About putty powder easy to powder of the problem, or the strength can not reach what. All know that the putty powder need to add cellulose ether, many users do not redispersible emulsion powder. Many people in order to save costs, without rubber powder, but this is why ordinary putty easy to powder, easy to appear product quality problems key! Ordinary putty (e.g. 821 putty) is mainly composed of chalk, add a little starch adhesive and CMC (carboxymethyl cellulose) made of methyl cellulose is also used with SF powder putty, such no adhesion, water resistance.....

Ⅰ,What are the two main classes of common cellulose ethers? 1) non-ionic, such as HPMC, cellulose, etc. 2) ionic type, such as CMC cellulose Ⅱ,The difference between two HPMC cellulose and CMC cellulose 1) The price of HPMC cellulose is higher, and the price of CMC cellulose is lower 2) HPMC without any material adverse reaction of cellulose CMC cellulose, because the production of residual acidic substances, used together with ash and cement were not calcium alkaline products lose viscosity, stability failure of.Cmc was affected by pH, can be used for gypsum based sand, can not be used for cement mortar. In high alkaline that will lose viscosity. 3) HPMC cellulose must use refined cotton production, CMC in addition to the use of refined cotton production, can also use the waste cloth, waste and other production, it is also one of the reasons why the market price difference. 4) CMC cellulose moisture absorption is larger, general conditions storage will contain larger moisture, HPMC cellulose water absorption is much smaller 5) CMC cellulose has a retarding effect on gypsum based mortar and reduces its strength ....

I. simple method for distinguishing the quality of hydroxypropyl methylcellulose HPMC: (1) first look at the whiteness of hydroxypropyl methyl cellulose, the appearance of color is white, uniform color, there is no more black spots under the microscope; poor color slants gray, black spots more. Look at the shape and liquidity of the particles, the cotton as the starting material for the use of long strip, poor mobility, the use of lignocellulose as the starting material of the particles near the cube, good liquidity. (2) followed by fineness and particle size distribution, the best size of hydroxypropyl methylcellulose is homogeneous, small particle size, granular and liquid; the opposite is not good. Hydroxypropyl methyl cellulose fineness generally has 80 eyes and 100 mesh, 120 less purpose, Hebei produces hydroxypropyl methyl cellulose mostly 80 mesh, the finer the fineness, in general, the better. (3) transmittance: the hydroxypropyl methyl cellulose HPMC into the water, forming transparent colloid, to see its transmittance, transmittance of the greater the better, indicating that less insoluble substances. The vertical reactor generally has good transmittance, but the horizontal reactor is a little worse, but it can not be explained that the quality of the kettle is better than that of the still kettle, and the quality of the product is determined by many factors. (4) proportion: the heavier the proportion, the heavier the better. Than in general, usually because of the high content of hydroxypropyl, hydroxypropyl content is high, then water conservation is better.....

保温砂浆中为什么需要添加一点量的羟丙基甲基纤维素，这是因为保温砂浆需要一定的保水作用. 羟丙基甲基纤维素的保水作用主要是为了保证砂浆中的水泥在硬化前,有充足的水分水化,不会因为失水过快,导致水泥没有得到足够的水分进行固化反应. 只有水泥水化反应完全,才能保证保温砂浆本身的强度和与基层材料的粘结强度.按照实验理论来看,水泥完全水....

In many high-rise building exterior wall construction, often waterproof mortar layer cracks, cracks, hollowing, shedding and other quality problems caused by improper operation. Among many problems, leakage of exterior wall is one of the most urgent problems in building construction. A variety of new wall materials (such as concrete hollow brick, aerated concrete block) is widely used, but new wall materials are common anti permeability ability is poor, so we must take effective measures to prevent the building wall leakage. The following points are easy to overlook in the construction of waterproof mortar:....