Factors affecting the purity of HPMC

The purity of HPMC in building thermal insulation mortar and putty powder of internal and external walls directly affects the guarantee of construction quality. What are the factors influencing the purity of HPMC? Shandong chuangyao biotechnology will answer this question.

In the production process of hydroxypropyl methylcellulose, the residual oxygen in the reactor leads to the degradation of hydroxypropyl methyl cellulose, and the molecular weight is reduced. However, the residual oxygen is limited, so long as the broken molecules are re connected, it is not very difficult. However, the water saturation rate is also closely related to the content of hydroxypropyl group. Some factories only want to reduce the cost and price, rather than increase the content of hydroxypropyl, so the quality can not reach the level of similar products abroad. The water retention rate of hydroxypropyl methylcellulose is closely related to hydroxypropyl group, but it also determines its water retention rate for the whole reaction process. The properties of the product are determined by the alkalization effect, the ratio of chloromethane to propylene oxide, the concentration of alkali and the ratio of water to refined cotton.

Quality of raw materials. The effect of alkalization. Some hydroxypropyl methyl cellulose is as cloudy as milk after being dissolved. Some are milky white, some are yellow and some are clear and transparent. If you want to solve the problem, adjust it from the above points. Sometimes acetic acid can seriously affect the light transmittance. It is best to use acetic acid after dilution. The most important factor is whether the reaction is stirred evenly, and whether the system ratio is stable (some materials have unstable moisture content, such as the solvent used for recycling). In fact, many factors are affecting it. If the equipment is stable and the operators are well trained, the production should be stable. The light transmittance will not exceed ± 2%, and the substitution uniformity of substituents should be well controlled. Instead of uniformity, the light transmittance will be better.

For more information, please pay attention to Shandong chuangyao Biotechnology Co., Ltd www.cyhuagong.com