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Architecture / ceramics

Product introduction

I、 Product name

Carboxymethyl cellulose, carboxymethyl starch (CMC, CMS)

Ⅱ、 character

Appearance, dissolution and solubility

This product is white or yellowish flocculent powder. It is nontoxic, odorless, tasteless,

soluble in water, and soluble in glycerine when a small amount of water exists. It has good

compatibility and synergistic effect with other water-soluble adhesives, softeners and resins

★ Hygroscopicity

The equilibrium water content of CMC increases with the increase of D S value and

air humidity, and decreases with the increase of temperature. When the room temperature

and equilibrium humidity are 80%-85%, the equilibrium water content is more than 26%

★ Filmo genicity

CMC films with high viscosity and high

molecular weight have high strength an

d

flexibility. Some water-soluble resins are

used as crosslinking agents, and the mixed

solution of CMC is used to cast the film

After further drying and plasticizing treatment

the film can become an insoluble product

Water insolubility can also be obtained b

treating the dried CMC with aluminum salt

Viscosity and rheology

At the same D S value, the viscosity

increases with the increase of concentration

decreases with the increase of temperature,

and rises after cooling. When the ph value of

1% CMC aqueous solution is 6.0-9.0, the viscosity is the highest, and when the pH value is<6or>11.5

the viscosity begins to decrease The viscosity of CMC solution decreased with the increase of shear

rate due to its excellent pseudoplasticity