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Manufacturing process of polyamide 6 with high-strength structure

A manufacturing process, polyamide technology, applied in the field of high-strength fibers, can solve the problems of coefficient of variation of strength, coefficient of variation of tensile elongation not meeting the standard requirements, poor quality, etc.

Active Publication Date: 2021-02-26
GUANGDONG XINHUI MEIDA NYLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing technology, the tensile strength of domestic high-strength polyamide 6 fibers can rarely reach more than 10.0cN / dtex, and its coefficient of variation of strength and coefficient of variation of tensile elongation cannot meet the standard requirements, and the quality is poor.

Method used

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  • Manufacturing process of polyamide 6 with high-strength structure
  • Manufacturing process of polyamide 6 with high-strength structure
  • Manufacturing process of polyamide 6 with high-strength structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one: a kind of manufacturing process of high-strength structural polyamide 6, it comprises the following steps:

[0028] 1. Feeding stage: Add PA6 spinning raw material into the screw extruder, and the relative viscosity of the raw material is 2.65;

[0029] 2. Melting stage: After the PA6 spinning raw material enters the screw extruder, it melts under the high temperature environment of the screw extruder, and is further mixed evenly under the stirring of the screw. The temperature of the screw temperature zone is set to 255 degrees, and the temperature of biphenyl is 270 degrees;

[0030] 3. Spinning stage: After the melt is melted and mixed evenly by the screw, it enters the spinning box, and is sprayed out through the spinning assembly and spinneret 1 to form PA6 primary filament bundles. The spinning assembly uses a newly designed and processed spinneret 1 Assembly, the pressure of the spinning assembly is adjusted to 13.0Mpa, the spinneret is provided ...

Embodiment 2

[0036] Embodiment two: a kind of manufacturing process of high-strength structural polyamide 6, it comprises the following steps:

[0037] 1. Feeding stage: Add PA6 spinning raw material into the screw extruder, and the relative viscosity of the raw material is 3.01;

[0038] 2. Melting stage: After the PA6 spinning raw material enters the screw extruder, it melts in the high temperature environment of the screw extruder, and is further mixed evenly under the agitation of the screw. The temperature of the screw temperature zone is set to 260 degrees, and the biphenyl temperature is 275 degrees;

[0039] 3. Spinning stage: After the melt is melted and mixed evenly by the screw, it enters the spinning box, and is sprayed out through the spinning assembly and spinneret to form PA6 primary filament bundles, and the spinning assembly is assembled with a newly designed and processed spinneret , the spinning assembly pressure is adjusted to 15.0Mpa, the spinneret is provided with mult...

Embodiment 3

[0045] Embodiment three: a kind of manufacturing process of high-strength structural polyamide 6, it comprises the following steps:

[0046] 1. Feeding stage: Add PA6 spinning raw material into the screw extruder, and the relative viscosity of the raw material is 3.15;

[0047] 2. Melting stage: After the PA6 spinning raw material enters the screw extruder, it melts in the high temperature environment of the screw extruder, and is further mixed evenly under the stirring of the screw. The temperature of the screw temperature zone is set to 280 degrees, and the temperature of biphenyl is 280 degrees;

[0048] 3. Spinning stage: After the melt is melted and mixed evenly by the screw, it enters the spinning box, and is sprayed out through the spinning assembly and spinneret to form PA6 primary filament bundles, and the spinning assembly is assembled with a newly designed and processed spinneret , the spinning assembly pressure is adjusted to 18.0Mpa, the spinneret is provided wit...

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Abstract

The invention discloses a manufacturing process of polyamide 6 fiber with a high-strength structure. The process comprises the following steps of step one, a feeding stage, wherein a PA6 spinning rawmaterial is added into a screw extruder, and it is ensured that the relative viscosity of the raw material is between 2.6 and 3.2; step two, a melting stage, wherein after the PA6 spinning raw material enters the screw extruder, the PA6 spinning raw material is melt in a high-temperature environment of the screw extruder and further uniformly mixed under stirring of a screw, the temperature of a screw temperature zone is set to be 255-280 DEG C, and the biphenyl temperature is set to be 270-280 DEG C; step three, a spinning stage, wherein after a melt which is melted and uniformly mixed by thescrew enters a spinning manifold, spraying is carried out through a spinning assembly and a spinneret plate to form PA6 nascent tows, and the pressure of the spinning assembly is adjusted to 13.0-18.0 Mpa; step four, the nascent tows are bundled and oiled after the nascent tows are cooled by a slow cooling device and cross air blow; and step five, multi-stage drafting and heat setting are performed on the cooled and oiled tows, and the tows are rolled into a filament roll. According to the manufacturing process of the polyamide 6 fiber with the high-strength structure, tensile strength is high, and quality is good.

Description

technical field [0001] The invention relates to the technical field of high-strength fibers, in particular to a manufacturing process of high-strength structural polyamide 6. Background technique [0002] High-strength polyamide 6 (PA6) fibers are mainly based on technologies such as melt spinning, dry spinning, and regional stretching heat setting. High-strength polyamide 6 fibers have great demand in both military and civilian aspects. The fiber mainly refers to a fiber whose tensile breaking strength reaches 6.0 cN / dtex or more. According to the existing technology, the tensile strength of domestic high-strength polyamide 6 fibers can rarely reach more than 10.0cN / dtex, and its coefficient of variation of strength and coefficient of variation of tensile elongation cannot meet the standard requirements, and the quality is poor. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the above defects of the prior art...

Claims

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Application Information

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IPC IPC(8): D01D5/08D01D5/088D01D5/096D01D5/16D01D10/02
CPCD01D5/08D01D5/088D01D5/096D01D5/16D01D10/02
Inventor 李细林陈欣梁铁贤黄建华林华纲
Owner GUANGDONG XINHUI MEIDA NYLON
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