Biodegradable thin film and preparation method thereof

Abstract

The invention relates to a biodegradable thin film and a preparation method thereof. The biodegradable thin film consists of the following components by weight percent: 40-60% of starch, 10-20% of dioctyl phthalate, 10-15% of sodium thiocarbamape, 8-15% of polyethylene, 1-5% of stearic acid, 1-5% of acetone and 1-5% of polyhydroxybutyrate. The preparation method comprises the following steps of: (1) adding the components into a mixer, and uniformly stirring; (2) adding the materials into a pelleting machine, and mixing, melting, extruding, cooling and slicing to obtain biodegradable resin particles; and (3) adding the biodegradable resin particles into a film blowing machine, to prepare the biodegradable thin film. The thin film disclosed by the invention not only can meet the production demand but also can perform self-degradation.

Description

technical field [0001] The invention relates to a biodegradable film and a preparation method thereof. Background technique [0002] As we all know, the invention of plastic is a great masterpiece of mankind in the 20th century. After the invention of plastic bags, people did find it very convenient, but it also brought long-term harm, causing serious pollution and harm to the environment on which human beings depend. . With the development of the economy and the improvement of people's living standards, plastic waste has increased unjustly. These wastes are disposable products made of polyolefin petroleum synthetic resin materials, which cannot be decomposed in a short time. For example, as a means of agricultural production, agricultural film is widely used in modern agriculture, but if the waste agricultural film is not cleaned up, it will bring great disadvantages to the environment and agricultural production. Long-term use of the agricultural film left on the land w...

AI Technical Summary

Problems solved by technology

For example, agricultural film, as a means of agricultural production, is widely used in modern agriculture, but if the waste agricultural film is not cleaned up, it will bring great disadvantages to the environment and agricultural production

Long-term use of the agricultural film left on the land will cause crop yield reduction, land desertification, river blockage, and cause livestock to eat and die, which seriously damages the environment

If the residual plastic film per mu exceeds 22kg, the yield of crops will decrease by 25%. If the low residual plastic film per mu exceeds 50kg, the land will not be cultivated and will lead to desertification

[0003] At present, for the degradation of films, the methods of photodegradation, oxidative degradation, and biodegradation are adopted. However, the mulch film needs to meet the requirements of different heat preservation and moisture preservation periods of different crops in various climates and soil environments. It can be degraded on time and can neither be advanced nor delayed. Therefore, the degradable mulch must be designed according to the requirements of different climates, soil environments and different crop heat preservation and moisture retention periods in various places. This has extremely high requirements for mulch manufacturers.

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