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Preparation method of mixed fiber system aramid paper

A technology of mixed fiber and aramid paper, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material treatment, papermaking, etc., and can solve problems such as fiber flocculation, poor paper formation, and poor paper strength , to achieve the effect of improving paper evenness, reducing the ratio and avoiding flocculation

Active Publication Date: 2014-01-01
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing aramid paper with a mixed fiber system, using the same fiber of different lengths to compound a mixed fiber system with different average lengths, which can not only give full play to the advantages of long fibers, but also reduce flocculation , improve the evenness of the paper, make the combination of fibers more tightly, improve the strength of the paper, and reduce the adverse effects of the addition of different fibers on the paper performance; solve the fiber flocculation in the existing process of preparing aramid fiber , Poor paper formation and poor paper strength

Method used

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[0030] A method for preparing an aramid paper of a mixed fiber system, comprising the following steps:

[0031] 1), the molar concentration will be 1.5×10 -3 -3.0×10 -3 mol / L sodium dodecylbenzene sulfonate solution, under the condition of 40-60 ℃, constant temperature treatment of two or more kinds of aramid chopped fibers of different lengths for 0.5h-1h, mixed according to different proportions to obtain mixed fiber system,

[0032] 2) Mix 30-50 parts by mass of the mixed fiber system in step 1) with 50-70 parts by mass of aramid pulp, and then disintegrate and disperse in the fiber dissociation machine; add 4-6mL of poly Ethylene oxide solution to obtain a mixed suspension of mixed fiber and aramid pulp, the sum of the mass parts of the mixed fiber system and aramid pulp is 100;

[0033] 3) Pour the mixed suspension into the sheet former for dehydration and forming, then wet press to remove excess water, and finally dry.

[0034] 4) The prepared aramid paper is subject...

Embodiment 1

[0036] A method for preparing aramid paper with mixed fiber system, comprising the following steps:

[0037] 1) Use aramid chopped fibers with a length of 3mm and 6mm at a molar concentration of 1.5×10 -3 The mol / L sodium dodecylbenzenesulfonate solution was soaked at 40°C for 0.5h;

[0038] 2) Mix the soaked aramid chopped fibers with a length of 3 mm and 6 mm in a ratio of 4:6 to obtain a mixed fiber system.

[0039] 3) Mix 30 parts by mass of the mixed fiber system with 70 parts by mass of aramid pulp, then disintegrate and disperse in a fiber dissociation machine, add 4mL of PEO (polyethylene oxide) solution during the dispersion process, and obtain a mixed suspension , the sum of the mass parts of the two raw materials is 100.

[0040] 4) Pour the mixed suspension into the sheet former for dehydration and forming, then wet press to remove excess water, and finally dry.

[0041] 5) The prepared aramid paper is subjected to high-temperature hot-pressing treatment on a ho...

Embodiment 2

[0043] A method for preparing aramid paper with mixed fiber system, comprising the following steps:

[0044] 1) Use aramid chopped fibers with a length of 4mm and 6mm at a molar concentration of 2.0×10 -3 The mol / L sodium dodecylbenzenesulfonate solution was soaked for 45min at 50°C;

[0045] 2) Mix the soaked aramid chopped fibers with a length of 4 mm and 6 mm in a ratio of 4:6 to obtain a mixed fiber system with an average length of 5 mm.

[0046] 3) Take 40 parts by mass of the mixed fiber system with an average length of 5mm and mix it with 60 parts by mass of aramid pulp, and then disintegrate and disperse in the fiber dissociation machine. During the dispersion process, 5 mL of PEO solution was added to obtain a mixed suspension, and the sum of the mass parts of the two raw materials was 100.

[0047] 4) Pour the mixed suspension into the sheet former for dehydration and forming, then wet press to remove excess water, and finally dry.

[0048] 5) The prepared aramid pa...

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Abstract

The invention discloses a preparation method of mixed fiber system aramid paper. The mixed fiber system aramid paper comprises the following components in parts by mass: (1) 30-50 parts of aramid chopped fiber with different average lengths, which is compounded by the aramid chopped fiber with the lengths of 3mm, 4mm, 5mm and 6mm; and (2) 50-70 parts of aramid pulp. The preparation method of the aramid paper comprises the following steps: (1) performing surface treatment on the aramid chopped fiber with the different lengths; (2) mixing the aramid chopped fiber with the different lengths according to different proportions to obtain a mixed aramid chopped fiber system; (3) mixing the aramid chopped fiber system with the aramid pulp; (4) preparing wet-formed aramid raw paper; and (5) performing hot-pressing on the aramid raw paper. The preparation method disclosed by the invention can solve the problems of fiber flocculation, poor evenness of the formed paper and poor paper strength in an existing aramid preparation process.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to an aramid paper with a fiber mixing system and a preparation method thereof. Background technique [0002] Aramid paper has excellent mechanical strength, thermal stability and good insulation performance. In recent years, with the development of technology, my country's aramid paper industry has made continuous progress, and some manufacturers have been able to produce aramid paper with better performance. [0003] Aramid fiber is a hydrophobic fiber. During the dispersion process of aramid paper pulp, the dispersion effect of aramid fiber in water is poor, and it is easy to flocculate, which affects the evenness and strength of paper. In the preparation and research process of aramid paper Improving the strength of paper is the focus of research. [0004] At present, most of the main methods of improving aramid paper are to improve the dispersion of aramid fibers or to mix aramid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21H15/10
Inventor 张素风孙召霞
Owner SHAANXI UNIV OF SCI & TECH
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