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CMC For Construction Product Drying
Jul 21, 2017

CMC For Construction Product drying

Hydroxypropyl Methyl Cellulose in Building Chemical Reactions. Hydroxypropylmethylcellulose is dried, crushed, mixed and packaged by washing and bleaching of hydroxypropylmethylcellulose. Use a pump to hit a centrifuge, remove alcohol, methanol and other washing solvents, put rake vacuum dryer or steam machine recovery solvent. In these devices, the residual ethanol and moisture contained in the wet hydroxypropylmethylcellulose are gradually diffused and vaporized from the inside of the particles, and are carried out by the vacuum system to achieve the purpose of solvent recovery and product drying. Material by rake mixer or plow-type mixing teeth even flip, heat and dry, evaporated ethanol recovered by condensation, water vapor pumped by the hydraulic jet pump. Ethanol vapor, water vapor outlet with baffle dust collector to recover a small amount of dried hydroxypropyl methyl cellulose particles. Hydroxypropyl methylcellulose HPMC does not participate in any chemical reaction, only a secondary role. Putty powder add water, on the wall, is a chemical reaction, because there is a new material generation, the wall of the putty powder from the wall down, ground into powder, and then, it would not work, because the formation of new substances (calcium carbonate ) The. The main components of Ca (superscript 2 +) are Ca (OH) 2, CaO and a small amount of CaCO3, CaO + H2O = Ca (OH) 2-Ca (OH) 2 + CO2 = CaCO3 ↓ + H2O Calcium in water and air CO2, the role of calcium carbonate, and HPMC is only water, auxiliary calcium calcium better response, which itself is not involved in any reaction.

 Hydroxypropylmethylcellulose physical properties soluble in water and most polar organic solvents and the appropriate proportion of ethanol / water, propanol / water, dichloroethane, etc., in ether, acetone, anhydrous ethanol insoluble in cold water Swollen into a clear or slightly cloudy colloidal solution. The aqueous solution has the surface hydroxypropyl methyl cellulose molecular formula [1] activity, high transparency, stable performance. HPMC has the nature of hot gel, product water solution after heating to form gel precipitation, cooling and then dissolved, different specifications of the product gel temperature is different. Solubility changes with viscosity, the lower the viscosity, the greater the solubility, different specifications of the nature of HPMC have some differences, HPMC dissolved in water is not affected by the PH value. Particle size: 100 mesh pass rate greater than 100%.

Cellulose is a macromolecular polysaccharide composed of glucose. Do not dissolve in water and general organic solvents. Is the main component of the plant cell wall. Cellulose is the most widely distributed in nature, the most content of a polysaccharide, accounting for more than 50% of the carbon content of the plant sector. Cotton cellulose content of nearly 100%, the most pure natural cellulose source. General wood, cellulose accounted for 40 to 50%, there are 10 to 30% of hemicellulose and 20 to 30% of lignin.

effect:

Cellulose is the oldest and most abundant natural polymer on Earth, and is the most valuable natural renewable resource for human beings. Cellulose chemistry and industry began more than 160 years ago, is the birth of polymer chemistry and development of the main research object, cellulose and its derivatives research results for the polymer physics and chemistry disciplines of the creation, development and enrichment made a significant contribution The The world's cellulose for textile and paper, up to 8 million tons per year. In addition, it is possible to produce ester derivatives such as rayon, cellophane and nitrates and acetates by using the purified cellulose as a raw material, and also to produce methylcellulose, ethylcellulose, carboxymethylcellulose , Polyanionic cellulose and other ether derivatives, for oil drilling, food, ceramic glaze, cosmetic, synthetic washing, graphite products, pencil manufacturing, electronics, coatings, building materials, decoration, mosquito coils, tobacco, paper, rubber , Agriculture, adhesives, plastics, explosives, electrical and scientific research equipment and so on.