The importance of hydroxypropyl methyl cellulose to mortar water retention
The importance of the mortar retention of hydroxypropyl methyl cellulose in the mortar is why it has high requirements for water retention. Hydroxypropyl methyl cellulose is a kind of non-ionic cellulose mixed ether. A semi-synthetic, inactive, viscoelastic polymer, often used in ophthalmology as a lubrication department, or as an excipient or excipient in oral medicine, it can be said that it is common in various kinds of commodities.
Mortar water retention refers to the ability of mortar to retain water. Mortars with poor water retention are easy to ooze blood during transportation and storage, that is, water floats on the top, and under the sand and cement tanks, they must be mixed first.
The mortar used for grass root construction has a certain water absorption rate. If the water-retaining mortar is poor, as long as the ready-mixed mortar is in contact with the block or substrate during the mortar application process, the ready-mixed mortar will absorb water, and the outer surface of the mortar will be exposed to the atmosphere Evaporation of water causes the mortar to lose water and lack of water, which affects the further hydration of the cement, and at the same time affects the normal development strength of the mortar, resulting in a low strength, especially the interface between the hardened body of the mortar and the strength, causing the mortar to crack and fall off .
Redispersible latex powders. Because redispersible latex powders have high bonding ability and unique properties, such as water resistance, construction and heat insulation, etc., their application range is extremely wide. Redispersible latex powder makes the material have excellent water-improvement, increase tensile strength and increase bending strength. The water-retaining mortar is effective, the cement hydrates more fully, the strength can develop normally, and the grass can be better bonded together.
The importance of hydroxypropyl methylcellulose for retaining the mortar is that the mortar is usually ground between the absorbent blocks or applied to the substrate in common, forming a whole with the matrix. The impact of mortar water retention effect on project quality.
Because the mortar loses too much water, it will affect the normal condensation of the mortar hardening and reduce the adhesion between the mortar and the surface. It is not only difficult to construct, but also reduces the strength of the masonry, thereby greatly reducing the quality of the project.
Therefore, if the mortar is not firmly bonded, the water is easily absorbed by the bricks, making the mortar too dry and thick, and the stains are uneven. During the construction process, not only the progress of the project is affected, but the wall is likely to be broken due to shrinkage. Conducive to construction, but also increased construction efforts.