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High-strength high-toughness transparent polylactic acid composition and preparation method thereof

A polylactic acid and high toughness technology is applied in the field of high-strength and high-toughness transparent polylactic acid composition and its preparation, and achieves the effects of easy industrialization, good toughness and low cost

Inactive Publication Date: 2014-10-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature technology that can simultaneously achieve the above performance requirements

Method used

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  • High-strength high-toughness transparent polylactic acid composition and preparation method thereof
  • High-strength high-toughness transparent polylactic acid composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Firstly, the left-handed polylactic acid and the right-handed polylactic acid were vacuum-dried at 80°C for 8 hours for later use, and then 45g of left-handed polylactic acid, 5g of right-handed polylactic acid, 0.05g of antioxidant (1010) and 0.5g of compatibilizer (Bioadimide500XT) Pre-mixed evenly, and then the pre-mixture was melt-blended by an internal mixer at 200° C. for 5 minutes (rotor speed was 30 rpm), to obtain a high-strength and high-toughness transparent polylactic acid composition. The obtained polylactic acid composition is hot-pressed by a flat vulcanizer to obtain a 1 mm thick plastic sheet, and is cut into a standard sample according to relevant standards for mechanical performance testing, optical performance testing and thermal performance testing. The test results are listed in Table 1. In addition, the sheet was annealed at 100° C. for 3 minutes, and then the storage modulus of the polylactic acid composition sheet before and after heat treatment...

Embodiment 2

[0038] Firstly, the left-handed polylactic acid and the right-handed polylactic acid were vacuum-dried at 80°C for 8 hours for later use, and then 40 g of the left-handed polylactic acid, 10 g of the right-handed polylactic acid, 0.1 g of antioxidant (1010), and 0.02 g of antioxidant (168) and compatibilizer (Bioadimide500XT) 0.5g pre-mixed evenly, and then the pre-mixture was melt-blended by internal mixer at 200°C for 6 minutes (rotor speed is 40 rpm), to obtain a high-strength and high-toughness transparent polymer Lactic acid composition. The obtained polylactic acid composition is hot-pressed by a flat vulcanizer to obtain a 1 mm thick plastic sheet, and is cut into a standard sample according to relevant standards for mechanical performance testing, optical performance testing and thermal performance testing. The test results are listed in Table 1.

Embodiment 3

[0040] Firstly, the left-handed polylactic acid and the right-handed polylactic acid were vacuum-dried at 80°C for 8 hours for later use, and then the left-handed polylactic acid 45g, the right-handed polylactic acid 5g, the antioxidant (168) 0.05g and the compatibilizer (Bioadimide500XT) 0.5g Pre-mixed evenly, and then the pre-mixture was melt-blended by an internal mixer at 210° C. for 5 minutes (rotor speed was 30 rpm), to obtain a high-strength and high-toughness transparent polylactic acid composition. The obtained polylactic acid composition is hot-pressed by a flat vulcanizer to obtain a 1 mm thick plastic sheet, and is cut into a standard sample according to relevant standards for mechanical performance testing, optical performance testing and thermal performance testing. The test results are listed in Table 1.

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Abstract

The invention discloses a high-strength high-toughness transparent polylactic acid composition and a preparation method thereof. The high-strength high-toughness transparent polylactic acid composition is prepared from the following raw materials in parts by weight: 80-95 parts of levopolylactic acid, 5-20 parts of dextropolylactic acid, 0.05-1 part of antioxidant, 0.1-2 parts of solubilizer and 0-3 parts of other assistants. The polylactic acid composition prepared by the method provided by the invention has the characteristics of high tensile strength (68 MPa), high elongation at break (200%), high visible light transmittance (higher than 75%), favorable melting processibility, favorable heat resistance and the like. The mass percent of the polylactic acid in the composition is 95-99.8% above, and the composition is completely biodegradable. The preparation method is simple and environment-friendly, and can easily implement industrialization.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to the technical field of bio-based and biodegradable polymer materials, in particular to a high-strength and high-toughness transparent polylactic acid composition and a preparation method thereof. Background technique [0002] Polylactic acid is an environmentally friendly bio-based polymer material obtained from starch and other materials through fermentation and chemical synthesis. The production and use process is green and environmentally friendly, and will not increase the greenhouse effect. After use, it can be degraded into carbon dioxide and water under natural environment or composting conditions, and will not cause damage to the environment. Therefore, with the increasing shortage of petroleum resources and the aggravation of environmental pollution, it is of great strategic significance to develop polylactic acid materials to replace traditional petroleum-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04
Inventor 马丕明徐鹏武沈田丰陈明清东为富林龙
Owner JIANGNAN UNIV
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