HPMC (that is, hydroxypropyl methylcellulose) is an important ingredient in the production of tile adhesives. It enhances the adhesion, workability and water retention of tile adhesives. In this article, we will give you a comprehensive guide to using HPMC in tile adhesive applications.
1. Introduction to HPMC
HPMC is a non-ionic cellulose ether obtained by modifying natural cellulose. The manufacturing process involves treating cellulose with alkali to dissolve it, then adding methyl chloride and propylene oxide to modify it. The result is a white or off-white powder that is readily soluble in water.
2. Characteristics of HPMC
HPMC is a highly versatile polymer with many outstanding properties. Some of its important features include:
- Excellent water retention
- high adhesion
- Enhanced machinability
- Improved sag resistance
- Enhanced slip resistance
- good mobility
- Improved opening hours
3. Advantages of HPMC in tile adhesive application
When used in tile adhesive production, HPMC offers many advantages including:
- Better water retention for improved tile adhesive performance in wet areas
- Improved adhesive properties to ensure tiles are firmly held in place
- Improved machinability ensures ease of application and reduces the effort required to achieve a smooth surface
- Reduces shrinkage and sagging, enhancing the aesthetics of tile surfaces
- Improves the consistency of tile adhesives, promoting even and accurate application
- Enhanced slip resistance for increased safety on tile surfaces
4. Use of HPMC in Tile Adhesive Applications
HPMC is used as a thickener, adhesive, water retaining agent and rheology modifier in tile adhesive applications. Typically added at 0.5% – 2.0% (w/w) of the total dry mix. Below are some key areas for using HPMC.
4.1 Water retention
The tile adhesive needs to be left intact so that the installer has enough time to fix the tile. The use of HPMC provides excellent water retention and prevents the adhesive from drying too quickly. It also means that the adhesive does not need to be rehydrated, which can lead to inconsistent performance.
4.2 Improve adhesion
The adhesive properties of HPMC significantly enhance the bond strength of tile adhesives. It helps ensure that the tile stays securely in place, even in high traffic areas or wet locations.
4.3 Machinability
HPMC improves the workability of tile adhesives, making it easier to apply and achieve a smooth surface. It makes the adhesive easier to comb, reducing the effort required to push the adhesive onto the surface.
4.4 Reduce shrinkage and sagging
Over time, tile adhesive can shrink or sag, resulting in an unsightly and unsafe finish. The use of HPMC significantly reduces shrinkage and sagging, ensuring a uniform and aesthetically pleasing finish.
4.5 Improve slip resistance
Slips and falls are a significant hazard on tile surfaces, especially when wet. The enhanced slip resistance of HPMC makes the tile adhesives used safer and reduces the risk of slips and falls.
5. How to Use HPMC in Tile Adhesive Applications
HPMC is typically added at a rate of 0.5% – 2.0% (w/w) of the total dry mixture. It should be pre-mixed with Portland cement, sand and other dry powder and other additives before adding water. Below are the steps involved in using HPMC in tile adhesive applications.
- Add dry powder to mixing container.
- Add HPMC to the powder mix
- Stir the powder mixture until the HPMC is evenly distributed.
- Slowly add water to the mixture while stirring constantly to avoid lumps.
- Continue to whisk until the mixture is smooth and has a uniform consistency.
6. Conclusion
HPMC is a key ingredient in the production of tile adhesives, offering valuable benefits such as enhanced adhesion, improved processability, and reduced shrinkage and sagging. Using HPMC in tile adhesive applications requires proper mixing and dosage for optimal results.
Therefore, we strongly recommend the use of HPMC in the production of tile adhesives to enjoy its advantages and improve the quality of the finished surface.