Hydroxypropyl methylcellulose gel temperature problem
July 27, 2020
Many users seldom pay attention to the problem of hydroxypropyl methyl cellulose gel temperature. Nowadays, hydroxypropyl methyl cellulose is generally distinguished by viscosity, but for some special environments and special industries, only the viscosity of the product is Not enough, the following briefly introduces the hydroxypropyl methylcellulose gel temperature.
The amount of methoxy group is directly related to the degree of etherification of cellulose ether. The content of methoxy group can be adjusted by controlling the formula, reaction temperature and reaction time. At the same time, the degree of etherification affects the degree of substitution of hydroxyethyl or hydroxypropyl. Therefore, the water retention capacity of cellulose ethers with high gel temperature is generally poor. This production process has to be explored, so the price of cellulose ether is not low because of the low methoxy content, on the contrary, the price will be higher.
The gel temperature is determined by methoxy, and the water retention is determined by hydroxypropoxy. There are only three replaceable groups on cellulose. Find your suitable temperature, suitable water retention, and then determine the type of cellulose.
The gel temperature is a critical point for the application of cellulose ether. When the ambient temperature exceeds the gel temperature, the cellulose ether will precipitate out of the water and lose water retention. The gel temperature of cellulose ether on the market can basically meet the needs of the mortar use environment (except for special environments). I personally think that the performance index of gel temperature does not need to be paid special attention to when engaging in mortar applications. Of course, those engaged in the production of cellulose ethers Manufacturers must be considered.