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Para-aramid paper reinforced by para-aramid and meta-aramid copolymerized fibrid and preparation process of para-aramid pape

A technology of para-aramid paper and precipitating fiber, which is applied in the directions of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc. and other problems, to achieve the effect of improving paper evenness and physical strength, increasing bonding strength, and large specific surface area

Pending Publication Date: 2021-07-02
山东聚芳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the honeycomb prepared by pure para-aramid paper is very good, the preparation method is difficult
And because of its linear molecular rigid structure, the formed aramid paper has no glass transition phenomenon in the hot pressing process, and is only bonded by physical action, the intermolecular force is relatively weak, and the internal bonding strength is much lower than that of meta-aramid fiber. Paper is prone to problems such as breakpoints in the downstream honeycomb preparation process, and the production of pure para-aramid paper is difficult and costly, and the honeycomb products made are difficult to process
[0005] In addition, there is another process that uses meta-aramid precipitated fiber and para-aramid short fiber to prepare para-aramid paper. Since this process introduces meta-aramid, meta-aramid cannot be uniformly mixed with para-aramid Compared with meta-aramid fiber, the strength of its product is significantly lower than that of meta-aramid paper, and its elastic modulus is significantly lower than that of para-aramid paper.

Method used

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  • Para-aramid paper reinforced by para-aramid and meta-aramid copolymerized fibrid and preparation process of para-aramid pape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Preparation of para-aramid chopped fiber slurry: the volume-molar concentration of 5mm para-aramid chopped fiber is 1.2×10 -3 mol / L, sodium dodecylbenzenesulfonate aqueous solution at a temperature of 60°C for washing and pretreatment, and then washed with water, and then deflagged by a deflagging machine with a concentration of 0.01% to make para-aramid short Cut fiber pulp.

[0071] (2) Preparation of para-aramid nanofiber slurry: add the purchased gel-like para-aramid nanofibers into a beater for beating, the beating concentration is controlled at 0.1%, and the beating degree is controlled at 70°SR.

[0072] (3) Preparation of para-position meta-aramid copolymerized precipitated fiber slurry: the strip-shaped para-positioned meta-aramid copolymerized precipitated fiber is subjected to beating treatment, the degree of beating is controlled at 40 ° SR, and the beating concentration is 0.1%, and the para-position Meta-aramid copolymerized fibrous slurry.

[0073] ...

Embodiment 2

[0081] (1) Preparation of para-aramid chopped fiber slurry: the volume-molar concentration of 5mm para-aramid chopped fiber is 1.2×10 -3 mol / L, sodium dodecylbenzenesulfonate aqueous solution at a temperature of 60°C for washing and pretreatment, then washed with water, and then deflagged by a deflagging machine, with a concentration of 0.03% to make para-aramid short Cut fiber pulp.

[0082] (2) Preparation of para-aramid nanofiber slurry: add the purchased strip-shaped para-aramid nanofibers into a beater for beating, the beating concentration is controlled at 0.3%, and the beating degree is controlled at 80°SR.

[0083] (3) Preparation of para-position meta-aramid copolymerized precipitated fiber slurry: the strip-shaped para-positioned meta-aramid copolymerized precipitated fiber is subjected to beating treatment, the degree of beating is controlled at 55 ° SR, and the beating concentration is 0.5%, and the para-position Meta-aramid copolymerized fibrous slurry.

[0084]...

Embodiment 3

[0092] (1) Preparation of para-aramid chopped fiber slurry: the volume-molar concentration of 5mm para-aramid chopped fiber is 1.2×10 -3 mol / L, sodium dodecylbenzenesulfonate aqueous solution at a temperature of 60°C for washing and pretreatment, and then washed with water, and then deflagged by a deflagging machine with a concentration of 0.05% to make para-aramid short Cut fiber pulp.

[0093] (2) Preparation of para-aramid nanofiber slurry: add the purchased gel-like or ribbon-shaped para-aramid nanofibers into a beater for beating, the beating concentration is controlled at 0.8%, and the beating degree is controlled at 90°SR.

[0094] (3) Preparation of para-position meta-aramid copolymerized precipitated fiber slurry: the strip-shaped para-positioned meta-aramid copolymerized precipitated fiber is subjected to beating treatment, the degree of beating is controlled at 70 ° SR, and the beating concentration is 1.0%, and the para-position Meta-aramid copolymerized fibrous s...

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Abstract

The invention belongs to the technical field of papermaking, and particularly relates to para-aramid paper reinforced by para-aramid and meta-aramid copolymerized fibrid and a preparation process of the para-aramid paper. On the basis of para-aramid chopped fibers and para-aramid nanofibers, para-aramid and meta-aramid copolymerized fibrid is added to replace meta-aramid fibrid in the prior art, and the proportion of the raw materials is adjusted. The para-aramid and meta-aramid copolymerized fibrid contains a small amount of meta-aramid components, so that the para-aramid and meta-aramid copolymerized fibrid not only can reach considerable strength, but also can ensure enough elastic modulus. The para-aramid paper is especially suitable for manufacturing downstream product honeycomb core materials, and the performance is outstanding.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a para-aramid fiber-reinforced para-aramid paper and a preparation process thereof. Background technique [0002] In recent years, the research and application of high-performance materials have developed rapidly. As a new type of synthetic fiber material with high strength, high modulus and high temperature resistance, aramid has attracted more and more attention. Aramid paper prepared from aramid fiber through papermaking process has excellent dielectric properties, mechanical properties, high temperature resistance, chemical corrosion resistance and flexible designability, and is widely used in high-end insulation, aerospace, rail transit, etc. It is the key material to achieve ultra-high-grade insulation, light weight and high speed. High-performance aramid paper-based composite materials obtained by combining aramid paper with other resins are also increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26
CPCD21H13/26
Inventor 董志荣郑亭路庄锐张云奎姚坤承高立花周鹏飞刘焕良孟军
Owner 山东聚芳新材料股份有限公司