Basic information on hydroxypropyl methylcellulose.(HPMC)


This product is a non-ionic cellulose ether, the appearance of white powder, tasteless, dissolved dry water and most polar organic solvents and an appropriate proportion of ethanol / water, propane alcohol / water, dichloroethane, in ether, acetone, absolute ethanol insoluble, dissolved in cold water into a clear or slightly turbid colloid solution.Aqueous solution has surface activity, high transparency, stable performance, HPMC has thermogel properties, product aqueous solution after heating gel precipitation, and dissolved after cooling, different specifications of product gel temperature is different.The solubility varies with the viscosity.

The lower the viscosity, the greater the solubility, the properties of HPMC vary from different specifications, and the dissolution of HPMC in water is not affected by the PH value. three.

Performance characteristics:

1. This product can dissolve the dry cold water and form a transparent and sticky solution.

2. Water retention: because this product can only attach water several times heavier than itself, and maintain high water retention in mortar, gypsum, paint and other products.

3. Salt resistance: Since this product is a non-ionic and non-polymeric electrolyte, it is relatively stable in the aqueous solution of metal salts or organic electrolyte.In the case of excess electrolytes may cause gelling or precipitation.

4. Surface activity: The aqueous solution of this product has surface activity, with the function of colloidal protective agent, emulsifier and dispersant.

5. Thermal coagulation: when heated to a certain temperature.

This product becomes an opaque solution for the aqueous solution due to the gel or the generated precipitation.

But it gradually cooled and changed into its original solution state.

The temperature at which condensation and precipitation occur is determined by the type of product.

The concentration of the solution, and the heating rate.

6. PH stability: the viscosity of the aqueous solution is almost unaffected by acid and base, and its solution is stable in the range of PH3.0-11.0..

7. Lubrication: Adding this product can reduce the friction coefficient and improve the lubricity of extrusion ceramic products and cement products.

8. County float: it can prevent solid particles from precipitation, so it can inhibit the formation of sediment.

9. Binding: used as an adhesive for pigment, tobacco products and paper products, with excellent functions.


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