Hydroxypropyl methylcellulose is widely used in building materials. It is known as industrial monosodium glutamate. It is often called HPMC. It is an odorless and odorless white powdery substance that can be quickly dissolved in cold water. Clear viscous solution. The raw material of hydroxypropyl methylcellulose is mainly natural macromolecular material cellulose, which is often complex chemically processed, so that the obtained non-ionic cellulose ether has many characteristics, such as thickening, water retention, dispersion, Emulsifying, film-forming, binding, gelling and adsorption properties.
Hydroxypropyl methylcellulose is widely used in building materials. The following is a brief introduction to the role it plays in various building materials for reference only.
1. The advantages and functions of HPMC in putty powder and water-resistant putty
In putty powder, the main functions of cellulose ether in hydroxypropyl methylcellulose are bonding, water retention and lubrication, which can avoid cracks or powder removal caused by excessive water loss of putty. , It can also increase the adhesion of the putty, and also greatly reduce the sagging problem in the construction operation, which can make the construction more smooth and convenient.
2. The advantages and functions of HPMC in self-leveling materials
The stable viscosity of cellulose ether can ensure that the self-leveling material has good flow performance and self-leveling characteristics, and can control its water retention rate, so that it can solidify rapidly, and greatly reduce the shrinkage and cracking problems.
3. Advantages of HPMC in interface agent materials
It is mainly used as a thickener in the interface agent, which can improve the shear strength and tensile strength, effectively improve the surface of the coating, and enhance the adhesion of the coating surface and the strength of the bond.
4. Advantages of HPMC in tile adhesives
Due to its high water properties, hydroxypropyl methylcellulose does not need to pre-soak or wet the tiles and substrates, which can significantly improve the bonding strength. The slurry can be constructed for a long period of time, and the construction is convenient and uniform. And delicate, but also has good anti-slip properties.
5. The advantageous role of HPMC in the caulking agent
The addition of cellulose ether to the caulking agent makes it have good edge adhesion, high abrasion resistance and low shrinkage, thereby protecting the base material from mechanical damage and avoiding water penetration. adverse effects on the entire building.
6. The role and advantages of HPMC in external thermal insulation mortar materials
Cellulose ether mainly plays the role of bonding in the external wall insulation mortar material, which can increase the strength and make the mortar easier to coat. Crack performance, effectively improve the surface quality, improve the bond strength, while the higher water retention performance can prolong the service time of the mortar.
Due to the high water retention of hydroxypropyl methylcellulose, it can fully hydrate the cement, significantly increase the bond strength, and moderately improve the shear strength and tensile strength, effectively improving the quality of construction and efficiency. .