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Profiled polylactic acid fiber and preparation method thereof

A technology of special-shaped polylactic acid and polylactic acid, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of reduced mechanical properties and uneven structure of special-shaped polylactic acid fibers, and achieves high production efficiency. Excellent mechanical properties and uniform structure

Active Publication Date: 2009-12-23
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

[0005] The second technical problem to be solved by the present invention is to provide a preparation method of special-shaped polylactic acid fibers, which improves the conventional melt spinning method, and at a higher spinning speed and a lower thermal draw ratio Special-shaped polylactic acid fibers with excellent performance can be produced under certain conditions to solve the problems of uneven structure and mechanical properties of special-shaped polylactic acid fibers produced by conventional melt spinning processes or must be processed at a very high spinning speed and thermal drawing ratio The problem that polylactic acid fibers with better mechanical properties can only be produced under certain conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The L-isomer in the polylactic acid chip was 98 mol%, the D-isomer was 2 mol%, and the weight average molecular weight (Mw) was 80,000. Prepare the fiber according to the following steps: (1) Vacuum dry the chips at a temperature of 60±5°C for 16 hours and a vacuum of 100 Pa; (2) Melt the chips with a single-screw extruder, pass through a metering pump and special-shaped spinneret holes Extruded into fibers, the shape of the spinneret hole is C-shaped or round hollow or trilobal or cross-shaped or triangular, and the temperature is 200 ° C; (3) The fiber passes through a liquid-phase constant temperature bath, the temperature of the constant temperature bath is 80 ° C, and the fiber is immersed in The depth is 30cm, and the liquid surface on the constant temperature bath is 60cm away from the spinneret hole; (4) the spinning speed is 1500m / min to obtain undrawn silk; (5) drawing at 90°C, the draw ratio is 2.0; ( 6) Heat treatment at a temperature of 110°C. The properti...

Embodiment 2

[0021] The polylactic acid content in the polyterephthalic acid-adipic acid-ethylene glycol-polylactic acid copolymer chip is 15 mol%, and the weight average molecular weight (Mw) is 60,000. Prepare the fiber according to the following steps: (1) Vacuum dry the chips at a temperature of 60±5°C for 16 hours and a vacuum of 100 Pa; (2) Melt the chips with a single-screw extruder, pass through a metering pump and special-shaped spinneret holes Extruded into fibers, the shape of the spinneret hole is C-shaped or round hollow or trilobal or cross-shaped or triangular, and the temperature is 210°C; (3) The fiber passes through a liquid-phase constant temperature bath, and the temperature of the constant temperature bath is 80°C, and the fiber is immersed in The depth is 20cm, and the liquid level on the constant temperature bath is 70cm away from the spinneret hole; (4) the spinning speed is 1000m / min to obtain undrawn silk; (5) draw at 90°C, and the draw ratio is 2.0; ( 6) Heat tre...

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Abstract

The invention discloses a profiled polylactic acid fiber and a preparation method thereof. Cross section of the profiled polylactic acid fiber can be of C shape, hollow circular shape, trilobal shape, cross shape and triangular shape; and compared with common circular polylactic acid fiber, the profiled polylactic acid fiber has good hydrophilicity, bulkiness, flexibility, luster and excellent mechanical properties. The invention also discloses a preparation method of the profiled polylactic acid fiber. The profiled polylactic acid fiber with uniform structure and excellent mechanical properties is prepared by using profiled spinneret orifices in the melt spinning process at moderate spinning speed, lower heat stretching and heat treatment temperature, stretching ratio and mild melt spinning process conditions in a liquid phase thermostatic bath by improving spinning dynamics.

Description

technical field [0001] The invention relates to a special-shaped polylactic acid fiber and a preparation method thereof, belonging to the technical field of chemical fibers. Background technique [0002] Polylactic acid (L-polylactic acid, D-polylactic acid, D, L-polylactic acid and blends and copolymers containing polylactic acid) fibers are mainly made of natural renewable resources, reducing the need for non-renewable resources such as Petroleum dependence, while having excellent mechanical and degradable properties. With people's increasing attention to the environment, the scale and cost reduction of polylactic acid synthesis, and the continuous expansion of the application field of polylactic acid fibers, polylactic acid fibers will surely become one of the most important fiber varieties and are expected to be used in many application fields. Instead of traditional fiber materials such as polypropylene, polyester and nylon. [0003] However, in practical applications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/24D01D5/253D01D10/00D01D10/02D01D11/00D02J1/22D01F6/84D01F6/62D01F6/92D01F8/14
Inventor 陈鹏顾群王宗宝蒋志强黎俊严庆
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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