All-biodegradable modified polylactic acid film-blowing resin and preparation method thereof

Abstract

The invention provides an all-biodegradable modified polylactic acid film-blowing resin and a preparation method thereof. The modified polylactic acid film-blowing resin comprises 20-60% of polylactic acid, 20-45% of polyadipic acid / butylene terephthalate, 12-20% of polypropylene carbonate resin, 3-5% of talcum powder, 1-2% of ethylene-acrylic acid copolymer, 1.5-3% of chain extender, 0.5-1% of erucyl amide, 0.5-1% of zinc stearate, 0.5-1% of melt strength enhancer, 0.5-1% of hydrolysis-resistant stabilizer and 0.5-1% of PE (polyethylene) wax. The film product prepared from the resin is stable at normal temperature, and has the biodegradability of at least 92% within 90 days under the condition of forced composting, thereby completely satisfying the requirements in relevant standards, The physical properties are greatly maintained, and the cost is lower than that of like products. The resin can be widely used in the fields of film packaging, agricultural mulching films, refuse classification landfilling and composting, and the like.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a completely biodegradable modified polylactic acid blown film grade resin and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, the requirements for the environment are getting higher and higher. At the same time, countries are paying more and more attention to the protection of the environment. Plastic is a very common material in daily life and industrial production. The degradation rate is very slow, even non-degradable, resulting in white pollution. In this regard, there are more and more researches and developments on biodegradable resins. At present, there are also many degradable materials produced and used in some daily life Among them, such as garbage bags, shopping bags, etc., are generally degradable materials (such as photodegradation, oxidative degradation, etc.), although they bring the excellent pe...

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Problems solved by technology

[0002] With the improvement of people's living standards, the requirements for the environment are getting higher and higher. At the same time, countries are paying more and more attention to the protection of the environment. Plastic is a very common material in daily life and industrial production. The degradation rate is very slow, even non-degradable, resulting in white pollution. In this regard, there are more and more researches and developments on biodegradable resins. At present, there are also many degradable materials produced and used in some daily life Among them, such as garbage bags, shopping bags, etc., are generally degradable materials (such as photodegradation, oxidative degradation, etc.), although they bring the excellent performance of degradability, but at the same time sacrifice many physical properties, the cost is also high. Relatively high, and cannot reduce the use of ordinary plastics. Traditional ordinary plastic products cannot be decomposed by microorganisms after being discarded, so it is not an effective solution to "white waste"

Existing degradable plastics have greatly reduced their physical properties, such as the material's tensile force is greatly reduced, resulting in a material of the same thickness, the load-bearing capacity of the degradable material is reduced, and the ductility is reduced, which cannot be composted and degraded, and leads to Due to defects such as shortened service life, some manufacturers do not hesitate to add some high-cost components in order to achieve the performance of biodegradable materials, resulting in a significant increase in the cost of the product, which limits the wider application of biodegradable materials

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