2. The whiteness of pure HPMC cellulose is good, which means that the raw materials used in production are pure and the reaction is more thorough without impurities. Compared with relevant foreign cellulose ether products, it can be seen that the whiteness of a good cellulose ether product is always better than that of domestic second-line brand products.

Cellulose ether has a slow setting effect on mortar. With the increase of cellulose ether content, the setting time of mortar is prolonged. The retarding effect of cellulose ether on cement slurry mainly depends on the degree of substitution of alkyl group, which is not much related to its molecular weight. The lower the degree of alkyl substitution, the higher the hydroxyl content, the more obvious the retarding effect. And the higher the content of cellulose ether, the more obvious the retarding effect of the composite film on the early hydration of cement. Therefore, the more significant the retarding effect is.