Propylene glycol: production methods to edit because of different varieties, but basically include condensation and mixing steps. Condensation methods are: ① melt polycondensation. Acid and alcohol direct melt polycondensation, without adding other ingredients. The use of alcohol, water boiling range difference, so that the water of reaction is separated by the separation column. This method is simple equipment glycol polyester resin, short production cycle, widely used. ② solvent azeotropic dehydration. Add toluene or xylene (solvent) in the polycondensation process, the use of toluene and water azeotropic point lower than the boiling point of water, the water of reaction out quickly, promoting polycondensation reaction. The advantage is that the reaction method is relatively stable, easy to grasp, the product color is better, but requires a watershed reflux device, use toluene reaction, condensation section to be explosion-proof. ③ decompression. Shrinkage in the volume of condensation 2/3 3/4, evacuated to meet the requirements until the acid value. ④ pressure method. Pressure can accelerate the reaction, shortening the reaction cycle, to increase productivity. Blended mix and wet premixed intervention points. Intervention is to mix the reactive solid prepolymer, the solid-state cross-linking agent, glass fiber, catalyst, pigment mixed into a molded plastic; wet premixed with styrene as the crosslinking agent, the liquid unsaturated polyester, glass fibers, catalysts, lubricants, pigments, etc., after mixing kneader propylene glycol solvent, made of polyester dough molding compound. Chinese name: 1,2-propanediol; 1,2-dihydroxy propane; propylene glycol; α- propylene glycol a price, 2-propanediol [1] English name: 1,2-Propanediol; 1-propanediol, 2-Dihydroxypropane; propanediol The viscosity and moisture absorption, and non-toxic, so often used as a manufacturing various types of ointments, salves solvents, softeners and excipients. In the food industry, propylene glycol esters of fatty acids and fatty acid esters produced by the reaction of propylene glycol, mainly for food emulsifier; also a good solvent seasoning and coloring. Propylene glycol with various spices have good mutual solubility, and thus the solvent and the softening agent for cosmetics and the like. Tobacco is also used as wetting agents, preservatives, food processing equipment, lubricants and food marking ink solvents. Aqueous propylene glycol is propylene glycol antifreeze effective polyester resin, propylene glycol, Wei Wei Connaught Chemical provided by Qingdao Sino Chemical Co. Qingdao Wei Connaught Chemical Co. (www.qdweinuo.com) strong, credible, in Qingdao, Shandong and other chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Wei Connaught Chemical and you hand into the brilliant, for a better future!