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Nylon manufacturing method

A manufacturing method and nylon technology, applied in the field of manufacturing nylon, can solve the problems of large fluctuation of product quality and difficult adjustment of nylon viscosity, and achieve the effects of simple steps, low cost and cost saving

Active Publication Date: 2014-09-10
CATHAY R&D CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a kind of brand-new nylon manufacturing method, and this method can accurately prepare the green nylon that is suitable for the viscosity number requirement of different application fields with low cost, overcomes that the viscosity number is difficult to adjust when preparing nylon, and product quality is affected. It is an industrial problem that fluctuates greatly due to the influence of raw material quality. At the same time, unexpected effects have been found in the process of melt polymerization, that is, the volatilization of diamines is obviously inhibited, the amount of diamines is reduced, costs are saved, and pollution is reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Take 270g of water and add it to an 800mL beaker, then add 12.36g of pentamethylenediamine and 17.64g of adipic acid to obtain a 10wt% nylon salt solution. (25°C), a total of 12.41 g of pentamethylenediamine was consumed, that is, the weight ratio of diacid to diamine was 17.64:12.41.

[0074] In the 100L K / SY166-2007 type polymerization kettle, add 12.41 kg of pentamethylenediamine (manufactured by Shandong Kaiser, the purity of gas phase normalization method is 99.56%), 17.64 kg of adipic acid (manufactured by Liaoning Petrochemical, excellent product), Brüggemann Antioxidant H10 6g. Raise the temperature of the oil bath to 230°C, and gradually raise the temperature to 285°C. When the pressure in the kettle rises to 1.73MPa, start to exhaust and maintain the pressure. When the temperature of the solution rises to 240°C, start to depressurize the polymerization kettle at a certain rate The internal pressure was reduced to normal pressure, and when the internal pressur...

Embodiment 2

[0076] Take 270g of water and put it into an 800mL beaker, then add 12.36g of pentamethylenediamine and 17.64g of adipic acid to obtain a 10wt% nylon salt solution, control the temperature of the solution at 25°C, and then add dropwise of pentamethylenediamine to adjust the pH value of the solution to 8.20 (25°C), a total of 12.45 g of pentamethylenediamine was consumed, that is, the weight ratio of diacid to diamine was 17.64:12.45.

[0077] Operate in the same manner as in Example 1 except that the amount of pentamethylenediamine added in Example 1 is adjusted to 12.45 kg. The obtained nylon 56 was tested for viscosity number. The results are shown in Table 3.

Embodiment 3

[0079] Except not adding the Brüggemann antioxidant in Example 2, it was performed in the same manner as in Example 2. The obtained nylon 56 was tested for viscosity number. The results are shown in Table 3.

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Abstract

The invention provides a nylon manufacturing method. The nylon manufacturing method comprises the following steps of 1, preparing a nylon salt aqueous solution from diamine and diacid, adjusting a pH value of the nylon salt aqueous solution to a specific value by diamine, and calculating a use amount ratio of the diamine to the diacid at the pH value equal to the specific value, and 2, adding the diamine to the diacid according to the calculated use amount ratio and carrying out a fusion polymerization process without a medium. The nylon manufacturing method reduces volatilization of the diamine in polymerization, saves a cost, reduces pollution, shortens a polymerization period, improves an equipment utilization rate, reduces polymerization energy consumption and can prepare green nylon suitable for a plurality of purposes.

Description

technical field [0001] The invention relates to a method for producing nylon by melt polymerization. Specifically, it relates to a method for producing nylon by first determining the dosage ratio of diamine and dibasic acid, then feeding materials according to the dosage ratio, and carrying out melt polymerization in the absence of a medium. Background technique [0002] In recent years, plastics using plant resources as raw materials, ie, biomass-derived plastics, have attracted attention. The use of diamines prepared from biomass as raw materials to manufacture green nylon is conducive to the suppression of carbon dioxide emissions and the construction of a recycling society. Against such a background, nylon and the like using pentamethylenediamine obtained from lysine as a raw material, especially nylon 56, are highly anticipated as plant-derived polymers. Compared with nylon 6 and nylon 66, nylon 56 has substantially the same heat resistance and mechanical properties. ...

Claims

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Application Information

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IPC IPC(8): C08G69/28C08G69/34C08L77/06
Inventor 郑毅秦兵兵刘驰
Owner CATHAY R&D CENT CO LTD
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