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Modified polylactic acid fiber and preparation method thereof

A technology of polylactic acid fiber and poly-D-lactic acid, which can be used in the chemical characteristics of fibers, rayon manufacturing, single-component polyester rayon, etc. Poor heat and other issues

Active Publication Date: 2016-04-20
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to defects such as high brittleness, high hardness, and poor heat resistance of PLA, the prepared fibers have poor toughness, poor hand feeling, and insufficient dimensional stability, which limits its application in the textile field, especially in the high-end clothing field.
[0003] Chinese patent CN103069059A discloses a toughened polylactic acid fiber, in which toughening additives are added to PLA, and the internal morphology of the fiber is controlled by controlling the specific characteristics of these components and the methods of blending and melt spinning, and obtained Polylactic acid fibers with improved toughness, but the addition of tougheners will reduce the strength and heat resistance of the material, and there will be problems with the compatibility of tougheners and the matrix
This modification method has a long process and cumbersome process, which leads to high product cost, and multiple melt blending easily leads to the degradation of PLA and the deterioration of mechanical properties.

Method used

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  • Modified polylactic acid fiber and preparation method thereof
  • Modified polylactic acid fiber and preparation method thereof
  • Modified polylactic acid fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Example 1 Preparation of Modified Polylactic Acid Fiber

[0105] Put 1000g of poly-L-lactic acid, 110g of PDLA-PEG-PDLA block copolymer and 2g of antioxidant in a vacuum oven, dry at 80°C for 12h, and then blend to obtain a mixture. Wherein the antioxidant is antioxidant 1010 and antioxidant 168, and its ratio is 2:1.

[0106] Add the mixed material to the single-screw melt spinning equipment, extrude through the metering pump and the spinneret hole, collect the fiber at the spinning temperature of 230°C and the spinning speed of 400 m / min, and draw it at 90°C 3 times, and then heat-set at 105 ° C to obtain modified polylactic acid fibers.

[0107] Among them, the weight average molecular weight of poly-L-lactic acid is 100,000 Da, and the molar content of L optical isomer is 99%. In the PDLA-PEG-PDLA block copolymer, the molecular weight of poly-D-lactic acid is 50,000 Da, and the D optical isomer The molar content of the conformation is 99%, and the molecular weig...

Embodiment 2

[0108] Example 2 Preparation of Modified Polylactic Acid Fiber

[0109] 1000g of poly-L-lactic acid, 225g of PDLA-PCL block copolymer and 5g of antioxidant were dried in a vacuum oven at 120°C for 4 hours, and then blended to obtain a mixture. Wherein the antioxidant is antioxidant 1010 and antioxidant 168, and its ratio is 2:1.

[0110] Add the mixed material to the single-screw melt spinning equipment, extrude through the metering pump and the spinneret hole, collect the fiber at the spinning temperature of 270°C and the spinning speed of 800 m / min, and draw it at 90°C 3 times, and then heat-setting at 140 ° C to obtain modified polylactic acid fibers.

[0111] Among them, the weight-average molecular weight of poly-L-lactic acid is 200,000 Da, and the molar content of the L optical isomer is 95%. In the PDLA-PCL block copolymer, the molecular weight of poly-D-lactic acid is 100,000 Da, and the D optical isomer The molar content is 95%, and the molecular weight of PCL is...

Embodiment 3

[0112] Example 3 Preparation of Modified Polylactic Acid Fiber

[0113] Put 1000g of poly-L-lactic acid, 135g of PDLA-PBS block copolymer and 5g of antioxidant in a vacuum oven, dry at 40°C for 20h, and then blend to obtain a mixture. Wherein the antioxidant is antioxidant 1010 and antioxidant 168, and its ratio is 2:1.

[0114] The mixture is added to the single-screw melt spinning equipment, extruded through the metering pump and the spinneret hole, and the fibers are collected at a spinning temperature of 250°C and a spinning speed of 700 m / min, and drawn at 90°C 3 times, and then heat-setting at 120 ° C to obtain modified polylactic acid fibers.

[0115] Among them, the weight average molecular weight of poly-L-lactic acid is 150,000 Da, and the molar content of L optical isomer is 95%. In the PDLA-PBS block copolymer, the molecular weight of poly-D-lactic acid is 50,000 Da, and the molar content of D optical isomer The molar content is 95%, and the molecular weight of P...

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Abstract

The invention discloses a modified polylactic acid fiber which comprises the following components in parts by weight: 100 parts of poly-L-lactic acid, 1-25 parts of a poly-D-lactic acid segmented copolymer and 0.1-0.5 part of an antioxidant, wherein the poly-D-lactic acid segmented copolymer is a diblock copolymer PDLA-M or a triblock copolymer PDLA-M-PDLA which is formed by poly-D-lactic acid (PDLA) blocks and flexible blocks M; the modified polylactic acid fiber is prepared by melt spinning and through the following steps: step 1, drying and mixing poly-L-lactic acid, the poly-D-lactic acid segmented copolymer and the antioxidant to form a mixture; step 2, adding the mixture into melt spinning equipment, and collecting nascent fibers; step 3, sequentially performing heat drawing and heat setting on the nascent fibers. The modified polylactic acid fiber has a better mechanical property, higher heat resistance and good toughness, and at the same time the preparation method is simple and easy to implement, and facilitates large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a fiber, in particular to a modified polylactic acid fiber and a preparation method thereof. Background technique [0002] Polylactic acid PLA can be processed and manufactured from renewable resources such as corn starch, which reduces the dependence on traditional petroleum resources. The biodegradable polymer materials can be applied to clothing fabrics, textile materials and biomedical materials. At the same time, the fibers prepared from polylactic acid PLA have the advantages of both natural fibers and synthetic fibers. However, due to defects such as high brittleness, high hardness, and poor heat resistance of PLA, the prepared fibers have poor toughness, poor hand feeling, and insufficient dimensional stability, which limits its application in the textile field, especially in the high-end clothing field. [0003] Chinese patent CN103069059A disclose...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F8/14D01F1/10
CPCD01F1/10D01F6/92D01F8/14
Inventor 张秀芹王锐杨春芳梁宁宁李琦董振峰
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY