Production process of fresh-keeping film based on titanium dioxide

Abstract

The invention relates to a production process of a fresh-keeping film based on titanium dioxide. The production process comprises preparation of a film material from raw materials including titanyl sulfate and clear lime water and preparation of a film product from the film material, wherein the clear lime water is used for neutralizing acidity of titanyl sulfate, titanyl sulfate is hydrolyzed to generate nano titanium dioxide containing metatitanic acid, nano titanium dioxide containing metatitanic acid is subjected to spray drying, nano titanium dioxide particles are obtained, ground by gas stream and organically coated with films, a preparation raw material for the fresh-keeping film is formed, the modified nano titanium dioxide particles are subjected to master batch granulation through a double-screw extruder, mother batch is melt through a single-screw extruder, and finally, film casting is performed. A finished product of the fresh-keeping film has the advantages of uniform ingredients, uniform surface structure, no pin holes, good stability and the like, and the nano fresh-keeping film has excellent fresh-keeping performance, and the fresh-keeping degree of fruits and vegetables is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of food fresh-keeping film production, and particularly relates to a production process of a titanium dioxide-based fresh-keeping film. Background technique [0002] Because the climate has the characteristics of four seasons in a year, as fruits and vegetables, they all have specific seasonality. In the peak season, the products are abundant and the price is lower; in the off-season, the supply is scarce and the price is higher, and there is an obvious seasonality and price difference. Although with the improvement of agricultural technology, there has been a great development of vegetables grown in off-season, but for the vast northern regions with long winters and low temperatures, off-season planting consumes a lot of energy and costs a lot, and for most fruits, it mainly depends on Storage regulates off-season supply. Therefore, research and development of fruit and vegetable preservation technology w...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcoming of the poor fresh-keeping effect of the fresh-keeping film in the prior art, the present invention provides a production process of a titanium dioxide-based fresh-keeping film. The fresh-keeping film produced by the production process has a long fresh-keeping time, stable effect, smooth surface and high tensile strength. good, unbreakable