Properties and Applications of CMC

CMC is the sodium salt of cellulose carboxymethyl ether, an anionic cellulose ether. CMC is white or milky white fibrous powder or granules with a density of 0.5-0.7 g/cm3, almost odorless, tasteless, and hygroscopic. It is easy to disperse into a transparent gel solution in water, but insoluble in organic solvents such as ethanol.

Viscosity is an important factor for judging the quality and performance of CMC. It has a wide range of uses, involving the food industry, daily chemical industry, etc., which is also closely related to its viscosity, so what are the requirements for viscosity? different industries? The upper limit of CMC used in building decoration and other industries may also have a higher viscosity from 200 to 1200, and the viscosity of washing grade CMC is 10 to 70 (below 100). The viscosity chosen for various industries will vary depending on the application.

Viscosity is often one of the key indicators of CMC-Na, viscosity figures and liquid concentration, temperature, shear efficiency, etc. Although CMC is widely used, attention should be paid to its scope of use and precautions in actual use. It should be noted that CMC-Na containing strong acid, strong alkali, and heavy metal ions is prohibited. Please read the manual carefully or consult the manufacturer before use.

Properties

1. It is thermally stable. The viscosity rises rapidly below 20°C and changes slowly at 45°C. Long-term heating above 80°C will denature the colloid, and the viscosity and performance will decrease significantly.

2. Easily soluble in water, the solution is transparent. It is stable in alkaline solution, but easily hydrolyzed in the presence of an acid, precipitates when the pH value is 2-3, and also reacts and precipitates in the presence of polyvalent metal salts.

Application

In the building materials industry, CMC is used as a retarder, insurance agent, thickener, and adhesive. After adding CMC, the coating has good flexibility, air tightness, and water resistance. It is used as an adhesive and anti-settling agent in the daily chemical industry.

Adding CMC to concrete can increase the water retention, cohesion, and uniformity of concrete, play a role in retarding settings, and increase durability strength. Wall putty powder CMC. Used to make barricades. Mortar plasticizers for masonry materials and wall treatment, especially the workability, crack resistance, and durability of mortar are greatly improved.

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