What is the main use of carboxymethyl cellulose(CMC）?
Carboxymethylcellulose is a carboxymethyl group substituted product of cellulose. Depending on its molecular weight or degree of substitution, it may be a fully dissolved or insoluble polymer. The latter can be used as a weak acid type cation exchanger for separating neutral or basic proteins and the like.
Carboxymethyl cellulose can form high-viscosity colloids,for instance solutions, adhesion, thickening, flow, emulsification, dispersion, shaping, water retention, protective colloid, film formation, acid resistance, salt resistance, suspension and other characteristics.
It is physiologically harmless and is therefore widely use in the production of food, medicine, daily chemicals, petroleum, paper, textile, construction and other fields.
Sodium carboxymethyl cellulose (CMC) is the most abundant, most versatile and most convenient product of cellulose ethers, commonly known as “industrial MSG”.
1. Drilling, digging and other engineering for oil and natural gas
1 )Mud containing CMC can make the well wall a thin, firm, low permeability filter cake.so reduce the amount of water loss.
2 )After adding CMC to the mud, the rig can get a low initial shear force. The mud is easy to release the gas wrap inside, and the debris is quickly discard in the mud pit.
3 )Drilling mud, like other suspensions, has a certain lifetime. Adding CMC will stabilize it and prolong its life.
4 )Mud containing CMC, rarely affected by mold. Therefore, it is not necessary to maintain a high pH value and it is not necessary to use a preservative.
5 )containing CMC for drilling mud washing fluid treatment agent, can resist the pollution of various soluble salts. 6 mud with CMC, good stability. Even if the temperature is above 150 °C, the water loss can be reduced.
High viscosity, high substitution CMC is suitable for low density mud. Low viscosity, high degree of substitution CMC is suitable for high density mud. The choice of CMC should be determine according to the type of mud and the area and other conditions.
2. For the textile, printing and dyeing industry The textile industry uses CMC for instance a sizing agent for the sizing of cotton, silk, chemical fiber, blended and other strong materials;
3, used in the paper industry CMC can be use as a paper smoothing agent and sizing agent in the paper industry. Meanwhile adding 0.1% to 0.3% of CMC to the pulp can increase the tensile strength of the paper by 40% to 50%, the crushing resistance by 50%, and the enthalpy by 4 to 5 times.
4, CMC added to the synthetic detergent can be use as a dirt adsorbent; daily chemical such as toothpaste industry CMC glycerin aqueous solution used as a base for toothpaste; the pharmaceutical industry used as a thickener and emulsifier; CMC aqueous solution is use for instance a floating agent after thickening Mineral processing, etc.
5. Used in the ceramic industry as an adhesive for instance blanks, plasticizers, suspensions for glazes, fixing agents, etc.
6, for construction, during improve water retention and strength
7. For the food industry,similarly the food industry uses high-substituted CMC for ice cream, canned food, quick-cooking surface thickener, beer foam stabilizer, etc., in the processing of jam, sugar juice, sherbet, snacks, ice cream drinks, etc. It is a thickener, binder or a morphing agent.
8.Meanwhile the pharmaceutical industry selects appropriate viscosity CMC as a binder, disintegrator, suspending agent and the like for tablets.