The main characteristics of hydroxyethylmethyl cellulose (HEMC) are:
1.Solubility: soluble in water and some organic solvents, HEMC can dissolve in cold water, its highest concentration is only determined by the viscosity, the solubility changes with the viscosity, the lower the viscosity, the greater the solubility.
2. Salt resistance: HEMC products are non-ionic cellulose ether, and not polymer electrolytes, so in the presence of metal salt or organic electrolyte, relatively stable in aqueous solution, but excessive addition of electrolyte, can cause gel and precipitation.
3. Surface activity: Because the aqueous solution has the surface activity function, it can be used as a colloidal protective agent, emulsifier and dispersant.
4. Thermogel: When HEMC product aqueous solution is heated to a certain temperature, it becomes opaque, gel forms precipitation, but in continuous cooling, it returns to the original solution state, and the temperature of this gel and precipitation mainly depends on their lubricant, auxiliary suspension agent, protective colloid, emulsifier, etc.
5. Metabolic inertia and low smell and fragrance: Because HEMC is not metabolized and low smell and fragrance, it is widely used in food and drugs.
6. Antibiotic resistance: HEMC has good mildew resistance and good viscosity stability in long-term storage.
7. PH stability: The viscosity of the aqueous solution of HEMC products is almost unaffected by acid or alkali, and the PH value is relatively stable in the range of 3.011.0.