Send inquiry
Meigu purchases 650 curing agent BYK auxiliary agent recovery, see hereDoor-to-door purchase of all inventory chemical raw materials: dyes, pigments, coatings, paints, resins, aluminum and silver pastes, rubber, hot melt adhesives, pressure sensitive adhesives, BYK leveling agents, defoamers, dispersants, UV photoinitiators, ultraviolet rays Absorbent, light stabilizer, polyether polyol, lithium carbonate, lithium hydroxide, vanadium oxide, plastic embossing ink, oleic acid, AEO, printing paste, zinc borate, hydroxypropyl methylcellulose, isobenzene Diphenol, Hydroquinone, Polyoxyethylene Nonylphenol Ether, Polyethylene Glycol, Vinyl Resin, Flexible Foam Polyether, Combined Polyether, Pressure Sensitive Granular Hot Melt Adhesive, Recycled Menthol, Flavor, Vanillin , PVC polyvinyl chloride resin, recycled coconut oil lauric acid soap noodles, fumaric acid, chloroether resin, guaiacol, urotropine, zinc oxide, isocyanate MDI, TDI, white oil, glycerin, polyvinyl alcohol, Sodium alginate, etc., there are thousands of chemical names, as long as you handle it, I will buy it, and it will be recycled within 24 hours.
The production of diphenyl by the reaction of free amine and phosgene is a fully mature technical route. The reaction is to react aniline with formaldehyde, neutralize with alkali and distill to obtain didiamine MDA, dissolve didiamine or benzene, and carry out phosgenation reaction in the presence of an excess of 50% to 200% phosgene. Take the iso-ester, purify it by vacuum distillation, and remove the diphenyl solvent.