The self-leveling mortar additive uses low-viscosity hydroxypropyl methyl cellulose hpmc. The self-leveling mortar includes gypsum-based and cement-based self-leveling mortar. Due to the poor water resistance and abrasion resistance of gypsum-based self-leveling mortar, the scope of use is limited.
The self-leveling mortar additive uses low-viscosity hydroxypropyl methyl cellulose hpmc. The self-leveling mortar includes gypsum-based and cement-based self-leveling mortar. Due to the poor water resistance and abrasion resistance of gypsum-based self-leveling mortar, the scope of use is limited. The key of cement-based self-leveling mortar is to improve the rheological properties of the material under the condition of low water-cement ratio; under the premise of large fluidity, it is required to have good cohesion to prevent bleeding and segregation.
Hydroxypropyl methylcellulose ether 400 viscosity is white powder, the solvent performance in cold water and hot water is different, high methoxy content products are insoluble in hot water above 85 ℃, and medium methoxy content products are insoluble in hot water above 65 ℃ Hot water, products with low methoxyl content are insoluble in hot water above 60°C. Ordinary HPMC is insoluble in organic solvents such as ethanol, ether and chloroform, but is soluble in 10%~80% ethanol aqueous solution or a mixture of methanol and dichloromethane. HPMC has certain hygroscopicity. At 25℃/80%RH, the equilibrium moisture absorption is 13%, and it is very stable in dry environment and PH 3.0~11.0 environment.
Low-viscosity hydroxypropyl methyl cellulose ether for self-leveling ground cement mortar is widely used in self-leveling. Self-leveling is a ground construction technology. Since the entire ground is leveled naturally with little intervention from the construction personnel, the flatness and construction speed are greatly improved compared with the previous manual leveling process. The self-leveling dry mixing time takes advantage of the excellent water retention of hydroxypropyl methylcellulose. Since self-leveling requires that the well-stirred mortar can be automatically leveled on the ground, the water material is relatively large. Add HPMC, and it will be controlled after pouring. The water retention of the surface makes the dry surface high in strength and small in shrinkage, which greatly reduces cracks.
The addition of HPMC also provides viscosity, acts as an anti-settling aid, enhances fluidity and pumpability, and improves the efficiency of paving. Semonova will provide you all detailed information about HPMC, MHEC, RDP and all kinds of cellulose ether. Welcome to consult us or leave us message.
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