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Heat-proof polylactic acid blend and preparation method thereof

A technology of polylactic acid and blends, which is applied in the field of polymer materials, can solve the problems of inability to meet heat resistance requirements, non-biodegradable, and limited improvement range, and achieve low cost, excellent mechanical properties, and good heat resistance. performance effect

Active Publication Date: 2008-04-09
ZHEJIANG HISUN BIOMATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application (CN99119441) improves its heat resistance and other mechanical properties through the copolymerization reaction between polylactic acid and aliphatic and / or aliphatic polyester carbonate; although the above-mentioned technology can realize the improvement of polylactic acid heat resistance, However, the range of improvement is limited, and it cannot meet the requirements of some products with high heat resistance; such as tableware used in hot meals, etc.
However, the blended heat-resistant polymers styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer or polycarbonate used in this technology are not biodegradable and will still decompose after use and disposal. Pollution to the environment. In addition, the polylactic acid blended by this technology is amorphous polylactic acid, so the improvement of heat resistance is limited.

Method used

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  • Heat-proof polylactic acid blend and preparation method thereof
  • Heat-proof polylactic acid blend and preparation method thereof
  • Heat-proof polylactic acid blend and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A, mixing: mix according to the composition of the weight portion of embodiment 1 in table 1, put into high-speed mixer after mixing and stir evenly;

[0037] B, internal mixing: put the above-mentioned blended ingredients into an internal mixer for internal mixing, wherein the internal mixing temperature is 150°C, and the internal mixing time is 20 minutes;

[0038] C. Hot press forming: hot pressing the above-mentioned resin after banburying at a temperature of 150° C. and a pressure of 15 MPa to obtain a sheet with a thickness of 1.0 mm;

[0039] D. Isothermal crystallization: The heat-resistant polylactic acid blend was obtained after isothermally crystallizing the above-mentioned hot-pressed sheet at a temperature of 60°C for 5 minutes. The thermal properties are shown in Table 2.

Embodiment 2

[0041] A, mixing: mix according to the composition of the weight portion of embodiment 2 in table 1, put into high-speed mixer after mixing and stir evenly;

[0042] B, internal mixing: put the above-mentioned blended ingredients into an internal mixer for internal mixing, wherein the internal mixing temperature is 170°C, and the internal mixing time is 10 minutes;

[0043] C. Hot press molding: hot press molding the above-mentioned resin after banburying at a temperature of 180° C. and a pressure of 10 MPa to obtain a sheet with a thickness of 1.0 mm;

[0044] D. Isothermal crystallization: The heat-resistant polylactic acid blend was obtained after isothermally crystallizing the above-mentioned hot-pressed sheet at a temperature of 90°C for 70 minutes. The mechanical properties and resistance The thermal properties are shown in Table 2.

Embodiment 3

[0046] A, mixing: mix according to the composition of the weight portion of embodiment 3 in table 1, put into high-speed mixer after mixing and stir evenly;

[0047] B, internal mixing: put the above-mentioned blended ingredients into an internal mixer for internal mixing, wherein the internal mixing temperature is 190°C, and the internal mixing time is 5 minutes;

[0048] C. Hot press molding: hot press molding the above-mentioned resin after banburying at a temperature of 200° C. and a pressure of 8 MPa to obtain a sheet with a thickness of 1.0 mm;

[0049] D. Isothermal crystallization: The heat-resistant polylactic acid blend was obtained after isothermal crystallization of the above-mentioned hot-pressed sheet at a temperature of 120°C for 120 minutes. The thermal properties are shown in Table 2.

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Abstract

The invention provides a heat-resistant polylactic acid blend and a preparation method thereof, pertaining to the polymer materials technique field, solving the problems of bad heat-resistant performance, weak mechanical performance and being not to be biodegraded, etc. The heat-resistant polylactic acid blend consists of the following components according to weight proportion: 100 parts of polylactic acid, 5 parts to 100 parts of heat-resistant polymer materials which can be biodegraded, 0 to 100 parts of fillers; the preparation method is that: A. blending; B. banburying; C. hot pressing forming; D. isothermal crystallization. The heat-resistant polylactic acid blend of the invention uses the polylactic acid which has a synergistic effect between crystallization and heat-resistant components, and therefore the invention has good heat-resistant performance. The invention adopts various components matching use, so the blend can not only be biodegraded, but also has good mechanical performance; the whole preparation method has simple technical process, good processing performance, low cost and can realize large-scale and industrialized production.

Description

technical field [0001] The invention relates to a polyester composite material and a preparation method thereof, in particular to a heat-resistant polylactic acid blend and a preparation method thereof; belonging to the technical field of polymer materials. Background technique [0002] The negative impact of waste of polymer materials on the environment has aroused people's widespread concern, and solving the increasingly serious "white pollution" problem has become a common concern of people. Therefore, the research and development of degradable plastics at home and abroad are very active, and some of them have started industrial production, and the development is quite rapid. Biodegradable plastics not only have the excellent performance of the plastic itself when used, but also do not pollute the environment when discarded after use, and can be quickly decomposed by various organisms (enzymes). Therefore, vigorously developing and promoting biodegradable polymer materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/26B29C51/00C08L67/00
Inventor 韩常玉陈志明白骅董丽松
Owner ZHEJIANG HISUN BIOMATERIALS
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