How is the purity of hydroxypropyl methylcellulose affected?
How is the purity of hydroxypropyl methylcellulose affected? The purity of hydroxypropyl methylcellulose in inorganic thermal insulation mortar and interior wall putty powder in engineering buildings can directly harm the quality of construction, so what are the factors that endanger the purity of hydroxypropyl methylcellulose? Let us explain this to you today. In the production process of hydroxypropyl methylcellulose, the residual CO2 in the reaction tank will cause the dissolution of hydroxypropyl methylcellulose and reduce the relative molecular weight, but the residual O2 is limited, and only the broken molecular structure needs to be removed. It is not difficult to connect again. The primary water saturation rate of hydroxypropyl methylcellulose is closely related to the content of hydroxypropyl. Some factories only want to control the cost and price, and refuse to increase the content of hydroxypropyl, so the quality cannot reach similar foreign products. level.
The water retention rate of hydroxypropyl methylcellulose is also closely related to hydroxypropyl group, and hydroxypropyl group also determines the water retention rate of hydroxypropyl methylcellulose for the whole process of reflection. The actual effect of deliming, the proportion of methyl chloride and propylene oxide, the content of alkali and the ratio of water to refined cotton all determine the characteristics of the enterprise’s products.
The quality of raw materials, the actual effect of deashing, the preparation and manipulation of processing technology, the preparation and combination of organic solvents all determine the quality of hydroxypropyl methyl cellulose, and some hydroxypropyl methyl cellulose is made After melting, it is very cloudy 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 aspects. Sometimes glacial acetic acid can seriously damage the light transmittance. Glacial hydroxypropyl methylcellulose acetate should be used after dissolving, whether the harm is greater or the mixing is symmetrical, and whether the management system is stable (some materials are watery) In fact, many elements are harmful. With the reliability of the machine and the practical operation of the trained staff, the manufactured goods should be very stable. The light transmittance is not easy to exceed the range of ±2%, and the substitution symmetry of the substitute compound should be adjusted well. Instead of symmetry, transmittance is no doubt just fine.
Therefore, good product quality is affected by raw materials, production process, and many other factors. Only through strict control from beginning to end can products with stable quality be produced.