Preparation method of high-whiteness thermosensitive color developing agent containing sulfonylurea structure
A technology containing sulfonylurea and high whiteness, which is applied in the field of preparation of heat-sensitive developer, which can solve the problem that the purity of color developer and whiteness affect the quality of thermal paper, the preparation process is cumbersome and complicated, and the heat-sensitive paper is dark. problems, to achieve the effect of preventing poor color, improving the purity of filter cake, and preventing oxidation and discoloration
Pending Publication Date: 2022-03-01
HEBEI JIANXIN CHEM IND CO LTD
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A preparation method of a high-whiteness thermosensitive color developing agent containing a sulfonylurea structure comprises the following steps: dissolving MAP in an organic solvent, slowly dropwise adding PTSI into the organic solvent, and carrying out heat preservation to a reaction endpoint to obtain an intermediate product N-p-toluenesulfonyl-N '-(3-hydroxyphenyl) urea system; adding alkali liquor into the obtained intermediate product system for dissolving, then slowly dropwise adding an organic solution of PTSC, simultaneously dropwise adding the alkali liquor to control the pH value of the system, and carrying out heat preservation reaction to the end point to obtain a product N-p-toluenesulfonyl-N '-(3-p-toluenesulfonyloxyphenyl) urea system; adding an alcohol solvent into the prepared N-p-toluenesulfonyl-N-(3-p-toluenesulfonyloxy phenyl) urea system, neutralizing with acid, and filtering to obtain a filter cake; and carrying out post-treatment and vacuum drying on the filter cake to obtain a final product. According to the preparation method disclosed by the invention, the sulfonylurea color developing agent with high yield, high purity, whiter color and less solvent residue can be obtained, and the process operation is more suitable for industrial production.
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Organic compound preparationSulfonic acid amide preparation
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