1. HPMC is divided into instant type and fast dispersing type.
HPMC rapid dispersion type has the letter S as suffix. Glyoxal should be added during the production process.
HPMC quick-dispersing type does not add any letters, such as “100000″ means “100000 viscosity fast-dispersing HPMC”.
2. With or without S, the characteristics are different
Rapidly dispersing HPMC rapidly disperses in cold water and disappears in the water. The liquid has no viscosity at this time because the HPMC is only dispersed in the water and not really dissolved. After about two minutes, the viscosity of the liquid gradually increases, forming a transparent viscous liquid. Thick colloid.
Instant HPMC can be quickly dispersed in hot water at around 70°C. When the temperature drops to a certain temperature, the viscosity slowly appears until a transparent viscous colloid is formed.
3. With or without S, the purpose is different
Instant HPMC can only be used in putty powder and mortar. In liquid glues, paints and cleaning supplies, clumps may occur and become unusable.
Rapidly dispersing HPMC has a wide range of applications. It can be used for putty powder, mortar, liquid glue, paint, and cleaning supplies without any contraindications.
dissolution method
1. Take the required amount of hot water, put it into a container and heat it to above 80℃, then gradually add this product with slow stirring. The cellulose floats on the water surface at first, but gradually disperses to form a uniform slurry. Cool the solution while stirring.
2. Or heat 1/3 or 2/3 of the hot water to above 85°C, add cellulose to obtain a hot water slurry, then add the remaining amount of cold water, stir continuously, and cool the resulting mixture.
3. Cellulose has a relatively fine mesh size and exists as single small particles in the uniformly stirred powder. It dissolves quickly when exposed to water to form the required viscosity.
4. Add cellulose slowly and evenly at room temperature, stirring continuously until a clear solution forms.
What factors affect the water retention of hydroxypropyl methylcellulose?
The water retention of hydroxypropyl methylcellulose HPMC products itself is often affected by the following factors:
1. Homogeneity of cellulose ether HPMC
The uniformly reacted HPMC methoxy and hydroxypropoxy groups are evenly distributed and have high water retention.
2. Cellulose ether HPMC thermal gel temperature
The higher the temperature of the thermal conductive gel, the higher the water retention rate; conversely, the lower the water retention rate.
3. Viscosity of cellulose ether HPMC
When the viscosity of HPMC increases, the water retention rate also increases; when the viscosity reaches a certain level, the increase in water retention rate tends to be gentle.
Cellulose ether HPMC addition amount
The greater the amount of cellulose ether HPMC added, the higher the water retention rate and the better the water retention effect.
In the range of 0.25-0.6%, the water retention rate increases rapidly as the addition amount increases; when the addition amount further increases, the increase trend of the water retention rate slows down.
Post time: Feb-06-2024