Hydroxypropyl methyl cellulose (HPMC) :
Hydroxypropyl methylcellulose (HPMC) is an odorless, tasteless, non-toxic white powder, there are two kinds of instant hydroxypropyl methylcellulose and slow-soluble hydroxypropyl methylcellulose, instant hydroxypropyl methylcellulose, quickly dispersed in cold water, disappearing in the water, at this time the liquid has no viscosity, about 2 minutes, the viscosity of the liquid becomes large, forming a transparent viscous colloid.
Slow-soluble type: can only be used in dry powder products such as putty powder and cement mortar, in liquid glue and paint, can not be used, there will be clumping phenomenon.
Physicochemical property
1, appearance: white or white powder, no smell and tasteless.
2, granularity: 100 mesh pass rate is greater than 98.5%;
The passing rate of 80 items is greater than 100%.
3, carbonization temperature: 280-300℃.
4, apparent density: 0.25-0.70g/(usually about 0.5g/), specific gravity 1.26-1.31.
5, color change temperature: 190-200℃.
6. Surface tension: 20% aqueous solution is 42-56dyn/cm.
7, solubility: soluble in water and some organic solvents, such as the appropriate proportion of ethanol/water, propanol/water, dichloroethane, etc.The aqueous solution has surface activity, high transparency and stable performance.Different specifications of the product gel temperature is different, this is the thermal gel properties of HPMC.The solubility changes with the viscosity, the lower the viscosity, the larger the solubility, the performance of different specifications of HPMC has a certain difference, the dissolution of hydroxypropyl methyl cellulose HPMC in water is not affected by PH value.
8 、 Hydroxypropyl methylcilianol HPMC decreased with the decrease of methoxy content, the increase of gel point, the decrease of water solubility and the decrease of surface activity.
9, HPMC also has thickening ability, salt, low ash content, PH stability, water preserving capability, size stability, excellent film-forming ability and a wide range of enzyme resistance, dispersion and adhesion characteristics.
Hydroxypropyl methyl cellulose (HPMC)
· It can thicken the fresh mortar to have a certain wet viscosity and prevent segregation. (thickening)
· Water preserving capability is also the main characteristic, which helps to maintain the amount of free water in the mortar, thus allowing more time for the cementitious material to hydrate after mortar construction. (Water preserving capability). It has air entrainment property, can introduce even fine air bubble, improve mortar workability.
Packing
China
