PLA (polylactic acid) conductive fiber and preparation method thereof

A conductive fiber and polylactic acid technology, applied in the manufacture of conductive/antistatic filaments, melt spinning, stretch spinning, etc., can solve the problems of poor mechanical properties of conductive fibers, white pollution, and shortage of synthetic fiber resources, and achieve Low percolation threshold, convenient operation and good spinnability

Active Publication Date: 2015-06-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country is a big country of fiber production. The output of synthetic fiber has ranked first in the world for 15 consecutive years. The total value of fiber and its textiles accounts for about 10% of my country's GDP, and exports account for 1 / 4, which is very important in the national economy. At present, the development of synthetic fibers in my country has the following problems: First, the development of synthetic fibers is restricted by the shortage of resources, and more than 90% of the raw materials of synthetic fibers depend on oil, and the total amount of proven oil and the consumption rate are calculated , 50 years later, fiber and its related industries will be in a state of "cooking without rice"; secondly, the development of synthetic fibers is restricted by environmental pollution, and petroleum-based chemical fibers cannot be degraded in nature, which will bring very serious "white pollution". Seriously affect people's quality of life
However, the research and development work on the functionalization of PLA fibers is less, and the conductive functionalization of fibers is the focus of development and research in the industry and academia. Therefore, it is necessary to realize the conductive functionalization of PLA fibers, and currently only Petra at the Institute of Polymer Research in Dresden, Germany 【 P.; Kobashi, K.; Villmow, T.; Andres, T.; Paiva, M.C.; Covas, J.A. Liquid sensing properties of melt processed polypropylene / poly(e-caprolactone blends containing multiwalled carbon nanotubes. 71, 1451-1460.] PCL / PLA / MWNTs conductive fibers were prepared by melt spinning, but the mechanical properties of the obtained conductive fibers were poor, and the breaking strength and elongation at break of the obtained as-spun fibers were only 22MPa and 6.2% respectively , has no practical application value in the textile field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) First weigh 50 parts of PLA (the content of D-lactic acid unit is 2.1mol%), 50 parts of P(VAc-co-VA) and 4 parts of carbon black and dry them in a vacuum oven for 12 hours (80°C), 48 hours (40°C) and 8 hours (100°C), then put them into a high-speed mixer and dry mix for 3 minutes, and then blend and granulate in a twin-screw blender to obtain PLA conductive masterbatches. The granulation temperature was 170° C., the screw speed was 75 rpm, and the melt blending time was 8 minutes.

[0024] (2) Spin the PLA conductive masterbatch on a melt spinning machine to obtain conductive PLA primary fibers, the spinning temperature is 190°C, and the winding speed is 1500m / min;

[0025] (3) Draw the as-spun fibers to obtain PLA conductive fibers, the drawing temperature is 110° C., and the drawing ratio is 3 times. The electrical conductivity of the obtained PLA conductive fiber was 1.52 S / m, the breaking strength was 2.5 cN / dtex, and the breaking elongation was 50.5%.

Embodiment 2

[0027] (1) First weigh 60 parts of PLA (the content of D-lactic acid unit is 0.5 mol%), 40 parts of P(VAc-co-VA) and 3 parts of MWCNTs and dry them in a vacuum oven for 15 hours (70°C), 36 hours (45°C) and 8 hours (110°C), and then they were put into a high-speed mixer and dry-blended for 4 minutes, and then blended and granulated in a twin-screw blender to obtain PLA conductive masterbatches. The granulation temperature was 180° C., the screw speed was 60 rpm, and the melt blending time was 7 minutes.

[0028] (2) Spin the PLA conductive masterbatch on a melt spinning machine to obtain conductive PLA primary fibers, the spinning temperature is 200°C, and the winding speed is 3000m / min;

[0029] (3) Draw the as-spun fibers to obtain PLA conductive fibers, the drawing temperature is 100° C., and the drawing ratio is 4 times. The electrical conductivity of the obtained PLA conductive fiber was 1.78 S / m, the breaking strength was 3.0 cN / dtex, and the breaking elongation was 30.8...

Embodiment 3

[0031] (1) First weigh 65 parts of PLA (the content of D-lactic acid unit is 1.0 mol%), 35 parts of P(VAc-co-VA) and 2.5 parts of SWCNTs and dry them in a vacuum oven for 12 hours (90°C), 48 parts respectively. hours (40°C) and 12 hours (100°C), put the dry P(VAc-co-VA) and conductive masterbatch into a high-speed mixer for 3 minutes, and then blend and granulate in a twin-screw blender , and then mixed and granulated in a twin-screw blender to obtain P(VAc-co-VA) conductive masterbatch, the melt blending temperature is 170 ° C, the speed is 75rmp, and the melt blending time is 6 minutes; the dry PLA Put the obtained P(VAc-co-VA) conductive masterbatch into a high-speed mixer and dry mix for 3 minutes, melt and blend to obtain PLA conductive masterbatch, the temperature is 190°C, the speed is 80rmp, and the melt blending time is 6 minutes , to get PLA conductive masterbatch.

[0032] (2) Spin the PLA conductive masterbatch on a melt spinning machine to obtain conductive PLA p...

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Abstract

The invention discloses a PLA (polylactic acid) conductive fiber and a preparation method thereof. The fiber comprises the following raw materials in parts by weight: 50-80 parts of PLA, 20-50 parts of P (VAc-co-VA) and 0.05-8 parts of conductive filler. The preparation method of the PLA conductive fiber comprises the following steps of: (1) weighing the dried PLA, P (VAc-co-VA) and conductive filler according to the proportions, premixing, and granulating in a blending way to obtain conductive master batches of the PLA; or firstly, weighing the P (VAc-co-VA) and the conductive filler according to the proportions, premixing, granulating in a blending way to obtain conductive master batches of the P (VAc-co-VA), and then blending with the PLA to obtain conductive master batches of the PLA; and (2) carrying out melt spinning-drafting on the conductive master batches of the PLA to obtain PLA conductive fiber. The conductive fiber can be taken as an electrode material, an anti-static material, a low-temperature heating material, an electromagnetic shielding material, a heat-sensitive material, a gas-sensitive material and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to polylactic acid (PLA) conductive fibers and a preparation method thereof. Background technique [0002] my country is a big country of fiber production. The output of synthetic fiber has ranked first in the world for 15 consecutive years. The total value of fiber and its textiles accounts for about 10% of my country's GDP, and exports account for 1 / 4, which is very important in the national economy. At present, the development of synthetic fibers in my country has the following problems: First, the development of synthetic fibers is restricted by the shortage of resources, and more than 90% of the raw materials of synthetic fibers depend on oil, and the total amount of proven oil and the consumption rate are calculated , 50 years later, fiber and its related industries will be in a state of "cooking without rice"; secondly, the development of synthetic fibers is restricted by envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/09D01D1/04D01D5/08D01D5/12
Inventor 刘庆生邓炳耀
Owner JIANGNAN UNIV
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