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Biodegradable composite film material of controllable degradation rate and preparation method thereof

A technology of biodegradation and degradation rate, which is applied in the field of biodegradable composite film materials and its preparation, can solve the problems of physical and mechanical properties such as the decrease of tensile strength, environmental pollution of polymer fragments, and non-biodegradability, etc., to achieve controllable Degradability, high tear strength, good mechanical properties

Active Publication Date: 2013-05-08
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, researchers have attempted to develop environmentally friendly film materials on the basis of traditional plastics. For example, CN1931905A discloses a film material made by directly blending starch, polyethylene and additives, but the film's The tensile strength is low, and while starch can improve the degradability of plastics, on the one hand, it will cause a decrease in its physical and mechanical properties such as tensile strength, making it difficult to process. On the other hand, it is also too hydrophilic, which is different from large The compatibility between some general-purpose resins is very poor, resulting in a significant drop in the mechanical properties of the material
In addition, although the content of plastic starch in this material can be high, because the matrix itself such as PE is not biodegradable
Although plastics produced by these techniques are more prone to collapse due to the degradation of starch, undegraded polymer fragments still cause environmental pollution

Method used

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  • Biodegradable composite film material of controllable degradation rate and preparation method thereof
  • Biodegradable composite film material of controllable degradation rate and preparation method thereof
  • Biodegradable composite film material of controllable degradation rate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: take each component by following formula and parts by weight

[0036]

[0037] The preparation method and conditions are set as:

[0038] (1) Dry the matrix resin and modifier in an oven at 40-80°C for 6-10 hours, then weigh the raw materials of each component according to the proportion, and pre-mix manually, and put the pre-mixture on the twin-screw extruder Extrusion granulation. The temperature setting of the twin-screw extruder is: zone one, 110-145°C; zone two, 120-160°C; zone three, 145-185°C; zone four, 145-185°C; zone five, 145-185°C ; Machine head, 145-160°C.

[0039](2) The above-mentioned composite polymer pellets are extruded and blown into a film by single-screw, and the temperature of the single-screw extruder is set as: the first zone, 110-130°C; the second zone, 130-150°C; the third zone, 140-170°C; zone four, 140-185°C; zone five, 140-185°C; zone six, 140-160°C; die temperature, 145-160°C. Among them, the screw speed is 30-60rpm, t...

Embodiment 2

[0043] Embodiment 2: take each component by following formula and parts by weight

[0044]

[0045] Processing conditions and parameters see embodiment 1;

[0046] The properties of the products obtained are shown in Table 2.

[0047] Table 2: Film Thickness 19μm

[0048]

Embodiment 3

[0049] Embodiment 3: take each component by following formula and parts by weight

[0050]

[0051]

[0052] Processing conditions and parameters see embodiment 1;

[0053] The properties of the products obtained are shown in Table 3.

[0054] Table 3: Film Thickness 35μm

[0055]

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Abstract

The invention aims to provide a biodegradable composite film material of controllable degradation rate with good mechanical property, faster and more through degradation and no environmental harm, and a preparation method thereof. The material comprises the following components in parts by weight: 100 parts of matrix resin, 0-40 parts of other biodegradable polymers, 0.5-1.5 parts of heat stabilizer, 0.3-5 parts of nucleating agent, 1-5 parts of compatilizer, 2-15 parts of plasticizer and 0.3-5 parts of opener. The matrix resin is obtained by mixing poly lactic acid (PLA) and 3-hydroxybutyrate-3-hydroxy acid copolyester (PHBH) with each 20-80 parts by weight. The other biodegradable polymers are poly butylenes succinate (PBS), poly propylene carbonate (PPC), 3-hydroxybutyrate-3-hydroxyvalerate copolyester (PHBV) and terephthalic acid-butanediol-adipic acid copolyester (PBAT).

Description

technical field [0001] The invention relates to a biodegradable composite film material with controllable degradation rate and a preparation method thereof. Background technique [0002] In recent years, researchers have attempted to develop environmentally friendly film materials on the basis of traditional plastics. For example, CN1931905A discloses a film material made by directly blending starch, polyethylene and additives, but the film's The tensile strength is low, and while starch can improve the degradability of plastics, on the one hand, it will cause a decrease in its physical and mechanical properties such as tensile strength, making it difficult to process. On the other hand, it is also too hydrophilic, which is different from large The compatibility between some general-purpose resins is very poor, resulting in a significant drop in the mechanical properties of the material. In addition, although the content of plastic starch in this material can be high, the m...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L69/00C08L71/02C08L23/08C08K13/02C08K3/34C08K3/38C08K5/092C08K5/134C08K5/13C08K5/372C08K5/14C08K5/098C08K5/20B29C47/92B29C48/92
CPCB29C48/08B29C48/04
Inventor 翁云宣王垒
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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