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Preparation method of modified PPTA with fluorescent effect

A kind of effect and modification technology, applied in the field of preparation of modified PPTA, can solve the problems of being only soluble in concentrated sulfuric acid, difficult processing, high equipment requirements, etc., achieve good application prospects and improve solubility performance

Active Publication Date: 2017-05-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the regular arrangement and high symmetry of the molecular structure of PPTA, and the existence of strong hydrogen bonds between the molecular chains, the molecular chains are elongated into a rigid rod-like structure, which is insoluble in water and general organic solvents, and can only be dissolved in concentrated in sulfuric acid
This feature leads to high requirements for equipment in the production process of PPTA, and the processing is very difficult

Method used

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  • Preparation method of modified PPTA with fluorescent effect
  • Preparation method of modified PPTA with fluorescent effect
  • Preparation method of modified PPTA with fluorescent effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Under nitrogen protection conditions, add 57mL of N-methylpyrrolidone (NMP) and 0.912g of LiCl to the three-necked flask, mechanically stir and dissolve at room temperature, and make a LiCl / NMP solution with a mass concentration of 16g / L; After dissolving, add 1.944g of powdered p-phenylenediamine (PDA) and 0.316g of 1,5-naphthalene diamine under stirring condition, until they are completely dissolved, cool to -10°C with a constant temperature condensing ethanol bath, and divide Add terephthaloyl chloride (TPC) twice, half of the total amount is added each time, and the added amount is 4.06406g in total. Immediately increase the speed to 500-3000r / min, and immediately add 1.5mL of acid absorbent pyridine (the concentration of pyridine is 26ml / L), remove the constant temperature condensing ethanol bath after the rod climbing phenomenon occurs after 30 minutes of reaction, and continue to react for two hours at room temperature. After standing still, filter with suction, ...

Embodiment 2

[0033] Under nitrogen protection conditions, add 57mL of N-methylpyrrolidone (NMP) and 0.912g of LiCl to the three-necked flask, mechanically stir and dissolve at room temperature, and make a LiCl / NMP solution with a mass concentration of 16g / L; After dissolving, add 1.728g of powdered p-phenylenediamine (PDA) and 0.632g of 1,5-naphthalenediamine under stirring condition, until they are completely dissolved, cool to -10°C with a constant temperature condensing ethanol bath, and divide Add terephthaloyl chloride (TPC) twice, the total amount added is 4.06406g, immediately increase the speed to 500-3000r / min, immediately add 1.5mL of acid absorbent pyridine (concentration of pyridine is 26ml / L), and react for 30min. After the rod climbing phenomenon, the constant temperature condensing ethanol bath was removed, and the reaction was continued for two hours at room temperature. After standing still, filter with suction, wash the precipitate with water and ethanol several times unt...

Embodiment 3

[0035] Under nitrogen protection conditions, add 57mL of N-methylpyrrolidone (NMP) and 0.912g of LiCl to the three-necked flask, mechanically stir and dissolve at room temperature, and make a LiCl / NMP solution with a mass concentration of 16g / L; After dissolving, add 1.512g of powdered p-phenylenediamine (PDA) and 0.948g of 1,5-naphthalene diamine under stirring condition, until they are completely dissolved, cool to -10°C with a constant temperature condensing ethanol bath, and divide Add terephthaloyl chloride (TPC) twice, the total amount added is 4.06406g, immediately increase the speed to 500-3000r / min, immediately add 1.5mL of acid absorbent pyridine (concentration of pyridine is 26ml / L), and react for 30min. After the rod climbing phenomenon, the constant temperature condensing ethanol bath was removed, and the reaction was continued for two hours at room temperature. After standing still, filter with suction, wash the precipitate with water and ethanol several times un...

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Abstract

The invention relates to a polymerization method of modified PPTA with a fluorescent effect. The polymerization method comprises the following steps: adding PDA (P-phenylene Diamine) and 1,5-DAN (Diaminonaphthalene) in an LiCl solution, and cooling after completely dissolving; then adding TPC (Terephthaloyl Chloride) twice, and immediately quickening the rotating speed to 500 to 3000 r / min; then adding an acid adsorbent for reacting for 20 to 40 minutes; removing a cooling device after a pole climbing phenomenon appears; continuously reacting for 2 to 3 hours under a room temperature state; carrying out after-treatment, thus obtaining the modified PPTA. With the introduction of the fluorescent monomer 1,5-DAN, the modified PPTA is enabled to have the fluorescent effect, and the application of the PPTA in aspects of fluorescent falsification prevention and fluorescent detection is expected to be expanded.

Description

technical field [0001] The invention belongs to the field of preparation of fluorescent materials, in particular to a preparation method of modified PPTA with fluorescent effect. Background technique [0002] Aramid fiber, carbon fiber and polyethylene fiber are three high-performance fibers widely used at home and abroad, and have important uses in fiber-based composite materials. In order to distinguish it from aliphatic polyamides, the U.S. Government Trade and Industry Commission named aromatic polyamides as Aramid, which refers to a linear high-density polyamide with at least 85% of the amide bonds (-CONH-) in the molecular chain directly connected to two aromatic rings. Molecule, the fiber produced by it is aramid fiber, that is, aramid fiber PPTA, also called Aramid fiber. PPTA fiber is a new type of high-tech synthetic fiber. It has excellent properties such as ultra-high strength, high modulus, high temperature resistance, light specific gravity, and chemical corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32C09K11/06
CPCC08G69/32C09K11/06C09K2211/14
Inventor 廖耀祖李佳欢秦明林余木火
Owner DONGHUA UNIV
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