KR20200012783A - Paint for detection of hydrogen ion concentration and fabricating method of the same - Google Patents

Abstract

The present invention relates to a paint for detecting hydrogen ion concentration and a production method thereof and, more specifically, to a paint for detecting hydrogen ion concentration, which is not limited to strong acids and strong bases, and has discoloration performance over the entire range of a pH, and is in a wide range of use by allowing different color changes depending on acidity, neutrality, and basicity, and to a production method of a paint for detecting hydrogen ion concentration, which can produce a reactive paint with hydrogen ion concentration change by being included in the production of the paint, and has hydrogen ion concentration change reactivity by adding the same to a previously produced paint.

Description

Paint for hydrogen ion concentration detection and its manufacturing method {PAINT FOR DETECTION OF HYDROGEN ION CONCENTRATION AND FABRICATING METHOD OF THE SAME}

The present invention relates to a coating for detecting hydrogen ion concentration and a method for manufacturing the same, and more particularly, to change the hydrogen ion concentration (pH) due to leakage of an acidic or basic solution from the target surface by coating the target surface where the solution may leak. The present invention relates to a hydrogen ion concentration detecting paint and a method for producing the same, which can prevent the accident caused by the leakage of acidic or basic solution by causing the color change of the paint.

In buildings with acid or alkaline solutions, storage tanks for solution storage and pipes for movement are installed. Such acidic or alkaline solutions have been reported to leak from facilities due to problems such as airtightness problems such as storage tanks, pipes, joints, flanges, valves, and operator mistakes.

As a result, we are trying to detect chemical leaks by installing precision measurement equipment, but it is difficult to install in narrow places such as joints and valves connected to pipes due to the high cost and space required for installation. There is this.

In order to overcome this disadvantage, a technique for checking whether a solution is leaked by coating a detection paint on a surface of an acid or alkaline solution stored or transported has been proposed.

However, the existing detection paints are designed to react only to strong acids below pH 2 or to strong bases above pH 12, so they have to use different products depending on the type of solution moving in the pipe.

Korea Patent Registration No. 10-1199868, 'PH Reactive Coating Agent and Spray Can Paint Using the Same' Korean Laid-Open Patent No. 10-2011-0068759, 'Ink composition, preparation method thereof and absorbent sheet comprising the same' Japanese Laid-Open Patent No. 2007-284630, 'Ink and Detector'

The present invention provides a coating material for detecting hydrogen ion concentration having a discoloration performance over a full range of pH and a method for producing the same.

Hydrogen ion concentration detection paint according to an embodiment of the present invention, the indicator that changes color according to the hydrogen ion concentration change; And a solvent for dissolving the indicator; wherein the additive is mixed with paint to form a hydrogen ion concentration detection paint; and the indicator comprises 10 to 30 wt% of chlorophenol red or cresol red. It includes.

In the paint for detecting hydrogen ion concentration according to an embodiment of the present invention, the indicator is phenolphthalein; Methyl red; Methyl yellow; Thymol blue; And bromothymol blue; may be further included.

In the paint for detecting hydrogen ion concentration according to an embodiment of the present invention, the mixing ratio of the chlorophenol red, the phenolphthalein, the methyl red, the methyl yellow, the thymol blue, and the bromothymol blue is 3: 1: 2: 3: 5: 4 weight ratio.

In the paint for detecting the hydrogen ion concentration according to an embodiment of the present invention, the mixing ratio of the chlorophenol red, the phenolphthalein, the methyl red, the thymol blue, and the bromothymol blue is 3: 1: 2: 5: 4 weight ratio Can be.

In the paint for detecting hydrogen ion concentration according to an embodiment of the present invention, the mixing ratio of the cresol red, the phenolphthalein, the methyl red, the methyl yellow, the thymol blue, and the bromothymol blue is 3: 1: 2: 3 : 5: 4 may be the weight ratio.

In the paint for detecting hydrogen ion concentration according to an embodiment of the present invention, the solvent may be a polar solvent.

In the hydrogen ion concentration detection paint according to an embodiment of the present invention, the polar solvent is at least selected from the group consisting of water, ethanol, methanol, ethylene glycol, formamide, trifluoroacetic acid and dimethyl sulfoxide (DMSO) It can be one.

According to another embodiment of the present invention, a method for preparing a hydrogen ion concentration detecting paint includes: preparing an indicator in which a color is changed according to a change in hydrogen ion concentration; Dissolving the indicator in a solvent to prepare an additive; And mixing the additive with the paint to prepare a hydrogen ion concentration detecting paint, wherein the indicator includes 10 to 30 wt% of chlorophenol red or cresol red.

In the method for preparing a hydrogen ion concentration detecting paint according to another embodiment of the present invention, the indicator may further include at least one of phenolphthalein, methyl red, methyl yellow, thymol blue, and bromothymol blue.

In the method for preparing a hydrogen ion concentration detecting paint according to another embodiment of the present invention, the solvent may be a polar solvent.

In the method for preparing a hydrogen ion concentration detecting paint according to another embodiment of the present invention, the polar solvent is selected from the group consisting of water, ethanol, methanol, ethylene glycol, formamide, trifluoroacetic acid and dimethyl sulfoxide (DMSO). Can be selected.

In the manufacturing method of the hydrogen ion concentration detection paint according to another embodiment of the present invention, the additive may be added 20% or more relative to the volume of the paint.

According to an embodiment of the present invention, it is possible to provide a hydrogen ion concentration detecting paint having a discoloration performance in a full range of pH, not limited to strong acids and strong bases.

According to an embodiment of the present invention, it is possible to provide a color for hydrogen ion concentration detection paint having a wide range of use by enabling different color changes according to acidity, neutrality, basicity and color change even at small pH changes. have.

According to another embodiment of the present invention is included in the production of the paint to produce a hydrogen ion concentration change reactive paint, or is added to the previously prepared paint to produce a hydrogen ion concentration detection paint having a hydrogen ion concentration change reactivity It may provide a method.

1A to 1C are images showing the discoloration result of the hydrogen ion concentration detection paint according to Example 1-1 of the present invention.
1d to 1f are images showing the discoloration result of the hydrogen ion concentration detection paint according to Example 1-2 of the present invention.
2A to 2C are images showing the discoloration result of the hydrogen ion concentration detection paint according to Example 2-1 of the present invention.
Figure 2d is an image showing the color change results of the hydrogen ion concentration detection paint according to Example 2-2 of the present invention.
Figure 3 is an image showing the color change results of the hydrogen ion concentration detection paint according to Example 3 of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

As used herein, “an embodiment”, “an example”, “side”, “an example”, etc., should be construed that any aspect or design described is better or advantageous than other aspects or designs. It is not.

In addition, the term 'or' refers to an inclusive or 'inclusive or' rather than an exclusive or 'exclusive or'. In other words, unless stated otherwise or unclear from the context, the expression 'x uses a or b' means any one of natural inclusive permutations.

Also, the singular forms “a” or “an”, as used in this specification and in the claims, generally refer to “one or more” unless the context clearly dictates otherwise or in reference to a singular form. Should be interpreted as.

The terminology used in the following description has been chosen to be general and universal in the art to which it relates, although other terms may vary depending on the development and / or change in technology, conventions, and preferences of those skilled in the art. Therefore, the terms used in the following description should not be understood as limiting the technical spirit, and should be understood as exemplary terms for describing the embodiments.

In addition, in certain cases, there is a term arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in detail in the corresponding description. Therefore, the terms used in the following description should be understood based on the meanings of the terms and the contents throughout the specification, rather than simply the names of the terms.

Unless otherwise defined, all terms used in the present specification (including technical and scientific terms) may be used in a sense that can be commonly understood by those skilled in the art. In addition, terms that are defined in a commonly used dictionary are not ideally or excessively interpreted unless they are specifically defined clearly.

On the other hand, in describing the present invention, when it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express an embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a paint for detecting the hydrogen ion concentration, the color change is expressed when the acidic, neutral or basic solution leaks, it is characterized in that it is easy to check whether the solution leaks on the surface to be used paint.

The surface to be used for paint includes all objects that can leak the solution, such as pipes, leaking adjacent surfaces, solution reservoirs, pipe joint flanges, and the like.

In the case of the conventional leak detection paint is limited in the range of use for acid or basic, there was an inconvenience to use different paints depending on the characteristics of the solution flowing inside the target surface.

In addition, there is a problem that the change in the range of hydrogen ion concentration that can be detected is small, so that discoloration does not occur depending on the range of use even when leakage occurs.

The present invention has a characteristic that the color change in the entire pH range in one paint can be used for all target surfaces irrespective of the characteristics of the solution, and different colors can be expressed for each change range of the hydrogen ion concentration. As a result, the range of use and the range of use are extended.

Hydrogen ion concentration detection paint according to an embodiment of the present invention includes an indicator consisting of an indicator that changes color according to the hydrogen ion concentration change and a solvent for dissolving the indicator, the additive is mixed with paint to hydrogen ions To form a coating for detecting the concentration, the indicator is characterized in that it comprises 10 to 30% by weight of chlorophenol red or cresol red.

In addition, the indicator may further include phenolphthalein, methyl red, methyl yellow, thymol blue and bromothymol blue in addition to chlorophenol red and cresol red.

As the solvent for dissolving the indicator, a polar solvent may be used, and more specifically, at least one selected from the group consisting of water, ethanol, methanol, ethylene glycol, formamide, trifluoroacetic acid, and dimethyl sulfoxide (DMSO). Solvents may be used.

According to another embodiment of the present invention, a method for preparing a hydrogen ion concentration detecting paint may include preparing an indicator that changes color according to a change in hydrogen ion concentration, dissolving the indicator in a solvent to prepare an additive, and adding the additive. Mixing to paint to produce a hydrogen ion concentration detecting paint, the indicator comprising 10 to 30% by weight of chlorophenol red and cresol red.

When mixing the additive with the paint, the additive may be added in a volume of 20% or more relative to the volume of the paint. When the additive is added to a volume of less than 10% of the volume of the paint, the degree of color change according to the hydrogen ion concentration is small, causing problems in visibility.

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

Example 1-1

An indicator is prepared by mixing 1 g phenolphthalein, 2 g methyl red, 3 g methyl yellow, 5 g thymol blue, 4 g bromothymol blue and 3 g chlorophenol red in 500 ml acetone.

The prepared indicator was mixed with 2.5 L of an aqueous paint, a urethane paint, and an enamel paint, respectively, to prepare respective hydrogen ion concentration detecting paints. The prepared paint was applied to a polyethylene (PE) plate once and a pH 2 solution (acidic) adjusted with sulfuric acid, a pH 6.8 (neutral) adjusted with distilled water, and a pH 12 solution (basic) adjusted with sodium hydroxide were used to detect color change. Dropped to observe the color change.

Example 1-2

An indicator is prepared by mixing 500 g acetone with 0.1 g phenolphthalein, 0.2 g methyl red, 0.3 g methyl yellow, 0.5 g thymol blue, 0.4 g bromothymol blue and 0.3 g chlorophenol red.

The prepared indicator was mixed with 2.5 L of urethane paint and enamel paint, respectively, to prepare respective hydrogen ion concentration detection paints. The prepared paint was applied to a polyethylene (PE) plate once and a pH 2 solution (acidic) adjusted with sulfuric acid, a pH 6.8 (neutral) adjusted with distilled water, and a pH 12 solution (basic) adjusted with sodium hydroxide were used to detect color change. Dropped to observe the color change.

Example 2-1

An indicator is prepared by mixing 1 g phenolphthalein, 2 g methyl red, 5 g thymol blue, 4 g bromothymol blue and 3 g chlorophenol red in 500 ml acetone.

The prepared indicator was mixed with 2.5L of water paint, urethane paint, and enamel paint, respectively, to prepare respective hydrogen ion concentration detection paints. The prepared paint was applied to a polyethylene (PE) plate once and a pH 2 solution (acidic) adjusted with sulfuric acid, a pH 6.8 (neutral) adjusted with distilled water, and a pH 12 solution (basic) adjusted with sodium hydroxide were used to detect color change. Dropped to observe the color change.

Example 2-2

An indicator is prepared by mixing 500 ml of acetone with 0.1 g of phenolphthalein, 0.2 g of methyl red, 0.5 g of thymol blue, 0.4 g of bromothymol blue and 0.3 g of chlorophenol red.

The prepared indicator was mixed with 2.5L of an aqueous paint to prepare a paint for detecting hydrogen ion concentration. The prepared paint was applied to a polyethylene (PE) plate once and a pH 2 solution (acidic) adjusted with sulfuric acid, a pH 6.8 (neutral) adjusted with distilled water, and a pH 12 solution (basic) adjusted with sodium hydroxide were used to detect color change. Dropped to observe the color change.

Example 3

An indicator is prepared by mixing 1 g phenolphthalein, 2 g methyl red, 3 g methyl yellow, 5 g thymol blue, 4 g bromothymol blue and 3 g cresol red in 500 ml acetone.

The prepared indicator was mixed with 2.5 L of aqueous paint to prepare a hydrogen ion concentration detecting paint. The prepared paint was applied to the polyethylene (PE) plate once and adjusted to pH 2 (strong acid) and pH 5 solution (weak acid) adjusted with sulfuric acid, pH 6.8 (neutral) and distilled water to detect color change. 10 (weak base) and pH 12 solution (strong base) were dropped to observe the color change.

The composition ratio of the Example of this invention was briefly created in the following table.

Composition Phenolphthalein Methyl red Methyl yellow Thymol blue Bromoty Mall Blue Chlorophenol red Cresoled Example
1-1 One 2 3 5 4 3 - Example
1-2 0.1 0.2 0.3 0.5 0.4 0.3 - Example
2-1 One 2 - 5 4 3 - Example
2-2 0.1 0.2 - 0.5 0.4 0.3 - Example
3 One 2 3 5 4 - 3

Hereinafter, the characteristics of the hydrogen ion concentration detection paint according to embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1a is an image showing the color change results of the hydrogen ion concentration detection paint mixed with the aqueous paint according to Example 1-1 of the present invention.

Referring to Figure 1a, the coating material prepared by adding the additive prepared in the paint composition ratio of 20% by volume on the polyethylene (PE) plate and then observed the color change using three kinds of solutions of strong acid, neutral, strong base Example. Color changes occurred in red at pH 2 strong acids, beige at neutral pH 6.8, and ultramarine blue at pH 12 strong bases.

1B is an image showing the discoloration result of the hydrogen ion concentration detection paint mixed with the urethane paint according to Example 1-1 of the present invention.

Referring to FIG. 1B, the coating material prepared by adding the additive prepared in the paint composition ratio at a volume ratio of 20% was coated on a polyethylene (PE) plate, and then color change was observed using three kinds of solutions of strong acid, neutral, and strong base. Example. The color changes to pink at pH 2 strong acid, light orange at pH 6.8 neutral, and light green at pH 12 strong base.

Figure 1c is an image showing the discoloration results of the hydrogen ion concentration detection paint mixed with the enamel paint according to Example 1-1 of the present invention.

Referring to Figure 1c, after the coating material prepared by adding the additive prepared by the paint composition ratio in 20% by volume on the polyethylene (PE) plate and observed the color change using three kinds of solutions of strong acid, neutral, strong base Example. The color changes to red at pH 2 strong acid, orange at pH 6.8 neutral, and ultra blue at pH 12 strong base.

1D is an image showing a result of discoloration of a hydrogen ion concentration detection paint mixed with an aqueous paint according to Example 1-2 of the present invention.

Figure 1e is an image showing the discoloration results of the hydrogen ion concentration detection paint mixed with the urethane paint according to Example 1-2 of the present invention.

Figure 1f is an image showing the discoloration results of the hydrogen ion concentration detection paint mixed with the enamel paint according to Example 1-2 of the present invention.

Referring to FIGS. 1D, 1E, and 1F, a paint prepared by adding the additive prepared at the paint composition ratio in a volume ratio of 20% is coated on a polyethylene (PE) plate, and then using three kinds of solutions of strong acid, neutral, and strong base. 1D, 1E, and 1F show the color change immediately after reacting with three kinds of solutions of strong acid, midwest, and strong base, and the right column shows strong acid, midwest, It shows the color change after 20 seconds after the reaction with three kinds of strong base solution. Referring to FIGS. 1D and 1E, the color change slightly occurred in red at pH 2 strong acid, beige at neutral pH 6.8, and ultramarine blue at pH 12 strong base.

Figure 2a is an image showing the result of discoloration of the hydrogen ion concentration detection paint mixed with the water-based paint according to Example 2-1 of the present invention.

Figure 2b is an image showing the result of discoloration of the hydrogen ion concentration detection paint mixed with the urethane paint according to Example 2-1 of the present invention.

Figure 2c is an image showing the discoloration results of the hydrogen ion concentration detection paint mixed with the enamel paint according to Example 2-1 of the present invention.

Referring to Figures 2a to 2c, the coating material prepared by adding the additive prepared in the paint composition ratio of 20% by volume on the polyethylene (PE) plate and then change the color using three kinds of solutions of strong acid, neutral, strong base It is an embodiment that observed. The color changes to red at pH 2 strong acid, orange at pH 6.8 neutral, and ultra blue at pH 12 strong base.

Figure 2d is an image showing the result of discoloration of the hydrogen ion concentration detection paint mixed with the aqueous paint according to Example 2-2 of the present invention.

Referring to FIG. 2D, the coating material prepared by adding the additive prepared in the paint composition ratio at a volume ratio of 20% was applied to a polyethylene (PE) plate, and then observed color change using three kinds of solutions of strong acid, neutral, and strong base. Example. The color changes to red at pH 2 strong acid, orange at pH 6.8 neutral, and ultra blue at pH 12 strong base.

Figure 3 is an image showing the discoloration results of the hydrogen ion concentration detection paint mixed with the urethane paint according to the third embodiment of the present invention.

Referring to FIG. 3, the paint prepared by adding the additive prepared in the paint composition ratio at a volume ratio of 20% is coated on a polyethylene (PE) plate, and then using five kinds of solutions of strong acid, weak acid, neutral, weak base, and strong base. It is the Example which observed the change. The color changes to pink at pH 2 strong acid, yellow at pH 5, blue at neutral pH 6.8, blue at pH 10 weak base, and ultra blue at pH 12 strong base.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical spirit of the present invention can be carried out in addition to the embodiments disclosed herein.

Claims (12)

An indicator that changes color according to a change in hydrogen ion concentration; And
A solvent for dissolving the indicator;
It comprises; Additives consisting of,
The additive is mixed with paint to form a hydrogen ion concentration detection paint;
The indicator is hydrogen ion concentration detection paint, characterized in that it comprises 10 to 30% by weight of chlorophenol red or cresol red.
The method of claim 1,
The indicator is
Phenolphthalein;
Methyl red;
Methyl yellow;
Thymol blue; And
Bromothymol blue; Paint for detecting hydrogen ion concentration further comprising.
The method according to claim 1 or 2,
The mixture ratio of the chlorophenol red, the phenolphthalein, the methyl red, the methyl yellow, the thymol blue, and the bromothymol blue is 3: 1: 2: 3: for hydrogen ion concentration detection, characterized in that the weight ratio varnish.
The method according to claim 1 or 2,
A mixing ratio of the chlorophenol red, the phenolphthalein, the methyl red, the thymol blue, and the bromothymol blue is 3: 1: 2: 5: 4 weight ratio of the coating material for detecting hydrogen ion concentration.
The method according to claim 1 or 2,
The mixing ratio of the cresol red, the phenolphthalein, the methyl red, the thymol blue, the methyl yellow, and the bromothymol blue is 3: 1: 2: 3: 5: 4 weight ratio coating material for detecting hydrogen ion concentration .
The method of claim 1,
The solvent is a hydrogen ion concentration detection paint, characterized in that the polar solvent.
The method of claim 3,
The polar solvent is at least one selected from the group consisting of water, ethanol, methanol, ethylene glycol, formamide, trifluoroacetic acid and dimethyl sulfoxide (DMSO) coating material for detecting hydrogen ion concentration.
Preparing an indicator that changes color according to a change in hydrogen ion concentration;
Dissolving the indicator in a solvent to prepare an additive; And
Preparing a paint for detecting hydrogen ion concentration by mixing the additive with paint;
Including,
The indicator is a hydrogen ion concentration detection paint production method comprising 10 to 30% by weight of chlorophenol red or cresol red.
The method of claim 8,
The indicator is a hydrogen ion concentration detecting paint production method further comprises at least one of phenolphthalein, methyl red, methyl yellow, thymol blue and bromothymol blue.
The method of claim 8,
The solvent is a coating method for producing a hydrogen ion concentration detection, characterized in that the polar solvent.
The method of claim 10,
Wherein said polar solvent is selected from the group consisting of water, ethanol, methanol, ethylene glycol, formamide, trifluoroacetic acid and dimethyl sulfoxide (DMSO).
The method of claim 8,
The additive is a hydrogen ion concentration detection paint production method, characterized in that added to 20% or more relative to the volume of the paint.

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