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High-strength slurry-free polylactic acid yarn and preparation method thereof

A polylactic acid, yarn technology, applied in the direction of yarn, filament/thread forming, conjugated synthetic polymer rayon, etc., can solve problems such as resource consumption, reduce surface hairiness, increase cohesion, and simple preparation process Effect

Inactive Publication Date: 2020-03-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to develop a high-strength sizing-free polylactic acid yarn and provide a preparation method for the raw materials of synthetic fibers derived from petroleum and the environmental and resource consumption problems caused by sizing and desizing

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (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 .

[0020] (2) Add the PLA raw materials corresponding to the skin layer and the core layer into the corresponding hopper of the composite spinning machine, and convey through the melt——spinning—blow cooling—winding feeding—oil bath stretching—steam Bath stretching - tension heat setting - oiling - lamination - crimping - relaxation - cutting process to obtain PLA short fibers with skin-core structure, the melt extrusion temperature of the skin layer is 210 ° C, and the melt extrusion temperature of the core layer The temperature is 230°C, the spinning speed is 1000m / min, the first stretching temperature is 90°C, the first stretching ratio is 5 times,...

Embodiment 2

[0023] (1) First, dry PLLA (with a D-LA content of 0) and PLA with a D-LA content of 10mol% in a vacuum oven at 80°C for 24 hours for later use. The viscosity-average molecular weights of PLLA and PLA are 1.8× 10 5 and 1.5×10 5 .

[0024] (2) Add the PLA raw materials corresponding to the skin layer and the core layer into the corresponding hopper of the composite spinning machine, and convey through the melt——spinning—blow cooling—winding feeding—oil bath stretching—steam Bath stretching - tension heat setting - oiling - lamination - crimping - relaxation - cutting process to obtain PLA short fibers with skin-core structure, the melting extrusion temperature of the skin layer is 180 ° C, and the melting extrusion temperature of the core layer is The spinning speed is 230°C, the spinning speed is 1500m / min, the first stretching temperature is 75°C, the first stretching ratio is 4 times, the second stretching temperature is 95°C, the second stretching ratio is 2 times, and th...

Embodiment 3

[0027] (1) First, dry and pre-crystallize stereocomplex polylactic acid (sc-PLA) and L-polylactic acid PLLA (D-LA content is 0) in a vacuum oven at 105°C for 24 hours for later use. PLLA and PDLA in sc-PLA The viscosity average molecular weight is 1.8×10 5 and 2.0×10 5 , the viscosity-average molecular weight of PLA is 2.2×10 5 .

[0028] (2) Add the PLA raw materials corresponding to the skin layer and the core layer into the corresponding hopper of the composite spinning machine, and convey through the melt——spinning—blow cooling—winding feeding—oil bath stretching—steam Bath stretching - tension heat setting - oiling - lamination - crimping - relaxation - cutting process to obtain PLA short fibers with skin-core structure, the melt extrusion temperature of the skin layer is 220 ° C, and the melt extrusion temperature of the core layer The temperature is 230°C, the spinning speed is 1000m / min, the temperature of the first stretch is 85°C, the draw ratio of the first stret...

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Abstract

The invention discloses high-strength slurry-free polylactic acid (PLA) yarn and a preparation method thereof. The high-strength slurry-free PLA yarn is formed by PLA staple fibers with the linear density of 1.3-7.7 dtex and the length of 25-150 mm; and the PLA staple fiber is provided with a skin-core structure, a skin layer is low-melting-point PLA, a core layer is high-melting-point PLA, and amass ratio of the skin layer to the core layer is 5: 90-50: 50. The preparation method of the high-strength slurry-free PLA yarn comprises the following steps of drying raw materials of the skin layerand the core layer, respectively adding the raw materials into a hopper corresponding to a composite spinning machine, and carrying out melt conveying, spinning, air blast cooling, winding and feeding, oil bath stretching, steam bath stretching, tension heat setting, oiling, laminating, curling, loosening, and cutting processes to obtain the PLA staple fiber of the skin-core structure; and carrying out spinning with the PLA staple fibers of the skin-core structure as the raw material in order to prepare the PLA yarn, enabling the PLA yarn to pass through a pair of heating rollers and carryingout heating and pressure treatment on the PLA to prepare the high-strength slurry-free yarn, wherein the heating temperature is higher than the melting point of the PLA of the skin layer and is lowerthan the melting point of the PLA of the core layer; through the adhesion effect of the skin layer, the hairiness is reduced, the cohesive force between the fibers is increased, and the high strengthand free slurry of the yarn are realized. The prepared high-strength slurry-free PLA yarn can be used in the fields of textiles for clothing, textiles for decoration and industrial textiles.

Description

technical field [0001] The invention relates to the field of textiles, in particular to high-strength sizing-free polylactic acid yarn and a preparation method thereof. Background technique [0002] The textile industry is a pillar industry of my country's national economy, an important livelihood industry, and an industry with obvious international competitive advantages. It is also an integral part of strategic emerging industries and an important carrier of national cultural inheritance. The raw material of synthetic fibers mainly comes from petroleum, which is a non-renewable resource. After 50 years, it will face the problem of resource depletion. Most petroleum-based synthetic fibers are not biodegradable, which will cause environmental pollution. In addition, the warp yarn preparation process Sizing is required, and desizing is required during dyeing and finishing. Sizing and desizing will cause problems of environmental pollution and resource consumption. Polylactic a...

Claims

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/02D02G3/40D01D5/34D01F8/14
CPCD01D5/34D01F8/14D02G3/02D02G3/40D10B2331/041
Inventor 刘庆生邓炳耀
Owner JIANGNAN UNIV
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