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Gradient-structure nanometer aramid paper making method

A technology of gradient structure and manufacturing method is applied in the field of manufacturing high-strength para-aramid paper, which can solve the problems of limited effect of improving paper evenness, inability to guarantee high strength of paper, complicated process, etc. The effect of compact and dense paper structure and high reactivity

Inactive Publication Date: 2019-03-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of this method is relatively complicated. Due to the particularity of aramid fibrids and pulp fibers, the thickness of the individual fibers is different, so it is difficult to screen, and the effect on improving the paper evenness is limited; and due to the surface inertia of aramid fibers, The high strength of the paper cannot be guaranteed without other assistance only by relying on a small amount of hydrogen bonding between ordinary aramid fibers

Method used

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  • Gradient-structure nanometer aramid paper making method
  • Gradient-structure nanometer aramid paper making method
  • Gradient-structure nanometer aramid paper making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) the equipment of pretreatment liquid: ammoniacal liquor is diluted into the solution that mass fraction is 10%, obtains pretreatment liquid, for subsequent use;

[0044] (2) Fiber pretreatment: maintain the pretreatment solution prepared in step (1) at a temperature of 50°C, and pretreat the para-aramid fiber short cut fibers (purchased by DuPont) with a length of 5-6mm , the pretreatment process is to treat the fiber with ammonia water that just covers the amount of fiber for 60 minutes. During the treatment, it is necessary to use ultrasonic waves for co-processing. The ultrasonic power is 50w, and it needs to be stirred once every 15 minutes. drying. The scanning electron microscope pictures of the processed aramid chopped fibers are as follows: figure 1 as shown, figure 1 It can be seen that the surface of the para-aramid chopped fiber is very smooth and clean after pretreatment, and there is no residual impurity, which also reflects the surface inertia of the...

Embodiment 2

[0053] (1) Preparation of pretreatment liquid: diluting sodium dodecylbenzenesulfonate into a solution with a mass fraction of 1% to obtain a pretreatment liquid;

[0054] (2) Fiber pretreatment: the prepared pretreatment solution in step (1) is maintained at a temperature of 60° C., and the para-aramid chopped fibers (purchased by DuPont) with a length of 5-6 mm are pretreated. The pretreatment process is to treat the fibers with a sodium dodecylbenzenesulfonate solution that just covers the amount of fibers for 50 minutes. During the treatment, it is necessary to use ultrasonic waves for co-processing. The ultrasonic power is 50w, and it needs to be stirred once every 10 minutes. Aramid Chopped Fiber Wash and tumble dry. Obtain the pretreated para-aramid chopped fibers;

[0055] (3) Fiber surface modification: the para-aramid chopped fiber after the pretreatment obtained in step (2), and the para-aramid pulp fiber (purchased by DuPont) with a length of 5-6 mm are coupled wi...

Embodiment 3

[0063] (1) The equipment of pretreatment liquid: acetone is diluted into the solution that mass fraction is 50%, obtains pretreatment liquid, for subsequent use;

[0064] (2) Fiber pretreatment: the prepared pretreatment solution in step (1) is maintained at a temperature of 20-30°C, and the para-aramid chopped fibers (purchased by DuPont) with a length of 5-6mm are pretreated. Treatment, the pretreatment process is to treat the fiber with a 50% acetone solution that just covers the fiber amount for 30 minutes. During the treatment, it is necessary to use ultrasonic waves for synergistic treatment. The ultrasonic power is 50w, and it needs to be stirred every 10 minutes. Cut fiber wash and dry. Obtain the pretreated para-aramid chopped fibers;

[0065] (3) Fiber surface modification: the para-aramid chopped fiber after the pretreatment obtained in step (2), and the para-aramid pulp fiber (purchased by DuPont) with a length of 5-6 mm are coupled with Agent KH-570 for modifica...

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Abstract

The invention discloses a gradient-structure nanometer aramid paper making method. According to the making method, a pretreatment liquid is firstly prepared, the pretreatment liquid is used to pretreat a para-aramid chopped fiber, the pretreated aramid chopped fiber and a para-aramid pulp fiber are modified by a coupling agent or a coupling agent solution, paper is manufactured with pulp, a nanometer para-aramid fiber is used to strength the gradient structure of the paper, and the strength of the prepared nanometer aramid paper with the gradient structure is 10-25 times that of base paper. The method improves the defect of the aramid paper, and a product has the characteristics of high temperature resistance, flame retardance, excellent electrical insulation property, etc.

Description

technical field [0001] The invention relates to a method for manufacturing high-strength para-aramid paper, in particular to a novel method for reinforcing ordinary aramid paper with nano-aramid fibers so as to greatly improve its mechanical properties. Background technique [0002] As a new type of high-performance special material, aramid paper has gradually expanded its important applications in military and civilian fields in recent years. Although my country's aramid paper industry has achieved relatively rapid development in recent years and has been used in certain fields, the performance of the product, especially the mechanical properties, paper evenness, and electrical properties, is still insufficient. Technology is still missing, and there is a big gap with foreign countries. There are two types of aramid fibers: one is meta-aramid fibers with zigzag molecular chains, and the other is para-aramid fibers with linear molecular chains. Generally speaking, the high t...

Claims

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Application Information

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IPC IPC(8): D21H27/00D21H13/26D21H21/08D21C9/00
CPCD21C9/00D21C9/004D21H13/26D21H21/08D21H27/00
Inventor 刘德桃欧阳豪林美燕苏灵峰李映辉徐科
Owner SOUTH CHINA UNIV OF TECH
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