Preparation method of printing prime coat white ink for identification card

By using modified polyurethane adhesive, white color paste and polyvinyl alcohol solution on the color card base material, the problems of clear printing on the color card and smooth surface of the white ink are solved, and efficient printing effect and good water resistance and hot press peel strength are achieved.

CN119684841APending Publication Date: 2025-03-25JIANGSU HUAXIN HIGH TECH MATERIALS CO LTD
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Patent Information

Application Number
CN202411879527.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

It is difficult for the prior art to realize clear text and bright image printing on color card base materials, and the white ink base must have a smooth and delicate surface for easy printing, and it must not change color and deformation under high temperature and pressure.

Method used

By polymerizing using dicyclohexylmethane-4,4-diisocyanate and polycarbonate diol, and adding epoxy resin to the polymer for block modification, a long-chain aqueous polyurethane binder was prepared, combined with a white color paste and a polyvinyl alcohol solution, and after mixing and stirring and filtration, a printing primer white ink suitable for color card printing was prepared.

Benefits of technology

It realizes clear printing on the color card base material, the white ink surface is smooth and delicate, has good water resistance and hot press peeling strength, and does not change color and deformation under high temperature and pressure.

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Abstract

The invention relates to the technical field of high polymer materials, in particular to a preparation method of printing base coat white ink for identification cards, which comprises the following steps: polymerizing dicyclohexylmethane-4, 4-diisocyanate and polycarbonate diol, adding epoxy resin into the polymer for block modification, sealing opposite end-NCO by using methyl ethyl ketoxime, and adding the epoxy resin into the polymer for block modification, thereby obtaining the printing base coat white ink for identification cards. Preparing a modified polyurethane prepolymer by using a hydrophilic chain extender, adding a neutralizer for neutralization, adding water for emulsification, and carrying out chain extension again by using hydrazine hydrate to obtain the long-chain waterborne polyurethane adhesive. The preparation method comprises the following steps: grinding universal rutile titanium dioxide, nano calcium carbonate and a matched stabilizer to obtain white color paste; polyvinyl alcohol is selected and dissolved in boiling water, and a polyvinyl alcohol solution is obtained; according to the method, the long-chain waterborne polyurethane adhesive, the white color paste, the polyvinyl alcohol solution and the auxiliaries are mixed, stirred and left to stand to obtain the printing base coat white ink, the printing base coat white ink is easy to coat, the solid content of the printing base coat white ink can reach 64-66%, and the printing base coat white ink is suitable for printing of certificates and cards prepared from multiple colors.
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