Thermal-insulation and degradable mulching film composition and preparation method thereof

Abstract

Thermal-insulation and degradable mulching film composition is prepared from components in parts by mass as follows: 100 parts of PPC (polypropylene carbonate resin), 50-70 parts of PBAT (polybutyleneadipate terephthalate), 30-50 parts of toughening-modified resin, 2-5 parts of a temperature keeping and increasing additive and 0.1-1.0 part of a nucleating agent. A mulching film melt prepared fromthe mulching film composition is high in strength, excellent in mechanical property, good in temperature keeping and increasing performance and suitable for areas with large day and night temperaturedifference.

Description

technical field [0001] The invention belongs to the technical field of ground covering films, and in particular relates to a thermal insulation and degradation film composition and a preparation method thereof. Background technique [0002] The use of agricultural ground covering film (hereinafter referred to as mulch film) in a low temperature environment can improve the survival rate of crops, and play a role in accelerating the ripening and increasing production of crops, so it is widely used; the prior art usually uses polymer Ethylene blow molding is used to prepare mulch, and polyethylene raw materials are derived from non-renewable resources such as the petrochemical industry. With the increasing shortage of petrochemical resources, the long-term supply of mulch raw materials has brought crisis, and the cost is also increasing; moreover, polyethylene mulch It is non-degradable or takes a long time to degrade slowly after use, and usually it will bring white pollutio...

AI Technical Summary

Problems solved by technology

However, due to the stages of development, the existing biodegradable polymer materials have certain deficiencies. For example, polypropylene carbonate resin is relatively cheap, but its melt strength is low, which makes it difficult to blow the film, and the film prepared by biaxial stretching High brittleness and low tear strength; other films such as polyhydroxyalkanoate (PHA, PHB, PHBV), aliphatic polycarbonate (APC), polyvinyl alcohol (PVA), etc. have poor mechanical properties, etc. problems, and the traditional biodegradable film mulch has the following problems: due to the heating effect of sunlight during the day, the temperature in the area covered by the mulch film can maintain a high temperature, which is conducive to the growth of crops, but at night or when there is no sunlight, the temperature difference between day and night In large cases, the temperature of the film-covered area will drop a lot due to the loss of heat, which is not conducive to the growth of crops; therefore, it is necessary to develop a thermal insulation film that can effectively avoid lowering the temperature, which is conducive to the large-scale promotion and use of biodegradable plastics