Preparation method of polylactic acid staple fibers

A technology of polylactic acid short fiber and polylactic acid, which is applied in fiber processing, fiber chemical characteristics, fiber bundles into fiber slivers/yarns, etc., can solve the problems of less research on fiber spinning production technology, and achieve good market application value , good air permeability and simple process route

Pending Publication Date: 2019-01-18
安徽丰原生物纤维股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What mainly adopt abroad is the melt direct spinning technology, and its process flow and process parameters are different from the slicing method adopted in the present invention, and the processing of polylactic acid is mostly plastic, and the production technology research of fiber spinning is less, In particular, the production of industrialized polylactic acid fibers is basically blank in China.

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
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation of embodiment 1 polylactic acid staple fiber (1)

[0026] (1) Pre-spinning step

[0027] Drum drying: add polylactic acid slices to a vacuum drum dryer, and dry at 95°C for 12 hours. The moisture content of the raw material after drying is measured to be 0.026%.

[0028] Melt spinning: The dried raw materials are transported to the screw extruder to be heated and melted, and the melt is filtered and spun through the spinning assembly to form primary fibers. The temperature of the screw and the spinning box during heating and melting is 239° C.; when filtering the melt, the filter precision is 20 μm to 25 μm, the filter screen is a composite filter screen of 50 mesh to 200 mesh, and the filter sand is sea sand of 20 mesh.

[0029] Cooling and forming: the raw fiber is cooled and formed by ring blowing. The wind pressure of the surrounding blower is 220Pa, the wind temperature is 19°C, and the wind speed is 1.2m / s;

[0030] Bundle oiling and barrel fall...

Embodiment 2

[0036] The preparation of embodiment 2 polylactic acid short fibers (2)

[0037] (1) Pre-spinning step

[0038] Drum drying: add polylactic acid slices to a vacuum drum dryer, and dry at 105°C for 11 hours. The water content of the raw material after drying is measured to be 0.024%.

[0039] Melt spinning: The dried raw materials are transported to the screw extruder to be heated and melted, and the melt is filtered and spun through the spinning assembly to form primary fibers. The temperature of the screw and spinning box during heating and melting is 244° C.; the filter precision is 20 μm to 25 μm when the melt is filtered, the filter screen is a composite filter screen of 50 mesh to 200 mesh, and the filter sand is sea sand of 20 mesh.

[0040] Cooling and forming: the raw fiber is cooled and formed by ring blowing. The wind pressure of the surrounding blower is 310Pa, the wind temperature is 21°C, and the wind speed is 1.6m / s;

[0041] Bundle oiling and barrel fall: the...

Embodiment 3

[0047] The preparation of embodiment 3 polylactic acid short fibers (3)

[0048] (1) Pre-spinning step

[0049] Drum drying: add polylactic acid slices to a vacuum drum dryer, and dry at 115°C for 12 hours. The moisture content of the raw material after drying is measured to be 0.02%.

[0050] Melt spinning: The dried raw materials are transported to the screw extruder to be heated and melted, and the melt is filtered and spun through the spinning assembly to form primary fibers. The temperature of the screw and spinning box during heating and melting is 249° C.; the filter precision is 20 μm to 25 μm when the melt is filtered, the filter screen is a composite filter screen of 50 mesh to 200 mesh, and the filter sand is sea sand of 20 mesh.

[0051] Cooling and forming: the raw fiber is cooled and formed by ring blowing. The wind pressure of the surrounding blower is 550Pa, the wind temperature is 22°C, and the wind speed is 2.1m / s;

[0052] Bundle oiling and barrel fall: t...

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
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PUM

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Abstract

The invention provides a preparation method of polylactic acid staple fibers. The method adopts fiber-grade polylactic acid (PLA) as a raw material, and the polylactic acid (PLA) staple fibers are prepared through vacuum drying, screw extrusion melting, spraying, cooling, bundling, drawing, heat treatment, tow crimping and cutting and other technological processes. The process route of the methodis simple, the prepared polylactic acid (PLA) staple fibers obtained after batched industrialization have excellent performance, the linear density of the staple fibers is 0.56-6.67 dtex, the demandsof knitting and weaving yarn for comprehensive indexes are fully met, and a high market application value is achieved.

Description

technical field [0001] The invention relates to the technical field of short fiber preparation, in particular to a preparation method of polylactic acid (PLA) short fiber. Background technique [0002] Polylactic acid (PLA) fiber is one of the "green fibers" with the greatest development prospects at present. It has the advantages of environmental protection, non-toxic, antibacterial, flame retardant, hypoallergenic, degradable, and renewable raw materials. Polylactic acid fiber has excellent physical properties and a wide range of uses. It has high dry and wet strength and initial modulus, and good dimensional stability. The fabric combines the comfort of cotton, the drape of viscose, the strength of polyester and the feel of silk. Excellent performance, widely used in clothing, fabrics, underwear, home textiles, sanitary materials, health care products and other fields. [0003] Polylactic acid resin can be obtained by ring-opening polymerization of lactide, or by direct ...

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
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/08D01D1/00D01D1/04D01D1/10D01G1/10D01F6/62
CPCD01D1/00D01D1/04D01D1/106D01D5/08D01F6/625D01G1/10
Inventor 马德金陈中碧杨阳谢贤勇
Owner 安徽丰原生物纤维股份有限公司
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