Hydroxypropyl methyl cellulose, alias: methyl hydroxypropyl cellulose, hypromellose, English abbreviation: HPMC, MHPC.
HPMC is a non-ionic cellulose ether made from refined cotton after alkalization, using propylene oxide and methyl chloride as etherification agents, through a series of reactions; and HEMC is produced from refined cotton after alkalization treatment, using ethylene oxide and methyl chloride as etherification agents, after a series of reactions, because the storage and use risk factor of ethylene oxide is higher than that of propylene oxide, so The production technology and process requirements of HEMC are higher. There are fewer manufacturers and the price of HEMC is higher than that of HPMC.
Performance index difference
The gel temperature of HEMC is higher, generally the gel temperature can reach about 78-85 ℃; while the gel temperature of HPMC is generally about 55-70 ℃, so HPMC is not as effective as HEMC in high temperature resistance. This is the main reason why many customers in hot areas choose HEMC.
Generally speaking, the water retention of HEMC is higher than that of HPMC, but there is no big difference. Considering the cost and price, if there is not high requirements for the gel temperature, customers generally prefer HPMC. Furthermore, the viscosity stability, mildew resistance, and dispersibility of HEMC are generally higher than that of HPMC.
Application field difference
The application fields of HPMC and HEMC are basically the same. They are both widely used in construction mortar, putty, coatings, daily chemicals, ceramics, papermaking, etc. Among the real stone paint, the effect of using HEMC is better. These two products are mainly used in construction. The main difference is gel temperature. The high temperature resistance of HEMC is better.
Post time: Jun-24-2021