KR101795891B1 - Paint Composition for Detecting Acid Having Discoloration Performance to Acid Leakage and Method for Preparing Thereof - Google Patents

Abstract

The present invention relates to a coating composition comprising 25 to 70% by weight of an epoxy ester-modified resin, 1-25% by weight of acrylic resin; And 5 to 50% by weight of a color change pigment for acid detection, and a method for producing the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint composition for acid detection having a discoloration performance due to acid leaching,

The present invention relates to a coating material for forming a coating film which is coated with a brush coating, a roller coating or a spray coating on a new material and a place where a conventional organic dry coating film is formed, The present invention relates to a coating composition for acid detection and a method for producing the same.

Typical conditions that can be monitored using color changes include physical conditions such as water presence and chemical conditions, such as pH changes. Typical consumer products that can be more effective by containing suitable color fading compositions and which can give more benefits to the end user include container transportation means, piping etc. using various acids, in which a suitable color detecting agent is applied If you can get a great effect. In addition, products that can be applied for safety by the end user in preparation for leakage of various acids include test products and industrial products.

Color detectors are well known and available in various forms. The preferred performance characteristics are durability (such as wetting by water, wetting by sunlight, discoloration by sunlight, etc.) and good retentivity (i.e., the color detector remains intact and does not leach into other components of the product in which it is being used ), And it shall be possible to implement the required color according to the installation location of the substrate and the required characteristics.

Japanese Unexamined Patent Publication (Kokai) No. 2006-090971 (published on Mar. 04, 2006) discloses a basic gas or acid gas detection paint having good color development and color durability as a prior art having a discoloring performance for an acid component. However, the conventional techniques still have problems in terms of workability, adhesion, storage stability and coating film durability of the coating composition.

Thus, there is a continuing need for the development of compositions that are durable, have good retention properties, and exhibit rapid and dramatic discoloration when the compositions are used in products. Further, since the purpose of the composition is to detect the leakage, it is required to have a composition that is wettable but water-resistant and water-insoluble. Also, there is a need for compositions in liquid form that can be applied, e.g., by painting, at room temperature so that the composition can be easily applied to the desired components of the article without heating. Thus, the inventors of the present invention have completed the present invention after a considerable period of research.

Japanese Laid-Open Publication No. 2006-090971 (published April 2006, 2006)

The present invention is used for improving the protection of the material and improving the beauty of the material as in the case of the general paint, and it maintains quick drying and adhesion, and has durability and good retention property so that the existing acid detecting material (adhesive type, pH paper) Eliminating the need for protection from moisture that has occurred; It is possible to realize various colors required according to the use of the substrate, unlike the conventional detecting material which can realize only predetermined colors (yellow to red, colorless to red, etc.); And to provide a coating composition for acid detection which has little discoloration due to sunlight during outdoor application due to its excellent durability.

Therefore, the acid detecting coating composition of the present invention can be used not only as a protective coating for new chemical equipments and existing facilities, but also as a safety manager and a worker for recognizing the leakage of acidic substances, It can be effectively applied to a place where a chemical facility requiring an effect is operated.

One embodiment of the present invention relates to a coating composition comprising 25 to 70% by weight of an epoxy ester-modified resin, 1-25% by weight of acrylic resin; And 5 to 50% by weight of a color change pigment for acid detection.

The epoxy ester-modified resin has a number average molecular weight of 500 to 20,000 and can be represented by the following formula (1).

[Chemical Formula 1]

n is 1-7.

In addition, the color change pigment for acid detection may include a polymer colorant.

The polymeric colorant may also be selected from the group consisting of phthalocyanine blue, ferrocyan blue, cobalt blue, ultramine blue, copper carbonate blue, bromocresol green, bromophenol blue, bromochlorophenol blue, tetrabromophenol blue, There is provided a method for preparing a colorant composition comprising a colorant selected from the group consisting of green, brilliant green, methyl yellow, naphthol yellow S, alizarin yellow GG, thiazole yellow G, alizarin yellow R, morganth orange I, tropaeolin O, The present invention relates to a method for producing a cyanuric acid derivative of the formula (I), wherein the red, cadmium lithol red, rake red, camine red, cadmium red, quinacridone red, chromophthalal, ultramarine red, congo red, methyl red and allure red AR, cobalt violet, Marine violet, perorite violet, quinacridone violet, dioxazine violet, gentian violet (Methyl violet), anatase type titanium dioxide, rutile type titanium dioxide, and derivatives thereof.

In addition, the acid detecting coating composition of the present invention is characterized in that it comprises 1 to 5% by weight of a polymer dispersant based on the total weight of the coating composition, 0.1 to 2% by weight of a catalyst, 0.1 to 2% by weight of a defoamer, 0.1 to 2% 1 to 5% by weight, and 0.5 to 10% by weight of a storage stabilizer.

Another embodiment of the present invention is a composition comprising a) 25-70% by weight of an epoxy ester modified resin, 1-25% by weight of an acrylic resin, and 5-50% by weight of a color change pigment for acid detection, based on the total weight of the coating composition step; And b) adding a solvent to the mixture prepared from the step a) and mixing the mixture.

In addition, the method for producing a coating composition for acid detection of the present invention may further comprise a step of pulverizing the mixture prepared from the step a).

The epoxy ester-modified resin has a number average molecular weight of 500 to 20,000 and can be represented by the following formula (1).

[Chemical Formula 1]

n is 1-7.

In step a), 1 to 5% by weight of a polymer dispersant based on the total weight of the coating composition and 0.5 to 10% by weight of a storage stabilizer may be further added and mixed.

In step b), 0.1 to 2% by weight of a catalyst may be further added based on the total weight of the coating composition.

Further, another embodiment of the present invention provides a coating film formed from the coating composition.

The coating composition for acid detection having the discoloring performance according to the acid leaching according to the present invention is characterized in that when the coating film is physically or chemically exposed to an acid, erosion of the oxidation-drying type epoxy ester- The color appearance of the coating film is changed.

In addition, the conventional method is difficult to apply directly to an industrial site due to film-type or panel-type acid detection materials, and maintenance costs are continuously generated. However, the acid detecting coating composition having the discoloring performance according to the acid leakage according to the present invention can provide excellent workability as compared with the conventional method, and can maintain adhesion and durability. Furthermore, since the effect of the plaster as a conventional paint is given to the function of detecting the safety of the acid leakage, it is possible to prevent a large accident caused by the leakage of the acidic material, which is excellent in safety management on the site.

1 shows the discoloration characteristics (30 sec, 60 sec, 90 sec, 3 min, 5 min) according to the pickling time with time after coating.

TECHNICAL FIELD The present invention relates to a coating composition for acid detection comprising a color change pigment for acid detection and a water-insoluble film-forming polymer. Unlike the coating compositions of the prior art, the coating compositions of the present invention are fluid at room temperature while maintaining the performance of plastics due to the protection performance of the base material of conventional coating materials and the required hue of the required colors, and various paints such as brushes, rollers, It is excellent in workability in tools and can be repaired at any time if necessary. It can be applied to substrates by naturally drying in air with one-component type (not curing agent). This aspect of the coating composition of the present invention makes it easier to handle the coating composition during manufacture of the article to which the coating composition is applied. Further, the coating composition of the present invention provides good adhesion when a coating film is formed on a substrate and prevents cracking.

The coating composition for acid detection of the present invention includes a color-changing pigment for acid detection and a water-insoluble film-forming polymer which are discolored when exposed to various acids physically or chemically. When the coating film formed by the coating composition of the present invention is physically or chemically exposed to various acids, the color appearance of the coating film may be changed by the erosion of the oxidation-drying type epoxy ester-modified resin and the color change coating composition for acid detection.

Further, the acid detecting coating composition includes a coating film forming component or a substrate forming component. The film-forming component is generally referred to as a water-insoluble film-forming polymer and a color-changing pigment for acid detection, and forms a coating film that keeps the color-changing pigment for acid detection, a dispersant, a storage stabilizer and a pH stabilizer close to each other. When the coating film on the substrate is in a state of being coated, the coating film forming component of the present invention is wettable but water insoluble. This feature makes the coating composition desirable for use in articles where the composition is exposed to wetting. Further, a coating composition having durability and resistance to leaching outward due to its water-insoluble nature can be obtained.

Preferably, the water-insoluble film-forming polymer and other varnish components may be dissolved in an organic solvent prior to application to the substrate. The water-insoluble film-forming polymer may be dissolved in a volatile organic solvent such as ethanol, acetone, methanol, acetate, benzene, toluene, and mixtures thereof. The water-insoluble film-forming polymer is solid after drying but can be dissolved in volatile organic solvents or organic mixed solvents, and the acid pickling coating composition is liquid at room temperature.

Also suitable water-insoluble film forming polymers for use in the present invention may be selected from copolymers of acrylates, amides, polyurethanes, epoxies, esters and fatty acids. Preferably, the water-insoluble film-forming polymer of the present invention is a copolymer of an epoxy and a fatty acid or a copolymer of an acrylate and a polyurethane.

In addition, suitable film-forming varnish materials may be polymeric materials or a mixture of oligomers and polymers.

The primary function of the acid detecting coating composition comprising the film-forming component of the present invention is to effectively adhere the composition to the substrate to prevent the composition from falling off the substrate upon drying. In addition, the secondary function is to increase the wettability of the coating composition for acid detection by rapid erosion when the coating film is exposed to fluid and gaseous acid, so that it changes color and responds to various acids or acids for a specific physical or chemical condition .

More specifically, the coating film forming component includes a rubidic epoxy ester-bonded epoxy resin which is a component capable of being surface-modified (rusted) by an acid. In addition, the coating composition of the present invention comprises an acrylic resin together with the above-mentioned epoxy ester-modified resin.

Accordingly, in one embodiment, the coating composition of the present invention comprises 25-70 wt% of an epoxy ester-modified resin based on the total weight of the coating composition, 1-25 wt% of an acrylic resin, and 5-50 wt% of a color change pigment for acid detection .

The coating composition of the present invention preferably contains an epoxy ester-modified resin in an amount of 25 to 70% by weight based on the total weight of the coating composition. And more preferably 30 to 50% by weight of an epoxy ester-modified resin. If the content of the epoxy ester-modified resin is less than 25% by weight, the coating composition may be detached. If the content exceeds 70% by weight, the drying time of the coating composition may be delayed.

INDUSTRIAL APPLICABILITY The acid detecting coating composition of the present invention is a one-pack type naturally drying type excellent in workability and adhesion, and includes an epoxy ester-modified resin represented by the following formula (1) with a number average molecular weight of 500 to 20,000.

[Chemical Formula 1]

n is 1-7.

The epoxy ester modified resin imparts flexibility to the coating composition for acid detection of the present invention, and the number average molecular weight is preferably 500 to 20,000 or more preferably 1,000 to 3,000. If the number average molecular weight is less than 500, the final coating composition tends to be brittle. When the number average molecular weight exceeds 20,000, dryability is deteriorated due to rapid drying.

In particular, the epoxy resin has an epoxy equivalent of 300 to 3,500, preferably 900 to 3,000, and a solid content of 55% or less, preferably 50 %. ≪ / RTI > For example, epoxy YD 011, YD 014, YD 017 resin and the like can be used. Depending on the type of epoxy resin, there are many differences in adhesion and acid erosion.

The fatty acid may be a fatty acid having 8 to 20 carbon atoms, preferably 8 to 18 carbon atoms, more preferably at least one of coconut fatty acid, dihydrate castor oil fatty acid, soybean oil fatty acid, Can be used.

In addition, the acrylic resin of the present invention is not particularly limited and has a number average molecular weight of 500 to 20,000, preferably having properties to adjust the dryness of the epoxy ester resin.

Preferably, the acrylic resin may be 5-20% by weight based on the total weight of the coating composition. When the amount is less than 5% by weight, the drying is delayed and the durability (corrosion resistance) is impaired. When the amount is more than 20% by weight, the drying is accelerated and the adhesion is deteriorated.

In addition, the acid detecting coating composition of the present invention may contain a nitrocellulose-based resin in addition to an epoxy ester-modified resin or a phenol-modified epoxy resin. If it is included, it is easy to use in the form of can spray. It is also believed that such film-forming polymers can improve the adhesion of the coating composition to the substrate.

Further, the acid detecting coating composition of the present invention contains a coating film forming component of 31 wt% or more of the total weight of the coating composition. Preferably, the acid detecting coating composition of the present invention comprises a coating film forming component in an amount of 31 to 70% by weight based on the total weight of the coating composition.

Further, the color change pigment for acid detection includes a coloring agent and a pigment which can change color in response to the presence of a fluid, a gas, and the like. Preferably, the water-insoluble film-forming polymer of the present invention is corroded by an acid, the coloring agent and the pigment in the coloring pigment for acid detection are discolored by the acid, and the pH adjusting agent of the present invention is adjusted , And has a discoloration performance due to acid leakage.

In addition, the acid detecting coating composition of the present invention comprises a functioning colorant, preferably a colorant which is discolored by an acid. The colorant may be a neutral colorant, an acidic colorant or a basic colorant. Preferably, the colorant discolors at a pH of less than 5.5. Discoloration can occur from color to colorless, or from one color to another.

The colorant has a chromophore structure or a functional group derivatized at the pendant group. Further, the colorant may be a polymer colorant. Suitable colorants for use in the present invention include phthalocyanine blue, ferrocyan blue, cobalt blue, ultramine blue, copper carbonate blue, bromocresol green, bromophenol blue, bromochlorophenol blue, tetrabromophenol blue, Methyl orange, methyl orange, methyl orange, methyl orange, naphthol yellow S, alizarin yellow GG, thiazole yellow G, alizarin yellow R, morganth orange I, tropahedrine O, orange G, acidic fuchsin, methyl orange, ethyl orange , Rubin red, cadmium lithol red, rake red, camine red, cadmium red, naphthol red, quinacridone red, chromophthalal, ultramarine red, Congo red, methyl red and allure red AR, cobalt violet, Violet, ultramarine violet, perorite violet, quinacridone violet, dioxazine violet, Titanium dioxide, anatase-type titanium dioxide, rutile-type titanium dioxide, and derivatives thereof.

The acid detecting coating composition of the present invention may contain two or more coloring agents. 2 When more than one colorant is used, the colorant can be selected based on the desired color (e.g., different colors, better visibility, etc.). For example, two or more colorants having visually different colors may be combined, or colorants having visually the same color may be combined.

Also, since the color change pigment for acid detection affects hue, hiding power and workability, it is important to maintain an appropriate content range in the coating composition. Preferably, in the present invention, 5 to 50% by weight, preferably 10 to 40% by weight, more preferably 20 to 40% by weight, of the coloring pigment for acid detection in the entire coating composition containing the coloring agent and the pigment As the content. If the content of the color change pigment for acid detection is less than 5% by weight, a sufficient hiding effect can not be obtained. If the content is more than 50% by weight, dispersion and storage stability of the coating composition deteriorate.

In addition, the acid discoloring pigments of the present invention include pigments selected from the group consisting of soluble low toxicity pigments, coloring and extender pigments, and mixtures thereof. At this time, it is necessary to use a product having low oil absorption and excellent weather resistance as a pigment, and use of some organic pigments can reduce the total pigment usage.

The acid detecting coating composition of the present invention may further comprise at least one selected from the group consisting of a polymer dispersant, a storage stabilizer, a pH adjuster, a catalyst, a defoamer, a material spreading improver, a sedimentation inhibitor, a drying promoter, .

As the polymer dispersing agent, any dispersing agent known to be usable in the coating composition may be used, and it is not particularly limited to the kind thereof. The acid detection coating composition of the present invention may contain a dispersant, preferably a dispersant of opposite charge attracting a positively or negatively charged colorant. It is believed that the dispersing agent plays a dual role in the acid detecting coating composition. One thing is that the dispersing agent adjusts the wettability of the composition so that the fluid or gas can penetrate the composition and change the pH, resulting in discoloration of the coloring agent. The second point is that the dispersant component forms a charge / charge complex with the colorant, so that the colorant is exposed to the composition and the maximum color change occurs.

One numerical value showing the performance of the acid detecting coating composition of the present invention is the reaction time. The reaction time can be improved by increasing the wettability of the coating composition, i.e. by increasing the amount of dispersant, so that the fluid and gas can penetrate more quickly. However, if the amount of dispersant is increased, the stability of the coating composition may be reduced, especially under elevated temperature and humidity conditions. On the other hand, when a neutral dispersant is used, the wettability can be increased without affecting the stability of the coating composition. Therefore, by using the neutral dispersant and the charged dispersant in the acid detecting coating composition, a composition having improved wettability and good stability can be obtained.

The dispersing agent may also be an oligomer or polymer. Examples of suitable amounts of charged dispersant include acrylic or polydimethylsiloxane.

The acid detecting coating composition of the present invention comprises a dispersing agent in an amount of 1 to 10% by weight based on the total weight of the coating composition. Preferably, the acid detecting coating composition of the present invention comprises a dispersing agent charged with an opposite charge in an amount of 1 to 5% by weight of the total weight of the coating composition.

In addition, the coating composition according to the present invention may further comprise a storage stabilizer. Since the above-mentioned pigments have a specific gravity ranging from 2 to 5, they are heavy, so that the pigment may precipitate during storage of the paint, resulting in deterioration of physical properties of the paint composition and poor workability. The use of storage stabilizer in order to prevent precipitation of the pigment, and, typically, fume silica, organosilane knock-ray, bentonite, airgel 300 ^®, bentonite, airgel 972 ^®, Creighton ^®, Bentone 27 ^®, Bentone 34 ^®, Bentone 38 ^® And a mixture thereof.

The storage stabilizer may be contained in an amount of 0.1 to 10% by weight, preferably 1 to 3% by weight based on the total weight of the entire coating composition. If the content is less than 0.1 wt%, it is difficult to suppress the precipitation of the pigment. When the content is more than 10 wt%, it is preferable that the content is within the above range due to poor appearance due to lack of workability.

In addition, the pH adjusting agent may include a low molecular weight organic acid and a high molecular weight organic acid.

In another embodiment, the acid detecting coating composition of the present invention may include an organic solvent to facilitate application to a substrate. In other words, the film-forming component of the present invention may be dissolved or suspended in an organic solvent to be later evaporated. By this, when the mixture of the film-forming component and the organic solvent is formed, the mixture is liquid at room temperature. Further, the coating composition is applied onto the substrate, dried, and the volatile organic solvent is evaporated to form a coating film. Accordingly, another embodiment of the present invention provides a coating film formed from the coating composition.

The organic solvent of the present invention may be a single solvent or a mixture of solvents. The solvent used is one which can be mixed well with the resin to be used, and affects paint workability and paint properties such as coat appearance, foaming property, paint spreadability, dryness and the like. Particularly, it is necessary to use a solvent having a high volatilization rate because it is operated by natural drying, and when using only a solvent having a high volatility, a gelation phenomenon occurs during storage of the coating.

The solvent may be two or three kinds selected from the group consisting of ether-based and ketone-based ones having an evaporation boiling point of 100 ° C to 300 ° C. Representative examples include ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether acetate (cellosolve acetate), ethylene glycol monobutyl ether (butyl cellosolve), diethylene glycol monobutyl ether, propylene glycol monomethyl ether , Diethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, ethylene glycol butyl ether acetate, and mixtures thereof, and a mixed solvent thereof.

Preferably, as the diluting agent, butyl cellosolve, diacetone alcohol, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK) and the like can be used. As the reducing agent, toluene, xylene and the like can be used.

The preservative is contained in the total coating composition in an amount of 10 to 40% by weight, preferably 20 to 30% by weight. If the content is less than 10% by weight, bubbles and coating film gloss may be insufficient. If the content is more than 40% by weight, defective concealment and flow phenomenon may occur.

In addition, the coating composition according to the present invention may further comprise a curing catalyst. A catalyst such as lead (Pb), cobalt, manganese or calcium is used to replace the double bonds of the epoxy ester modified resin included in the coating composition of the present invention to accelerate curing, By weight, preferably 0.3 to 1% by weight. If the content is less than 0.1% by weight, the double bond is difficult to be substituted and the reaction does not progress. If the content is more than 2% by weight, a problem arises in stability during storage of the coating, Lt; / RTI >

Further, the coating composition may further contain additives such as a defoaming agent, a surface conditioner, and the like. The defoaming agent prevents air bubbles, adjusts the surface tension of the paint, and removes large and small bubbles that can occur during painting operations. If the bubbles can not be completely removed, the coating performance such as durability, corrosion resistance and water resistance are deteriorated as well as the appearance damage of the coating film, which has an important influence on the performance of the coating material. In addition, the surface modifier or surface spreading agent uses those known in the art to prevent spreading, foaming, surface conditioning and cratering.

On the other hand, the present invention provides a method of producing a coating composition for acid detection having a discoloration performance due to acid leakage. A) mixing 25-70% by weight of an epoxy ester-modified resin, 1-25% by weight of an acrylic resin, and 5-50% by weight of a color change pigment for acid detection, based on the total weight of the coating composition; And b) adding a solvent to the mixture prepared from step a) and mixing.

Further, the production process of the present invention may further comprise a step of pulverizing the mixture prepared from the step a).

Preferably, the epoxy ester-modified resin has a number average molecular weight of 500 to 20,000 and is represented by the formula (1).

[Chemical Formula 1]

n is 1-7.

In addition, the production method of the present invention may further comprise 1 to 5% by weight of the polymer dispersant and 0.5 to 10% by weight of the storage stabilizer in step a), and 0.1 to 2% by weight of the catalyst in step b) They can be further added and mixed.

As a result, the prepared coating composition for acid detection has a viscosity of 60-80 ku and a particle size of 25-40 mu m as measured by a creverse-stopper viscometer.

The coating composition for acid detection prepared by this method is excellent in adhesion and durability because it is painted on a base material and is capable of quickly detecting acid leaks when the acid quickly reacts to the acid to thereby take safety measures. .

Further, one embodiment of the present invention comprises applying the coating composition to a substrate. Also, the equipment can be assembled or installed after coating the parts at room temperature in advance before the facilities to which the paint composition for acid detection of the present invention is applied. Or may be applied on the coating film without removing the coating film already coated with another coating.

After the application step, the coating composition according to the present invention can be dried at room temperature. During the drying of the coating composition, the organic solvent evaporates in the coating composition to form a coating on the substrate. That is, the presence of an organic solvent may assist in applying the coating composition onto the substrate. After the coating composition is dried as a coating film on the substrate, the organic solvent remains with the coating film forming component.

The process of the present invention is more efficient and less costly than the conventional process because the coating composition can be applied to the substrate without heating at room temperature since the coating composition is liquid at room temperature.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

Example

Examples 1 to 3

A coating composition for acid detection was prepared with the composition shown in Table 1 below. First, a base material such as a rubidic epoxy ester resin and an acrylic resin, a polymer dispersant, and a storage stabilizer were added to the reactor, followed by stirring at a speed of 500 to 700 rpm for 30 minutes with a stirrer. Stirring was carried out until the particles of the mixture became 50 to 60 탆. The coloring agent and the extender pigment, which were discolored by the acid, were added thereto, stirred at 500 to 700 rpm for 30 minutes, and then dispersed using a dispersing machine (sand mill) And the size was kept at 30 탆 or less.

Next, a catalyst, a stabilizer and a preservative were added to the reactor and stirred at a speed of 500 to 700 rpm for 30 minutes. After stirring, a pH adjusting agent was added to prepare a coating composition for acid detection having a viscosity of 60 to 70 ku.

Comparative Example  1-3

A coating composition was prepared in the same manner as in the above Example except that the composition was changed as shown in Table 1 below.

The content of each composition in the coating compositions of Examples 1 to 3 and Comparative Examples 1 to 3 is as shown in Table 1 below. The unit is weight%.

Experimental Example

In order to measure the coating properties of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 3, a two-component epoxy paint for non-ferrous metal was spray coated to a thickness of 20 to 30 탆 on Stainless Steel 304, Spray coating was applied to a thickness of 20 to 30 탆, and after natural drying for 168 hours, physical properties were measured by the following methods.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Epoxy ester ¹ 40 40 40 50 - - Acrylic resin ² 10 10 10 - 10 - Polyester resin ³ - - - - 40 50 Colorant ⁴ 25 20 15 15 15 15 Extinct pigment ⁵ 10 15 20 20 20 20 Storage Stabilizer ⁶ 0.5 0.5 0.5 0.5 0.5 0.5 Polymer Dispersant ⁷ 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst ⁸ 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst ⁹ 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst ¹⁰ 0.2 0.2 0.2 0.2 0.2 0.2 Generation ¹¹ 5 5 5 5 5 5 Defoamer ¹² 0.3 0.3 0.3 0.3 0.3 0.3 Material spreading composition ¹³ 0.1 0.1 0.1 0.1 0.1 0.1 pH adjuster ¹⁴ 2 2 2 2 2 2 Conservative ¹⁵ 5.4 5.4 5.4 5.4 5.4 5.4

week)

1: Epoxy ester-modified resin: Number average molecular weight 500 to 20,000,

2: Acrylic resin: Number average molecular weight 500 to 20,000,

3: polyester resin: number-average molecular weight 500 to 20,000, dimmer self-

4: Colorants: titanium dioxide, ultramarine blue, cobalt violet, luthiolubin, carmine red, and the like.

5: extinct pigments: calcium carbonate, barium sulfate, talc, etc.

6: Storage stabilizer: Benton product

7: Polymer dispersant: high molecular weight block copolymer having pigment affinity functional group

8: Catalyst: 5% Cobalt

9: Catalyst: 24% Pb

10: Catalyst: 5% Mn

11: Genetic agent: methyl ethyl ketone, butyl acetate

12: Defoamer: silicone oil

13: Material spreadability Preparation: Polyether-modified polydimethylsiloxane liquid, acrylic copolymer

14: pH adjusting agent: organic acid

15: Preservative: xylene, toluene

Nonvolatile matter ( % )

[Equation 1]

Nonvolatile matter (%) = ((initial sample weight - volatile matter weight) / initial sample weight) × 100

Viscosity (Ku)

Lt; RTI ID = 0.0 > 25 C < / RTI > using a Stromer viscometer.

Particle Size (㎛)

Were measured with a particle size meter.

Dry ( Touch  tack-free)

Determine the tack-free time after application of the specified humidity film thickness 75 μm.

○: No phenomenon appearing within 10 minutes.

△: No phenomenon to appear within 20 minutes

X: a phenomenon that occurs even after 30 minutes or more has elapsed

Painting workability (bar coat & spray coat condition)

Good (?), Good (?) And poor (X) were judged by visual inspection as to whether the dry film thickness was coated with a thickness of 30 占 퐉 to obtain a smooth film thickness.

Adhesiveness

According to the cross-cut test method of ASTM D 3359, the scrap formed on the test piece was scratched with a sheath, and the scratched portion was adhered with a cellophane tape so that the portion was evenly adhered. The cellophane tape was then peeled off, and the peeling state of the coating film at the spot where the scratches were formed was visually compared and evaluated in the following manner.

○: No peeling.

?: 80% or more remaining coating film.

X: Less than 50% Coating remains.

Impact resistance ( DuPont formula , 1/2 "* 500 g * 30 cm)

Cracks were measured on a specimen made of 1/2 "× 500g × 30 cm with a DuPont impact tester. The cracks were evaluated in three stages of excellent (◯), good (△), and poor Respectively.

Salt water Split

The specimen prepared in accordance with ASTM B117 was scribed in X-shape according to ASTM D1654 Method 2 (scraping method). Next, according to KS D 9502, a 5% NaCl aqueous solution was injected into a salt spray machine sprayed at 35 ° C to expose the coating film in each time period.

O: 1 mm or less on one side.

?: 1 to 2 mm.

X: 2 mm or more.

Weatherability

Weatherability Using ATLAS UV 2000, an accelerated weathering tester, irradiated at a light intensity of 0.77 W / m ² / nm using a UVA 340 lamp according to ASTM G154-99.

The exposure period is 8 hours 60 (± 3) ° C Black Panel Temperature,

4 hours Condensation 50 (± 3) ℃ Black Panel Temperature

The coating film condition was investigated by exposure to 120 hours.

◯: ΔE = 1.0 or less, gloss drop = 10% or less

?:? E = 2.0 or less, gloss drop = 10 to 20% or less

×: ΔE = 3.0 or less, gloss drop = 30% or more

Zhejiang Province

Each coating composition was stored at 40 占 폚 for 1 month, and then the state of precipitation of the coating composition was confirmed to determine whether hard precipitates were generated.

○: There is no precipitate, viscosity increases within 10ku.

△: Some precipitates are present and the viscosity increases. Within

X: Large amount of precipitates are generated and viscosity can not be measured

mountain Discoloration

According to KSM-5000-3411, the test piece was dripped into a 5% HCl aqueous solution according to the immersion resistance test method of the dry film, and the degree of discoloration thereof was classified by time. Fig. 1 shows a photograph of the result.

○: discoloration within 30 seconds

B: 30 seconds to 60 seconds

X: No discoloration

The results of physical properties of the specimens of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 2 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Non-volatile matter (%) 55 55 55 55 59 60 Viscosity (Ku 25 ° C, Stromer Viscometer) 75 72 68 67 72 74 Particle Size (㎛) 30 30 30 30 30 30 Dry (touch) ○ ○ ○ × △ △ Painting workability △ △ ○ △ ○ ○ Adhesion (Above Epoxy Coating) ○ ○ ○ ○ ○ ○ Salt water silent ○ ○ ○ △ × × Weatherability ○ ○ ○ ○ △ △ Impact resistance (DuPont type, 1/2 "* 500g * 30) △ △ ○ ○ ○ ○ Shelf life (40 ℃, 30 days) △ ○ ○ △ × × Acid discoloration property ○ ○ ○ ○ △ △ Modified Ester: Acrylic 4: 1 4: 1 4: 1 - 4: 1 -

As shown in Table 2, the coating composition of Example 3 according to the present invention is excellent in color discoloration and excellent in dryness, workability, weather resistance, impact resistance, corrosion resistance, adhesion and the like. In the case of Examples 1 and 2, when the content of the colorant is high, there is a high oil absorption amount, and the lack of workability and the drop of the impact property due to the decrease of the flowability are shown.

On the other hand, in the case of Comparative Example 1 using only epoxy ester resin, it was found that the workability was not suitable due to insufficient drying. In Comparative Examples 2 and 3, when the polyester resin was used, There is a serious problem in terms of paint storage property and corrosion resistance. Further, in the case of Comparative Example 2 in which the acrylic resin used for improving the drying property was not added to the epoxy ester resin of the present invention, drying was delayed and corrosion resistance was poor.

When the coating film is physically or chemically exposed to an acid, the color appearance of the coating film may be changed by erosion of an oxidation-drying type epoxy ester-modified resin and discoloring pigment for acid detection. Knowing that conventional methods are difficult to apply directly to industrial sites as film-based or panel-type acid detection materials, the relevant industry safety managers should be aware of the changes, changes and convenience and safety Will recognize. The coating composition for acid detection can be more effectively applied to container transportation means, piping and the like using various acid (acid) by using color change and is applied for safety to prepare for the leakage of various acids by the end user can do.

In the present invention, matters other than those described above can be added or subtracted as required, and therefore, the present invention is not particularly limited thereto.

Claims (10)

Based on the total weight of the coating composition,
25 to 70% by weight of an epoxy ester-modified resin;
1-25% by weight of acrylic resin; And
5 to 50% by weight of a color change pigment for acid detection,
Wherein the epoxy ester-modified resin has a number average molecular weight of 500 to 20,000 and is represented by the following formula (1).
[Chemical Formula 1]

n is 1-7.
delete The method according to claim 1,
Wherein the color change pigment for acid detection comprises a polymer colorant.
The method of claim 3,
The polymeric colorant may be selected from the group consisting of phthalocyanine blue, ferrocyan blue, cobalt blue, ultramine blue, copocarbonate blue, bromocresol green, bromophenol blue, bromochlorophenol blue, tetrabromophenol blue, leuco malachite green, Methyl orange, ethyl orange, rubrin red, methyl orange, ethyl orange, bruvulin red, methyl orange, naphthol yellow S, alizarin yellow GG, thiazole yellow G, alizarin yellow R, morganth orange I, tropahedrine O, Cadmium violet, ultramarine violet, ultramarine violet, cadmium ritol red, rake red, camine red, cadmium red, naphthol red, quinacridone red, chromophthalal, ultramarine red, Congo red, methyl red and allure red AR, cobalt violet, , Ferorite violet, quinacridone violet, dioxazine violet, gentian violet (methyl Violet), anatase type titanium dioxide, rutile type titanium dioxide, and derivatives thereof.
The method according to claim 1,
1 to 5 wt% of a polymer dispersant based on the total weight of the coating composition, 0.1 to 2 wt% of a catalyst, 0.1 to 2 wt% of a defoamer, 0.1 to 2 wt% of a spreading material preparation, 1 to 5 wt% % ≪ / RTI > A paint composition for acid detection.
a) mixing 25-70 wt% of an epoxy ester-modified resin, 1-25 wt% of an acrylic resin, and 5-50 wt% of a color change pigment for acid detection, based on the total weight of the coating composition; And
b) adding a solvent to the mixture prepared from step a) and mixing,
Wherein the epoxy ester-modified resin has a number average molecular weight of 500 to 20,000 and is represented by the following formula (1).
[Chemical Formula 1]

n is 1-7.
The method according to claim 6,
Further comprising the step of pulverizing the mixture prepared from the step (a).
The method according to claim 6,
Wherein the polymer dispersant is added in an amount of 1 to 5% by weight and the storage stabilizer is added in an amount of 0.5 to 10% by weight based on the total weight of the coating composition in step a).
The method according to claim 6,
And 0.1 to 2% by weight of a catalyst based on the total weight of the coating composition is further added and mixed in the step b).
A coating film formed from the coating composition according to any one of claims 1 to 5.

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