Synthetic method of isophorone diisocyanate

[0022] Example 1

[0023] (1) Dissolve 17 g of isophorone diamine in 195.5 g of chloroform, and dissolve 29.7 g of solid phosgene in 342 g of chloroform;

[0024] (2) Add the isophorone diamine solution dropwise to the solid phosgene solution at -20°C, and react for 7 hours. During this process, nitrogen is continuously introduced for gas replacement;

[0025] (3) The above reaction solution was heated to reflux, reacted for 5 hours, after the reaction was completed, cooled, filtered with suction, and the filtrate was distilled under reduced pressure to obtain 20.7 g of product. The product yield was 93.2% and the purity was 97.5%.

[0026] Example 2

[0027] (1) Dissolve 34 g of isophorone diamine and 0.64 g of N,N-dimethylformamide in 193 g of chloroform, and dissolve 29.7 g of solid phosgene in 168.3 g of chloroform;

[0028] (2) Add the isophorone diamine solution dropwise to the solid phosgene solution at 5°C, and react for 2 hours. During this process, nitrogen is continuously introduced for gas replacement;

[0029] (3) The above reaction liquid was heated to reflux, reacted for 2 hours, after the reaction was completed, cooled, filtered with suction, and the filtrate was distilled under reduced pressure to obtain the product 19.0, the product yield was 85.5%, and the purity was 94.3%.

[0030] Example 3

[0031] (1) Dissolve 25.5 g of isophorone diamine and 2.76 g of paraformaldehyde in 203.5 g of dichloroethane, and dissolve 29.7 g of solid phosgene in 240.3 g of dichloroethane;

[0032] (2) Add the isophorone diamine solution dropwise to the solid phosgene solution at -10°C, and react for 4.5 hours. During this process, nitrogen is continuously introduced for gas replacement;

[0033] (3) The above reaction solution was heated to reflux, reacted for 8 hours, after the reaction was completed, cooled, filtered with suction, and the filtrate was distilled under reduced pressure to obtain 20.2 g of product. The product yield was 90.8% and the purity was 93.1%.