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

A semi-aromatic and polyamide 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: 2012-11-28
SINOPLAST NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Add hexamethylenediamine, 11-aminoundecanoic acid, and terephthalic acid in the weight of 23.2kg, 40.2kg, and 33.2kg (molar ratio: 1:1:1) into the stirring polymerization reactor after vacuum drying, After evacuating for 10 minutes, pass nitrogen gas for 2 minutes, and cycle like this 6 times, so that the reactant exists in an environment under the protection of nitrogen gas, and control the system pressure in the reactor to 0.2 MPa. Seal the reactor and heat it up to 130°C, and adjust the stirring speed of the polymerization reactor to 200r / min, control the system pressure in the reactor to 1.1MPa, keep the reactant under pressure for 1 hour, and slowly release the gas to normal pressure, Reheat to 300° C., and adjust the stirring speed of the polymerization reactor to 50 r / min. After constant temperature, continue vacuuming for 8 hours, and the reaction ends. Nitrogen-filled material is discharged, cooled in a water tank, and pelletized to prepare PA11T.

[0040] The...

Embodiment 2

[0043]Add hexamethylenediamine, 11-aminoundecanoic acid, and terephthalic acid in the weight of 23.2kg, 80.4kg, and 33.2kg (molar ratio: 1:2:1) into the stirring polymerization reactor after vacuum drying, After evacuating for 10 minutes, pass nitrogen gas for 2 minutes, and circulate like this 6 times, so that the reactant exists in the environment under the protection of nitrogen gas, and the system pressure in the reactor is controlled to be 0.2 MPa. Seal the reactor and heat it to 130°C, and adjust the stirring speed of the polymerization reactor to 200r / min, control the system pressure in the reactor to 1.1MPa, keep the reactants warm and pressurized for 1 hour, and slowly release the gas to normal pressure, Reheat to 300° C., and adjust the stirring speed of the polymerization reactor to 50 r / min. After constant temperature, continue vacuuming for 8 hours, and the reaction ends. Nitrogen-filled material is discharged, cooled in a water tank, and pelletized to prepare PA1...

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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 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, long carbon chain semi-aromatic polyamide is composed of aliphatic diamine, Diacids or aliphatic amino acids and diamines and diacids with aromatic rings are obtained by polycondensation. It is a type of aromatic nylon. It has better mechanical properties than aliphatic polyamides and is comparable to fully aromatic polyamides. Compared with the characteristics of easy processing, it is the main variety of high-temperature-resistant nylon. Its performance is between general-purpose engineering plastic nylon and high-temperature-resistant engineering ...

Claims

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Application Information

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