The water retention capacity of hydroxypropyl methylcellulose depends on the hydroxypropyl content. Under the same conditions, the water retention capacity of high hydroxypropyl methylcellulose is stronger, and the methoxy content of the same hydroxypropyl content is appropriately reduced. . The higher the content of hydroxypropyl methylcellulose, the greater its viscosity, so when choosing a product, you must choose the product that suits you according to the purpose of the product.
Temperature and other factors have an effect on the water retention of hydroxypropyl methylcellulose.
Thermal gel temperature:
Cellulose ether HPMC has a high thermal gelation temperature and good water retention; on the contrary, it has poor water retention.
Viscosity of cellulose ether HPMC:
When the viscosity of HPMC increases, its water retention also increases; when the viscosity increases to a certain extent, the increase in water retention decreases.
Cellulose ether HPMC homogeneous:
HPMC has a uniform reaction, uniform distribution of methoxyl and hydroxypropoxyl, and has good water retention.
Cellulose ether HPMC dosage:
The more the dosage, the higher the water retention rate and the more obvious the water retention effect.
When the addition amount is 0.25~0.6%, the water retention rate increases rapidly with the increase of the addition amount; when the addition amount increases further, the increase trend of the water retention rate slows down.
In short, the water retention of HPMC is related to factors such as temperature and viscosity, and its water retention is related to the amount of hydroxypropyl methylcellulose added. When the amount of hydroxypropyl methylcellulose reaches a certain value, its water retention performance reaches a balance.
Post time: Feb-23-2023