MHPC Applications Thermal Insulation Mortar Additives HPMC Hydroxy Propyl Methyl Cellulose

MHPC Applications Thermal Insulation Mortar Additives HPMC Hydroxy Propyl Methyl Cellulose

Hydroxy Propyl Methyl Cellulose (HPMC) is a water-soluble nonionic cellulose ether that is prepared from cotton refined through series of chemical processing. It is odorless, tasteless and non-toxic white powder, easily dissolved in cold water, forming a clear or slightly solution and exhibiting excellent properties of thickening, binding, dispersing, gelling, surface activity and water retention. HPMC is widely used in construction industry, such as tile adhesives, dry mixed mortar, crack fillers, tile grouts, wall putty, skim coat, joint fillers and self-leveling cement plaster.

mhpc applications thermal insulation mortar additives hpmc hydroxy propyl methyl cellulose can significantly improve the workability of mortar, and its water retention ability makes it easier to spray and pump. This will reduce the time of construction and increase the quality of the finished products. In addition, it can also improve the bonding between sand particles and cement clinker, and promote the hydration of the mortar and its strength.

The moisture content, thermal conductivity and compressive strength of the fiber-insulated mortars were measured on the third, seventh and twenty-eighth days after sample maintenance. The results showed that the water content of the samples decreased with time, while the thermal conductivity gradually increased, which is due to the condensation and evaporation of water in the mortar. In addition, the moisture contents and thermal conductivities of the mortar with a higher hibiscus cannabinus fiber content were better than those of the reference mortar.

In addition, the cellular cellulose ether in the HPMC can form micro-expansive materials during hydration, which can prevent the mortar from absorbing too much water and making it prone to cracking or bursting. The hydration of the mortar is further promoted by the interaction between the cellulose and the cement, which enhances its strength and durability. It is also noted that the hydration process can take place at low temperatures, which can help to maintain its durability and freezing resistance.

The effect of hydroxypropyl methyl cellulose on the plastic viscosity of the mortar was also studied. The results showed that the plastic viscosity h of the mortar increases with increasing the concentration of the HPMC, and it is closely related to its water retention capacity. In addition, the cellulose ether can also improve the inter-particle cohesion of the mortar by forming a film around each sand particle. The sand particles in the control mortar were loosely packed and had free surfaces, while the sand particles in the HPMC-treated mortar were more compacted and had a more homogeneous structure, as shown in Figure 11a-j. The SEM images of the sand samples show that a filamentous HPMC colloid was formed in the interstitial fluid and acted as a bridge between the sand particles. The bonding between the sand particles was also enhanced by the hydration of the cellulose ether. This resulted in an improved cohesion of the mortar and enhanced its frost resistance and durability.

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