Aramid paper, manufacturing method therefor, and use thereof

A technology of aramid and polyamide paper, applied in papermaking, paper, special paper, etc., can solve the problems of poor base paper transfer performance, uneven strength, thermal expansion coefficient, electrical conductivity and thermal conductivity, etc. , to achieve the effect of improving mechanical properties, uniform electrical insulation properties, excellent paper strength and paper-forming properties

Active Publication Date: 2018-03-27
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, since the aramid paper produced according to the prior art contains a binder formed of thermoplastic fibers, inorganic fillers, etc. in addition to the aramid pulp or fibrids, it is difficult to obtain certain parameters such as thermal expansion coefficient, electrical conductivity, etc. There will be differences in the physical properties of rate and thermal conductivity
Therefore, it is not suitable for materials or components requiring precision
In addition, the problems of poor base paper transfer performance, uneven strength and aggregation between flocs cannot be solved

Method used

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  • Aramid paper, manufacturing method therefor, and use thereof
  • Aramid paper, manufacturing method therefor, and use thereof
  • Aramid paper, manufacturing method therefor, and use thereof

Examples

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preparation example Construction

[0045] The method for preparing aramid paper for honeycomb according to the present disclosure may include: a step of preparing aramid floc; a step of preparing aramid pulp; a step of mixing the aramid floe with the aramid pulp to prepare paper stock; and a step of forming the paper stock into base paper.

[0046] The length of the aramid floc may be 4 mm to 8 mm, the length of the aramid pulp may be 0.5 mm to 8 mm and the freeness may be 150 mL to 250 mL.

[0047] The wholly aromatic polyamide paper for electrical insulating paper according to the present disclosure may contain a mixture of aramid floe and aramid pulp containing 20% ​​by weight or more of fine powder.

[0048] The mixture may contain 20% to 40% by weight aramid floe and 60% to 80% by weight aramid pulp.

[0049] The length of the aramid floc may be 4 mm to 8 mm, the length of the aramid pulp may be 0.5 mm to 8 mm and the freeness may be 150 mL to 250 mL.

[0050] The method for preparing wholly aromatic pol...

preparation Embodiment 1

[0087] Preparation Example 1: Preparation of aramid floc

[0088] An aromatic diamine solution was prepared by dissolving 80 kg of calcium chloride and 48.67 kg of p-phenylenediamine in 1,000 kg of N-methyl-2-pyrrolidone maintained at 80°C. After the aromatic diamine solution and equimolar molten terephthaloyl chloride were added to the polymerization reactor, a poly(p-phenylene terephthalamide) polymer having an intrinsic viscosity of 6.8 was prepared by stirring.

[0089] Next, the prepared polymer was dissolved in 99% sulfuric acid to prepare an optically anisotropic spinning solution having a polymer content of 18% by weight. The prepared spinning solution is spun using a spinneret, and then coagulated in a coagulation bath through an air layer to prepare filaments. The filaments are washed with water, dried, and wound up using a winder. The poly(p-phenylene terephthalamide) filaments thus obtained were cut into predetermined lengths (3 mm, 6 mm and 9 mm) using a rotary...

preparation Embodiment 2

[0090] Preparation Example 2: Preparation of Aramid Pulp

[0091]A uniform slurry was prepared by dispersing 20 kg of the 6 mm long aramid floe prepared in Preparation Example 1 in 1,000 L of water. The prepared slurry was beaten for a predetermined time using a beater equipped with a refiner. The beating process is carried out while sampling to control the basic physical properties of the aramid pulp such as specific surface area (SSA), Canadian Standard Freeness (CSF), fiber length (FL), etc. After the beating process, the pulp is dewatered using a filter and then dried. The dried sheet was crushed into small pieces to prepare aramid pulp.

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Abstract

The present invention relates to an aramid paper for a honeycomb, which is manufactured by mixing, with aramid flock, aramid pulp having a fiber length equal to or longer than a predetermined length and a fibril developed at a level equal to or higher than a predetermined level, at a predetermined rate; wholly aromatic aramid paper for an electrical insulating sheet, the paper having excellent paper formation and thus having a uniform electrical insulation property, and being manufactured by mixing aramid pulp having fines, the content of which is equal to or more than a predetermined rate, ata predetermined rate; laminated aramid paper which has a uniform thermal expansion coefficient, uniform electrical conductivity, and uniform thermal conductivity, and is formed by laminating, throughcalendaring, aramid paper having excellent paper formation on aramid paper having excellent paper strength; and a method for manufacturing the same. The aramid paper according of the present invention can be applied to a material or a component, which requires precision and should have a little difference in a physical property, such as a thermal expansion coefficient, electrical conductivity, orthermal conductivity. More particularly, the aramid paper has excellent paper strength and excellent paper formation and thus can be applied to a honeycomb, an electrical insulating sheet, a PCB substrate, etc. Moreover, the method can remove poor transfer of base paper, non-uniformity of strength, and cohesion between flocks in manufacturing aramid paper.

Description

technical field [0001] The present disclosure relates to an aramid paper, its preparation method and its use. [0002] More specifically, the present disclosure relates to an aramid paper for honeycomb by mixing aramid flocs (floc) in a predetermined ratio, a fiber length equal to or greater than a predetermined Aramid pulp (pulp) having a length and a fibril development equal to or higher than a predetermined level is prepared. [0003] The present disclosure also relates to a wholly aromatic polyamide paper for electrical insulating paper, which has excellent paper-forming properties and thus uniform electrical insulating properties, and a method for preparing the same. Amide paper made by mixing aramid floc in a predetermined ratio, and aramid pulp with a fiber length equal to or shorter than a predetermined length, a fibril development equal to or higher than a predetermined level, and a fines content equal to or higher than a predetermined ratio to prepare. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26H01B3/52D21G1/00D21H27/30
CPCD21G1/00D21H13/26D21H27/30H01B3/52
Inventor 李泛薰
Owner KOLON IND INC
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