HPMC manufacturer-Influencing factors of hydroxypropyl methylcellulose purity
In building thermal insulation mortar, the purity of hydroxypropyl methylcellulose directly affects the quality of construction, so what are the factors that affect the purity of hydroxypropyl methylcellulose? SLEOCHEM takes you to answer this question.
In the production process of hydroxypropyl methylcellulose, the residual oxygen in the reaction kettle leads to the degradation of hydroxypropyl methylcellulose and the decrease in molecular weight, but the residual oxygen is limited, and it is not difficult to reconnect the cracked molecules. 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 refuse to increase the content of hydroxypropyl, so the quality cannot reach the level of other similar products. The water retention rate of hydroxypropyl methylcellulose is closely related to hydroxypropyl, but it also determines its water retention rate, the effect of alkalizing, the proportion of methyl chloride and propylene oxide for the entire reaction process , The concentration of alkali and the ratio of water to refined cotton all determine the performance of the product.
quality of material. alkalizing effect. The process ratio and the ratio of the solvent are used to neutralize the effect. Some hydroxypropyl methylcellulose is made and dissolved, and it is very turbid like adding milk. Some are milky white, some are yellow, and some are clear and transparent. If you want to deal with it, adjust from the above points. Sometimes acetic acid can seriously affect the light transmittance. It is best to use acetic acid after dilution. The biggest impact is whether the mixing of the reaction is uniform, and whether the system ratio is stable (some materials have unstable moisture content, such as recycling the applied solvent). Many factors are at play. If the equipment is stable and the operators are well trained, the production should be very stable. The light transmittance will not exceed the range of ±2%, and the substitution uniformity of the substitution group should be well controlled. Instead of uniform, the transmittance must be just fine.