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HPMC can be used as a dispersant for building treatments.
Classification:
Industry News
Release time:
2019-06-18
HPMC, as a dispersant, thickener, and binder in construction processing, is mainly used for the molding of cement mortar and gypsum products. It is used in cement mortar to increase its adhesion, reduce flocculation, improve viscosity and shrinkage, and maintain moisture retention. It reduces moisture loss from the surface of concrete, increases strength, and prevents the occurrence of cracks and weathering caused by water-soluble salts; HPMC has thixotropic properties, allowing for the preparation of low-flow, thick gypsum coatings on vertical walls; HPMC can improve adhesion and structural performance, making it suitable for preparing easily flowable spray mortars for thin-layer coatings.
The amount of HPMC used in building materials is very small, only 0.1% to 1%, but its role is significant, serving as a plasticizer, tackifier, water-retaining agent, air-entraining agent, and retarder for coatings, plasters, mortars, and cement products. This reagent is used to increase workability, water retention, or adhesion to substrates. Additionally, it is required to be environmentally friendly. When dry powder mortar is mixed, it avoids performance instability caused by on-site mixing and surrounding environmental pollution, poor construction environment, and low flow efficiency. Tile adhesives and interior and exterior wall putties have previously 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, the bonding performance of cement paste and cement mortar is significantly different due to the varying performance and conditions of the bonding layer and bonding surface during construction, especially in terms of water absorption. The bonding surface is large, which can dehydrate the bonding surface, greatly reducing the plasticity of the cement mortar, decreasing adhesion, and significantly lowering 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. The thickening effect of cellulose ether in water and weak alkali. The effects of adding cellulose ether include: 1. Improving the initial and final setting time of cement; 2. Increasing the limit of cement mortar to overcome pressure; 3. Enhancing the water retention capacity of cement and gypsum; 4. Compaction and resistance to shear strength reduction of cement mortar; 5. Improving the bonding performance of the mortar.
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