CN101525812A - Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof - Google Patents
Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof Download PDFInfo
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- CN101525812A CN101525812A CN200810164218A CN200810164218A CN101525812A CN 101525812 A CN101525812 A CN 101525812A CN 200810164218 A CN200810164218 A CN 200810164218A CN 200810164218 A CN200810164218 A CN 200810164218A CN 101525812 A CN101525812 A CN 101525812A
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Abstract
A polylactic acid non-weaving cloth with high strength and low thermal contraction is manufactured by adopting a method taking polylactic acid slices as raw materials, wherein the polylactic acid has the L polylactic acid not less than 95 percent, the L lactic acid monomer not more than 5 percent, the melting point not lower than 160 DEG C and the melt index being 20-60g/10min; the quality of the manufactured non-weaving cloth at a unit area is 15-120g/m<2>, the breaking strength value in one direction (longitudinal direction) is not smaller than 1.5 times of the quality of the non-weaving cloth at the unit area, the breaking strength value in the other vertical direction (horizontal direction) is not smaller than 1.1 times of the quality of the non-weaving cloth at the unit area, the strength ratio in the longitudinal direction and the horizontal direction is smaller than 2, and the dry thermal contraction coefficient is 120 DEG C and is not larger than 5 percent in the 10min state. A high-speed airflow spray head is adopted to stretch to improve the degree of orientation of a continuous yarn so as to obtain enough fibre strength; and rolling mill line pressure higher than 100N/mm and roller temperature of 125-157 DEG C are adopted so as to obtain the optimal bond strength.
Description
Technical field
The present invention relates to spun-bonded non-woven product and production method thereof (or claiming production technology), relate in particular to a kind of polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof.
Background technology
Spun-bonded non-woven and with the compound product of other materials to be widely used in health care goods, packaging material, filtering material and agricultural, industry etc. multi-field.Acquisition possesses the market of meeting serviceability again can cyclic production, and material free from environmental pollution is an inexorable trend.The recyclability of poly-lactic acid material, biodegradable have obtained to generally acknowledge, plastic products and the fibre made with PLA come into the market, the nonwoven product made from polylactic acid short-fiber on non-woven material also begins to come into the market, but the widest spun-bonded non-woven of range of application does not still have the product that satisfies market demands.
In recent years both at home and abroad to having carried out many-sided research and development with PLA processing spun-bonded non-woven, Japan Patent is more.All relate to as JP2005009063, JP2004011037, JP2004162218 and to produce spun-bonded non-woven, but all adopt modification or two or more polymer production, cost height with PLA.Chinese patent has CN101122065, CN1357017, CN1710155A, CN1730763, CN101092067.Wherein CN1357017 is a kind of product of core sheath structure, the product fracture strength of CN730763 only can reach 0.9-1.1 times of square grammes per square metre, the PRODUCTS FIELD of CN101122065 compares up to 7 to brute force, technological process that other patents adopted and technological parameter all can not obtain enough big ultimate strength and enough little dry-hot shrinkage, each than little product, has seriously restricted the actual use of this environment-friendly products to brute force.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high strength, low thermal shrinkage, and polylactic acid non-weaving cloth of fully biodegradable and preparation method thereof is to overcome the defective that existing polylactic acid non-weaving cloth and manufacture method exist.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of polylactic acid non-weaving cloth with high strength and low thermal contraction, with the polylactic acid slice is raw material, described PLA is: L PLA content 〉=95%, L lactic acid monomer content≤5%, fusing point 〉=160 ℃, melt index 20～60g/10min, the mass area ratio of made non-weaving cloth is 15-120g/m
21.5 times of ultimate strength value 〉=its mass area ratio of a direction (vertically), 1.1 times of ultimate strength value 〉=its mass area ratio of another vertical direction (laterally), in length and breadth to brute force than less than 2, dry-hot shrinkage: 120 ℃, under the state of 10min≤5%.
For obtaining above-mentioned polylactic acid non-weaving cloth with high strength and low thermal contraction, the manufacture method that the present invention adopts comprises the steps:
(1), with the pre-crystallization of polylactic acid slice, pre-crystallization temperature is 80-130 ℃;
(2), with the polylactic acid slice intensive drying of pre-crystallization, baking temperature is 80-120 ℃, be 2-8 hour drying time, the moisture 20-50ppm of dry back polylactic acid slice; Except that the moisture 20-50ppm of dropping to that makes PLA, adjust baking temperature and time according to raw materials used performance, the little degree of polymerization polymerisation degree of poly-lactic acid of part is increased, improve the spinnability of polymer and the intensity of fiber;
(3), the polylactic acid slice that drying is good carries out melt extruded in screw extruder, used fusion polylactic acid melt temperature is controlled at 175-235 ℃;
(4), melt Conveying is extruded the formation strand to spinnerets;
(5), strand is evenly cooled off, chilling temperature is 15-25; Preferably adopt the double-sided cooled mode, the cooling condition of each strand is equated;
(6), strand formed on the lace curtaining that long filament is layered on motion uniformly through the drawing-off of extension apparatus high velocity air form fiber web, silk speed is 3500-6000m/min, compressed-air actuated pressure is 0.2-0.5Mpa; Adopt the high velocity air jet stretch, improve the degree of orientation of continuous filament yarn, to obtain enough fibre strengths; The spacing of the outlet of described extension apparatus and lace curtaining be 20-80 centimetre adjustable;
(7), the fiber web that obtains is transported to hot-rolling mill, hot calendering bonding forms finished product, reels at last and takes out, and obtains the PLA spun-bonded non-woven, and the temperature of hot pressing roller is 125-160 ℃, and rolling mill line pressure is greater than 100N/mm.Employing is higher than the rolling mill line pressure of 100N/mm and 125～157 ℃ roller temperature, to obtain best bonding strength.
Employed PLA is the polylactic acid slice of L PLA content 〉=95%, L lactic acid monomer content≤5%, fusing point 〉=160 ℃, melt index 20-60g/10min;
Adopting technique scheme, can obtain the nonwoven product of high strength, low thermal shrinkage, and adapt to the raw material range of broad, can be widely used in health care, agricultural, packing, the multiple field of filtration, is a kind of material of broad-spectrum fully biodegradable.
The invention will be further described below in conjunction with the specific embodiment.
Description of drawings
Fig. 1 is the embodiment of the invention 1 a resultant finished product physical property table;
Fig. 2 is the embodiment of the invention 2 resultant finished product physical property tables.
The specific embodiment
Embodiment 1
With the polylactic acid slice of L PLA content 〉=95%, L lactic acid monomer content≤5%, 160 ℃ of fusing points, melt index 50g/10min as raw material; With 100 ℃ of pre-crystallizations of polylactic acid slice 20 minutes; With the polylactic acid slice intensive drying of pre-crystallization, baking temperature is 95 ℃, and be 6 hours drying time, the moisture≤45ppm of dry back polylactic acid slice; The polylactic acid slice that drying is good is carried out melt extruded in screw extruder, 178 ℃ of melt temperatures; Melt is transported to spinnerets through measuring pump extrudes the formation strand, measuring pump 25r/min; Adopt the bilateral air cooling, strand is evenly cooled off 15 ℃ of chilling temperatures; Strand formed on the lace curtaining that long filament is layered on motion uniformly through the drawing-off of extension apparatus high velocity air form fiber web, silk speed be 3800-4000m/min, and compressed-air actuated pressure is 0.2Mpa, and extension apparatus exports and the spacing of lace curtaining is 30 centimetres, is paved into 100g/m
2Fiber web; The fiber web that obtains is sent into two roller hot-rolling mills, 155 ℃ of milling train top rolls, 148 ℃ of lower rolls, rolling mill line pressure 120N/mm obtains 100g/m
2The PLA spun-bonded non-woven.Its physical property sees Table 1.
Embodiment 2
With the polylactic acid slice of L PLA content 〉=95%, L lactic acid monomer content≤5%, 160 ℃ of fusing points, melt index 30g/10min as raw material; With 100 ℃ of pre-crystallizations of polylactic acid slice 20 minutes; With the polylactic acid slice intensive drying of pre-crystallization, baking temperature is 95 ℃, and be 6 hours drying time, the moisture≤45ppm of dry back polylactic acid slice; The polylactic acid slice that drying is good is carried out melt extruded in screw extruder, 178 ℃ of melt temperatures; Melt is transported to spinnerets through measuring pump extrudes the formation strand, measuring pump 25r/min; Adopt the bilateral air cooling, strand is evenly cooled off 18 ℃ of chilling temperatures; Strand formed on the lace curtaining that long filament is layered on motion uniformly through the drawing-off of extension apparatus high velocity air form fiber web, silk speed be 4200-4500m/min, and compressed-air actuated pressure is 0.4Mpa, and extension apparatus exports and the spacing of lace curtaining is 80 centimetres, is paved into 20g/m
2Fiber web; The fiber web that obtains is sent into two roller hot-rolling mills, 145 ℃ of milling train top rolls, 140 ℃ of lower rolls, rolling mill line pressure 120N/mm obtains 20g/m
2The PLA spun-bonded non-woven.Its physical property sees Table 2.
Claims (5)
1, a kind of polylactic acid non-weaving cloth with high strength and low thermal contraction, it is characterized in that with the polylactic acid slice being raw material, described PLA is: L PLA content 〉=95%, L lactic acid monomer content≤5%, fusing point 〉=160 ℃, melt index 20-60g/10min, the mass area ratio of made non-weaving cloth is 15-120g/m
2, 1.5 times of powerful value 〉=its mass area ratio of longitudinal fracture, 1.1 times of horizontal ultimate strength value 〉=its mass area ratio, compare less than 2 dry-hot shrinkage in length and breadth to brute force: 120 ℃, under the state of 10min≤5%.
2, the manufacture method of the described polylactic acid non-weaving cloth with high strength and low thermal contraction of a kind of claim 1 is characterized in that may further comprise the steps:
(1), with the pre-crystallization of polylactic acid slice, pre-crystallization temperature is 80-130 ℃;
(2), with the polylactic acid slice intensive drying of pre-crystallization, baking temperature is 80-120 ℃, be 2-8 hour drying time, the moisture 20-50ppm of dry back polylactic acid slice;
(3), the polylactic acid slice that drying is good carries out melt extruded in screw extruder, fusion polylactic acid melt temperature is controlled at 175-235 ℃;
(4), melt Conveying is extruded the formation strand to spinnerets;
(5), strand is evenly cooled off, chilling temperature is 15-25 ℃;
(6), strand formed on the lace curtaining that long filament is layered on motion uniformly through the drawing-off of extension apparatus high velocity air form fiber web, silk speed is 3500-6000m/min, compressed-air actuated pressure is 0.2-0.5Mpa;
(7), the fiber web that obtains is transported to hot-rolling mill, hot calendering bonding forms finished product, reels at last and takes out, and obtains the PLA spun-bonded non-woven, and the temperature of hot pressing roller is 125-160 ℃, and rolling mill line pressure is greater than 100N/mm.
3, the manufacture method of polylactic acid non-weaving cloth with high strength and low thermal contraction according to claim 2, the spacing that it is characterized in that the outlet of described extension apparatus and lace curtaining be 20-80 centimetre adjustable.
4, the manufacture method of polylactic acid non-weaving cloth with high strength and low thermal contraction according to claim 2 is characterized in that adopting the double-sided cooled mode.
5, the manufacture method of polylactic acid non-weaving cloth with high strength and low thermal contraction according to claim 3 is characterized in that adopting the double-sided cooled mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810164218A CN101525812A (en) | 2008-12-31 | 2008-12-31 | Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof |
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| CN200810164218A CN101525812A (en) | 2008-12-31 | 2008-12-31 | Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102791916A (en) * | 2010-03-25 | 2012-11-21 | 尤妮佳股份有限公司 | Process for production of polylactic acid-based air-through nonwoven fabric, and polylactic acid-based air-through nonwoven fabric |
| CN102926024A (en) * | 2012-10-23 | 2013-02-13 | 许昌鸿洋生化实业发展有限公司 | Degradable polylactic acid fiber for wig and production process for polylactic acid fiber |
| CN102936796A (en) * | 2012-11-19 | 2013-02-20 | 大连恒大高新材料开发有限公司 | Production process of PLA (poly lactic acid fiber) geotextile |
| CN104878458A (en) * | 2015-05-27 | 2015-09-02 | 中国水产科学研究院东海水产研究所 | Fishing polylactic acid monofilament manufacturing method |
| CN107407028A (en) * | 2016-03-16 | 2017-11-28 | 株式会社东芝 | Fiber-wall-element model piece and its manufacture method |
| CN109705548A (en) * | 2018-12-24 | 2019-05-03 | 武汉市工程科学技术研究院 | A kind of method and its composite material reducing polylactic acid melting temperature using lactic acid monomer |
-
2008
- 2008-12-31 CN CN200810164218A patent/CN101525812A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102791916A (en) * | 2010-03-25 | 2012-11-21 | 尤妮佳股份有限公司 | Process for production of polylactic acid-based air-through nonwoven fabric, and polylactic acid-based air-through nonwoven fabric |
| CN102926024A (en) * | 2012-10-23 | 2013-02-13 | 许昌鸿洋生化实业发展有限公司 | Degradable polylactic acid fiber for wig and production process for polylactic acid fiber |
| CN102936796A (en) * | 2012-11-19 | 2013-02-20 | 大连恒大高新材料开发有限公司 | Production process of PLA (poly lactic acid fiber) geotextile |
| CN104878458A (en) * | 2015-05-27 | 2015-09-02 | 中国水产科学研究院东海水产研究所 | Fishing polylactic acid monofilament manufacturing method |
| CN107407028A (en) * | 2016-03-16 | 2017-11-28 | 株式会社东芝 | Fiber-wall-element model piece and its manufacture method |
| CN107407028B (en) * | 2016-03-16 | 2020-10-02 | 株式会社东芝 | Fiber-oriented sheet and method for producing same |
| CN109705548A (en) * | 2018-12-24 | 2019-05-03 | 武汉市工程科学技术研究院 | A kind of method and its composite material reducing polylactic acid melting temperature using lactic acid monomer |
| CN109705548B (en) * | 2018-12-24 | 2021-07-27 | 武汉市工程科学技术研究院 | Method for reducing melting temperature of polylactic acid by using lactic acid monomer and composite material thereof |
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