Carboxymethyl cellulose (CMC)
- Category： Organic Compounds
Carboxymethyl cellulose (CMC)
Belonging to the anionic cellulose ether class, the appearance is white or slightly yellow flocculent fiber powder or white powder, odorless, tasteless, non-toxic; Easy to dissolve in cold or hot water, forming a transparent solution with a certain viscosity. The solution is neutral or slightly alkaline, insoluble in organic solvents such as ethanol, ether, isopropanol, acetone, etc., and soluble in ethanol or acetone solutions containing 60% water. It has hygroscopicity, is stable to light and heat, and its viscosity decreases with increasing temperature. The solution is stable at pH 2-10, and solid precipitation occurs when pH is below 2. Its viscosity decreases when pH is above 10. The color changing temperature is 227 ℃, the carbonization temperature is 252 ℃, and the surface tension of a 2% aqueous solution is 71mn/n.
Application of carboxymethyl cellulose (CMC)
1. Used for drilling, digging and other engineering projects related to oil and natural gas
① Mud containing CMC can form a thin and hard filter cake with low permeability in the wellbore, reducing water loss.
② After adding CMC to the mud, the drilling rig can obtain low initial shear force, making it easy for the mud to release the gas trapped inside, and quickly disposing of the debris in the mud pit.
③ Drilling mud, like other suspended dispersions, has a certain existence period, and adding CMC can stabilize it and prolong its existence period.
④ Mud containing CMC is rarely affected by mold, so there is no need to maintain a high pH value or use preservatives.
⑤ Containing CMC as a drilling mud cleaning fluid treatment agent, it can resist pollution from various soluble salts.
⑥ Mud containing CMC has good stability and can reduce water loss even at temperatures above 150 ℃.
CMC with high viscosity and high degree of substitution is suitable for low-density mud, while CMC with low viscosity and high degree of substitution is suitable for high-density mud. The selection of CMC should be determined based on different conditions such as mud type, region, and well depth.
2. CMC is used as a sizing agent in the textile and printing and dyeing industries. It is used for sizing light yarns of fabrics such as cotton, silk, chemical fibers, and blended fabrics;
3. CMC can be used as a paper smoothing agent and sizing agent in the papermaking industry. Adding 0.1% to 0.3% CMC to pulp can enhance the paper's tensile strength by 40% to 50%, increase its compressive strength by 50%, and increase its workability by 4 to 5 times.
4. CMC can be added to synthetic detergents as a dirt adsorbent; The glycerol aqueous solution of CMC in daily chemical products such as toothpaste industry is used as the base for toothpaste; Used in the pharmaceutical industry as thickeners and emulsifiers; CMC aqueous solution is used for flotation beneficiation after thickening.
5. Used in the ceramic industry as a raw material for adhesives, plasticizers, suspension agents for glazes, fixing agents, etc.
6. Used in construction 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, Dim sum, ice cream drinks, etc.
8. The pharmaceutical industry uses CMC with appropriate viscosity as an adhesive, disintegrant, and suspension aid for tablets.
Belonging to the anionic cellulose ether class, the appearance is white or slightly yellow flocculent fiber powder or white powder, odorless, tasteless, non-toxic; Easy to dissolve in cold or hot water, forming a transparent solution with a certain viscosity. The solution is neutral or slightly alkaline, insoluble in organic solvents such as ethanol, ether, isopropanol, acetone, etc., and soluble in ethanol or acetone solutions containing 60% water. It has hygroscopicity, is stable to light and heat, and its viscosity decreases with increasing temperature. The solution is stable at pH 2-10, and solid precipitation occurs when pH is below 2. Its viscosity decreases when pH is above 10. The color changing temperature is 227 ℃, the carbonization temperature is 252 ℃, and the surface tension of a 2% aqueous solution is 71mn/n.
Application of carboxymethyl cellulose (CMC)
1. Used for drilling, digging and other engineering projects related to oil and natural gas
① Mud containing CMC can form a thin and hard filter cake with low permeability in the wellbore, reducing water loss.
② After adding CMC to the mud, the drilling rig can obtain low initial shear force, making it easy for the mud to release the gas trapped inside, and quickly disposing of the debris in the mud pit.
③ Drilling mud, like other suspended dispersions, has a certain existence period, and adding CMC can stabilize it and prolong its existence period.
④ Mud containing CMC is rarely affected by mold, so there is no need to maintain a high pH value or use preservatives.
⑤ Containing CMC as a drilling mud cleaning fluid treatment agent, it can resist pollution from various soluble salts.
⑥ Mud containing CMC has good stability and can reduce water loss even at temperatures above 150 ℃.
CMC with high viscosity and high degree of substitution is suitable for low-density mud, while CMC with low viscosity and high degree of substitution is suitable for high-density mud. The selection of CMC should be determined based on different conditions such as mud type, region, and well depth.
2. CMC is used as a sizing agent in the textile and printing and dyeing industries. It is used for sizing light yarns of fabrics such as cotton, silk, chemical fibers, and blended fabrics;
3. CMC can be used as a paper smoothing agent and sizing agent in the papermaking industry. Adding 0.1% to 0.3% CMC to pulp can enhance the paper's tensile strength by 40% to 50%, increase its compressive strength by 50%, and increase its workability by 4 to 5 times.
4. CMC can be added to synthetic detergents as a dirt adsorbent; The glycerol aqueous solution of CMC in daily chemical products such as toothpaste industry is used as the base for toothpaste; Used in the pharmaceutical industry as thickeners and emulsifiers; CMC aqueous solution is used for flotation beneficiation after thickening.
5. Used in the ceramic industry as a raw material for adhesives, plasticizers, suspension agents for glazes, fixing agents, etc.
6. Used in construction 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, Dim sum, ice cream drinks, etc.
8. The pharmaceutical industry uses CMC with appropriate viscosity as an adhesive, disintegrant, and suspension aid for tablets.
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