Method for preparing semi-aromatic nylon salt

The technology of semi-aromatic nylon and aromatic dibasic acid is applied in the field of preparation of semi-aromatic nylon salt, and can solve the problems of low solubility, difficulty in obtaining semi-aromatic nylon salt, difficulty in purifying semi-aromatic nylon salt, etc. high purity effect

Active Publication Date: 2012-05-30
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But, there is such a problem in the prior art, both when preparing semi-aromatic nylon salt with water or alcohol as solvent, because the dissolubility of aromatic dibasic acid and semi-aromatic nylon salt in these solvents is very little, purification Semi-aromatic nylon salts have become difficult, and it is difficult to obtain pure semi-aromatic nylon salts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 16.61Kg terephthalic acid (100mol) and 40Kg dimethylformamide evenly, and heat to 120°C while stirring to form A solution; Mix evenly, heat to 80°C while stirring to make solution B; mix solution A and solution B evenly, heat to 120°C, and keep stirring at the same time to make it react fully; after centrifugation, use After washing with dimethylformamide, wash with deionized water several times to obtain 32.28Kg of semi-aromatic nylon salt (10T), with a yield of 95.4%. The melting point of semi-aromatic nylon salt (10T) is 260°C.

Embodiment 2

[0019] Mix 16.61Kg of isophthalic acid (100mol) and 40Kg of dimethylformamide evenly, and heat to 120°C while stirring to form A solution; Mix evenly, heat to 80°C while stirring to make solution B; mix solution A and solution B evenly, heat to 120°C, and keep stirring at the same time to make it react fully; after centrifugation, use After washing with dimethylformamide, it was washed several times with deionized water to obtain 32.08 Kg of semi-aromatic nylon salt (10I), with a yield of 94.8%. The melting point of semi-aromatic nylon salt (10I) was 202°C.

Embodiment 3

[0021] Mix 16.61Kg terephthalic acid (100mol) and 40Kg dimethylformamide evenly, and heat to 120°C while stirring to form A solution; then mix 11.62Kg hexamethylenediamine (100mol) and 20Kg dimethylformamide Mix evenly, heat to 80°C while stirring to make solution B; mix solution A and solution B evenly, heat to 120°C, and keep stirring at the same time to make it react fully; after centrifugation, use After washing with dimethylformamide, wash with deionized water several times to obtain 27.13Kg of semi-aromatic nylon salt (6T), with a yield of 96.1%. The melting point of semi-aromatic nylon salt (6T) is 287°C.

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Abstract

The invention discloses a method for preparing a semi-aromatic nylon salt. The method is to make aromatic dibasic acid and aliphatic diamine subjected to neutralization reaction in an organic solvent, perform centrifugal separation, wash obtained deposit, and obtain the semi-aromatic nylon salt. The semi-aromatic nylon salt prepared by the method has high purity, and the method can accurately control the mol ratio of the dibasic acid to the diamine to be equal under the condition of polycondensation. The organic solvent selected by the method can dissolve the aromatic dibasic acid and the aliphatic diamine but can not dissolve the semi-aromatic nylon salt, so that the generated nylon salt can be easily separated and purified. Moreover, the solvent used for preparing the semi-aromatic nylon salt can be recycled.

Description

technical field [0001] The invention relates to the preparation technology of semi-aromatic nylon salt. Background technique [0002] Aliphatic nylon, such as PA6, PA66, has excellent mechanical strength, heat resistance, chemical resistance, wear resistance and self-lubrication, and low friction coefficient. Its application fields include electronic appliances, automotive parts, furniture, Building materials and fibers have become one of the most important engineering plastics. [0003] In recent years, with the increasing requirements for plastic materials in the fields of automobiles, electronic appliances, etc., the market demand for high-temperature-resistant semi-aromatic nylon, which has typical excellent properties of nylon and has a greatly increased heat-resistant temperature, has expanded rapidly. Semi-aromatic nylons include PA6T, PA9T, PA10T, PA12T, etc. Due to their high crystallinity, low water absorption, and excellent heat resistance, they can be used as el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C63/14C07C211/33C08G63/181
Inventor 曹民夏世勇黄险波曾祥斌罗湘安史振国陈健
Owner KINGFA SCI & TECH CO LTD
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