Low viscosity HPMC is widely used for self-leveling. Self-levelling is a very advanced construction technology. Due to the natural leveling of the entire floor with minimal interference from the construction personnel, the leveling and construction speed are greatly improved compared to the previous manual leveling process. In self-leveling, the dry-mixing time makes use of the excellent water retention capacity of hydroxypropyl methylcellulose. Since self-leveling requires a well-mixed mortar to be automatically leveled on the ground, the use of water-based materials is relatively large. Adding hydroxypropyl methylcellulose can control the water retention of the ground after pouring, water seepage is not obvious, and the dry ground has high strength and low shrinkage, thus greatly reducing cracks.
Advantages of HPMC
1、Hydroxypropyl methyl cellulose can provide viscosity and can be used as anti-settlement additive.
2、Hydroxypropyl methylcellulose can enhance the flowability and pumpability, thus improving the floor efficiency.
3、Hydroxypropylmethylcellulose can control water holding capacity, thus greatly reducing cracking and shrinkage.
As a self-leveling mortar, fluidity is one of the main indicators to evaluate the self-leveling performance. Under the premise of ensuring the rules of mortar composition, the fluidity of mortar can be adjusted by changing the content of fiber HPMC. However, too high content will reduce the fluidity of mortar, so the amount of cellulose ether should be controlled within a reasonable range.
Mortar water retention is an important indicator of the stability of the internal components of fresh cement mortar. In order to make the hydration reaction of the gel material fully carried out, the right amount of cellulose ether can keep the water in the mortar for a longer time. In general, the water retention of the slurry increases with the increase of cellulose ether content. The water retention of cellulose ether can prevent the substrate from absorbing too much water too quickly and hinder the water evaporation, thus ensuring that the slurry environment provides sufficient water for cement hydration. In addition, the viscosity of cellulose ether also has a significant effect on the water retention of mortar. The higher the viscosity, the better the water retention.
Cellulose ether has a slow setting effect on mortar. With the increase of cellulose ether content, the setting time of mortar is prolonged. The retarding effect of cellulose ether on cement slurry mainly depends on the degree of substitution of alkyl group, which is not much related to its molecular weight. The lower the degree of alkyl substitution, the higher the hydroxyl content, the more obvious the retarding effect. And the higher the content of cellulose ether, the more obvious the retarding effect of the composite film on the early hydration of cement. Therefore, the more significant the retarding effect is.
Self-levelling mortar can rely on self-weight to form a flat, smooth and solid base on the substrate for laying or bonding other materials, while allowing efficient construction over a large area. Generally self-leveling mortar requires good fluidity, but the fluidity of actual cement slurry is usually only 10-12 cm.Youngcel has HPMC for sale,contact us today if you want to buy them.
Youngcel HPMC/MHEC is widely used as Chemical Auxiliary Agent for Tile Adhesive,Cement Plaster, Dry mix mortar, Wall putty, Coating, Detergent and so on.And we can provide you lowest price and best quality.
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Post time: Aug-01-2022