(1) The viscosity of the prepared storage ink is between 300~500Pa. Around s, during printing, the viscosity of the ink should be adjusted with thinner to suit the printing process.
(2) When using screen printing inks for screen printing patterns or logos, polyester screens below 200 mesh should generally be selected. 80-120 mesh screen cloths can be used to obtain the best luminous effect.
(3) When using a light-storing ink, consider printing on a white substrate as much as possible. This can better improve the brightness and afterglow time of the printed pattern or logo.
(4) When the coating thickness of the printing and accumulating ink is controlled at 130 to 150 μm, the light emitting effect is the best. Therefore, this thickness can be achieved by using 80 mesh screen printing twice.
(5) When the substrate is a transparent object, the white ink should be printed before printing the light-storing ink, which can improve the light-emitting effect.
4, storage ink practical examples
Second, light storage printing paste
1. Composition and preparation of luminous luminous printing paste
There are two problems that must be solved when storing light-emitting luminescent materials on textile printing:
(1) The protection of the light-storing luminescent material and its own stability.
(2) The combination of the light-storing light-emitting material and the fabric forms a uniform one-piece pattern.
Although the storage of light-storage printing paste is made of a light-storing type light-emitting material and a transparent printing paste, the requirements for the printing paste composition should be that the use of an adhesive, a paste, and an auxiliary additive all have no effect on the light-storage material; Aluminate, silicate, and sulfide system light storage materials are safe to humans and the environment. Such as the use of rare earth alumina light storage luminous material is easy to be hydrolyzed, so when preparing printing paste, it is best to use a special white emulsified paste made from white flame oil (similar to A paste), printing soft hand feeling is good, the film has good transparency Adhesive ingredients, generally do not add cross-linking agent to meet the various standards of fastness. If the rheological properties of the printing paste are changed due to the addition of a light-storing pigment, an oil-based rheological property modifier and a hand-feeling fastness adjusting agent may be added in order to obtain the best printing effect. The light-storing printing paste is an oil-based printing paste. Therefore, in principle, the paste cannot be used to modulate the printing paste using a thickener paste compound that is synthesized by the all-aqueous phase system. Since the light-storing material is more expensive, it will be affected by the loss of partial hydrolysis. effect.
The biggest disadvantage of aluminate materials is poor water resistance, which leads to decomposition of water, resulting in reduced luminescence and even complete loss of luminescence. When it is necessary to use an aqueous slurry, the surface of the light-storing material may be first subjected to surface coating treatment (ie, light-emitting material is micro-gelled), so that the water-repellent performance can be improved. Furthermore, from the viewpoint of the properties of the ingredients, a neutral or alkaline transparent printing paste is used together with the light-storing material. The preparation method is: in a clean stainless steel container, the paste→adhesive→variable-speed emulsification is performed in the following order: Stir at high speed into a homogenous slurry → Add oily rheology modifier and feel fastness modifier → Medium speed into a light storage printing paste Ready-to-use stock slurry.
Prior to printing, 20% to 25% (mass) of the light-storing material is added to the above slurry, and then blended at medium or slow speed for printing on the machine. Do not use high-speed beating when mixing, so as not to affect the luminous effect.
(to be continued)