CN105419263A - Preparation method for polylactic acid/starch compound foam material - Google Patents
Preparation method for polylactic acid/starch compound foam material Download PDFInfo
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- CN105419263A CN105419263A CN201410489544.9A CN201410489544A CN105419263A CN 105419263 A CN105419263 A CN 105419263A CN 201410489544 A CN201410489544 A CN 201410489544A CN 105419263 A CN105419263 A CN 105419263A
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- polylactic acid
- foam material
- composite foam
- starch
- starch composite
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Abstract
The present invention discloses a preparation method for a polylactic acid/starch compound foam material. The material comprises the following components in parts by weight: 5-25 parts of starch, 65-85 parts of polylactic acid, 1-2 parts of an AC foaming agent, 0.5-1 part of a nucleating agent, 2-3 parts of maleic anhydride, 1-2 parts of an initiator L-101, 0.5-1 part of BPO and 0.5-1 part of titanium dioxide. The preparation method comprises: first drying PLA and corn starch in a 70 DEG C oven for 4h, mixing uniformly the two in a proportion, then adding a certain amount of the initiator liquid L-101 into mixed particles and stirring the mixture for 3 minutes to uniformly moisten the particle surface, finally uniformly mixing the AC foaming agent, the nucleating agent SiO2, titanium dioxide, maleic anhydride and BPO in a proportion and pouring the mixture into a beaker filled with mixed particles, stirring the mixture for 5 minutes to cause the powdered solid to be uniformly covered on the PLA particle surface, and then extruding, foaming and moulding the mixture in a twin-screw extruder, a fusion extrusion temperature being 160- 170 DEG C and a screw rotational speed sustained at 100 rpm.
Description
technical field:
The invention belongs to the field of polymer composite material in Materials science, relate to a kind of method utilizing starch to prepare high-foaming performance lactic acid composite material.Polylactic acid/starch composite foam material prepared by the present invention, obviously become large than the cell density of pure poly(lactic acid), foam performance is significantly improved.Method involved in the present invention performance controllability simple to operate, that prepare material is strong, and be applicable to laboratory and enterprise's industrialization production, this material is a kind of poly(lactic acid) composite foam material of high-foaming performance.
background technology:
At home, the report about porous plastics has carried out comparatively extensive research, but traditional petroleum foam material is not easily degraded, and their potential degradable products also can cause environment and have a strong impact on.Therefore, people start sight to turn to green biodegradable polymer material.Poly(lactic acid) (PLA) is a kind of thermoplasticity Biodegradable material, is widely used for a long time, and by feat of higher strength and modulus, is considered as being a kind of environmental friendliness wrapping material with great potential in recent years by people at biomedicine field.
Starch is the biological polymer that nature is only second to cellulosic second largest plentifulness, and its extremely low cost and Wholly-degradable cause people and pay close attention to greatly.Poly(lactic acid) and starch are carried out checking foaming, is expected to the conventional foams that replacement take EPS as representative, there are high market outlook.
summary of the invention:
The object of the invention is for solving starch water-absorbent strong, mechanical property is not enough, and under physical environment, spatial stability is inadequate, its polylactic acid modified method of one being restricted as the application of foam material separately and providing.
Realizing the object of the invention technical solution is polylactic acid modified method, first by PLA, W-Gum at 70 DEG C of baking oven inner drying 4h, mix in proportion, then a certain amount of initiator liquid L-101 to be added in stuff and other stuff and stir 3min and make particle surface be able to uniform wet.Finally by AC whipping agent, nucleator SiO
2, titanium dioxide, maleic anhydride and BPO pour the beaker holding composite grain into after Homogeneous phase mixing in proportion, stirring 5min makes pulverulent solids evenly wrap up in and is attached to PLA particle surface, then foam shaping by extrusion in twin screw extruder, melt extrude temperature 160-170 DEG C, screw speed should maintain 100rpm.
Component and the components by weight percent number proportioning of high-foaminess lactic acid composite material are: PLA accounts for a 65-85% for oeverall quality, and starch accounts for the 5-25% of oeverall quality;
The number-average molecular weight of described poly(lactic acid) is 40-50 ten thousand;
Described whipping agent is AC whipping agent, and addition is the 1%-2% of total mass;
That described initiator is chosen is L-101 and BPO, and addition is respectively 1%-2% and 0.5%-1% of total mass;
Described nucleator is nano level SiO
2, addition is the 0.5%-1% of total mass.
embodiment:
Embodiment one:
Table 1 basic recipe
| PLA | Starch | Whipping agent | Nucleator | Maleic anhydride | Initiator (BPO) | Initiator (L-101) | Titanium dioxide |
| 85 parts | 5 parts | 1-2 part | 0.5-1 part | 2-3 part | 0.5-1 part | 1-2 part | 0.5-1 part |
First by PLA, W-Gum at 70 DEG C of baking oven inner drying 4h, mix in proportion, then a certain amount of initiator liquid L-101 to be added in stuff and other stuff and stir 3min and make particle surface be able to uniform wet.Finally by AC whipping agent, nucleator SiO
2, titanium dioxide, maleic anhydride and BPO pour the beaker holding composite grain into after Homogeneous phase mixing in proportion, stir 5min and pulverulent solids evenly wrapped up in be attached to PLA particle surface, then foam shaping by extrusion in twin screw extruder.
Embodiment two:
Table 2 basic recipe
| PLA | Starch | Whipping agent | Nucleator | Maleic anhydride | Initiator (BPO) | Initiator (L-101) | Titanium dioxide |
| 80 parts | 10 parts | 1-2 part | 0.5-1 part | 2-3 part | 0.5-1 part | 1-2 part | 0.5-1 part |
Processing condition are as embodiment one.
Embodiment three:
Table 3 basic recipe
| PLA | Starch | Whipping agent | Nucleator | Maleic anhydride | Initiator (BPO) | Initiator (L-101) | Titanium dioxide |
| 75 parts | 15 parts | 1-2 part | 0.5-1 part | 2-3 part | 0.5-1 part | 1-2 part | 0.5-1 part |
Processing condition are as embodiment one.
Embodiment four:
Table 4 basic recipe
| PLA | Starch | Whipping agent | Nucleator | Maleic anhydride | Initiator (BPO) | Initiator (L-101) | Titanium dioxide |
| 70 parts | 20 parts | 1-2 part | 0.5-1 part | 2-3 part | 0.5-1 part | 1-2 part | 0.5-1 part |
Processing condition are as embodiment one.
Embodiment five:
Table 5 basic recipe
| PLA | Starch | Whipping agent | Nucleator | Maleic anhydride | Initiator (BPO) | Initiator (L-101) | Titanium dioxide |
| 65 parts | 25 parts | 1-2 part | 0.5-1 part | 2-3 part | 0.5-1 part | 1-2 part | 0.5-1 part |
Processing condition are as embodiment one.
the performance test results:
| Test event | Unit | Embodiment one | Embodiment two | Embodiment three | Embodiment four | Embodiment five |
| Apparent density | g/cm 3 | 0.71 | 0.79 | 0.82 | 0.86 | 0.89 |
| Cell density | 10 5Individual/cm 3 | 5.1 | 6.5 | 14.3 | 15.4 | 23.6 |
Claims (7)
1. the method for a polylactic acid/starch composite foam material, be first by PLA, W-Gum at 70 DEG C of baking oven inner drying 4h, mix in proportion, then to be added by a certain amount of initiator liquid L-101 in stuff and other stuff and stir 3min and make particle surface be able to uniform wet, its acteristic weight than formula is: starch 5-25 part, poly(lactic acid) 65-85 part, AC whipping agent 1-2 part, nucleator 0.5-1 part, maleic anhydride 2-3 part, initiator L-1011-2 part and BPO0.5-1 part, and titanium dioxide 0.5-1.
2. a method for polylactic acid/starch composite foam material, described polylactic acid/starch composite foam material, the molecular weight of its PLA is chosen for 4 × 10
6-5 × 10
6poly(lactic acid), account for the 65%-85% of oeverall quality.
3. a method for polylactic acid/starch composite foam material, described polylactic acid/starch composite foam material, material modified what choose is starch, and its addition is the 5-25% of total mass.
4. a method for polylactic acid/starch composite foam material, described polylactic acid/starch composite foam material, the whipping agent chosen is AC whipping agent, and its addition is the 1%-2% of total mass.
5. a method for polylactic acid/starch composite foam material, described polylactic acid/starch composite foam material, the initiator chosen is L-101 and BPO, and its addition is respectively 1%-2% and 0.5%-1% of total mass.
6. a method for polylactic acid/starch composite foam material, described polylactic acid/starch composite foam material, the nucleator chosen is nano level SiO
2, its addition is the 0.5%-1% of total mass.
7. the method for a polylactic acid/starch composite foam material, described polylactic acid/starch composite foam material, its production technique comprises the following steps: first by PLA, W-Gum at 70 DEG C of baking oven inner drying 4h, mix in proportion, then being added by a certain amount of initiator liquid L-101 in stuff and other stuff and stirring 3min makes particle surface be able to uniform wet, finally by AC whipping agent, nucleator SiO
2, titanium dioxide, maleic anhydride and BPO pour the beaker holding composite grain into after Homogeneous phase mixing in proportion, stir 5min and pulverulent solids evenly wrapped up in be attached to PLA particle surface, then foam shaping by extrusion in twin screw extruder; The temperature of twin screw extruder is set to a district: 140-150 DEG C, 2nd district: 150-160 DEG C, 3rd district: 160-170 DEG C, 4th district: 165-175 DEG C, 5th district: 170-180 DEG C, 6th district: 170-180 DEG C, head: 170-280 DEG C, engine speed 100-200rpm, subsidiary engine rotating speed 10-15rpm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410489544.9A CN105419263A (en) | 2014-09-23 | 2014-09-23 | Preparation method for polylactic acid/starch compound foam material |
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| CN201410489544.9A CN105419263A (en) | 2014-09-23 | 2014-09-23 | Preparation method for polylactic acid/starch compound foam material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109503881A (en) * | 2018-10-27 | 2019-03-22 | 汕头市春叶新材料环保有限公司 | Degradable composite foam material of a kind of antibacterial starch base polyurethane/nano CuO and preparation method thereof |
| CN109880183A (en) * | 2019-03-12 | 2019-06-14 | 宁波百福得环保科技有限公司 | A kind of starch foaming packaging material and preparation method thereof with complete biodegradable characteristic |
| CN110920018A (en) * | 2019-11-21 | 2020-03-27 | 佛山碧嘉高新材料科技有限公司 | Polylactic acid foaming method |
| CN115926260A (en) * | 2022-12-28 | 2023-04-07 | 湖北格霖威新材料科技有限公司 | Preparation method of degradable high-strength closed-cell polylactic acid foam material |
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| CN1919926A (en) * | 2006-09-12 | 2007-02-28 | 华南农业大学 | Polylactic acid-starch foaming material and preparation method thereof |
| CN101747605A (en) * | 2008-10-31 | 2010-06-23 | 深圳市意可曼生物科技有限公司 | Complete biodegradation foam material and preparation method thereof |
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| CN1919926A (en) * | 2006-09-12 | 2007-02-28 | 华南农业大学 | Polylactic acid-starch foaming material and preparation method thereof |
| CN101747605A (en) * | 2008-10-31 | 2010-06-23 | 深圳市意可曼生物科技有限公司 | Complete biodegradation foam material and preparation method thereof |
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| 纪国营等: "聚乳酸/淀粉生物基复合材料的发泡", 《塑料》 * |
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| 袁华等: "聚乳酸/淀粉复合发泡材料的研究（II）：改性淀粉对复合材料相容性、流变性能和发泡性能影响", 《玻璃钢/复合材料》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109503881A (en) * | 2018-10-27 | 2019-03-22 | 汕头市春叶新材料环保有限公司 | Degradable composite foam material of a kind of antibacterial starch base polyurethane/nano CuO and preparation method thereof |
| CN109880183A (en) * | 2019-03-12 | 2019-06-14 | 宁波百福得环保科技有限公司 | A kind of starch foaming packaging material and preparation method thereof with complete biodegradable characteristic |
| CN110920018A (en) * | 2019-11-21 | 2020-03-27 | 佛山碧嘉高新材料科技有限公司 | Polylactic acid foaming method |
| CN115926260A (en) * | 2022-12-28 | 2023-04-07 | 湖北格霖威新材料科技有限公司 | Preparation method of degradable high-strength closed-cell polylactic acid foam material |
| CN115926260B (en) * | 2022-12-28 | 2024-01-26 | 湖北格霖威新材料科技有限公司 | Preparation method of degradable high-strength closed-cell polylactic acid foaming material |
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