Spinning and conglutinating method polylactic acid nonwovens preparation method

A non-woven fabric, polylactic acid technology, applied in non-woven fabrics, textiles and papermaking, single-component polyester rayon, etc., can solve the problems of uneven fibers, strength not as good as spunbond method, etc., and achieve easy biodegradation. , excellent mechanical properties, rich source of raw materials

Inactive Publication Date: 2006-02-08
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the melt-blown method can also produce light-weight products, it is generally used in filter materials because of its uneven fibers and inferior strength to the spun-bonded method.

Method used

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  • Spinning and conglutinating method polylactic acid nonwovens preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Polylactic acid with 99 mol% of L-isomer, number average molecular weight of 7,5762, weight average molecular weight of 15,2818, and MFI=32 is used as raw material, and dried at a vacuum of 65 Pa and a temperature of 70°C for 24 hours.

[0020] The dried polylactic acid chips are placed in a screw extruder for melt spinning. The spinning temperature is 195℃, and 48 spinnerets with 106 holes×Φ0.2mm are used to form a spinneret with a total length of 3120mm. Spinning, the spinning pump is a 2.4cc stack pump with a rotation speed of 36 rpm; meanwhile, the obtained polylactic acid nascent fiber is stretched under positive pressure, the pressure of the compressed air is 0.15 MPa, and the stretching speed is 4000 m / min. about.

[0021] The stretched polylactic acid wire is oscillated and moved forward and laid into a net through a wire-separating netting device. When the oscillating amplitude is 25cm, the oscillating frequency is 800 times / min, and the moving speed is 52.6m / min, ...

Embodiment 2

[0024] Using polylactic acid with an L-isomer accounted for 97 mol%, a number average molecular weight of 9,7886, a weight average molecular weight of 235008, and MFI=20 as a raw material, it was dried and balanced at a vacuum of 20 Pa and a temperature of 80°C for 14 hours. In the same device as mentioned above, the spinning temperature is 210°C, the speed of the metering pump is 36 rpm, the pressure of the compressed air is 0.35 MPa, and the drawing speed is about 2354 m / min. When the swing amplitude of the device is 10cm, the swing frequency is 500 times / min, and the moving speed is 26m / min, 60g / m is obtained. 2 The door width is 3 meters of fiber mesh.

[0025] Then the obtained polylactic acid fiber web was pressurized by a hot roll at 155°C with a pressure of 60KG for thermal bonding. Finally, the coil obtained a longitudinal tensile strength of 75N / 5cm, a transverse tensile strength of 53N / 5cm, and an elongation of Polylactic acid spunbond fabric with 40% and 15N / 5cm tear s...

Embodiment 3

[0027] Using polylactic acid with an L-isomer accounted for 97 mol%, a number average molecular weight of 9,7886, a weight average molecular weight of 235008, and MFI=20 as a raw material, it was dried and balanced for 48 hours at a vacuum degree of 50 Pa and a temperature of 60°C. In the same device as mentioned above, the spinning temperature is 210°C, the speed of the metering pump is 40 rpm, the pressure of the compressed air is 0.15 MPa, and the drawing speed is about 1457 m / min. When the swing amplitude of the device is 10cm, the swing frequency is 300 times / min, and the moving speed is 12m / min, 145g / m is obtained. 2 The door width is 3 meters of fiber mesh.

[0028] Then the obtained polylactic acid fiber web was pressurized by a hot roll at 160°C with a pressure of 60KG for thermal bonding. Finally, the coil obtained a longitudinal tensile strength of 150N / 5cm, a transverse tensile strength of 118N / 5cm, and an elongation of Title product with 57% and tear strength of 28.5N...

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Abstract

The present invention relates to spinning and adhering process of preparing non-woven polylactic acid fabric. The present invention prepares non-woven polylactic acid fabric with polylactic acid L-isomer material with high purity, medium molecular weight and high melt index and through low temperature drying, high speed spinning, positive pressure drafting, spreading net, hot rolling to adhere and other technological steps. The present invention has short production process and high production efficiency, and the prepared non-woven polylactic acid fabric has high strength, less elongation, excellent mechanical performance and biodegradability, and may be used in disposable medical articles.

Description

Technical field [0001] The invention belongs to the field of textile materials, and relates to a method for preparing a spunbonded polylactic acid nonwoven fabric. Background technique [0002] Non-woven fabrics are widely used in medical and health fields at home and abroad with unparalleled special properties of traditional woven textiles. At present, the raw materials used in domestic medical and health non-woven fabrics are mainly polypropylene, polyester and polyamide. Since medical nonwovens are mostly disposable products, a large amount of medical wastes made of these non-degradable polymers cause environmental pollution. According to statistics, the consumption of this kind of disposable medical nonwovens in our country reaches 900,000 tons per year, and its impact on the environment can be imagined. In addition, with the ever-decreasing petroleum resources, petroleum-based raw materials such as polypropylene and polyester will face problems such as exhaustion of sources,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/48D01F6/62D04H3/011D04H3/16
Inventor 胡学超邹荣华邵惠丽倪福夏张慧慧
Owner DONGHUA UNIV
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