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Cellulose Acetate Refers To Acetic Acid As A Solvent
May 31, 2017

Acetate Optical Frames Cellulose acetate refers to a thermoplastic resin obtained by esterifying acetic acid as a solvent and acetic anhydride as an acetylating agent under the action of a catalyst. Cellulose acetate as the porous membrane material, with high selectivity, water permeability, simple processing and so on. It is the first kind of cellulose derivatives in the commercial production, and the continuous development of cellulose organic acid ester.

  preparation

  1. After the drying of pure short cotton, activated by acetic acid, and then in the presence of acetic acid catalyst, and acetic acid and acetic anhydride mixture for esterification reaction, so that the acidification, and then add dilute acetic acid hydrolysis. Neutralize the catalyst, so that the product deep precipitation, the deacidification of washing, refined, dry available.

  2. After the drying of the short cotton cashmere, activated by acetic acid, and then in the presence of sulfuric acid catalyst, and 7 times the refined short cotton acetate and acetic anhydride mixture of esterification reaction, so that the acidification, and then add dilute acetic acid Hydrolyzed to the desired degree of hydrolysis (1.72 to 1.95). Neutralize the catalyst, so that the product precipitated, the deacidification, refined, dry and then get a cellulose acetate. In the acetylation reaction, change the amount of acetic acid and acetic anhydride added to the mixture, can be made cellulose diacetate and cellulose triacetate. Acetic acid and acetic anhydride mixture of the amount of refined short lint of 8.5 times, the reaction of Picasic dilute acetic acid hydrolysis to achieve a degree of substitution of 2.28 ~ 2.49, get cellulose diacetate. Acetic acid and acetic anhydride mixture of the amount of refined short lint 10 times, the reaction of Picasic dilute acetic acid hydrolysis to achieve a degree of substitution of 2.8 to 2.9, get cellulose triacetate.

  use

  Acetate Optical Frames For the pharmaceutical products of the enteric coating, acetate fiber membrane, etc., for the production of acetic acid fiber plastic, cellulose acetate filter membrane.

  Cellulose acetate, according to the different products can be divided into diacetal spinning grade cellulose acetate, diacetium plastic grade cellulose acetate, cellulose triacetate.

  1, the second vinegar spinning grade cellulose acetate: spinning grade products is internationally recognized and has not found alternative materials, non-toxic, harmless products, it is the most important, the most important use is used as filter equipment, especially Cigarettes, the amount of filter is very large, the other is used as medical filter equipment, such as blood filter equipment; at the same time it can also be used for spinning, with silk luster, used as a senior suit clothing said.

  2, two vinegar plastic grade cellulose acetate: mainly used for the production of sheet metal, sheet, the main products are glasses frame, advanced tool handle and so on.

  3, cellulose triacetate: mainly used for electronic films, such as liquid crystal display polarizer, film, film film.

  Easy to mix material

  Acetate Optical Frames Acetate fiber (AF) and triacetate fiber (triacetate fiber, abbreviated: TAF) are often mistaken for the same fiber, in fact, although the two are similar, but their chemical composition is different. TAF is described as a general molecular structure and is the most basic acetate, which does not contain hydroxyl groups. AF is considered to be a modified or secondary acetate, and the molecular chain contains hydroxyl groups. Although there is little production of TAF, there is a higher degree of esterification than AF