Anticorrosion titanium dioxide pigments

Abstract

To provide an anticorrosive pigment for use in an aqueous coating composition. Also provided are an aqueous coating composition, a method of forming a dried anticorrosive pigment for use in an aqueous coating composition, and a method of forming an aqueous coating composition.SOLUTION: The anti-corrosion pigment comprises a plurality of titanium dioxide particles; in the range of about 0.05% to about 1% by weight, based on the total weight of the pigment, of at least one non-volatile organic hydroxylamine deposited on the surface of the titanium dioxide particles; and in the range of about 0.02% to about 1% by weight, based on the total weight of the pigment, of at least one organic dispersant deposited on the surface of the titanium dioxide particles. The pigment is in dry form.SELECTED DRAWING: None

Description

[Technical Field]

[0001] background This application is a continuation of previously filed U.S. Provisional Application No. 63 / 065,834, filed August 14, 2020 (referenced herein). No. 60 / 699,999, filed on Oct. 1, 2003, which is hereby incorporated by reference in its entirety. [Background technology]

[0002] Titanium dioxide (TiO2) is used in many types of products (water-based inks, latex paints, paper, and It is an effective inorganic pigment for use in paints, paints, and plastics. Titanium dioxide is a very effective white opacifying agent. Titanium dioxide is produced by either the sulfate or chloride process. and is typically manufactured in powder form.

[0003] In the sulfuric acid process for producing titanium dioxide, titanium slag ore is dissolved in sulfuric acid. , to form titanium sulfate. The titanium sulfate is then hydrolyzed to form hydrated titanium dioxide. The hydrated titanium dioxide is heated in a calciner to grow titanium dioxide crystals to pigment size. Lengthen.

[0004] In the chloride process for producing titanium dioxide, dried titanium dioxide ore is mixed with coke. The titanium halide gas (titanium tetrachloride) is supplied to the chlorinator together with titanium and chlorine. The titanium halide is then reacted with the resulting titanium halide in a specially designed reactor. , purified and oxidized at high temperatures to produce titanium dioxide particles having the desired particle size. Typically, aluminum chloride or some other co-oxidant is added to the halogen in the oxidation reactor. Titanium dioxide and titanium dioxide are then added to promote rutile formation and particle size control. The gaseous reaction products are cooled and the titanium dioxide particles are recovered.

[0005] Whether it is produced by the sulfuric acid method or the chloride method, However, the resulting titanium dioxide particles are typically coated with one or more inorganic materials. The properties and characteristics of pigments are modified or enhanced to suit specific applications. For example, pigment particles may contain compounds that function to improve the opacity, light stability, and durability of the pigment. It is often coated with a material used to coat titanium dioxide pigments. Examples of inorganic materials that can be used include alumina, silica, and zirconia.

[0006] The key properties that titanium dioxide pigments contribute to paints, paper, plastics and other products are: The hiding power of titanium dioxide pigments is determined by the pigment's: Based on the ability to scatter light in the base product (e.g., latex paint formulation) The pigment's ability to scatter light in the base product to which it is added The scattering power (in other words, the light scattering efficiency of the pigment) is affected by various factors, such as the particle size of the pigment, the relationship between the pigment particle and the surrounding environment, The difference in refractive index between the pigment particles and the base product can cause scattering. The effect of the dispersion on the pigment particles is dependent on the amount of dispersion (including the amount of dispersion that results in a large amount of dispersion) and the proximity of the pigment particles to each other.

[0007] A lesser known fact is that modified titanium dioxide pigments are used in coatings for metal substrates. In fact, modified titanium dioxide can also function as a corrosion inhibitor. Due to the hiding power that pigments can provide, anti-corrosion titanium dioxide pigments are often used in applications where the pigment is more traditional. It is used in place of anti-corrosion pigments.

[0008] Traditionally, metal substrates have been coated with anti-corrosion pigments such as lead-based and chromium-based pigments. Lead-based and chromium-based pigments are very effective in preventing corrosion. However, the fact that such pigments are based on toxic heavy metals is problematic. It could be an issue.

[0009] For this purpose, for example, metal phosphates (e.g., zinc phosphate), molybdates and silicates are used. Less toxic anticorrosive pigments based on calcium carbonate have been developed. These types of pigments can be expensive to manufacture and typically have large particle sizes (e.g., less than 1 mm). For example, such a coating may lack hiding power and opacity. Such pigments are often unsuitable for use in high gloss latex paint formulations. Furthermore, many of the anti-corrosion titanium dioxide pigments developed to date are only effective in solvent-based systems. There is a trend in paints and other coatings to move from solvent-based to water-based systems. However, to formulate anticorrosion pigments for use in aqueous systems, This is difficult because many of the components are sensitive to water and therefore not suitable for corrosion protection. It is possible.

[0010] Therefore, there is a need for effective anti-corrosion titanium dioxide pigments in waterborne coatings. do. Summary of the Invention

[0011] In a first aspect, an anti-corrosion pigment for an aqueous coating composition is provided. The anti-corrosion pigment comprises a plurality of titanium dioxide particles; and a coating layer formed on the surface of the titanium dioxide particles. at least one non-volatile component in the range of about 0.05% by weight to about 1% by weight based on the total weight of the pigment; and a soluble organic hydroxylamine deposited on the surface of the titanium dioxide particles. at least one organic dispersant in the range of about 0.02% to about 1% by weight, based on the total weight of the pigment; The organic dispersant includes a low molecular weight organic dispersant, an organic polymer dispersant, and the like. The low molecular weight organic dispersant is selected from the group consisting of phosphonic acids, phosphoric acids, phosphatic acids, and combinations thereof. from the group consisting of sulfonate-type carboxylic acids, salts of such compounds, and combinations thereof. The organic polymer is a molecule containing one or more functional groups derived from a compound selected from the group consisting of: Dispersants include phosphonic acids, phosphoric acids, phosphonate-type carboxylic acids, and compounds of this type. one or more compounds derived from a compound selected from the group consisting of: The pigment is in dry form.

[0012] In a second aspect, an aqueous coating composition is provided. The composition includes an aqueous mixture; and an anti-corrosion pigment dispersed in the aqueous mixture. The pigment is the anti-corrosion pigment of the first embodiment.

[0013] In a third embodiment, a dry anti-corrosion pigment for use in an aqueous coating composition is formed. The dry anticorrosion pigment formed by the method is a pigment according to the first aspect of the present invention. It is an anti-corrosion pigment.

[0014] In a fourth aspect, a method of forming an aqueous coating composition is provided. The aqueous coating composition formed by the above-mentioned second aspect of the aqueous coating composition is It is a composition. DETAILED DESCRIPTION OF THE INVENTION

[0015] Detailed Description The present disclosure may be practiced by reference to this detailed description and the examples contained herein. Numerous specific details are provided to provide a full understanding of various aspects of the present disclosure. However, claimed subject matter is not It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In order to avoid obscuring important features of the relationship being explained in the example The methods, procedures and components are not described in detail. Nothing herein should be construed as limiting the scope of the claims. The subject matter disclosed herein is susceptible to many modifications, variations, and variations, as will be apparent to those having the benefit of this disclosure. Modifications, combinations, and equivalents are possible.

[0016] Whenever a range is disclosed herein, the range is recited within that range. Furthermore, any number in a range extending between any two numbers in the range is included independently and individually. The lower and upper numbers of any range should be understood to be included within that stated range. It is.

[0017] Unless otherwise indicated, the terms used in this specification and the appended claims All numerical values ​​representing the amounts of components, properties such as molecular weight, and reaction conditions are given in all examples. It should be understood that the terms "about" and "about" are modified by the term "about."

[0018] In one aspect, an anti-corrosion pigment for use in an aqueous coating composition is provided as described herein. In another aspect, an aqueous coating composition is provided. In an embodiment, a method for forming a dry anti-corrosion pigment for use in an aqueous coating composition In yet another aspect, a method for forming an aqueous metallic undercoating composition is provided. The law is provided.

[0019] Anti-corrosion pigments for use in the aqueous coating compositions disclosed herein a plurality of titanium dioxide particles; and a pigment having a surface deposited on the surface of the titanium dioxide particles. at least one non-volatile organic compound in the range of about 0.05% to about 1% by weight based on the total weight of the composition; and the total weight of the pigment deposited on the surface of the titanium dioxide particles. The composition contains at least one organic dispersant in an amount ranging from about 0.02% to about 1% by weight based on the total weight of the composition. The organic dispersant may be a low molecular weight organic dispersant, an organic polymer dispersant, or a combination thereof. The low molecular weight organic dispersant is selected from the group consisting of phosphonic acid, phosphoric acid, phosphonate carboxylic acids of the formula (I), salts of such compounds, and combinations thereof. The organic polymer dispersant is a molecule containing one or more functional groups derived from a compound. are phosphonic acids, phosphoric acids, salts of such compounds, carboxylic acids in phosphonate form, and and combinations thereof. The pigment is in dry form.

[0020] As used in this specification and the appended claims, "aqueous coating composition" means "Anti-corrosion pigments for corrosion protection" are intended to provide corrosion protection when added to aqueous coating compositions exposed to corrosive environments. The coating composition is applied to the metal substrate to prevent corrosion caused by the coating. "Aqueous coating composition" means a pigment that is applied to a metal substrate. Any aqueous coating composition that reduces corrosion of metal substrates, including but not limited to A water-based coating composition applied to a metal substrate for the sole purpose of applied to the metal substrate as a precoat or basecoat prior to application of the coating composition. Aqueous coating compositions and aqueous compositions that are applied to metal substrates to paint the metal substrates "coating compositions" refers to coating compositions (such as water-based latex paints).

[0021] As used in this specification and the appended claims, "metal substrate" refers to a metal, alloy, or combinations thereof (including but not limited to iron, aluminum, aluminum alloys) and steel). For example, metal The substrate may be part of an industrial device or outdoor furniture. The environment may include, for example, environments with harsh conditions such as high humidity and / or high temperature, and These include environments exposed to water, acids, salts, and / or corrosive industrial pollutants.

[0022] As used in this specification and the appended claims, the phrase "titanium dioxide particles" refers to a surface active agent. "Deposited on the surface" refers to a material deposited directly or indirectly on the surface of the titanium dioxide particles, unless otherwise specified. means indirectly deposited.

[0023] For example, the titanium dioxide particles may have a rutile crystal structure, or a combination of anatase and rutile crystal structures. For example, the titanium dioxide particles may have a rutile crystal structure. The titanium dioxide particles can be formed by the chloride process or the sulfate process. For example, the titanium dioxide particles can be formed by the chloride process. Titanium particles can be formed by a sulfuric acid process. For example, the anti-corrosion pigment can be in the form of a dry powder. Or it may be in dry granular form.

[0024] For example, the titanium dioxide particles may have at least one inorganic coating deposited on their surfaces. For example, the inorganic coating(s) may include a metal oxide coating, metal hydroxide coating, and combinations thereof. For example, the inorganic coating(s) may be a silica coating, an aluminum coating, or a combination thereof. Lumina coating, aluminum phosphate coating, zirconia coating, titanium For example, the non-metallic coating may be selected from the group consisting of: The coating(s) may be silica coating, alumina coating, ruthenium coating, luconia coating, and combinations thereof.

[0025] The inorganic coating(s) may be a specific aqueous coating to which the anticorrosion pigment is added. To make the titanium dioxide particles more compatible with the coating composition, one or more These may be used to impart a number of properties and / or characteristics to the titanium dioxide particles. For example, the inorganic coating(s) may improve the wetting and dispersibility of the pigment particles. and may be used to help improve the opacity, light stability and durability of the pigment. do.

[0026] For example, the inorganic coating(s) may comprise a coating of the titanium dioxide particles and the inorganic About 0.5% to about 15% by weight based on the total weight of the coating(s). The inorganic coating may be deposited on the surface of the titanium dioxide particles in a range of amounts. The coating(s) may comprise the titanium dioxide particles and the inorganic coating(s). The titanium dioxide particles in an amount ranging from about 1% by weight to about 10% by weight based on the total weight of the components (number of components). can be deposited on the surface of

[0027] As used herein and in the appended claims, "non-volatile hydroxylamine" refers to a "Hydroxylamine" means a hydroxylamine having a boiling point of 250°C or higher. The "non-volatility" of the hydroxyl group when deposited on the surface of the titanium dioxide particles This makes it possible to keep the silamine stable.

[0028] As described above, the anti-corrosion pigment is deposited on the surface of the titanium dioxide particles. In the range of about 0.05% to about 1% by weight, based on the total weight of the pigment, of at least one nonvolatile For example, the anti-corrosion pigment may comprise an organic hydroxylamine. A small amount in the range of about 0.1% by weight to about 0.8% by weight based on the total weight of the pigment deposited on the surface. For example, the anticorrosion pigment may contain at least one nonvolatile organic hydroxylamine. , about 0.1 weight percent, based on the total weight of the pigment, deposited on the surface of the titanium dioxide particles. % to about 0.6% by weight of at least one non-volatile organic hydroxylamine. do.

[0029] For example, the non-volatile organic hydroxylamine is an alkylhydroxylamine (al hydroxylamines, aromatic amine hydroxyls, and and combinations thereof. For example, the nonvolatile organic hydrocarbons Silamine is 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol Pandiol, Tris(hydroxymethyl)-aminomethane, Triethanolamine, Tri Isopropanolamine, N-butyl-diethanolamine, dimethylglucamine, and The non-volatile organic hydroxylamine is selected from the group consisting of hydroxylamine, hydroxylamine derivatives ... An example of a suitable dimethylglucamine for use as or part of a dimethylglucamine is Genamin ( It is sold by Clariant Corporation under the trademark Gluco 50®.

[0030] As described above, the anti-corrosion pigment is deposited on the surface of the titanium dioxide particles. at least one organic dispersant in the range of about 0.02% to about 1% by weight, based on the total weight of the pigment; For example, the anti-corrosion pigment may comprise the following: at least one organic dispersant in the range of about 0.04% to about 0.8% by weight based on the total weight of the pigment; For example, the anti-corrosion pigment may include a coating agent deposited on the surface of the titanium dioxide particles. and about 0.04% by weight to about 0.6% by weight of at least one active ingredient, based on the total weight of the pigment. A dispersant may be included.

[0031] As used in this specification and the appended claims, a "low molecular weight organic dispersant" means: The "molecular weight" of a compound refers to an organic dispersant having a molecular weight of 1000 or less. The low molecular weight organic dispersant molecules containing one or more functional groups are The molecules may be polymeric, non-polymeric, and combinations thereof. For example, one or more The low molecular weight organic dispersant molecules containing the functional groups are polymer molecules. The low molecular weight organic dispersant molecules containing multiple functional groups are non-polymeric molecules.

[0032] For example, the phosphonate of the group of compounds from which the functional groups of the low molecular weight organic dispersant are derived. Phosphonic acids and phosphonates include 1-hydroxyethane 1,1-diphosphonic acid, aminotris(methyl Ethylenediaminetetra(methylenephosphonic acid), Ethylenediaminetetra(methylenephosphonic acid), Diethylenetriamine penta(methylene phosphonic acid), salts of such compounds, and mixtures thereof For example, the compound from which the functional group of the low molecular weight organic dispersant is derived may be selected from the group consisting of: The phosphoric acids and phosphates of this group are phosphate esters and mixed esters of alcohols. , phosphate esters and mixed esters of alcohol ethoxylates, such compounds For example, the low molecular weight organic dispersion may be selected from the group consisting of: The phosphonate-type carboxylic acid and phosphonate-type compounds of the group of compounds from which the functional groups of the agent are derived. Phosphonate-type carboxylic acid salts are phosphonate-type tricarboxylic acids, salts of such compounds and mixtures thereof. For example, the low molecular weight organic dispersant The phosphonate-type carboxylic acids and phosphonates of the group of compounds from which the functional groups of Carboxylate salts of the carboxylate type are 2-phosphonobutane-1,2,4-tricarboxylic acid, such compounds The compound may be selected from the group consisting of salts of the compounds, salts of the compounds, and mixtures thereof.

[0033] As used in this specification and the appended claims, the term "polymer" refers to a polymer that is A compound or chemical compound having repeating subunits (also called monomers) formed by Unless otherwise specified, the term "polymer" refers to a homopolymer, a mixture of The term "copolymers" includes and encompasses copolymers, terpolymers, etc. A "copolymer" is a polymer formed by polymerization of two or more different polymers that link together to form a polymer chain. A compound or mixture of compounds having a certain type of subunit (also called a monomer) means.

[0034] For example, the phosphonic acid, phosphoric acid, phosphonate-type carboxylic acid, one or more compounds derived from a compound selected from the group consisting of: The polymer molecules containing functional groups may be polyacrylic acid, polyacrylic acid copolymers ... salts of acrylic acid and polyacrylic acid copolymers, maleic acid copolymers, maleic acid copolymers The phosphonic acid may be selected from the group consisting of a suitable phosphonic acid, a salt of a phosphonic acid, and combinations thereof. Phosphoric acids, phosphonate-type carboxylic acids, salts of such compounds, and combinations thereof Suitable polymers comprising one or more functional groups derived from a compound selected from the group consisting of The molecule is a sulfonated styrene / maleic anhydride copolymer.

[0035] For example, the phosphonic acid of the group of compounds from which the functional groups of the polymer molecules are derived is , organic phosphonic acid monomers containing at least one carbon-carbon double bond, such compounds For example, the functional groups of the polymer molecules may be The phosphates of the following group of compounds are alkyl groups containing at least one carbon-carbon double bond. Phosphate esters and mixed esters of cellulose, containing at least one carbon-carbon double bond Phosphate esters and mixed esters of alcohol ethoxylates, including those of such compounds The monomers may be salts, and mixtures thereof.

[0036] For example, in one embodiment, the anti-corrosion pigment is deposited on the surface of the titanium dioxide particles. At least one pigment in the range of about 0.001% by weight to about 1% by weight based on the total weight of the pigment. As used herein and in the appended claims, the term "polyhydric alcohol" refers to a polyhydric alcohol. In this case, the polyhydric alcohol component is an organic compound containing two or more hydroxy (―OH) groups. It means things.

[0037] For example, the anti-corrosion pigment may be a titanium dioxide particle having a thickness of 1000 nm or less. at least one polyhydric alcohol in the range of about 0.05% to about 0.8% by weight based on the total weight For example, the anti-corrosion pigment may be deposited on the surface of the titanium dioxide particles. at least one of the pigments in a range of about 0.05% by weight to about 0.6% by weight based on the total weight of the pigment; For example, the anti-corrosion pigment may further comprise a polyhydric alcohol of the formula: In the range of about 0.1% by weight to about 0.6% by weight based on the total weight of the pigment deposited on the surface of the It may further comprise at least one polyhydric alcohol.

[0038] For example, the polyhydric alcohol(s) may be a linear alkyl polyol, an alkyl branched chain polyols, and combinations thereof. The polyhydric alcohol(s) may be trimethylolpropane, ditrimethylolpropane, Bread, glycerol, diglycerol, pentaerythritol, mannitol, and For example, the polyhydric alcohol (single or multiple) may be selected from the group consisting of the above polyhydric alcohols. The number may be glycerol.

[0039] For example, as shown by the examples below, In this case, the anti-corrosion pigments disclosed herein are resistant to corrosion due to exposure to a corrosive environment. The coating composition effectively prevents corrosion of metal substrates caused by The anti-corrosion pigment also provides hiding power to the aqueous coating composition, This is particularly useful with latex paint formulations.

[0040] The aqueous coating composition disclosed herein comprises an aqueous mixture, The aqueous coating composition includes an anti-corrosion pigment dispersed in an aqueous mixture. The anti-corrosion pigment used in the above is the anti-corrosion pigment disclosed herein, For example, the anticorrosion pigment is dried before being dispersed in the aqueous mixture. It is in a dried form.

[0041] For example, the aqueous mixture may include water, a surfactant, and a dispersant. The aqueous mixture may be a latex resin aqueous mixture.

[0042] As stated above, as used in this specification and the appended claims, "water-based coating" means "Coating composition" refers to any water-based coating composition that is applied to a metal substrate, including but not limited to: is not used as a coating, but is a water-based coating applied to metal substrates for the sole purpose of reducing corrosion of the metal substrate. coating composition, a precoat or base coat before applying a second coating composition Aqueous coating compositions that are applied as a coat to a metal substrate, and coating the metal substrate This includes water-based coating compositions (such as water-based latex paints) that are applied to metal substrates for For example, the aqueous coating composition may be a latex paint formulation. It is possible.

[0043] As noted above, as used in this specification and the appended claims, "metal substrate" means a is a metal, alloy or combination thereof (including but not limited to iron, aluminum, means any article or surface formed from any material (including aluminum alloys, and steel) For example, the metal substrate may be part of an industrial device or outdoor furniture. Possible corrosive environments include, for example, environments with harsh conditions such as high humidity and / or high temperature. These include environments exposed to water, acids, salts, and / or corrosive industrial pollutants. .

[0044] Drying for use in the aqueous coating compositions disclosed herein The method of forming an anti-corrosion pigment includes providing a plurality of titanium dioxide particles; providing one non-volatile organic hydroxylamine; and at least one organic dispersant. providing said non-volatile organic hydroxylamine(s); The titanium dioxide particles are present in an amount ranging from about 0.05% by weight to about 1% by weight based on the total weight of the material. depositing said organic dispersant(s) on a surface; The titanium dioxide particles are deposited on the surface thereof in an amount ranging from about 0.02% by weight to about 1% by weight, as a standard. said non-volatile organic hydroxylamine(s) and said organic compound The titanium dioxide particles having the powder(s) thereon are dried to form a dry preservative. forming a food pigment. The above dry corrosion inhibitors are The titanium dioxide particles described above in connection with the additive, non-volatile organic hydroxyl group The term "amine(s)" and "organic dispersant(s)" are used herein. Similarly, the anticorrosion pigment formed by the method is The anti-corrosion pigments disclosed in the specification are described above.

[0045] For example, the titanium dioxide particles may be raw titanium dioxide particles, The method comprises: mixing the non-volatile organic hydroxylamine and the organic dispersant with the untreated diacid The titanium dioxide particles are milled to a desired particle size before being deposited on the surface of the titanium dioxide particles. and filtering the crushed titanium dioxide particles, washing the particles, and then filtering the particles in a wet pigment filter. forming a cake, Here, the nonvolatile organic hydroxylamine and the organic dispersant are used in a dispersant pack. The titanium dioxide particles are mixed with the wet pigment filter cake. The substrate is deposited on the surface of the substrate.

[0046] The untreated titanium dioxide particles may be coated with an inorganic coating (e.g., silica) before being milled. The coating may be coated with a titanium dioxide, alumina and / or zirconia coating.

[0047] For example, the method comprises: drying the wet pigment filter cake to form a dry pigment filter cake; To do; crushing the dried pigment filter cake to form a crushed pigment filter cake; to do; and steam atomizing the crushed filter cake to form the anti-corrosion pigment; It may further include:

[0048] For example, in one embodiment, the aqueous coating composition disclosed herein The method of forming a dry anticorrosion pigment for use in an article comprises adding at least one polyvalent providing an alcohol; and mixing said polyhydric alcohol(s) with said pigment. on the surface of the titanium dioxide particles in an amount ranging from about 0.001% by weight to about 1% by weight based on the total weight of In this embodiment, the polyhydric alcohol (single or multiple) is deposited on the surface of the polyhydric alcohol. said non-volatile organic hydroxylamine(s); said organic dispersion and depositing thereon the agent(s) and the polyhydric alcohol(s). The titanium dioxide particles are dried. The organic hydroxyl groups described above in connection with the dry anticorrosion pigments are The same as the amine(s) and are disclosed herein. The anti-corrosion pigment formed by the method is The fee is listed above.

[0049] The method of forming the aqueous coating composition disclosed herein comprises: Preparing a mixture; Preparing an anti-corrosion pigment, said anti-corrosion pigment being in dry form. and dispersing said anti-corrosion pigment in said aqueous mixture.

[0050] For example, the aqueous mixture used in the method may contain water, a surfactant, and a dispersant. For example, the aqueous mixture used in the method may comprise a latex resin aqueous solution. It may be a mixture of sexes.

[0051] The anticorrosion pigment used in the method is the same as the anticorrosion pigment described above, The aqueous coating composition formed by the method is disclosed in the specification. is the aqueous coating composition described above and disclosed herein.

[0052] For example, in one embodiment, an anti-corrosion pigment for an aqueous coating composition is provided. In this embodiment, the anti-corrosion pigment comprises a plurality of titanium dioxide particles; about 0.05% by weight to about 1% by weight, based on the total weight of the pigment, deposited on the surface of the tan particles at least one nonvolatile organic hydroxylamine in the range of A small amount in the range of about 0.02% by weight to about 1% by weight based on the total weight of the pigment deposited on the surface. at least one organic dispersing agent; and deposited on the surface of the titanium dioxide particles. at least one polyhydric alcohol in the range of about 0.001% to about 1% by weight based on the total weight of the material; The organic dispersant(s) include low molecular weight organic dispersants, organic polymer dispersants, The low molecular weight organic dispersant is selected from the group consisting of phosphatidylcholinesterase, ... Sulfonic, phosphoric, and phosphonate-type carboxylic acids, salts of such compounds, and their a molecule comprising one or more functional groups derived from a compound selected from the group consisting of a combination of The organic polymer dispersant is a phosphonic acid, phosphoric acid, phosphonate-type carboxylic acid, , salts of such compounds, and combinations thereof. The pigment is in dry form.

[0053] For example, in another embodiment, an aqueous coating composition is provided. wherein the aqueous coating composition comprises an aqueous mixture; and a dispersion in the aqueous mixture. The anti-corrosion pigment comprises a plurality of titanium dioxide particles; The range of about 0.05% by weight to about 1% by weight based on the total weight of the pigment deposited on the surface of the particle. at least one nonvolatile organic hydroxylamine surrounding the surface of the titanium dioxide particles; At least about 0.02% by weight to about 1% by weight of the pigment deposited on the surface of the pigment. and an organic dispersant; and a pigment having a thickness of 100 nm or less that is deposited on the surface of the titanium dioxide particles. at least one polyhydric alcohol in the range of about 0.001% by weight to about 1% by weight based on the total weight of the The organic dispersant(s) may include low molecular weight dispersants, organic polymer dispersants, and and combinations thereof. The low molecular weight organic dispersant is selected from the group consisting of phosphonic acid , phosphoric acid, phosphonate-type carboxylic acids, salts of such compounds, and combinations thereof is a molecule containing one or more functional groups derived from a compound selected from the group consisting of: The organic polymer dispersant may be a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, or the like. and combinations thereof. or a polymer molecule containing multiple functional groups. The pigment is in dry form.

[0054] In yet another embodiment, a dry corrosion inhibitor for use in an aqueous coating composition is provided. In this embodiment, a method of forming a coating is provided, comprising: The dry anticorrosion pigment for use comprises a plurality of titanium dioxide particles; providing one non-volatile organic hydroxylamine; and at least one organic dispersant. providing at least one polyhydric alcohol; hydroxylamine(s) at about 0.05% by weight based on the total weight of the pigment; depositing on the surface of said titanium dioxide particles an amount ranging from about 1% by weight to about 1% by weight of said organic dispersion; agent(s) in the range of about 0.02% by weight to about 1% by weight based on the total weight of the pigment. depositing on the surface of said titanium dioxide particles in an amount of or more) in an amount ranging from about 0.001% by weight to about 1% by weight based on the total weight of the pigment. and depositing said non-volatile organic hydroxyl group on the surface of titanium oxide particles. amine(s), said organic dispersant(s) and said polyhydric alcohol drying the titanium dioxide particles having the particle(s) deposited thereon; forming the dry anticorrosion pigment. The organic dispersant(s) comprise a low molecular weight organic dispersants, organic polymeric dispersants, and combinations thereof. The low molecular weight organic dispersant is a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, or and combinations thereof. The organic polymer dispersant is a molecule containing one or more functional groups. acids, phosphonate-type carboxylic acids, salts of such compounds, and combinations thereof. is a polymer molecule containing one or more functional groups derived from a compound selected from the group consisting of The pigment formed by the method is in dry form.

[0055] In yet another embodiment, a method of forming an aqueous coating composition is provided. In this embodiment, the method of forming the aqueous coating composition comprises preparing an aqueous mixture. providing an anti-corrosion pigment, said anti-corrosion pigment being in dry form; and and dispersing the anti-corrosion pigment in the aqueous solution. titanium dioxide particles; deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment; in the range of about 0.05% to about 1% by weight of at least one nonvolatile organic hydroxyl group min; deposited on the surface of the titanium dioxide particles, about 0. at least one organic dispersant in the range of 0.2% to about 1% by weight; and said titanium dioxide particles in the range of about 0.001% by weight to about 1% by weight based on the total weight of the pigment deposited on the surface of the The organic dispersant includes at least one polyhydric alcohol. polymeric dispersants, and combinations thereof. The powders contain phosphonic acids, phosphoric acids, carboxylic acids of the phosphonate type, salts of such compounds, and and combinations thereof. The organic polymer dispersant is a molecule comprising phosphonic acid, phosphoric acid, or phosphonate type. a compound selected from the group consisting of carboxylic acids, salts of such compounds, and combinations thereof; The polymer molecule contains one or more functional groups derived from the compound.

[0056] The following illustrative examples illustrate specific embodiments consistent with the present disclosure. Concentrations and percentages are not intended to limit the scope of the appended claims. are by weight unless otherwise indicated. [Example]

[0057] Example 1 - Preparation of Silica and Alumina Treated Titanium Dioxide Filter Cake Particulate titanium dioxide formed by the chloride process containing 1.0% alumina in the crystal lattice. The pigment particles were dispersed in the presence of 0.075% sodium hexametaphosphate dispersant, and the pH of the dispersion was adjusted to 9. Disperse the solids content in water with enough sodium hydroxide to adjust the pH to 5 or higher. An aqueous dispersion with a 35% solubility was obtained. The resulting slurry was analyzed using a Microtrac X100 particle size analyzer. The titanium dioxide particles are then sanded until 94% of the particles are less than 0.63 microns in size. The powder was subjected to milling (zircon sand and pigment weight ratio was 4:1).

[0058] The resulting slurry (diluted to 30% solids) was heated to 75°C and then diluted to 3.0°C. % sodium silicate (calculated as the weight of silica relative to the final pigment) The sodium silicate was added over a 20 minute period. The temperature was maintained at 75°C. The pH of the slurry was adjusted to pH 5.5 by slowly adding sulfuric acid over 55 minutes. The slurry was digested for 15 minutes, after which 1.6 wt. % sodium aluminate was added. (calculated as weight of alumina relative to final pigment) was added to the slurry for 10 minutes. The pH of this slurry was adjusted to 8 by the concomitant addition of concentrated sulfuric acid. The slurry was digested at 75°C for 15 minutes. The pH of the slurry was adjusted to 6.2 with concentrated sulfuric acid. The slurry was filtered while still hot. The collected filtrate was washed with water (preheated to 60°C). a wet titanium dioxide filter comprising said titanium dioxide particles having a titanium coating. -Got cake.

[0059] Example 2 - Preparation of Control Titanium Dioxide Pigment The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The filter cake was weighed into a stainless steel pot to obtain the desired volume. Ionized water was added to form a pigment slurry. This slurry was then added with 10.61 g of 33% trime The aqueous ethylenediaminepropane solution was added and thoroughly mixed into the slurry. The slurry was then spray dried to obtain a dried pigment. The steam injector pressure was then set to 160 psi and the micronizer ring pressure was set to 160 psi. The power was set at 118 psi and a steam to pigment weight ratio of 2.5:1 was used for steam atomization.

[0060] Example 3 - Preparation of the Corrosion-Resistant Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The amount was measured into a stainless steel pot. 10.61g of 33% trimethylol Aqueous diisopropyl alcohol, 2.0 g of glycerol, 4.0 g of tris(hydroxymethyl)aminomethane (TRIS), 1.75 g of a 40% aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt, and 1.48 g of Pat-Add 603 (a polymeric dispersant from Patcham Ltd.) to form a chemical mixture. was prepared.

[0061] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0062] Example 4 - Preparation of the Anticorrosive Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The amount was measured into a stainless steel pot. 10.61g of 33% trimethylol Aqueous diisopropyl alcohol, 2.0 g glycerol, 5.0 g triethanolamine, 1.75 g 40% 2- Phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt aqueous solution, and 1.48 g of Pat-Add 60 3 (a polymeric dispersant from Patcham Ltd.) was used to prepare the chemical mixture.

[0063] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0064] Example 5 - Preparation of the Anticorrosive Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The amount was measured into a stainless steel pot. 10.61g of 33% trimethylol Aqueous isopropanol solution, 2.0 g glycerol, 6.0 g triisopropanolamine, 1.75 g 4 0% aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt, and 1.48 g of Pat-A A chemical mixture was prepared using dd 603 (a polymeric dispersant from Patcham Ltd.).

[0065] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0066] Example 6 - Titanium dioxide slurry preparation 6a. Slurry Preparation for Control Titanium Dioxide Pigment of Example 2: The control titanium dioxide pigment of Example 2 was treated with a hydrophilic acrylic acid-based copolymer dispersant and The pigment was wetted with deionized water along with a hydroxylamine-based co-dispersant. The slurry was then milled at high speed with a Cowles blade for 10 minutes. The solids content of the slurry was It was adjusted to 76.5%.

[0067] 6b. Slurry Preparation of Anticorrosive Titanium Dioxide Pigments for Examples 3-5 For each of the anti-corrosion titanium dioxide pigments in Examples 3-5, approximately 300 g of pigment was added to 92.2 g of deionized water. The mixture was added to water and stirred with a propeller blade. The solid content of each slurry was 76.5%. It was.

[0068] Example 7 - Testing of Titanium Dioxide Pigment Slurry of Example 6 Each of the titanium dioxide pigment slurries prepared in Example 6 can be used to apply directly to metal. Direct-to-metal (DTM) anticorrosive gloss latex coatings were prepared. The formulation of the filling is shown in Table 1 below.

[0069] "Avanse 200" is a DTM latex resin from Dow Chemical.

[0070] "Tamol 165A" is a hydrophobic dispersant from Dow Chemical.

[0071] Surfynol "CT-111" is a multipurpose surfactant from Evonik.

[0072] "BYK-24" is an antifoam agent from BYK Chemie.

[0073] "Texanol" is a coalescent from Eastman.

[0074] "Acrysol RM-2020NPR" and "Acrysol RM-8W" are rheology grades from Dow Chemical. It is a modifier.

[0075] "Proxel GXL" is a BIT-based biocide from Lonza.

[0076] The ammonia solution listed is a pH adjuster, and the sodium nitrite listed is It is a flash rust inhibitor. Table 1. Water-based DTM gloss latex coating formulations [Table 1]

[0077] The resulting coating was applied to a 4" x 6" steel Q-PANEL for corrosion testing. The steel panel was degreased twice with acetone. A 3-inch Bird-type drawer with a 6-mil gap was used to form the film. The coated panels were allowed to dry under ambient conditions for one week, after which they were exposed to light. Cover the exposed metal with duct tape, then use a knife to remove the An X-shaped cross was cut through the coating film. The panels were subjected to a 600-hour continuous salt spray test (ASTM B117 method).

[0078] DTM gloss latex coatings available commercially from major domestic coating companies was tested in the same manner to serve as a reference.

[0079] When this steel panel was observed for rust, it was found that the anticorrosion properties of Examples 3, 4 and 5 The DTM coating formed with the pigment (the anti-corrosion pigment disclosed herein) It is significantly more corrosion resistant than the control pigment in Example 2 and the commercial DTM gloss latex coating. It was clear that it was superior to

[0080] Example 8 - Testing of Titanium Dioxide Pigment Slurries The control titanium dioxide pigment of Example 2 and the corrosion-resistant titanium dioxide pigment of Example 3 were applied directly to metal. Prepares direct-to-metal (DTM) anti-corrosion semi-gloss latex coatings The formulations for each coating are shown in Table 3 below.

[0081] "Tamol 165A" is a hydrophobic dispersant from Dow Chemical.

[0082] "Surfynol CT-111" is a multipurpose surfactant from Evonik.

[0083] "Tego 810" is a defoamer from Evonik.

[0084] "Minex7" is a bulking agent from Unimin.

[0085] "Avanse 200" is a DTM latex resin from Dow Chemical.

[0086] "BYK-24" is an antifoam agent from BYK Chemie.

[0087] "Texanol" is a coalescent from Eastman.

[0088] "Acrysol RM-2020NPR" and "Acrysol RM-8W" are rheology grades from Dow Chemical. It is a modifier.

[0089] "Proxel GXL" is a BIT-based biocide from Lonza.

[0090] The ammonia solution listed is a pH adjuster, and the sodium nitrite listed is It is a flash rust inhibitor. Table 2. Water-based DTM semi-gloss latex paint formulations. [Table 2]

[0091] The resulting coating was applied to a 4" x 6" steel Q-PANEL for corrosion testing. The steel panel was degreased twice with acetone. A 3-inch Bird-type drawer with a 6-mil gap was used to form the film. The coated panels were allowed to dry under ambient conditions for one week, after which they were exposed to light. Cover the exposed metal with duct tape, then use a knife to remove the An X-shaped cross was cut through the coating film. The panels were subjected to a 600-hour continuous salt spray test (ASTM B117 method).

[0092] Two DTM semi-gloss latex coatings commercially available from major domestic coating companies The material was tested in the same manner for use as a reference.

[0093] The steel panel was inspected for rust and found to be free of the anti-corrosion pigment of Example 3 (referred to herein as The DTM coating formed with the anticorrosion pigment disclosed in Example 1 was compared with the control pigment of Example 2. Significantly better corrosion resistance than commercially available DTM gloss latex coating references It was clear that:

[0094] Example 9 - Preparation of Titanium Dioxide Control Pigment Slurry The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The filter cake was weighed into a stainless steel pot to obtain the desired volume. Ionized water was added to form a titanium dioxide slurry.

[0095] Approximately 3.5 g of trimethylolpropane and 4.0 g of tris(hydroxymethyl)aminomethyl The ethanol was dissolved in 15 g of water to form a chemical solution. This chemical mixture was then diluted with titanium dioxide. The treated titanium dioxide slurry was then mixed into the spray drum. This dried pigment was then subjected to steam injector pressure. The steam pressure was set at 160 psi and the micronizer ring pressure was set at 118 psi to achieve a steam ratio of 2.5:1. A vapor to pigment weight ratio was used for vapor atomization.

[0096] Example 10 - Preparation of Titanium Dioxide Control Pigment Slurry The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The filter cake was weighed into a stainless steel pot to obtain the desired volume. Ionized water was added to form a titanium dioxide slurry.

[0097] 10.61 g of 33% aqueous trimethylolpropane and 1.75 g of 40% 2-phosphonobutane-1,2,4 A chemical mixture was prepared using an aqueous solution of tetrasodium tricarboxylic acid.

[0098] This chemical mixture was then mixed into the titanium dioxide slurry. The tungsten slurry was then spray dried to obtain a dried pigment. Then, the steam injector pressure was set to 160 psi, and the micronizer The spray pressure was set at 118 psi and a steam to pigment weight ratio of 2.5:1 was used for steam atomization.

[0099] Example 11 - Preparation of the Anticorrosive Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The amount was measured into a stainless steel pot. 10.61g of 33% trimethylol Aqueous diisopropyl alcohol, 2.0 g of glycerol, 1.0 g of tris(hydroxymethyl)aminomethane , 1.75 g of a 40% aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt, and 1. A chemical mixture was prepared using 48 g of Pat-Add 603 (a polymeric dispersant from Patcham Ltd.). Ta.

[0100] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0101] Example 12 - Preparation of the Corrosion-Resistant Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The amount was measured into a stainless steel pot. 10.61g of 33% trimethylol Aqueous diisopropyl alcohol, 2.0 g of glycerol, 8.0 g of tris(hydroxymethyl)aminomethane , 1.75 g of a 40% aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt, and 1. A chemical mixture was prepared using 48 g of Pat-Add 603 (a polymeric dispersant from Patcham Ltd.). Ta.

[0102] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0103] Example 13 - Preparation of the Anticorrosive Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 1 was mixed with a weight equivalent to 1000 g of dry pigment. The amount was measured into a stainless steel pot. 10.61g of 33% trimethylol Aqueous diisopropyl alcohol, 2.0 g of glycerol, 8.0 g of tris(hydroxymethyl)aminomethane , 3.75 g of a 40% aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt, and 1. A chemical mixture was prepared using 48 g of Pat-Add 603 (a polymeric dispersant from Patcham Ltd.). Ta.

[0104] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0105] Example 14 - Preparation of Zirconia and Alumina Treated Titanium Dioxide Filter Cake Particulate titanium dioxide formed by the chloride process, containing 0.8% alumina in the crystal lattice. The pigment particles were dispersed in water to form a slurry. The resulting slurry was analyzed using a Microtrac X1 92% of the titanium dioxide particles have a particle size of less than 0.63 microns as determined by a 00 particle size measuring device The pigment was then sanded and milled (zircon sand and pigment weight ratio was 4:1) until the pigment was I did it.

[0106] The resulting slurry (diluted to 30% solids) was heated to 65°C and then diluted to 0.3°C. % by weight of sodium hexametaphosphate (calculated as weight of phosphorus pentoxide relative to final pigment) The sodium hexametaphosphate was added over a period of 20 minutes. 0.3% by weight of zirconium oxychloride (calculated as the weight of zirconia relative to the final pigment) % sodium aluminate was added to the slurry over a 10 minute period. The weight of alumina (calculated as the weight of alumina relative to the final pigment) was added to the slurry for 10 minutes. The pH of the slurry was maintained at a level below 11.0. The slurry was digested for 15 minutes and the pH was adjusted to 6.3 with hydrochloric acid. The resulting filtrate was washed with water (preheated to 60°C). The titanium dioxide particles have a zirconia and alumina coating on the surface. , a wet titanium dioxide filter cake was obtained.

[0107] Example 15 - Preparation of Control Titanium Dioxide Pigment The wet titanium dioxide filter cake from Example 14 was mixed with 1000 g of dry pigment equivalent The filter cake was weighed into a stainless steel pot to obtain the desired weight. Deionized water was added to form a pigment slurry. This slurry was then added with 10.61 g of 33% trimethylsilyl methylcellulose. The aqueous methylolpropane solution was added and thoroughly mixed into the slurry. The slurry was then spray dried to obtain a dried pigment. Then, the steam injector pressure was set to 160 psi, and the micronizer ring The pressure was set at 118 psi and a steam to pigment weight ratio of 2.5:1 was used for steam atomization.

[0108] Example 16 - Preparation of the Corrosion-Resistant Titanium Dioxide Pigment Disclosed herein The wet titanium dioxide filter cake from Example 14 was mixed with 1000 g of dry pigment equivalent The weight of the solution was measured into a stainless steel pot. 1.0 g of potassium carbonate, 10 0.61g of 33% trimethylolpropane aqueous solution, 2.0g of glycerol, 4.0g of tris(hydroxybenzoate) (dimethyl)aminomethane, 3.5g of 40% 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium and 1.48 g of Pat-Add 603 (a polymeric dispersant from Patcham Ltd.). , a chemical mixture was prepared.

[0109] The chemical mixture was then mixed with the filter cake. The treated titanium dioxide slurry was fluidized to form a slurry without additional water. The resulting pigment was then spray dried to obtain a dried pigment. Set the steam injector pressure to 160 psi and the micronizer ring pressure to 118 p.s. The steam atomization was performed using a steam to pigment weight ratio of 2.5:1, set at si.

[0110] Example 17 - Testing of Titanium Dioxide Pigment Slurries The control titanium dioxide pigments of Examples 2, 9, 10 and 15, and the titanium dioxide pigments of Examples 11-13 and 16 Anti-corrosion titanium dioxide pigments are used in direct-to-metal (DTM) anti-corrosion coatings. The Migros latex coatings were prepared using the following formulas: This is shown in Table 3.

[0111] "Tamol 165A" is a hydrophobic dispersant from Dow Chemical.

[0112] "Surfynol CT-111" is a multipurpose surfactant from Evonik.

[0113] "Tego 810" is a defoamer from Evonik.

[0114] "Minex7" is a bulking agent from Unimin.

[0115] "Avanse 200" is a DTM latex resin from Dow Chemical.

[0116] "BYK-24" is an antifoam agent from BYK Chemie.

[0117] "Texanol" is a coalescent from Eastman.

[0118] "Acrysol RM-2020NPR" and "Acrysol RM-8W" are rheology grades from Dow Chemical. It is a modifier.

[0119] "Proxel GXL" is a BIT-based biocide from Lonza.

[0120] The ammonia solution listed is a pH adjuster, and the sodium nitrite listed is It is a flash rust inhibitor. Table 3. Water-based DTM gloss latex paint formulations from dry TiO2 pigments [Table 3]

[0121] The resulting coating was applied to a 4" x 6" steel Q-PANEL for corrosion testing. The steel panel was degreased twice with acetone. A 3-inch Bird-type drawer with a 6-mil gap was used to form the film. The coated panels were allowed to dry under ambient conditions for one week, after which they were exposed to light. Cover the exposed metal with duct tape, then use a knife to remove the An X-shaped cross was cut through the coating film. The panels were subjected to a 600-hour continuous salt spray test (ASTM B117 method).

[0122] The steel panel was inspected for rust and found to be rust-resistant, with the anti-rust properties disclosed herein. DTM coatings formed with corrosion pigments (Examples 11, 12, 13 and 16) were tested. It is clear that the corrosion resistance is significantly better than that of the control pigments (Examples 2, 9, 10 and 15). It was.

[0123] Thus, the pigments, compositions and methods described herein have the stated objects and advantages, as well as other The pigments, compositions and compositions of the present disclosure are well adapted to attain the objects and advantages inherent therein. Modifications to the method are possible and will be apparent to those skilled in the art having the benefit of the teachings herein. The specific embodiments disclosed above may be implemented in different but equivalent ways. The embodiments disclosed above are merely illustrative. The pigments, compositions, and compositions described herein may be changed or modified, and all such variations are within the scope of the present invention. and the pigment, The compositions and methods may be referred to as "comprising" or "including" various components or steps. Anything described with the words "containing," "having," or "including" Although the pigments, compositions and methods are also, in some instances, Ingredients and steps "consist essentially of" or "consisting of" When a numerical range with upper and lower limits is disclosed, However, any numerical value within that range and any range contained within that range may be specifically disclosed. In particular, the compounds disclosed herein ("about a to about b" or, similarly, "approximately a to b" or, similarly, "approximately Any range of values ​​(of the form "(approximately) a~b") is included within a broader range of values. It should be understood that all values ​​and ranges set forth in the claims are expressly set forth herein. Terms in this scope are not intended to be used in any way that would justify their use unless expressly and clearly stated otherwise by the patent owner. has its plain and ordinary meaning.

Claims

1. 1. An anti-corrosion pigment for an aqueous coating composition, comprising: a plurality of titanium dioxide particles; About 0.05 wt. % of the pigment is deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment. at least one non-volatile organic hydroxylamine in the range of from about 1% by weight to about 1% by weight; and About 0.02 weight percent of the pigment is deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment. % to about 1% by weight of at least one organic dispersant; Here, the organic dispersant includes low molecular weight organic dispersants, organic polymer dispersants, and the like. and a combination thereof, The low molecular weight organic dispersant is a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, and combinations thereof. a molecule containing one or more functional groups; The organic polymer dispersant is selected from the group consisting of phosphonic acid, phosphoric acid, phosphonate-type carboxylic acid, and combinations thereof. a polymer molecule containing one or more functional groups; the pigment is in dry form; Anti-corrosion pigment.

2. The titanium dioxide particles have at least one inorganic coating deposited on their surface. wherein the inorganic coating(s) is / are a metal oxide coating, a metal water coating, 10. The method of claim 1, wherein the coating is selected from the group consisting of: a tungsten oxide coating; an oxide coating; and combinations thereof. Anti-corrosion pigment.

3. The inorganic coating(s) may be a silica coating, an alumina coating, or the like. a coating, a zirconium coating, and a combination thereof.

3. The anticorrosion pigment according to claim 2.

4. The nonvolatile organic hydroxylamine may be an alkylhydroxylamine, an aromatic hydroxylamine, or an alkyl hydroxylamine.

2. The anti-inflammatory agent of claim 1, wherein the anti-inflammatory agent is selected from the group consisting of: hydroxylamine, methylpropanol ... Corrosion pigment.

5. The non-volatile organic hydroxylamine is 2-amino-2-methyl-1,3-propanediol , 2-amino-2-ethyl-1,3-propanediol, tris(hydroxymethyl)aminomethane, Triethanolamine, triisopropanolamine, N-butyl-diethanolamine, dimethylglucamine, and combinations thereof. Anti-corrosion pigment.

6. The phosphonic acid and the group of compounds from which the functional groups of the low molecular weight organic dispersant are derived and phosphonates, such as 1-hydroxyethane 1,1-diphosphonic acid, aminotris(methylene phosphonic acid), phosphonic acid), ethylenediaminetetra(methylenephosphonic acid), diethylenetriaminepenta( methylene phosphonic acid), salts of such compounds, and mixtures thereof. The anticorrosion pigment according to claim 1 , wherein

7. The phosphoric and phosphonic acids of the group of compounds from which the functional groups of the low molecular weight organic dispersant are derived. Phosphates include phosphate esters and mixed esters of alcohols, alcohol ethoxylates Phosphate esters and mixed esters of, salts of such compounds, and mixtures thereof 2. The anti-corrosion pigment of claim 1, selected from the group consisting of:

8. The phosphonate-type carboxylic acid of the compound from which the functional group of the low molecular weight organic dispersant is derived carboxylic acid salts of the phosphonate type, tricarboxylic acid salts of the phosphonate type, 2. The anti-inflammatory agent of claim 1, selected from the group consisting of: salts of such compounds; and mixtures thereof. Corrosion pigment.

9. The phosphonate-type carboxylic acid of the compound from which the functional group of the low molecular weight organic dispersant is derived The carboxylic acid salts of 2-phosphonobutane-1,2,4-tricarboxylic acid and phosphonate types are , salts of such compounds, and mixtures thereof. The anti-corrosion pigment described.

10. The phosphonic acid of the group of compounds from which the functional groups of the polymer molecules are derived is at least Monomers of organic phosphonic acids containing one carbon-carbon double bond, and salts of such compounds 10. The anticorrosion pigment of claim 1, wherein the anticorrosion pigment is selected from the group consisting of methyl methyl acrylate, methyl meth ...

11. The phosphate of the group of compounds from which the functional groups of the polymer molecules are derived is at least Phosphate esters and mixed esters of alcohols containing one carbon-carbon double bond, at least Phosphate esters of alcohol ethoxylates containing at least one carbon-carbon double bond and and mixed esters, salts of such compounds, and mixtures thereof.

2. The anticorrosion pigment according to claim 1.

12. about 0.001 based on the total weight of the pigment deposited on the surface of the titanium dioxide particles 10. The method of claim 1, further comprising: Anti-corrosion pigments.

13. The polyhydric alcohol(s) may be selected from the group consisting of alkyl linear polyols, alkyl branched polyols, and the like.

13. The preservative of claim 12, selected from the group consisting of: polyols, and combinations thereof. Food pigment.

14. The polyhydric alcohol(s) may be trimethylolpropane, ditrimethylol propane, glycerol, diglycerol, pentaerythritol, mannitol, 14. The anti-corrosion pigment of claim 13, selected from the group consisting of:

15. an aqueous mixture; an anti-corrosion pigment dispersed in the aqueous mixture; 1. An aqueous coating composition comprising: The anti-corrosion pigment is a plurality of titanium dioxide particles; About 0.05 wt. % of the pigment is deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment. at least one non-volatile organic hydroxylamine in the range of from about 1% by weight to about 1% by weight; and About 0.02 weight percent of the pigment is deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment. % to about 1% by weight of at least one organic dispersant; Here, the organic dispersant includes low molecular weight organic dispersants, organic polymer dispersants, and the like. and a combination thereof, The low molecular weight organic dispersant is a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, and combinations thereof. a molecule containing one or more functional groups; The organic polymer dispersant is selected from the group consisting of phosphonic acid, phosphoric acid, phosphonate-type carboxylic acid, and combinations thereof. a polymer molecule containing one or more functional groups, Aqueous coating compositions.

16. The anti-corrosion pigment is deposited on the surface of the titanium dioxide particles, and the total weight of the pigment is Further comprising at least one polyhydric alcohol in the range of about 0.001% to about 1% by weight based on the total weight of the composition. The aqueous coating composition of claim 1 .

17. 1. A method for forming a dry anti-corrosion pigment for use in an aqueous coating composition, comprising: providing a plurality of titanium dioxide particles; providing at least one non-volatile organic hydroxylamine; providing at least one organic dispersant; The nonvolatile organic hydroxylamine is added in an amount of about 0.05 wt. based on the total weight of the pigment. % to about 1% by weight of the titanium dioxide particles; and The organic dispersant is added in an amount ranging from about 0.02% to about 1% by weight, based on the total weight of the pigment. on the surface of the titanium dioxide particles; and The nonvolatile organic hydroxylamine and the organic dispersant are then mixed together. drying the titanium oxide particles to form said dried anti-corrosion pigment. Including, Here, the organic dispersant includes low molecular weight organic dispersants, organic polymer dispersants, and the like. and a combination thereof, The low molecular weight organic dispersant is a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, or and combinations thereof. a molecule containing one or more functional groups; The organic polymer dispersant may be a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, or a carboxylic acid thereof. and combinations thereof. a polymer molecule containing one or more functional groups, method.

18. 18. The method of claim 17, wherein the titanium dioxide particles are untreated titanium dioxide particles. And, The non-volatile organic hydroxylamine and the organic dispersant are mixed with the untreated dioxide Before being deposited on the surface of the titanium dioxide particles, the titanium dioxide particles are crushed to a desired particle size, The crushed titanium dioxide particles are filtered, washed and placed on a wet pigment filter case. Forming Ki Further comprising: wherein the nonvolatile organic hydroxylamine and the organic dispersant are The titanium dioxide is removed by mixing the package with the wet pigment filter cake. deposited on the surface of the silicon particles, method.

19. drying the wet pigment filter cake to form a dry pigment filter cake; To do; crushing the dried pigment filter cake to form a crushed pigment filter cake; and steam atomizing the crushed filter cake to form the anti-corrosion pigment; 20. The method of claim 18, further comprising:

20. Preparing an aqueous mixture; Providing an anti-corrosion pigment in dry form; and dispersing the anti-corrosion pigment in the aqueous mixture; 1. A method of forming an aqueous coating composition comprising: The anti-corrosion pigment is a plurality of titanium dioxide particles; About 0.05 wt. % of the pigment is deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment. at least one non-volatile organic hydroxylamine in the range of from about 1% by weight to about 1% by weight; and About 0.02 weight percent of the pigment is deposited on the surface of the titanium dioxide particles, based on the total weight of the pigment. % to about 1% by weight of at least one organic dispersant Including, Here, the organic dispersant includes low molecular weight organic dispersants, organic polymer dispersants, and the like. and a combination thereof, The low molecular weight organic dispersant is a phosphonic acid, a phosphoric acid, a phosphonate-type carboxylic acid, and combinations thereof. a molecule containing one or more functional groups; The organic polymer dispersant is selected from the group consisting of phosphonic acid, phosphoric acid, phosphonate-type carboxylic acid, and combinations thereof. a polymer molecule containing one or more functional groups, method.

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