car brush washer
One of the remarkable features of HPMC is its solubility in cold water, a property that is not common in natural cellulose. The hydroxypropyl groups enhance the solubility of HPMC by disrupting hydrogen bonding in the cellulose structure, allowing it to dissolve in aqueous solutions. This makes HPMC an ideal thickening, gelling, and film-forming agent in various formulations.
chemical structure of hpmc

Denne reaktion sker under kontrollerede forhold, hvor temperatur og tryk nøje overvåges. Typisk foregår reaktionen ved omgivelsestemperatur i en kontinuerlig reaktor, hvilket sikrer en jævn fordeling af hydroxyethylgrupperne. Mængden af indført ethylenoxid spiller en afgørende rolle for det endelige produkts viskositet og opløselighed i vand. Efter reaktionen stopper man ved at neutralisere overskydende ethylenoxid, ofte ved at tilsætte vand eller en syre.
hydroxyethyl cellulose manufacturing process

The degree of substitution (DS) refers to the average number of hydroxyethyl groups substituting the hydroxyl groups in the cellulose. It is a crucial factor that determines the properties of HEC, such as its solubility, thickening power, and rheology. Manufacturers carefully control the conditions of the etherification process to achieve the desired DS, which can range from 0.1 to 2.5. Precise control during this stage ensures consistent performance of the HEC in various applications.
hydroxyethyl cellulose manufacturing process
