Hydroxypropyl methylcellulose (HPMC，hypromellose), also known as E464，MHPC, is a kind of non-ionic cellulose mixed ether. It is a semi synthetic, inactive, viscoelastic polymer. Its main uses are as follows:

• As dispersant In the production of PVC;
• As thickener, stabilizer, emulsifier and film-forming agent in the production of petrochemical, coatings, building materials, paint remover, papermaking, cosmetics and other products;
• It is used in the construction of wall, plaster, caulking, etc., in the construction process of construction industry;
• It is used to adhesive ceramic tile, marble and plastic decoration, with high paste strength and less cement consumption in the decorative construction;
• Used as thickener in coating industry, it can make the layer bright and fine, without depigmentation, improve leveling performance, etc.

English Name: Hydroxypropyl methyl cellulose

Also Known as: HPMC, E464, MHPC, Hydroxypropyl methyl cellulose；Hydroxypropyl methyl cellulose;

CAS No.: 9004-65-3

Appearance: White fibrous or granular powder

Safety Description: S24 / 25

Molecular formula: C32H60O19

Molecular weight: 748.8074

EINECS No.: 220-971-6

Physical and chemical properties

• Appearance: White or off-white powder.
• Particle size: The passing rate of 100 mesh was more than 98.5%;
• The passing rate of 80 mesh is more than 100%.
• Carbonization temperature: 280-300 ℃
• Apparent density: 0.25-0.70/cm3 (usually about 0.5g/cm3), 5, specific gravity 1.26-1.31.
• Discoloration temperature: 190-200 ℃
• Surface tension: 42-56 dyn / cm in 2% aqueous solution
• Soluble in water and some solvents,
• Such as appropriate proportion of ethanol / water, propanol / water, trichloroethane, etc. The aqueous solution has surface activity. High transparency,
• Stable performance,
• The gel temperature of different specifications is different.
• The solubility changes with viscosity. The lower the viscosity is, the greater the solubility is
• The performance of HPMC with different specifications is different
• The dissolution of HPMC in water was not affected by pH value.
• HPMC decreased with methoxyl content, gel point increased, water solubility decreased, and surface activity decreased.
• HPMC also has thickening ability, salt resistance, low ash powder, pH stability, water retention, dimensional stability, excellent film-forming property, as well as a wide range of enzyme resistance, dispersion and adhesion.

Dissolution method

1. Gradually add the HPMC with slow stirring in the required amount of hot water at above 85 ℃ in a container. The Cellulose is gradually dispersed to form a uniform slurry. Cool the solution under stirring.
2. 1 / 3 or 2 / 3 of the required hot water is heated to 85 ℃ or more
   a) the cellulose is added with stirring to obtain hot water slurry,
   b) and then add the remained cold water with keeping stirring to uniform slurry is obtained by cooling.

Storage and transportation

• HPMC of various viscosities are packed in paper bags lined with polyethylene film, net weight of 25kg each bag;
• Keep away from sunlight, rain and moisture during storage and transportation.