At present, the synthetic methods of polyketone resin in China

At present, the synthesis method of polyketone resin in China mainly uses sodium hydroxide as catalyst. After the resin is formed, it is neutralized with acid, which often leads to excessive or insufficient neutralization. The generated salt and residual acid or alkali should be removed by repeated washing, resulting in a large amount of industrial wastewater, varying degrees of environmental pollution and long production cycle, As a result, part of the resin is lost with water washing, affecting the yield of the resin.

In order to solve the problem of neutralization end point, after the polycondensation of cyclohexanone and formaldehyde, Lin Yang and others added substances that can be hydrolyzed under alkaline conditions (such as haloalkanes, ethyl acetate, etc.) to neutralize the materials after the reaction. The Gardner chromaticity of the prepared resin is in the range of 1-3 and the softening point is in the range of 70-95 ℃. However, this method only ensures the neutralization end point, but still can not omit the washing process. Xiaobian has developed a semi continuous cyclohexanone formaldehyde resin production process, which uses barium hydroxide or calcium hydroxide as catalyst. After the condensation polymerization of cyclohexanone and formaldehyde is completed, carbon dioxide is used for neutralization in the absorption tower, which saves the water washing process, greatly shortens the production cycle and eliminates the problem of wastewater in the production process.   

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