Chinese alias: cellulose hydroxypropyl methyl ether; hydroxypropyl methyl cellulose
English name: Hypromellose
English alias: HPMC; E464; MHPC; Hydroxypropyl methylcellulose; Hydroxypropyl methyl cellulose;
CAS number: 9004-65-3
Molecular weight: 86000.00000

Physical properties
Appearance and properties: white or off-white fibrous or granular powder
Density: 1.39 g / cm3
Solubility: almost insoluble in anhydrous ethanol, ether, acetone; swells into cold or clear colloidal solution in cold water
Stability: Solids are flammable and incompatible with strong oxidants.

production method
The refined cotton cellulose was treated with an alkali solution at 35-40 ° C for half an hour, pressed, the cellulose was crushed, and the cellulose was appropriately aged at 35 ° C, so that the average degree of polymerization of the obtained alkali fiber was within the required range. Put the alkali fiber into the etherification kettle, add propylene oxide and methyl chloride in turn, and etherify at 50-80 ℃ for 5h, the maximum pressure is about 1.8MPa. Then add an appropriate amount of hydrochloric acid and oxalic acid to the hot water at 90 ° C to wash the material to make the volume expand. Dehydrate with a centrifuge. Wash until neutral. When the water content in the material is lower than 60%, dry it with hot air at 130 ℃ to less than 5%. Finally crushed through 20 mesh sieve to obtain the finished product.

use
This product is used as thickener, dispersant, binder, excipient, oil-resistant coating, filler, emulsifier and stabilizer in the textile industry. Also widely used in synthetic resin, petrochemical, ceramics, paper, leather, medicine, food and cosmetics industries.