Epoxy resin catalytic refining process

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Catalytic purification process for epoxy resin: A catalytic purification method for epoxy resin, with the following preparation steps: Bisphenol A and epichlorohydrin are fed in a mass ratio of 1:1.0–1.2; the mixture is heated to 55–65°C under a pressure of 19–24 KPa. Sodium hydroxide is then added, at a dosage of 166 kg per ton of the theoretical resin output. After reacting for 3–5 hours, the excess epichlorohydrin is distilled off to obtain an intermediate product of epoxy resin； To the epoxy resin semi-finished product, benzyltriethylammonium chloride in an amount of 4.0–5.0‰ of the theoretical mass of the resin is added as a catalyst. The amount of sodium hydroxide required is calculated based on the organic chlorine content, using the formula: mass of sodium hydroxide = organic chlorine content in the semi-finished product × 400 × theoretical mass of the resin × (1.1–3.5). The sodium hydroxide is then prepared into a solution with a mass concentration of 12–15%, which is added to the epoxy resin semi-finished product. Solvent toluene is added in an amount of 90–110% of the theoretical mass of the resin. The mixture is reacted at a temperature of 79–83°C for 2–4 hours, after which it is washed and the solvent is removed to obtain the epoxy resin. Application (Patent) Number: CN200710191180.6 Application Date: 12-11-2007 Publication (Announcement) Date: 5-14-2008 Publication (Announcement) Number: CN101177477 Main Classification Number: C08G59/06(2006.01)I . C . C08 . C08G . C08G59 . C08G59/06 Classification Number: C08G59/06(2006.01)I . C . C08 . C08G . C08G59 . C08G59/06 Applicant (Patentee): Wuxi Resin Factory of Lanxing Chemical New Materials Co., Ltd. Inventors: Wu Jun, Jiang Xiuming Address of the main applicant: No. 18, Wangzhuang Road, New District, Wuxi City, Jiangsu Province, 214011 Patent Agency: Nanjing Jingwei Patent and Trademark Agency Co., Ltd. Agent: Lu Zhibin Country/Province Code: Jiangsu; 32 Independent Claim: 1. A catalytic refining process for epoxy resin, characterized in that the preparation steps are as follows: a. Bisphenol A and epichlorohydrin are fed in a mass ratio of 1∶1.0～1.2; the mixture is heated to 55～65℃ under a pressure of 19～24 Kpa, sodium hydroxide is added in an amount of 150～200 kg per ton of the theoretical resin output, and after reacting for 3～5 hours, the excess epichlorohydrin is distilled off to obtain an epoxy resin semi-finished product ； b. Add benzyltriethylammonium chloride in an amount of 4.0–5.0‰ of the theoretical mass of the resin as a catalyst to the epoxy resin semi-finished product. The amount of sodium hydroxide required is calculated based on the organic chlorine content; the formula for this calculation is: mass of sodium hydroxide = organic chlorine content in the semi-finished product × 400 × theoretical mass of the resin × (1.1–3.5). Prepare a solution of sodium hydroxide with a mass concentration of 12–15% and add it to the epoxy resin semi-finished product. Then, add toluene in an amount of 90–110% of the theoretical mass of the resin. React the mixture at a temperature of 79–83°C for 2–4 hours, followed by washing to remove the solvent, thereby obtaining the epoxy resin. Legal status: Public