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High-heat-resistance skin-core structural polylactic acid fiber and preparation method thereof

A skin-core structure, heat-resistant technology, used in fiber processing, conjugated synthetic polymer rayon, textiles and papermaking, etc. It can only reach about 175 ℃ and other problems to achieve good heat resistance

Inactive Publication Date: 2017-05-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, PLA fibers with a low D-LA content as the core and PLA with a high L-LA content as the skin have appeared on the market. In order to ensure that the obtained PLA fibers with a skin-core structure are processed into non-woven materials and composite materials The material has a certain processing window, and the melting temperature of the skin needs to be much lower than the melting temperature of the core. Here, the melting temperature of the core can only reach about 175°C, so that the obtained skin-core structure PLA fiber and its corresponding non-woven material The heat resistance of composite materials is much lower than 175°C, which cannot meet the requirements for relatively high heat resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) First, dry and pre-crystallize stereocomplex polylactic acid (sc-PLA) and PLA with a D-LA content of 2mol% in a vacuum oven at 105°C for 24 hours for later use. The viscosity average of PLLA and PDLA in sc-PLA The molecular weights are 1.8×10 5 and 2.0×10 5 , the viscosity-average molecular weight of PLA is 2.2×10 5 .

[0016] (2) Add the dried PLA raw materials corresponding to the skin layer and the core layer into the hopper corresponding to the composite spinning machine, and convey through the melt——spinning—air cooling—winding feeding—oil bath stretching ——steam bath stretching—tension heat setting—oiling—filament lamination—crimping—relaxation—cutting process to obtain PLA short fibers with skin-core structure. The melt extrusion temperature of the skin layer is 200°C, The extrusion temperature is 240°C, the spinning speed is 300m / min, the first stretching temperature is 90°C, the stretching ratio is 4 times, the second stretching temperature is 120°C, and...

Embodiment 2

[0018] (1) First, dry and pre-crystallize stereocomplex polylactic acid (sc-PLA) and PLA with a D-LA content of 2mol% in a vacuum oven at 105°C for 24 hours for later use. The viscosity average of PLLA and PDLA in sc-PLA The molecular weights are 1.8×10 5 and 2.0×10 5 , the viscosity-average molecular weight of PLA is 2.2×10 5 .

[0019] (2) Add the dried PLA raw materials corresponding to the skin layer and the core layer into the hopper corresponding to the composite spinning machine, and convey through the melt——spinning—air cooling—winding feeding—oil bath stretching ——steam bath stretching—tension heat setting—oiling—filament lamination—crimping—relaxation—cutting process to obtain PLA short fibers with skin-core structure. The melt extrusion temperature of the skin layer is 200°C, The extrusion temperature is 240°C, the spinning speed is 300m / min, the first stretching temperature is 90°C, the stretching ratio is 4 times, the second stretching temperature is 120°C, and...

Embodiment 3

[0021] (1) First, dry and pre-crystallize stereocomplex polylactic acid (sc-PLA) and PLLA in a vacuum oven at 105°C for 24 hours for later use. The viscosity-average molecular weights of PLLA and PDLA in sc-PLA are 1.8×10 5 and 2.0×10 5 , the viscosity-average molecular weight of cortical PLLA is 1.8×10 5 .

[0022] (2) Add the dried PLA raw materials corresponding to the skin layer and the core layer into the hopper corresponding to the composite spinning machine, and convey through the melt——spinning—air cooling—winding feeding—oil bath stretching ——steam bath stretching—tension heat setting—oiling—filament lamination—crimping—relaxation—cutting process to obtain PLA short fibers with skin-core structure. The melt extrusion temperature of the skin layer is 200°C, The extrusion temperature is 240°C, the spinning speed is 200m / min, the first stretching temperature is 90°C, the stretching ratio is 4.5 times, the second stretching temperature is 120°C, and the second stretchin...

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Abstract

The invention discloses a high-heat-resistance skin-core structural polylactic acid (PLA) fiber and a preparation method thereof. The core layer of the skin-core structural PLA fiber is stereocomplex polylactic acid (scPLA), and the skin layer is PLA with the L-lactic acid structural unit (D-LA) content of 0 to 5 mol percent. The preparation method of the skin-core structural PLA fiber comprises the following steps: after raw materials are dried, adding the raw materials into corresponding hoppers of a composite spinning machine respectively, and carrying out melt conveying, spinning, blowing cooling, winding feeding, oil bath stretching, steam bath stretching, tension heat setting, oiling, stacking, curling, relaxation and cutting to prepare skin-core structural PLA short fiber; or after the raw materials are dried, adding the raw materials into the corresponding hoppers of the composite spinning machine respectively, and carrying out one step method of melt spinning, side blowing cooling, oiling, stretching and heat setting to prepare skin-core structural multifilaments. The prepared skin-core structural PLA fiber is relatively high in heat resistance, and can be used in the fields of textiles, composite materials and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to high heat-resistant sheath-core structure polylactic acid (PLA) fibers and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a renewable resource, biodegradable, and melt-processable. PLA fibers can be used as raw materials for non-woven materials to solve the problems of resource shortage and environmental pollution faced by the development of non-woven materials. Thermal bonding is a non-woven fabric. One of the main reinforcement methods in processing, however, for PLA fiber web, if it is thermally bonded, its performance will be seriously damaged, the main reason is: whether it is hot air bonding or hot rolling bonding, PLA fiber The orientation and crystalline structure of PLA will be destroyed. Due to the slow crystallization rate of PLA, the molten part mainly exists in an amorphous state after cooling, and is prone to physical aging, thu...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01D5/34
CPCD01F8/14D01D5/34
Inventor 刘庆生邓炳耀杨琪冰
Owner JIANGNAN UNIV
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