The characteristics and benefits of hydroxypropyl methylcellulose used in building materials are many. Sleochem gives you a detailed introduction:
Characteristics of hydroxypropyl methyl cellulose
1. Mold resistance
It has relatively good mold resistance and good viscosity stability during long-term storage.
2. PH stability
The viscosity of the hydroxypropyl methyl cellulose aqueous solution is hardly affected by acid or alkali, and the PH value is relatively stable in the range of 3.0 to 11.0.
3. Shape maintenance
Since the highly concentrated aqueous solution of hydroxypropyl methylcellulose has special viscoelastic properties compared with the aqueous solutions of other polymers, its addition has the ability to improve the shape of the extruded ceramic products.
4. Water retention
Hydroxypropyl methylcellulose has the hydrophilicity and the high viscosity of its aqueous solution, and is a kind of highly effective water-retaining agent.
5. soluble in water
And some organic solvents can be dissolved in cold water, its concentration is only determined by the viscosity, the solubility changes with the viscosity, the lower the viscosity, the greater the solubility.
6. Salt resistance
Hydroxypropyl methylcellulose is a non-ionic cellulose ether, and it is not a polyelectrolyte. Therefore, in the presence of metal salts or organic electrolytes, it is relatively stable in aqueous solutions, but excessive addition of electrolytes can cause gelation and precipitation.
7. Surface activity
Since the aqueous solution has a surface active function, it can be used as a colloidal protective agent, emulsifier and dispersant.
8. hot gel
When the hydroxypropyl methylcellulose aqueous solution is heated to a certain temperature, it becomes opaque and a gel forms a precipitate, but upon continuous cooling, it returns to the original solution state, and the temperature at which this gel and precipitate occur Mainly depends on their lubricants, suspending agents, protective colloids, emulsifiers, etc. There are other characteristics of hydroxypropyl methylcellulose Thickener, film-forming agent, binder, lubricant, suspending agent, protective colloid, emulsifier, etc.