HPMC Z407 Hydroxypropylmethyl Cellulose

HPMC is a cellulose variety whose output and consumption are increasing rapidly in recent years. It is a non-ionic cellulose mixed ether made from refined cotton after alkali treatment, using propylene oxide and methyl chloride as etherifying agents, and through a series of reactions. The degree of substitution is generally 1.2 to 2.0. Its properties vary depending on the proportion of methoxyl content and hydroxypropyl content.

(1) HPMC is easily soluble in cold water, but difficult to dissolve in hot water. But its gelation temperature in hot water is significantly higher than that of methyl cellulose. The dissolution in cold water is also greatly improved compared with methyl cellulose.

(2) The viscosity of HPMC is related to its molecular weight, and the larger the molecular weight, the higher the viscosity. Temperature also affects its viscosity, as temperature increases, viscosity decreases. But its viscosity is less affected by high temperature than methyl cellulose. Its solution is stable on storage at room temperature.

(3) The water retention of HPMC depends on its addition amount, viscosity, etc. The water retention rate under the same addition amount is higher than that of methyl cellulose.

(4) HPMC is stable to acid and alkali, and its aqueous solution is very stable in the range of pH=2~12. Caustic soda and lime water have little effect on its performance, but alkali can speed up its dissolution and increase the viscosity. Hydroxypropyl methylcellulose is stable to common salts, but when the concentration of the salt solution is high, the viscosity of the hydroxypropyl methylcellulose solution tends to increase.

(5) HPMC can be mixed with water-soluble polymer compounds to form a solution with uniform and higher viscosity. Such as polyvinyl alcohol, starch ether, vegetable gum, etc.

(6) HPMC has better enzymatic resistance than methyl cellulose, and its solution enzymatic degradation possibility is lower than that of methyl cellulose.

(7) The adhesiveness of HPMC to mortar construction is higher than that of methyl cellulose.