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A kind of copolymerized aromatic-aliphatic semi-aromatic nylon and its preparation method

A semi-aromatic nylon and aliphatic technology, which is applied in the preparation field of copolymerized aromatic-aliphatic semi-aromatic nylon, can solve the problems of insufficient understanding of semi-aromatic nylon, and achieve good market application prospects, excellent toughness and weather resistance, and good application foreground effect

Active Publication Date: 2022-03-08
CHINA RESOURCES PACKAGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the monopolistic operation of chemical giants, the domestic understanding of semi-aromatic nylon is insufficient, and only foreign modified semi-aromatic nylon can be used, and it is impossible to use semi-aromatic nylon materials for modification.

Method used

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  • A kind of copolymerized aromatic-aliphatic semi-aromatic nylon and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0054] Step 1: Accurately weigh 100 g of xylylenediamine raw material and aliphatic diacid raw material with a molar ratio of 1:1. Wherein, the xylylenediamine raw material comprises p-xylylenediamine and m-xylylenediamine, and the mol ratio of p-xylylenediamine and m-xylylenediamine is 50:50, and the raw material of aliphatic diacid is adipic acid. Under an inert atmosphere, add the above-mentioned raw materials into an autoclave equipped with 300ml of distilled water, react for 4 hours under the condition of stirring at a water temperature of 80°C, and then add p-xylylenediamine to adjust the pH of the aqueous solution to 7.0 according to the neutralization reaction , after the pH value was stabilized, the stirring reaction was continued at constant temperature for 1.5 hours to obtain a nylon salt aqueous solution system.

[0055] Step 2, transfer the nylon salt aqueous solution obtained in step 1 to a 500ml polymerization reactor, add 0.1g of phosphorous acid, replace the a...

Embodiment 2

[0058] Step 1: Accurately weigh 100 g of xylylenediamine raw material and aliphatic diacid raw material with a molar ratio of 1:1. Wherein, the xylylenediamine raw material includes p-xylylenediamine and m-xylylenediamine, the molar ratio of p-xylylenediamine and m-xylylenediamine is 50:50, and the aliphatic diacid is dodecanoic acid, adding In 400ml of distilled water, react for 4 hours at a water temperature of 80°C with stirring, then add m-xylylenediamine to adjust the pH of the aqueous solution to 7.0 according to the neutralization reaction, and continue the reaction at a constant temperature for 2 hours after the pH value is stable. A nylon salt aqueous solution system is obtained.

[0059] Step 2: Transfer the nylon salt aqueous solution obtained in step 1 to a 1L polymerization reactor, add 0.1 g of phosphorous acid, replace the air in the polymerization reactor with nitrogen, and keep nitrogen at a pressure of 0.2 MPa as a protective gas. Slowly heat the reactor, us...

Embodiment 3

[0062] Step 1: Accurately weigh 100 g of xylylenediamine raw material and aliphatic diacid raw material with a molar ratio of 1:1. Among them, xylylenediamine raw materials include p-xylylenediamine and m-xylylenediamine, the molar ratio of p-xylylenediamine and m-xylylenediamine is 50:50, the aliphatic diacid is sebacic acid, add 400ml In distilled water, react for 4 hours at a water temperature of 80°C with stirring, then add m-xylylenediamine to adjust the pH of the aqueous solution to 7.2 according to the neutralization reaction, and continue the reaction at a constant temperature for 2 hours after the pH value stabilizes to obtain Nylon saline solution system.

[0063] Step 2, transfer the nylon salt aqueous solution obtained in step 1 to a 500mL polymerization reactor, and add 0.1g of phosphoric acid, replace the air in the polymerization reactor with nitrogen, and keep nitrogen at a pressure of 0.2MPa as a protective gas. Slowly heat the polymerization reactor, use 2.5...

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Abstract

The present invention relates to a preparation method of copolymerized aromatic-aliphatic semi-aromatic nylon, which comprises the following steps: step 1, under the protection of inert gas, add equimolar aromatic diamine, aliphatic diacid and a certain amount of water In an autoclave, stir and react at a temperature T1 to obtain a nylon salt aqueous solution system; step 2, within a certain time t1, slowly heat up the nylon salt aqueous solution system to T2; under constant pressure / temperature P1 / T2, stir , polymerization reaction time t2; continue to stir and heat up to T3, this process is exhausted to maintain the pressure P1, time t3, gradually reduce the pressure to P2, and prepare a semi-aromatic nylon prepolymer with a set intrinsic viscosity; step 3 , crushing the semi-aromatic nylon prepolymer in step 2 into particles with a set particle size, drying under reduced pressure, and then performing polycondensation to obtain a semi-aromatic nylon with good high temperature resistance, impact resistance and high barrier performance.

Description

technical field [0001] The invention relates to a preparation method of copolymerized aromatic-aliphatic semi-aromatic nylon and the copolymerized aromatic-aliphatic semi-aromatic nylon. Background technique [0002] Semi-aromatic nylon is prepared by polycondensation reaction of aliphatic diamine and aromatic ring-containing diacid or aliphatic diacid and aromatic ring-containing diamine, which is a kind of aromatic nylon. Due to the introduction of aromatic ring structure into the main chain of semi-aromatic nylon, the movement of molecular chains is restricted, and the glass transition temperature is significantly increased. Therefore, the heat resistance and mechanical properties of semi-aromatic nylon products have been improved, and the water absorption rate is also different. It has good dimensional stability and solvent resistance, and has better cost performance. It is a high heat-resistant resin between general-purpose plastic nylon and high-temperature-resistant e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/26C08G69/28C08G69/30
CPCC08G69/265C08G69/28C08G69/30
Inventor 汪威雨胡广君吴逸昌王之明朱振达
Owner CHINA RESOURCES PACKAGING MATERIALS CO LTD
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