The present disclosure relates to a liquid leak sensor and, more particularly, to a liquid leak sensor for preventing damage to metallic electrodes attributable to a chemical solution, which are formed to detect the state of a leaking liquid on the top surface of a film. The liquid leak sensor includes a lower film in which at least one pair of metallic electrodes are formed on a top surface thereof in parallel at an interval in order to detect a leaking liquid, and a graphene ink layer coated to cover the electrodes. The graphene ink layer is formed by mixing graphene of 5 to 10 wt %, a binder of 30 to 50 wt %, 2-ethoxy ethanol of 20 to 25 wt %, DPGDME of 20 to 25 wt %, and a dispersant 5 to 10 wt % and then printing the mixture on the electrodes using graphene ink fabricated by high-pressure dispersion.

The present disclosure relates to a liquid leak sensor and, more particularly, to a liquid leak sensor for preventing damage to metallic electrodes attributable to a chemical solution, which are formed to detect the state of a leaking liquid on the top surface of a film. The liquid leak sensor includes a lower film in which at least one pair of metallic electrodes are formed on a top surface thereof in parallel at an interval in order to detect a leaking liquid, and a graphene ink layer coated to cover the electrodes. The graphene ink layer is formed by mixing graphene of 5 to 10 wt %, a binder of 30 to 50 wt %, 2-ethoxy ethanol of 20 to 25 wt %, DPGDME of 20 to 25 wt %, and a dispersant 5 to 10 wt % and then printing the mixture on the electrodes using graphene ink fabricated by high-pressure dispersion.

A metallic nanoparticle composition includes copper nanoparticles, a first non-aqueous polar protic solvent (boiling point in a range of 180 C. to 250 C. and viscosity in a range of 10 cP to 100 cP at 25 C.), and a second non-aqueous polar protic solvent (boiling point in a range of 280 C. to 300 C. and a viscosity of at least 100 cP at 25 C.). The concentration of copper nanoparticles in the composition is in a range of 32 wt % to 55 wt %, and the concentration of the second non-aqueous polar protic solvent in the composition is in a range of 4 wt % to 10 wt %. There is polyvinylpyrrolidone present on the copper nanoparticles surfaces. The composition's viscosity is at least 250 cP at 25 C.

A metallic nanoparticle composition includes copper nanoparticles, a first non-aqueous polar protic solvent (boiling point in a range of 180 C. to 250 C. and viscosity in a range of 10 cP to 100 cP at 25 C.), and a second non-aqueous polar protic solvent (boiling point in a range of 280 C. to 300 C. and a viscosity of at least 100 cP at 25 C.). The concentration of copper nanoparticles in the composition is in a range of 32 wt % to 55 wt %, and the concentration of the second non-aqueous polar protic solvent in the composition is in a range of 4 wt % to 10 wt %. There is polyvinylpyrrolidone present on the copper nanoparticles surfaces. The composition's viscosity is at least 250 cP at 25 C.

A water-based printing ink composition for gravure printing and a method for producing the same are provided. The water-based printing ink composition includes: 1 to 15 parts by weight of a pigment, 1 to 50 parts by weight of an aqueous resin mixture, 1 to 20 parts by weight of a quick-drying agent, and 30 to 80 parts by weight of water. The aqueous resin mixture includes a first aqueous resin and a second aqueous resin, a first glass transition temperature of the first aqueous resin is greater than a second glass transition temperature of the second aqueous resin, and an absolute value of the difference between the first glass transition temperature and the second glass transition temperature is not less than 40 C. The quick-drying agent is an alcohol or a ketone, and the quick-drying agent has a boiling point of not greater than 85 C.

A precoat liquid used in an intermediate-transfer image forming method in which an actinic radiation-curable ink and an intermediate transfer member are used, the precoat liquid being applied onto a surface of the intermediate transfer member before the actinic radiation-curable ink is applied onto the surface of the intermediate transfer member, includes a water-soluble organic solvent having two or more hydroxyl groups per molecule. The water-soluble organic solvent has a C value of more than 0.03, the C value being calculated using Expression (1).

A precoat liquid used in an intermediate-transfer image forming method in which an actinic radiation-curable ink and an intermediate transfer member are used, the precoat liquid being applied onto a surface of the intermediate transfer member before the actinic radiation-curable ink is applied onto the surface of the intermediate transfer member, includes a water-soluble organic solvent having two or more hydroxyl groups per molecule. The water-soluble organic solvent has a C value of more than 0.03, the C value being calculated using Expression (1).

A composition, and methods of making and using such a composition, whereby the composition can include a printable ink formulation having a colorant which undergoes a visible color change upon exposure to a wetness threshold. The colorant can be highly resistant to leaching. Additionally, the colorant can be resistant to premature activation via ambient moisture or humidity.

A composition, and methods of making and using such a composition, whereby the composition can include a printable ink formulation having a colorant which undergoes a visible color change upon exposure to a wetness threshold. The colorant can be highly resistant to leaching. Additionally, the colorant can be resistant to premature activation via ambient moisture or humidity.

Provided is an aqueous pigment ink for textile inkjet printing, including a pigment, a water-dispersible resin, water, and a water-soluble organic solvent, wherein an ink film made by drying the aqueous pigment ink for textile inkjet printing has a weight change ratio of 20% or less between before and after immersion in warm water at 50 C., and has a film elongation of 50% to 300% after immersion in warm water at 50 C. Also provided is a method for producing a printed textile item.