The role of hydroxypropyl methylcellulose in wet mix mortar

Gypsum mortar is a building material with gypsum as the main component. Gypsum accounts for 70% to 80% of the total weight of the mortar. Other components include lime, silicate, etc. The following is a summary of the effects of several mortar additives on gypsum mortar.

Hydroxypropyl Methyl Cellulose s a water retaining agent and retarder for cement mortar, it makes the mortar pumpable. Used as a binder in plaster, plaster, putty powder or other building materials to improve spreadability and extend operating time. Used as a pasting tile, marble, plastic decoration, pasting enhancer, and can also reduce the amount of cement. The water retention property of hydroxypropyl methylcellulose HPMC prevents the slurry from cracking due to drying too quickly after application, and enhances the strength after hardening.

1. HPMC is stable to acids and alkali, and its aqueous solution is very stable in the range of pH=2-12, which improves the viscosity of gypsum mortar.

2. HPMC has a water-retaining effect on the mortar system, reduces the bleeding rate and delamination degree of the mortar, improves the cohesion of the mortar, effectively inhibits the formation of mortar cracks, and reduces the mortar cracking index.

3. Hydroxypropyl Methyl Cellulose is very stable in aqueous solutions containing metal salts and organic electrolytes, and can be added to building materials for a long time to ensure improved durability.

4. The working performance of the mortar is significantly improved, the wall joints are full, the surface is smooth, the mortar and the base layer are firmly bonded, and the operation time can be extended.

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