Hydroxypropyl methylcellulose and hydroxymethylcelluloseThe main differences are:
Raw materials and preparation: Hydroxypropyl methylcellulose is made of highly pure cotton cellulose as raw material, specially etherified under alkaline conditions, and does not contain any active ingredients such as animal organs and oils. Hydroxymethylcellulose is formed by the reaction of the hydroxyl group of the grape anhydride unit on the cellulose chain with the etherification group (chloroacetic acid or ethylene oxide).
Physical properties: Hydroxypropyl methylcellulose is water-soluble and has a high viscosity. It is soluble in water and most polar and appropriate proportions of ethanol water, propanol water, dichloroethane, etc., and is insoluble in ether, acetone, and absolute ethanol. The properties of hydroxymethyl cellulose are relatively different, it is also soluble in water, alkaline aqueous solution, ammonia and cellulose solution, but insoluble in organic solution, mineral oil colorless amorphous.
Uses:: Hydroxypropyl methylcellulose is 1 because of its thickening and water-retaining effect5 3 kg, often used in dry-mix mortar putty powder. The application of hydroxymethyl cellulose is more extensive, which can be used for sizing, calendering and thickener in the textile industry; structural constituents in the production of paper and cardboard; reabsorption of impurities in synthetic cleaning agents; Flotation agent for the selection of copper-nickel and potassium ores; viscous suspension thickeners and stabilizers for oil and gas well drilling; the adhesive composition of the wallpaper; Dry construction mixture composition; Water emulsion paint composition, etc.
In summary, there are certain differences between hydroxypropyl methyl cellulose and hydroxymethyl cellulose in terms of raw materials and preparation, physical properties and uses. In practice, it is necessary to select the right material according to the specific requirements. Hydroxypropyl methylcellulose ether manufacturer