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Preparation method of high molecular weight R-polylactic acid-low molecular weight L-polylactic acid mixing fiber and product

A technology of right-handed polylactic acid and left-handed polylactic acid, which is applied in the direction of conjugated synthetic polymer artificial filament, melt spinning method, stretch spinning method, etc., can solve the problem of difficult to obtain PLA fiber, slow crystallization of polylactic acid, and affecting performance and other issues, to achieve the effect of promoting the generation of shish, controllable production process, and improving thermal stability

Active Publication Date: 2017-10-27
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at this stage, due to the slow crystallization of polylactic acid, it is still difficult to obtain PLA fibers with high crystallinity (55-60%) even under the force of a strong tensile flow field during the spinning process.
The poor thermal stability caused by low crystallinity (20-30%) seriously affects its performance

Method used

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  • Preparation method of high molecular weight R-polylactic acid-low molecular weight L-polylactic acid mixing fiber and product
  • Preparation method of high molecular weight R-polylactic acid-low molecular weight L-polylactic acid mixing fiber and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the weight average molecular weight as 5×10 5 g / mol HPDLA with a weight average molecular weight of 1.5×10 5 g / mol of LPLLA as starting material.

[0029] Dissolve 10g of HPDLA and 10g of LPLLA in 150ml of dichloromethane, stir magnetically for 3 hours at room temperature, pour the mixed solution into 50ml of absolute ethanol while stirring to obtain a precipitate with a mass ratio of HPDLA / LPLLA of 1:1, and place it in a vacuum oven Dry to obtain the masterbatch.

[0030] 10g of the above-mentioned masterbatch and 40g of LPLLA were melt-extruded and granulated in a micro-extruder at 240°C to obtain a HPDLA / LPLLA blend;

[0031] The blend was melt-spun at a spinning temperature of 240°C, a winding speed of 100m / min, a hot drawing temperature of 100°C, and a draw ratio of 2 times to obtain PLA blended fibers.

[0032] Specific test methods: 1) Use a single fiber heat shrinkage tester to test the hot air shrinkage rate of PLA blended fibers. The test temperature i...

Embodiment 2

[0038] Take the weight average molecular weight as 10×10 5 g / mol HPDLA with a weight average molecular weight of 1.5×10 5 g / mol of LPLLA as starting material.

[0039] Dissolve 10g of HPDLA and 10g of LPLLA in 150ml of dichloromethane, stir magnetically for 3 hours at room temperature, pour the mixed solution into 50ml of absolute ethanol while stirring to obtain a precipitate with a mass ratio of HPDLA / LPLLA of 1:1, and place it in a vacuum oven Dry to obtain the masterbatch.

[0040] 10g of the above-mentioned masterbatch and 40g of LPLLA were melt-extruded and granulated in a micro-extruder at 240°C to obtain a HPDLA / LPLLA blend;

[0041] The blend was melt-spun at a spinning temperature of 250°C, a winding speed of 120m / min, a hot drawing temperature of 120°C, and a draw ratio of 2.5 times to obtain PLA blended fibers.

[0042] The test method of shrinkage in hot air and shrinkage in boiling water is the same as in Example 1.

[0043] The hot air shrinkage rate of the ...

Embodiment 3

[0045] Take the weight average molecular weight as 10×10 5 g / mol HPDLA with a weight average molecular weight of 1.5×10 5 g / mol of LPLLA as starting material.

[0046]Dissolve 10g of HPDLA and 10g of LPLLA in 150ml of dichloromethane, stir magnetically for 3 hours at room temperature, pour the mixed solution into 50ml of absolute ethanol while stirring to obtain a precipitate with a mass ratio of HPDLA / LPLLA of 1:1, and place it in a vacuum oven Dry to obtain the masterbatch.

[0047] 10g of the above-mentioned masterbatch and 40g of LPLLA were melt-extruded and granulated in a micro-extruder at 220°C to obtain a HPDLA / LPLLA blend;

[0048] The blend was melt-spun at a spinning temperature of 255°C, a winding speed of 200m / min, a hot drawing temperature of 120°C, and a draw ratio of 3.5 times to obtain PLA blended fibers.

[0049] The test method of shrinkage in hot air and shrinkage in boiling water is the same as in Example 1.

[0050] The hot air shrinkage rate of the P...

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Abstract

The invention relates to a preparation method of high molecular weight R-polylactic acid and low molecular weight L-polylactic acid mixing fiber. The preparation method comprises the following steps of (1) melting and mixing the high molecular weight R-polylactic acid and the low molecular weight L-polylactic acid, extruding and granulating, so as to obtain a mixture, wherein the mass fraction of the high molecular weight R-polylactic acid is 5 to 50%, and the mass fraction of the low molecular weight L-polylactic acid is 50 to 95%; (2) melting and spinning the mixture, so as to obtain the high molecular weight R-polylactic acid-low molecular weight L-polylactic acid mixing fiber. The invention also relates to a product prepared by the preparation method. The preparation method has the advantages that the process is simple, and the production technology is controllable; the prepared polylactic acid mixing fiber contains rich shish-kebab superlattice structure, the crystallizing degree is 40 to 60%, the shrinkage rate in dry and hot air is 3.0 to 6.0%, and the shrinkage rate in boiled water is 0.3 to 2.0%.

Description

technical field [0001] The invention relates to the field of preparation of polylactic acid fibers, in particular to a preparation method and product of high-molecular-weight D-polylactic acid-low-molecular-weight L-polylactic acid blended fibers. Background technique [0002] Polylactic acid (Poly Lactic Acid, PLA) is a new type of polyester material obtained by hydrolysis and fermentation of various renewable natural resources such as starch, cellulose, polysaccharides, and polymerization. It is a completely degradable environmental friendly resin. [0003] Polylactic acid has excellent biocompatibility, good mechanical properties and physical properties, making it widely used in packaging, biomedical, automotive electronics and other fields, and also has potential application value in chemical fiber and nonwoven fields. [0004] But at this stage, due to the slow crystallization of polylactic acid, it is still difficult to obtain PLA fibers with high crystallinity (55-60...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01D5/08D01D5/12D01D10/02
CPCD01D5/08D01D5/12D01D10/02D01F8/14
Inventor 苏娟娟韩建孟扬朱凡
Owner ZHEJIANG SCI-TECH UNIV
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