Classification and Application of Cellulose Ethers


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2020-09-18

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Classification and Application of Cellulose Ethers
 
 
Hydroxypropyl methyl cellulose, the appearance of white powder, non-toxic, tasteless. Can be dissolved in cold water and form a transparent viscous gel. Soluble in water can provide a variety of functions, in many industrial applications are used as a thickening agent, protective colloid, stabilizer, suspending agent and water retention agent.
Characteristics and uses:
It has good water retention, even if it is used on substrates with high water absorption. It can provide good operation performance and anti-sagging ability for mortar.
Compatible with a wide variety of surfactants and waterborne polymers. The particles are relatively fine, which is more conducive to mixing with gypsum, lime, cement and other materials, so that these mixtures are not easy to agglomerate when dispersed in water. It is very suitable for cement, lime and gypsum based plastering mortar, bonding mortar and similar products.
Used in cement-based materials also has the following characteristics:
In the mortar has a stronger thickening, water retention effect;
● Improve the operating performance of the material, make the material more slippery in operation, and improve the anti-sagging ability of the mortar;
Increase the open time of binder materials.
 
Cellulose alkyl ether
Representative are methyl cellulose and ethyl cellulose.
Methyl cellulose is widely used as thickener, adhesive and protective colloid. It can also be used as a dispersant for emulsion polymerization, a binder dispersant for seeds, a textile slurry, an additive for food and cosmetics, a pharmaceutical adhesive, a pharmaceutical coating material, and used in latex paints, printing inks, ceramic production, and mixed into cement to control setting time and increase initial strength.
Ethyl cellulose products have high mechanical strength, flexibility, heat resistance and cold resistance. Low-substituted ethyl cellulose is soluble in water and dilute alkali solution, and high-substituted products are soluble in most organic solvents. It has good compatibility with various resins and plasticizers. Can be used in the manufacture of plastics, films, varnishes, adhesives, latex and drug coating materials. The introduction of hydroxyalkyl group into cellulose alkyl ether can improve its solubility, reduce its sensitivity to salting out, increase the gelation temperature and improve the hot melt property. The degree of change in the above properties varies with the nature of the substituents and the ratio of alkyl to hydroxyalkyl.
 
cellulose hydroxyalkyl ether
Carboxymethyl cellulose is one of the most widely used water-soluble cellulose ethers. Used primarily as drilling mud in the past, it has now expanded to use as an additive to detergents, laundry slurries, latex paints, cardboard and paper coatings, etc. Pure carboxymethyl cellulose can be used in food, medicine, cosmetics, but also as a ceramic and mold adhesive.
Polyanionic cellulose (PAC) is an ionic cellulose ether and is a high-end alternative to carboxymethyl cellulose (C-cellulose). It is a white, white or yellowish powder or granule, non-toxic, tasteless, easy to dissolve in water, forming a transparent solution with a certain viscosity, with better heat stability and salt resistance, strong antibacterial properties, no moldy deterioration. It has the characteristics of high purity, high degree of substitution and uniform distribution of substituents. Can be used as a binder, thickener, rheology regulator, water loss agent, suspension stabilizer, etc. Polyanionic cellulose (PAC) is widely used in all industries where C cellulose can be applied. It can greatly reduce the dosage, facilitate use, provide better stability and meet higher process requirements
 
 

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