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Self-enhanced polylactic acid fiber and preparation method thereof

A technology of polylactic acid fiber and polylactic acid, which is applied in the direction of melt spinning, drawing spinning, and conjugated synthetic polymer artificial filament, can solve the problems of uneconomical and rising raw material costs, and achieve low boiling water shrinkage, High normal temperature mechanical strength, the effect of breaking through performance bottlenecks

Active Publication Date: 2012-08-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the formation of stereocomplex crystals in the known technology requires the same or close content of PLLA and PDLA, that is, the content of PDLA accounts for about 50% of the raw material, and the cost of PDLA is much higher than that of PLLA, so the cost of raw materials has increased significantly, which is very important. uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take L-polylactic acid with a weight-average molecular weight of 60,000 and a molar content of L optical isomer of 99% and D-polylactic acid with a weight-average molecular weight of 180,000 and a molar content of L optical isomer of 97% for vacuum drying. The temperature is 70±5°C, the drying time is 16 hours, and the vacuum degree is 100Pa; take 85 kg of dried L-polylactic acid and 15 kg of dried D-polylactic acid for physical mixing in a high-speed mixer; inject the mixture into a single Melted in the screw extruder, extruded through the metering pump and spinneret holes, the fibers were collected at a spinning temperature of 225°C and a spinning speed of 1000m / min, stretched 2.7 times at 90°C, and then stretched at 100°C Under heat setting, the tensile strength of the fiber measured at 25°C is 3.0cN / dtex, and the tensile strength of the fiber measured at 90°C is 1.1cN / dtex, measured according to the standard GB / T 6505 The boiling water shrinkage rate of the fiber is...

Embodiment 2

[0035] Take L-polylactic acid with a weight-average molecular weight of 180,000 and a molar content of L optical isomer of 98% and D-polylactic acid with a weight-average molecular weight of 300,000 and a molar content of L optical isomer of 99% for vacuum drying. The temperature is 70±5°C, the drying time is 16 hours, and the vacuum degree is 100Pa; take 99 kg of dried L-polylactic acid and 1 kg of dried D-polylactic acid and physically mix them in a high-speed mixer; pour the mixture into the unit Melted in the screw extruder, extruded through the metering pump and spinneret holes, the fibers were collected at a spinning temperature of 235°C and a spinning speed of 1500m / min, stretched at 100°C by 2.1 times, and then at 110°C Under heat setting, the tensile strength of the fiber measured at 25°C is 3.3cN / dtex, and the tensile strength of the fiber measured at 90°C is 1.2cN / dtex, measured according to the standard GB / T 6505 The boiling water shrinkage rate of the fiber is 6.8...

Embodiment 3

[0037] Take L-polylactic acid with a weight-average molecular weight of 300,000 and a molar content of L optical isomer of 91% and D-polylactic acid with a weight-average molecular weight of 240,000 and a molar content of L optical isomer of 95% for vacuum drying. The temperature is 70±5°C, the drying time is 16 hours, and the vacuum degree is 100Pa; take 92 kg of dried L-polylactic acid and 8 kg of dried D-polylactic acid for physical mixing in a high-speed mixer; inject the mixture into a single Melted in the screw extruder, extruded through the metering pump and spinneret holes, the fibers were collected at a spinning temperature of 245°C and a spinning speed of 2000m / min, drawn 1.6 times at 110°C, and then stretched at 120°C Under heat setting, the tensile strength of the fiber measured at 25°C is 3.6cN / dtex, and the tensile strength of the fiber measured at 90°C is 1.3cN / dtex, measured according to the standard GB / T 6505 The boiling water shrinkage rate of the fiber is 6....

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Abstract

The invention relates to a self-enhanced polylactic acid fiber and a preparation method thereof. The self-enhanced polylactic acid fiber provided by the invention is a uniform mixture of a vertical compound crystal polylactic acid micro-fiber and a polylactic acid substrate. In 100 weight parts of self-enhanced polylactic acid fiber, 1-30 parts of vertical compound crystal polylactic acid micro-fiber and 70-99 parts of polylactic acid substrate are contained. The preparation method of the fiber comprises the following steps: firstly, respectively carrying out vacuum drying on PLLA (poly L lactic acid) and PDLA (poly D lactic acid); physically mixing PLLA with PDLA after being dried; fusing the mixture; collecting primary fibers under the conditions that a spinning temperature is 225-245 DEG C and a spinning speed is 500-2500 meters per minute; and thermally drafting and thermally shaping the primary fibers. Compared with the common polylactic acid fiber, the self-enhanced polylactic acid fiber disclosed by the invention has the advantages of higher constant temperature mechanical strength, higher high temperature mechanical strength and lower boiling water shrinkage, so that the use demand is met and the application field is expanded.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a self-reinforced polylactic acid fiber and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) fibers are mainly made of natural renewable resources, which reduces the dependence on non-renewable resources such as petroleum, and at the same time has excellent mechanical properties and degradability. With people's increasing attention to the environment, the scale and cost reduction of PLA synthesis, and the continuous expansion of its application fields, PLA fiber will surely become one of the important fiber varieties, and it is expected to replace traditional polypropylene, polyester and nylon in many fields. Chemical fiber material. [0003] Since the 1960s and 1970s, various spinning methods including wet method, dry method, dry-wet method and melt spinning have been successively used to prepare PLA fibers. Among them, melt spinning ha...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01D5/08D01D5/12D01D10/02
Inventor 陈鹏魏文锋顾群陈力
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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