96-76-4

3643-70-7

26741-53-7

(3) The product dichloropentaerythritol diphosphite obtained from step (2) was dropwise added to a 0.6 mol/L aqueous solution of 2,4-di-tert-butylphenol. The molar ratio of 2,4-di-tert-butylphenol to dichloropentaerythritol diphosphite was maintained at 2.30:1. The mixture was stirred under nitrogen at a speed of 800 rpm and reacted at 60°C for 2 hours. The hydrogen chloride gas generated during the reaction was absorbed by a sodium hydroxide solution. (4) The solvent was removed by減壓蒸餾 under reduced pressure at 100°C and 0.06 MPa. An appropriate amount of isopropanol was then added to the residue, and the mixture was stirred to crystallize the product. (5) The reaction mixture obtained from step (4) was subjected to suction filtration to yield a white solid powder, identified as bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

參考文獻：

[1] Patent: CN108250240, 2018, A. Location in patent: Paragraph 0034; 0037; 0038; 0106; 0108; 0110; 0112; 0114

抗氧化劑626為白色至類白色粉末狀物質，具有揮發(fā)性低，作用效率更高的特點，多與受阻酚類抗氧劑復配使用。

抗氧化劑626適用于：聚烯烴和烯烴共聚物，聚碳酸脂、聚酰胺等工程塑料，橡膠及彈性體，涂料及粘合劑。

抗氧化劑626的添加量：0.05-0.2%，具體添加量根據(jù)應用測試確定。