KimaCell® HEMC MH6M hydroxyethyl methyl cellulose is made of cotton, wood alkalized, ethylene oxide and methyl chloride ether Non-ionic cellulose mixed ether made by chemical process.
At present, the production process of HEMC can be divided into two categories: liquid phase method and gas phase method. The internal pressure of the liquid phase method equipment is small, the requirements for the pressure bearing capacity of the equipment are low, and the risk is small. After the cellulose is soaked in the lye, it will be fully swollen and alkalized.
The osmotic swelling of the liquid is good for cellulose, and the product with a relatively uniform degree of substitution and viscosity can be obtained, and the variety is easy to replace, but the reactor is usually not too large (generally below 15m3), and the production capacity is small. If you want to increase the production, It is bound to increase multiple reactors, and the reaction process requires a large amount of organic solvent as a carrier, and the reaction time is longer (generally more than 10 hours), which increases solvent distillation recovery and time costs. The gas-phase method has compact equipment, high single-batch yield, and the reaction is carried out in a horizontal autoclave. The time (generally 5-8 hours) is shorter than that of the liquid-phase method, and does not require a complicated solvent recovery system. After the reaction is completed, the excess methyl chloride The by-product dimethyl ether enters the recovery system in the form of gas, and is recycled and reused separately. The labor cost is low, the labor intensity is small, and the production cost is lower than that of the liquid phase method, but the investment in equipment and automatic control is large, and the technical content is high. The cost is high.
|Chemical name||Hydroxyethyl Methyl Cellulose|
|Synonym||Cellulose ether,2-hydroxyethyl methyl cellulose, Cellulose, 2-hydroxyethyl methyl ether, Methyl hydroxyethyl cellulose, HEMC, MHEC|
|Product Grade||HEMC MH6M|
|Solubility||Water Soluble Cellulose ether|
|Physical form||White to off-white cellulose powder|
|Viscosity Brookfield 2% solution||4800-7200mPa.s|
|Viscosity NDJ 2% solution||4800-7200mPa.s|
|Mesh size||99% pass 100mesh|
KimaCell® HEMC MH6M Cellulose ether can be used in thermal insulation mortar. The incorporation of hydroxyethyl methylcellulose has a certain influence on the drying shrinkage. With the increase of its content, the drying shrinkage first decreases and then increases. When the content is 2.4% and 3%, respectively, the shrinkage reaches the minimum value. and the maximum value. The mass loss and drying shrinkage of inorganic thermal insulation mortar have the same trend. With the increase of cellulose ether content, it first decreases and then increases. When the content is 3%, the mass loss is the largest; the mass loss increases, and the drying shrinkage increases. are not relevant. The addition of hydroxyethyl methylcellulose improves the pore size distribution, and multiple peaks appear in the pore size less than 5nm and 10nm, so that the pore size less than 10nm shows a trend of first decreasing and then increasing with the increase of cellulose ether content. When the dosage is 3%, the pore diameter of less than 10nm is higher than that of other inorganic thermal insulation mortar. As the content of cellulose ether increases, the most probable pore size first increases and then decreases.
Small, most likely the pore radius is small, the corresponding drying shrinkage value is large, and vice versa.