mortar additive hpmcMay 11th 2023
Today SLEOCHEM will share you three reasons to affect light transmission of HPMC. If you have any suggestions, please be free to share with us.
1. The residual oxygen in the reactor leads to the degradation of cellulose ether and the decrease of molecular weight, but the residual oxygen is limited. It is not difficult to make high viscosity as long as the broken molecules are reconnected. However, the water saturation rate is similar to that of hydroxypropyl. The content also has a great relationship. Some manufacturers just want to reduce the cost and price, and are unwilling to increase the content of hydroxypropyl, so the quality cannot reach the level of other similar products.
2. The water retention rate of the product has a great relationship with hydroxypropyl, but for the whole reaction process, it also determines its water retention rate, the effect of alkalization, the ratio of methyl chloride and propylene oxide, the concentration of alkali and The ratio of water to refined cotton both determines the performance of the product. Water retention is also closely related to viscosity. We all know that methyl cellulose does not have hydroxypropyl, but its water retention is not low. The key is the ratio, the ratio must be reasonable, and all angles must be considered, so that the product can be good, even if the cost is high, if the ratio is not appropriate, the performance is not very good.
3. High-viscosity hydroxypropyl methylcellulose HPMC cannot produce high-quality cellulose only by vacuuming and replacing with nitrogen. Generally, the production of high-viscosity cellulose in China cannot be controlled. However, if a trace oxygen measuring instrument can be installed in the kettle, the production of its viscosity can be controlled artificially. In addition, consider the replacement speed of nitrogen, and at the same time, the system has good air tightness, and it is very easy to produce high-viscosity products. Of course the degree of polymerization of the refined cotton is also crucial. If that doesn’t work, do it by hydrophobic association. There are domestic associative agents in this regard. What kind of associative agent is selected has a great influence on the performance of the final product.