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High-dielectric para-aramid fiber paper and preparation method thereof

A technology of para-aramid paper and para-aramid, which is applied in pulp beating methods, circuits, papermaking, etc. It can solve the problems of inability to realize the high dielectric advantage of fibers, severe flocculation of aramid fibers, and lack of fiber bonding. Achieve the effects of increasing the speed and production efficiency of the paper machine, improving the evenness of the paper, and improving the mechanical strength

Inactive Publication Date: 2019-05-10
CHAMBROAD CHEM IND RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Para-aramid paper is generally prepared by wet papermaking process. Aramid fiber flocculates very strongly in water medium and is not easy to disperse, which will have a negative impact on the uniformity of paper and paper performance. Due to the rigid structure of the molecular chain of aramid nanofibers and the chemical inertness of the fiber surface, the fiber paper also lacks effective bonding between the fibers, resulting in many defects in the paper, and the high dielectric advantage of the fiber cannot be realized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The preparation method of para-aramid nanofiber is:

[0048] Under the protection of nitrogen, add the N-methylpyrrolidone that has been treated to remove water into the reaction vessel, add calcium chloride under stirring, the mass concentration of calcium chloride in the solvent is 5%, and heat to 90 ° C to make It dissolves, the heating time is 50min, and then the ice-water bath is cooled for 10min to 10°C, and the p-phenylenediamine is added to the reaction vessel. The molar concentration of p-phenylenediamine in the solvent is 0.4mol / L. After the p-phenylenediamine is dissolved Cool the reaction vessel to -10°C, add terephthaloyl chloride, the molar ratio of terephthaloyl chloride and p-phenylenediamine is 1.0:1, increase the stirring speed to 2000r / min, and continue the reaction; when the above reaction system appears After the gel phenomenon, stop stirring to obtain a jelly body; add N-methylpyrrolidone as a dispersant to the reaction system, and the amount of th...

Embodiment 1

[0050] Para-aramid chopped fibers (6mm in length), para-aramid pulp (40°SR), and para-aramid nanofibers (diameter 200-300nm) are 10% by mass: The ratio of 40%: 50% is used for slurry mixing, and the sum of the percentages of each component is 100%.

[0051] Mix the weighed raw materials into the slurry mixing tank, mix the slurry evenly and add water to adjust the slurry concentration to 0.05%, and add 0.5% of the absolute dry slurry (when the slurry does not contain any moisture) mass to the prepared slurry. PEO, silicone defoamer with 0.02% absolute dry pulp quality, after eliminating foam, carry out papermaking molding on inclined wire paper machine, press at 2MPa for 1min, dry at 150°C for 5min, under the conditions of 250°C and 120KN / m Hot pressing to obtain para-aramid finished paper.

[0052] The para-aramid paper prepared in Example 1 of the present invention is detected, and the detection standards are: GB T451.2-2002 "Determination of Quantitative Paper and Cardboar...

Embodiment 2

[0054] Para-aramid chopped fibers (6mm in length), para-aramid pulp (40°SR), and para-aramid nanofibers (diameter 200-300nm) are 20% by mass: 30%: 50% ratio for slurry mixing, the sum of the percentages of each component is 100%.

[0055] Mix the weighed raw materials into the slurry mixing tank, mix the slurry evenly and add water to adjust the slurry concentration to 0.05%, and add 0.5% of the absolute dry slurry (when the slurry does not contain any moisture) mass to the prepared slurry. PEO, silicone defoamer with 0.02% absolute dry pulp quality, after eliminating foam, carry out papermaking molding on inclined wire paper machine, press at 2MPa for 1min, dry at 150°C for 5min, under the conditions of 250°C and 120KN / m Hot pressing to obtain para-aramid finished paper.

[0056] According to the method of Example 1, the para-aramid paper prepared in Example 2 of the present invention was tested, and the test result was that the quantification of the para-aramid paper prepar...

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Abstract

The invention provides a preparation method of high-dielectric para-aramid fiber paper. The preparation method of the high-dielectric para-aramid fiber paper comprises the following steps: mixing para-aramid chopped fibers, para-aramid pulp and para-aramid nano fibers to obtain mixed pulp; and sequentially performing online forming, pressing, drying and calendaring forming on the mixed pulp to obtain the high-dielectric para-aramid fiber paper. According to the invention, the para-aramid nanofibers or the suspension slurry thereof are added, so that the para-aramid nanofibers, the para-aramidchopped fibers and the para-aramid pulp can be better used as a filling material to be combined with macroscopic fibers in a papermaking process, paper page gaps are filled, the combination of the fibers is enhanced, the paper page gaps are reduced, the combination of the fibers is compact after hot pressing, and various performance indexes of paper pages are improved while the paper forming uniformity is increased. The invention also provides the high-dielectric para-aramid fiber paper.

Description

technical field [0001] The invention relates to the technical field of para-aramid paper, in particular to a high-dielectric para-aramid paper and a preparation method 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, para-aramid has attracted more and more attention. Para-aramid fiber is prepared by papermaking process. Para-aramid paper has excellent dielectric properties, mechanical properties, high temperature resistance, chemical corrosion resistance and flexible designability, and is widely used in high-end insulation fields. Moreover, high-performance para-aramid paper-based composite materials obtained by combining aramid paper with other resins are also increasingly widely used in the field of materials. [0003] With the continuous development of the national economy, th...

Claims

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Application Information

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IPC IPC(8): D21H27/12D21H13/26D21H15/10D21D1/02D21C9/02D21F11/02
Inventor 董志荣马韵升刘振学郑亭路张云奎刘余田吴斌星于钧宇庄锐
Owner CHAMBROAD CHEM IND RES INST CO LTD
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