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Abstract: This article introduces the production, synthesis, and application of a new type of environmentally friendly coating intermediate material - polycarbonate polyol, revealing its function in water-based industrial coatings. Introduced domestic enterprises or units that develop and produce materials, and emphasized and analyzed their future market demand, Keywords: polycarbonate polyols, aliphatic polycarbonate polyols; Catalysts; Coatings; intermediate Chinese Library Classification Number: 0632.5.TQ223.16 Reference Code: B Article number: 1004-227X (2012) 05-0075-03 Synthesis and performance characteristics of 1 polycarbonate polyol Polycarbonate polyols are a type of aliphatic polycarbonate polyols obtained by co polymerization of carbon dioxide and epoxy monomers. They were first synthesized by Yoshihiro Inoue and others in Japan in the late 1960s. According to the different catalysts used, different properties of polycarbonate polyols can be obtained, such as narrow molecular weight distribution, high molecular weight, and regular molecular chain structure polycarbonate polyols. Due to the low activity of carbon dioxide and its difficulty in activation, the efficiency of the catalyst used is generally low. Existing research work has mainly focused on the development of new polymerization catalysts. After years of development, significant progress has been made in related research. At the beginning, the catalytic efficiency of the diethyl zinc catalyst used by Inoue Xiangping in Japan was only a few to ten grams per gram of catalyst. In 1989, Chen Liban and others developed a metal catalyst with a catalytic efficiency of 40 g/g; In 1999, Wang Xianhong and others developed rare earth catalysts with an efficiency of 50-100 g/g: in 1999, M Ree Development Delivers Results Zinc glutarate catalyst with a yield of 64 g/g; In 2002, Meng Yuezhong developed a loaded zinc glutarate catalyst with an efficiency of 180 g/g; In 2009, Lv Xiaobing and others developed a chiral catalyst with an efficiency of up to kilograms per gram, which catalyzes the copolymerization of chiral epoxy propane and carbon dioxide; In 2010, Wang Xianhong and others developed a bimetallic rare earth composite catalytic system with an efficiency of 52 kg/g (the content of carbonate in the product is only about 43%). After 40 years of development, carbon dioxide polymerization technology has made significant progress compared to its predecessor. The structure of polymers determines their properties. Copolymerization of carbon dioxide with different types of epoxy monomers can change the number of carbon atoms in the main chain monomer unit and the properties of side chain groups of carbon dioxide copolyesters, resulting in polymers with different mechanical, thermal, hydrophilic and hydrophobic properties, as well as degradation properties. From Table l, it can be seen that the mechanical properties of polybutylene succinate (PBC), polyepoxycyclohexane carbonate (PCHC), and polystyrene carbonate (PStC) are superior to those of polyethylene carbonate polyols (PEC) and propylene carbonate polyols (PPC). However, it is difficult to obtain epoxy monomers for the copolymerization of these polymers and achieve industrial production. The monomers required for synthesizing PEC and PPC are epoxy propane and epoxy propane, which are easier to obtain. Therefore, PEC and PPC are currently the most studied and closest to industrial production requirements for aliphatic polycarbonates
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