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Biodegradable polylactic acid-starch heat-resistant composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of polylactic acid-starch composite material and its preparation, to achieve the effect of good molding and processing performance

Active Publication Date: 2011-12-07
WUHAN HUALI ENVIRONMENT PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101343406A uses polylactic acid and starch as the main raw materials, and prepares a temperature-resistant polylactic acid-starch alloy fully biodegradable material by modifying starch, modified polylactic acid, and adding various additives, but the temperature resistance is only improved to 85 ℃, still can not be used to make rice plates, soup bowls, cups and other products that require high heat resistance temperature

Method used

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  • Biodegradable polylactic acid-starch heat-resistant composite material and preparation method thereof
  • Biodegradable polylactic acid-starch heat-resistant composite material and preparation method thereof
  • Biodegradable polylactic acid-starch heat-resistant composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Add 20 parts of cornstarch, 1 part of polyvinyl alcohol, 1 part of maltitol and 1 part of water into a high-speed mixer with strong circulation according to the proportion, stir at 55 °C for 20 minutes, mix well, and cool down. material.

[0028] Add the mixture obtained above, 70 parts of polylactic acid, 1 part of ADK Stab Na-21, 2 parts of Biomax Thermal 300, 3 parts of SMA, and 1 part of super BPO into a high-speed mixer, mix evenly at 50 ° C, and dry , to get the mixture,

[0029] Then the above mixture is added to the twin-screw extruder, the ratio of length to diameter is 35:1, the screw speed is 200-300 rpm, and the temperature of each section is 150°C, 165°C, 170°C, 180°C, 170°C , 160°C, the vacuum degree of each section is extruded and granulated under the condition of 0.03 MPa, the mixture obtained above,

[0030] The pellets were then irradiated with 70KGy using gamma rays.

[0031] The tensile strength of the obtained composite material is 30MPa, the elo...

Embodiment 2～4

[0034]

Embodiment 5～7

[0036]

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Abstract

The invention relates to a biodegradable polylactic acid-starch thermal-resistance composite material and a preparation method thereof. The biodegradable polylactic acid-starch thermal-resistance composite material consists of the following raw material components in part by weight: 20 to 80 parts of natural starch, 10 to 70 parts of polylactic acid, 1 to 10 parts of polyvinyl alcohol, 1 to 5 parts of plasticizer, 1 to 10 parts of water, 1 to 5 parts of thermal-resistance modifier, 1 to 5 parts of nucleating agent, 1 to 5 parts of compatilizer and 1 to 5 parts of crosslinking agent. The preparation process comprises: mixing raw material; extruding to form grains; irradiating by gamma rays; and the like. The composite material disclosed by the invention has high mechanical properties. The tensile strength of the composite material is 20 to 35MPa, the elongation at break is 10 to 20 percent and the heat distortion temperature is 90 to 120 DEG C. In addition, the composite material has high environmental degradability, high forming and processing performance, and can be formed into various products by extrusion, plastic injection, thermal pressing and other means on common plastic processing equipment.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a heat-resistant biodegradable polylactic acid-starch composite material and a preparation method thereof. Background technique [0002] A large number of ordinary petrochemical plastic products with excellent performance and low price have seriously polluted the living environment of human beings. At the same time, global oil resources are increasingly depleted, making the use of renewable resources to prepare biodegradable materials is an inevitable choice to solve environmental and energy problems. And in recent years, it has also become the focus of research and development and attention of many countries and enterprises, and some biodegradable materials continue to emerge. [0003] Among the existing fully biodegradable materials, polylactic acid and starch derived from natural resources have attracted special attention due to their own advantages. As a natural po...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L67/04C08L29/04B29B9/06B29C47/92C08J3/28B29C48/92
CPCB29C48/40B29C48/875B29C48/92B29C2948/92514B29C2948/92704B29C2948/92895
Inventor 王淑敏危伟张立斌
Owner WUHAN HUALI ENVIRONMENT PROTECTION SCI & TECH
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