Carboxymethyl cellulose (CMC) is a non-toxic and odorless white flocculent powder with stable performance and is easily soluble in water. Its aqueous solution is a neutral or alkaline transparent viscous liquid, soluble in other water-soluble adhesives and resins, and insoluble in organic solvents such as ethanol. CMC can be used as adhesive, thickener, suspending agent, emulsifier, dispersant, stabilizer, sizing agent, etc.
Carboxymethyl cellulose (CMC) is the largest, most widely used and most convenient product among cellulose ethers, commonly known as "industrial monosodium glutamate".
1. Used for oil and gas drilling, well digging and other projects
① The mud containing CMC can make the well wall form thin and hard filter cake with low permeability and reduce water loss.
② After adding CMC into the mud, the drilling rig can obtain low initial shear force, which makes the mud easy to release the gas wrapped in it, and at the same time, it can quickly discard the debris in the mud pit.
③ Like other suspended dispersions, drilling mud has a certain existence period, which can be stabilized and extended by adding CMC.
④ The mud containing CMC is rarely affected by mold, so it is not necessary to maintain a high pH value and use preservatives.
⑤ CMC is used as the treatment agent for drilling mud flushing fluid, which can resist the pollution of various soluble salts.
⑥ The slurry containing CMC has good stability and can reduce water loss even if the temperature is above 150 ℃.
CMC with high viscosity and high degree of substitution is suitable for mud with low density, while CMC with low viscosity and high degree of substitution is suitable for mud with high density. CMC shall be selected according to different conditions such as mud type, area and well depth.
2. Used in textile, printing and dyeing industries. CMC is used as sizing agent in the textile industry for sizing light yarns of cotton, silk and wool, chemical fibers, blends and other strong fabrics;
3. CMC used in paper industry can be used as paper smoothing agent and sizing agent in paper industry. Adding 0.1%~0.3% CMC to the pulp can increase the paper's tensile strength by 40%~50%, the compressive fracture by 50%, and the kneading by 4~5 times.
4. CMC added to synthetic detergent can be used as dirt adsorbent; The glycerin aqueous solution of daily chemicals such as CMC in toothpaste industry is used as the gum base of toothpaste; Used as thickener and emulsifier in pharmaceutical industry; CMC aqueous solution is used for flotation after thickening.
5. It is used in the ceramic industry as an adhesive, plasticizer, suspension agent of glaze agent, color fixing agent, etc.
6. Used for building to improve water retention and strength
7. It is used in the food industry. In the food industry, CMC with high displacement degree is used as the thickener of ice cream, cans, instant noodles, foam stabilizer of beer, etc., and it is used as the thickener, binder or shaping agent in the processing of jam, syrup, fruit juice, snacks, ice cream drinks, etc.
8. The pharmaceutical industry selects CMC with appropriate viscosity as the adhesive, disintegrant and suspension aid for tablets.
