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High-transparency toughness polylactic acid-based material and preparation method thereof

A polylactic acid-based and lactic acid-based technology is applied in the field of high-transparency and toughness polylactic acid-based materials and their preparation, which can solve the problems of poor miscibility, high flexibility and high transparency, unfavorable elastomer toughening effect, etc., and expand the application field. , Improve the effect of serious brittle defects, elongation at break and impact strength improvement

Active Publication Date: 2020-10-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor miscibility of polylactic acid and most elastomers, it is difficult to achieve a completely miscible polylactic acid blend, and the completely miscible state is not conducive to the toughening effect of elastomers
Therefore, despite extensive research, it is still difficult to obtain highly flexible and transparent PLA blend materials through compatibilization methods.

Method used

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  • High-transparency toughness polylactic acid-based material and preparation method thereof
  • High-transparency toughness polylactic acid-based material and preparation method thereof
  • High-transparency toughness polylactic acid-based material and preparation method thereof

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preparation example Construction

[0050] The present invention also provides a preparation method of polylactic acid-based material, comprising the following steps:

[0051] Pre-vacuum dry a certain proportion of polylactic acid, halogenated polyether elastomer and ionomer elastomer at 60-80°C for 12-24 hours, then add heat stabilizer and antioxidant for pre-mixing, stirring time 3-6 Minutes to prepare the premix;

[0052] The premix is ​​melt-processed with an internal mixer or extruded and granulated with a screw extruder to obtain the polylactic acid-based material.

[0053] Wherein, the weight ratio of polylactic acid, halogenated polyether elastomer and ionomer elastomer is 50-95%: 5-50%, and the amount of heat stabilizer and antioxidant is 0.05-0.2%.

[0054] Wherein, the temperature setting of the internal mixer is: 170-190° C., mixing for 5-8 minutes under the condition of rotating speed 50-100 rpm;

[0055] Preferably, the temperature of the screw extruder is set as follows: feeding section 45-100°C...

Embodiment 1

[0063] A polylactic acid-based material with high transparency and toughness and a preparation method thereof are composed of PLA / hexafluorophosphate-containing binary chlorinated polyether elastomer ionomer in a mass percentage ratio of 90 / 10, and are melt-blended.

[0064] Preparation method PLA and dibasic chlorinated polyether elastomer ionomer containing hexafluorophosphate were dried at 80°C for 24h. Put the dried PLA and the dibasic chlorinated polyether elastomer ionomer containing hexafluorophosphate in proportion into an internal mixer or a screw extruder for melt blending at 170° C. for 8 minutes, and the screw speed is 60 rpm.

[0065] Tested by the tensile instrument, the tensile strength can reach 87MPa, the elongation at break is 25%, and the impact strength is 5kJ / m 2 .

[0066] Put the PLA after banburying and the binary chlorinated polyether elastomer ionomer containing hexafluorophosphate into a vacuum laminator. The temperature of the upper and lower films...

Embodiment 2

[0069] A polylactic acid-based material with high transparency and toughness and a preparation method thereof, the composition of which is melt-blended in the mass percentage ratio of PLA / diary chlorinated polyether elastomer ionomer containing hexafluorophosphate is 95 / 05.

[0070] Preparation method PLA and dibasic chlorinated polyether elastomer ionomer containing hexafluorophosphate were dried at 80°C for 24h. Put the dried PLA and the dibasic chlorinated polyether elastomer ionomer containing hexafluorophosphate in proportion into an internal mixer or a screw extruder for melt blending at 170° C. for 8 minutes, and the screw speed is 60 rpm.

[0071] Tested by the tensile instrument, the tensile strength can reach 60MPa, the elongation at break is 260%, and the impact strength is 7.8kJ / m 2 .

[0072] Visible light transmittance can reach more than 75% by ultraviolet spectrometer test.

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Abstract

The invention discloses a high-transparency toughness polylactic acid-based material and a preparation method thereof. The polylactic acid-based material is composed of polylactic acid, a halogenatedpolyether elastomer, an ionomer elastomer synthesized from imidazole-containing monomers, a heat stabilizer and an antioxidant. The halogenated polyether elastomer adopted by the invention is obtainedby quaternization reaction of an elastomer with a polyether chain as a main chain and a halogen group in a side chain and a compound with an imidazole group in an end group, wherein the molar contentof an ionomer group of the obtained halogenated polyether elastomer is 20-30%. The polylactic acid is premixed with the obtained elastomer ionomer, a heat stabilizer and an antioxidant, and then meltprocessing is conducted by using an internal mixer or a screw extruder. According to the method disclosed by the invention, the tough polylactic acid base material with high transparency is preparedby selecting a proper elastomer to be compounded with polylactic acid, adjusting the proportion, combining a processing technology and changing the anion type in the ionomer, so that the defect of serious brittleness of polylactic acid is improved, and the application field of the material is expanded.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polylactic acid-based material with high transparency and toughness and a preparation method thereof. Background technique [0002] In recent years, under the serious situation of shortage of resources and increasing environmental pollution, bio-based polymer materials have attracted great attention. Polylactic acid (PLA) is a new generation of biodegradable bio-based polyester completely derived from renewable resources. PLA has attracted widespread attention due to its good transparency, biodegradability, biocompatibility, high mechanical strength and good processability, and is considered to be the most promising bio-based polymer in the packaging industry. potential application. In recent years, due to the development of its large-scale production, its price has been reduced day by day. As a promising and ideal substitute for petroleum-based plastics, it has attracted gre...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L71/00C08G65/333
CPCC08L67/04C08G65/33317C08L2201/10C08L71/00Y02W90/10
Inventor 张坤玉孙思婷潘莉李悦生
Owner TIANJIN UNIV
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