CN101157273A - A method for forming concba lamellar structure with degradable plastics PLA - Google Patents
A method for forming concba lamellar structure with degradable plastics PLA Download PDFInfo
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- CN101157273A CN101157273A CNA2007100480583A CN200710048058A CN101157273A CN 101157273 A CN101157273 A CN 101157273A CN A2007100480583 A CNA2007100480583 A CN A2007100480583A CN 200710048058 A CN200710048058 A CN 200710048058A CN 101157273 A CN101157273 A CN 101157273A
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- degradable plastics
- batten
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- lamellar structure
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Abstract
The invention discloses a method, by which the biodegradable plastic PLA can form a shell-like samdwich structure; the method includes the following steps: firstly, under the temperature of 150-200 DGE C and the injection pressure of 60 bar -160 bar, the sample of the biodegradable plastic PLA can be molded; secondly, the molded sample of the biodegradable plastic PLA can be cut into a rectangular block of 35 mm * 10mm * 4mm; thirdly, the prepared sample of the biodegradable plastic PLA is put in the cavity of a module, under the temperature of 0-170 DGE C, the pressure of 0-1000 MPa, and the time of 0-150 min, the polymer begins to flow induced by low temperature and pressure to form the PLA with the micro shell-like samdwich structure. The method improves the appearance performance of the products and the mechanical properties of the material, such as the ability of impacting, stretching and bending, and fully enhances the application of PLA used as material.
Description
Technical field
The invention belongs to the bionic structure preparation field of macromolecular material, particularly relate to the method that a kind of degradable plastics PLA forms concba lamellar structure.
Background technology
PLA (PLA) caused a large amount of research of vast researcher, but the fragility of PLA material has but limited its application as degradable, reproducible bioabsorbable polymer material.Generally improve the fragility of PLA material by blend, copolymerization and compound etc., with reasonable orientation by multiple dimensioned structure, arrange the mechanical property that increases macromolecular material, as: the spider silk that protein is formed can become the best macromolecular material of toughness, and prevailing polyethylene can prepare the high-strength high-modulus fibre that specific strength is higher than steel.In recent years, along with the research to biological structure, bionic structure is paid close attention to widely.
Nature is in the evolution of long period of time evolution process, and the aragonite crystal in the nacre of shell shows the order of height in multistage yardstick level (from nanometer to tens of micron), so mechanical property is higher much than aragonite crystal, is common CaCO as its toughness
3Crystal 3000 surplus times.A large amount of mathematics model analysis and experimental studies show that the ordered laminar brick wall structure is the important foundation of shell strong mechanical performance.Therefore, the wide variety of materials scientist is studying the ordered laminar brick wall microstructure that how to form as shell in synthetic material in recent years.
In general, on the macroscopic scale, laminate fabric strengthens polymer composites, and important effect has been brought into play in not only strong but also many fields light material at needs; On the micron level, in the nano composite material of inorganic silicate (if you would take off soil) as reinforcing material and polymeric matrix formation, by intercalation the sheet clay is peeled off and be dispersed in the polymeric matrix, given material very high strength and stiffness; On nanometer level, the composite that graphite unimolecule (graphene) patch unit structure and macromolecule form has been given the mechanical property of material excellence; On molecular level, the synthetic material that fragrance sheet molecule strengthens the flexible molecule chain also has excellent mechanical property, but this interpolation sheet strengthens the composite that body forms, general laminated structure unit is a random orientation, influenced the performance that strengthens effect, and, influence the performance of material because agglomeration causes the defective of material.
Summary of the invention
The purpose of this invention is to provide the method that a kind of degradable plastics PLA forms concba lamellar structure, this method can reach toughness reinforcing purpose from bionic structure, and the material surface of preparing is smooth, improved the appearance property of goods, because the formation of shell layered microstructure has improved the mechanical properties such as impact, stretching and bending of material, promoted the widespread popularity of PLA simultaneously as material comprehensively.
A kind of degradable plastics PLA of the present invention forms the method for concba lamellar structure, may further comprise the steps:
(1) at 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition;
(2) with the PLA batten of injection formed, be cut into rectangular shape;
(3) the PLA batten for preparing is put into the cavity middle part of mould, polymer low-temperature pressure induction occurs and flows under 0-170 ℃, 0-150min and the 0-1000MPa pressure, finally forms the structurized PLA of microcosmic shell layer.
The intrinsic viscosity of the degradable plastics PLA in the described step (1) is that 1.08736dL/g, fusing point are 168 ℃;
Degradable plastics PLA batten shape in the described step (1) is 80mm * 10mm * 4mm;
Rectangular shape in the described step (2) is 35mm * 10mm * 4mm;
Mould internal cavity in the described step (3) is the cuboid of 80mm * 10mm * 4mm;
The intrinsic viscosity of PLA after the formation microcosmic shell layer structure in the described step (3) is that 1.0658dL/g, fusing point are 168 ℃.
In the described step (3) 0-170 ℃ of preferred 50-150 ℃;
The preferred 5-20min of 0-150min in the described step (3);
The preferred 100-700MPz of 0-1000MPa in the described step (3);
This method can be processed by methods such as mold pressing, punching press or continous ways on vulcanizer, forcing press equal pressure equipment.
Description of drawings
The impact section of Fig. 1 PLA former state
The surface of the pearl layer structure of Fig. 2 PLA
The cross section of the pearl layer structure of Fig. 3 PLA
The microstructure of Fig. 4 shell pearl layer
The impact section of Fig. 5 PLA former state
The impact section that Fig. 6 PLA processes under 150MPa pressure
The impact section that Fig. 7 PLA acid is processed under 300MPa pressure
Impact section behind Fig. 8 PLA heat treatment 20min
Impact section behind Fig. 9 PLA heat treatment 90min
The specific embodiment
The invention will be further elaborated below in conjunction with specific embodiment, should be understood that these embodiment only are used to the present invention is described and are not used in to limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalences fall within the application's appended claims institute restricted portion equally.
Embodiment 1
At 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition; With the PLA batten of injection formed, be cut into the rectangular shape of 35mm * 10mm * 4mm; The PLA batten for preparing is put into the cavity body of mould middle part that cavity is 80mm * 10mm * 4mm; Under the pressure of 50 ℃ and 1.2GPa, compacting 5min, formed solid forms the structurized PLA of microcosmic shell layer.Fig. 1 is the microstructure of the PLA batten of injection moulding preparation, and Fig. 2,3 is the shell layered microstructure pattern of the PLA behind the formed solid, and Fig. 4 is the microstructure of concba lamellar structure.
Embodiment 2
At 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition; With the PLA batten of injection formed, be cut into the rectangular shape of 35mm * 10mm * 4mm; The PLA batten for preparing is put into the cavity body of mould middle part that cavity is 80mm * 10mm * 4mm; At 110 ℃, the pressure condition of 300MPa keeps 5min down, and formed solid forms the structurized PLA of microcosmic shell layer, and the mechanical property without heat treated PLA batten after the moulding is as follows:
| The crystallization time that batten is 100 ℃ (min) | Impact strength (the kJ/m of processing back batten 2) | Impact strength (the kJ/m of original batten 2) |
| 0 | 16.15 | 9.99 |
| 10 | 20.50 | 11.09 |
| 20 | 35.93 | 14.73 |
| 40 | 40.40 | 15.02 |
| 60 | 23.77 | 13.39 |
| 240 | 22.19 | 19.06 |
Embodiment 3
At 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition; With the PLA batten of injection formed, be cut into the rectangular shape of 35mm * 10mm * 4mm; The PLA batten for preparing is put into the cavity body of mould middle part that cavity is 80mm * 10mm * 4mm; At 110 ℃, the size that changes pressure keeps 5min (cross section pattern such as Fig. 5,6,7) with the PLA blank of crystallization 40min, and the mechanical property without the heat treatment batten after the moulding is as follows:
Impact strength (the kJ/m of the tonnage of batten (MPa) batten
2)
0 13.39
75 22.45
150 38.03
250 46.25
375 37.91
600 40.82
Embodiment 4
At 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition; With the PLA batten of injection formed, be cut into the rectangular shape of 35mm * 10mm * 4mm; The PLA batten for preparing is put into the cavity body of mould middle part that cavity is 80mm * 10mm * 4mm; Under different temperatures, the 300MPa pressure condition is implemented 5min down with the PLA homopolymers blank of crystallization 40min, and the mechanical property without the heat treatment batten after the moulding is as follows:
The processing temperature of batten (℃) impact strength (kJ/m of batten
2)
0 18.60
50 16.01
70 21.82
90 33.25
110 49.49
130 32.94
150 10.84
Embodiment 5
At 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition; With the PLA batten of injection formed, be cut into the rectangular shape of 35mm * 10mm * 4mm; The PLA batten for preparing is put into the cavity body of mould middle part that cavity is 80mm * 10mm * 4mm; At 110 ℃, the pressure condition of 300MPa is implemented 5min down with the PLA homopolymers blank of crystallization 40min, and the mechanical property at the batten (cross section pattern such as Fig. 8,9) of 100 ℃ of heat treatment different times after the moulding is as follows:
Impact strength (the kJ/m of the heat treatment time of batten (min) batten
2)
10 41.25
20 41.99
40 43.37
60 45.28
90 61.86
150 60.93
Claims (7)
1. a degradable plastics PLA forms the method for concba lamellar structure, may further comprise the steps:
(1) at 150-200 ℃, injection pressure is an injection moulding degradable plastics PLA batten under 60bar～160bar condition;
(2) with the PLA batten of injection formed, shear 35mm * 10mm * 4mm rectangular shape;
(3) the PLA batten for preparing is put into the cavity middle part of mould, polymer low-temperature pressure induction occurs and flows under 0-170 ℃, 0-150min and the 0-1000MPa pressure, forms the structurized PLA of microcosmic shell layer;
(4) the PLA batten of preparation is handled the different time at 50-100 ℃.
2. a kind of degradable plastics PLA according to claim 1 forms the method for concba lamellar structure, it is characterized in that the intrinsic viscosity of the degradable plastics PLA in the described step (1) is that 1.08736daL/g, fusing point are 168 ℃.
3. a kind of degradable plastics PLA according to claim 1 forms the method for concba lamellar structure, it is characterized in that the degradable plastics PLA batten shape in the described step (1) is 80mm * 10mm * 4mm.
4. a kind of degradable plastics PLA according to claim 1 forms the method for concba lamellar structure, it is characterized in that the mould internal cavity in the described step (3) is the cuboid of 80mm * 10mm * 4mm.
5. a kind of degradable plastics PLA according to claim 1 forms the method for concba lamellar structure, it is characterized in that the intrinsic viscosity of the PLA after the formation microcosmic shell layer structure in the described step (3) is that 1.0658dL/g, fusing point are 168 ℃.
6. a kind of degradable plastics PLA according to claim 1 forms the method for concba lamellar structure, it is characterized in that middle 50-150 ℃ of described step (3), 5-20min, 0.1-1000MPa.
7. a kind of degradable plastics PLA according to claim 1 forms the method for concba lamellar structure, it is characterized in that press device is vulcanizer or forcing press, processes by mold pressing, punching press or continous way.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100480583A CN100566978C (en) | 2007-11-09 | 2007-11-09 | A kind of degradable plastics PLA forms the method for concba lamellar structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100480583A CN100566978C (en) | 2007-11-09 | 2007-11-09 | A kind of degradable plastics PLA forms the method for concba lamellar structure |
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| Publication Number | Publication Date |
|---|---|
| CN101157273A true CN101157273A (en) | 2008-04-09 |
| CN100566978C CN100566978C (en) | 2009-12-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069590A (en) * | 2009-11-25 | 2011-05-25 | 中原工学院 | Method for toughening and enhancing crystalline polypropylene |
| CN102189618A (en) * | 2010-03-16 | 2011-09-21 | 中原工学院 | Method for increasing mechanical property of PA66 by forced solid flow |
| WO2014124562A1 (en) * | 2013-02-18 | 2014-08-21 | 美亚无纺布工业有限公司 | Degradable recycling material |
| WO2014124563A1 (en) * | 2013-02-18 | 2014-08-21 | 美亚无纺布工业有限公司 | Biodegradable film and laminate |
-
2007
- 2007-11-09 CN CNB2007100480583A patent/CN100566978C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069590A (en) * | 2009-11-25 | 2011-05-25 | 中原工学院 | Method for toughening and enhancing crystalline polypropylene |
| CN102189618A (en) * | 2010-03-16 | 2011-09-21 | 中原工学院 | Method for increasing mechanical property of PA66 by forced solid flow |
| WO2014124562A1 (en) * | 2013-02-18 | 2014-08-21 | 美亚无纺布工业有限公司 | Degradable recycling material |
| WO2014124563A1 (en) * | 2013-02-18 | 2014-08-21 | 美亚无纺布工业有限公司 | Biodegradable film and laminate |
| RU2640243C2 (en) * | 2013-02-18 | 2017-12-27 | Ю.С. Пасифик Нонвоувенс Индастри Лимитед | Biodegradable film and laminate |
| US9994686B2 (en) | 2013-02-18 | 2018-06-12 | U.S. Pacific Nonwovens Industry Limited | Biodegradable film and laminate |
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| Publication number | Publication date |
|---|---|
| CN100566978C (en) | 2009-12-09 |
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Granted publication date: 20091209 Termination date: 20161109 |