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Feeding method for preparing semi-aromatic polyamide

A material feeding method and semi-aromatic technology, applied in the field of polymer chemistry, can solve the problems of increasing the difficulty of solvent recovery, consuming solvent production costs and environmental protection costs, and achieving the effects of reducing the difficulty of recovery, reducing residues and reducing costs.

Active Publication Date: 2018-03-09
JIANGSU RUIMEIFU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem with the above method is that ① the consumption of solvent brings additional burden on production cost and environmental protection cost; ② dibasic acid and diamine remaining in the solvent increase the difficulty of solvent recovery; ③ for the difference in solubility of different raw materials, it is necessary to equipment to adjust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A feeding method for preparing semi-aromatic polyamide, comprising the following steps:

[0020] Step 1: Add a certain amount of hexamethylenediamine into the reaction tank A with stirring and biphenyl heating and heat it to 138°C;

[0021] Step 2: Then add terephthalic acid powder into reaction tank A under stirring, the amount of the substance dropped into terephthalic acid should be 1.001 times of the amount of hexamethylenediamine substance, control the feeding speed to be 1200kg / h, and add all Then continue to stir for 1h to keep the temperature at 168°C;

[0022] Step 3: Then pour the mixture into the centrifuge tank B with heat preservation, centrifuge at 168°C for 1 hour, the excess terephthalic acid solids are effectively separated, and the molten salt is filtered from the lower outlet of the centrifuge tank B through the solution After being filtered by filter C, it is injected into the polymerization reactor, and the separated terephthalic acid solid is reco...

Embodiment 2

[0024] A feeding method for preparing semi-aromatic polyamide, comprising the following steps:

[0025] Step 1: Add a certain amount of hexamethylenediamine into the reaction tank A with stirring and biphenyl heating and heat it to 135°C;

[0026] Step 2: Then add terephthalic acid powder into reaction tank A under stirring, the amount of substance dropped into terephthalic acid should be 1.015 times of the amount of hexamethylenediamine substance, and the feed rate is controlled to be 500kg / h, all added Then continue to stir for 1h to keep the temperature at 170°C;

[0027] Step 3: Then pour the mixture into the centrifuge tank B with insulation, and centrifuge at 170°C for 1 hour, the excess terephthalic acid solids are effectively separated, and the molten salt is filtered from the lower outlet of the centrifuge tank B through the solution After being filtered by filter C, it is injected into the polymerization reactor, and the separated terephthalic acid solid is recovere...

Embodiment 3

[0029] A feeding method for preparing semi-aromatic polyamide, comprising the following steps:

[0030] Step 1: Add a certain amount of hexamethylenediamine into the reaction tank A with stirring and biphenyl heating and heat it to 145°C;

[0031] Step 2: Then add the terephthalic acid powder into the reaction tank A under stirring, the amount of the substance dropped into the terephthalic acid should be 1.1 times of the amount of the hexamethylenediamine substance, and the feeding speed is controlled to be 2000kg / h, and all of them are added Then continue to stir for 1h to keep the temperature at 165°C;

[0032] Step 3: Then pour the mixture into the centrifuge tank B with insulation, and centrifuge at 165°C for 1 hour, the excess terephthalic acid solids are effectively separated, and the molten salt is filtered from the lower outlet of the centrifuge tank B through the solution After being filtered by filter C, it is injected into the polymerization reactor, and the separa...

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Abstract

The invention provides a feeding method for preparing semi-aromatic polyamide. The feeding method comprises the following steps: during feeding, controlling the mole ratio of aromatic dicarboxylic acid and aliphatic diamine or aliphatic polyamine as well as the temperature and the feeding speed; then effectively separating out excessive aromatic dicarboxylic acid solids by using a centrifugal separation mode. The feeding method disclosed by the invention has the advantages that firstly, the aromatic dicarboxylic acid can be effectively recovered, so that the cost is reduced; and secondly, residues of the aromatic dicarboxylic acid and the aliphatic diamine or the aliphatic polyamine in a solvent are reduced, so that the recovering difficulty of the solvent is reduced.

Description

technical field [0001] The invention relates to the technical field of polymer chemistry, in particular to a feeding method for preparing semi-aromatic polyamide. Background technique [0002] Semi-aromatic polyamide is a polyamide compound with partly aromatic ring structure and partly linear alkanes between the amide bonds in the molecular chain. The main raw materials for the synthesis of semi-aromatic nylon are aromatic diacids, aromatic diamines, aromatic amino acids and aliphatic diacids, aliphatic diamines, aliphatic amino acids, and aliphatic lactams. More commonly, aromatic diacids and aliphatic diamines are used as raw materials, such as polyhexamethylene terephthalamide (also known as nylon 6T) synthesized from terephthalic acid and hexamethylenediamine. , polyhexamethylene isophthalamide (also known as nylon 6I) synthesized from isophthalic acid and hexamethylenediamine, etc. [0003] In the usual process of preparing polyamide by polymerization of dibasic acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28C08G69/26
CPCC08G69/26C08G69/28
Inventor 杨勇
Owner JIANGSU RUIMEIFU IND