hpmc chemical price in pakistan-How to choose the right hydroxypropyl methylcellulose for the production of putty powder
Hydroxypropyl methyl cellulose HPMC is mainly used to thicken, retain water and improve construction. The main performance of hydroxypropyl methyl vitamin is related to hydroxypropyl content and methoxy content, so we have to distinguish it in the market The quality of cellulose is good or bad, avoid using bad products.
1. According to the model: According to the different formulas of various putties, the viscosity models of hydroxypropyl methyl cellulose and methyl cellulose are different, ranging from 40,000 to 100,000 are used, and the fiber should be proposed. Plain ether can not replace the role of other binders, adding cellulose ether can not mean that the ingredients of other binders can be reduced.
2. Do you need cold water dispersible cellulose ether: Cellulose ether (including hydroxypropyl methyl cellulose and methyl cellulose) is a kind of surfactant, which has a large viscosity after dissolution. It is the reason for this property. If ordinary cellulose ether is added to water, it will easily form a cluster. The outside of the cluster has been dissolved into a very thick solution. If the inside is wrapped, it is difficult for water to penetrate, resulting in poor dissolution. . The surface-treated cellulose ether (which can delay the dissolution) will not be so, and it can be well dispersed in cold water (delay the dissolution, and gradually dissolve after the dispersion is good). It is a good choice to understand the above differences.