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Fully-degradable polylactic acid fiber melt-blowing nonwoven fabric and preparation method thereof

A melt-blown non-woven fabric and polylactic acid fiber technology, which is applied in the field of fully degradable poly-lactic acid fiber melt-blown non-woven fabric products and its preparation technology, can solve the problem of high vertical and horizontal strength, uneven fibers, melt-blown non-woven fabrics Low strength and other problems, to achieve the effect of stable quality, uniform surface and good process stability

Inactive Publication Date: 2012-07-25
豆丁乐园(南京)婴儿用品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the disadvantages of low strength of melt-blown nonwovens and relatively large longitudinal and transverse strengths, further improve its filtration efficiency, reduce the extrusion temperature at the PLA melt-blown die, reduce fiber unevenness, broken wires and entanglement rates, and To achieve the purpose of industrial production, the invention provides a fully degradable polylactic acid fiber melt-blown nonwoven fabric

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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  • Fully-degradable polylactic acid fiber melt-blowing nonwoven fabric and preparation method thereof
  • Fully-degradable polylactic acid fiber melt-blowing nonwoven fabric and preparation method thereof
  • Fully-degradable polylactic acid fiber melt-blowing nonwoven fabric and preparation method thereof

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preparation example Construction

[0041] The specific implementation process of the present invention will be further described below in conjunction with examples. The preparation method of the invention adopts novel fully degradable PLA slices as raw materials, and prepares non-woven fabrics by a melt blown process. The PLA melt-blown nonwoven fabric process prepared by the present invention mainly includes the following four steps: (1) PLA chip selection and drying. (2) Melt extrusion process. (3) Spinning and stretching process. (4) Web forming process. (5) Hot rolling reinforcement process. According to the prior art, the technical problems to be solved are mainly the selection and drying of PLA chips, melt spinning process, web forming process and hot rolling process parameters.

[0042] Considering the rheology and melt viscosity of the PLA melt after melting the slices, the melt blown process has the following requirements for the PLA slices: the molecular weight of the slices should be concentrated...

Embodiment 1

[0059] (1) PLA slices were dried. The PLA slices are put into continuous drying equipment for full drying. The molecular weight of the slices is 100,000, the melt index is 80-85, and the thermal cracking temperature is 305°C. The drying temperature is 100°C, the drying time is 5 hours, and the water content of the PLA chips is 22ppm after drying.

[0060] (2) PLA chip melt extrusion process. The screw pitch is 3mm, the length-to-diameter ratio (L / D) is 30, the screw speed is 25rpm, the internal temperature of the screw extruder is 208°C, the box temperature is 190°C, the feed section is 150°C, and the compression section is 180°C. °C, the metering section is at 215 °C. The temperature of the melt-blown die head is 195°C, the hole diameter is 0.2mm, and the melt extrusion rate is 0.344g / (hole·min).

[0061] (3) PLA filament stretching process. The hot air temperature is 205°C, the hot air velocity is 600m / s, the pressure is 0.3Mpa, the hot air injection angle is 60°, the co...

Embodiment 2

[0069] (1) PLA slices were dried. The PLA slices are put into continuous drying equipment for full drying. The molecular weight of the slices is 100,000, the melt index is 80-85, and the thermal cracking temperature is 340°C. The drying temperature is 80°C, the drying time is 8 hours, and the moisture content of the PLA chips is 18ppm after drying.

[0070] (2) PLA chip melt extrusion process. The screw pitch is 3mm, the length-to-diameter ratio (L / D) is 35, the screw speed is 45rpm, the internal temperature of the screw extruder is 198°C, the box temperature is 190°C, the feed section is 155°C, and the compression section is 185°C. °C, the metering section is at 210 °C. The temperature of the melt-blown die head is 185°C, the hole diameter is 0.2mm, and the melt extrusion rate is 0.144g / (hole·min).

[0071] (3) PLA filament stretching process. The hot air temperature is 195°C, the hot air velocity is 800m / s, the pressure is 0.28Mpa, the hot air injection angle is 60°, the...

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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Abstract

The invention discloses fully-degradable polylactic acid fiber melt-blowing nonwoven and a preparation method thereof. The nonwoven is characterized in that polylactic acid slices are spinned at a melting temperature; and fiber filaments stretched by hot air is formed by self-adhesion and hot rolling, wherein, the even fineness of the nonwoven fiber filaments is 0.52-5mu m, the surface density is5-50g / m2, the thickness is 0.1-0.9mm, the ratio of longitudinal strength to transverse strength is 0.9-1.2, and the filtering efficiency to bacteria is above 95%. The filtering efficiency of the melt-blowing nonwoven product of the invention to bacteria reaches up to 95% which is far higher than that of the existing similar products. The invention solves the problem of low and uneven longitudinalstrength and transverse strength of the existing melt-blowing nonwoven. The invention lowers the melt-blowing die head temperature to 180-185 DEG C and brings optimal spinning effect. The technology of the invention is easy to operate and control, has favorable technical stability and can carry out industrial production.

Description

technical field [0001] The invention belongs to the field of nonwoven fabrics of textile materials, and in particular relates to a fully degradable polylactic acid fiber melt-blown nonwoven fabric product and a preparation process thereof. Background technique [0002] Due to the double pressure from the increasing awareness of environmental protection and the depletion of non-renewable resources such as petroleum, the development and application of biodegradable materials has become one of the focuses of people's attention. Polylactic acid (PLA) is made from renewable resources such as corn, wheat and potatoes. Its products are environmentally friendly and can be completely degraded into CO after use. 2 and H 2 O, also has the ability of composting, so polylactic acid is an ideal degradable raw material. [0003] For the research, development and application of polylactic acid, the United States, Japan and some developed countries in Europe are at the forefront of other c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H3/16D01D5/098D01F6/62
Inventor 柳铭
Owner 豆丁乐园(南京)婴儿用品有限公司
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