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Method for direct preparation of coloured polylactic acid fiber by polylactic acid polymer melt

A technology of colored polylactic acid and polylactic acid, which is applied to single-component polyester rayon, adding pigments to spinning solution, adding dyes to spinning solution, etc., can solve the problem of environmental damage, low temperature resistance, Constraints and other issues to achieve the effect of ensuring consistency, avoiding color difference, and preventing damage

Inactive Publication Date: 2009-12-09
恒天长江生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since polylactic acid fiber is a new material, the dyeing of polylactic acid fiber and the dyeing and finishing of the fabric obtained by polylactic acid fiber are still in the stage of exploration, and there is no open technical information that can be used for reference in the literature. , making dyeing and finishing difficult
If the traditional dyeing process for polyester fiber, nylon fiber, polyester-nylon composite fiber or cotton fiber is simply applied to the dyeing of polylactic acid fiber, then, due to the low temperature resistance of polylactic acid fiber, the dyeing process parameters For example, the temperature change is very sensitive and the process requirements are very harsh, especially the dyeing and finishing treatment of polylactic acid fiber woven fabrics is more difficult, which greatly restricts the ability to be degradable to reflect environmental protection and resources. The popularization and application of polylactic acid fibers that reflect the saving of non-renewable resources (such as petroleum) due to their regeneration
[0004] In addition to the above-mentioned factors, even if people master the dyeing of polylactic acid fibers and the mature technology of dyeing textile fabrics or non-woven fabrics obtained from polylactic acid fibers in the future (later) after overcoming difficulties, they will still face the following problems: The confusion above is the problem of energy and environmental pollution, because dyeing, dyeing and finishing must rely on water, electricity and gas, resulting in a large amount of energy consumption; and because dyeing, dyeing and finishing will inevitably produce pollutants, which will damage the environment

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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  • Method for direct preparation of coloured polylactic acid fiber by polylactic acid polymer melt
  • Method for direct preparation of coloured polylactic acid fiber by polylactic acid polymer melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 , from the end of the polymerization reaction of the polylactic acid polymerization reaction device, a viscous polymer with a process temperature of 170 ° C is obtained. This polymer is the off-white polylactic acid polymerization melt. The first discharge pump 2 at the discharge port of the polylactic acid polymerization melt post-processing device, that is, the termination device 1, is connected between the discharge port of the first discharge pump 2 and the feed port 11 of the melt mixing device 5 The first melt delivery pipeline 9 is continuously transported to the melt mixing device 9 with a positive pressure of 35 MPa at a process temperature of 170 ° C and maintained at 170 ° C. At the same time, the screw extruder 3 The second discharge pump 4 at the discharge port of the screw extruder passes the colored polylactic acid melt with the same process temperature of 170 ° C after the polylactic acid color masterbatch is thermally melted by the screw ex...

Embodiment 2

[0029] see figure 2 , the process temperature is 190 ℃ from the end of the polymerization reaction of the polylactic acid polymerization reaction device to obtain a viscous polymer with a process temperature of 190 ° C. This polymer is the off-white polylactic acid polymerization melt. The first discharge pump 2 at the discharge port of the polylactic acid polymerization melt post-processing device, that is, the termination device 1, is connected between the discharge port of the first discharge pump 2 and the feed port 11 of the melt mixing device 5 The first melt delivery pipeline 9 is continuously transported to the melt mixing device 9 with a positive pressure of 20 MPa at a process temperature of 190 ° C and maintained at 190 ° C. At the same time, the screw extruder 3 The second discharge pump 4 at the discharge port of the screw extruder passes the colored polylactic acid melt with the same process temperature of 190 ° C after the polylactic acid color masterbatch is t...

Embodiment 3

[0034] see figure 1 A viscous polymer with a process temperature of 250°C is obtained from the polymerization reaction of the polylactic acid polymerization reaction device. This polymer is the off-white polylactic acid polymerization melt. The first discharge pump 2 at the discharge port of the polylactic acid polymerization melt post-processing device, that is, the termination device 1, is connected between the discharge port of the first discharge pump 2 and the feed port 11 of the melt mixing device 5 The first melt conveying pipeline 9 is continuously transported to the melt mixing device 9 with a positive pressure of 10 MPa at a process temperature of 250 ° C and maintained at 250 ° C. At the same time, the screw extruder 3 The second discharge pump 4 at the discharge port of the screw extruder passes the colored polylactic acid melt with the same process temperature of 250 ° C after the polylactic acid color masterbatch is thermally melted by the screw extruder through ...

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Abstract

The invention relates to a method for direct preparation of coloured polylactic acid fiber by polylactic acid polymer melt, belonging to the technical field of high polymer material application. The method comprises the following steps: conveying raw white polylactic acid polymer melt obtained from polymerization reaction in a polylactic acid polymerization reaction device to a melt mixing device through a termination device of the polylactic acid polymerization reaction device; mixing the raw white and colored polylactic acid melt in the melt mixing device to obtain colored polylactic acid mixed melt; leading the colored polylactic acid mixed melt into a spinning tank to be spun to obtain colored polylactic acid fiber. The method of the invention has the following advantages: avoiding causing chromatic aberration in the process of dying fiber or fabrics; saving energy, and preventing waste water generated by printing from polluting the environment; saving resources, and avoiding causing damage to the soil and water source after abandonment of the coloured polylactic acid fiber; providing technical guarantees for promotion and application of the polylactic acid fiber and products produced therewith.

Description

technical field [0001] The invention belongs to the technical field of polymer material application, and in particular relates to a method for directly preparing colored polylactic acid fibers from polylactic acid polymer melts. Background technique [0002] Polylactic acid is a new biodegradable polymer material that uses renewable corn or glucose as the initial raw material and is finally polymerized through multiple processes. It was officially industrialized in the United States in 2002. Its academic name is PLA. my country is still in the research and development stage and has not yet entered Industrial production. [0003] At present, although the amount of polylactic acid fibers used in my country is not very large, they are all imported from abroad, and they are all sliced ​​and spun filaments or short fibers, and the color is all off-white. As is well known in the textile industry, since most fabrics (including non-woven fabrics) need to be matched in various colors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/04D01F1/06D04H3/16
Inventor 李振华
Owner 恒天长江生物材料有限公司
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