Hydroxypropyl Methyl Cellulose (HPMC)
They are an odorless, tasteless, non-toxic white powder.
Their degree of substitution is generally 1.2~2.0. Their properties are influenced by the methoxy content and the hydroxypropyl content.
They are characterized by thickening ability, pH stability, water retention, dimensional stability, film formation, enzyme resistance, dispersibility and thermal gelation.
Category: Chemical Additives
Appearance：White or off-white powder
Chemical formula:R=CH2CH(CH3)OH
Viscosity range: 300-200000mPa·s
Gel temperature：60-75 %
PH Value：6-9
Moisture：≤5 %
Package: 25kg/bag
Consultation:Whatsapp/Wechat:+86 1777 404 8235
Product Features
1. Hydroxypropyl Methyl Cellulose (HPMC) is easily soluble in cold water, but difficult to dissolve in hot water. It can quickly disperse in hot water at the initial stage and dissolve quickly when cooled. The gelation temperature of hydroxypropyl methylcellulose (HPMC) in hot water is higher than that of methylcellulose (MC). The solubility in cold water is better than methyl cellulose (MC). Since the gelation temperature of HPMC is higher than that of MC, it is also more resistant to bacterial erosion.
2. The viscosity of Hydroxypropyl Methyl Cellulose (HPMC) is related to its molecular weight and temperature. Large molecular weight and high viscosity. As the temperature increases, the viscosity decreases. Their solutions are stable when stored at room temperature.
The effect of high temperature on the viscosity of Hydroxypropyl Methyl Cellulose (HPMC) is lower than that of methyl cellulose (MC). They have higher adhesion to mortar construction than methyl cellulose (MC).
Hydroxypropyl Methyl Cellulose (HPMC) mixed with water-soluble polymer compounds will become a uniform solution with higher viscosity. Such as polyvinyl alcohol, starch ether, vegetable gum, etc.
3. The water retention of Hydroxypropyl Methyl Cellulose (HPMC) depends on its addition amount, viscosity, etc. Its water retention rate is higher than that of methyl cellulose (MC) at the same dosage.
4. Hydroxypropyl Methyl Cellulose (HPMC) is stable to acids, alkalis and general salts. Its aqueous solution is very stable in the range of pH=2~12. Caustic soda and lime water have little effect on its performance. But the alkali can speed up its dissolution rate and increase the viscosity. When the concentration of salt solution is high, the viscosity of Hydroxypropyl Methyl Cellulose (HPMC) solution will increase.
5. Hydroxypropyl Methyl Cellulose (HPMC) has better enzyme resistance than methylcellulose (MC), and the probability of enzyme degradation in its solution is lower than that of methyl cellulose (MC).
