Heat-aging-resistant polylactic acid composite material and preparation method thereof

Abstract

The invention discloses a heat-aging-resistant polylactic acid composite material and a preparation method thereof, and relates to the technical field of biodegradable plastics, and the heat-aging-resistant polylactic acid composite material is prepared from the following components in percentage by weight: 20-80% of polylactic acid, 10-50% of poly (butylene adipate-co-terephthalate), 5-10% of a compatilizer, 1-5% of an antioxidant and 1-5% of a lubricant. The adhesive comprises the following components in percentage by weight: 5-20% of diethyl tartrate modified terpene resin grafted modified monomethoxy polyethylene glycol-polylactic acid double-block copolymer, 0.2-5% of plasticizer and 0.2-5% of lubricant. The polylactic acid material can be used in food fields of meal boxes, water cups and the like, has certain light aging resistance, can be applied to the fields of mulching films, food packaging films and the like, and expands the application field of the polylactic acid material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a heat-resistant aging polylactic acid composite material. Background technique [0002] Traditional plastic packaging materials and plastic water cups and lunch boxes are usually made of polypropylene and polycarbonate, but they are difficult to recycle after use, causing serious environmental pollution problems. With the enhancement of people's awareness of environmental protection, Environmentally friendly polymer materials have received extensive attention. As a renewable resource, polylactic acid not only has good biodegradability, but also has good mechanical strength and processing properties. Therefore, polylactic acid has broad application prospects in the field of plastic applications. [0003] However, due to the low glass transition temperature of polylactic acid, there is a problem of poor long-term heat resistance, which cannot meet the long-t...

AI Technical Summary

Problems solved by technology

[0003] However, due to the low glass transition temperature of polylactic acid, there is a problem of poor long-term heat resistance, which cannot meet the long-term use requirements in hot environments, which greatly limits its application range to a certain extent.

Chinese patent CN201610711838.0 preparation method of heat-resistant and durable polylactic acid composite material and heat-resistant and durable polylactic acid composite material discloses that the performance of polylactic acid is improved by adding modified sisal fiber and shell powder, However, the improvement of its thermal aging resistance is not obvious; Chinese patent CN201510253197.4, a PLA resin toughening modified material and its preparation method, discloses a method of improving the thermal aging resistance of polylactic acid resin by adding a thermal aging agent, but The large amount of additives added has affected the degradable performance of polylactic acid resin; Chinese patent CN201610767037.6, a PLA resin modified material and its preparation method, discloses a method of adding microcrystalline cellulose, heat-resistant aging The agent solves the problem of poor heat resistance and brittleness of polylactic acid, but the improvement of heat aging resistance of polylactic acid is not obvious

[0004] Through the disclosure of the above Chinese patents, it is found that most of the methods for improving the heat aging resistance of polylactic acid are achieved by adding heat aging agents traditionally, resulting in a decrease in the degradable properties of polylactic acid, and the improvement of heat aging resistance is not obvious