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Method for direct preparation of fiber product from polylactic acid polymerized melt

A fiber product, polylactic acid technology, applied in the application field of new polymer materials, can solve problems such as restricting the industrialization process of fiber products, and achieve the effect of ensuring spinnability, quality, and less equipment investment

Active Publication Date: 2007-12-12
李振华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is the shackles of this traditional thinking that restricts the industrialization process of preparing fiber products from polylactic acid polymer melts.

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 fiber product from polylactic acid polymerized melt
  • Method for direct preparation of fiber product from polylactic acid polymerized melt
  • Method for direct preparation of fiber product from polylactic acid polymerized melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Please refer to Fig. 2, the main raw material lactide (LA) and trace initiator are prepared polylactic acid polymerization reaction device ring-opening polymerization reaction such as disclosed by Chinese patent CN1884337A, CN1884338A and when the end of the reaction in the termination device Add a small amount of end-capping agent, heat stabilizer and acid scavenger, and the viscous polymer obtained after the reaction is completed at a process temperature of 235°C, that is, polylactic acid polymer melt, passes through a discharge pump 2 connected to the final device 1 The melt conveyor with a linear distance of 180m between the outlet of the outlet and the inlet of the spinning box 8 heats the polylactic acid polymer melt and keeps it at 235°C and continuously introduces it into the spinning box 8 at a pressure of >2MPa. , the continuously introduced polylactic acid melt is continuously spun by a spinning box 8 to obtain a fiber product 9 . For the discharge pump 2, it...

Embodiment 2

[0032] See Figure 3. From the discharge pump 2 connected to the finishing device 1, the polylactic acid polymerized melt with a temperature of 210°C obtained after the polymerization reaction of the polymerization reaction device is terminated is directly sent to the spinning through the melt conveying pipe 4 with a linear distance of 20 meters. Box 8, the temperature of the spinning box is controlled at about 210 ° C, the temperature of the heat transfer oil in the spacer 5 is the same as the temperature of the polylactic acid polymer melt, and the fiber products spun from the spinning box 8, that is, the polylactic acid fiber products, are processed through the subsequent process. After the process is oiled, it is continuously drawn by the feeding roller to the drafting hot roller, and after being drawn 3 to 6 times, it is continuously wound up on the bobbin of the winding system to become FDY filament or undergo air deformation treatment to become BCF filament. It can be di...

Embodiment 3

[0034] See Figure 4. The polylactic acid polymerized melt with a temperature of 220°C obtained after the polymerization reaction of the polymerization reaction device is terminated by the discharge pump 2 connected to the final device 1 is directly sent to the spinning through the melt conveying pipe 4 with a linear distance of 100 meters. Box 8, the temperature of the spinning box body is controlled at about 220°C, the outer wall of the spacer 5 is wound with an electric heating ribbon 15 with sufficient power as an electric heating element, and the outer surface of the electric heating ribbon 15 is covered by the first thermal insulation material 13, and the outer wall of the spacer 5 The cavity 12 is filled with heat transfer oil 19. When the heat transfer oil heats up, due to the volume change due to thermal expansion, the expanded heat transfer oil 19 enters the high-level expansion tank 18 through the pipeline 17 through the overflow port 16 communicating with the spacer ...

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Abstract

A directive preparing method of fiber products through polylactic acid polymeric welding flux belongs to high polymer materials application technology. It heats the polylactic acid polymeric welding flux which is prepared through the polymerization reaction in the polylactic acid polymerization reaction device by means of a welding flux conveyer which is connected between the discharge port of termination device discharge pump of polylactic acid polymerization reaction device and the feeding inlet of spinning runk, and guides the polylactic acid polymeric welding flux into spinning runk in positive pressure and thermal insulation state, then the spinning runk spins the guided polylactic acid polymeric welding flux and prepares fabric products. The advantages are: it avoids the impact of spinning performance caused by dry, it ensures spinning performance and also ensures the quality of fiber products; the polylactic acid polymeric welding flux is guided into spinning runk to spin from discharge pump and through welding flux conveyer, so the technology process is very simple and easy, the equipment investment is less; due to no granulating, dewatering, drying, screw bolt squeezing and melting, energy consumption can be saved more than one third, it is useful for reducing the cost of fiber products.

Description

technical field [0001] The invention relates to a method for directly preparing fiber products from a polylactic acid polymer melt, and belongs to the technical field of new polymer materials applications. 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 preparation processes. It was officially industrialized in the United States in 2002. The academic name is abbreviated as PLA. my country is in the research and development stage. Has not yet entered industrial production. [0003] At present, individual manufacturers in China are trying to prepare fiber products from the polylactic acid polymer melt obtained by the polymerization reaction of the polymerization device. The method is as follows: first, the main raw material is lactide (LA) and the initiator is put into the polylactic acid polymerization reaction Device ring-opening ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62D01D5/08C08G63/08D04H1/00D04H3/00D04H3/011D04H3/14
Inventor 李振华
Owner 李振华
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