Hydroxypropyl methyl cellulose (HPMC) is a non-ionic
cellulose ether made from natural polymer material - cellulose through a series of chemical processes. Hydroxypropyl methylcellulose (HPMC) is an odorless and tasteless self-coloring powder, which can be dissolved in cold water to form a transparent viscous solution, which has the functions of thickening, bonding, dispersing, emulsifying, film-forming, suspending, adsorbing, Gelling, surface activity, moisture retention and protective colloid properties.
Hydroxypropyl methylcellulose (HPMC) can be used in building materials, coatings, synthetic resins, ceramics, medicine, food, textiles, agriculture, cosmetics and tobacco industries
Hydroxypropyl methylcellulose is used as a raw material substrate to produce oil, which can realize the utilization of total sugar, improve the utilization rate of raw materials, reduce the residual amount of substrate in the fermentation broth, and reduce the cost of wastewater treatment. This hydroxypropyl methylcellulose The prime characteristic is conducive to the optimization of batch, fed-batch and continuous fermentation processes, avoiding a series of problems such as controlling the composition of the medium and dilution rate; it is also conducive to the regulation of the fermentation process.
Hydroxypropyl methylcellulose, the raw material cellulose, can be refined cotton or wood pulp. It is very necessary to crush it before alkalization or during the alkalization process. The crushing is to destroy the cellulose raw material by mechanical energy. In order to reduce the degree of crystallinity and degree of polymerization, increase its surface area, thereby improving the accessibility and chemical reaction ability of the reaction reagent to the three hydroxyl groups on the glucose ring group of the cellulose macromolecule.
Since the performance of hydroxypropyl methylcellulose is similar to other water-soluble ethers, it can be used in latex paint and water-soluble resin paint components as a film-forming agent, thickener, emulsifier and stabilizer, etc., so that the coating film has good properties. Abrasion resistance, leveling and adhesion, and improved surface tension, stability to acid and alkali, and compatibility to metallic pigments. Hydroxypropyl methylcellulose has a good effect as a thickener for white water-based polyvinyl acetate paint. The degree of substitution of cellulose ether is increased, and the resistance to bacterial erosion is also enhanced.
Although the etherification synthesis principle of hydroxypropyl methyl cellulose is not complicated, it needs to be alkalized, raw material pulverized, and alkalized. Each environment of etherification, solvent recovery, centrifugation, washing and drying involves a large number of key technologies and rich knowledge. For different types of products, each environment has the latest control conditions, such as temperature, time, pressure and material flow control. Auxiliary equipment and control instruments are favorable guarantees for stable product quality and reliable production systems.
