A stereotactic polylactic acid/polytrimethylene carbonate biomass composite fiber

A methyl carbonate and composite fiber technology, applied in the direction of fiber chemical characteristics, conjugated synthetic polymer artificial filament, textiles and papermaking, can solve the problems of poor toughness, poor heat resistance and toughness of PLA fiber, and achieve Excellent hydrolysis resistance, excellent heat resistance, and excellent biodegradability

Active Publication Date: 2022-03-08
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PLA fiber is not only derived from biomass, but also completely biodegradable, but PLA fiber has poor heat resistance and toughness
Stereotactic polylactic acid (sc-PLA) fibers were prepared by melt-spinning blends of left-handed polylactic acid (PLLA) and right-handed polylactic acid (PDLA), which showed significantly improved heat resistance but still poor toughness

Method used

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  • A stereotactic polylactic acid/polytrimethylene carbonate biomass composite fiber
  • A stereotactic polylactic acid/polytrimethylene carbonate biomass composite fiber
  • A stereotactic polylactic acid/polytrimethylene carbonate biomass composite fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Dry sc-PLA and PTMC with a weight average molecular weight of 300,000;

[0036] Get each 50g of dried sc-PLA and PTMC, inject sc-PLA and PTMC into twin-screw extruder and melt blend, extrude granulation to obtain sc-PLA / PTMC blend;

[0037] Among them: the blending temperature is 240°C, and the blending time is 10 minutes;

[0038] (2) The sc-PLA / PTMC mixture was injected into the extruder to melt and extrude, and the as-spun fibers were collected. The temperature of the screw zone was 250°C, the temperature of the spinneret was 240°C, and the spinning speed was 600m / min;

[0039] (3) Draw the as-spun fiber 5 times at 120°C;

[0040] (4) Heat-treat the stretched sc-PLA / PTMC fiber at 190°C for 40 min under a tension of 0.3 cN / dtex to obtain the sc-PLA / PTMC biomass composite fiber;

[0041] The fiber only has a melting peak around 222°C as measured by a differential scanning calorimeter, see figure 1 .

[0042] The melting point of the sc-PLA / PTMC biomass composit...

Embodiment 2

[0044] (1) Dry sc-PLA and PTMC with a weight average molecular weight of 300,000;

[0045] Get dried sc-PLA 80g and PTMC 20g, inject sc-PLA and PTMC into twin-screw extruder and melt blend, extrude granulation to obtain sc-PLA / PTMC blend;

[0046] Among them: the blending temperature is 250°C, and the blending time is 6 minutes;

[0047] (2) The sc-PLA / PTMC mixture is injected into the extruder to melt and extrude, and the as-spun fibers are collected. The temperature of the screw zone is 240°C, the temperature of the spinneret is 240°C, and the spinning speed is 800m / min;

[0048] (3) Draw the as-spun fiber 6 times at 140°C;

[0049] (4) Heat-treat the stretched sc-PLA / PTMC fiber at 200°C for 20 min under a tension of 0.3 cN / dtex to obtain the sc-PLA / PTMC biomass composite fiber;

[0050] The fiber only has a melting peak around 227°C as measured by a differential scanning calorimeter, see figure 2 .

[0051] The melting point of the sc-PLA / PTMC biomass composite fiber i...

Embodiment 3

[0053](1) Dry sc-PLA and PTMC with a weight average molecular weight of 200,000;

[0054] Get dried sc-PLA 90g, PTMC 10g and tributyl citrate 5g, inject sc-PLA and PTMC into twin-screw extruder and melt blend, extrude granulation to obtain sc-PLA / PTMC blend;

[0055] Among them: the blending temperature is 250°C, and the blending time is 8 minutes;

[0056] (2) The sc-PLA / PTMC mixture is injected into the extruder to melt and extrude, and the as-spun fibers are collected. The temperature of the screw zone is 260°C, the temperature of the spinneret is 250°C, and the spinning speed is 1000m / min;

[0057] (3) Draw the nascent fiber 4 times at 130°C;

[0058] (4) Heat-treat the stretched sc-PLA / PTMC fiber at 205°C for 10 min under a tension of 0.3 cN / dtex to obtain the sc-PLA / PTMC biomass composite fiber;

[0059] The fiber only appears a melting peak around 226°C as measured by a differential scanning calorimeter, see image 3 .

[0060] The melting point of the sc-PLA / PTMC b...

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Abstract

The invention discloses a stereotactic polylactic acid (sc-PLA) / polytrimethylene carbonate (PTMC) biomass composite fiber and a preparation method thereof. The sc-PLA / PTMC biomass composite fiber is sc-PLA and PTMC Blended melt spinning, the melting peak temperature is above 200°C when measured by differential scanning calorimeter, the crystal diffraction peak 2θ=12°, 16°, 21°, 24° is measured by XRD, and the degree of crystallinity is 20~ 70%. The melting temperature, breaking strength and elongation at break of the sc-PLA / PTMC biomass composite fiber prepared by the present invention are all much higher than ordinary PLA fibers; the biomass composite fiber is drawn after being hydrolyzed in a solution of pH 5 at 130°C for 1 hour The tensile strength retention rate is 65%~96%, which is much higher than ordinary PLA fibers. The composite fiber processing method has simple process, is easy to process, has excellent product performance, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of composite fibers, and in particular relates to a stereotactic polylactic acid / polytrimethylene carbonate biomass composite fiber. Background technique [0002] China is a big textile country that needs a lot of fiber raw materials every year. In 2017, the global fiber consumption was 103 million tons, of which synthetic fibers accounted for about 70%. The side effects of traditional petrochemical technology and products and the current synthetic fibers mainly use petroleum resources as raw materials. With the increasing scarcity of global oil resources and the deterioration of the ecological environment, the unsustainability is becoming more and more obvious, and the development of synthetic fibers is subject to more and more restrictions. Vigorously developing biomass fibers can effectively expand the source of textile raw materials and make up for the shortage of domestic textile resources. It is also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/14D01F1/10
CPCD01F8/14D01F1/10
Inventor 潘刚伟赵士友杨先耿姚理荣徐思峻
Owner NANTONG UNIVERSITY
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