Water retention of hydroxypropyl methyl cellulose

In the production of building materials, especially dry mixed mortar, hydroxypropyl methylcellulose plays an irreplaceable role, especially in the production of special mortar (modified mortar), which is an indispensable and essential part. The critical role of water-soluble hydroxypropyl methyl cellulose in mortar is mainly in three aspects: excellent water retention ability, the influence of mortar consistency and thixotropy, and the third is interaction with cement. The water-retaining effect of hydroxypropyl methylcellulose depends on the base's water absorption, the mortar's composition, the mortar, the artillery's thickness, the cannon's water requirement, and the setting time of the condensed material. The water retention of hydroxypropyl methylcellulose itself comes from the solubility and dehydration of hydroxypropyl methylcellulose itself. It is well known that cellulose molecular chains, although they contain many highly hydrating OH groups, are insoluble in water because cellulose structures are highly crystalline. The hydroxyl group's hydration capacity alone is insufficient to pay for the strong hydrogen bonds and van der Waals forces between molecules. Therefore, when substituents are introduced into molecular chains, they destroy not only hydrogen chains but also inter-chain hydrogen bonds due to the wedging of substituents between adjacent chains. The larger the substituents, the greater the distance between molecules. The more significant effect of hydrogen bond destruction is the solution enters after the expansion of the cellulose lattice, and hydroxypropyl methylcellulose becomes water-soluble, forming a high-viscosity solution. When the temperature rises, the hydration of the polymer is weakened, and the water between the chains is expelled. When the dewatering is sufficient, the molecules clump together, forming a three-dimensional network of gels. The factors that affect the water retention of mortar include the viscosity of hydroxypropyl methylcellulose, the amount of addition, the particle fineness and the use temperature. If you are looking for high quality, high purity and cost-effective Hydroxypropyl methylcellulose, or if you require the latest price of Hydroxypropyl methylcellulose, please feel free to email contact mis-asia.