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All-degradable thermoplastic starch/polylactic acid blend material and preparation method thereof

A technology of thermoplastic starch and polylactic acid, which is applied in the field of thermoplastic starch/polylactic acid blend materials and their preparation, can solve the problems of poor mechanical properties and heat resistance of materials, insignificant improvement, high production cost, etc., and achieve good mechanical properties, The effect of high production efficiency and low cost

Inactive Publication Date: 2013-06-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many invention patents on the blending of starch and polylactic acid in our country, but most of the patents use starch as a filler, and the amount of starch used is small, which will lead to high material preparation costs, such as Chinese patents CN101343406A discloses a temperature-resistant starch / polylactic acid alloy fully biodegradable material and a preparation method thereof. Although the thermal deformation temperature of the material reaches above 85°C, only 10-20% of the grafted modified starch is used, and the polylactic acid The middle filler component does not exceed 40 parts, and the cost is relatively high
There are also a small number of patents that modify starch to make it thermoplastic, so that a large proportion of modified starch can be added to the blended material, which reduces the cost, but the mechanical properties and heat resistance of the obtained materials are usually poor. Or only have insignificant improvement on the one hand, disclose a kind of thermoplastic starch and polylactic acid blend and preparation method thereof as Chinese patent CN102311562A, the compatibilizer that it uses is polyhydroxy ester ether, and this compatibilizer is to material The mechanical properties have been improved to some extent, but not obviously

Method used

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  • All-degradable thermoplastic starch/polylactic acid blend material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dry tapioca starch and polylactic acid; accurately weigh 40% of tapioca starch and 15% of glycerin, put them in a kneader, knead them at 110°C for 15 minutes, take them out, cool them, and crush them to obtain thermoplastic starch; accurately weigh polyethylene Put 1% alcohol in a round-bottomed flask, inject an appropriate amount of deionized water (to make the mass concentration of polyvinyl alcohol 1%), immerse the flask in a constant temperature water tank at 90°C and stir, and the polyvinyl alcohol will dissolve after 30 minutes. Place the thermoplastic starch and 2% of the weighed talcum powder in the round-bottomed flask, take out the residue in the round-bottomed flask after 30 minutes, and pulverize it with a pulverizer after drying; And accurately weighed polylactic acid 34%, GPOE7%, liquid paraffin 0.3%, lysozyme 0.7%, put it in a high-speed mixer and blend for 5 minutes, add the blend to a twin-screw extruder to extrude and granulate, and the extruder The te...

Embodiment 2

[0045]Dry tapioca starch and polylactic acid; accurately weigh 55% of tapioca starch and 18% of glycerin, place them in a kneader, knead at 120°C for 12 minutes, take them out, cool and crush them to obtain thermoplastic starch; accurately weigh polyethylene Put 2% alcohol in a round-bottomed flask, inject an appropriate amount of deionized water (to make the mass concentration of polyvinyl alcohol 4%), immerse the flask in a constant temperature water bath at 90°C and stir, and the polyvinyl alcohol will dissolve after 30 minutes. Put the thermoplastic starch and 5% of the weighed talcum powder in the round-bottomed flask, take out the residue in the round-bottomed flask after 30 minutes, and pulverize it with a pulverizer after drying; And accurately weighed polylactic acid 14%, GPOE 5%, liquid paraffin 0.2%, lysozyme 0.8% and blended in a high-speed mixer for 5 minutes, the blend was added to a twin-screw extruder for extrusion granulation, and the extruder The temperature ...

Embodiment 3

[0047] Dry tapioca starch and polylactic acid; accurately weigh 70% of tapioca starch and 14% of glycerin, put them in a kneader, knead them at 130°C for 8 minutes, take them out, cool them, and crush them to obtain thermoplastic starch; accurately weigh polyethylene Put 1% alcohol in a round-bottomed flask, inject an appropriate amount of deionized water (to make the mass concentration of polyvinyl alcohol 4%), immerse the flask in a constant temperature water bath at 90°C and stir, and the polyvinyl alcohol will dissolve after 30 minutes. Put the thermoplastic starch and 1% of the weighed talcum powder in the round bottom flask at the same time, take out the residue in the round bottom flask after 30 minutes, and pulverize it with a pulverizer after drying; And accurately weighed polylactic acid 8%, GPOE 5%, liquid paraffin 0.1%, lysozyme 0.9% and blended in a high-speed mixer for 5 minutes, the blend was added to a twin-screw extruder for extrusion granulation, and the extru...

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Abstract

The invention relates to a thermoplastic starch / polylactic acid blend material and a preparation method thereof. The thermoplastic starch / polylactic acid blend material is prepared from 40-84% of starch, 8-51% of polylactic acid, 0.2-8% of polyvinyl alcohol, 1-10% of toughener, 0.1-2% of lubricant, 5-30% of plasticizer, 0.1-5% of preservative and 1-10% of inorganic filler. The starch is modified to prepare the thermoplastic starch with excellent properties, the polyvinyl alcohol solution is utilized to pretreat the inorganic filler and thermoplastic starch, and the mixture is subjected to extrusion and granulation by a double screw extruder, and subjected to injection molding to obtain the thermoplastic starch / polylactic acid blend material. The thermoplastic starch / polylactic acid blend material has the advantages of low cost and pollution-free production process, and is all-degradable. The cantilever notch impact strength of the prepared material is 3.5-6.4 KJ / m<2>, the tensile strength is 19-60 MPa, the bending strength is 63-110 MPa, the heat-deformation temperature is 75.5-88.3 DEG C, and the weight loss rate after three-month degradation reaches higher than 90%.

Description

technical field [0001] The invention relates to the technical field of polymer blend materials, in particular to a fully degradable thermoplastic starch / polylactic acid blend material with high starch content and a preparation method thereof. Background technique [0002] Environmental issues have always been the focus of attention of cities and countries. Global warming, energy shortage, air pollution, population expansion and species extinction are threatening the living environment of human beings all the time. As the largest developing country in the world, China's environmental pollution cannot be underestimated. The rapid development of plastic materials in the 20th century is due to the fact that its raw material sources are based on abundant petrochemical products. According to relevant reports, the world's oil will face depletion in the middle of the 21st century. [0003] Starch is a natural polymer material, which has the advantages of wide source, cheap price, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L67/04C08L51/06C08L29/04C08K13/06C08K9/04C08K3/34C08K3/36
Inventor 汪济奎刘延昌司鹏翔汪宇明吴凯周旭张帝漆郭卫红
Owner EAST CHINA UNIV OF SCI & TECH
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