Para-aramid fine denier fiber and preparation method thereof

A para-aramid and fine-denier fiber technology, which is applied in the field of para-aramid fine-denier fiber and its preparation, can solve the problems affecting the physical properties of the finished fiber, affecting the spinning effect, and unable to produce normally, so as to achieve excellent physical properties , Improve the uniformity and purity, easy to implement the effect

Active Publication Date: 2012-07-11
SINOCHEM HIGH PERFORMANCE FIBER MATERIALS CO LTD
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production method has the following disadvantages: 1) When the para-aramid polymer is dissolved in a strong acid system such as concentrated sulfuric acid, it will dissolve unevenly, and there will be gel particles, which will affect the spinning effect, and even make it impossible to spin. Normal spinning; 2) The degradation of aramid polymer in concentrated sulfuric acid increa

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the para-aramid fine denier fiber of the present embodiment, concrete process is as follows:

[0025] (1) Add 6L of concentrated sulfuric acid with a mass concentration of 99.98% into a 10L kneader, add para-aramid polymer to it under stirring, mix the two, and then send the mixture into a special high-shear Dissolve in a twin-screw extruder (patent number: ZL 200510030946.3) for 20 minutes to obtain a para-aramid polymer solution. In this example, the mass fraction of para-aramid polymer accounts for 18.5% of the solution.

[0026] (2), press the para-aramid polymer solution obtained in step (1) into filter 1 with 800 mesh of filter screen for the first filtration, and then filter for the second time through filter 2 with 1500 mesh of filter screen;

[0027] (3) Send the filtrate obtained by two times of filtration in step (2) to a dedicated continuous film degassing device (patent number: ZL 200720066149.5) to remove air bubbles;

[...

Embodiment 2

[0039] The preparation method of the para-aramid fine denier fiber of the present embodiment, concrete process is as follows:

[0040] (1) Add 5L of concentrated sulfuric acid with a mass concentration of 99.98% into a 10L kneader, add para-aramid polymer to it under stirring, mix the two, and then send the mixture into a special high-shear Dissolve in a twin-screw extruder (patent number: ZL 200510030946.3) for 25 minutes to obtain a para-aramid polymer solution. In this example, the mass fraction of para-aramid polymer accounts for 19.5% of the solution.

[0041] (2), press the para-aramid fiber polymer solution obtained in step (1) into the filter 1 with a filter screen of 600 mesh for the first filtration, and then filter for the second time through the filter 2 with a filter screen of 1200 mesh;

[0042] (3) Send the filtrate obtained by two times of filtration in step (2) into a dedicated continuous film degassing device (patent number: 200720066149.5) to remove ...

Embodiment 3

[0047] The preparation method of the para-aramid fine denier fiber of the present embodiment, concrete process is as follows:

[0048] (1) Add 5L of concentrated sulfuric acid with a mass concentration of 99.98% into a 10L kneader, add para-aramid polymer to it under stirring, mix the two, and then send the mixture into a special high-shear Dissolve in a twin-screw extruder (patent number: ZL 200510030946.3) for 30 minutes to obtain a para-aramid polymer solution. In this example, the mass fraction of para-aramid polymer accounts for 20% of the solution.

[0049] (2), press the para-aramid fiber polymer solution obtained in step (1) into the filter 1 with a filter screen of 700 mesh for the first filtration, and then filter for the second time through the filter 2 with a filter screen of 1500 mesh;

[0050] (3) Send the filtrate obtained by two times of filtration in step (2) into a dedicated continuous film degassing device (patent number: 200720066149.5) to remove ai...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Finenessaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Initial modulusaaaaaaaaaa
Login to view more

Abstract

The invention relates to para-aramid fine denier fiber and a preparation method thereof. The method comprises the following steps: dissolving a para-aramid polymer in a strong acid, filtering twice, defoaming, performing tertiary filtration, spinning, stretching, cooling to solidify, rinsing, drying and rolling to finally prepare the finished fiber. In the preparation method, a high shear double screw extruder and a continuous film defoaming device are adopted, multiple filtering working procedures are adopted, the filtering precision characterized by the filtering plugging value Kw which is no more than 150, the defoaming purity, the spinning temperature, the stretching condition and the like are strictly controlled, the global optimization of process steps and process conditions is performed, the method is practical and is high in operability, and the para-aramid fine denier fiber with good physical properties can be prepared. The para-aramid fine denier fiber has the advantages of high strength and good quality, the fineness is 30-100D, the tensile strength is no less than 22CN/dtex, the elongation at break is no less than 2.5% and the initial modulus is no less than 550CN/dtex.

Description

technical field [0001] The invention belongs to the field of textiles, and in particular relates to a para-aramid fine-denier fiber and a preparation method thereof. Background technique [0002] Aramid fiber is a high-tech special fiber, which is widely used in high-strength tire and rubber industry, bulletproof materials and protective clothing, friction sealing insulation materials, aerospace structural parts, high-strength impact-resistant and wear-resistant composite materials, high-strength corrosion-resistant and Thermal cables and other fields have broad application prospects. With the advancement of aramid fiber preparation technology, the gradual expansion of production, and the good insulation and corrosion resistance of aramid fiber, its application in fiber-reinforced cables and communication electronic equipment has also expanded rapidly, especially in communication There is an increasing demand for aramid fine denier fibers in electronic devices. [0003] In...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): D01D5/06D01D1/02D01D1/10D01F6/90
Inventor 胡盼盼刘兆峰吴清基杨拯
Owner SINOCHEM HIGH PERFORMANCE FIBER MATERIALS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap