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CMC Easy To Disperse
Sep 28, 2017

CMC Easy to disperse

Sodium carboxymethyl cellulose, sodium salt of cellulose carboxymethyl ether, is anionic cellulose ether, white or milky white fibrous powder or particles, the density of 0.5-0.7 g / cubic centimeter, almost odorless, tasteless, With hygroscopicity. Easy to disperse in water into a transparent gelatinous solution, insoluble in organic solvents such as ethanol. 1% aqueous solution pH 6.5 ~ 8.5, when pH> 10 or <5, the viscosity of the mortar is significantly reduced, the best performance at pH = 7. The heat stability at 20 ℃ below the rapid increase in viscosity, 45 ℃ change slowly, more than 80 ℃ for a long time heating can make its colloid denaturation and viscosity and performance decreased significantly. Soluble in water, the solution is transparent; in alkaline solution is very stable, case of acid is easy to hydrolysis, pH value of 2-3 will appear precipitation, the case of polyvalent metal salt will react to precipitate.

Understand some of the properties of carboxymethyl cellulose sodium, after the characteristics of the following to introduce its use:

CMC will be directly mixed with water, prepared into a paste glue, spare. When the CMC paste is configured, add a certain amount of clean water to the mixing tank with the stirring device. In the case of opening the stirring device, the CMC is slowly and evenly distributed into the mixing tank, And water fully integrated, CMC can be fully dissolved. In the melting CMC, the reason to be evenly dispersed, and constantly stirring, the purpose is to "in order to prevent the CMC and water meet, the agglomeration, agglomeration, reduce the amount of CMC dissolved", and improve the dissolution rate of CMC. The time of mixing and the time of complete melting of the CMC is not consistent. It is two concepts. In general, the mixing time is much shorter than the time required for the CMC to completely dissolve, depending on the circumstances.

Determine the mixing time is based on: when the CMC in the water evenly dispersed, there is no obvious large lumps of objects exist, you can stop stirring, so that CMC and water in the static state of mutual penetration, mutual integration.

The basis for determining the time required for complete melting of the CMC is as follows:

(1) CMC and water are completely bonded, there is no solid-liquid separation between the two; (2) mixed paste was uniform state, the surface smooth and smooth; (3) mixed paste color close to colorless and transparent, There are no granular objects in the paste. From the CMC is put into the mixing tank with water to start mixing, to the CMC completely dissolved, the required time between 10 to 20 hours.

In the preparation of the knot, agglomeration problem is that we need to pay attention, then we need to master some of the mixing technology, there is to determine the mixing time, completely melted when some of the phenomenon.