Composite film and preparation method and applications thereof

Abstract

The invention discloses a composite film, and a preparation method and applications thereof. The preparation method comprises the following steps: mixing vinyl-terminated fluorosilicone oil with hydrogen-containing silicone oil, chloroplatinic acid, a reaction solvent and a reaction inhibitor, stirring at 30-45 DEG C, and stopping stirring when the viscosity reaches 40-80 mPa*s so as to obtain a fluorine-modified silicone rubber solution; mixing cellulose acetate, dimethylacetamide, ethylenediamine propyl methyl dimethoxy silane and polyethylene glycol 400, stirring at 55-70 DEG C for 18-36 hours, coating the surface of non-woven fabric with an obtained mixture by blade coating, and carrying out phase inversion in water bath to obtain a base film; and uniformly coating the surface of the base film with the fluorine-modified silicone rubber solution, and crosslinking at 80-100 DEG C for 3-5 hours to obtain the composite film. The composite film is excellent in anti-pollution performance, and solvent resistance; the binding strength of the base film layer with an active film layer is high, the service life in yellow rice wine is long, separation of alcohol and aroma components in yellow rice wine can be realized effectively, clarified and transparent high alcohol concentration yellow rice wine can be prepared, and the turbidity of the yellow rice wine before penetrating through the composite film is high, and the composite film can be used for wine mixing or beverage mixing or further fermentation preparation of rice vinegar and other products.

Description

technical field [0001] The invention belongs to the technical field of pervaporation membrane materials, and in particular relates to a composite membrane for separation and its preparation method and application. Background technique [0002] Rice wine originated in China and is one of the oldest traditional brewed wines in the world. It is also known as the world's three major fermented wines along with beer and wine. Rice wine is made from rice, millet, black rice, corn, wheat, etc., steamed, mixed with wheat koji, rice koji or wine medicine, saccharified and fermented. my country's rice wine production is mainly concentrated in Zhejiang, Jiangsu, Shanghai, Fujian, Jiangxi, Guangdong, Anhui and other places. Compared with white wine, rice wine is healthier, less alcoholic, and has health care effects. [0003] At present, the quality of rice wine on the market is uneven, and the quality has the following deficiencies: the color of rice wine is unstable, the taste of rice...

AI Technical Summary

Problems solved by technology

[0003] At present, the quality of rice wine on the market is uneven, and the quality has the following deficiencies: the color of rice wine is unstable, the taste of rice wine is heavy, and the content of higher alcohols in rice wine is too high, which affects the recognition and acceptance of consumers.

There have been related reports on the application of pervaporation membranes in liquor. Liquor has relatively few pollutants, high clarity, and relatively easy treatment. However, for yellow rice wine, rice wine is a low-temperature pressing process with complex components and many pollutants. The pervaporation membrane is very easy to clog the membrane, causing membrane fouling, and the separation effect is not ideal