement of performance of paper-based material by aramid nanofibers

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Embodiment 1

[0033] A method for in-situ performance enhancement of paper-based materials by aramid nanofibers in this embodiment, the specific preparation steps are as follows:

[0034] (1) Preparation of paper-based materials: The meta-aramid fiber paper-based composite material is prepared by traditional wet forming, and the ratio of meta-aramid fibrids to meta-aramid chopped fibers is 1:1;

[0035] (2) Use DMSO, KOH and H for para-aramid chopped fibers 2 O is dissolved into the aramid fiber nanofiber solution whose mass concentration is 0.25%;

[0036] (3) Immerse the meta-aramid fiber paper-based composite material prepared in step (1) in the aramid nanofiber solution obtained in step (2); when the meta-aramid fiber paper-based composite material is completely After soaking, wait for 20s to make it fully absorbed;

[0037] (4) Transfer the meta-aramid fiber paper-based composite material impregnated in step (3) to water for soaking, and the protonation reduction time is about 24 hou...

Embodiment 2

[0042] A method for in-situ performance enhancement of paper-based materials by aramid nanofibers in this embodiment, the specific preparation steps are as follows:

[0043] (1) Preparation of paper-based materials: The meta-aramid fiber paper-based composite material is prepared by traditional wet forming, and the ratio of meta-aramid fibrids to meta-aramid chopped fibers is 1:1

[0044] (2) Use DMSO, KOH and H for para-aramid chopped fibers 2 O is dissolved into aramid fiber nanofiber solution with a mass concentration of 0.5%;

[0045] (3) Immerse the meta-aramid fiber paper-based composite material prepared in step (1) in the aramid nanofiber solution obtained in step (2); when the meta-aramid fiber paper-based composite material is completely After soaking, wait for 20s to make it fully absorbed;

[0046] (4) Transfer the meta-aramid fiber paper-based composite material impregnated in step (3) to water for soaking, so that under the action of water, the aramid fiber nan...

Embodiment 3

[0050] A method for in-situ performance enhancement of paper-based materials by aramid nanofibers in this embodiment, the specific preparation steps are as follows:

[0051] (1) Preparation of paper-based materials: The meta-aramid fiber paper-based composite material is prepared by traditional wet forming, and the ratio of meta-aramid fibrids to meta-aramid chopped fibers is 1:1

[0052] (2) Use DMSO, KOH and H for para-aramid chopped fibers 2 O is dissolved into aramid nanofiber solution with a mass concentration of 0.75%;

[0053] (3) Immerse the meta-aramid fiber paper-based composite material prepared in step (1) in the aramid nanofiber solution obtained in step (2); when the meta-aramid fiber paper-based composite material is completely After soaking, wait for 20s to make it fully absorbed;

[0054] (4) Transfer the meta-aramid fiber paper-based composite material impregnated in step (3) to water for soaking, so that under the action of water, the aramid fiber nanofibe...

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Abstract

The invention discloses a method for in-situ reinforcement of performance of paper-based material by aramid nanofibers. Aramid fiber dissolving solutions with different concentrations are used for treating different aramid fiber paper-based composite materials. According to the method, the strength performance and the breakdown performance of the paper-based composite material can be improved to agreat extent, the satisfactory effect can be achieved on improvement of the performance of the paper-based composite material, operation is convenient and easy, glue-free reinforcement is achieved, the material can be used under complex conditions, and the method is high in applicability and has good application prospects.

Description

technical field [0001] The invention belongs to the field of paper-based composite materials, and in particular relates to a method for in-situ enhancing the performance of paper-based materials by aramid fiber nanofibers. Background technique [0002] Due to its excellent heat resistance, light weight, flexibility, and multi-functionality, paper-based composite materials have broad application prospects in daily life, aerospace, rail transit, and electrical appliances. With the rapid development of my country's infrastructure, the requirements for various paper-based composite materials, especially in terms of strength, are also getting higher and higher. Due to the pore structure formed during the forming process of the paper-based composite material, the improvement of its strength and other properties has reached a bottleneck stage. [0003] At present, the strength of paper-based composite materials can generally be improved by adjusting the fiber ratio, fiber type, us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/55D21H21/18
CPCD21H17/55D21H21/18
Inventor 宋顺喜甄晓丽张美云罗延薇杨斌张帅
Owner SHAANXI UNIV OF SCI & TECH
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