The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
Soluble in water and some organic solvents
It is soluble in cold water, and its maximum concentration is only determined by viscosity. The solubility changes with viscosity. The lower the viscosity, the greater the solubility.
Salt tolerance
The hydroxypropyl methyl cellulose used in the construction is a non-ionic cellulose ether, which is not a polyelectrolyte. Therefore, in the presence of metal salt or organic electrolyte, it is relatively stable in aqueous solution, but excessive addition of electrolyte will cause gelation and precipitation.
Surface activity
Because the aqueous solution has surface active function, it can be used as a colloidal protective agent, emulsifier and dispersant. When heated to a certain temperature, the hydroxypropyl methylcellulose aqueous solution used for construction will become opaque, gel and precipitate, but when continuously cooled, it will return to its initial solution state, and the gel will occur And precipitation. The temperature mainly depends on their lubricants, suspending agents, protective colloids, emulsifiers and so on.
Mildew proof
It has good anti-mildew ability and good viscosity stability in long-term storage.
PH stable
The viscosity of the hydroxypropyl methylcellulose aqueous solution used for construction is hardly affected by acid or alkali, and the pH value is relatively stable in the range of 3.0 to 11.0. Shape retention
Since the highly concentrated aqueous solution of hydroxypropyl methylcellulose used for construction has special viscoelasticity compared with aqueous solutions of other polymers, its addition can improve the shape of extruded ceramic products.
Water retention
The hydrophilicity of the building-specific hydroxypropyl methylcellulose and the high viscosity of its aqueous solution are highly effective water retention agents. Other performance thickeners, film formers, adhesives, lubricants, suspension aids, protective colloids, emulsifiers, etc.
Tags:
