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Polylactic acid-starch foaming material and preparation method thereof

A foaming material and polylactic acid technology, applied in the field of foamable materials, can solve the problems of poor mechanical properties, low foaming rate of foamed materials, and high cost, achieve good mechanical strength and water resistance, improve mixing effect, increase The effect of foaming rate

Inactive Publication Date: 2007-02-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polylactic acid is a biodegradable polymer with good comprehensive performance, but its price is high, and the cost of directly using it as a solid disposable appliance is relatively high. If it can be made into foamed products, the cost can be reduced and the improvement can be improved. Mechanical properties, but its own poor foamability
Moreover, polylactic acid has poor water resistance at high temperatures. In the previous polylactic acid-starch composite foaming technology, due to the degradation of polylactic acid, the resulting foamed material has low foaming rate and poor mechanical properties, so it has not been substantially applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 2 kg of L-polylactic acid, using co-rotating twin-screw extruder at 180°C-180°C-180°C-160°C-140°C temperature distribution, screw length 700mm, speed 120rpm, fully melted and cooled to 140 ℃. Add 20% moisture (in terms of starch dry basis) to 2 kilograms of starch. In another twin-screw extruder, the temperature distribution is 80°C-120°C-140°C-140°C, the screw length is 700mm, and the rotating speed is 120rpm. After gelatinization, the aforementioned molten polylactic acid is introduced into another twin-screw extruder. Each temperature zone of the extruder is controlled at 140°C. A high-efficiency mixing element is installed in the extruder. After the materials are mixed, they pass through a 4mm diameter The circular die mouth is directly puffed, and the puffed product is cut into a length of about 50mm by a rotary blade, and the puffing ratio and water absorption are measured after drying at a temperature of 60°C.

Embodiment 2

[0021] 2 kg of L-polylactic acid, fully melted and moderately cooled to 140°C. Add 20% water (based on starch dry basis) to 1 kg of starch. In another similar twin-screw extruder, the temperature distribution is 80°C-120°C-140°C-140°C, the screw length is 700mm, and the rotation speed is 120rpm. , after fully gelatinized, the aforementioned molten polylactic acid is introduced into another twin-screw extruder, and each temperature zone of the extruder is controlled at 140°C. A high-efficiency mixing element is set in the extruder. After the materials are mixed, they pass through a diameter It is a 4mm circular die, directly puffed, and the puffed product is cut into a length of about 50mm by a rotary blade, and its expansion ratio and water absorption are measured after drying at a temperature of 60°C.

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Abstract

The invention discloses a polylactic-starch epispastic material and preparing method, which comprises the following steps: melting the polylactic and starch; mixing up with sparkle to form foam article with water resisting property and high frothing percentage. The invention can reduce the retrogradation of the polylactic, which improves the frothing percentage of the polylactic-starch.

Description

technical field [0001] The invention relates to the field of foaming materials, in particular to a polylactic acid-starch foaming material and a preparation method thereof. Background technique [0002] With the development of society, people use more and more disposable packaging, decoration materials, tableware and other disposable materials. The foam packaging materials developed in the early stage are all based on petrochemical products. Although they are cheap, they are not degradable. Very poor, causing so-called white pollution. In order to eliminate white pollution, people have developed photodegradable packaging materials on the basis of petroleum-based polymer materials. Under the action of light, photodegradable materials can be degraded into fine fragments to eliminate visual pollution, but it still takes decades or even hundreds of years for these fragments to be degraded by microorganisms, and the refractory polymer fragments caused by photodegradation Block ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02B29C47/36B29C47/62
Inventor 周家华
Owner SOUTH CHINA AGRI UNIV
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