Paint grade--Application of CMC in Printing and Dyeing

Carboxymethyl cellulose (CMC) is an 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 an adhesive, thickener, suspending agent, emulsifier, dispersant, stabilizer, sizing agent, etc.
Sodium carboxymethyl cellulose (CMC), commonly known as "industrial monosodium glutamate", is a product with a large yield, wide use, and convenient use among cellulose ethers.
1. Used in oil and gas drilling, well digging, and other projects
① CMC containing mud can form thin and strong filter cakes with low permeability on the well wall, reducing water loss.
② After adding CMC to the mud, the drill can obtain a low initial shear force, making it easy for the mud to release the gas wrapped in it, and at the same time, it can quickly discard the debris into the mud pit.
③ Drilling mud, like other suspended dispersions, has a certain lifetime, which can be stabilized and extended by adding CMC.
④ Mud containing CMC is rarely affected by mold, so it is not necessary to maintain a high pH value or use preservatives.
⑤ Containing CMC as a treatment agent for drilling mud and flushing fluid, it can resist the pollution of various soluble salts.
⑥ The slurry containing CMC has good stability and can reduce water loss even when 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. The selection of CMC should be determined based on different conditions such as mud type, region, and well depth.
2. Used in textile, printing and dyeing industries. CMC is used as a sizing agent in the textile industry for sizing light yarns of strong fabrics such as cotton, silk and wool, chemical fibers, and blends;
3. CMC used in the paper industry can be used as a paper surface smoothing agent and sizing agent in the paper industry. Adding 0.1% to 0.3% CMC to the pulp can enhance the tensile strength of the paper by 40% to 50%, increase the compressive cracking degree by 50%, and increase the knedability by 4 to 5 times.
4. CMC can be added to synthetic detergents as a dirt adsorbent; The glycerol aqueous solution of daily chemicals such as CMC in the toothpaste industry is used as the glue base for toothpaste; Used in the pharmaceutical industry as thickeners and emulsifiers; CMC aqueous solution is used for flotation after viscosity increasing.
5. Used in the ceramic industry as an adhesive, plasticizer, suspension agent for glaze agents, and color fixing agent for workpieces.
6. Used in buildings 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 selects CMC with appropriate viscosity as the adhesive, disintegrant, and suspension aid for tablets.
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The high-end alternative product of carboxymethyl cellulose (CMC) is polyanionic cellulose (PAC), which is also an anionic cellulose ether with higher degree of substitution and uniformity of substitution, shorter molecular chains, and more stable molecular structure. Therefore, it has better salt resistance, acid resistance, calcium resistance, high temperature resistance, and other properties, and enhanced solubility. Applied to all industries where carboxymethyl cellulose (CMC) can be applied, it can provide better stability and meet higher process requirements.