How to choose the appropriate hydroxypropyl methylcellulose for the internal and external wall putty

1.According to the model: according to the formula of various putty. Need hydroxypropyl methyl cellulose and methyl cellulose viscosity model is different, from 40000 to 100000 are. At the same time to put forward is the cellulose ether cannot replace the role of other adhesives. Add cellulose ether can not say not that can reduce other adhesive ingredients. HPMC

2. Whether to need cold water dispersed cellulose ether. Cellulose ether (including hydroxypropyl methyl cellulose and methyl cellulose) is a surfactant, with large viscosity after dissolution. It is the reason for this nature, if the ordinary cellulose ether into the water, easy to group. The outside of the group has dissolved into a very thick solution, the inside. The water is difficult to penetrate into, resulting in bad dissolution. After surface treated cellulose ether (can delay dissolution) will not do this. Can be well dispersed in cold water (delay dissolution,only gradually ), understand the above difference is a good choice.HPMC

Summing-up

1.For the internal and external wall putty of dry mixing. Because the cellulose ether has well in the material in the process of dry mixing. There will be no agglomeration phenomenon. Therefore, it is recommended to use ordinary models (non-cold water type), because the ordinary models dissolve faster than the cold water type. Shortening the waiting time from slurry mixing to construction. HPMC

2. For the cellulose ether (including hydroxypropyl methyl cellulose and methyl cellulose) directly dissolved in water. And then with other materials of the putty preparation, it is to use cold water cellulose ether. This surface cellulose ether can be well in cold water after dispersion (can delay dissolution)HPMC

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