China Building Polymer Hydroxypropyl Methyl Cellulose

Hydroxypropyl methylcellulose is a white powder, high-purity cotton cellulose is used as the raw material, treated with alkaline solution for half an hour, pressed, crushed cellulose, and aged, so that the resulting alkali fiber is averagely polymerized The degree is within the required range. Put the alkali fiber into the etherification kettle, and then add propylene oxide and methyl chloride in sequence for etherification, and then add appropriate amount of hydrochloric acid and oxalic acid to the washing material in hot water at 90 ° C to expand the volume. Dehydrate with a centrifuge. Wash to neutrality, when the water content in the material is less than 60%, dry with a hot air flow of 130 ºC to less than 5%. This is the whole process of making hydroxypropyl methyl cellulose. Its chemical properties are extremely soluble in water, and its PH value is relatively stable. It has water retention, thickening, adhesiveness, etc., and is widely used in the construction industry, such as paint, putty, mortar, etc .; it has become an indispensable material.