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Skin-core structure poly(3-hydroxybutyrate-co-3-hydroxyvalerate)fiber, nonwoven material and preparation methods of skin-core structure poly(3-hydroxybutyrate-co-3-hydroxyvalerate)fibers and nonwoven material

A technology of hydroxyvalerate and non-woven materials, which is applied in non-woven fabrics, fiber treatment, textiles and papermaking, etc. It can solve the problems of PHBV fiber orientation and crystal structure damage, no practical application value, poor mechanical properties, etc., and achieve Combined with high fastness, soft hand feeling and good mechanical properties

Active Publication Date: 2017-03-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polypropylene fiber is the main raw material of non-woven materials, and its fiber web can be bonded in different ways, and thermal bonding is one of the main bonding methods. However, for PHBV fiber web, if thermal bonding , its performance will be seriously damaged, the main reason is: whether it is hot air bonding or hot rolling bonding, the orientation and crystal structure of PHBV fibers will be destroyed, and the melting part will be damaged during cooling or storage. Spherulites will be formed, and large-sized spherulites are the reason for the brittle performance of PHBV, so that the mechanical properties of the final PHBV nonwoven material are poor and have no practical application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Firstly, PHBV with a HV content of 8.0 mol% and a PHBV with a HV content of 20 mol% were dried in a vacuum oven at 80° C. for 24 hours for use.

[0022] (2) Add the dried PHBV 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 to obtain PHBV short fibers with skin-core structure. The extrusion temperature is 160°C, the spinning speed is 800m / min, the first stretching temperature is 45°C, the first stretching ratio is 5 times, the second stretching temperature is 60°C, and the second stretching ratio is 2 times. The setting temperature is 90°C, and the composite ratio of the skin layer and the core layer is 35:65. The breaking strength of the obtained PHBV sheath-core structural fiber is 3.8cN / dtex, and th...

Embodiment 2

[0025] (1) Firstly, PHBV with a HV content of 2.5 mol% and a PHBV with a HV content of 20 mol% were dried in a vacuum oven at 80° C. for 24 hours for use.

[0026] (2) Add the dried PHBV 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 to obtain PHBV short fibers with skin-core structure. The extrusion temperature is 175°C, the spinning speed is 1000m / min, the first stretching temperature is 50°C, the stretching ratio is 4 times, the second stretching temperature is 65°C, and the second stretching ratio is 2 times. The setting temperature is 90°C, and the composite ratio of the skin layer and the core layer is 50:50. The breaking strength of the obtained PHBV sheath-core structural fiber is 2.5cN / dtex, and the bre...

Embodiment 3

[0029] (1) First, dry PHB and PHBV with a HV content of 20 mol% in a vacuum oven at 80° C. for 24 hours before use.

[0030] (2) Add the dried PHBV 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 to obtain PHBV short fibers with skin-core structure. The extrusion temperature is 180°C, the spinning speed is 1000m / min, the first stretching temperature is 45°C, the first stretching ratio is 3.5 times, the second stretching temperature is 65°C, and the second stretching ratio is 2 times. The setting temperature is 90°C, and the composite ratio of the skin layer and the core layer is 40:60. The breaking strength of the obtained PHBV skin-core structural fiber is 1.9 cN / dtex, and the breaking elongation is 40%.

[003...

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Abstract

The invention discloses a skin-core structure poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) fiber, a nonwoven material and preparation methods of the skin-core structure poly(3-hydroxybutyrate-co-3-hydroxyvalerate)fiber and the nonwoven material, wherein the core layer of the fiber is PHBV having a 3-hydroxyvalerate (HV) content of 0-20 mol%, the skin layer is PHBV having a HV content of 20-100 mol%, and the melting point of the skin layer is lower than the melting point of the core layer. The skin-core structure PHBV fiber preparation method comprises: drying raw materials, respectively adding to the corresponding material hoppers of a compound spinning machine, carrying out melt transporting, spinning, cooling through cold air blowing, carrying out winding feeding, carrying out oil bath stretching, carrying out steam bath stretching, carrying out tension heat shaping, oiling, carrying out silk stacking, coiling, loosening, and cutting to prepare the skin-core structure PHBV short fiber. The corresponding nonwoven material preparation method comprises: (1) carrying out combing net forming by using the skin-core structure PHBV short fiber as a raw material to prepare a skin-core structure PHBV fiber net; and (2) carrying out thermal adhesion on the skin-core structure PHBV fiber net to obtain the PHBV nonwoven material, wherein the thermal adhesion temperature is between the melting points of the skin layer and the core layer, and the obtained PHBV nonwoven material is mainly used for medical health, and other fields.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with a skin-core structure and a preparation method thereof. Background technique [0002] Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a kind of non-petroleum-based thermoplastic polyester material synthesized by microbial fermentation. Its resources are renewable, biodegradable, melt-processable, The performance is similar to that of polypropylene, which can replace polypropylene as the raw material of fibers. Polypropylene fiber is the main raw material of non-woven materials, and its fiber web can be bonded in different ways, and thermal bonding is one of the main bonding methods. However, for PHBV fiber web, if thermal bonding , its performance will be seriously damaged, the main reason is: whether it is hot air bonding or hot rolling bonding, the orientation and crystal structure of PHBV fibers will be destroyed...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01D5/12D01D5/34D01D10/02D04H1/4382D04H1/541
CPCD01D5/12D01D5/34D01D10/02D01F8/14D04H1/4382D04H1/541
Inventor 刘庆生邓炳耀
Owner JIANGNAN UNIV
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