Nylon 6 polymerization method and direct spinning method of melt of polymer obtained with nylon 6 polymerization method

A polymerization method, a technology of direct melt spinning, applied in the direction of conjugated synthetic polymer rayon, melt spinning, textiles and papermaking, etc., can solve the problems of inability to control oligomers, low molecular weight of polymers, and no finding, etc.

Active Publication Date: 2016-06-15
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to ensure that the polymerization process is carried out in a liquid state, the polymerization temperature must be at least 10°C higher than the melting point of polyamide 6. At this time, the polymerization temperature still cannot control the oligomer in the range of direct spinning of the melt, and there is another low-temperature polymerization. Disadvantages, that is, the reaction speed is slow, and the molecular weight of the obtained polymer is low; and the polymerization process at a lower temperature is actually divided into two parts, one is a melt polymerization process, and the other is a solid phase polym

Method used

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  • Nylon 6 polymerization method and direct spinning method of melt of polymer obtained with nylon 6 polymerization method
  • Nylon 6 polymerization method and direct spinning method of melt of polymer obtained with nylon 6 polymerization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Embodiment 1 Nylon 6 polymerization method

[0078] A kind of nylon 6 polymerization method, adopts the method for segmental polymerization to prepare nylon 6, and concrete preparation method is as follows:

[0079] The first stage is the ring-opening reaction stage: at a temperature of 150°C and a pressure of 5 MPa, pre-polymerization is carried out after mixing caprolactam, water and a catalyst. The ring-opening reaction time is 3 hours; the water content is 1wt% of the caprolactam, and the catalyst The content is 20wt% of caprolactam, the catalyst is aliphatic amino acid, and the molecular formula is NH 2 (CH 2 ) x COOH, where x=1;

[0080] The obtained product has a number average molecular weight of 1000, an oligomer content of 30%, a cyclic dimer content of less than 0.1%, and a melt viscosity of 1Pa·s;

[0081] The second stage is the pre-condensation stage: under the conditions of pressure of 10Pa and temperature of 220°C, the product obtained from the ring-...

Embodiment 2

[0085] Embodiment 2 Nylon 6 polymerization method

[0086] A kind of nylon 6 polymerization method, adopts the method for segmental polymerization to prepare nylon 6, and concrete preparation method is as follows:

[0087] The first stage is the ring-opening reaction stage: at a temperature of 220° C. and a pressure of 0.1 MPa, pre-polymerization is carried out after mixing caprolactam, water and a catalyst. The ring-opening reaction time is 12 hours; wherein the water content is 20wt% of caprolactam, Catalyst content is 1wt% of caprolactam, catalyst is aliphatic amino acid, molecular formula is NH 2 (CH 2 ) x COOH, where x=16;

[0088] The obtained product has a number average molecular weight of 1500, an oligomer content of 20%, a cyclic dimer content of less than 0.1%, and a melt viscosity of 5 Pa·s;

[0089] The second stage is the pre-condensation stage: under the conditions of a pressure of 200 Pa and a temperature of 180 ° C, the product obtained from the ring-openi...

Embodiment 3

[0093] Embodiment 3 Nylon 6 polymerization method

[0094] A kind of nylon 6 polymerization method, adopts the method for segmental polymerization to prepare nylon 6, and concrete preparation method is as follows:

[0095] The first stage is the ring-opening reaction stage: at a temperature of 180°C and a pressure of 1 MPa, pre-polymerization is carried out after mixing caprolactam, water and a catalyst. The ring-opening reaction time is 5 hours; the water content is 8wt% of caprolactam, and the catalyst The content is 15wt% of caprolactam, the catalyst is aliphatic amino acid, and the molecular formula is NH 2 (CH 2 ) x COOH, where x=8;

[0096] The obtained product has a number average molecular weight of 2000, an oligomer content of 10%, a cyclic dimer content of less than 0.1%, and a melt viscosity of 100 Pa·s;

[0097] The second stage is the pre-condensation stage: under the conditions of pressure of 100Pa and temperature of 200°C, the product obtained from the ring-...

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Abstract

The invention relates a nylon 6 polymerization method and a direct spinning method of a melt of a polymer obtained with the nylon 6 polymerization method. A polyamide 6 prepolymer is prepared at the low temperature, the content of oligomers in the melt is controlled in advance, polymerization is completed before a large quantity of cyclic oligomers are generated with a condensation polymerization dynamic strengthening method, a nylon 6 polymer melt with certain molecular weight is acquired, the content of extracts in the product is smaller than or equal to 1.5 wt%, and the content of cyclic dipolymers is smaller than or equal to 0.2wt%; then, direct melt spinning forming is performed after condensation polymerization dynamic strengthening ends. The process is simple, energy consumption is further reduced while the utilization rate of caprolactam is increased, the obtained melt can be directly used for melt spinning, high-capacity large-scale production is easy to realize, a modifier can be added in the polymerization process, flexible production of nylon 6 is realized, and the nylon 6 can be applied to fibers for clothes, industrial filaments, engineering plastics and other fields.

Description

technical field [0001] The invention belongs to the technical field, and relates to a nylon 6 polymerization method and a melt direct spinning method thereof. Background technique [0002] Due to its excellent physical and mechanical properties and textile processing properties, nylon fiber has ranked first in the synthetic fiber family for a long period of time since its inception. However, due to price and production cost constraints and polyester fiber The rapid development of the synthetic fiber is now the second largest output. In 2013, my country's nylon output was 2.1128 million tons, a year-on-year increase of 12.44%, accounting for about 6.3% of the total synthetic fiber output. Nylon fiber has excellent physical properties unmatched by polyester fiber. For example, nylon fiber has high breaking strength, wear resistance ranks first among general textile fibers, good hygroscopicity, excellent elastic recovery rate and fatigue resistance, and good dyeability. Nylon...

Claims

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Application Information

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IPC IPC(8): C08G69/16D01F6/60D01F1/10D01F1/07D01F1/08D01D5/253
CPCC08G69/16D01D5/253D01F1/07D01F1/08D01F1/10D01F1/103D01F1/106D01F6/60D01D5/08D01F8/12
Inventor 王朝生王华平汤廉李益仁朴宏李建武汪丹越
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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