Photodegradable and biodegradable polyethylene plastic bag

Abstract

The invention discloses a photodegradable and biodegradable polyethylene plastic bag, which is characterized by comprising the following components in parts by weight: 100 parts of LDPE (Low-Density Polyethylene), 5-10 parts of filler, 0.1-1.5 parts of compatibilizer, 0.1-1 part of photosensitizer, 1-10 parts of corn starch, 1-10 parts of microcrystalline cellulose and 2-11 parts of silane coupling agent. A preparation process comprises the following steps of: (1) crushing the corn starch, calcium carbonate powder and the microcrystalline cellulose into superfine grains; (2) drying the corn starch, adding the silane coupling agent to perform surface treatment, and adding the compatibilizer for later use; (3) adding an activating agent and a dispersing agent into the calcium carbonate powder for later use; (4) mixing the materials obtained by the steps (2) and (3), adding the LDPE, the microcrystalline cellulose and the photosensitizer, mixing with two rolls, crushing, extruding and granulating to obtain parent stock; and (5) mixing the photodegradable and biodegradable parent stock with the LDPE, drying, performing blow molding, reeling, and making bags to obtain the photodegradable and biodegradable polyethylene plastic bag. The plastic bag obtained by the invention can be broken into pieces in the time of about 15 days, can also be eroded and broken down by fungi, and achieves the photodegradation and biodegradation composite effect.

Description

technical field [0001] The invention relates to a photodegradable and biodegradable plastic, which is suitable for preparing garbage bags and belongs to the field of plastics. Background technique [0002] Garbage bags are a necessity in people's daily life, but the direct contradiction between the convenience of using garbage bags and environmental pollution is becoming more and more serious. For this reason, the country has issued a plastic restriction order, but the effect is not too obvious. In addition to reducing the use of garbage bags In addition, the material of garbage bags is also an aspect to be considered. For this reason, people have begun to focus on research on degradable plastic bags. However, although the existing plastic bags can be well degraded into fragments in an exposed environment, urban garbage tends to Compared with the landfill method, these degraded garbage fragments are buried in garbage or soil, and the degradation effect is not obvious. Cont...

AI Technical Summary

Problems solved by technology

[0002] Garbage bags are a necessity in people's daily life, but the direct contradiction between the convenience of using garbage bags and environmental pollution is becoming more and more serious. For this reason, the country has issued a plastic restriction order, but the effect is not too obvious. In addition to reducing the use of garbage bags In addition, the material of garbage bags is also an aspect to be considered. For this reason, people have begun to focus on research on degradable plastic bags. However, although the existing plastic bags can be well degraded into fragments in an exposed environment, urban garbage tends to Compared with the landfill method, these degraded garbage fragments are buried in garbage or soil, and the degradation effect is not obvious

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