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Amide aramid fiber paper, preparation method and application

A kind of aramid amide paper, aramid fiber technology, applied in papermaking, textile and papermaking, synthetic cellulose/non-cellulose material pulp/paper, etc. It is difficult to obtain the uniformity of paper and other problems, and achieve the effects of good chemical stability and adaptability, insensitivity to humid environment, and good wear resistance.

Active Publication Date: 2005-01-12
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent No. 93106746.4 proposes a "method for preparing highly air-permeable strong aramid paper", which proposes the use of 45-97% para-aramid fiber, 3-30% pulp, 0-35% quartz fiber to prepare an aramid paper suitable for the preparation of printed circuit board substrates; the Chinese invention patent No. 97102466.9 proposes a "full aromatic polyamide fiber sheet", this polyamide fiber The sheet comprises 70-90 parts by weight consisting of 5-30% (weight) of meta-position wholly aromatic polyamide short fibers and 70-95% (weight) of para-position wholly-aromatic polyamide short fibers and 4-30% by weight The Chinese invention patent that the patent No. is 99125156.3 has proposed a kind of " complete aramid fiber synthetic paper sheet ", and this synthetic paper sheet contains the aramid staple fiber of 70~96% by weight (contains 30% by weight or higher para-type aramid polyamide short fibers) and 4 to 30% by weight of the adhesive; the patent No. 00810718.1 Chinese invention patent proposes a "full aromatic polyamide paper and made from it Laminated board", this kind of fully aromatic polyamide paper is made of 60-97% para-aramid fiber and 3-40% meta-aramid pulp; the aforementioned patents basically use para-aramid Aramid fiber and binder are used to prepare aramid paper. The prepared aramid paper has good dimensional stability and insulation under high and low temperature and high humidity conditions, and is suitable for preparing printed circuit board substrates. However, due to the The elongation at break of para-aramid is only about 2.5%, while that of meta-aramid is as high as about 20%, and the degree of symmetry orientation and crystallinity of para-aramid is higher than that of meta-aramid. Internal rotation is difficult, and it is difficult to form hydrogen bonds. Because of these differences, the mechanical properties of aramid paper prepared by the above method are poor
Difficult to apply to other wider fields such as broadband wave-transmitting materials in aerospace, insulating materials for transformers and motors, etc.; in addition, there is an obvious problem to be overcome in the preparation of aramid paper using existing technologies, that is, It is difficult to disperse the aramid fiber in the water phase during the preparation process, because the molecular structure of the aramid amide is a rigid molecule, and the surface of the para-aramid fiber is more chemically inert, so it is difficult to disperse in the water medium, in order to obtain high For high-strength paper-based materials, aramid staple fibers must have sufficient length, which will make the fibers easy to flocculate and wind in the water medium, which will bring great difficulties to the material's copying and molding
It is difficult to obtain paper with better formation, which seriously affects the quality and use of aramid paper

Method used

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  • Amide aramid fiber paper, preparation method and application
  • Amide aramid fiber paper, preparation method and application
  • Amide aramid fiber paper, preparation method and application

Examples

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Effect test

Embodiment 1

[0025] Aramid paper was prepared by wet forming by mixing 20% ​​(weight percent) of aramid short fibers with 80% (weight percent) aramid pulp. The aramid staple fibers are meta-aramid amide fibers (domestic aramid 1313), and the staple fibers are 3.33 dtex and 9 mm in length. The aramid fiber pulp is the meta-aramid fiber amide pulp prepared by the precipitation method.

[0026] like figure 1 As shown in the process flow, the above-mentioned aramid staple fibers are dispersed in an aqueous solution with a beater, and 0.15% of octadecylamine (concentration in the aqueous solution) and 0.01% of cationic polyacrylamide (PAM) (in the aqueous solution) are added to the aqueous solution. concentration in aqueous solution) as a dispersing aid to obtain a uniformly dispersed suspension. The above-mentioned aramid fiber pulp was dispersed in an aqueous solution with a beating machine, and sodium carboxymethyl cellulose (CMC) 0.01% (concentration in the aqueous solution) was added to ...

Embodiment 2

[0030]Aramid paper was prepared by mixing 60% aramid short fibers (weight percent), 35% aramid fibrillated fibers (weight percent) and 5% aramid pulp by wet forming. The aramid short fibers are meta-aramid amide fibers (domestic aramid fibers 1313), and the short fibers are 3.33 dtex and 6 mm in length. The aramid fibrillated fibers are para-aramid amide fibers that have undergone fibrillation treatment. The aramid fiber pulp is the meta-aramid fiber amide pulp prepared by the precipitation method.

[0031] like figure 1 As shown in the technological process, the above-mentioned aramid fiber is dispersed in an aqueous solution with a beating machine, and sodium dodecylbenzenesulfonate 0.002% (concentration in the aqueous solution) is added to the aqueous solution as a dispersing aid to obtain a uniform dispersion. suspension. Disperse the above-mentioned fibrillated fibers in an aqueous solution with a beater, and add 0.002% sodium dodecylbenzenesulfonate (concentration in ...

Embodiment 3

[0035] Aramid paper is prepared by mixing 40% aramid short fibers (weight percentage), 20% aramid fibrillated fibers (weight percentage) and 40% aramid pulp by wet forming. The aramid short fibers are para-aramid amide fibers (domestic aramid fibers 1313), and the short fibers are 3.33 dtex and 6 mm in length. The aramid fibrillated fibers are para-aramid amide fibers that have undergone fibrillation treatment. The aramid fiber pulp is the meta-aramid fiber amide pulp prepared by the precipitation method.

[0036] like figure 1 As shown in the process flow, the above-mentioned aramid staple fibers are dispersed in an aqueous solution with a beater, and 0.15% of octadecylamine (concentration in the aqueous solution) and 0.01% of cationic polyacrylamide (PAM) (in the aqueous solution) are added to the aqueous solution. concentration in aqueous solution) as a dispersing aid to obtain a uniformly dispersed suspension. Disperse the above fibrillated fibers in an aqueous solution...

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Abstract

This invention provides a method for preparing PPTA amide paper including the following steps; adding 20-90% PPTA short fibers, 0-40% PPTA fibril chemical fibers, 1-80% PPTA pulp cakes and scattering aids to scatter them to get sizing materials to be formed on net to be de watered, squeezed and dried to be formed by thermal pressure. The proportion of said components is weight percentage. The paper can be used in structure materials, insulation materials of transformers or motors cellular, heat isolation, flame resistance, filtration and electronic materials.

Description

technical field [0001] The invention relates to papermaking technology, in particular to an aramid amide paper and a preparation method and application thereof. Background technique [0002] Aramid amide paper is made of aramid fiber and pulp according to papermaking technology, and then made by hot pressing, because it has strong and tough mechanical properties, excellent dielectric strength, good high temperature resistance, chemical stability and Adaptability and other advantages, it can be widely used in aerospace, transportation, electronics and other industries as structural materials, insulating materials, wave-transmitting and filtering materials. The Chinese invention patent No. 93106746.4 proposes a "method for preparing highly breathable strong aramid paper". This method proposes to use 45-97% para-aramid fiber, 3-30% pulp, 0-35% quartz fiber to prepare a kind of aramid paper suitable for the preparation of printed circuit board substr...

Claims

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Application Information

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IPC IPC(8): D21H13/26
Inventor 胡健王宜郑炽嵩周雪松詹怀宇
Owner SOUTH CHINA UNIV OF TECH
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