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Long carbon chain condensed ring semi-aromatic nylon and synthetic process thereof

A synthetic process and semi-aromatic technology, applied in the field of nylon and its synthesis, to achieve the effects of cost reduction, abundant raw material sources, excellent toughness and weather resistance

Active Publication Date: 2008-10-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct melt polymerization cannot directly synthesize polymers with higher molecular weights in the synthesis of semi-aromatic nylon.

Method used

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  • Long carbon chain condensed ring semi-aromatic nylon and synthetic process thereof
  • Long carbon chain condensed ring semi-aromatic nylon and synthetic process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Accurately weigh a total of 150g of 2,6-naphthalene dicarboxylic acid and 1,12-dodecadiamine with a molar ratio of 1:1, add it to 1600ml of distilled water, and keep the water temperature at 80°C under conditions of stirring The reaction was carried out at low temperature for 4 hours, and then 1,12-dodecadiamine was added to adjust the pH of the aqueous solution to 7.0. After the pH value stabilized, the reaction was continued at constant temperature for 1.5 hours. The system was cooled at 5°C for 2 hours, and the precipitate was filtered and dried to obtain PA12N nylon salt with a melting point of 259°C.

[0023] The second step: make the PA12N nylon salt obtained in the first step into a 75% aqueous solution, put it in a 1500ml polymerization reaction kettle, replace the air in the kettle with carbon dioxide gas, and keep the carbon dioxide at a pressure of 0.2MPa as a protective gas . The reaction kettle was heated slowly, heated to 226°C within 2.5 hours, a...

Embodiment 2

[0028] Step 1: Accurately weigh a total of 100g of 2,6-naphthalene dicarboxylic acid and 1,12-dodecadiamine with a molar ratio of 1:0.96, add it to 1200ml of distilled water, and keep the water temperature at 65°C under conditions of stirring React at low temperature for 2 hours, add 1,12-dodecadiamine to adjust the pH of the aqueous solution to 7.2, and continue the reaction at a constant temperature for 2 hours after the pH value is stable, and cool the system at 9°C for 3 hours to remove the precipitate The product is filtered and dried to obtain PA12N nylon salt, the melting point of which is 259°C.

[0029] The second step: make the PA12N nylon salt obtained in the first step into a 60% aqueous solution, put it in a 1500ml polymerization reaction kettle, replace the air in the kettle with carbon dioxide gas, and keep the carbon dioxide at a pressure of 0.1MPa as a protective gas . The reaction kettle was heated slowly to 220°C within 2 hours, the pressure was maintained ...

Embodiment 3

[0032] Step 1: Accurately weigh a total of 200g of 2,6-naphthalene dicarboxylic acid and 1,12-dodecandiamine with a molar ratio of 1:1.02, add it to 2000ml of distilled water, and keep the water temperature at 95°C with stirring React at low temperature for 5 hours, add 1,12-dodecadiamine to adjust the pH of the aqueous solution to 7.5, and continue the reaction at a constant temperature for 3 hours after the pH value is stable, and then cool the system at 0°C for 2 hours. The precipitate is filtered and dried to obtain PA12N nylon salt with a melting point of 259°C.

[0033] The second step: make the PA12N nylon salt obtained in the first step into an 85% aqueous solution, put it in a 1500ml polymerization reaction kettle, replace the air in the kettle with carbon dioxide gas, and keep 0.4MPa carbon dioxide as a protective gas. The reaction kettle was heated slowly, heated to 250°C within 3 hours, the pressure was kept at 2.0MPa, and maintained at this state for 2 hours, then...

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Abstract

The invention discloses a novel long carbon chain fused ring semi-aromatic nylon PA12N and a method for synthesizing the same. The structural formula is as shown, wherein, n is equal to 2 to 200. The novel long carbon chain fused ring semi-aromatic nylon PA12N takes the long carbon chain aliphatic diamine 1, 12-twelve carbon diamine and fused ring aromatic serials dibasic acid 2,6-naphthalenedicarboxylic acid as raw materials and is made by the processes of salifying, prepolymerizing and polymerizing after solid phase. The technique has low energy consumption and protects the environment; the PA12N produced by the technique has good performance and is easy to process to form; and the technique has good market potential particularly in the industries such as electronics, appliances and automobiles.

Description

technical field [0001] The invention relates to nylon and a synthesis method thereof, in particular to a long carbon chain condensed ring semi-aromatic nylon PA12N and a synthesis method thereof. Background technique [0002] Semi-aromatic nylon is obtained by polycondensation of aliphatic diamine or diacid and diacid or diamine with aromatic ring, and is a kind of aromatic nylon. Due to the introduction of the aromatic ring structure into the main chain of the nylon molecule, the heat resistance and mechanical properties of the nylon product have been improved, and the water absorption rate has also been reduced to varying degrees, and it has a better cost performance. It is between the general engineering plastic nylon and the resistant High heat resistance resin between high temperature engineering plastics PEEK, mainly used in automobile and electrical and electronic industries. According to product performance requirements, various manufacturers have developed various ...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/30
Inventor 赵清香刘民英杨韶辉王玉东付鹏
Owner ZHENGZHOU UNIV
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