China Drying Network News Jilin Petrochemical Research Institute took the lead in setting up a mathematical model for sewage treatment in China, scientifically setting sludge return flow rate, dissolved oxygen, and excess sludge volume, etc., and determined appropriate sludge concentration, sludge age, and excess sludge. Emissions and other indicators have achieved research objectives such as improving the quality of effluent water, reducing the amount of sludge, and optimizing aeration, and passed the acceptance of Jilin Petrochemical Company.
Unsaturated polyester resin is a polymer obtained by the polycondensation reaction between polyacids and polyalcohols. The development of water is the by-product of this polycondensation process. Specifically, the unsaturated polyester resin, also known by the English acronym UPR, is an easily printable liquid polymer which, once cured (cross-linked with styrene, by the use of particular substances, organic peroxides, named hardeners), keeps the solid shape taken in the mold. The items so realized have exceptional strength and durability characteristics. Unsaturated polyester resins are mostly used in combination with reinforcing materials such as glass fibres, that give life to the FRP (an acronym deriving from the English), a polyester reinforced with glass fibres, better known with the name of fiberglass.
Unsaturated polyester resin
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