1. Viscosity Control
High-viscosity hydroxypropyl methylcellulose cannot produce very high cellulose only by vacuuming and replacing with nitrogen. However, if a trace oxygen measuring instrument can be installed in the kettle, the production of viscosity can be controlled artificially.
2. Use of associative agents
In addition, considering the replacement speed of nitrogen, and at the same time, the air tightness of the system is very good, and it is very easy to produce high-viscosity products. Of course the degree of polymerization of the refined cotton is also crucial. If it still doesn’t work, the hydrophobic association method is used, and what kind of associative agent is selected has a great influence on the performance of the final product.
3. Hydroxypropyl content
The residual oxygen in the reaction kettle causes the cellulose to degrade and the molecular weight is reduced, but the residual oxygen is limited. As long as the broken molecules are reconnected, it is not difficult to make high viscosity. However, the water saturation rate is also closely related to the content of hydroxypropyl,Some factories only want to reduce the cost and price, and are unwilling to increase the content of hydroxypropyl, so the quality cannot reach the level of similar products.
4. Other factors
The water retention rate of the product has a great relationship with hydroxypropyl, but for the entire 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 water. The ratio with refined cotton determines the performance of the product.
Post time: Apr-25-2024