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HPMC Influencing Factors
Sep 28, 2017

HPMC Influencing factors

Factors Affecting the Viscosity and Transmittance of Hydroxypropylmethyl Cellulose

The impact of hydroxypropyl methyl cellulose transmittance is mainly the following:

First, the quality of raw materials.

Second, the effect of alkalization.

Third, the process ratio

Fourth, the solvent ratio

Fifth, the effect of neutral

Some products to do after the dissolution of the same as the addition of milk is very cloudy, some milky, and some are yellow, and some are clear and transparent ... ... to solve the following points from the adjustment. Sometimes acetic acid can seriously affect the light transmittance, acetic acid is best diluted with the impact of the maximum reaction or whether the reaction is uniform, the system ratio is stable (some material moisture, the content of instability, such as recovery of the application of the solvent), in fact, many Factors in the impact. Equipment stability, coupled with the training of skilled operators, then the production should be very stable. Light transmittance does not exceed ± 2% range, to control the substitution of substituents uniformity. Replace the uniform, light transmission certainly fine.

Factors Affecting the Viscosity of Hydroxypropylmethyl Cellulose

High viscosity hydroxypropylmethylcellulose is produced only by vacuuming and replacing with nitrogen to produce a high level of cellulose. Generally in the domestic production of high viscosity cellulose can not be controlled. However, if the installation of a trace of oxygen in the kettle can measure the production of its viscosity can be artificially controlled. Also in the nitrogen replacement rate to consider the next, while the system air tightness no matter how good the production of high viscosity products is a very easy thing. Of course, the degree of polymerization of refined cotton is also crucial. If it is not enough to use hydrophobic association to do it There are in this area of the associated agent. The choice of what kind of associative agent on the use of the final product performance is a great impact. The residual oxygen in the reactor leads to cellulose degradation, molecular weight reduction, but the residual oxygen is limited, as long as the broken molecules to re-connected, do high viscosity is not difficult. But the saturation rate and the content of hydroxypropyl also has a great relationship, some plants only want to reduce costs and prices, do not want to improve the content of hydroxypropyl, so the quality of similar products abroad level. Product water retention rate and hydroxypropyl has a great relationship, but for the entire reaction process also determines its water retention rate, the effect of alkalization, the proportion of methyl chloride and propylene oxide, alkali concentration and water The ratio of refined cotton determines the performance of the product.