Hydroxypropyl Methyl Cellulose

Basic Information

Chemical Name: Hydroxypropyl Methyl Cellulose

Alias: Hypromellose, Cellulose Hydroxypropyl Methyl Ether

Molecular Formula: C3H7O

Physical Properties

Appearance: White or off - white fibrous or granular powder.

Particle Size: The pass rate of 100 mesh is greater than 98.5%, and the pass rate of 80 mesh is 100%. The particle size of special specifications is 40 - 60 mesh.

Carbonization Temperature: 280 - 300°C.

Apparent Density: 0.25 - 0.70g/cm³ (usually about 0.5g/cm³), and the specific gravity is 1.26 - 1.31.

Discoloration Temperature: 190 - 200°C.

Surface Tension: The surface tension of a 2% aqueous solution is 42 - 56dyne/cm.

Solubility: Soluble in water and some solvents, such as ethanol/water and propanol/water in appropriate proportions. The aqueous solution has surface activity, high transparency, and stable performance.

Chemical Properties

Non - ionic Property: It is a non - ionic polymer, does not complex with ionic species, and has pH stability, and its dissolution in water is not affected by the pH value.

Thermal Gelation Property: It can dissolve in water and undergo reversible gelation when heated. Different specifications of products have different gelation temperatures.

Other Properties: HPMC has the characteristics of thickening ability, low ash content, water retention, dimensional stability, excellent film - forming property, and broad enzyme resistance, dispersibility, and adhesiveness.

Uses

Construction Industry: As a water - retaining agent and retarder for cement mortar, it makes the mortar pumpable. It is used as an adhesive in plastering mortar, gypsum materials, putty powder, etc., to improve the spreadability and prolong the workable time. It is also used as an adhesive enhancer for pasting tiles, marble, and plastic decorations, and can reduce the amount of cement used.

Ceramic Manufacturing Industry: Widely used as an adhesive in the manufacture of ceramic products.

Coating Industry: As a thickener, dispersant, and stabilizer in the coating industry, it has good compatibility in water or organic solvents. It can also be used as a paint remover.

Pharmaceutical Industry: Used as a coating material, film material, rate - controlling polymer material for sustained - release preparations, stabilizer, suspending agent, tablet adhesive, and thickener.

Other Industries: Also widely used in leather, paper products, fruit and vegetable preservation, textile industry, etc.

Packaging and Storage

Packaging: Usually packed in 25 - kilogram three - layer paper bags with inner polyethylene bags for reinforcement.

Storage: Should be stored in a ventilated warehouse and operated in a closed manner.