One-step polylactic acid spun-laid spunlace non-woven fabric and manufacturing method of non-woven fabric

A technology of non-woven fabrics and spun webs, which is applied in the field of non-woven fabrics to achieve the effects of short process flow, good moisture absorption and breathability, and increased strength

Inactive Publication Date: 2012-07-18
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the strict requirements of the slice drying process and the lack of product performance in the existing polylactic acid slice spinning method, the technical problem to be solved by the present invention is to provide a one-step method for preparing polylactic acid spinning and forming spunlaced nonwovens and its production. The method is that the polylactic acid spunlace nonwoven fabric is fermented and polymerized by cornstarch to make a polylactic acid melt, and the polylactic acid spunlace nonwoven fabric is prepared by one-step method of spinning into a web and spunlace reinforcement directly. , eliminating the need for polymer melt granulation, chip drying and other processes, the process is short, low cost, suitable for industrial production; the product has high strength, and has good softness, skin affinity, moisture absorption and breathability and biodegradation It can be used in surgical gowns, surgical covering cloths, masks, baby diapers, women's sanitary napkins, adult urinary incontinence products, isolation clothing, disposable masks, gloves and other medical and sanitary products. The development and utilization prospects are broad and have practical application value

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • One-step polylactic acid spun-laid spunlace non-woven fabric and manufacturing method of non-woven fabric
  • One-step polylactic acid spun-laid spunlace non-woven fabric and manufacturing method of non-woven fabric

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Experimental program
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Effect test

Embodiment 1

[0031] Corn starch is hydrolyzed to make glucose, and then anaerobically fermented with Lactobacillus. During the fermentation process, lactic acid is neutralized with liquid caustic soda. After the fermentation liquid is purified, it is produced by electrodialysis process to produce L-lactic acid with a purity of 99.5%. The resulting L-lactic acid is dehydrated under reduced pressure to prepare lactic acid oligomers. When the reaction temperature is 150°C, the amount of stannous octoate catalyst is 0.3%, and the screw speed is 60r / min, the viscosity-average molecular weight is 158,000 through twin-screw reaction. Polylactic acid melt; the melt is filtered through a filter, metered by a metering pump, and then spun at 225°C. After cooling, it is drawn and laid in an airflow of 5000m / min. After spunlace, the above-mentioned nonwoven fabric was obtained by drying at 115°C.

[0032] The basis weight of the nonwoven product is 80g / m 2 , The average fineness of the fibers in the f...

Embodiment 2

[0034] Corn starch is hydrolyzed to make glucose, and then anaerobically fermented with Lactobacillus. During the fermentation process, lactic acid is neutralized with liquid caustic soda. After the fermentation liquid is purified, it is produced by electrodialysis process to produce L-lactic acid with a purity of 99.5%. The resulting L-lactic acid is dehydrated under reduced pressure to prepare lactic acid oligomers. When the reaction temperature is 150°C, the amount of stannous octoate catalyst is 0.4%, and the screw speed is 75r / min, the viscosity-average molecular weight is 182,000 through twin-screw reaction. Polylactic acid melt; the melt is filtered through a filter, metered by a metering pump, and then spun at 230°C. After cooling, it is drawn and laid in an airflow of 5500m / min. After spunlace, the above-mentioned nonwoven fabric was obtained by drying at 115°C.

[0035] The basis weight of the nonwoven product is 80g / m 2 , The average fineness of the fibers in the f...

Embodiment 3

[0037] Corn starch is hydrolyzed to make glucose, and then anaerobically fermented with Lactobacillus. During the fermentation process, lactic acid is neutralized with liquid caustic soda. After the fermentation liquid is purified, it is produced by electrodialysis process to produce L-lactic acid with a purity of 99.5%. The resulting L-lactic acid is dehydrated under reduced pressure to prepare lactic acid oligomers. When the reaction temperature is 150°C, the amount of stannous octoate catalyst is 0.5%, and the screw speed is 75r / min, the viscosity-average molecular weight is 198,000 through twin-screw reaction. Polylactic acid melt; the melt is filtered through a filter, metered by a metering pump, and then spun at 230°C. After cooling, it is drawn and laid in an airflow of 6000m / min. After spunlace, the above-mentioned nonwoven fabric was obtained by drying at 115°C.

[0038] The basis weight of the nonwoven product is 80g / m 2 , The average fineness of the fibers in the f...

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Abstract

The invention relates to a one-step polylactic acid spun-laid spunlace non-woven fabric and a manufacturing method of the non-woven fabric. The non-woven fabric is prepared from polylactic acid filaments, and the fiber number is in a range of 1-4dtex; the component of the non-woven fabric is crystalline polylactic acid, which has a molecular weight of above 150,000, a melting point of 160-180 DEG C and a glass transition temperature of about 60 DEG C, and is prepared by polymerizing maize starch. The manufacturing method of the non-woven fabric comprises the following steps of: 1, preparing a polylactic acid spun melt, namely, fermenting the maize starch to prepare the polylactic acid, preparing a polylactic acid prepolymer by controlling polymerization conditions with polylactic acid, and preparing the polylactic acid spun melt with a molecular weight of above 150,000 through continuous melt polycondensation by utilizing a double screw; and 2, preparing a polylactic acid spun-bonded spunlace non-woven fabric, namely, spinning the spun melt by a spinning assembly, cooling and drafting by air current, separating and laying, fixing nets by utilizing the spunlace technology, and drying to obtain the polylactic acid spun-laid spunlace non-woven fabric. The polylactic acid spun-laid spunlace non-woven fabric is high in intensity and has the characteristics of good softness, skin affinity, moisture permeability and biodegradability.

Description

technical field [0001] The invention relates to a non-woven fabric manufacturing technology, specifically a polylactic acid spun-laid spunlaced non-woven fabric with high strength, good softness, skin affinity, moisture absorption and breathability and biodegradability and its For the manufacturing method, the International Patent Classification No. is proposed to be Int.Cl D01F1 / 09 (2006.01). Background technique [0002] Polylactic acid (PLA) uses starch in some plants such as corn, wheat, and cassava as the initial raw material. It is decomposed by enzymes to obtain glucose, and then fermented by lactic acid bacteria to become lactic acid, and then chemically synthesized to obtain high-purity polylactic acid. The non-woven fabric made of polylactic acid made of this renewable resource is a new type of material that does not depend on natural petrochemical resources at all, so its development is not restricted by the crisis of the world's oil and coal depletion. At the sa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/009D04H3/11D04H3/03D01D1/04
Inventor 程博闻刘亚丁长坤康卫民镇垒
Owner TIANJIN POLYTECHNIC UNIV
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