LTH(SZ:000912) Jin Rong Jie·2025-08-29 02:17Core Viewpoint - Sichuan Lutianhua Innovation Research Institute Co., Ltd. has applied for a patent for an efficient method of preparing polycarbonate diol, indicating advancements in polymer material synthesis technology [1] Group 1: Patent Application Details - The patent titled "A Method for Efficient Preparation of Polycarbonate Diol" has a publication number CN120535736A and was applied for on June 2025 [1] - The preparation method involves adding raw material diol and catalyst into a polyester reaction kettle under nitrogen protection, followed by a series of temperature-controlled reactions [1] Group 2: Methodology Overview - The process includes heating to 145°C ± 5°C, slowly adding dimethyl carbonate over 4 hours, and then raising the temperature to 180°C for 2 hours [1] - A gradient temperature increase of 1°C/min is applied while reducing pressure, ultimately reaching a temperature of 210°C ± 5°C [1] - The vacuum is gradually increased, and after stabilization, the reaction is maintained at 210°C for 1 to 1.5 hours [1]