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HPMC acts as a dispersant in building treatment

  • Categories:Industry news
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  • Time of issue:2019-06-18 12:24
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(Summary description)As a dispersant, thickener and binder in building treatment, HPMC is mainly used in the molding of cement mortar and gypsum products. It is used in cement mortar to increase its cohesiveness, reduce flocculation, improve viscosity and shrinkage, and retain water retention.

HPMC acts as a dispersant in building treatment

(Summary description)As a dispersant, thickener and binder in building treatment, HPMC is mainly used in the molding of cement mortar and gypsum products. It is used in cement mortar to increase its cohesiveness, reduce flocculation, improve viscosity and shrinkage, and retain water retention.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2019-06-18 12:24
  • Views:
Information
As a dispersant, thickener and binder in building treatment, HPMC is mainly used in the molding of cement mortar and gypsum products. It is used in cement mortar to increase its cohesiveness, reduce flocculation, improve viscosity and shrinkage, and retain water retention. Reduce the moisture loss on the concrete surface, improve the strength, prevent the occurrence of cracks and weathering of water-soluble salts; HPMC has thixotropic properties, can prepare low-flow, one-time thick plaster coating on vertical walls; HPMC improves adhesion and The construction performance is suitable for the preparation of easy-to-flow spray mortar for thin layer painting.
  
The amount of HPMC used in building materials is very small, only 0.1%~1%, but its role is large, it can be used as plasticizer, tackifier, water retaining agent, air entraining agent and retarding for coatings, plasters, mortars and cement products. The agent acts to increase the workability, water retention or adhesion to the substrate. In addition, it is also required for environmental protection. When dry mortar is mixed, the performance instability caused by on-site mixing and pollution to the surrounding environment are avoided, and the construction environment is poor and the flow efficiency is low. Tile adhesives and interior and exterior wall putty used to use more 107 adhesives. From an environmental point of view, it is more ideal to use cellulose ether, such as HEC and HPMC.
 
Although the cement has good bonding performance, the bonding performance of the cement slurry and the cement mortar is obviously different due to the difference in performance and different conditions of the bonding layer and the bonded surface during the construction process, especially when the water absorption performance of the bonding surface is large. , it will cause dehydration of the bonding surface, the plasticity of the cement mortar is greatly reduced, the adhesion is reduced, and the bonding strength is greatly reduced. In the past, gypsum or 107 glue was added to the cement mortar, but there were still some defects such as no measurement, some toxicity, and complicated construction process. The viscosity-increasing effect of cellulose ether in water and weak base. The effects of the addition of cellulose ether include: 1. Improving the initial and final setting time of the cement; 2. Increasing the limit of the cement mortar to overcome the stress; 3. Improving the water retention capacity of the cement and gypsum; 4. Compressing and resisting the cement mortar. The shear strength is reduced; 5. The bonding performance of the mortar is improved.

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