Select proper hydroxypropyl methylcellulose for putty powder and thermal insulation mortar

What kind of hydroxypropyl methylcellulose is most suitable for putty powder and thermal insulation mortar? Today we will discuss it together.

First of all, let's look at the main components of putty powder and thermal insulation mortar for internal and external walls, including masterbatch (small material), aggregate, filler and additive. Masterbatch mainly includes redispersible latex powder, hydroxypropyl methylcellulose, lignin or polypropylene fiber. Additive refers to brightener, whitening agent, early strength agent and water reducer. Aggregate generally refers to cement, gray calcium, gypsum powder, etc. At present, there are many domestic manufacturers of putty powder and thermal insulation mortar. According to the different regional environment, the formula also has differences, and the requirements for hydroxypropyl methylcellulose also have great differences. The following is some experience shared by chuangyao Biotechnology Co., Ltd.

Hydroxypropyl methylcellulose can be divided into instant solution, slow solution, 100000 viscosity, 150000 viscosity and 200000 viscosity according to different physical and chemical properties and post-treatment methods. According to different uses, hydroxypropyl methylcellulose can be divided into construction industrial grade, daily chemical grade and food grade, including domestic and imported ones. MC, HPMC and CMC are commonly used in producing dry mixed powder materials, and low viscosity and medium viscosity can be obtained from viscosity Cellulose with different viscosity has different uses. The "Suo" carboxymethyl cellulose (CMC) and carboxymethyl starch sodium (CMS) are cheap and can be used in the putty powder at the low end of the inner wall. Their thickening and water holding effect is poor and can increase the leveling property. But it can not be used in waterproof putty and external insulation dry mixture. Because the cellulose reacts with cement and lime powder. Most users don't know much about hydroxypropyl methyl fiber and other cellulose. Many of them have heard that they don't really know about it. It is wrong to think that cellulose generally has certain alkalinity, cement and lime powder are also alkalinity, and that they can be used at will. In fact, it is wrong because flake alkalinity is indeed added in the production process, but the alkalinity of regular manufacturers is infinitely close to zero after many times of washing. Therefore, when you buy it, you can understand the sewage treatment situation of their company Is this company a real manufacturer or a qualified product. CMC and CMS are not single elements. The chloroacetic acid they use in the production process is acidic. The residual substances in the production process of cellulose react with cement and lime powder, so they can not be combined. Many manufacturers suffer great losses, which should be paid attention to.

Hydroxypropyl methylcellulose has stable chemical properties, good mildew resistance, water retention and thickening effect. When producing putty powder in thermal insulation mortar, it can be used from 100000 to 200000. But in production, it is not that the higher the viscosity is, the better, because the viscosity is inversely proportional to the bond strength. The higher the viscosity is, the smaller the strength is. At the same time, water retention does not mean that the higher the viscosity is, the higher the water retention will be. Generally, the viscosity is between 100000 and 150000, so it is more suitable to produce putty powder external insulation dry mixed mortar, except for some special formulas. Because its main role is to increase the leveling, construction, can reduce the amount of cement. Another function is that the cement mortar has a solidification period, which needs curing and water supply to keep it moist.

Therefore, in the production process of putty powder and thermal insulation mortar, we should pay attention to the above points. At the same time, in the general pursuit of environmental protection and green life today, high-quality hydroxypropyl methylcellulose should be pursued by the majority of manufacturers, rather than blindly pursuing the price.