A kind of preparation method of high-strength and high-toughness heat-resistant polylactic acid base film material

A polylactic acid base film and polylactic acid technology, which is applied in the field of polymer materials, can solve the problems that the reinforcing effect of inorganic fillers cannot be fully exerted, the inorganic fillers cannot be completely compatible with polylactic acid, and the interface stress transfer efficiency is low. Achieve the effect of improving the interface stress transfer efficiency, low cost and easy industrial production

Active Publication Date: 2017-01-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above technology has improved the tensile strength of polylactic acid materials to a certain extent, but the compatibility between inorganic fillers and polylactic acid is poor, resulting in weak interaction between polylactic acid matrix and inorganic fillers, and low interfacial stress transfer efficiency, making inorganic The reinforcing effect of the filler on the matrix cannot be fully exerted, and it is easy to further embrittle the material
Although the compatibility can be improved by interfacial modification, inorganic fillers are still not fully compatible with PLA

Method used

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  • A kind of preparation method of high-strength and high-toughness heat-resistant polylactic acid base film material
  • A kind of preparation method of high-strength and high-toughness heat-resistant polylactic acid base film material
  • A kind of preparation method of high-strength and high-toughness heat-resistant polylactic acid base film material

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Experimental program
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Effect test

Embodiment 1

[0033]Weigh the dried N,N'-1,2-bis(phenyloxalamide)-ethane and polylactic acid (4032D), add it to the torque rheometer according to the mass ratio of 0.5 / 99.5, and set it at 180°C After melt blending at 50rpm for 4min, the resulting composition was hot-pressed at 230°C by a flat vulcanizer to form a 1mm-thick sheet, then kept at 150°C for 2min, and then cooled to room temperature at a rate of 50°C / min. spare. The obtained sheet was stretched three times in hot air at 75°C, cooled to room temperature, and cut into standard specimens for mechanical property testing according to relevant standards. The test results are listed in Table 1.

Embodiment 2

[0035] Weigh the dried N,N'-1,2-bis(phenyloxalamide)-ethane and polylactic acid (4032D), add it to the torque rheometer according to the mass ratio of 0.5 / 99.5, and set it at 180°C After melt blending at 50rpm for 4min, the resulting composition was hot-pressed at 230°C by a flat vulcanizer to form a 1mm-thick sheet, then kept at 150°C for 2min, and then cooled to room temperature at a rate of 50°C / min. spare. The resulting sheet was stretched 5 times in hot air at 75°C, cooled to room temperature, and cut into standard specimens for mechanical property testing according to relevant standards. The test results are listed in Table 1.

Embodiment 3

[0037] Weigh the dried N,N'-ethyl-bis-(2-aza-ethyl acetate) bisoxamide and polylactic acid (4032D), and add them to the torque rheometer at a mass ratio of 1.0 / 99.0 , after melt blending at 180°C and 50rpm for 4min, the resulting composition was hot-pressed into a 1mm-thick sheet at 220°C by a flat vulcanizer, then kept at 140°C for 3min, and then heated at 50°C / min Speed ​​down to room temperature and set aside. The resulting sheet was stretched 5 times in hot air at 75°C, cooled to room temperature, and cut into standard specimens for mechanical property testing according to relevant standards. The test results are listed in Table 1.

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Abstract

A disclosed preparation method for a high-strength high-toughness heatproof polylactic-acid-based membrane material comprises the following steps: firstly performing melt blending on polylactic acid and an amide compound, then forming a sheet material with the thickness of 0.1-3 mm, then stretching the sheet material at a temperature higher than the polylactic acid glass-transition temperature by 0-50 DEG C, and cooling to room temperature, so as to obtain the high-strength high-toughness heatproof polylactic-acid-based membrane material. The method is simple and easy for industrialization, and the obtained polylactic acid material is high in polylactic acid content, and possesses the tensile strength of 135 MPa or more, the breaking elongation of 55% and the heat-resistant temperature of 140 DEG C or more.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of polylactic acid, in particular to a preparation method of a high-strength, high-toughness heat-resistant polylactic acid base film material. Background technique [0002] Polylactic acid (PLA) can be prepared from cornstarch as a synthetic raw material. It is bio-based and does not depend on petroleum resources. After use, it can be completely decomposed into water and carbon dioxide. The degradation cycle is short, only a few months, and it has good biocompatibility Properties and transparency, easy processing, is considered to be the most promising biodegradable polymer material in this century. However, problems such as slow crystallization rate and low crystallinity of polylactic acid lead to low heat-resistant temperature and low material strength of polylactic acid. In addition, the toughness of polylactic acid is poor, and the notched imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/20B29C43/22
Inventor 马丕明许允生赵喜元沈田丰张雪纯朱俊哲郑毛荣夏军东为富陈明清
Owner JIANGNAN UNIV
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