Method for preparing fully-biodegradable agricultural film

Abstract

The invention relates to a method for preparing a fully-biodegradable agricultural film, and the method comprises the following specific steps of: firstly, adding polylactic acid and additive into a reaction tank, and mixing and modifying the polylactic acid and the additive, wherein the additive comprises the ingredients of glycerol (glycerin), poly(lactic acid-glycolic acid) and liquorice; then, uniformly stirring the modified polylactic acid and packing, preparing the mixture into fully-biodegradable polylactic acid polymer particles by virtue of a granulator; and finally, casting the polylactic acid polymer particles into a film by virtue of a film casting machine, and cutting the film by virtue of a slitting machine according to specification requirements, so as to obtain the agricultural film of the required specificatio. The agricultural film has the effects of being lower in production cost, completely substituting for the existing plastic films and realizing a full biodegradation effect within specific time according to the requirements.

Description

technical field [0001] The invention relates to a preparation method of a film product, in particular to a preparation method of a completely biodegradable agricultural film. Background technique [0002] As we all know, polylactic acid (PLA) is a world-recognized biodegradable material, but it has not been widely used because of its high cost, low softening point, poor ductility, brittleness and obvious linearity. To the field of agricultural film or other film products. [0003] Due to the above-mentioned shortcomings of polylactic acid, various polylactic acid products (injection molding and sheet materials) on the market currently use polycaprolactone (PCL) to modify polylactic acid to improve its fragility and other shortcomings, making it The performance of the finished product can meet the user's requirements, but the complete degradability and timeliness of the modified polylactic acid prepared by this method are obviously insufficient, and the production cost of th...

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Problems solved by technology

[0002] As we all know, polylactic acid (PLA) is a world-recognized biodegradable material, but it has not been widely used because of its high cost, low softening point, poor ductility, brittleness and obvious linearity. To the field of agricultural film or other film products

[0003] Due to the above-mentioned shortcomings of polylactic acid, various polylactic acid products (injection molding and sheet materials) on the market currently use polycaprolactone (PCL) to modify polylactic acid to improve its fragility and other shortcomings, making it The performance of the finished product can meet the user's requirements, but the complete degradability and timeliness of the modified polylactic acid prepared by this method are obviously insufficient, and the production cost of the finished product is high, so it is widely used in the market. The price is high and cannot meet the needs of mass production

However, in order to make the price of polylactic acid agricultural film close to the acceptable level of the market and achieve the effect of completely replacing ordinary plastic agricultural film, it is necessary to increase the fillers such as starch and inorganic substances to reduce the production cost, but due to polylactic acid It has brittle and obvious linear characteristics, and it is difficult to polymerize between the above-mentioned filler and the modified polylactic acid due to the lack of a cross-linking agent

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