Master batch for degradable mulching films and preparation method of master batch

Abstract

The invention provides master batch for degradable mulching films and a preparation method of the master batch. The master batch comprises ethylene-vinyl acetate copolymer, polycarbonate, polyvinyl alcohol, polylactic acid, sodium alginate, soybean oil, cellulose, plant starch, titanium dioxide, dispersant, compatibilizer, plasticizer and pigment. The preparation method includes: mixing the ethylene-vinyl acetate copolymer, the polycarbonate, the polyvinyl alcohol and the compatibilizer, heating, performing high-speed dispersion, adding the sodium alginate, the soybean oil, the cellulose, the plant starch, the titanium dioxide, the dispersant, the plasticizer and the pigment, placing into an extruder for extrusion, and performing granulation to obtain the master batch. The master batch has the advantages that the master batch is good in mechanical performance and water resistance, and the mulching films produced by the master batch starts degrading in 20 days and can reach degrading level 3 in 60-70 days.

Description

technical field [0001] The invention belongs to the technical field of color masterbatches, and in particular relates to a color masterbatch for degradable plastic film and a preparation method thereof. Background technique [0002] In the arid regions of northern my country, water shortage is a key problem restricting agricultural production, and water shortage has become one of the main factors restricting the increase of crop yield. Due to the uneven distribution of annual precipitation resources, the dislocation between water demand and natural precipitation supply during the growth period of crops is caused. In addition, the soil temperature in early spring is low, so that spring-sown crops cannot emerge normally and the growth period is delayed. Farmland mulching has the functions of improving soil structure, storing water and moisture, regulating soil temperature, suppressing weeds, and increasing yield. It is an important technical measure to solve the above problems...

AI Technical Summary

Problems solved by technology

my country has successfully developed an oxidative-biodegradable film, which can combine oxidative degradation and biodegradation technologies, and at the same time overcome the defects of photocatalytic degradation technology that is not easy to degrade when there is no light or insufficient light, and degrades too quickly when there is sufficient light.

However, due to the difficulty in the research and development of oxidative-biodegradable mulch films, different regions and crops have different requirements for mulch films, and the production costs and farmers' use costs are relatively high, which limits their popularization and application.

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