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Method for manufacturing nylon 6

A manufacturing method and technology of polyamide, applied in the field of manufacturing polyamide 6, can solve the problems of undisclosed polyamide crystallinity improvement, etc., and achieve the effects of improving rigidity, crystallinity, and heat distortion temperature

Inactive Publication Date: 2015-11-04
NAGASE CHEMTEX CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, while dissolving carbodiimide in a solvent and adding it, and adding a nucleating agent separately to increase the crystallinity, there is no disclosure about the increase in the crystallinity of polyamide without using a nucleating agent.

Method used

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  • Method for manufacturing nylon 6
  • Method for manufacturing nylon 6
  • Method for manufacturing nylon 6

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1-1~1-5, 2~6, comparative example 1

[0060] The raw material components shown in Table 1 were charged to the reactor. It should be noted that for the raw material components, the raw material composition A formed by mixing caprolactam and the catalyst and the raw material composition B formed by mixing caprolactam, activator and carbodiimide compound are prepared in advance, and the two are equal amounts (parts by weight) ) mixed into the reactor. The raw material composition was used after being melted at 100°C. The polymerization time in the reactor was set to 30 minutes, and the polymerization temperature was set to 150°C. After the polymerization time has elapsed, the polymer is quickly withdrawn from the reactor. The crystallinity of the obtained polymer was measured by using a differential scanning calorimeter DSC6220 manufactured by Seiko Instruments at a heating rate of 20°C / min, and the heat of fusion of the crystal part obtained from the obtaine...

reference example 3

[0068] The result of reference example 3

[0069] The crystal nucleating agent of Reference Example 3 was dissolved in the caprolactam solution, so Reference Examples 3-1 to 3-5 were prepared according to the ratio in Table 3. The results of Reference Example 3 are listed in Table 3 as Reference Examples 3-1 to 3-5. Wherein, Reference Example 3-1 is a blank test. The blending amount values ​​in Table 3 are parts by weight.

[0070] [table 3]

[0071]

[0072] In Reference Example 3, the mixing amount of the crystallization nucleating agent was changed. According to the results in Table 3, it can be seen that the crystallinity of the polymer decreased relative to the blank, or only slightly increased, and there was no crystallinity improving effect.

[0073] On the other hand, as shown in Table 1, it can be seen from the results of Examples that if a carbodiimide compound is used as a crystallinity improving agent, the crystallinity of polyamide 6 obtained by the so-calle...

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Abstract

Provided is a method for manufacturing nylon 6, said method being capable of producing a higher degree of crystallinity in a polymer at the end of a polymerization step performed on an anionically polymerizable caprolactam melt. The present invention is a method in which molten caprolactam in a reactor is anionically polymerized in the presence of a carbodiimide compound and both an anionic-polymerization catalyst and an activator, neither of which is a carbodiimide compound, and a polymer is obtained from the reactor following the end of the polymerization step, yielding nylon 6 with a degree of crystallinity of at least 42% without raising the temperature of the interior of the reactor from the temperature thereof at the end of the polymerization step.

Description

technical field [0001] The present invention relates to a method for producing polyamide 6, which can make the polymer of anionically polymerizable caprolactam higher in crystallinity, in particular to a method for producing polyamide 6, wherein, in the presence of a carbodiimide compound , Anionic polymerization of caprolactam to increase its crystallinity. Background technique [0002] Conventionally, carbodiimide compounds are known as additives for improving the hydrolysis resistance and the like of polymers. For example, Patent Document 1 discloses a tablet for polymer modification containing a carbodiimide compound, but only describes mixing a carbodiimide compound in a polymer to improve its hydrolysis resistance, and does not disclose about Amide crystallinity-enhancing content. Patent Document 2 discloses that polyamide resin is mixed with carbodiimide to improve its hydrolysis resistance, but there is still no disclosure about improvement of polyamide crystallini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/18
CPCC08G69/20C08G69/18C08L77/02C08L79/00
Inventor 安井勉
Owner NAGASE CHEMTEX CORPORATION
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