Propylene sales, Wei Connaught Chemical (certified), propylene glycol jiangdu provided by Qingdao Wei Connaught Chemical Co. Qingdao Wei Connaught Chemical Co. (www.qdweinuo.com) is specialized in the "phenol, aniline, ethylene, n-butanol, isobutanol, n-propanol, isopropanol, methanol," the business, the company adhering to the "integrity management, service intentions, "the idea, to provide you with the highest quality products and services. Welcome to inquire! Contact: Feng Zhongying. The domestic market supply and demand: As of December 2010, the domestic production capacity of 328,000 tons of propylene glycol. Which propylene oxide hydrolysis capacity of 60,000 tons / year, transesterification method was 20.8 million tons per year, bio-chemical method for the 60,000 tons per year. Domestic propylene glycol / dimethyl carbonate unit is still some advantages in production cost manufacturers, while domestic dimethyl carbonate / propylene glycol cogeneration plant capacity, production increased significantly in recent years, making the self-sufficiency rate of propylene glycol is greatly improved, domestic enterprises to actively go exit road glycol, propylene glycol, from 2000 to 2004 export growth is relatively stable from 2004 to 2009 showed a rapid growth momentum. 2005 export volume of 1.2 tons. 2010 exports amounted to 37,000 tons more than in 2005 three times glycol: chemical properties of unsaturated polyester editor is a versatile group of linear polymers, polyester chain has its skeleton key on the main chain and unsaturated double bonds, but at both ends of the macromolecular chains each having a carboxyl group and a hydroxyl group. The double bond on the main chain and a vinyl monomer may be copolymerized crosslinking reaction, the unsaturated polyester resin from insoluble into soluble, fusible state, infusible state. Main chain ester bond hydrolysis reaction can occur, the acid or base may accelerate the reaction. If the styrene copolymer after crosslinking, can greatly reduce the occurrence of the hydrolysis reaction. In acidic medium, the hydrolysis is reversible glycol sales, incomplete, therefore, the erosion resistant polyester acidic medium; in alkaline medium, by forming a resonance stabilized carboxylate anions, hydrolysis becomes irreversible, so polyester alkali resistance is poor. Carboxy-terminus may be polyester chain and the alkaline earth metal oxide or hydroxide [e.g. MgO production propylene glycol, CaO, Ca (OH) 2, etc.] the reaction, the unsaturated polyester molecular chain extension, may eventually form a complex . Molecular chain extenders make initial viscosity of 0.1 ~ 1.0Pa · s viscosity liquid resin supply glycol, in a short time the viscosity rising to 103Pa · s or more, until it becomes similar to the gel-like substance can not flow, tack . When the resin is in the state not crosslinked, in a suitable solvent still soluble, has good flowability when heated.