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Chemical properties and main application of production of carboxymethyl cellulose

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Chemical properties and main application of production of carboxymethyl cellulose

  2015/7/10 16:14:41

By Carboxymethyl take substituted cellulose derivatives, treated with sodium hydroxide formation of cellulose in the alkali cellulose, with monochloroacetic acid reaction system was. There are 3 glucose units that can be substituted by the unit, so the products can be obtained with different degrees of substitution. The average per 1g dry weight was introduced into the 1mmol carboxymethyl group, which was not dissolved in water and dilute acid, but could be expanded for ion exchange chromatography. PKa was about 4 in pure water and about 3.5 in NaCl 0.5mol/L. It was weakly acidic cation exchanger, and it was usually used for neutral and alkaline protein separation by pH4. More than 40% hydroxyl groups are soluble in water to form a stable high viscosity colloid solution.
Carboxymethyl cellulose (CMC) is a non-toxic, odorless, white floc powder, stable performance, easy to dissolve in water, its water solution is neutral or alkaline transparent viscous liquid, soluble in other water solution of glue and resin, insoluble in organic solvents such as ethanol. CMC can be used as binder, thickener, suspending agent, emulsifier, dispersant, stabilizer, sizing agent, etc..
Sodium carboxymethyl cellulose (CMC) is the largest production of cellulose ethers, the most widely used and the most convenient products, commonly known as "industrial monosodium glutamate".
1, used in petroleum, natural gas drilling, digging well engineering
The mud with CMC can make a thin and firm wall, and the permeability of the filter cake is low, so that the water loss is reduced.
II in the mud in the addition of CMC, the drilling machine have low initial gel strength, the mud easily released wrapped inside the gas, at the same time, the debris soon abandoned in the pit.
In the same time, the drilling mud has a certain period of existence, which can make it stable and prolong its existence after adding CMC.
The CMC containing mud, little affected by mould effect, therefore, the requirement to maintain a high pH value, also need not use preservatives.
The CMC containing liquid treating agent of drilling mud flushing, anti pollution caused by various soluble salts.
The CMC containing mud, good stability, even if the temperature is above 150 DEG C can reduce water loss.
High viscosity, high degree of substitution of CMC is suitable for low density mud, low viscosity and high degree of substitution of CMC for large density of mud. Selection of CMC should be based on the type of mud and region, well depth and other conditions to decide.
2, for textile, printing and dyeing textile industry the CMC can be used as sizing agent, used for cotton, silk and wool, chemical fiber, blending fabric tunic sizing;
3, for the paper industry CMC in the paper industry can be used as a smoothing agent, sizing agent. In the pulp of 0.1% ~ 0.3% of the CMC can make the paper to enhance the tensile strength of 50% ~ 40%, the compressive strength increased by 50%, 4 ~ 5 fold increase.
4, adding CMC, synthetic detergent can be as dirt absorbent; daily chemical such as toothpaste industry CMC aqueous solutions of glycerol as a gum base for toothpaste; pharmaceutical industry is used as a thickener and emulsifier; CMC aqueous solution viscosity and then used as flotation.
5, for the ceramic industry can be used as adhesive, plasticizer, blank glaze suspending agent, fixing agent etc..
6, used in the construction, improve the water retention and strength
7, for the food industry, food industry with high degree of substitution CMC for ice cream, canned food, quick cooking thickener, beer foam stabilizer and so on, in the process the jam, syrup, sherbet, snacks, ice cream drinks such as as thickener, binder or because of the shape of the agent.
8, the pharmaceutical industry with proper viscosity CMC tablet binder, disintegrant, suspension of suspending agent.
Extension
Carboxymethyl cellulose (CMC) of high-end alternatives for poly anionic cellulose ((PAC) is also a kind of anionic cellulose ether, has more high degree of substitution and replace the homogeneous degree, shorter chain molecules, molecular structure tends to be more stable, so it has better performance of anti salt, anti acid, anti calcium and high temperature resistant etc., solubility also enhanced. All industries that are available in the application of carboxymethyl cellulose (CMC) can provide better stability and meet higher requirements.