Degradable film and preparation method thereof

Abstract

The invention relates to a degradable film and a preparation method thereof. The method comprises the following steps: 1) drying PBT/adipate terephthalate, thermoplastic starch, PHA resin and a filling material; 2) weighing PBT/adipate terephthalate, the thermoplastic starch, the PHA resin, a compatibilizer, an and the filling material in proportion, uniformly mixing the components in a high mixing machine for 3-10 minutes; 3) adding a mixture in a double screw extruder for melt blending, bracing the mixture, and pelletizing the mixture to obtain blending particles, wherein the extrusion temperature is 100-170 DEG C; and 4) extruding the blending particles in the step 3) and a lubricant through a single screw extruder, then performing blow molding by a film blowing machine to obtain the degradable film. Compared with the prior art, the prepared degradable film is adapted to different climate condition at different places, is degraded after a certain time, cannot generate secondary pollution, and has important practical meaning for environment treatment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a degradable composite film and a preparation method thereof. Background technique [0002] Petrochemical plastic products have already penetrated into various fields of human life. While bringing convenience to people, they inevitably bring about problems such as energy consumption and environmental pollution. At present, the "white pollution" caused by the extensive use of plastic products has brought serious harm to the ecological environment, such as the reduction of production in many fertile fields, land desertification, and river blockage. As an environmentally friendly material, degradable plastics have become the focus of research and development in the world today, and their development has alleviated environmental conflicts and resource constraints to a certain extent. Application prospect. [0003] Polybutylene terephthalate / adipate (PBAT) is a ternary copol...

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Problems solved by technology

[0005] Chinese patent 200910109765.8 discloses an antistatic degradable film material and its preparation method. The film is prepared by using low-density polyethylene, linear low-density polyethylene, starch-based degradable plastic raw materials and antistatic masterbatch, and the finished product has good antistatic effect , with excellent mechanical properties, but this film material is only partially degraded, which still has a certain impact on the environment

Chinese patent 201019050017.7 introduces a method for preparing a biodegradable film that prevents damage to the soil structure. Starch, polyvinyl alcohol, PHB and other auxiliary materials are extruded and granulated and then blown into a film. The process is simple and easy to operate, but each material The compatibility between them needs to be further improved, which will affect the mechanical properties of thin film materials and limit their application fields.

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