KR100550658B1 - method of manufacturing waterborne paint using the marking - Google Patents

Abstract

A method for producing an aqueous coating material for marking applied to a thick steel sheet surface is disclosed. The above-described method comprises 15 to 35% by weight of the acrylic emulsion resin in the mixture formed after first mixing 7 to 14% by weight of water, 1 to 4% by weight of dispersant, 2 to 4% by weight of auxiliary agent and 37 to 65% by weight of pigment, 0.5 to 1.5% by weight of the film forming inhibitor and the additives are added to the mixture, and 2 to 15% by weight of the thickener is added to form an aqueous coating material for marking. The paint produced in this way prevents the spray nozzle from clogging during the marking process on the surface of the steel plate and enables clear marking at all temperatures from room temperature up to 300 ° C.

Description

Method of manufacturing waterborne paint using the marking}

The present invention relates to a method of manufacturing an aqueous coating material for marking used in a process of marking identification information, and more particularly, to a marking aqueous solution applied to a process of marking a paint on a steel sheet after being formed in a predetermined process. It is related with the manufacturing method of paint.

In general, a method of marking using a paint on a thick steel sheet is applied to a stencil type device, which uses an air inhalation method by an automated machine on a thick steel sheet for punching paper through computer drilling. After transfer, it is carried out by spraying 0.6 liters of marking paint per hour with airless spray with a nozzle diameter of 0.36 mm while being fixed.

In this case, when the spray nozzle is applied to a long time operation, it should not be easily clogged. In addition, the marking paint should be applied evenly over the minimum amount so that marking defects are evenly applied to the perforated holes of the paper.

In addition, an excessive amount of marking paint is sprayed and the weight of the punched paper becomes heavy, so that the punched paper is dropped and the marking defect is not dropped in the automated process of lifting and removing the punched paper by the air suction method, that is, about 0.6 hours per hour. L Marking paint should be sprayed.

And the conditions of the coating film for carrying out the method should be carried out the process of marking on the steel plate surface at a temperature of about 300 ℃ from room temperature in winter, not only the coating film should be formed at a low temperature but also at a holding temperature of 300 ℃ Failure of the coating shall not occur. In addition, the spray nozzle should be prevented from clogging when spraying.

However, the paint used to mark the surface of the thick steel plate has been applied to oil-based marking paint and water-based marking paint, but there are a number of problems.

Here, when performing the marking process using the oil-based marking paint, since the marking paint contains an organic solvent such as methyl ethyl ketone, toluene, xylene, cyclohexanone, due to the scattering of volatile organic compounds during long time use Not only is the risk of fire very high, but it also harms the health of workers.

In addition, when the marking process is performed using an aqueous type of coating paint, the merits of the aqueous type have a small impact on fire risk and worker's health, but an aqueous metal catalyst must be used for the oxidation polymerization of alkyd components. In storage and storage, a problem arises in that the aqueous metal catalyst promotes the gelation of the paint, thereby making the paint poor.

In addition, due to the drying method of the emulsion in which the coating film is formed by the fusion of water between the particles, the problem of clogging of the nozzle tip during operation due to the inability to dissolve the dry coating film and the boiling of the paint at a high temperature occurs. .

An object of the present invention for solving the above problems is to provide a method of producing an aqueous coating material for marking to prevent the phenomenon that the spray nozzle is clogged during the marking process of the coating material does not boil even at a high temperature.

In order to achieve the above-described object of the present invention, a method of preparing an aqueous coating material for marking is performed by mixing 7 to 14 wt% of water, 1 to 4 wt% of a dispersant, 2 to 4 wt% of an auxiliary agent, and 37 to 65 wt% of a pigment. A mixture was formed, and 15 to 35% by weight of the acrylic emulsion resin, 0.5 to 1.5% by weight of the film forming inhibitor and the additives were mixed to the formed first mixture to form a second mixture, and 5 to 15% by weight of the thickener in the second mixture. It is added to form the aqueous coating for marking.

The aqueous coating material for marking steel sheet formed in this way can prevent the clogging of the nozzle of the spray device and control the absorbency of the punched paper for marking quality, thereby making it easier to mark the coating film on the rear surface of the steel sheet.

The manufacturing method of the aqueous coating material for marking of this invention is demonstrated in detail.

The marking aqueous paint used for marking identification information for identifying steel sheets used in shipbuilding, construction, bridges, pressure vessels, etc. is formed by applying acrylic emulsion resins, pigments, film forming inhibitors, thickeners, dispersants, auxiliaries, and water. do.

That is, the manufacturing method of the aqueous coating material for marking of the present invention is, first, 7 to 14% by weight of water, 1 to 4% by weight of dispersant, cryoprotectant, wet dispersant, ark agent, 2 to 4% by weight of an antifoaming agent and a pigment. 37 to 65 wt% is first mixed to form a first mixture. At this time. The first mixing is carried out by mixing with a high speed disperser until the spraying degree of the first mixture is at least 7 Hegman particle size.

Subsequently, 15 to 35% by weight of the acrylic emulsion resin, 0.5 to 1.5% by weight of the film forming inhibitor and the predetermined additives (water and antifoaming agent) are secondly mixed with the first mixture to form a second mixture, and then the second formed By mixing 5 to 15% by weight of the thickener in the mixture to form an aqueous coating material for marking having a thixotropy index value of 3 to 5.

The cryoprotectant is ethylene glycol, the wet dispersant is polyoxyethylene alkyl ether, the preservative is an isothiazolinone mixture, and the antifoaming agent is used to form Foamax 810 from Tego, Germany, and an aqueous coating material for marking steel sheets of the present invention. The acrylic emulsion resin is characterized in that the minimum forming film has a temperature of 10 ° C. or less, and has a solid content of 40 to 45% by weight so that cracks of the coating film do not occur when the coating is performed at room temperature.

Here, when the minimum coating film formation temperature exceeds 10 ℃ when forming the coating film at room temperature with the acrylic emulsion resin itself, there may be no problem, but in the state of mixing with pigments and other paint materials, the lowest coating film of the acrylic emulsion resin itself Since the forming temperature of the coating film is higher than the forming temperature, there is no problem in the use of the high temperature steel sheet, but when the marking process is performed on the steel plate of the room temperature in winter, the coating film is not formed, and cracks occur and appear. Cause problems.

As the above-mentioned arctic emulsion resin, NOUSION-0058 (Norusion-0058), NOUSION-0056 (Norusion-0056), etc. of D.P.I company can be used.

And, when the acrylic emulsion resin used to form the aqueous coating material for marking is less than 15% by weight, the content of the acrylic emulsion resin is relatively small compared to the pigment applied to form the aqueous coating material for marking. The problem that the adhesiveness of the coating film formed from the coating material falls is produced.

When the acrylic emulsion resin is more than 35% by weight when the high temperature of the steel sheet is applied to the boiling phenomenon of the marking water-based coating occurs due to the problem of poor marking.

Accordingly, the acrylic emulsion resin used to form the aqueous coating material for marking is preferably used within 15 to 35% by weight.

When the amount of the pigment used to form the aqueous coating material for marking of the steel sheet of the present invention is less than 37% by weight, the content of the relative acrylic emulsion resin becomes high, resulting in a coating phenomenon, resulting in poor quality of the marking. do. When the amount of the pigment used exceeds 65% by weight, since the relative acrylic emulsion resin content is smaller than that of the pigment, adhesion of the coating film formed of the aqueous coating material for marking is lowered. As a result, the marking paints fall off during product movement and loading, and thus, product information cannot be confirmed, and thus, remarking must be performed manually.

Therefore, the pigment applied to form the aqueous coating for marking is preferably used within 37 to 65% by weight.

At this time. As the pigment used, it is preferable to use titanium dioxide having a rutile type crystal having excellent whiteness having a certain content of a white pigment or more, and as a white pigment, Taipure-700, Typure-902, Typure- 960 can be used.

Conventionally, when a long time of forming the coating film by spraying an aqueous emulsion resin with a spray device, the nozzle part of the spray device close to the base of the steel sheet having a high temperature often causes the nozzle to be clogged by drying of the paint. After stopping the automation line, the operator had to replace the nozzle manually.

In order to solve the problem that the paint is easily cured in the spray nozzle as described above, a coating film inhibitor for preventing the coating film from being easily cured for a predetermined time is used when the aqueous coating film for marking is formed.

When the amount of the coating film forming inhibitor applied to form the aqueous coating material for marking is less than 0.5% by weight, there is a problem in that the film forming inhibitory power is reduced and clogging of the nozzle occurs. When the amount of the coating film forming inhibitor is more than 2% by weight, the formation of the marking aqueous coating film is very excellent, but the amount of the aqueous coating material is absorbed by the punched paper, which is attached to the steel sheet upon removal of the punched paper. The problem of bad and bad marking.

As the above-described coating film forming inhibitor, a hydrophilic solvent, butyl cellulose solution, ethyl cell solution, propylene glycol monomethyl ether, N-methylpyrrolidone, etc. may be used. Aromatic hydrocarbon-based mixed solvents such as 100 and KOCOSOL-150, and dioctyl phthalate and dibutyl phthalate, which are used as plasticizers with plasticity, can be used. In addition, natural oils such as cottonseed oil, soybean oil and palm oil may also be applied as coating inhibitors.

That is, according to the type and content of the film forming inhibitor, the absorption of the perforated paper is less absorbed with the drying delay rate of the coating film, and the removal of the perforated paper is performed smoothly, and the marking and the marking can be selected and used. Here, in the case of the hydrophilic solvent is good self-miscibility, but this decreases the inhibitory ability of the coating film formation, aromatic mixed solvents and plasticizers have good ability to inhibit the coating film formation, but the perforated paper is fast absorption rate, marking the perforated paper by air adsorption When the paint is removed, some of the paint is absorbed, and the marking defect occurs due to the part of the punched paper stuck to the steel sheet and not falling off well.

Therefore, natural oils are suitable as the coating film forming inhibitor applied to the present invention. This is because the natural oil not only has a film forming inhibitory power but also has a low adsorption degree of the paint on the paint, so that smooth removal is possible when the punched paper is removed, thereby showing good workability and excellent marking quality.

In addition, the thixotropy index value (TI Index) is an important factor in the aqueous coating material for marking when working with a spray.

If the thixotropy index value of the water-based paint for marking is less than 3, there is a problem in that the amount of paint is less and the marking is insufficient, and if it exceeds 5, the amount of discharge is large because the viscosity drops relatively much when spraying. Due to the large amount of paint sticking to the perforated species itself, a problem arises that the removal of the perforated paper is not easy.

Therefore, in order to adjust the thixotropy index value of the aqueous coating material for marking, an associated polyurethane thickener, which is a 5-15 wt% thickener, should be used. When the amount of the associated polyurethane thickener is less than 5% by weight, the thixotropy index pack has a problem of exceeding 5, and when the amount of the thixotropy index is greater than 15, the thixotropy index value is less than 3. .

Hereinafter, embodiments of the present invention will be described in detail.

Example 1

8.5 wt% water, 3 wt% cryoprotectant (ethylene glycol), 0.3 wt% wet dispersant (polyoxyethylene alkyl ether), 1.5 wt% dispersant (polycarboxylate), 0.2 wt% preservative (isothiazolinone mixture) %, Defoamer (Foamax 810) 0.2% by weight, and then stirred, 50% by weight of pigment (Tie Pure R-902) was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (Norsion-0058), 1% by weight of the anti-film forming agent (cotton seed oil), and an antifoaming agent (Foamax 810) ) 0.1% by weight and 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 10 wt% of the association type urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Example 2

8.5 wt% water, 3 wt% cryoprotectant (ethylene glycol), 0.3 wt% wet dispersant (polyoxyethylene alkyl ether), 1.5 wt% dispersant (polycarboxylate), 0.2 wt% preservative (isothiazolinone mixture) %, Defoamer (Foamax 810) was added 0.2% by weight and stirred, and then 60% by weight of pigment (Tie Pure R-902) was added and stirred at a high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 10% by weight of the acrylic emulsion resin (Norsion-0058), 1% by weight of the anti-film forming agent (cotton seed oil), and an antifoaming agent (Foamax 810) ) 0.1% by weight and 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 15% by weight of the associated urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Example 3

8.5 wt% water, 3 wt% cryoprotectant (ethylene glycol), 0.3 wt% wet dispersant (polyoxyethylene alkyl ether), 1.5 wt% dispersant (polycarboxylate), 0.2 wt% preservative (isothiazolinone mixture) %, Defoamer (Foamax 810) was added 0.2% by weight, and after stirring, 37% by weight of pigment (Tie Pure R-902) was added and stirred at a high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 38% by weight of the acrylic emulsion resin (Norsion-0058), 1% by weight of the anti-film forming agent (cotton seed oil), and an antifoaming agent (Foamax 810) ) 0.1% by weight and 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 15% by weight of the associated urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Example 4

8.5 wt% water, 3 wt% cryoprotectant (ethylene glycol), 0.3 wt% wet dispersant (polyoxyethylene alkyl ether), 1.5 wt% dispersant (polycarboxylate), 0.2 wt% preservative (isothiazolinone mixture) %, Defoamer (Foamax 810) 0.2% by weight, and then stirred, 50% by weight of pigment (Tie Pure R-902) was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (Norsion-0070), 1% by weight of the anti-film forming agent (cotton oil), and an antifoaming agent (Foamax 810) ) 0.1% by weight and 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 15% by weight of the associated urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Example 5

8.5 wt% water, 3 wt% cryoprotectant (ethylene glycol), 0.3 wt% wet dispersant (polyoxyethylene alkyl ether), 1.5 wt% dispersant (polycarboxylate), 0.2 wt% preservative (isothiazolinone mixture) %, Defoamer (Foamax 810) 0.2% by weight, and then stirred, 50% by weight of pigment (Tie Pure R-902) was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (Norsion-0058), 1% by weight of the anti-film forming agent (cotton seed oil), and an antifoaming agent (Foamax 810) ) 0.1% by weight and 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 15% by weight of the associated urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Example 6

8.0% by weight of water, 3% by weight of cryoprotectant (ethylene glycol), 0.3% by weight of wet dispersant (polyoxyethylene alkyl ether), 1.5% by weight of dispersant (polycarboxylate), 0.2% of preservative (isothiazolinone mixture) %, Defoamer (Foamax 810) 0.2% by weight, and then stirred, 50% by weight of pigment (Tie Pure R-902) was added and stirred at high speed.

Subsequently, after confirming that the dispersity of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (Norsion-0058), 1.3% by weight of the anti-film forming agent (cotton seed oil), and an antifoaming agent (Foamax 810) ) 0.1% by weight and 0.4% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 15% by weight of the associated urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Comparative Example 1

8.5% by weight of water, 3% by weight of ethylene glycol, 0.3% by weight of polyoxyethylene alkyl ether, 1.5% by weight of dispersant, 0.2% by weight of preservative, and 0.2% by weight of antifoaming agent (Foamax 810) were added, followed by stirring. 50 wt% was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (NOROGE-0058), 1% by weight of cottonseed oil, and 0.1% by weight of an antifoaming agent (Foamax 810) And 4.2% by weight of water was added and stirred sufficiently.

Subsequently, after the contents were sufficiently mixed, 6% by weight of a hydroxyethyl cellulose thickener was added and stirred to obtain an aqueous coating material for marking.

Comparative Example 2

8.5% by weight of water, 3% by weight of ethylene glycol, 0.3% by weight of polyoxyethylene alkyl ether, 1.5% by weight of dispersant, 0.2% by weight of preservative, and 0.2% by weight of antifoaming agent (Foamax 810) were added, followed by stirring. 50 wt% was added and stirred at high speed.

Subsequently, after confirming that the dispersity of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (NOROGE-0058), 1% by weight of cottonseed oil, 0.1% by weight of an antifoaming agent (Foamax 810) and 4.2% by weight of water was added and the mixture was sufficiently stirred.

Subsequently, after the contents were sufficiently mixed, 6 wt% of the association type urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Comparative Example 3

8.5% by weight of water, 3% by weight of ethylene glycol, 0.3% by weight of polyoxyethylene alkyl ether, 1.5% by weight of dispersant, 0.2% by weight of preservative, and 0.2% by weight of antifoaming agent (Foamax 810) were added, followed by stirring. 50 wt% was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (NOROGE-0058), 1% by weight of butyl cellulsolve, and 0.1% of antifoaming agent (Foamax 810) % And 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 10 wt% of the association type urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Comparative Example 4

8.5% by weight of water, 3% by weight of ethylene glycol, 0.3% by weight of polyoxyethylene alkyl ether, 1.5% by weight of dispersant, 0.2% by weight of preservative, and 0.2% by weight of antifoaming agent (Foamax 810) were added, followed by stirring. 50 wt% was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (Norsion-0058), 1% by weight of dioctyl phthalate, and 0.1% of an antifoaming agent (Foamax 810) % And 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 10 wt% of the association type urethane thickener was added and stirred to obtain an aqueous coating material for marking.

Comparative Example 5

8.5% by weight of water, 3% by weight of ethylene glycol, 0.3% by weight of polyoxyethylene alkyl ether, 1.5% by weight of dispersant, 0.2% by weight of preservative, and 0.2% by weight of antifoaming agent (Foamax 810) were added, followed by stirring. 50 wt% was added and stirred at high speed.

Subsequently, after confirming that the dispersion degree of the mixture formed by the stirring was 7 or more of Hegman's particle size, 25% by weight of the acrylic emulsion resin (NOROGE-0058), 1% by weight of Cocosol-100, and an antifoaming agent (Foamax) 810) 0.1% by weight and 0.2% by weight of water were added and stirred well.

Subsequently, after the contents were sufficiently mixed, 10 wt% of the association type urethane thickener was added and stirred to obtain an aqueous coating material for marking.

 Examples and Comparative Examples Paint Formulation Table Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Water (H ₂ O) 8.5 8.5 8.5 8.5 8.5 8.0 8.5 8.5 8.5 8.5 8.5 Ethylene glycol 3 3 3 3 3 3 3 3 3 3 3 Polyoxyethylene alkyl ether 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 Polycarboxylate 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Isothiazolinone Mixture 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 FOAMAX 810 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Typure R-902 50 65 37 50 50 50 50 50 50 50 50 PRESSURE-0058 25 10 38 - 25 25 25 25 25 25 25 PRESSURE-0070 - - - 25 - - - - - - - Associative Urethane Thickener 10 10 10 10 10 10 - 6 10 10 10 Hydroxyethyl cellulose - - - - - 6 - - - - Butyl Cellosolve - - - - - - - One - - Dioctylphthalate - - - - - - - - One - Kocosol-100 - - - - - - - - - One Cottonseed oil One One One One 0.3 1.3 One One - - - FOAMAX 810 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Water (H ₂ O) 0.2 0.2 0.2 0.2 0.9 0.4 4.2 4.2 0.2 0.2 0.2 Sum 100 100 100 100 100 100 100 100 100 100 100

Hereinafter, the physical properties and characteristics of the aqueous coating material for marking prepared by Examples 1 to 6 and Comparative Examples 1 to 5 of the present invention were described in Experimental Examples 1 to 4 below.

Experimental Example 1

Appearance, specific gravity, viscosity, particle size and non-volatile content of each of the aqueous coating material for marking prepared by Examples 1 to 6 and Comparative Examples 1 to 5 were measured by the following method. The results are shown in Table 2.

Basic Properties of Examples and Basic Examples Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 (1) appearance / color White liquid White liquid White liquid White liquid White liquid White liquid White liquid White liquid White liquid White liquid White liquid (2) in the rain 1.44 1.44 1.52 1.37 1.44 1.43 1.44 1.43 1.44 1.44 1.44 (3) viscosity (KU) 84 100 74 85 84 84 83 84 84 84 84 (4) particle size (NS) 7 or more 7 or more 7 or more 7 or more 7 or more 7 or more 7 or more 7 or more 7 or more 7 or more 7 or more (5) Non-volatile matter 65 71 57 65 65 65 62 63 65 65 65 Storage stability (5) room temperature +1 KU +1 KU +1 KU +1 KU +1 KU +1 KU +1 KU +1 KU +1 KU +1 KU +1 KU (6) 60 ℃ +1 KU +2 KU +1 KU +1 KU +1 KU +1 KU +7 KU +1 KU +1 KU +1 KU +1 KU

Experimental method of Experimental Example 1

(1) Appearance / Color: Visually Observed

(2) Viscosity (KU): The paint was kept at 25 ° C and measured with a Krebs-Stormer viscometer.

(3) Particle size (NS): The paint was measured using a Hegman particle size meter.

(4) Non-volatile content (%): 1 g of the coating material was measured by heating at 105 ° C. for 3 hours.

(5) Storage stability at room temperature (ΔKU): Stored at 25 ℃ for 30 days and measured the difference between the initial KU viscosity.

(6) Storage stability at 60 ° C. (ΔKU): Stored at 60 ° C. for 7 days and the difference between initial KU viscosity was measured.

Experimental Example 2

Each of the marking aqueous paints prepared in Examples 1 to 4 were coated with a thickness of about 100 μm on a 10T iron plate by airless spray for each temperature, and then the appearance was observed. The adhesion was dried and subjected to a scratch test with a 10 won coin. Good and bad was judged as falling to the coating film outside the scratch trajectory. The results are shown in Table 3.

Appearance and Adhesion by Temperature according to Changes in Resin Contents and Kinds and Pigment Contents Item Example 1 Example 2 Example 3 Example 4 Coating appearance by body temperature Room temperature Good Good Good Bad 100 ℃ Good Good Good Good 200 ℃ Good Good Boiling Good 300 ℃ Good Good Boiling Good Adhesion Good Bad Good Good

Looking at Table 3 shown in Experimental Example 2, the appearance by drying temperature showed a good appearance in the coating film of Example 1 and Example 2, in the case of Example 3, the content of the resin is 38% by weight marking at high temperature Boiling phenomenon of the paint occurred during the forming process. In addition, in the case of Example 4, cracks were generated in the coating film at room temperature marking because of using the pressurization-0070 having a high minimum coating film formation temperature instead of the NOUS-0058.

And, in the case of adhesion, Examples 1, 3, and 4 showed good results, but in Example 2, due to the high content of the pigment at 65% by weight, the resin was relatively lowered to 10% by weight, resulting in poor adhesion. Seemed.

Experimental Example 3

Using the aqueous coating material for markings prepared in Examples 1, 5, 6 and Comparative Examples 3 and 4, the clogging properties of the nozzles and the perforated species were tested, and the results are shown in Table 4.

Nozzle Clogging and Perforated Paper Absorption Test According to Type and Content of Coating Inhibitor Item Example 1 Example 5 Example 6 Comparative Example 3 Comparative Example 4 Comparative Example 5 Nozzle clogging Good Bad Good Good Good Good Perforated Paper Absorbent Good Good Bad Bad Bad Bad

 Looking at Table 4 shown in Experimental Example 3, the nozzle clogging showed good results irrespective of the type of the film forming inhibitor except for the case of Example 5 having a cotton thread content of 0.3% by weight. In the case where the perforated species is absorbent, only the examples 1 and 5 in which cottonseed oil is used in an amount of 1% by weight or less among the types of the film forming inhibitors show good results. That is, in Example 6 using 1.3% by weight of cottonseed oil and Comparative Examples 3 to 5, which are different from each other, the absorbents showed poor absorbency and poor results.

The nozzle clogging property is a laboratory measurement of the paint so that the paint on the end of the nozzle is not dried within a certain time when applying the field line of the paint does not interfere in the next airless operation, the test method is a 3mm applicator ( After coating for 10 minutes at 40 ° C after coating with an applicator), the water droplets were dropped, and after 10 seconds, the finger was rubbed to measure the degree of loosening of the coating film. Here, it was judged that it is good if the coating film was loosened well, and it was judged to be bad if the coating film was not loosened.

Absorption test of the perforated paper is to place the perforated paper on each 10T iron plate of each paint, and if the paper is removed after 3 seconds after coating with a # 24 bar coater (bar coater) whether the marking letters bleeding due to the paper wet or not Good and bad was identified as.

Experimental Example 4

TI INDEX values of the aqueous coating materials for marking prepared in Examples 1 and Comparative Examples 1 and 2 and the discharge amount of the coating materials were measured. The results are shown in Table 5.

TI INDEX and Discharge Rate According to Type and Content of Thickener Example 1 Comparative Example 1 Comparative Example 2 TI INDEX 4.1 5.1 2.8 Discharge amount (ℓ / min.) 0.62 0.75 0.49

Referring to Table 5 shown in Experimental Example 4, in the case of Example 1 using 10% by weight of the association type urethane thickener, the discharge amount is appropriate, the marking quality is good, and even after the marking, the process of removing perforated paper by air suction is not good. There was no. In Comparative Example 1 using the hydroxyethyl cellulose, the TI INDEX value was increased, and the amount of paint discharged accordingly increased. Thus, when the punched paper was removed by air suction, the punched paper fell beyond the allowable weight of the inhaler, resulting in a defect. On the other hand, in Comparative Example 2 using the associative type urethane thickener 6% by weight, there was a disadvantage in that the marking amount was not clear.

The TI INDEX value of the paint was measured at 6 rpm and 60 rpm, respectively, using a Burgfield viscometer. The viscosity measured at 6 rpm is divided by the 60 rpm measurement viscosity. The closer this value is to 1, the more the flow characteristic of Newtonian fluid is. Marking paint discharge amount is measured by placing punched paper on 10T iron plate at 100kgf / ㎠ pressure using airless spray gun (standard NT2504) and nozzle diameter 0.36mm of IWATA, and measuring the amount of paint discharged after operating for a certain time. .

Based on the above experimental results, in Example 1 using 25% by weight of an emulsion resin having a minimum film forming temperature of 10 ° C. or less and 50% by weight of titanium dioxide pigment, the appearance and adhesion of each drying temperature were excellent.

In addition, when the clogging properties of the nozzle and the perforated species were absorbent in terms of workability, cotton yarn oil was not only better but also in Example 1 containing 1% cotton yarn oil.

In addition, in the case of the paint discharge amount which affects the sharpness of marking and the removal process of perforated species, in Example 1 using the associated urethane thickener, the discharge amount was appropriate, so that the marking quality was excellent and the perforated paper was easily removed. In the case of Comparative Example 1 using a large TI INDEX, a relatively large amount of paint is discharged, the marking is clear, but there is a problem that the punched species are not easy to remove.

In addition, in the case of Comparative Example 2 using 6% by weight of the associated thickener, it was easy to remove the perforated paper, but it was confirmed that the marking was not clear due to the small amount of paint discharge due to the relatively small TI INDEX value.

As described above, the manufacturing method of the marking aqueous coating according to the present invention uses an emulsion resin having a low minimum film forming temperature and controls the content of the resin and the pigment so that the coating film is cracked or formed in the coating process at room temperature at 300 ° C. Not only does it occur, it also has excellent adhesion.

In addition, by controlling the content of cottonseed oil as a film forming inhibitor, the perforated species for the clogging and marking quality of the nozzle in terms of workability was enabled.

In addition, the spray nozzle is prevented from clogging during the repetitive coating process, and the appropriate amount of the associated urethane thickener is applied, so that the proper amount of the discharge amount of the paint is controlled so as not to affect the quality of the marking and the removal of perforated species in the working process. It is possible.

As described above, the present invention has been described with reference to the preferred embodiments and comparative examples, but those skilled in the art will recognize the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be understood that various modifications and changes can be made.

Claims (9)

(a) 7 to 14% by weight of water, 1 to 4% by weight of a dispersant comprising polycarboxylate , 2 to 4% by weight of an adjuvant comprising a freeze stabilizer, a wet dispersant, an antiseptic and an antifoaming agent and 37 to 65% by weight of a pigment To form a first mixture; (b) 15 to 35 % by weight of the acrylic emulsion resin having a minimum coating film formation temperature of 0 to 10 and a solid content of 40 to 45% by weight when the dispersion degree of the first mixture is Hegman particle size of 7 or more ; Forming a second mixture by mixing 0.5 to 1.5 wt% of a film forming inhibitor including a hydrophilic solvent or natural oil and an additive including an antifoaming agent and water ; And (c) a method for preparing an aqueous coating material for marking having a thixotropy index value of 3 to 5, comprising the step of adding 5 to 15% by weight of the associated urethane thickener to the second mixture to form an aqueous coating material for marking. delete delete The method for producing an aqueous coating material for marking according to claim 1, wherein the pigment is a titanium dioxide pigment having a rutile type crystal. The method of claim 1, wherein the hydrophilic solvent comprises at least one selected from the group consisting of butyl cellulsolve, ethyl cellulsolve, propylene glycol monomethyl ether, N-methylpyrrolidone, the natural oil is cottonseed oil, palm oil, soybean oil Method for producing an aqueous coating material for marking, characterized in that it comprises at least one from the group consisting of. delete delete delete delete