Regarding the problem of the gel temperature of hydroxypropyl methylcellulose HPMC, many users rarely pay attention to the problem of the gel temperature of hydroxypropyl methylcellulose. Nowadays, hydroxypropyl methylcellulose is generally distinguished according to the 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 amount of methoxyl group is directly related to the degree of cellulose sourization, and the content of methoxyl group can be adjusted by controlling the formula, reaction temperature and reaction time. At the same time, the degree of inactivation affects the degree of substitution of hydroxyethyl or hydroxypropyl. Therefore, the water retention of cellulose ether with high gel temperature will be poor. This production process needs to be explored, so it is not that the production cost of cellulose ether is low if the methoxy content is low, on the contrary, the price will be higher.
The gel temperature is determined by methoxyl groups, and the water retention is determined by hydroxypropoxyl groups. 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 be separated from the water and lose its 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). When applying mortar, there is no need to pay special attention to the performance index of gel temperature.