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Anti-yellowing meta-aramid fibrid and preparation method and application thereof

A technology of aramid fiber precipitation and anti-yellowing, which is applied in the field of polymers and can solve the problems of large loss of additives, fast settling speed, and low utilization efficiency, so as to achieve good combination, increase permittivity, and increase effective use rate Effect

Inactive Publication Date: 2021-01-08
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing technology, additives are added when the slurry is mixed in the papermaking process, the loss of additives is large, and the utilization rate is low
There are also additives added to the resin solution, but the additives are micron-sized inorganic particles, the compatibility in the resin is too poor, the mixing is uneven, the sedimentation speed is fast, and the loss is serious in the process of sedimentation fiber washing and papermaking. Extremely inefficient

Method used

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  • Anti-yellowing meta-aramid fibrid and preparation method and application thereof

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preparation example Construction

[0027] The preparation method of the meta-aramid filtrate fiber of a specific embodiment of the present invention comprises the following steps:

[0028] (1) Preparation of anti-yellowing additive: bismuth hydroxide, DMAc (dimethylacetamide), and silane coupling agent are formulated into a suspension, and the suspension is ground with a nano sand mill as an anti-yellowing Dosage spare.

[0029] Preferably, DMAc is 10 to 30 times the mass of bismuth hydroxide, more preferably 20 to 25 times. One or more of KH-550, KH-540, KH-551, KH-901, KH-791 is selected as the silane coupling agent, more preferably one or more of KH-550, KH-540, KH-551 . The silane coupling agent is 0.1-3% of the mass of bismuth hydroxide, more preferably 1-2.5%, more preferably 1.8-2.2%. The particle size of bismuth hydroxide after grinding is 0.1-10 μm, more preferably 0.5-2 μm. The average width of the precipitated fiber is 30-50 μm. If the particle size of bismuth hydroxide is too large, the adsorpti...

Embodiment 1

[0039] Dissolve a mol m-phenylenediamine in DMAc, gradually add b mol isophthaloyl chloride, then add c mol 1,3,5-benzenetricarboxylic acid chloride, and finally add d mol tetramethylpiperidinamine, where b +c=a, b:a=0.99, d:c=2, the meta-aramid resin solution is obtained, the inherent viscosity is controlled to be 1.7, and calcium hydroxide is added for neutralization, and the pH value of the resin solution at the end of neutralization is 7.2 , After neutralization, dilute the resin solution with DMAc to a kinematic viscosity of 1500mpa·s.

[0040]Weigh bismuth hydroxide according to 6% of the mass of the polymer in the resin solution, add DMAc 20 times the mass of bismuth hydroxide and silane coupling agent KH-550 with 1.5% mass of bismuth hydroxide, and stir to form a suspension. Grind the suspension with a nano-sand mill. After grinding, the particle size of bismuth hydroxide is 1 μm. The ground suspension is added to the resin solution as an anti-yellowing agent, stirred ...

Embodiment 2

[0044] Dissolve a mol m-phenylenediamine in DMAc, gradually add b mol isophthaloyl chloride, then add c mol 1,3,5-benzenetricarboxylic acid chloride, and finally add d mol tetramethylpiperidinamine, where b +c=a, b:a=0.99, d:c=2, the meta-aramid resin solution is obtained, the inherent viscosity is controlled to be 1.7, and calcium hydroxide is added for neutralization, and the pH value of the resin solution at the end of neutralization is 7.2 , After neutralization, dilute the resin solution with DMAc to a kinematic viscosity of 1500mpa·s.

[0045] Weigh bismuth hydroxide according to 6% of the mass of the polymer in the resin solution, add DMAc 20 times the mass of bismuth hydroxide and silane coupling agent KH-550 with 2% mass of bismuth hydroxide, and stir to form a suspension. Grind the suspension with a nano-sand mill. After grinding, the particle size of bismuth hydroxide is 1 μm. The ground suspension is added to the resin solution as an anti-yellowing agent, stirred a...

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Abstract

The invention discloses an anti-yellowing meta-aramid fibrid and a preparation method and application thereof. The preparation method comprises the following steps that isophthaloyl dichloride is gradually added into an m-phenylenediamine solution, then aryl ternary acyl chloride is added, finally tetramethyl piperidine amine is added for terminating, and a meta-aramid resin solution is obtained;after the meta-aramid resin solution is neutralized, an anti-yellowing agent is added, and stirring is carried out to obtain a precipitation resin stock solution; the anti-yellowing agent is preparedby grinding bismuth hydroxide and a silane coupling agent in a solvent; and precipitation molding is carried out on the precipitation resin stock solution, and washing is carried out to obtain the meta-aramid fibrid. Macromolecular chains of the fibrid prepared by the method are terminated by the tetramethyl piperidine amine, bismuth hydroxide is adhered to the surface of the fibrid and is well combined with the meta-aramid fibrid, and prepared aramid paper is bright in surface, uniform and compact and has excellent yellowing resistance, thermal oxidation resistance and insulating property.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and relates to a meta-aramid fibrid fiber and a preparation method thereof, more precisely, to an anti-yellowing meta-aramid fibrid fiber and a preparation method thereof. Background technique [0002] Meta-aramid fibrid fiber is one of the key materials for preparing meta-aramid paper. The fibrid fiber has a ribbon structure, which is light, thin, uniform in shape, and has a large specific surface area. The cut fibers are overlapped and evenly dispersed to fill the gaps in the network structure interwoven by the chopped fibers, so that the aramid paper exhibits high-strength mechanical properties. The base paper made of meta-aramid chopped fibers and precipitated fibers has a loose structure and needs to be heat-pressed to increase the tightness of the paper, form a dense structure, and improve the mechanical strength of the paper. However, the hot-pressing treatment causes more closed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/90D01F1/10D21H13/26D21H21/38C08G69/32
CPCD01F6/905D01F1/10D21H13/26D21H21/38C08G69/32
Inventor 刘含茂曹凯凯伍威易勇曹卓李忠良
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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