Method for producing pigment nanoparticles by forced ultrathin film rotary reaction method, pigment nanoparticles, and inkjet ink using the same

摘要

A forced ultrathin film rotary reaction method is used to maintain a minute space of 1 mm or less between two processing surfaces capable of approaching to and separating from each other and being rotating relative to each other, and the minute space is maintained between the two processing surfaces to serve as a flow path of a fluid to be processed thereby forming a forced thin film of the processed fluid and separating the pigment material in the forced thin film.

主权项

1. A method for producing pigment nanoparticles comprising the step of separating pigment substances in use of a forced thin film rotary reaction method, wherein the forced thin film rotary reaction method comprises the steps of:
providing a fluid pressure imparting mechanism for imparting pressure to a fluid to be processed; providing at least two processing members of a first processing member and a second processing member, the second processing member being capable of approaching to and separating from the first processing member; providing a rotation drive mechanism for rotating the first processing member and the second processing member relative to each other, wherein the first processing member comprises a first processing surface, and the second processing member comprises a second processing surface, the first and second processing surfaces positioned facing each other, wherein each of the processing surfaces constitutes part of a sealed flow path through which the fluid under the pressure is passed, wherein two or more fluids to be processed, at least one of which contains a reactant, are uniformly mixed and positively reacted between the processing surfaces, wherein, of the first and second processing members, at least the second processing member is provided with a pressure-receiving surface, and at least part of the pressure-receiving surface is comprised of the second processing surface, wherein the pressure-receiving surface receives pressure applied to the fluid by the fluid pressure imparting mechanism thereby generating a force to move in the direction of separating the second processing surface from the first processing surface, wherein the fluid under the pressure is passed between the first and second processing surfaces being capable of approaching to and separating from each other and rotating relative to each other, whereby the fluid under the pressure forms a thin film fluid in a minute space of 1 μm to 1 mm formed between both the processing surfaces; providing another introduction path independent of the flow path through which the fluid to be processed under the pressure is passed; and providing at least one opening leading to the introduction path and being arranged in at least either the first processing surface or the second processing surface, wherein at least one fluid to be processed sent from the introduction path is introduced into between the processing surfaces, whereby the fluid under the pressure and the at least one fluid to be processed are mixed in the thin film fluid thereby separating pigment substances, wherein the first processing surface and the second processing surface are circular, one side of an outer side of the first processing surface and the second processing surface or a center side of the same is an upstream side, and the other side is a downstream side, and at least one of the first processing surface and the second processing surface is formed with a groove-shaped depression extending from the upstream side to the downstream side, the groove-shaped depression being formed in the processing surface which rotates, an upstream end of the groove-shaped depression reaching an periphery surface of one of the outer side and the center side, which defines the upstream side, of the rotating processing surface, and an downstream end of the groove-shaped depression being spaced from an periphery surface of the other of the outer side and the center side, which defines the downstream side, of the rotating processing surface, wherein the fluid to be processed under the pressure is introduced between the first processing surface and the second processing surface by a micro-pump effect by rotation of the processing surface provided with the groove-shaped depression, and wherein the opening is positioned downstream at a point where a direction of flow of the fluid under the pressure is changed to a direction of flow of the spiral laminar flow formed between the both of processing surfaces.