How to identify the carboxymethyl cellulose sodium CMC and its advantages and disadvantages?


CMC is an anionic polymer compound with a molecular of 6400 (C 1 000) produce with caustic. The main byproducts are sodium chloride and sodium glycolate. The CMC belongs to the natural cellulose modification. The Food and Agriculture Organization of the United Nations (FAO).


The main measures of CMC quality are substitution degree (DS) and purity. Generally, the properties of CMC are different in DS. Increasing the enhanced solubility and the better the transparency and stability of the solution. The CMC substitution was reporte to have better transparency at 0.7 to 1.2. And its aqueous solution viscosity was maximum at pH from 6 to 9. In order to ensure its quality, in addition to selecting etherizer, some factors must affect the substitution degree and purity. Such as the dosage relationship between alkali and etherizer, etherification time, system water content, temperature, etc.

Analysis of the advantages of carboxymethylcellulose:

The development of sodium carboxymethyl cellulose is indeed unprecedented, especially in recent years, the expansion of the application field and the reduction of the production cost make the manufacturing of carboxymethyl cellulose more and more popular, and this phenomenon will inevitably lead to the mix of products sold on the market Then, how to determine the quality of sodium carboxymethylcellulose, we will analyze from some physical and chemical perspectives:

First of all, it can be distinguishe from the temperature of its carbonization, the general sodium carboxymethyl cellulose carbonization temperature is 280-300℃, when this temperature is not reache, then this product has a problem. (Mafer furnace for general carbonization) Secondly, by its discoloration temperature to distinguish, generally sodium carboxymethyl cellulose to a certain temperature will change color, this temperature range is 190-200℃. Thirdly, it can be identified from its appearance, the vast majority of products are white powder in appearance, its granularity is generally 100 items can pass the probability is 98.5%. Carboxylmethyl cellulose sodium is a very widely used type of cellulose products, wide application industry, so there may be some imitation on the market, so how to identify whether it is the user needs of the product, can be through the following identification test.


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