Regarding the gel temperature of hydroxypropyl methyl cellulose HPMC, many users rarely pay attention to the gel temperature of hydroxypropyl methyl cellulose. Now hydroxypropyl methyl cellulose is generally distinguished according to its viscosity, but for For some special environments and special industries, it is not enough to only reflect the viscosity of the product. The following briefly introduces the gel temperature of hydroxypropyl methylcellulose.
The content of methoxy groups is directly related to the degree of dialysis of cellulose, and the content of methoxy groups can be adjusted by controlling the formula, reaction temperature and reaction time. At the same time, the degree of carboxylation affects the degree of substitution of hydroxyethyl or hydroxypropyl. Therefore, the water retention of cellulose ethers with high gel temperature is generally a little worse. This production process needs to be explored, so it is not that the content of methoxy group is low, the production cost of cellulose ether is low, on the contrary, its price will be higher.
The gel temperature is determined by the methoxy group, and the water retention is determined by the hydroxypropoxy group. There are only three substitutable groups on cellulose. Find your suitable use temperature, suitable water retention, and then determine the model of this 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 separate from water and lose water retention. The gel temperature of cellulose ethers on the market can basically meet the needs of the environment where the mortar is used.