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Modified polylactic acid fiber and preparation method thereof

A technology of polylactic acid fiber and polylactic acid, applied in the field of modified polylactic acid fiber and its preparation, can solve the problems of thermal degradation of polylactic acid and affecting fiber strength, etc., achieve enhanced compatibility, improved performance, and simple production process Effect

Active Publication Date: 2016-01-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Extrusion at a temperature of 250°C to 300°C will cause thermal degradation of polylactic acid and seriously affect the strength of its fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The present invention designs the preparation method of fiber of the present invention simultaneously, and this preparation method adopts the mass percentage composition of modified polylactic acid fiber of the present invention and following process:

[0017] (1) First place the polylactic acid in an oven at 65~90°C, and dry it for 4~6 hours to fully remove the moisture in the polylactic acid; the polylactic acid is placed in an oven at 65~90°C for 4~6 hours before mixing. 6h, the moisture in polylactic acid can be fully removed. When the oven temperature is lower than 65°C or the drying time is less than 4 hours, the moisture in the polyemulsion will not be completely removed, and the residual moisture during high-temperature processing will cause the degradation of polylactic acid; Has reached constant weight, when the oven temperature is higher than 90°C or the drying time is longer than 6 hours, it will cause waste of time and electric energy, so it should not be u...

Embodiment 1

[0024] Dry polylactic acid and resin at 65°C for 6 hours respectively; take polylactic acid with a molecular weight of 70,000 and 98% of the total mass (in terms of mass percentage, the same below), and polyhydroxybutyric acid with a molecular weight of 50,000 and a melt index of 20 1% ester and 1% polyethylene adipate diethylene glycol ether ester, mix evenly, put the mixture into the twin-screw granulator, the set temperature and processing conditions of each zone of the twin-screw granulator are: 1 zone 130°C , the second zone is 140°C, the third zone is 150°C, the fourth zone is 170°C, the fifth zone is 165°C, the head is 170°C, the main screw speed is 120rpm, the barrel feeding speed is 6rpm, and the pressure is 10MPa. After melt blending, extrusion The modified polylactic acid particles were obtained by granulation, and the melt index of the modified polylactic acid particles prepared in this example was 25.3 (g / 10min) after testing.

[0025] The obtained modified polyla...

Embodiment 2

[0028] Dry polylactic acid and resin at 75°C for 5 hours respectively; take polylactic acid with a molecular weight of 90,000 and 88% of the total mass, polyhydroxybutyrate copolyester with a molecular weight of 30,000 and a melt index of 30, and polyhexamethylene 9% diethylene glycol ether diacid, mix evenly, and add the mixture into the twin-screw granulator; the temperature and processing conditions of each zone of the twin-screw granulator are: 135°C for the first zone, 160°C for the second zone, and 160°C for the third zone. zone 170°C, zone 4 180°C, zone 5 185°C, machine head 185°C, main screw speed 90rpm, barrel feeding speed 5rpm, pressure 9MPa, modified polymer through melt blending, extrusion and granulation Lactic acid granules. After testing, the melt index of the prepared modified polylactic acid particles was 41.5 (g / 10min).

[0029] After the obtained modified polylactic acid particles were vacuum-dried at 80°C for 9 hours, they were spun into coiled filaments ...

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Abstract

The invention discloses a modified polylactic acid fiber and a preparation method thereof. The fiber comprises the following components by mass percentage: 70-98% of polylactic acid, 1-15% of resin, and 1-15% of a modifier. The weight-average molecular weight of polylactic acid is 7-200 ten thousands. The resin is polytrimethylene terephthalate or / and polyhydroxyalkanoate. Polyhydroxyalkanoate is one or two of polyhydroxybutyrate, polyhydroxybutyrate-hydroxyvalerate, 3-hydroxybutyrate and 3-hydroxyhexanoate copolyester, polyhydroxyhexanoate and polyhydroxyoctoate, the weight average molecular weight of polyhydroxyalkanoate is 1-50 ten thousands, and the melt index is 20-50. The modifier is one or two of polydiethylene adipate glycol ester ether, diisononyl phthalate, (2-ethylhexyl)-difenylfosfat, cresyl diphenyl phosphate, tri(2-chloroethyl)phosphate and dioctyl adipate. The fiber has strength of greater than or equal to 1.5cN / dtex and elongation at break of greater than or equal to 40%.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a modified polylactic acid fiber and a preparation method thereof. Background technique [0002] Due to the dwindling of petroleum resources and the "white pollution" caused by petroleum-based polymer materials, countries have begun to pay more and more attention to the development of biodegradable polymer materials, especially the development of biodegradable polymers with renewable sources. material. Polylactic acid is a new type of fully degradable biopolymer material that is made from crops as the initial raw material through fermentation and polycondensation. It has the advantages of good biocompatibility, non-toxic, non-irritating, and completely degradable. It is currently the most One of the promising biodegradable polymer materials. [0003] Although polylactic acid materials have many advantages, polylactic acid materials also have certain shortcomings. For example, t...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10
Inventor 齐鲁张宝玉沈彪白立峰
Owner TIANJIN POLYTECHNIC UNIV
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