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Modified polylactic acid nonwoven fabric and its preparation method and application

A technology of non-woven fabrics and polylactic acid, which is applied in the direction of non-woven fabrics, separation methods, textiles, and papermaking. It can solve problems such as complex processes and increase the difficulty of material development and preparation, achieve broad application prospects, and improve electret performance. Poor, increased charge trapping effect

Active Publication Date: 2022-02-22
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above scheme uses nanocellulose or modified nanocellulose to modify polylactic acid, and the process is more complicated, which increases the difficulty of material development and preparation.

Method used

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  • Modified polylactic acid nonwoven fabric and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] A kind of preparation method of modified polylactic acid nonwoven fabric, comprises the steps:

[0058] Mixing the modified nanocellulose and lactic acid in water to obtain a mixed dispersion liquid, the modified nanocellulose has a sulfonic acid group and a hydroxyl group;

[0059] Heat and stir the mixed dispersion until the solid content of the mixed dispersion is 80%~95%, and then carry out in-situ catalytic melt condensation at 140°C~180°C and a pressure of 2kPa~6kPa for 1h~12h Polymerization, during which the precipitated moisture is removed from the reaction system to obtain a nanocellulose polylactic acid prepolymer composite material;

[0060] Pulverizing the nanocellulose polylactic acid prepolymer composite material to obtain powder;

[0061] The powder is kept at 70°C-120°C for 0.1h-5h, and then solid-state condensation polymerization is carried out at 120°C-160°C and the pressure is less than or equal to 2kPa for 0.1h-20h to prepare poly Polylactic acid m...

specific Embodiment

[0116] In the following examples and comparative examples:

[0117] (1) The test method of melt index is: GB / T3682-2000;

[0118] (2) The test method for the areal density of modified polylactic acid nonwovens is: GB / T 24218.1;

[0119] (3) The test methods for breaking strength and elongation at break of modified polylactic acid nonwovens are: GB / T 24218.3;

[0120] (4) The test methods for filtration efficiency and resistance of modified polylactic acid nonwovens are: GB / T 24218.15, GB / T14295, GB / T 32610.

[0121] (5) The molecular weight of the polylactic acid on the polylactic acid material having a multi-armed star structure in the following examples and comparative examples is 1,000-100,000 Daltons.

Embodiment 1

[0123] After the bacterial cellulose was hydrolyzed with sulfuric acid, it was centrifuged and concentrated and washed with water to make a modified nanocellulose aqueous dispersion with a content of 3wt%. After ultrasonic dispersion, 85wt% lactic acid aqueous solution was added, stirred evenly, and transferred to a vacuum reaction Still stirring, wherein the mass ratio of modified nanocellulose to lactic acid is 2:100;

[0124] Heating to 60°C, steaming out water until the solid content is 80wt%, heating to 140°C, keeping the pressure at 2kPa, reacting for 1 hour, taking it out and lowering it to room temperature to obtain a nanocellulose polylactic acid prepolymer composite material;

[0125]Use a pulverizer to pulverize the above-mentioned nanocellulose polylactic acid prepolymer composite material, screen out the powder with a particle size of less than 150 μm through a 100-mesh sieve, place it in a vacuum oven and heat it to 120°C, keep it for 5 hours, and then keep the pr...

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Abstract

The invention relates to a modified polylactic acid nonwoven fabric, a preparation method and application thereof. The preparation method of the modified polylactic acid nonwoven fabric comprises: first preparing polylactic acid material with a multi-arm star structure, and then using the polylactic acid material with a multi-arm star structure as a polylactic acid modifier, and polylactic acid The polylactic acid composite material is prepared by mixing materials; the polylactic acid composite material is subjected to solution spinning treatment or melt spinning treatment to prepare modified polylactic acid fibers, and the steps of performing nonwoven fabric forming treatment on the modified polylactic acid fibers . The polylactic acid material with multi-arm star structure prepared by this method is used as a modifier of polylactic acid, because it has a large free volume and can form physical crosslinks with polylactic acid, it can play plasticizing and The toughening effect improves the melt strength and melt fluidity of polylactic acid, improves the spinning process, increases the bonding between fibers, and improves spinning efficiency and the quality of nonwovens.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a modified polylactic acid nonwoven fabric and its preparation method and application. Background technique [0002] Biodegradable polymers are a major development trend in the application field of polymer materials. Polylactic acid, as a semi-crystalline polymer polymerized from lactic acid obtained from bio-based raw materials, can be completely degraded through various pathways. After decades of development, it has become the most widely used biodegradable polymer. Among them, fibers made of polylactic acid can be used as clothing fabrics, household materials, medical materials, non-woven materials, biodegradable packaging materials, etc. has been widely used. However, polylactic acid has the characteristics of high melting point, poor crystallinity, high brittleness, and low polarity. During processing and use, it exhibits low melt fluidity, slow crysta...

Claims

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Application Information

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IPC IPC(8): D04H1/435D01F8/14B01D39/08B01D46/00B01D46/54D01D5/06D01D5/08D01D5/00
CPCD04H1/435D01F8/14B01D39/083B01D46/0001B01D46/546D01D5/06D01D5/08D01D5/0023
Inventor 田俊鹏和玉光郝思嘉许婧杨程
Owner 北京石墨烯技术研究院有限公司
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