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Completely biodegradable composite material and preparation method thereof

A composite material and biodegradable technology, applied in the field of preparation of degradable plastics, can solve the problems of high price of polylactic acid and limited application, and achieve the effects of simple preparation method and technological process, improved compatibility and low price

Inactive Publication Date: 2011-07-27
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid is more expensive than general-purpose plastic resins, which limits its application in the field of plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 55 parts by mass of poly-L-lactic acid (number average molecular weight 80,000), 30 parts by mass of cornstarch, 10 parts by mass of compatibilizer (PLA-g-MAH), 5 parts by mass of reactive plasticizer (epoxidized soybean oil) Pre-mix with a high-speed mixer for 5 minutes, then extrude the pre-mixed mixture with a co-rotating twin-screw extruder, cool, granulate, and dry. The processing temperature of the co-rotating twin-screw extruder is 160 ~ 175 ℃, and the screw speed is 90 rpm.

[0018] The tensile yield strength of the prepared composite was 41.9MPa, and the elongation at break was 10.7%, which were 44.5% and 229.2% higher than those without adding compatibilizer and reactive plasticizer, respectively.

[0019] The degradation cycle is about 5 months, which is 8 months faster than that of pure polylactic acid.

[0020] Poly L-lactic acid is 25,000 yuan / ton, corn starch is 3,000 yuan / ton, PLA-g-MAH is 32,000 yuan / ton, epoxy soybean oil is 8,800 yuan / ton, and the pr...

Embodiment 2

[0022] 70 parts by mass of poly DL-lactic acid (number average molecular weight is 80,000), 20 parts by mass of wheat starch, 8 parts by mass of compatibilizer (PLA-g-AA), 2 parts by mass of reactive plasticizer (epoxy fatty acid octyl ester ) with a high-speed mixer for 5 minutes, and then add the pre-mixed mixture to the co-rotating twin-screw extruder for extrusion and granulation. The processing temperature of the co-rotating twin-screw extruder is 160 ~ 175 ℃, and the screw speed is 90 rpm.

[0023] The tensile yield strength of the prepared composite was 42.6MPa, and the elongation at break was 8.1%, which were 33.1% and 91.8% higher than those without adding compatibilizer and reactive plasticizer, respectively.

[0024] The degradation cycle is about 7.5 months, which is 5.5 months faster than that of pure polylactic acid.

[0025] Poly DL-lactic acid is 36,000 yuan / ton, wheat starch is 3,000 yuan / ton, PLA-g-AA is 33,000 yuan / ton, epoxy fatty acid octyl ester is 8,800...

Embodiment 3

[0027] 50 parts by mass of poly L-lactic acid (number average molecular weight is 80,000), 40 parts by mass of tapioca starch or cereal starch, 5 parts by mass of compatibilizer (SEBS-g-MAH), 5 parts by mass of reactive plasticizer (linseed Oil) is pre-mixed with a high-speed mixer for 5 minutes, and then the pre-mixed mixture is added to a co-rotating twin-screw extruder for extrusion and granulation. The processing temperature is 160 ~ 175 ℃, and the screw speed is 90 rpm.

[0028] The tensile yield strength of the prepared composite was 30.3MPa, and the elongation at break was 8.6%, which were 26.3% and 186.7% higher than those without adding compatibilizer and reactive plasticizer, respectively.

[0029] The degradation period is about 4.5 months, which is 8.5 months faster than that of pure polylactic acid.

[0030] Poly L-lactic acid is 25,000 yuan / ton, cassava starch or cereal starch is 3,000 yuan / ton, SEBS-g-MAH is 32,000 yuan / ton, linseed oil is 10,000 yuan / ton, and t...

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Abstract

The invention provides a completely biodegradable composite material and a preparation method thereof and relates to the technical field of biodegradation. The completely biodegradable composite material is prepared by the following steps of: mixing 35-88% of polylactic acid, 10-50% of starch, 1-10% of compatibilizer and 1-5% of reaction type plasticizer; extruding the mixture through a double-screw extruder; cooling, pelleting and drying. An interfacial compatibilizer can be used for greatly improving the interfacial binding force between the polylactic acid and the starch, and the reaction type plasticizer can be used for improving the tensile strength and increasing the breaking elongation rate of the composite material. The prepared composite material has the advantages of excellent mechanical performances, biological compatibility and low price and can be completely biodegradable; moreover, the composite material can be widely applied to the preparation in fields such as agriculture, hygiene, engineering materials, packaging materials, tableware and the like, has market application potential, and belongs to a novel material characterized in high environment friendliness.

Description

technical field [0001] The invention relates to the technical field of preparation of degradable plastics. Background technique [0002] Due to its light weight, high strength, and low price, plastics have been rapidly developed and widely used in the packaging field since the 1970s. However, plastics that use petroleum as raw materials tend to produce a large amount of harmful substances when incinerated. It is extremely difficult to degrade, causing serious "white pollution", and the petroleum resources are non-renewable. Excessive consumption will cause resource shortage and destroy the ecological balance. Therefore, the development of biodegradable plastics has attracted widespread attention from scientists from all over the world. But so far, due to comprehensive performance and cost factors, degradable materials cannot replace petroleum-derived plastics in a short period of time. At present, although the degradation performance of starch-filled plastics has been impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08L51/08C08L51/00C08L51/06C08K5/1515C08K5/09C08K5/15B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92
Inventor 朱爱萍刁华鑫
Owner YANGZHOU UNIV
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