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Synthesis method of wholly aromatic polyamide

A wholly aromatic and synthetic method technology, applied in the field of synthesis of wholly aromatic polyamides, can solve the problems of loss of mechanical properties of materials, reduce the degree of tight packing of molecular chains, and achieve regularity of molecular chains and avoid mechanical properties. The effect of falling and high rigidity

Active Publication Date: 2015-04-29
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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  • Synthesis method of wholly aromatic polyamide
  • Synthesis method of wholly aromatic polyamide
  • Synthesis method of wholly 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 r...

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 synthesis method of wholly aromatic polyamide. The synthesis method of the wholly aromatic polyamide comprises the following steps: (1) synthesizing a polymeric monomer 5-cis-butene imidodicarbonic diamide terephthalic acid; and (2) completely dissolving a chaotropic agent with the mass fraction of 0.5-6.0% in an organic solvent, adding 5-cis-butene imidodicarbonic diamide isophthalic acid synthesized in the step (1) and aromatic diamine in an equal molar ratio, cooling, precipitating, washing and drying, thus obtaining the wholly aromatic polyamide product. The synthesis method of the wholly aromatic polyamide has the advantages that the wholly aromatic polyamide synthesized through homopolymerization can be used for effectively improving solubility of a polymer in an organic solvent, so that the aromatic polyamide can be conveniently dissolved into the organic solvent for carrying out a spinning processing technique and the like; meanwhile, the prepared wholly aromatic polyamide is regular in a molecular chain and high in rigidity, so that mechanical properties can be not reduced, and the application field of the wholly aromatic polyamide is expanded.

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 Applications(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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