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Method for preparing polyamide and polyamide prepared thereby

A technology of polyamide and lactam, which is applied in the preparation of polyamide and the field of polyamide prepared by using it, can solve the problems of difficulty in forming fibers, insufficient fiber formability, insufficient stretchability of fiber preparation process, etc., and achieves easy formation, Excellent spinning drawability and excellent moisture absorption

Active Publication Date: 2020-04-17
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, in order to improve the moisture regain, although the preparation method of nylon 46 and nylon 6 copolymerized and added with hydrophilic additives has been developed, due to the lack of fiber formation at this time, the stretchability in the fiber preparation process Insufficient, and the strength and elongation of the fiber product are insufficient
[0011] In addition, although the technology of synthesizing copolymers to lower the melting point has been developed, it cannot maintain the excellent moisture absorption rate of nylon 4 or it is difficult to form fibers

Method used

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  • Method for preparing polyamide and polyamide prepared thereby
  • Method for preparing polyamide and polyamide prepared thereby
  • Method for preparing polyamide and polyamide prepared thereby

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preparation example Construction

[0059] The preparation method of the polyamide of one embodiment of the present invention comprises the first nylon salt (nylon salt) as the first reactant, the amino acid (amino acid) or lactam (lactam) as the second reactant and the third reactant A step of reacting the elastomer salt of the reactant, wherein the first nylon salt is represented by the following chemical formula 1, and the elastomer salt is passed through the diamine represented by the following chemical formula 5a and the diamine represented by the following chemical formula 5b. Carboxylic acid reaction and preparation.

[0060] Chemical formula 1:

[0061]

[0062] Chemical formula 5a:

[0063]

[0064] Chemical formula 5b:

[0065]

[0066] In the chemical formula 1, chemical formula 5a and chemical formula 5b, the X 1 and Y 1 Each independently is a C4 alkylene group, the Y is a C3-C6 alkylene group, and the R 1 , R 2 and R 3 Each is independently a C3-C6 alkylene group, the x is an intege...

Embodiment approach

[0124] Hereinafter, the embodiments of the present invention will be described in detail so that those skilled in the art can easily implement them. However, the present invention can be realized in various forms, and is not limited to the embodiments described here.

Embodiment 1

[0127] 1) Preparation of the first nylon salt

[0128] To an ethanol solution of 1,4-diaminobutane prepared by dissolving 728 g of 1,4-diaminobutane in 5,000 ml of ethanol, add 1,207 g of adipic acid, and react under a nitrogen atmosphere at 25° C. A first nylon salt is prepared.

[0129] 2) Preparation of elastomer salt

[0130] The weight average molecular weight at 1280g is 900g / mol and take polyethylene oxide and polypropylene oxide as the main chain, and the compound (in the chemical formula 5a, the R 1 and R 3 is isopropylidene, x is 2, y is 15, and z is 2), after adding 400ml of ethanol to dissolve and prepare, add 2008g of adipic acid (in the chemical formula 5b, the Y is butylene ), and react under nitrogen atmosphere at 50°C to prepare elastomer salt.

[0131] 3) Preparation of polyamide copolymer resin

[0132] 1.4kg of ε-caprolactam, the prepared first nylon salt and elastomer salt were put into a 20L reactor, and after 4g of phenolic antioxidant was added, 70...

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Abstract

The present invention relates to a method for preparing a polyamide and a polyamide prepared thereby. The method for preparing a polyamide comprises the step of reacting a first nylon salt as a firstreactant, an amino acid or a lactam as a second reactant, and an elastomer salt as a third reactant. According to the method for preparing a polyamide, it is possible to prepare a polyamide which caneasily be formed into a fiber while exhibiting excellent moisture absorption rate, and which has an excellent spin-draw property.

Description

technical field [0001] The present invention relates to a method for producing polyamide and the polyamide produced by the method, capable of producing a polyamide that is excellent in moisture absorption rate, easy to form fibers, and excellent in spinning stretchability. Background technique [0002] Nylon 6 fiber has advantages such as excellent rigidity, elastic recovery, and dyeability, but most synthetic fibers including nylon 6 fiber have the disadvantage of low water absorption, while cotton (cotton), which is a natural fiber, has excellent water absorption and Compared with the existing synthetic fibers, it has a good touch, but the moisture drying speed is extremely slow, the UV shielding property is extremely insufficient, and the price is high. [0003] In general, the water absorption of a crystalline polymer depends on various factors such as the type of hydrophilic functional group, crystal structure, and degree of crystallinity. In the case of nylon as one o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/36C08G69/14D01F6/80
CPCC08G69/14C08G69/36D01F6/80
Inventor 金维炫姜东宪朴智用黄永男
Owner KOLON IND INC