Preparation method of polyamide and polyamide prepared by the method

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 insufficient fiber formation, difficulty in forming fibers, insufficient strength and elongation of fiber products, etc., and achieve moisture absorption rate Excellent, easy to form, excellent spinning stretchability

Active Publication Date: 2022-07-26
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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  • Preparation method of polyamide and polyamide prepared by the method
  • Preparation method of polyamide and polyamide prepared by the method
  • Preparation method of polyamide and polyamide prepared by the method

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preparation example Construction

[0059] The method for preparing a polyamide according to an embodiment of the present invention includes a first nylon salt as a first reactant, an amino acid or lactam as a second reactant, and a third reactant as a third The step of reacting an elastomer salt of a reactant, wherein the first nylon salt is represented by the following chemical formula 1, and the elastomer salt is formed by a diamine represented by the following chemical formula 5a and a diamine represented by the following chemical formula 5b. prepared by the reaction of carboxylic acids.

[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, the R 1 , R 2 and R 3 Each is independently a C3-C6 alkylene group, the x is an integer of 1-3, the y is an integer of 2-39...

Embodiment approach

[0124] Hereinafter, the embodiments of the present invention will be described in detail so as to be easily implemented by those skilled in the art. However, the present invention can be implemented in various forms, and is not limited to the embodiments described herein.

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 5000 ml of ethanol, 1207 g of adipic acid was added, and the reaction was carried out at 25°C in a nitrogen atmosphere to give A first nylon salt is prepared.

[0129] 2) Preparation of elastomer salt

[0130] A compound having a weight-average molecular weight of 900 g / mol at 1280 g and having polyethylene oxide and polypropylene oxide as the main chain and a terminal consisting of diamine (in the chemical formula 5a, the R 1 and R 3 is isopropylidene, x is 2, y is 15, 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 reacted at 50°C in nitrogen atmosphere 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...

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Abstract

The present invention relates to a method for preparing polyamide and a polyamide prepared by using the method. The method for preparing polyamide comprises combining a first nylon salt as a first reactant, an amino acid or lactam as a second reactant, The step of reacting the elastomeric salt as the third reactant. According to the method for producing a polyamide, the polyamide can be easily formed into fibers while having an excellent water absorption rate of the polyamide, and a polyamide having excellent spin stretchability can be produced.

Description

technical field [0001] The present invention relates to a method for producing a polyamide and a polyamide produced by the method, which can produce a polyamide having excellent water absorption rate, easy formation of fibers, and excellent spinning drawability. Background technique [0002] Nylon 6 fiber has the advantages of excellent rigidity, elastic recovery, dyeability, etc., 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] Generally, the water absorption of a crystalline polymer depends on various factors such as the type of hydrophilic functional group, the crystal structure, and the degree of crystallinity. For nylon, which is one of the c...

Claims

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Application Information

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Patent Type & AuthorityPatents(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
OwnerKOLON IND INC