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Synthetic method of continuously copolymerized semi-aromatic nylon

A semi-aromatic nylon and synthetic method technology, applied in the field of materials, can solve the problems of unfavorable environmental protection, high organic matter emission, high melting point, etc., and achieve the effects of saving costs, reducing organic matter emission, and increasing reaction temperature

Active Publication Date: 2014-01-29
NANJING JULONG SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing semi-aromatic nylon synthesis method mainly adopts the solution salt-forming polycondensation method, and its disadvantages are: in the synthesis process, there is often a lack of sufficient devolatilization process, so that a large amount of volatiles appear when the nylon is granulated; due to the fluidity of the nylon melt It is easy to cause the phenomenon of "flushing" during the granulation process; the synthetic nylon has high viscosity and high melting point, and it is difficult to disperse the filling material in the later modification; using alcohol as a solvent, the organic matter discharge is high, which is not conducive to environmental protection

Method used

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  • Synthetic method of continuously copolymerized semi-aromatic nylon
  • Synthetic method of continuously copolymerized semi-aromatic nylon

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The steps of this embodiment are as follows figure 1 Shown: Add 70Kg of hexamethylenediamine into the heating kettle, raise the temperature to 48°C, stir and melt, after the hexamethylenediamine is completely melted, add it into the reaction kettle through the liquid metering pump, and start the reaction kettle to stir. 150Kg of deionized water is added into the salt-forming kettle through a liquid metering pump, 36.5Kg of adipic acid and 41.5Kg of terephthalic acid are added into the reaction kettle through a weight-loss feeder, and finally 250g of antioxidant (antioxidant Composed of phosphite antioxidants and hindered phenolic antioxidants in a weight ratio of 1:0.4), 250 grams of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)- 5-Chlorobenzotriazole, 120g sodium hypophosphite is added in the reactor through the manual feeding port. Under the condition of stirring, the temperature was slowly raised to 50° C. for 4 hours to obtain a clear nylon salt solution.

[0028] ...

Embodiment 2

[0033] The steps of this embodiment are as follows figure 1Shown: Add 60Kg of decanediamine into the heating kettle, raise the temperature to 48°C, stir and melt, after the decanediamine is completely melted, add it into the salt forming kettle through a liquid metering pump, and start the reaction kettle to stir. 160Kg of deionized water is added into the reactor through a liquid metering pump, 50Kg of sebacic acid and 41.5Kg of terephthalic acid are added into the reactor through a weight loss feeder, and finally 300g of antioxidant (antioxidant is made of Phosphate ester antioxidant and hindered phenol antioxidant (composed by weight ratio 1:0.5), 300g chain extender diaminodiphenylmethane, and 150Kg sodium hypophosphite were added to the reactor through the artificial feeding port. Under the condition of stirring, the temperature was slowly increased to 50° C. for 5 h to obtain a clear nylon salt solution.

[0034] Pour the nylon salt solution into the high-level reaction...

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Abstract

The invention relates to a synthetic method of a continuously copolymerized semi-aromatic nylon, and belongs to the field of material technology. Compared with existing technology, water is taken as a solvent, a synthetic technology of semi-aromatic nylon is improved and optimized, and the synthetic method with operability is provided. Reaction temperature is increased greatly, the highest reaction temperature is increased to about 300 DEG C, so that full drying of high-temperature nylon melt is realized before extrusion pelleting, residual small molecules are removed, and ''material overflow'' occurred when the melt is delivered into an extruder is avoided. Cost is reduced; organic substance discharge amount is reduced; and the synthetic method is green, and possesses significant economic values and social values.

Description

technical field [0001] The invention relates to a method for synthesizing semi-aromatic nylon, belonging to the technical field of materials. Background technique [0002] At the end of the last century, due to the plasticization of electronics, motor parts, and auto parts, there were further requirements for their performance, especially the development of Surface Mount Technology (SMT), connectors, switches, relays, capacitors and other electrical appliances. The components are installed and connected on the circuit board at the same time, which promotes the miniaturization and densification of electronic components, and the project cost is reduced by 20-30% compared with the previous products. However, using SMT technology, each electrical component and circuit board must be heated in an infrared heating device at the same time, which puts forward higher requirements on the reflow resistance and dimensional stability of the materials made of each component and circuit boa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08G69/28C08G69/30C08K13/02C08K13/04C08K7/14C08K3/26C08K3/34C08K5/526C08K5/13C08K5/3475C08K5/07C08K5/20C08K5/09C08K5/098C08L77/06C08L23/08C08L53/02C08L23/16C08L51/06
Inventor 李云岩牧晓春吴汾
Owner NANJING JULONG SCI&TECH CO LTD
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