KR100360088B1 - Flame retardant marking ink composition for printing metal surface - Google Patents

Abstract

PURPOSE: A marking ink composition for printing the metal surface is provided, to improve the flame retardancy, the fluorescence and the printability in the case of the marking at 200 deg.C, and to reduce the drying time after printing. CONSTITUTION: The marking ink composition comprises 6-14 wt% of an inorganic or organic pigment; 1-5 wt% of a fluorescent dye; 70-80 wt% of a flame retardant organic solvent having a chlorine atom; and 4-8 wt% of a polymer resin which is soluble in the flame retardant organic solvent and is selected from a cellulose-derivative and an acryl-based polymer resin. The flame retardant organic solvent comprises 45-65 wt% of the organic solvent having a boiling point above 100 deg.C based on the total amount of the composition. Preferably the pigment is selected from the group consisting of titanium oxide, carbon black, an azo-based pigment and an anthraquinone-based pigment; and the flame retardant organic solvent is selected from the group consisting of methylene chloride, 1,1-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, tetrachloroethane and their mixtures.

Description

Flame Retardant Marking Ink Composition For Metal Surface Printing

The present invention relates to a flame retardant marking ink composition for metal surface printing, and more particularly, to a marking ink composition which is not only flame retardant to a metal surface, but also dries quickly and has excellent fluorescent color development and is excellent in printability even at high temperatures.

In the production process of various steel materials at the filing station, the polishing process at the machine shop, and the assembly work at the construction site, it is necessary to systematically classify and organize the metal materials in order to smoothly use the metal materials to be used in the next process. A marking operation is needed to mark the surface of the metal material.

In the vicinity of the marking workshop for the metal surface, a firearm is often used for welding, cutting, and the like. However, the marking ink needs to be flame retardant or nonflammable to prevent the marking ink from being ignited or fired.

In addition, most of the marking devices on the metal surface are sprayed to spray the ink onto the metal surface without touching the marking surface of each metal material with constant height and proper adjustment. There has been a need for marking inks in which printed text is clearly seen even when a dry, marked metallic material is to be used indoors or at night.

Conventional water-based inks used in the marking operation on the metal surface did not exhibit a predetermined shape due to the slow drying speed, but also had problems with the dried metal surface.

In order to solve this problem, Japanese Patent Publication Nos. 6-9917 and 4-209670 disclose oil-based marking inks which have a high drying speed, but the drying speed of these marking inks is improved, but the marking range tends to be wider in the metal plane. It is poorly attached to the metal surface, and it is difficult to identify the content after printing at the temperature of 120 ℃ or higher, and it is difficult to check the content at night, and to use a large amount of organic solvents such as alcohol and ketones. Therefore, the marking ink may be ignited by the heat from the fire near the marking workshop, resulting in a fire.

Accordingly, an object of the present invention is to solve the conventional problems as described above to have a flame retardance to fire, to dry quickly after printing, excellent fluorescence color development, even if sprayed at a temperature up to 200 ℃ improved printability It is to provide a marking ink composition for a metal surface.

According to the invention,

6-14% by weight inorganic or organic pigments,

Fluorescent dyes 1-5% by weight,

70-80% by weight of a flame-retardant organic solvent having a chlorine atom, containing 45-65% by weight of an organic solvent having a boiling point of 100 ° C. or more based on the total composition,

4-8% by weight of a polymer resin dissolved in the flame-retardant organic solvent and selected from cellulose derivatives and / or acrylic polymer resins, and

A flame retardant marking ink composition for printing a metal surface comprising other additives is provided.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention is composed of a fluorescent dye in inorganic or organic pigments, an organic solvent having a boiling point of 100 ° C. or higher, an organic solvent mixture of 100 ° C. or lower, and a polymer resin dissolved in the organic solvent, and having flame retardancy, rapid drying, fluorescent color development, and printability. An improved marking ink composition for printing metallic surfaces is provided.

In order to color an ink, the pigment used for the marking ink of this invention suitably selects and uses the conventionally well-known inorganic or organic pigment and the thing disperse | distributed stably as microparticles in the processing pigment which surface-treated the organic pigment with organic pigment. For example, inorganic pigments such as titanium oxide or organic pigments such as carbon black, azo and anthraquinones can be used.

The amount of the pigment added varies somewhat depending on the kind of pigment and other ink components, but is preferably 6-14% by weight based on the marking ink composition. When the amount of the pigment is less than 6% by weight relative to the marking ink composition, the amount of the pigment is too small to exhibit sufficient coloring, hiding power, and performance of the ink coating film, and when it is 14% by weight or more, the viscosity of the marking ink is increased. The workability is reduced.

Fluorescent dyes used for easy identification of printed content when using metal materials indoors or at night include Rhodamine B Base, Rhodamine 6GD, Celloton Brillant Yellow FFA-GF, Luraranbrylant Yellow G-3B, Brill lotus fonsou 4R, Brill lotus yellow 6GF, Amarryl brill lotus yellow 4GX and the like are used.

The amount of the fluorescent dye added is 1-5% by weight based on the marking ink composition. When the amount of the dye is less than 1% by weight, the amount of the dye is too small to exhibit sufficient fluorescence performance, and when the amount of the dye is 5% by weight or more, the printability of the marking ink occurs.

The organic solvent is to dissolve or disperse the pigments, resins, and additives used in the composition of the present invention. In the present invention, a flame retardant solvent is used to enable rapid drying of the marking ink and to meet the purpose of high temperature use.

Such flame retardant solvents include one or two or more of methylene chloride, 1,1-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene, tetrachloroethylene, and the like. It can be used by mixing.

The organic solvent is determined in consideration of the miscibility with other ink components and the metal surface temperature to be marked. In addition, when the high boiling point organic solvent is used, the printability at high temperature is improved, but there is a problem that the drying time is long, and the low boiling point organic solvent degrades the printability at high temperature.

The organic solvent is 70-80% by weight based on the marking ink composition.

Of these, the organic solvent having a boiling point of 100 ° C. or higher should be used at 45-65 wt% based on the total composition. In case of using less than 45% by weight, the printability at high temperature may drop rapidly, and when it exceeds 65% by weight, the dryness at room temperature is slow and the surface printed on the metal surface is not completely dried. In this case, the printing surface is damaged.

In addition, when the total amount is less than 70% by weight, including the organic solvent having a boiling point of 100 ° C or more, as well as the organic solvent having a chlorine having a boiling point of 100 ° C or less, the viscosity of the marking ink rises, resulting in poor workability. In some cases, the printing performance of the marking ink cannot be exhibited.

Therefore, in the present invention, by using an appropriately mixed organic solvent having a high boiling point and an organic solvent having a low boiling point, the printability at high temperature is improved and the drying speed thereof is also increased.

On the other hand, when it is necessary to improve the solubility in resin in the composition of the present invention, volatile solvents such as cellosolve acetate can be mixed and used within the range of 5% by weight or less based on the total weight of the composition. If it exceeds 5% by weight, the marking ink may ignite or ignite at a high temperature, which is undesirable.

The resin included in the composition of the present invention is used for the purpose of imparting adhesion on the metal surface, viscosity of the marking ink, and dispersion stability to the pigment in consideration of the film formation of the marking ink. The resin may be dissolved in at least one organic solvent, and has a heat resistance that does not cause discoloration of the marking ink even when marking on a metal surface having a high temperature, and uses a resin having good adhesion to the metal surface. Good to do.

Such resins include cellulose derivatives such as cellulose, cellulose acetate, cellulose acetate propionate and cellulose acetate butylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, One or more mixtures selected from the group consisting of acryl-based polymers of propyl methacrylate, butyl methacrylate and their copolymers are preferred.

These resins use 4-8% by weight based on the marking ink composition. When the amount of resin used is less than 4% by weight, the adhesion on the metal surface and the dispersion stability of the pigment are inferior, and when the amount of the resin is 8% by weight or more, the viscosity of the marking ink is increased, resulting in deterioration of workability and printing of the marking ink at high temperatures. The case occurs.

Tricresyl phosphate as an additive is used to impart flexibility to the resin to improve adhesion of marking ink to metal surfaces and to prevent cracking of the ink coating. This additive is preferably used at 6% by weight or less. When it exceeds 6 weight%, the printability of marking ink will fall.

The marking ink composition composed of the above-mentioned components is formulated into an ink having a viscosity of 100 cps or less to be sprayable.

In addition to the components described above, additives such as a viscosity modifier, a dispersant, a quencher, a lubricant, an antifoaming agent, and various active agents may be appropriately selected and used as necessary.

The marking ink composition of the present invention is easily prepared by mixing the required amount of each component and mixing and dispersing by a disperser such as a high speed stirrer, a ball mill and a three-stage roll mill.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

Marking Ink Composition Preparation

Each component was combined according to the composition and amount shown in the following table, followed by stirring for 3 hours in a three-stage roll mill and a high speed stirrer to prepare a marking ink composition.

TABLE 1

Example 2

Marking test for steel plate

Insert the marking ink of Example 1-3 and Comparative Example 1-3 prepared in Example 1 into a marking machine with a nozzle having an inner diameter of 36 μm attached to the tip, place the steel plate horizontally, and press the ink pressurized from 20 mm upwards. Sprayed.

At this time, the temperature of the surface of the steel sheet is changed from room temperature to 200 ° C. to mark white on the dried steel surface, time to reach contact drying at room temperature, and to check the marking content according to the temperature change and to check the marked content outdoors at night. The results are shown in Table 2 below.

TABLE 2

As can be seen from Table 2, Examples 1-3 satisfying the scope of the present invention exhibited a drying time of less than 100 seconds, and did not cause problems when the marking products were laminated in the next step, Because of the effect, the markings are visible at night and show good printability even at temperatures up to 200 ° C of the metal surface.

On the other hand, Comparative Examples 1 and 2, which do not satisfy the scope of the present invention, have a slow drying time, and printability is sharply reduced on a metal surface having a temperature of 150 ° C. or higher. In Comparative Example 3, the drying time was remarkably fast, but printability was lowered at a temperature of 120 ° C.

As described above, the marking ink composition of the present invention is not only flame retardant at the time of printing on the metal surface, but also dries quickly after printing, has good fluorescence color, and is excellent in printability even when marked at a temperature of 200 ° C.

Claims (4)

6-14% by weight of inorganic or organic pigments, based on the weight of the total composition, Fluorescent dyes 1-5% by weight, 70-80% by weight of a flame retardant organic solvent having a chlorine atom, and It is dissolved in the flame-retardant organic solvent and comprises 4-8% by weight of a polymer resin, selected from cellulose derivatives and acrylic polymer resin, Here, the flame-retardant organic solvent containing 45-65% by weight of the organic solvent having a boiling point of 100 ℃ or more based on the total composition, Marking ink composition for metal surface printing The composition of claim 1, wherein the pigment is selected from the group consisting of titanium oxide, carbon black, azo pigments, and anthraquinone pigments. The method of claim 1, wherein the flame retardant solvent is composed of methylene chloride, 1,1-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene and tetrachloroethylene At least one composition selected from the group The composition of claim 1, wherein the marking ink composition has a viscosity of 100 cps or less.