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Production method of meta-position aramid paper fibrid

A kind of technology of aramid fiber and production method, which is applied in fiber raw material processing, synthetic cellulose/non-cellulose material pulp/paper, paper making, etc. Problems and environmental pollution problems, high temperature resistance, high elastic modulus effect

Inactive Publication Date: 2014-11-19
SICHUAN YUNTONG CHEM IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Short fibers are cut from NOMEX filaments used in papermaking into 3-8 mm, and their main contribution is the mechanical strength of paper; precipitated fibers flow from NOMEX polymer solution through the nozzle into the high-speed rotating NOMEX precipitant, under strong shear force Under the action, the polymer disperses and solidifies into two-dimensional thin fiber flocs, which is the filling and bonding function between the short fibers in the NOMEX paper structure. Therefore, the shape and structure of the precipitated fibers have a great influence on the performance of the paper. Large, its manufacturing technology is rarely reported in the literature

Method used

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  • Production method of meta-position aramid paper fibrid

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Embodiment

[0034] 1. Under the condition of nitrogen protection, quantitatively add 235kg DMAC into the 300L glass-lined reaction pot, add accurately measured solid m-phenylenediamine 34.2kg under stirring, raise the temperature slightly, and keep warm and dissolve at 50~60℃ for 0.5h. Continue to pass nitrogen, cool the jacket with ice-salt water, and reduce the system temperature to 0-5°C in about 1-1.5 hours.

[0035] 2. Add 64.2~64.5kg of IPC (isophthaloyl chloride) dropwise into the pot under pressure with nitrogen, control the dropping flow rate at 0.8~1.2kg / min, and the temperature ≤ 65°C. After the addition was complete, the reaction was stirred for 1 h under the condition of continuing nitrogen flow and cooling.

[0036] 3. Stop the nitrogen flow, put the resin into the neutralization pot under stirring, add 240kg of DMAC to stir and clean the reaction pot, put it into the neutralization pot together, and slowly add the cleaning solution to the neutralization pot over 2 hours,...

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Abstract

The invention discloses a production method of a meta-position aramid paper fibrid. The production method comprises the following steps of: polymerizing m-phenylenediamine and isophthaloyl chloride in DMAC (M, N-dimethylacetamide) to form PMIA (polyisophthaloyl metaphenylene diamine) resin); producing hydrogen chloride gas by a neutralization reaction; diluting the resin, dispersing in a mother liquor and precipitating to obtain a fibrid suspending liquid in accordance with the manufacturing conditions of the meta-position aramid paper; pumping the fibrid suspending liquid and deionized water into a washing and filtering machine, and removing the solvent, additive and moisture containing in the fibrid to obtain the fibrid in accordance with the manufacturing conditions of the meta-position aramid paper. The method has advantages of low cost, high efficiency, stable process, simple used equipment and suitability for sustainable industrial production.

Description

technical field [0001] The invention relates to a production method of a special novel fiber product, in particular to a production method of a meta-aramid fibrous product. Background technique [0002] In the 1960s, DuPont used NOMEX precipitated fiber and NOMEX short fiber as papermaking raw materials, and produced NOMEX paper by inclined wire making and wet forming. It has high temperature resistance and excellent electrical insulation, and it has been fully utilized in high-performance insulating materials. , is a necessary material for new electrical equipment such as high-performance motors and dry-type transformers. In the past few decades, the aramid paper market has been almost monopolized by DuPont. Short fibers are cut from NOMEX filaments used in papermaking into 3-8 mm, and their main contribution is the mechanical strength of paper; precipitated fibers flow from NOMEX polymer solution through the nozzle into the high-speed rotating NOMEX precipitant, under str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/60C08G69/32D21H13/26
Inventor 尹斌李宗君
Owner SICHUAN YUNTONG CHEM IND CO LTD
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