Transparent, tear-resistant and biodegradable polylactic acid thin film and preparation method thereof

A biodegradable, polylactic acid technology, applied in the field of transparent tear-resistant polylactic acid biodegradable film and its preparation, can solve the problems of non-tear-resistant flexibility, serious brittleness of polylactic acid film, etc., so as to solve the defects of serious brittleness, Significant economic and social significance, effect of simple equipment

Inactive Publication Date: 2015-03-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention aims to solve the technical problems of severe brittleness, non-tear resistance and poor flexibility of polylactic acid films in the prior art, and provides a transparent tear-resistant polylactic acid biodegradable film and its preparation method

Method used

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  • Transparent, tear-resistant and biodegradable polylactic acid thin film and preparation method thereof
  • Transparent, tear-resistant and biodegradable polylactic acid thin film and preparation method thereof
  • Transparent, tear-resistant and biodegradable polylactic acid thin film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: the present invention provides a kind of transparent anti-tear polylactic acid biodegradable film, the composition of its formula and the ratio of mass parts are:

[0028]

[0029]Weigh polylactic acid, polybutyl carbonate, ethylene bis stearic acid amide, erucic acid amide according to the above formula, carry out mechanical blending of each component for 5 minutes, put the mixed raw materials into the twin-screw extruder, extrude During the extruder side line, use a peristaltic pump to quantitatively add the above-mentioned 1,2-trimethylene adipate. The conditions for extrusion and granulation are: the set temperature of the twin-screw extruder is: Zone 1: 130-150°C , Zone 2: 160-180℃, Zone 3: 160-190℃, Zone 4: 160-190℃, Zone 5: 160-190℃, Zone 6: 160-190℃, Zone 7: 160-190℃, Zone 8 Zone: 160-190°C, machine head: 160-190°C, screw speed: 100-300rpm, extrude, granulate and dry to obtain polylactic acid blown film resin. The resin is blown into a film by ...

Embodiment 2

[0030] Embodiment 2: the present invention provides a kind of transparent anti-tear polylactic acid biodegradable film, the composition of its formula and the ratio of mass parts are:

[0031]

[0032] This step of extrusion granulation and film blowing process is the same as that of Example 1, the thickness of the film is controlled at 0.04mm, and the mechanical properties and light transmittance of the film are tested. The test results are listed in Table 1.

Embodiment 3

[0033] Embodiment 3: the present invention provides a kind of transparent anti-tear polylactic acid biodegradable film, the composition of its formula and the ratio of mass parts are:

[0034]

[0035] This step of extrusion granulation and film blowing process is the same as that of Example 1, the thickness of the film is controlled at 0.04mm, and the mechanical properties and light transmittance of the film are tested. The test results are listed in Table 1.

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Abstract

The invention provides a transparent, tear-resistant and biodegradable polylactic acid thin film and a preparation method thereof, belonging to the field of high molecular material and solving the technical problem of high brittleness, poor tear resistance and poor flexibility of the polylactic acid thin film in the prior art. The transparent, tear-resistant and biodegradable polylactic acid thin film comprises a mixture of polylactic acid, a toughening agent, a plasticizer, a lubricant and a plastic lubricant. The preparation method comprises the following steps: mechanically mixing polylactic acid, the toughening agent, the plasticizer, the lubricant and the plastic lubricant to obtain a premix at first; feeding the premix from the feeding opening of a twin-screw extruder; metering the plasticizer and adding the metered plasticizer from the liquid feeding opening of the twin-screw extruder; and pelleting by melt extrusion to finally obtain the transparent, tear-resistant and biodegradable polylactic acid thin film. The elongation at break and tearing strength of the polylactic acid thin film provided by the invention are improved obviously, the transparency of polylactic acid is retained, the brittleness defect of the polylactic acid thin film is solved, the rheological behavior of the material is improved obviously, the tensile strength is 43.2MPa at most, the elongation at break is 48%, and the right angle tear strength is 127KN/m.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a transparent tear-resistant polylactic acid biodegradable film and a preparation method thereof. Background technique [0002] Unlike traditional petroleum-based plastics, polylactic acid is polymerized from lactic acid fermented from plant starch. This is a renewable resource and has biodegradable properties, which is of great significance to protecting the environment. In the situation of increasingly tense oil energy, the development and research of polylactic acid resin is particularly important. The properties of polylactic acid itself are similar to the general-purpose plastic polypropylene, such as high modulus, high tensile strength and good processability. However, the brittleness of polylactic acid is serious, and the impact strength is less than 5KJ / m 2 , seriously restricting its wide application. [0003] Polylactic acid also has good processing perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L69/00C08L67/02C08K5/20B29B9/06B29C47/92B29C55/28B29C48/92
Inventor 张会良郎贤忠潘宏伟赵岩韩常玉边俊甲韩立晶庄宇刚董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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