Cellulose triacetate membrane

Abstract

The invention discloses a cellulose triacetate membrane which is prepared from a solution containing cellulose triacetate, a solvent and a plasticizer by using a solution curtain-casting method. The cellulose triacetate membrane is characterized in that the dosage of the plasticizer is 3-15% of weight of the cellulose triacetate; the plasticizer is prepared from a triphenyl phosphate primary plasticizer and an aryl diphosphate coplasticizer; the weight ratio of aryl diphosphate to triphenyl phosphate is 1 / 6 to 4 / 5. By adopting the cellulose triacetate membrane, precipitation of the plasticizer caused by fluctuation of a production process condition in a membrane production process is solved; apparent defects of the membrane caused by precipitation of the plasticizer are avoided; the apparent mass, the optical property and the physical and mechanical properties of the membrane are ensured; meanwhile, the cellulose triacetate membrane accords with the environment-friendly emission requirements.

Description

technical field [0001] The invention relates to a cellulose triacetate film. Background technique [0002] Cellulose acetate with an average degree of esterification of 57.5~62.5% is generally called triacetate cellulose, and the triacetate cellulose film (TAC film) made of it is suitable for polarizing because of its excellent optical isotropy. In-chip protective film or color filter for liquid crystal display, anti-glare film, anti-reflection film, phase difference film and other functional film layers, and its market is expanding rapidly. [0003] TAC film is generally prepared by solution casting method, that is, cellulose triacetate, plasticizer, various additives, etc. are dissolved in a solvent to form a viscous high-concentration cotton glue solution, and then the high-concentration cotton glue solution is cast on On the strip or drum-shaped endless support, a film is formed through a series of processes such as drying and winding. Compared with other methods such ...

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Problems solved by technology

[0006] In order to replace phthalate plasticizers, relevant literature discloses that triphenyl phosphate esters and biphenyl diphenyl phosphate can be used in combination to improve the physical and mechanical properties of the film. However, in the production process of the film Due to fluctuations in production process conditions, plasticizers are precipitated, which in turn affects the appearance of the film and causes quality problems

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