Hydroxypropyl methyl cellulose (HPMC) is a natural polymer cellulose as raw material, through a series of chemical processing to obtain a non-ionic cellulose ether. Hydroxypropyl methylcellulose (HPMC) is an odorless, tasteless, non-toxic white powder, soluble in cold water, forming a transparent viscous solution. As a thickener, binder, dispersion, emulsion, film, suspension, adsorption, gel, a surfactant, and protective colloid to maintain moisture and other properties. II. In the Building Materials Applications 1. mortar plastering mortar high water retention can fully hydrated cement. Significantly increase the bond strength. At the same time may be appropriate to improve the anti-thrust and shear strength. Greatly improved construction effect, improve work efficiency. 2. Water putty putty cellulose ether in the main role is water retention, adhesion and lubrication, avoid excessive water loss may cause cracks or powder from the phenomenon, while increasing the adhesion of putty, reducing construction sagging, so the construction is relatively smooth, and effort. 3. The main use as a thickening agent interface can improve the tensile strength and shear strength, improve surface coating to enhance adhesion and bond strength. 4. Exterior insulation mortar cellulose ether in this focus from the bonding material to increase the role of strength mortar coating easier, improve work efficiency, but also has anti-hanging capability, high water retention time may be extended by the mortar work improve resistance to shrinkage and crack resistance, improved surface quality, improve the bond strength. 5. Tile adhesive high water retention may not have to pre-soak or wet tile and substrate, significantly improved its bond strength, the slurry can be long construction period, fine, uniform, easy construction, but also has good anti-slip sex. 6. Every agent ditch fill cellulose ether is added every agent it has a good edge adhesion, low shrinkage and high abrasion resistance, protecting the base material from mechanical damage, avoid water penetration to bring the whole building negative impact. 7. Self-leveling material cellulose ethers stable viscosity to ensure a good flowability and self-leveling ability, water retentivity enable it to control the rapid solidification, reducing cracking and shrinkage. What hydroxypropyl methyl cellulose (HPMC) The main purpose is? HPMC is widely used in building materials, paints, synthetic resins, ceramics, pharmaceuticals, food, textile, agriculture, cosmetics, tobacco and other industries. HPMC-use can be divided into: Construction grade, food grade and pharmaceutical grade. Most of the current domestic construction stage in the construction stage, a large amount of putty powder, about 90% is used to make putty powder, and the rest is used as cement and glue. Hydroxypropyl methyl cellulose (HPMC) dissolution methods are those that: (1) Whiteness: Whiteness Although HPMC can not decide whether or not to use, and if it is added in the production process brighteners, will affect its quality. However, a good product mostly good whiteness. (2) fineness: fineness HPMC is generally 80 mesh and 100 mesh, 120 mesh less, Hebei Province, HPMC most 80 mesh, the finer the fineness, more generally, the better. (3) Transmittance: After the hydroxypropyl methylcellulose (HPMC) into the water, to form a transparent colloid, see the transmittance, the better the larger the transmittance, described inside insolubles less . Vertical reactor transparency in general are good, horizontal reactor to be satisfactory, but can not explain the quality of legislation produced kettle kettle on producing better than lying, there are many factors that determine the quality of products. (4) Specific gravity: the proportion of the larger, heavier is better. Than the major, generally because there hydroxypropyl content, high hydroxypropyl content, the water retention is better hydroxypropyl methyl cellulose (HPMC) putty powder volume in the amount of HPMC in the practical application of, climate ambient temperature, local gray calcium quality putty powder formulations and "quality customers demand," the different, and mixed. General is between 4 kg -5 kg. For example: Beijing's putty powder, mostly put 5 kg; Guizhou mostly summer 5 kg, 4.5 kg in winter; Yunnan heavy volume small, generally three kilograms -4 kg more. Hydroxypropyl methylcellulose (HPMC) preferably a viscosity much? Putty powder is generally one hundred thousand on it, mortar in higher requirements, to go with a hundred and fifty thousand. And, the most important role HPMC is water retention, followed by thickening. In putty powder, as long as water retention, low viscosity of these (7-8 million), is also possible, of course, the viscosity of bigger, relative water retention is better when the viscosity is more than 100,000, the impact on the viscosity of water retention insignificant. HPMC used in putty powder, mainly what role, if chemical happen? HPMC powder putty in, from thickening, water and construction of three roles. Thickening: Cellulose can play thicken suspension, keeping the solution up and down the same uniform, anti-sagging. Water retention: make putty powder dry slower, secondary ash calcium reaction under the action of water. Construction: Cellulose have lubrication allows putty powder has good workability. HPMC does not participate in any chemical reaction, only play a supporting role. Putty powder, add water, on the wall, is a chemical reaction, because there is to generate new material, put on the wall to get down from the wall putty powder, ground into powder, then, we would not, as has been the formation of new substances (calcium carbonate ) a. The main ingredient is sierozem: 2, CaO mixture of Ca (OH) and a small amount of CaCO3, CaO + H2O = Ca (OH) 2 -Ca (OH) 2 + CO2 = CaCO3 ↓ + H2O ash calcium in water and air Under the effect of CO2, produce calcium carbonate, and water retention HPMC only auxiliary ash calcium better response, which itself did not participate in any reaction. HPMC relationship between viscosity and temperature, the actual application should pay attention to what? HPMC viscosity inversely proportional to temperature, that is, the viscosity of which increases with decreasing temperature. We usually say a product viscosity, mean, at a temperature of 20 degrees Celsius, the result of detection of 2% aqueous solution thereof. In practice, the temperature difference between summer and winter areas, it should be noted, is recommended in the winter time with relatively lower viscosity, so that is more conducive to the construction. Otherwise, the temperature is low, will increase the viscosity of the cellulose, Scraping, when will feel heavy. The viscosity: 75000-100000 mainly used putty reasons: good water retention of high viscosity: 150000-200000 mainly used for mortar powder particles of polystyrene insulation material and glass beads of insulation mortar reasons: high viscosity, easy to swap mortar will, sagging, improved construction.