Manufacturing process of HEMC hydroxyethyl methylcellulose

Hydroxyethylmethylcellulose acts as a colloidal protectant, emulsifier and dispersant due to the surface activity in aqueous solutions. Outcome of hydroxyethyl methylcellulose on cement properties. Hydroxyethylmethylcellulose is undoubtedly an odorless, bland, non-poisonous white powder that dissolves in cold h2o to make a obvious viscous remedy. It provides the capabilities of thickening, adhesion, dispersion, emulsification, movie formation, suspensions, adsorption, gelling, surface area action, normal water maintenance and colloid safety. Aqueous remedies are area productive and functions as colloidal protectants, emulsifiers and dispersants. Hydroxyethylmethylcellulose aqueous answer has very good hydrophilicity which is a competent normal water-preserving representative. HEMC generation procedure The innovation discloses a preparation method of hydroxyethyl methyl cellulose using highly processed pure cotton as unprocessed substance and using ethylene oxide as the etherifying broker to prepare hydroxyethyl methyl cellulose. The raw supplies utilized for planning of hydroxyethyl methylcellulose are respectively by body weight: 700 to 800 aspects of toluene and isopropyl alcoholic drinks mixture as solvent, 30 to 40 aspects of drinking water 7080 parts of sodium hydroxide, 8085 areas of fine natural cotton, epoxy 20-28 aspects of ethane, 80-90 parts of methane chloride, 16-19 areas of glacial acetic acid the particular methods are as follows. The first step would be to add more an assortment of toluene and isopropyl alcoholic drinks, normal water and sodium hydroxide on the response pot, and also heat to 60 ~80℃, maintain hot for 2040 moments the second phase, alkalization: great the material to 3050C, squirt the merged solvent of natural cotton, toluene and isopropyl alcohol, vacuum to .006mpa, fill up with nitrogen for three times, swap the alkaline, alkali Situations of alkalization: alkalization time is two hours, alkalization temp is 30C-50C next phase etherification: right after alkalization, vacuum the reactor to .05-.07mpa, add ethylene oxide and methyl chloride 30- 50 moments. The first point of etherification: 4060C, 1.02. h, pressure is handled involving .150 ~ .3mpa the 2nd period of etherification: 60-90℃, 2.-2.5 hours, pressure is managed involving .4 - -.8 mpa the fourth period Stage, neutralization: Include the assessed glacial acetic acid solution in the desolvation reactor in advance, click inside the etherified substance for neutralization, temperature it up to 75-80C for desolvation, heating it to 102C, and detect PH 6 or 8 to accomplish the dissolution The dealt with plain tap water in the turn back osmosis installment at 90℃-100℃ is included with the desolventizing pot the 5th phase is centrifugal laundry: the fourth move would be to centrifuge the material through a horizontal spiral centrifuge, and the separated materials is transferred to the pre- Materials are washed in a laundry kettle filled up with warm water the 6th phase is centrifugal drying out: the washed materials are transported on the dryer by way of a side to side spiral centrifuge, along with the resources are dehydrated at 150~170°C. The dried up materials is crushed and packaged. Compared to existing cellulose ether generation technological innovation, the trademarked technological innovation of the present invention employs ethylene oxide as being the etherifying agent to get ready hydroxyethyl methylcellulose. The hydroxyethyl methylcellulose contains hydroxyethyl groups and can They have good mildew and mold level of resistance, adhesive steadiness and mildew and mold amount of resistance when saved. Can be used rather than other cellulose ethers.