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Long carbon-chain semi-aromatic polyamide and synthetic method of same

A semi-aromatic, synthetic method technology, applied in the field of materials, can solve the problems that have not been reported, and achieve the effect of simple preparation process and controllable polymerization process

Active Publication Date: 2014-04-30
SINOPLAST NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the research on the synthesis process of PA11T has become the main direction of technical personnel. At present, there is no report on the synthesis technology and process of PA11T in China.

Method used

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  • Long carbon-chain semi-aromatic polyamide and synthetic method of same
  • Long carbon-chain semi-aromatic polyamide and synthetic method of same
  • Long carbon-chain semi-aromatic polyamide and synthetic method of same

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Experimental program
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Effect test

Embodiment 1

[0039] The vacuum-dried hexamethylenediamine, 11-aminoundecanoic acid, and terephthalic acid were respectively added to the stirring polymerization reactor in the weight of 23.2kg, 40.2kg, and 33.2kg (molar ratio of 1:1:1). After evacuating for 10 min, nitrogen was passed for 2 min, and this cycle was repeated 6 times, so that the reactant existed in the environment under nitrogen protection, and the system pressure in the reactor was controlled to be 0.2 MPa. The reactor was sealed and heated to 130°C, and the stirring speed of the polymerization reactor was adjusted to 200 r / min. It was heated to 300°C again, and the stirring speed of the polymerization reactor was adjusted to 50 r / min. After constant temperature, the vacuum was continued for 8 hours, and the reaction was completed. Nitrogen charged to discharge, cooled in a water tank, and pelletized to prepare PA11T.

[0040] The reaction formula of PA11T is as follows:

[0041]

Embodiment 2

[0043]The vacuum-dried hexamethylenediamine, 11-aminoundecanoic acid, and terephthalic acid were added to the stirring polymerization reactor by weights of 23.2kg, 80.4kg, and 33.2kg (molar ratio of 1:2:1), respectively, After evacuating for 10 min, nitrogen was passed for 2 min, and this cycle was repeated 6 times, so that the reactant existed in the environment under nitrogen protection, and the system pressure in the reactor was controlled to be 0.2 MPa. The reactor was sealed and heated to 130°C, and the stirring speed of the polymerization reactor was adjusted to 200 r / min. It was heated to 300°C again, and the stirring speed of the polymerization reactor was adjusted to 50 r / min. After constant temperature, the vacuum was continued for 8 hours, and the reaction was completed. Nitrogen charged to discharge, cooled in a water tank, and pelletized to prepare PA11T.

[0044] The reaction formula of PA11T is as follows:

[0045]

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Abstract

The invention discloses a long carbon-chain semi-aromatic polyamide and preparation method of the same. The long carbon-chain semi-aromatic polyamide has good heat resistance, rigidity at high temperature, chemical resistance and size stability, and low water absorption. The synthetic method of the invention comprises: first, adding dried diamine monomer, 11-aminoundecanoic acid, and terephthalic acid into a stirred polymerization reactor according to a certain mol ratio, after vacuum-pumping, feeding in inert gas, heating the reactor hermetically to 120-170 DEG C, and maintaining the temperature and the condition of self pressure for the reactants for 0.5-24 hours before venting to normal pressure; and then reheating to 300-350 DEG C, and keeping vacuum-pumping after reaching the constant temperature. The polyamide of the invention is simple in preparation technology, controllable in polymerization process, and can replace steels by being applied to the fields such as automobiles, machinery, and electronic and electrical equipment.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a method for synthesizing a long carbon chain semi-aromatic polyamide (PA11T). Background technique [0002] High temperature resistant polyamide is one of the members of the polyamide family. Because it contains benzene ring or other aromatic ring structure in its molecular structure, it has the characteristics of high temperature resistance. The long carbon chain semi-aromatic polyamide is composed of aliphatic diamine, Diacid or aliphatic amino acid, diamine and diacid with aromatic ring are obtained by polycondensation. It is a kind of aromatic nylon. It has better mechanical properties than aliphatic polyamide. It has the characteristics of easy processing and is the main variety of high temperature resistant nylon. Its performance is between the general engineering plastic nylon and the high temperature engineering plastic PEEK, and the market demand shows an upward trend. Long ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/36
Inventor 朱怀才王忠强
Owner SINOPLAST NEW MATERIAL
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