A method for preparing para-aramid fiber by spray method

A technology of para-aramid fiber and spray method, which is applied in the field of polymer material synthesis, can solve the problems of poor controllability of production process, inability to effectively control temperature, and affect product performance, etc., and achieve safe, controllable and efficient preparation of the production process , The effect of convenient and quick manufacturing

Active Publication Date: 2022-05-10
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polycondensation process is rapid and accompanied by severe heat release. The temperature difference between the inside and outside of the reactor is large in a low-temperature environment, and the stirring is uneven. The temperature cannot be effectively controlled, which makes the production process less safe and controllable, and increases energy consumption.
At the same time, as the reaction progresses, the product gradually precipitates to form a gel state, making it difficult to continue stirring, resulting in uneven reaction and ultimately affecting the performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get two 100mL reaction flasks and label them A and B respectively, vacuumize and fill with argon, add solvent nitrogen methyl pyrrolidone 100mL, p-phenylenediamine 0.6mol / L, cosolvent anhydrous calcium chloride (8wt% ), acid binding agent pyridine 1.2mol / L; add 100mL nitrogen methyl pyrrolidone and terephthaloyl chloride 0.62mol / L in B. Take two air-tight syringes marked 1 and 2 respectively, use the air-tight syringes 1 and 2 to extract the liquids in A and B respectively, take two syringe pumps respectively marked 1 and 2, and set the syringe pump A corresponding to the air-tight syringes The flow rates of B and B are 5ml / min and 5ml / min respectively, the spray gun is connected through a polytetrafluoroethylene pipe, and the other end of the spray gun is connected with argon gas. The caliber of the two spray guns is 0.5mm, the horizontal distance is 0.5m, and they face each other at a horizontal angle of 45°. The raw materials are sprayed with argon gas to form mist ...

Embodiment 2

[0029] Get two 100mL reaction flasks and label them A and B respectively, vacuumize and fill with argon, add solvent nitrogen methyl pyrrolidone 100mL to A, p-phenylenediamine 0.3mol / L, cosolvent anhydrous magnesium chloride (4wt%), Acid binding agent pyridine 3mol / L; add 100mL nitrogen methyl pyrrolidone and terephthaloyl chloride 0.31mol / L to B. Take two air-tight syringes marked 1 and 2 respectively, use the air-tight syringes 1 and 2 to extract the liquids in A and B respectively, take two syringe pumps respectively marked 1 and 2, and set the syringe pump A corresponding to the air-tight syringes The flow rates of B and B are 10ml / min and 10ml / min respectively, the spray gun is connected through a polytetrafluoroethylene pipe, and the other end of the spray gun is connected with argon gas. The caliber of the two spray guns is 1mm, the horizontal distance is 0.8m, and they face each other at a horizontal angle of 45°. The raw materials are sprayed with argon gas to form m...

Embodiment 3

[0031]Take two 100mL reaction flasks and label them A and B respectively, vacuumize and fill with argon, add solvent nitrogen ethyl pyrrolidone 100mL, p-phenylenediamine 0.1mol / L, cosolvent anhydrous lithium chloride (7wt% ), acid-binding agent pyridine 3mol / L; add 100mL nitrogen ethyl pyrrolidone and terephthaloyl chloride 0.1mol / L in B. Take two air-tight syringes marked 1 and 2 respectively, use the air-tight syringes 1 and 2 to extract the liquids in A and B respectively, take two syringe pumps respectively marked 1 and 2, and set the syringe pump A corresponding to the air-tight syringes The flow rates of B and B are 20ml / min and 20ml / min respectively, the spray gun is connected through a polytetrafluoroethylene pipe, and the other end of the spray gun is connected with argon gas. The caliber of the two spray guns is 1.5mm, the horizontal distance is 3m, and they face each other at a horizontal angle of 60°. The raw materials are sprayed with argon gas to form mist clust...

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Abstract

The invention discloses a method for preparing para-aramid fibers by spraying method. By using p-phenylenediamine and terephthaloyl chloride as monomers and nitrogen methyl pyrrolidone as solvents, the monomers are dissolved in an inert gas environment. The dispersed phase is formed through spray gun atomization, and the mist clusters collide to quickly undergo polycondensation reaction, and the product is directly sprayed on the material panel, and after high-temperature drying, an aramid coating is formed in one step. During the reaction process, the atomization state is used to increase the contact specific surface area of ​​the reactants, so as to realize the rapid removal of reaction heat and improve the process safety. The invention realizes rapid removal of reaction heat in the aramid fiber polymerization process, the production process is safe and controllable, and the thermal insulation coating material can be manufactured more efficiently.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis, and relates to a method for preparing para-aramid by spraying. Background technique [0002] Poly-p-phenylene terephthalamide, also known as p-aramid, is produced by polycondensation of terephthaloyl chloride and p-phenylenediamine. The reaction occurs rapidly, which easily leads to implosion and releases a large amount of reaction heat, which improves the Hazard factor increases production cost. Because of its excellent mechanical properties, thermal properties and chemical resistance, aramid fibers are widely used in various aspects of the national economy such as aerospace, electromechanical, construction, automobiles, and sporting goods in addition to military applications. The production process was first invented by DuPont, and the current production capacity is mainly concentrated in Japan and the United States. Among them, the annual production capacity of DuPont in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/32C08G69/28C09D177/10
CPCC08G69/32C08G69/28C09D177/10
Inventor 郭凯金钊刘一寰朱宁胡欣方正孙戒段金电邱江凯胡玉静赵双飞杨继明马灿亮
Owner NANJING TECH UNIV
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