Transparent biodegradable polylactic acid nano composite material and preparation thereof

A nano-composite material and biodegradation technology, applied in the field of polyester nano-composite material and its preparation, can solve the problems of opacity, reduced transparency of polylactic acid, disadvantage, etc., and achieve the effect of excellent performance

Inactive Publication Date: 2009-08-12
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

Although these composite materials have significantly improved some properties of polylactic acid, at the same time, the transparency of polylactic acid is greatly reduced, and even becomes opaque, which is unfavorable to its application to a large extent.

Method used

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  • Transparent biodegradable polylactic acid nano composite material and preparation thereof
  • Transparent biodegradable polylactic acid nano composite material and preparation thereof
  • Transparent biodegradable polylactic acid nano composite material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0040] A, premixing: take the material according to the proportioning of the weight portion of the embodiment 1-3 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 300 rpm;

[0041] B. Mixing: Put the above-mentioned uniformly stirred materials into an ordinary internal mixer, 175°C, 60 rpm, and mix for 5 minutes;

[0042] C. Hot press molding: hot press the above kneaded product at 190° C. and a pressure of 10 MPa to form a sheet with a thickness of 1.0 mm to obtain a transparent and fully biodegradable polylactic acid nanocomposite material.

[0043] Cut the sheet into dumbbell-shaped specimens, the thin neck part of which is 20 mm long and 4 mm wide, for tensile testing; cut it into square samples with a side length of 20 mm for light transmittance and haze testing. The mechanical properties and transparency measured according to the different compositions of the samples are shown in Table ...

Embodiment 4-7

[0045] A, premixing: take the material according to the proportioning of the weight portion of the embodiment 4-7 comparative example in Table 1 and the technical index of explanation, put into the high-speed mixer and stir evenly; the high-speed mixer rotating speed is 300 rev / min;

[0046] B. Mixing: Put the above-mentioned uniformly stirred materials into an ordinary internal mixer, 175°C, 60 rpm, and mix for 5 minutes;

[0047] C. Hot press forming: hot press the above kneaded product at 190° C. and a pressure of 10 MPa to form a 1.0 mm thick sheet to obtain a transparent and fully biodegradable polylactic acid nanocomposite material.

[0048] Cut the sheet into dumbbell-shaped specimens, the thin neck part of which is 20 mm long and 4 mm wide, for tensile testing; cut it into square samples with a side length of 20 mm for light transmittance and haze testing. The mechanical properties and transparency measured according to the different compositions of samples are shown i...

Embodiment 8

[0050] A, premixing: take the material according to the proportioning by weight of Example 8 in Table 1 and the technical index of explanation, put into high-speed mixer and stir evenly; The speed of high-speed mixer is 300 rev / min;

[0051] B. Mixing: Put the above-mentioned uniformly stirred materials into an ordinary internal mixer, 170°C, 60 rpm, and mix for 3 minutes;

[0052] C. Hot press molding: hot press the above kneaded product at 190° C. and a pressure of 10 MPa to form a sheet with a thickness of 1.0 mm to obtain a transparent and fully biodegradable polylactic acid nanocomposite material.

[0053] Cut the sheet into dumbbell-shaped specimens, the thin neck part of which is 20 mm long and 4 mm wide, for tensile testing; cut it into square samples with a side length of 20 mm for light transmittance and haze testing. The mechanical properties and transparency measured according to the composition of the samples are shown in Table 2, and the rheological properties ar...

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Abstract

The invention relates to transparent biodegradable polylactic acid nano composite material and a preparation method thereof. The nano composite material comprises the following components: polylactic acid, nano silicon dioxide, a plasticizer, an antioxidant and a lubricant. The preparation method comprises the following steps: premixing; milling or extruding granulation; and hot-press forming. The nano composite material is fully biodegradable; compared with pure polylactic acid, the nano composite material has obviously improved thermal stability; and the initial thermal decomposition temperature is maximally improved by 34.79 DEG C, and the highest thermal decomposition temperature is maximally improved by 31.35 DEG C. The nano composite material has good penetrability; and the visible light transmission rate of the material is between 85 and 89, and the haze value of the material is from 3.8 to 4.7. The nano composite material also has an excellent processability; the material has the following adjustable mechanical properties: a tensile strength between 32.6 and 70.4MPa, the stretch modulus between 0.80 and 2.36GPa, and breaking elongation rate between 6.2 and 280. The nano composite material is widely applied in the fields of agricultural use products, food package, daily articles, and the like.

Description

technical field [0001] The invention relates to a polyester nanocomposite material and a preparation method thereof, in particular to a transparent biodegradable polylactic acid nanocomposite material and a preparation method thereof. Background technique [0002] In order to solve the problem of environmental pollution caused by plastic waste and reduce the dependence on increasingly scarce petroleum resources, the development of environmentally friendly biodegradable polymer materials has become a research hotspot worldwide. Polylactic acid (PLA) is an aliphatic thermoplastic polyester that not only has excellent biodegradability, compostability, but also comes from renewable plant resources such as starch and sugars. It has excellent mechanical properties, processability, and transparency, so it is considered to be a good substitute for current general-purpose plastics, and can be widely used in fields such as agricultural products, food packaging, and daily necessities. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/02C08K3/36B29B7/28B29C47/92B29C51/46B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/40B29C48/9185B29C2948/92561B29C2948/9259B29C2948/92885B29C2948/92895
Inventor 闻新韩常玉庄宇刚董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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