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Polylactic acid nonwoven cloth and preparation method and application thereof

A polylactic acid and non-woven technology, applied in the directions of melt spinning, stretch spinning, single-component polyester rayon, etc., can solve the problems of narrow processing temperature window, poor processing thermal stability, and low crystallization rate. , to achieve the effect of reducing polarity, high impact resistance and easy crystallization

Inactive Publication Date: 2018-06-08
北京泰洋泉生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, polylactic acid is a semi-crystalline high polymer with low crystallization rate, high hardness, poor processing thermal stability, and narrow processing temperature window. becoming a research hotspot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add montmorillonite (with an average particle size of 2 μm) to the ethanol solution of polyphosphoric acid, continue to stir for 60 minutes, preferably 20 minutes to 100 minutes, and filter; wherein, the concentration of the ethanol solution of polyphosphoric acid is 10 wt %; The degree of polymerization of phosphoric acid is 100;

[0028] (2) Add the ethanol solution of dopamine to the filter cake that step (1) obtains, stir 50min again after adding, filter, dry, obtain modified montmorillonite; Wherein, the mass concentration of the ethanol solution of dopamine is 8%; The weight ratio of soil removal, polyphosphoric acid and dopamine is 40:30:20.

[0029] (3) uniformly mixing the modified montmorillonite and polylactic acid to obtain a mixture; the montmorillonite accounts for 3 wt% of the weight of the polylactic acid.

[0030] (4) Put the mixture into a twin-screw extruder, and the twin-screw extruder melts and blends the materials at a temperature range of 190...

Embodiment 2

[0033] (1) Montmorillonite (an average particle diameter of 7 μm) is added to the ethanol solution of polyphosphoric acid, continuously stirred for 90min, and filtered; wherein, the concentration of the ethanol solution of polyphosphoric acid is 12wt%; the degree of polymerization of polyphosphoric acid is 80;

[0034] (2) Add the ethanol solution of dopamine to the filter cake that step (1) obtains, stir 80min again after adding, filter, dry, obtain modified montmorillonite; Wherein, the mass concentration of the ethanol solution of dopamine is 10%; The weight ratio of soil removal, polyphosphoric acid and dopamine is 45:35:18.

[0035] (3) Mix the modified montmorillonite and polylactic acid uniformly to obtain a mixture; wherein the montmorillonite accounts for 4 wt% of the weight of the polylactic acid.

[0036] (4) The mixture is put into a twin-screw extruder, and the twin-screw extruder melts and blends the materials at a temperature range of 175° C. at 30 rpm, and the...

Embodiment 3

[0039] (1) Montmorillonite (an average particle size of 8 μm) is added to the ethanol solution of polyphosphoric acid, continuously stirred for 70min, and filtered; wherein, the concentration of the ethanol solution of polyphosphoric acid is 8wt%; the degree of polymerization of polyphosphoric acid is 40;

[0040] (2) Add the ethanol solution of dopamine to the filter cake that step (1) obtains, stir 40min again after adding, filter, dry, obtain modified montmorillonite; Wherein, the mass concentration of the ethanol solution of dopamine is 15%; The weight ratio of soil removal, polyphosphoric acid and dopamine is 42:35:15.

[0041] (3) Mix the modified montmorillonite and polylactic acid evenly to obtain a mixture; wherein, the montmorillonite accounts for 5 wt% of the weight of the polylactic acid.

[0042] (4) The mixture is put into a twin-screw extruder, and the twin-screw extruder melts and blends the materials at a temperature range of 185° C. at 40 rpm, and then extru...

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Abstract

The invention relates to polylactic acid nonwoven cloth and a preparation method and application thereof. The preparation method comprises the following steps; (1) adding montmorillonoid into an ethylalcohol solution of polyphosphoric acid, stirring, and filtering; (2) adding filter cake obtained in step (1) into an ethyl alcohol solution of dopamine, stirring after adding is completed, filtering, and drying, so as to obtain the modified montmorillonoid; (3) uniformly mixing the modified montmorillonoid and polylactic acid, so as to obtain a mixture; (4) feeding the mixture into a screw extruder, extruding, and granulating, so as to obtain a complex; (5) treating the complex by a melting and spraying method so as to obtain nascent fibers, drawing and extending the nascent fibers by air flow to form net-shaped fibers with uniformly paved long yarns, and adhering the net-shaped fibers by a heat roll, so as to obtain the polylactic acid nonwoven cloth. The preparation method has the advantages that the montmorillonoid is easily compatible with the polylactic acid, and the polylactic acid can be easily crystallized. The polylactic acid nonwoven cloth has the advantages that the toughness and anti-impact property are higher, the heat stability in processing is good, and the like.

Description

technical field [0001] The invention relates to a preparation method and application of polylactic acid nonwoven fabric. Background technique [0002] Non-woven non-woven fabrics are fiber mesh fabrics that do not require warp and weft weaving and interweaving, but only require artificial or natural filaments or short fibers to be randomly strutted, laid, and reinforced. Due to its product characteristics, the preparation of nonwovens has the advantages of simple process, high production efficiency, low cost, wide range of uses, and diverse sources, so that it is widely used in clothing linings, medical dressings, industrial filter linings, and thermal insulation packaging. and many other fields. [0003] However, due to the low cost and wide application of non-woven fabrics, it is difficult to recycle and the return is too low. Therefore, people usually use disposable methods for non-woven products, and this disposable method For the increasing number of chemical fiber no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/011D04H3/16D01D5/08D01D5/14D01F1/10D01F6/92
CPCD04H3/011D01D5/08D01D5/14D01F1/10D01F6/92D04H3/16
Inventor 吴京川朱宇刘永忠
Owner 北京泰洋泉生物科技有限公司
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