KR101795892B1 - Paint Composition for Detecting Alkali Having Discoloration Performance to Alkali Leakage and Method for Preparing Thereof - Google Patents
Paint Composition for Detecting Alkali Having Discoloration Performance to Alkali Leakage and Method for Preparing Thereof Download PDFInfo
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- KR101795892B1 KR101795892B1 KR1020150186187A KR20150186187A KR101795892B1 KR 101795892 B1 KR101795892 B1 KR 101795892B1 KR 1020150186187 A KR1020150186187 A KR 1020150186187A KR 20150186187 A KR20150186187 A KR 20150186187A KR 101795892 B1 KR101795892 B1 KR 101795892B1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
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Abstract
The present invention relates to a paint having an ability to discolor due to alkali leakage when applied to the inside and outside of a plant (facility) using an alkaline substance, The present invention relates to a paint composition for detection, which comprises an alkali-soluble alkyd resin, an alkali-soluble alkyd resin, and an alkali-soluble alkaline resin, wherein the alkali-soluble alkyd resin is contained in an amount of 20 to 60% by weight, acrylic resin in an amount of 5 to 20% by weight, alkyd resin in an amount of 5 to 20% A detection coating composition and a method for producing the same are provided.
Description
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 an organic dry coating film is formed, The present invention relates to a coating composition for alkali detection and a method for producing the same.
Typical conditions that can be monitored using color changes include physical conditions, such as the presence of moisture and chemical conditions, such as pH changes. Typical consumer products that can be more effective by containing suitable discolouration materials and which can provide more benefits to the end user are container vehicles, piping, etc., which use various alkalis. In addition, products that can be applied by the end user for safety against leakage of various alkalis 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 conventional technique having a coloring ability to an alkali 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 of liquid, a composition that is wettable but water insoluble is required. 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.
The present invention is used to improve the protection of the material and the beauty of the material as well as the general paint, and it maintains the quick drying property and the adhesion property. It has the durability and the good retention property and thus occurs when using the conventional alkali detection material (adhesive type, pH paper) Eliminating the need for protection from moisture that has been done; 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 an object of the present invention is to provide a paint composition for alkali detection which has little discoloration due to sunlight during outdoor application due to its excellent durability.
Accordingly, the coating composition for alkaline detection of the present invention is effective not only in the new chemical equipment and the existing facilities as a protective coating, but also as a safety manager and a worker in case of leakage of an alkaline substance, It can be applied to the places where chemical plants requiring effects are operated.
An embodiment of the present invention relates to a coating composition comprising 20 to 60% by weight of an acrylic modified alkyd resin, 5 to 20% by weight of an acrylic resin, 5 to 20% by weight of an alkyd resin, and 5 to 50% The present invention also provides a coating composition for alkali detection,
The acrylic-modified alkyd resin may have a whey content of 30% to 45% and an acid value of 5 or less.
The acrylic-modified alkyd resin may be obtained from a fatty acid having an acryl content of 20 to 50% and a carbon number of 8 to 20.
The fatty acid may be at least one selected from the group consisting of coconut fatty acid, dihydrate castor oil fatty acid, isononanoic fatty acid, soybean oil fatty acid, and tolut oil fatty acid.
The acrylic-modified alkyd resin may be an acrylic-modified alkyd resin having a number-average molecular weight of 1,000 to 10,000 and a polydispersity index of 5 to 15.
[Chemical Formula 1]
R is an alkyl group having 8-18 carbon atoms, and n is 20-100.
In addition, the color change pigment for alkali detection may include a polymer colorant.
The polymer colorant may also be selected from the group consisting of phthalocyanine blue, ferrocyan blue, cobalt blue, ultramarine blue, copper carbonate blue, bromocresol green, bromophenol blue, bromochlorophenol blue, tetrabromophenol blue, leuco malachite green, Methyl orange, ethyl orange, cadmium red, green orange, brilliant green, methyl yellow, naphthol yellow S, alizarin yellow GG, thiazole yellow G, alizarin yellow R, morganth orange I, tropaeolin O, , Naphthol Red, Quinacridone Red, Chromophthal Red, Ultramarine Red, Congo Red, Methyl Red and Allure Red AR, Cobalt Violet, Maganis Violet, Ultramarine Violet, Perolite Violet, Quinacridone Violet, Violet, gentian violet (methyl violet), anatase type titanium dioxide, rutile type One selected from the group consisting of titanium screen may be at least.
Further, the coating composition for alkali detection is preferably used in an amount of 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% By weight, and 0.5-10% by weight of a storage stabilizer.
Another embodiment of the present invention is a process for preparing a coloring pigment composition comprising mixing a) 20 to 60% by weight of an acrylic modified alkyd resin, 5 to 20% by weight of an acrylic resin, 5 to 20% by weight of an alkyd resin, and 5 to 50% step; And b) adding a solvent to the mixture prepared from the step a) and mixing the mixture.
The method may further comprise grinding the mixture prepared from step a).
The acrylic-modified alkyd resin may be an acrylic-modified alkyd resin having a number-average molecular weight of 1,000 to 10,000 and a polydispersity index of 5 to 15.
[Chemical Formula 1]
R is an alkyl group having 8-18 carbon atoms, and n is 20-100.
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 alkali detection having the discoloring performance according to the present invention can be used for the purpose of preventing the erosion of the acrylic-modified alkyd resin and the discoloration pigment for alkali detection when the coating film is physically or chemically exposed to the alkali The color appearance changes.
In addition, the conventional method is difficult to apply directly to an industrial site with an alkali detecting material in the form of a film or a panel, and maintenance cost has been continuously incurred. However, the coating composition for alkali detection according to the present invention Excellent workability can be imparted, and adhesion and durability can be maintained. Furthermore, since the effect of the plaster as an existing paint is given to the function of detecting the safety against the leakage of the alkaline material, it is possible to prevent a large accident caused by the leakage of the alkaline material, .
The present invention relates to a coating composition for alkali detection comprising a color-changing pigment for alkali 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 alkali detection of the present invention comprises a color change pigment for alkali detection which is discolored when exposed to various kinds of alkalies, physically or chemically, and a water-insoluble film-forming polymer. When the coating film formed by the coating composition of the present invention is physically or chemically exposed to alkali, the color appearance of the coating film may be changed by the erosion of the acrylic-modified alkyd resin and the coating composition for alkali detection.
Further, the coating composition for alkali detection 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 an alkaline-detecting discoloring pigment, and forms a coating film for keeping the discoloring pigment for alkaline detection, the dispersing agent and the storage 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 of such solvents. The water-insoluble film-forming polymer is solid after drying but can be dissolved in volatile organic solvents or organic mixed solvents, and the coating composition for alkali detection is liquid at room temperature.
Further, the water-insoluble film-forming polymer suitable for use in the present invention may be selected from copolymers of acrylates, amides, polyurethanes, epoxies, polyesters, alkyd compounds and fatty acids.
In addition, suitable film-forming varnish materials may be polymeric materials or a mixture of oligomers and polymers.
The primary function of the coating composition for alkali detection comprising the film-forming component of the present invention is to prevent the composition from falling off the substrate when the composition is dried, effectively adhering to the substrate. The secondary function is to increase the wettability of the coating composition for alkaline detection by rapid erosion when the coating film is exposed to fluid in an alkaline state in a gaseous state so that it changes color and responds to various alkalies with respect to a specific physical or chemical condition.
More specifically, the coating film forming component may include an alkyd resin bonded with a modified acryl, which is a component capable of modifying (melting) the surface by alkali.
In addition, the coating composition of the present invention comprises an acrylic resin and an alkyd resin together with the acrylic-modified alkyd resin. Accordingly, in one embodiment, the coating composition of the present invention comprises 20 to 60% by weight of an acrylic modified alkyd resin, 5 to 20% by weight of an acrylic resin, 5 to 20% by weight of an alkyd resin, And preferably 5 to 50% by weight.
For example, the coating composition for alkali detection of the present invention may contain 20 to 40% by weight of an acrylic-modified alkyd resin based on the total weight of the composition, may include 5 to 15% by weight of an acrylic resin, 15% by weight of an alkyd resin.
The acrylic-modified alkyd resin as a base has a whey content of 30% to 45%, preferably 32% to 40%, and an acid value of 5 or less, preferably 3 or less. The whey represents the content (wt%) of oil or fatty acid.
The acrylic-modified alkyd resin that can be used in the present invention is an acrylic resin copolymerized with an alkyd resin using a fatty acid, and the acrylic content may be 20 to 50%. The acrylic resin may have a glass transition temperature of 10 to 80 캜, preferably 30 to 60 캜, and a solid content of 80% or less, preferably 60% or less. Depending on the type of acrylic resin, there are many differences in adhesion and alkali 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.
The acrylic-modified alkyd resin may be contained in an amount of 20 to 60% by weight, preferably 20 to 50% by weight based on the total weight of the entire coating composition. If the content of the acrylic-modified alkyd resin is less than 20% by weight, the paint composition may be detached. If the content of the acrylic-modified alkyd resin is more than 60% by weight, the time of erosion by alkali may be delayed.
The acrylic-modified alkyd resin may be an acrylic-modified alkyd resin represented by the general formula (1) and having a number average molecular weight of 1,000 to 10,000 and a polydispersity index of 5 to 15.
[Chemical Formula 1]
R is a substituted or unsubstituted, saturated or unsaturated alkyl group having 8-18 carbon atoms, and n is 20-100. The above-mentioned n may preferably be 40 to 60. [
The acrylic-modified alkyd resin imparts flexibility to the coating composition for alkali detection of the present invention. Preferably, the number average molecular weight may be 1,000 to 5,000. If the number average molecular weight is less than 1,000, a problem of brittle of the final coating composition may occur. If the number average molecular weight exceeds 10,000, dryability is deteriorated due to rapid drying.
Meanwhile, the alkyd resin contained in the coating composition of the present invention may have a number average molecular weight of 1,000 to 10,000, preferably 2,000 to 5,000. If the number average molecular weight is less than 1,000, the anti-corrosive properties may be deteriorated. If the number average molecular weight is more than 5,000, it is not preferable from the viewpoint of dryness and weatherability.
The alkyd resin is used for improving the drying property, the adhesion property, and the rust prevention property in the coating composition. These alkyd resins have phthalic acid as a main component in their structure and form a coating film which is water insoluble after oxidation and drying.
The alkyd resin may be contained in an amount of 5 to 20% by weight, preferably 0.5 to 10% by weight or 3 to 15% by weight, more preferably 2 to 5% by weight based on the total weight of the total coating composition. If the content is less than 5% by weight, the coating becomes brittle and adheres to deteriorate. If the content is more than 20% by weight, sufficient drying of the coating film may not occur and physical properties of the coating film may be deteriorated. Such alkyd resins can be selected in different amounts and types depending on the compatibility with the acrylic-modified alkyd resin as the main component, the type of coating equipment, the strength of the coating film, the adhesion property,
In addition, the coating composition for alkali detection of the present invention may contain a nitrocellulose-based resin in addition to the acrylic-modified alkyd resin. If it is included, it is easy to use in the form of can spray. It is believed that such film-forming polymers can improve the adhesion of the coating composition to the substrate.
Further, the coating composition for alkali detection of the present invention contains a coating film-forming component of at least 35% by weight based on the total weight of the coating composition. Preferably, the coating composition for alkali detection of the present invention comprises a coating film forming component in an amount of 35% by weight to 70% by weight of the total weight of the coating composition.
In addition, the coating composition for an alkali detection of the present invention comprises a functioning colorant, preferably a colorant which is discolored by alkali. The colorant may be a neutral colorant, an acidic colorant or a basic colorant. Preferably, the colorant discolors at a pH of 9.0 or higher. 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. Examples of suitable colorants include: phthalocyanine blue, ferrocyan blue, cobalt blue, ultramarine blue, copper carbonate blue, bromocresol green, bromophenol blue, bromochlorophenol blue, tetrabromophenol blue, Methyl orange, naphthol yellow S, alizarin yellow GG, thiazole yellow G, alizarin yellow R, morganth orange I, tropaeolin O, orange G, acidic fuchsin, methyl orange, But are not limited to, ethyl orange, cadmium red, naphthol red, quinacridone red, chromophthalal, ultramarine red, Congo red, methyl red and allure red AR, cobalt violet, maganis violet, ultramarine violet, perorite violet, Money violet, dioxazine violet, gentian violet (methyl violet), anatase type titanium dioxide Titanium, rutile titanium dioxide, and each derivative thereof.
The coating composition of the present invention may contain two or more coloring agents. When two or more colorants are used, the colorant may 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.
In addition, since the color change pigment for alkali detection influences color, 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 alkali detection, which contains the colorant and the extender pigment, . If the content of the color change pigment for alkali detection is less than 5 wt%, a sufficient hiding effect can not be obtained. If the content is more than 50 wt%, dispersion and storage stability of the coating composition deteriorate.
Further, the color change pigment for alkali detection of the present invention includes a pigment selected from the group consisting of a soluble low toxicity pigment, a coloring and extender pigment, and a mixture 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.
Further, the coating composition of the present invention contains a colorant in an amount of 5 to 50% by weight based on the total weight of the coating composition. Preferably, the coating composition of the present invention may contain a colorant in an amount of 10 to 40% by weight of the total weight of the coating composition.
Preferably, the water-insoluble film-forming polymer of the present invention is corroded by alkali, and the coloring agent and the pigment in the coloring pigment for alkali detection are discolored by the alkali, so that the coloring performance of the water-insoluble film-
Further, the coating composition for alkali detection of the present invention may further comprise at least one member selected from the group consisting of a polymer dispersing agent, a storage stabilizer, a catalyst, a defoamer, a spreading agent for a material spreading agent, a sedimentation inhibitor, a drying promoter, have.
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 its kind. The coating composition for alkali detection of the present invention may contain a dispersing agent, preferably an opposite charge to draw a positively or negatively charged coloring agent. It is believed that the dispersing agent plays a dual role in the coating composition for alkali detection. 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 coating composition for alkali detection of the present invention is reaction time. The reaction time can be improved (by increasing the amount of dispersant) by increasing the wettability of the coating composition so that the fluid and gas can penetrate more quickly. However, a potential disadvantage of increasing the amount of dispersant is reduced stability, especially reduced stability at 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 coating composition for alkali detection, 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 coating composition for alkali detection of the present invention comprises 2% by weight to 10% by weight of the dispersing agent based on the total weight of the coating composition. Preferably, the coating compositions for alkali detection of the present invention comprise a dispersant charged with an opposite charge in an amount of 1 to 5% by weight of the total weight of the coating composition.
Also, 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 another embodiment, the coating composition for alkali detection of the present invention may contain an organic solvent to facilitate application to a substrate. In other words, the film-forming component may be dissolved or suspended in the organic solvent to be evaporated later. 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, 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.
Also, 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 bond of the acrylic-modified alkyd resin contained in the coating composition of the present invention to accelerate curing, and is used in an amount of 0.1 to 2 wt% based on the total weight of the entire coating composition 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 for producing a coating composition for alkali detection having a discoloring performance according to the above alkali leakage. The method comprises the steps of: a) providing a coating composition comprising 20 to 60 wt% of an acrylic modified alkyd resin, 5 to 20 wt% of an acrylic resin, 5 to 20 wt% of an alkyd resin, and 5 to 50 wt% Mixing a discoloring pigment; 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).
The acrylic-modified alkyd resin may be an acrylic-modified alkyd resin having a number-average molecular weight of 1,000 to 10,000 and a polydispersity index of 5 to 15.
[Chemical Formula 1]
R is a substituted or unsubstituted, saturated or unsaturated alkyl group having 8-18 carbon atoms, and n is 20-100. The above-mentioned n may preferably be 40 to 60. [
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.
Particularly, in a preferred embodiment of the present invention, the acrylic-modified alkyd resin composition comprises i) an acrylic-modified alkyd resin, an acrylic resin, an alkyd resin, a polymer dispersant, a colorant and an extender pigment are added to the reactor and uniformly mixed to form a colorant and an extender pigment Wetting the surface, ii) dispersing the mixture of step i) at high speed to produce a dispersion, iii) adding the catalyst and auxiliary agent to the mixture of step ii), adding a preservative and a finishing agent Followed by uniform mixing.
As a result, the coating composition for alkali detection had a viscosity of 75 to 125 ku as measured by a creverse-stopper viscometer, a gloss of the coating film of 5 to 50% and a particle size of 20 to 30 μm.
The coating composition for alkali detection prepared by this method is excellent in adhesion and durability because it is coated on a base material and detects alkali leaks quickly in response to a rapid reaction with alkali so that safety can be taken when an alkali is leaked. .
Further, one embodiment of the present invention comprises applying the coating composition to a substrate. Further, the equipment can be assembled or installed after coating the parts at room temperature in advance before the facilities to which the coating composition for alkali 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 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 on the substrate to form a coating film, 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
The coating compositions for alkali detection were prepared as shown in Table 1 below. First, a base material such as an acryl-modified alkyd resin, an alkyd resin, and an acrylic resin, a polymer dispersant, and a storage stabilizer were added to the reactor, and the mixture was stirred 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, and a coloring agent and an extender pigment which were discolored by alkali were added thereto. The mixture was 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 to prepare a coating composition for alkali detection having a viscosity of 60 to 70 ku.
Comparative Example 1-4
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.
Thus, the content of each composition in the coating compositions of Examples 1 to 3 and Comparative Examples 1 to 4 is as shown in Table 1 below. The unit is weight%.
week)
1: Acryl-modified alkyd resin: Number average molecular weight 500 to 20,000,
2: Acrylic resin: Number average molecular weight 500 to 20,000,
3: Alkyd resin: Number average molecular weight 500 to 20,000,
4: Colorant: titanium dioxide, phthalocyanine blue, ultramarine blue, cobalt violet, quinacridone 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% Co
9: 12% Zr
10: 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: stabilizer: xylene, toluene
Experimental Example
In order to measure the coating properties of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4, a stainless steel 304 was spray-coated with a 2-part type epoxy paint for non-ferrous metal to a thickness of 20 to 30 탆 and dried. 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.
Non-volatile matter (%)
After the sample was sampled, the weight of the initial sample was measured, and the sample was weighed and dried at 105 ° C for 3 hours to calculate the weight of volatile matter based on the initial sample weight.
[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)
Specified humidity film thickness 75 탆 Measures tack-free time after application
○: 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 "× 500 g × 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
alkali Discoloration
In accordance with KSM-5000-3411, 5% NaOH aqueous solution was added dropwise to the specimens according to the immersion resistance test method of the dry film, and the degree of discoloration was determined by time.
○: 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 4 are shown in Table 2 below.
As shown in Table 2, the coating composition of Example 3 according to the present invention is excellent in alkali discoloration, and is excellent in dryness, workability, weather resistance, impact resistance, corrosion resistance, adhesiveness and the like. On the other hand, in the case of Examples 1 and 2, when the content of the colorant is high, a high oil absorption amount shows a lack of workability and a decrease in weatherability due to a decrease in flowability.
On the other hand, in Comparative Example 2 using only acrylic modified alkyd resin without using acrylic resin and Comparative Example 4 using only alkyd resin, it was found that drying was not fast and workability was not suitable, and Comparative Example 3, 4, the use of the alkyd resin causes less erosion due to alkali, and the alkali discoloration is lowered, resulting in a lack of workability due to a higher viscosity. In addition, in Examples 1 and 2, in which the content of the acrylic resin used for improving the drying property was increased in the acrylic-modified alkyd resin of the present invention, the drying was accelerated and the workability deteriorated.
The color appearance of a coating film can be changed by the erosion of an acrylic-modified alkyd resin which forms a coating film when the coating film is physically or chemically exposed to alkali and by the discoloring pigment for alkali detection. Knowing that conventional methods are difficult to apply directly to industrial sites as film or plate type alkaline detection materials, the industry safety managers should be aware of the changes, changes and convenience and safety Will recognize. The coating composition for alkali detection can be more effectively applied to container transportation means, piping and the like using various kinds of alkali (Alkali) by using color change and is applied for the safety to prepare for the leakage of various kinds of alkali (Alkali) .
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 (13)
20 to 60% by weight of an acrylic-modified alkyd resin;
5 to 20% by weight of an acrylic resin;
5 to 20% by weight of an alkyd resin; And
And 5 to 50% by weight of a color change pigment for alkali detection,
The acrylic-modified alkyd resin is an acrylic-modified alkyd resin represented by the general formula (1) and having a number-average molecular weight of 1,000 to 10,000 and a polydispersity index of 5 to 15. The coating composition for alkaline-
[Chemical Formula 1]
R is an alkyl group having 8-18 carbon atoms, and n is 20-100.
Wherein the acryl-modified alkyd resin has a whey content of 30% to 45% and an acid value of 5 or less.
Wherein the acrylic-modified alkyd resin is obtained from a fatty acid having an acrylic content of 20 to 50% by weight and a carbon number of 8 to 20.
Wherein the fatty acid is at least one selected from the group consisting of coconut fatty acid, dihydrate castor oil fatty acid, isononanoic fatty acid, soybean oil fatty acid, and tall oil fatty acid.
The color change pigment for alkali detection includes a polymer colorant.
The polymeric colorant may be selected from the group consisting of phthalocyanine blue, ferrocyan blue, cobalt blue, ultramarine blue, copper carbonate blue, bromocresol green, bromophenol blue, bromochlorophenol blue, tetrabromophenol blue, leuco malachite green, Methyl orange, ethyl orange, cadmium red, cadmium red, methyl orange, methyl orange, naphthol yellow S, alizarin yellow GG, thiazole yellow G, alizarin yellow R, morganth orange I, tropaeolin O, But are not limited to, red, quinacridone red, chromophthalide, ultramarine red, Congo red, methyl red and allure red AR, cobalt violet, maganis violet, ultramarine violet, perorite violet, quinacridone violet, Zentian violet (methyl violet), anatase type titanium dioxide, rutile type titanium dioxide Wherein the coating composition is at least one selected from the group consisting of cerium, titanium, cadmium, cadmium, and cadmium.
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% By weight based on the total weight of the coating composition.
b) adding a solvent to the mixture prepared from the step a) and mixing
Wherein the acrylic-modified alkyd resin is represented by the general formula (1), and the number-average molecular weight is 1,000 to 10,000 and the polydispersity index is 5 to 15. The method according to claim 1,
[Chemical Formula 1]
R is an alkyl group having 8-18 carbon atoms, and n is 20-100.
Further comprising the step of pulverizing the mixture prepared from the step (a).
Wherein 1 to 5% by weight of the polymer dispersant and 0.5 to 10% by weight of the storage stabilizer are further added and mixed in the step a).
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| JP2006090971A (en) * | 2004-09-27 | 2006-04-06 | Chubu Electric Power Co Inc | Paint composition |
| JP2007302780A (en) | 2006-05-11 | 2007-11-22 | Kusakabe:Kk | Slow-hardenable quick dryable water paint capable of being used together with oil paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006090971A (en) * | 2004-09-27 | 2006-04-06 | Chubu Electric Power Co Inc | Paint composition |
| JP2007302780A (en) | 2006-05-11 | 2007-11-22 | Kusakabe:Kk | Slow-hardenable quick dryable water paint capable of being used together with oil paint |
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