A kind of synthetic method of fully aromatic polyamide

A fully aromatic and synthetic method technology, applied in the field of synthesis of fully aromatic polyamides, can solve the problems of loss of mechanical properties of materials, reduce the degree of close packing of molecular chains and molecular chains, and achieve regular molecular chains and avoid mechanical properties. Decrease and avoid the effect of mechanical property decline

Active Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of the third and fourth monomers also reduces the rigidity of the molecular chain and the degree of tight packing of the molecular chain, resulting in the loss of the mechanical properties of the material.

Method used

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  • A kind of synthetic method of fully aromatic polyamide
  • A kind of synthetic method of fully aromatic polyamide
  • A kind of synthetic method of fully aromatic polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 18.1g (0.1mol) of 5-aminoisophthalic acid, 10.8g (0.11mol) of maleic anhydride, 20mL of dehydrating agent acetic anhydride and 20mmol of catalyst anhydrous sodium acetate into 150mL of acetone solvent, and stir to dissolve the material. Then, the mixed solution was put into the premixing tank of the impinging flow reactor and mixed. The solution is input to the feed port of the impinging flow reactor through the pump, and the liquid flow flows to the center surface of the container through the guide tube at a high speed under the pressure, and reacts with a frontal collision at the center. The reaction temperature is controlled at 55°C, and the system The internal pressure is 0.3MPa, and the impacted liquid material flows back to the premixing tank from the outlets on both sides, and then is pumped to the feed port of the impacting flow reactor for reaction to realize continuous reaction, and the reaction time is 50 minutes. After the reaction is finished, cool the ...

Embodiment 2

[0036] The method for preparing polymeric monomer 5-maleimide isophthalic acid is the same as Example 1.

[0037] Add 15g of solubilizing anhydrous lithium chloride to the mixed solvent of triphenyl phosphite (500ml) / pyridine (500ml) / N,N-dimethylacetamide (250ml), gradually raise the temperature and stir to 50°C, wait After lithium chloride was completely dissolved, 26.1 g (0.1 mol) of 5-maleimidoisophthalic acid and 20 g (0.1 mol) of 4,4′-diaminodiphenyl ether were added. The temperature was raised to 90° C. under stirring condition, and the reaction was carried out for 5 hours. After the reaction system was cooled to room temperature, the reaction solution was poured into excess methanol, and a precipitate was formed under stirring conditions. The precipitated product was filtered with suction, washed with methanol, and dried in a vacuum oven at 150°C for 24 hours to obtain a fully aromatic polyamide product 38.7 g, the yield is 83.8%. The prepared aromatic polyamide (mole...

Embodiment 3

[0041] Add 18.1g (0.1mol) of 5-aminoisophthalic acid, 10.8g (0.11mol) of maleic anhydride, 20mL of dehydrating agent acetic anhydride and 10mmol of catalyst triethylamine into 150mL of pyridine solvent, and stir to dissolve the material. Then, the mixed solution was put into the premixing tank of the impinging flow reactor and mixed. The solution is input to the feed port of the impingement flow reactor through the pump, and the liquid flow flows to the center surface of the container through the guide tube at a high speed under the pressure, and reacts with a frontal impact at the center. The reaction temperature is controlled at 65°C, and the system The internal pressure is 1.5MPa, and the impacted liquid material flows back to the premixing tank from the outlets on both sides, and then is pumped to the feed port of the impacting flow reactor for reaction to realize continuous reaction, and the reaction time is 60 minutes. After the reaction is finished, cool the reaction li...

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Abstract

The invention discloses a method for synthesizing a wholly aromatic polyamide, which comprises the following contents: (1) synthesizing a polymerization monomer 5-maleimide terephthalic acid; (2) converting the mass fraction to 0.5~ 6.0% of the solubilizer is completely dissolved in the organic solvent, and the 5-maleimide-based isophthalic acid and aromatic diamine synthesized in equimolar ratio step (1) are added for homopolymerization reaction, after cooling , precipitation, washing and drying to obtain a fully aromatic polyamide product. The fully aromatic polyamide synthesized by homopolymerization in the present invention can effectively improve the solubility of the polymer in organic solvents, which is beneficial to dissolving aromatic polyamide in organic solvents for spinning and other processing techniques, and the fully aromatic polyamide prepared at the same time The molecular chain of aromatic polyamide is regular and rigid, which avoids the decline of mechanical properties and expands the application field of fully aromatic polyamide.

Description

technical field [0001] The invention relates to a method for synthesizing fully aromatic polyamides. Background technique [0002] Para-aramid fiber, that is, Poly (para-phenylene terephthalamide), referred to as PPTA fiber, is called aramid fiber 1414 in my country, and the product name of DuPont in the United States is Kevlar. Due to the high symmetry, regularity and rigid structure of the PPTA fiber molecular chain, it has excellent mechanical properties such as high strength and high modulus, low density, high dimensional stability, high temperature resistance, and good affinity with rubber. Therefore, aramid fibers can be widely used in the information industry, civil engineering, sealing packing, structural materials for large passenger aircraft, and flame-resistant and heat-resistant protective clothing. At present, aramid products are mainly used in body armor and helmets, accounting for about 7%~8%, aerospace materials and sports materials account for about 40%, ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/32C08G69/28C07D207/452
Inventor 李澜鹏白富栋王艳张全乔凯王领民
Owner CHINA PETROLEUM & CHEM CORP
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