hydroxypropyl methylcellulose HPMC in the construction industry

The influence and application of hydroxypropyl methylcellulose HPMC in the construction industry:

There are many factors affecting the application of hydroxypropyl methylcellulose HPMC in building materials, especially gypsum-based plaster. The following editor will introduce to you:

1. Water retention

Hydroxypropyl methylcellulose for construction prevents the excessive absorption of water by the substrate, and when the gypsum is completely set, the water should be kept in the plaster as much as possible. This characteristic is called water retention and is directly proportional to the viscosity of the construction-specific hydroxypropyl methylcellulose solution in the stucco. The higher the viscosity of the solution, the higher its water retention capacity.

Once the water content is increased, the water retention capacity will decrease. This is because the increased water dilutes the solution of hydroxypropyl methylcellulose for construction, resulting in a decrease in viscosity.

2. Anti-sagging

A plaster with anti-sag properties allows applicators to apply thicker coats without sagging, and also means that the plaster itself is not thixotropic, which would otherwise slide down during application.

3. Reduce viscosity, easy construction

By adding various building-specific hydroxypropyl methylcellulose products, low-viscosity and easy-to-construct gypsum plaster can be made. When using low-viscosity grades of building-specific hydroxypropyl methylcellulose, the viscosity is relatively reduced The construction becomes easy, but the low-viscosity hydroxypropyl methylcellulose for construction has weak water retention capacity and needs to be used more.

4. Compatibility of stucco

For a fixed amount of dry mortar, it is more economical to produce a higher volume of wet mortar, which can be achieved by adding more water and air bubbles. However, when the amount of water and air bubbles is too much, the strength will be damaged.