Thermal foaming ink with excellent adhesive force, and preparation method and application thereof

[0066] Hereinafter, the preparation method of the present invention will be further described in detail in conjunction with specific examples. It should be understood that the following examples are only illustrative and explanation of the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies implemented based on the foregoing contents of the present invention are covered by the scope of the present invention.

[0067] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents, materials, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.

[0068] Preparation Example 1

[0069] Preparation of polyester adhesion promoter:

[0070] The content (mass percentage) of each component in the composition for preparing the polyester adhesion promoter is as follows:

[0071] Dimerized rosin: 5.00%

[0072] Polyalcohol (Priplast 3174): 40.00%

[0073] Castor oil fatty acid: 48.00%

[0074] Trimellitic anhydride: 7.00%.

[0075] In a four-necked flask, mix Priplast 3174 and castor oil fatty acid, pass nitrogen protection, and heat up to 160°C. When the temperature reaches 90°C, add dimerized rosin and continue to heat up until the dimerized rosin is completely dissolved in the system. When the temperature reached 160°C, the vacuum was turned on to remove water and reacted for 6 hours. The temperature is lowered to 120° C., trimellitic anhydride solid is added until the system is clear and transparent, and the reaction is continued for 2 hours, and the temperature is lowered to room temperature to obtain the polyester adhesion promoter, wh

[0077] Example 1

[0078] In the mixture of ethanol and water, add sodium hydroxide to adjust pH=8.5, keep the temperature at 55° C. under heating, and slowly add styrene-acrylate resin (solid form) until it is fully dissolved. Cool to room temperature to form a resin solution. Mix the pigments or dyes, solvents, optionally polyester adhesion promoters and optionally other additives in sequence, and mix them evenly. See Table 1 for the specific ratio.

[0079] Table 1

[0080]

[0081] Place the mixed ink overnight, filter, and pour it into the HP ink cartridge package. After 24 hours, the test was printed on the BOPP film. After the handwriting was dry, the handwriting adhesion was evaluated by sliding the fingers. The test scoring standards and results are shown in Table 2. The result evaluation scores in Table 2 are between 1 and 10. Among them, 1 is the worst and 10 is the best.

[0082] Table 2

[0083] Ratio 1 Ratio 2 Ratio 3 Ratio 4 Printing smoothness good good good good