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Low-melting-point sheath-core-type polylactic acid composite fiber and preparation method thereof

A technology of composite fiber and polylactic acid, which is applied in fiber processing, conjugated synthetic polymer artificial filament, filament/thread forming, etc., can solve the problems of toxic solvent recovery, complex process and difficulty, etc., and achieve good bulkiness, High elastic recovery rate, effect of increasing added value and market competitiveness

Inactive Publication Date: 2015-12-09
北京普利玛科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solution spinning process is more complicated, and the solvent is generally toxic and difficult to recycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Using a -40°C dew point dryer, dry spinning-grade polylactic acid chips with a model number of 6201D, a melt index of 22g / 10min, a melting point of 170°C, and a relative viscosity of 3.1 at 90°C for 2 hours, and then cool down to Keep at 55°C for 6 hours, and control the moisture at 50ppm;

[0033] Using a -40°C dew point dryer, dry polylactic acid slices with a model number of 6064D, a melt index of 18g / 10min, a melting point of 130°C, and a relative viscosity of 3.2 at 55°C for 8 hours to control the moisture content at 50ppm.

[0034] (2) Inject the dried 6201D and 6064D slices into different screw extruders respectively, and control the head temperature to 200°C and 170°C respectively to melt the slices to obtain two kinds of molten melts, which are respectively filtered through the melts The device enters the spinning metering pump, and quantitatively enters the composite spinning assembly. The weight ratio of 6201D melt and 6064D melt injected by the metering...

Embodiment 2

[0038] Step (1) is with embodiment 1.

[0039] (2) Inject the dried 6201D and 6064D slices into different screw extruders respectively, and control the head temperature to 200°C and 170°C respectively to melt the slices to obtain two kinds of molten melts, which are respectively filtered through the melts The device enters the spinning metering pump, quantitatively enters the composite spinning assembly, and the temperature of the spinning box is controlled at 230°C. The weight ratio of 6201D melt and 6064D melt injected by the metering pump is 75:25. The two melts flow separately in the isolated cavity of the composite spinning assembly, and are mixed to form polylactic acid with a skin-core structure when they exit the spinneret. Precursor tow, the number of holes in the spinneret is 36, and the diameter of the spinneret is 120 mm. After the melt is extruded through the spinneret, it is drawn and wound on the winding machine, and the temperature of the cooling area under th...

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Abstract

The invention relates to a low-melting-point sheath-core-type polylactic acid composite fiber and a preparation method thereof and belongs to the field of double-component composite fibers. In the composite fiber, low-melting point polylactic acid is employed as a sheath layer and spinning-grade polylactic acid is employed as a core layer, wherein the core layer is completely wrapped by the sheath layer. The weight of the sheath layer accounts for 25-40% of the total weight of the composite fiber. The invention also provides the preparation method of the composite fiber, which comprises the steps of performing drying cut sheets, double-component melt distribution spinning, and fiber cooling, solidifying and winding to prepare raw filaments of the sheath-core-type polylactic acid composite fiber, and then performing after treatment to produce the sheath-core-type polylactic acid composite fiber. By means of the characters that the sheath-core-type polylactic acid composite fiber is good in loosen property and is high in elasticity recovery rate, the composite fiber can be subjected to thermal binding to form non-woven cloth, which can be widely applied as disposable sanitary materials and indoor decorative materials, thereby greatly improving additional value and market competitiveness of polylactic acid fibers.

Description

technical field [0001] The invention relates to a low melting point sheath-core polylactic acid composite fiber and a preparation method thereof, belonging to the field of two-component composite fibers. Background technique [0002] Polylactic acid is a biodegradable polymer with good mechanical and physical properties, and is suitable for various processing methods such as extrusion, injection molding, film drawing, and spinning. It can be widely used in medical treatment, sanitation, pharmacy, agriculture, packaging industry, textile and garment industry, automobile decoration and other fields, and can replace traditional polymer materials in large quantities. Its products range from industrial to civilian use involving plastic products, packaged food, non-woven fabrics, industrial and civil textile fabrics, agricultural fabrics, health care fabrics, rags, disposable high-end sanitary products, outdoor anti-ultraviolet fabrics, tent fabrics, floor mats, etc. Because of i...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01D13/00D01D5/34
Inventor 史佳林
Owner 北京普利玛科技有限责任公司
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