Completely biodegraded polylactic acid nanometer composite material and preparation method thereof

A nanocomposite material and biodegradation technology, which is applied in the field of modification and processing of biodegradable polymer materials, can solve the problems of affecting the biodegradation performance of composite materials, the decrease of toughness of composite materials, and the small increase in toughness, etc. The effect of large-scale production, high tensile strength, and excellent comprehensive performance

Inactive Publication Date: 2010-06-16
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

CN101275011 discloses a polylactic acid-based ternary composite material. When adding rubber elastomer, calcium carbonate micropowder is added to maintain high tensile strength and modulus, but the toughness of the composite material increases significantly with the increase of calcium carbonate content. Decline, compared with pure polylactic acid, its performance has not improved much
Moreover, this type of rubber elastomer has a high filling content and is not biodegradable, which seriously affects the biodegradability of its composite materials.
Yin J.B.; et al. (Polymer 2007, 48, 6439-6447) prepared a polylactic acid / poly(ε-caprolactone) / organically modified montmorillonite ternary composite, which maintained a high Rigidity, but the toughness is not much improved compared with pure polylactic acid

Method used

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  • Completely biodegraded polylactic acid nanometer composite material and preparation method thereof
  • Completely biodegraded polylactic acid nanometer composite material and preparation method thereof
  • Completely biodegraded polylactic acid nanometer composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0042] A, pre-mixing: take raw materials according to the proportioning of the mass parts of Example 1-3 in Table 1 and the technical index of explanation, put into high-speed mixer and stir evenly; The speed of described high-speed mixer is 300 rpm;

[0043] B. Mixing: Put the above-mentioned uniformly stirred materials into an ordinary internal mixer, 175°C, 60 rpm, and mix for 10 minutes;

[0044]C. Hot press molding: hot press the above-mentioned products after further mixing into sheets on a flat vulcanizing machine; the thickness of the sheets is 1.0 mm and 4 mm; the hot press molding temperature is 190 ° C, and the pressure is 10 MPa .

[0045] The prepared sheet was subjected to tensile and notched impact tests, the sample size was the same as that of Comparative Example 1, and the measured mechanical properties are shown in Table 2.

Embodiment 4-7

[0047] A, premixing: take the raw materials according to the proportioning of the mass parts of Examples 4-7 in Table 1 and the technical index of explanation, put into the high-speed mixer and stir evenly; The speed of the high-speed mixer is 500 rpm;

[0048] B. Mixing: Put the above-mentioned uniformly stirred materials into an ordinary internal mixer, 175°C, 60 rpm, and mix for 5 minutes;

[0049] C. Hot press molding: hot press the above-mentioned products after further mixing into sheets on a flat vulcanizing machine; the thickness of the sheets is 1.0 mm and 4 mm; the hot press molding temperature is 190 ° C, and the pressure is 10 MPa .

[0050] The prepared sheet was subjected to tensile and notched impact tests, the sample size was the same as that of Comparative Example 1, and the measured mechanical properties are shown in Table 2.

Embodiment 8

[0052] A, premixing: take the raw material according to the proportioning of the mass parts of Example 8 in Table 1 and the technical index of explanation, put into the high-speed mixer and stir evenly; The speed of the high-speed mixer is 200 rpm;

[0053] B. Extrusion granulation: Put the above-mentioned mixed sample into a twin-screw extruder to extrude granulation. The processing temperature conditions are: Zone 1: 70°C; Zone 2: 140°C; Zone 3: 150°C; Zone 4: 165°C; Zone 5: 175°C; Zone 6: 185°C; Zone 7: 180°C; Connector: 170°C; Head: 170°C, screw speed 15HZ;

[0054] C. Hot press molding: hot press the above-mentioned products after further mixing into sheets on a flat vulcanizing machine; the thickness of the sheets is 1.0 mm and 4 mm; the hot press molding temperature is 190 ° C, and the pressure is 10 MPa .

[0055] The prepared sheet was subjected to tensile and notched impact tests, the sample size was the same as that of Comparative Example 1, and the measured mechan...

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Abstract

The invention relates to a completely biodegraded polylactic acid nanometer composite material and a preparation method thereof. The composite material comprises the following raw materials in part by mass: 50 to 90 parts of polylactic acid, 5 to 40 parts of poly(epsilon-caprolactone), 1 to 20 parts of nanometer silicon dioxide, 1 to 5 parts of plasticizer, 0.3 to 1 part of antioxidant, 0.1 to 0.5 part of lubricant, and 0.1 to 0.5 part of heat stabilizer. The method comprises the following steps: premixing, melt blending and hot press forming in an internal mixer or double-screw extrusion comminutor. The polymer components selected in the composite material are polymers which can be completely biodegraded, and the nanometer silicon dioxide and various auxiliary agents are non toxic or pollution-free, and can meet the environment-friendly requirement; and the composite material not only shows high tenacity, but also maintains higher tensile strength and Young modulus. The maximum elongation of the material is 320 percent, and the maximum value of the tensile strength of the material is 61.3MPa, so the material is expected to be applied in the field of package materials, daily necessities and agricultural films.

Description

technical field [0001] The invention relates to a completely biodegradable polylactic acid nanocomposite material and a preparation method thereof, and belongs to the field of modification and processing of biodegradable polymer materials. Background technique [0002] In order to solve the "white pollution" problem caused by daily plastic waste and reduce the dependence on non-renewable petroleum resources, the use of biodegradable polymer materials to replace non-degradable petroleum-based plastics has become a hot spot in the research and development of polymer materials. Among many biodegradable polymer materials, polylactic acid is considered to be the one with the most development potential. It is derived from renewable plant resources, has good biodegradability and compatibility, and finally decomposes into carbon dioxide and water in the environment, without pollution to the environment; it also has tensile strength and modulus comparable to general-purpose plastics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/02C08K3/36B29C43/58
Inventor 闻新冉祥海韩常玉庄宇刚董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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