HPMC can be used as a dispersant in construction treatments
Release Date:
2021-03-02
HPMC, as a dispersant, thickener, and adhesive in construction processing, is mainly used for molding cement mortar and gypsum products. It is used in cement mortar to increase its adhesiveness, reduce flocculation, improve viscosity and shrinkage, and maintain moisture retention. It reduces moisture loss on the concrete surface, enhances strength, and prevents cracking and weathering caused by water-soluble salts; HPMC has thixotropy, allowing the preparation of low-flow, one-time thick gypsum coatings on vertical walls; HPMC can improve adhesion and structural performance, suitable for preparing easily flowable spray mortar for thin-layer coatings.
HPMC, as a dispersant, thickener, and adhesive in construction processing, is mainly used for molding cement mortar and gypsum products. It is used in cement mortar to increase its adhesiveness, reduce flocculation, improve viscosity and shrinkage, and maintain water retention. It reduces moisture loss on the concrete surface, enhances strength, and prevents cracks and weathering caused by water-soluble salts; HPMC has thixotropic properties, allowing the preparation of low-flow, one-time thick gypsum coatings on vertical walls; HPMC can improve adhesion and structural performance, suitable for preparing easily flowable spray mortar for thin-layer coatings.
The amount of HPMC used in building materials is very small, only 0.1% to 1%, but its effect is significant. It can be used as a plasticizer, thickener, water retention agent, air-entraining agent, and retarder for coatings, plaster, mortar, and other cement products. This agent is used to increase workability, water retention, or adhesion to the substrate. Additionally, it needs to be environmentally friendly. When mixing dry powder mortar, it avoids unstable performance caused by on-site mixing and environmental pollution, poor construction environment, and low flow efficiency. Tile adhesives and interior and exterior wall putties have used more than 107 types of adhesives. From an environmental perspective, the use of cellulose ethers such as HEC and HPMC is more ideal.
Although cement has good bonding properties, due to differences in the performance and conditions of the bonding layer and bonding surface during construction, the bonding performance between cement slurry and cement mortar is significantly different, especially in terms of water absorption. The bonding surface is large, which causes dehydration of the bonding surface, greatly reduces the plasticity of the cement mortar, decreases adhesion, and significantly lowers bonding strength. In the past, gypsum or 107 glue was added to cement mortar, but there were still some defects such as lack of measurement, toxicity, and complex construction processes. Cellulose ethers have a thickening effect in water and weak alkali. The effects of adding cellulose ethers include: 1. Improving the initial and final setting time of cement; 2. Increasing the limit of cement mortar to withstand pressure; 3. Enhancing the water retention capacity of cement and gypsum; 4. Compacting and resisting the reduction of shear strength in cement mortar; 5. Improving the adhesive properties of mortar.
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