Reversible temperature-changeable water-based ink and its preparation method and application

Abstract

The invention belongs to the technical field of inks, and in particular relates to a reversible temperature-changing water-based ink and its preparation method and application. The reversible temperature-changing water-based ink provided by the present invention comprises the following components: 25-35 parts by weight of water-based binder, 10-25 parts by weight of nano vanadium dioxide, 5-15 parts by weight of non-toxic alcohol cosolvent and 15-15 parts by weight of water 25 parts by weight. The water-based ink of the present invention uses water and a small amount of non-toxic alcohols as solvents instead of organic solvents, has no pollution, is safe and pollution-free, and has lower price, low discoloration temperature, sensitive thermal response and good printability, and can be widely used in food, Non-toxic and anti-counterfeiting packaging for various commodities such as medicines, daily chemicals, tobacco and alcohol bags, and children's toys.

Description

technical field

[0001] The invention belongs to the technical field of inks, and in particular relates to a reversible temperature-changing water-based ink and its preparation method and application. Background technique

[0002] While meeting the needs of the masses, printing products gradually present a new trend of quality, personalization, and customization. Green printing and digital printing have developed rapidly. With the rise of digital printing, digital anti-counterfeiting technology has also been developed by leaps and bounds. Advanced anti-counterfeiting technology plays a very good role in regulating commodities in the fierce market competition environment. Among many anti-counterfeiting technologies, temperature-changing ink is a very important technical branch, involving optics, chemistry, materials science, nanotechnology, Computer science, printing technology and many other science and technology categories are currently the most researched parts in the fie...

Examples

preparation example Construction

[0031] The present invention also provides a method for preparing the above-mentioned reversible temperature-changing water-based ink. In a preferred embodiment, the specific steps are as follows:

[0032] (1) Mix the water-based binder, nano vanadium dioxide, non-toxic alcohol co-solvent, water and fillers, driers and / or water-based antioxidants added as needed to obtain a spare color paste;

[0033] (2) adjusting the pH of the spare color paste obtained in the step (1) by a pH regulator to be 8-9.5 to obtain a thermochromic water-based ink. Wherein, the pH regulator is selected from one or more of ethanolamine, ammonia water and triethylamine.

[0034] In a preferred embodiment of the present invention, the nano vanadium dioxide is prepared through the following steps:

[0035] Add vanadium pentoxide and oxalic acid dihydrate into water at a molar ratio of 1:1~3, heat and stir to form an aqueous solution, undergo a hydrothermal reaction at 180-250°C for 24-48 hours, cool to...

Embodiment 1

[0060] 1. Preparation of water-based polyurethane binder: Dry polypropylene glycol with a molecular weight of 2000 in vacuum at 110°C for 1.5h, mix and react with isophorone diisocyanate at 90°C for 1.5h, and then add the environmentally friendly organic bismuth catalyst DY -20 After continuing to accelerate the reaction for 1 hour, lower the temperature of the system to 60°C, add chain extender dimethylol propionic acid for chain extension reaction for 20 minutes, raise the temperature to the initial reaction temperature of 90°C, continue the reaction for 2 hours, then cool down to 50°C, add 1 , 4-butanediol and acetone adjust the viscosity of the system to 13mPa.s and continue to stir for 1 hour to obtain a water-based polyurethane prepolymer. Lower the temperature of the system to room temperature, add deionized water and a certain amount of ethanolamine, and adjust the pH value between 8.5 , Aging at room temperature for 12 hours, rotary evaporation to remove unreacted orga...

Embodiment 2

[0065] 1. Preparation of water-based polyurethane binder: same as Step 1 of Example 1.

[0066] 2. Preparation of nano-vanadium dioxide: add vanadium pentoxide and oxalic acid dihydrate to water at a feeding molar ratio of 1:1, heat and stir to form an aqueous solution, and cool to room temperature after hydrothermal reaction at 180°C for 48 hours, then separate The precipitate was washed with distilled water and ethanol, dried, and annealed at 800° C. for 2 hours under argon to obtain nano vanadium dioxide.

[0067] 3. Preparation of reversible temperature-changing water-based ink: 25 parts by weight of water-based polyurethane binder, 25 parts by weight of nano-vanadium dioxide, 5 parts by weight of non-toxic alcohol co-solvent, 25 parts by weight of water, nano-silica 25 parts by weight of powder, 0.5 parts by weight of drier and 3 parts by weight of antioxidant were uniformly mixed to obtain 30 g of spare color paste, and the pH of the spare color paste was adjusted to 8 b...

technical field

[0001] The invention belongs to the technical field of inks, and in particular relates to a reversible temperature-changing water-based ink and its preparation method and application. Background technique

[0002] While meeting the needs of the masses, printing products gradually present a new trend of quality, personalization, and customization. Green printing and digital printing have developed rapidly. With the rise of digital printing, digital anti-counterfeiting technology has also been developed by leaps and bounds. Advanced anti-counterfeiting technology plays a very good role in regulating commodities in the fierce market competition environment. Among many anti-counterfeiting technologies, temperature-changing ink is a very important technical branch, involving optics, chemistry, materials science, nanotechnology, Computer science, printing technology and many other science and technology categories are currently the most researched parts in the fie...

Examples

preparation example Construction

[0031] The present invention also provides a method for preparing the above-mentioned reversible temperature-changing water-based ink. In a preferred embodiment, the specific steps are as follows:

[0032] (1) Mix the water-based binder, nano vanadium dioxide, non-toxic alcohol co-solvent, water and fillers, driers and / or water-based antioxidants added as needed to obtain a spare color paste;

[0033] (2) adjusting the pH of the spare color paste obtained in the step (1) by a pH regulator to be 8-9.5 to obtain a thermochromic water-based ink. Wherein, the pH regulator is selected from one or more of ethanolamine, ammonia water and triethylamine.

[0034] In a preferred embodiment of the present invention, the nano vanadium dioxide is prepared through the following steps:

[0035] Add vanadium pentoxide and oxalic acid dihydrate into water at a molar ratio of 1:1~3, heat and stir to form an aqueous solution, undergo a hydrothermal reaction at 180-250°C for 24-48 hours, cool to...

Embodiment 1

[0060] 1. Preparation of water-based polyurethane binder: Dry polypropylene glycol with a molecular weight of 2000 in vacuum at 110°C for 1.5h, mix and react with isophorone diisocyanate at 90°C for 1.5h, and then add the environmentally friendly organic bismuth catalyst DY -20 After continuing to accelerate the reaction for 1 hour, lower the temperature of the system to 60°C, add chain extender dimethylol propionic acid for chain extension reaction for 20 minutes, raise the temperature to the initial reaction temperature of 90°C, continue the reaction for 2 hours, then cool down to 50°C, add 1 , 4-butanediol and acetone adjust the viscosity of the system to 13mPa.s and continue to stir for 1 hour to obtain a water-based polyurethane prepolymer. Lower the temperature of the system to room temperature, add deionized water and a certain amount of ethanolamine, and adjust the pH value between 8.5 , Aging at room temperature for 12 hours, rotary evaporation to remove unreacted orga...

Embodiment 2

[0065] 1. Preparation of water-based polyurethane binder: same as Step 1 of Example 1.

[0066] 2. Preparation of nano-vanadium dioxide: add vanadium pentoxide and oxalic acid dihydrate to water at a feeding molar ratio of 1:1, heat and stir to form an aqueous solution, and cool to room temperature after hydrothermal reaction at 180°C for 48 hours, then separate The precipitate was washed with distilled water and ethanol, dried, and annealed at 800° C. for 2 hours under argon to obtain nano vanadium dioxide.

[0067] 3. Preparation of reversible temperature-changing water-based ink: 25 parts by weight of water-based polyurethane binder, 25 parts by weight of nano-vanadium dioxide, 5 parts by weight of non-toxic alcohol co-solvent, 25 parts by weight of water, nano-silica 25 parts by weight of powder, 0.5 parts by weight of drier and 3 parts by weight of antioxidant were uniformly mixed to obtain 30 g of spare color paste, and the pH of the spare color paste was adjusted to 8 b...

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