HPMC can be used as dispersant for building treatment

HPMC Hydroxypropyl Methyl Cellulose as a dispersant, thickener and adhesive in Building Chemical Additive, mainly used in the formation of cement mortar and gypsum products. It is used in cement mortars to increase their adhesion, reduce flocculation, improve viscosity and shrinkage, and maintain moisture retention. Reduce the water loss on the concrete surface, improve the strength, and prevent the crack and weathering of water-soluble salt; HPMC has thixotropy and can prepare low flow, one-time thick gypsum coating on vertical wall. HPMC can improve adhesion, structural properties suitable for the preparation of easy to flow spray mortar, for thin coating.

 

The amount of HPMC used in building materials is very small, only 0.1% ~ 1%, but its effect is large, and it can be used as a plasticizer, Building &Construction Applied Sealant, viscosifier, water retention agent, air entraining agent and retarding agent of paint, mortar, mortar, etc. Cement products. The reagent is used to increase workability, water retention or adhesion to the substrate. In addition, it needs to be environmentally friendly. When the dry powder mortar is mixed, it avoids the unstable performance caused by the site mixing and the surrounding environmental pollution, the construction environment is poor and the flow efficiency is low. More than 107 adhesives were used for tile adhesives and interior and exterior putty. From an environmental point of view, it is more ideal to use cellulose ethers, such as HEC and HPMC.

 

Although cement has good bonding properties, due to the different properties and conditions of the bonding layer and bonding surface in the construction process, the bonding properties of cement slurry and cement mortar are obviously different, especially in terms of water absorption. The bonding surface is large. It will dehydrate the bonding surface, greatly reduce the plasticity of cement mortar, reduce the adhesion, and greatly reduce the bonding strength. In the past, gypsum or 107 glue was added to cement mortar, but there are still some defects, such as no measurement, toxicity, and complex construction technology. Viscosification of cellulose ether in water and weak base. The effects of adding cellulose ether include: 1. Improve the initial and final setting time of cement; 2. Increase the limit of cement mortar to overcome the pressure; 3. Improve the water retention capacity of cement and gypsum; 4. Compacts and resists cement mortar. Shear strength decreased; 5. The bonding performance of mortar is improved.