HPMC Safety and Production
Raw Material Source: Made from cotton cellulose through processes such as alkali treatment and etherification.
Safety Certification: FDA approved for oral formulations; WHO has not set a daily intake limit (excessive intake may cause diarrhea).
Grading Standards: Classified into three types according to purity: pharmaceutical grade (Hypromellose), food grade, and industrial grade.
Core Applications
Building Materials
Cement Mortar Water Retention Agent: Extends setting time by approximately 30% and reduces hollowness by over 40%.
Tile Adhesive: Increases bond strength by over 1.5 MPa.
Pharmaceutical Preparations
Tablet Coating and Sustained-Release Carcass Material (Pharmaceutical Grade Hypromellose).
Eye Drop Thickener: Stabilizes solution pH within the range of 3-11.
Industrial Applications
PVC Suspension Polymerization Dispersant: Replaces traditional polyvinyl alcohol systems.
Coating Thickener: Increases coating viscosity by 80-120%.
Hydroxypropyl Methylcellulose
HPMC is the abbreviation for hydroxypropyl methylcellulose, a non-ionic cellulose mixed ether. It possesses thickening, water-retaining, and film-forming properties, and is widely used in building materials, pharmaceuticals, food, and other fields.
HPMC Properties
Chemical Properties: White powdery cellulose derivative, soluble in cold water and some organic solvents. Aqueous solutions exhibit high transparency (methoxyl content 28-30%, hydroxypropoxyl content 7-10%).
Thermal Stability: Gel temperature varies with methoxyl content; carbonization temperature 280-300℃; discoloration temperature 190-200℃.
Physical Properties: Viscosity range 3-50 mPa·s (varies greatly between different grades); bulk density 0.25-0.70 g/cm³.