RU2395546C1 - Iron oxide based pigment - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention can be used in making paint, construction and ceramic materials, glass, enamel, plastic and rubber. The iron oxide based pigment contains two fractions of iron (III) oxide. The first fraction has a plastic structure with particle size not smaller than 20 mcm. The second fraction consists of particles of different shapes with size not bigger than 20 mcm. The said components of the pigment are in the following ratio in wt %: iron (III) oxide of the first fraction with plastic structure 3-97, iron (III) oxide of the second fraction with particles of different shapes 97-3.

EFFECT: invention enables to obtain a grey coloured pigment with metallic lustre to red, increases corrosion resistance and wear resistance of the paint coatings, reduces opaqueness and oil absorption.

9 cl, 3 tbl, 3 ex

Description

The invention relates to the production of pigments and can be used to obtain pigments and their further application in various industries, in particular in the manufacture of paints and varnishes, building materials, ceramic materials, glasses, enamels, plastics, plastics, rubber and other components of this pigment consist of iron oxide obtained from material of the same class, but with different particle sizes and different structures, which is the most distinguishing feature of the invention.

It is known to use iron oxide of the F ₂ O _{3 system} as iron oxide pigments. These pigments are used for coloring plastics, linoleum, used in the manufacture of building materials, various paints, enamels, etc.

Known pigment (Patent SU No. 1033517, class C09D 1/24. Application. 1981.04.29 application No. 3291750 / 23-26. Publ. 1983.08.07). This pigment contains the following components, wt.%: Iron oxide 63.0-88.0; silica 0.7-6.0; alumina 0.6-5.1; calcium oxide 1.7-3.0; magnesium oxide 3.8-4.0; oxides of sodium and potassium 2.3-4.0; manganese oxide 0.4-0.9; zinc oxide 2.5-14.0.

However, this pigment has a narrow color gamut, requires the presence of a large number of components, from various substances, have a narrow scope.

A known composition for producing red iron-zinc pigment (Patent SU No. 1656857, class C09C 1/22. Application. 1989.09.25 application No. 4759635/26. Publ. 1994.09.15). This pigment contains the following components, wt.%: Iron oxide 60.0-98.0; zinc oxide 1.0-15.0; alumina 0.1-25.0.

However, this pigment has only one color, it requires various substances.

Known pigment based on silica and iron oxide of the F ₂ O _{3 system} (Patent RU No. 2218371, class C09C 1/24, C09C 1/28, C09C 3/06. Application. 1999.03.10 application No. 2001127434/15. Publ. 2003.12. 10). This pigment consists of silica and iron oxide in the following ratio of components, wt.%:

Silica 70-98 Iron oxide 2-30

However, this pigment has a narrow color range. In addition, it requires difficult to obtain raw materials - silica.

Closest to the proposed invention is a brown iron oxide pigment based on iron oxides (II) and (III) (Patent SU No. 1154300, class C09C 1/24. Application. 1983.04.25, application No. 3583369 / 23-26. Publ. 1985.05. 07). This pigment consists of aluminum oxide, magnesium oxide, calcium oxide, iron oxides in the following ratio of components, wt.%:

alumina 31.10-36.90 magnesium oxide 0.26-0.30 calcium oxide 0.09-0.11 iron oxides rest

However, this pigment is intended to produce only one color, has a high oil absorption, and requires components consisting of various substances to obtain it.

The technical result of the present invention is:

- in expanding the field of application of cheap iron oxide pigments;

- in obtaining pigment from one substance;

- in obtaining a pigment in which the second component can be obtained from the first component by mechanical grinding;

- in increasing the color range of the pigment from gray with a metallic sheen to red;

- in obtaining a pigment that performs different functions: anticorrosive, protective and decorative, filler functions;

The present invention relates to a pigment based on iron oxide (III), comprising iron oxide (III), containing two fractions, the first fraction of iron oxide (III) having a lamellar structure with a particle size of at least 20 μm, the second fraction of iron oxide (III) has any structure with a particle size of not more than 20 microns in the following ratio of components, wt.%:

iron oxide (III) of the first fraction lamellar structure 3-97 iron oxide of the second fraction (III) from particles of various shapes 97-3

The present invention relates to the aforementioned iron (III) oxide pigment, where iron (III) oxide can be made from natural iron (III) oxide by mechanical preparation or artificial iron (III) oxide. The present invention also relates to the aforementioned pigment based on iron oxide (III), where specularite can be used as iron oxide (III).

The present invention also relates to the aforementioned iron (III) oxide-based pigment, where the Rudny Log deposit can be used as iron oxide (III).

The present invention also relates to the aforementioned iron (III) oxide pigment, where the first fraction of iron (III) oxide can be used as the second fraction of iron oxide (III), mechanically ground to the size of the second fraction.

The present invention also relates to the aforementioned pigment based on iron oxide (III), which may further comprise a coloring pigment in an amount of 0.5-5.0 wt.%. The present invention also relates to the aforementioned iron (III) oxide pigment, where the iron (III) oxide may contain a particle size of the first fraction of iron (III) oxide, preferably not more than 100 μm, more preferably 40-70 μm, with a mass ratio of the first fraction to the second fractions (1.5-3): 1. With this ratio of parameters, the pigment has the best anti-corrosion properties.

The present invention also relates to the aforementioned iron (III) oxide pigment, where the iron (III) oxide may contain a particle size of the first fraction of iron (III) oxide of at least 100 μm, preferably at least 150 μm, more preferably at least 200 μm, with a mass ratio of the first fraction to the second fraction (10-30): 1. With this ratio of parameters, the pigment has the best protective and decorative properties.

The present invention also relates to the use of the above pigment based on iron oxide (III) individually or in a mixture with other materials as a component in the compositions of paints and varnishes, ceramic materials, enamels, glasses, cements, plastics, building materials, rubber, printing inks and / either individually or in a mixture with other materials for finishing painted surfaces, surfaces of ceramic materials, enamels, glasses, metals, cements, plastics, building materials, rubber, printing fskih paints.

The particles of iron oxide (III) of the second fraction can have any structure, i.e. the particle structure of the second fraction is not critical to obtain the above technical result.

The finished pigment based on iron oxide (III) is available in two versions:

- in the form of a single component consisting of mixed first and second fractions of iron oxide (III);

- in the form of two component compositions containing, respectively, the first and second fractions of iron oxide (III).

The supply of pigment in two versions is determined by the requirements for the final product and the technology for its production. So, for example, if in the technological process there is an operation of fine grinding of components, which can violate the lamellar structure of the first fraction of iron oxide (III), which is necessary, for example, for protective and decorative materials, then you should choose the second option for the supply of pigment. In this case, the component of the second fraction of iron oxide (III) will be introduced before the grinding operation, and the component of the first fraction of iron oxide (III) will be introduced after the grinding operation, i.e. at the end of the process.

To improve the properties of the pigment based on iron oxide (III), the first and / or second fraction of iron oxide (III) can be treated, for example, with surface-active substances (surfactants).

The first fraction of iron oxide (III) lamellar structure has a gray color with a metallic luster. The second fraction of iron oxide (III) is a red powder, consisting of particles of various shapes.

To expand the color gamut and change the color of the pigment based on iron oxide (III) in the first and / or second fraction of iron oxide (III) coloring pigments can be added in a small amount, for example, metal powder pigments (bronze powder, aluminum powder (silver "Powder), an alloy of copper with zinc and tin (" golden "powder) and others), organic dyes and inorganic pigments.

The resulting pigment may have a color scheme from gray with a metallic sheen to red.

The specified pigment is distinguished by the possibility of obtaining from the material of one class of different fineness and structure, which provides a variety of colors and a wide range of applications. In addition, if there is only one large first fraction of iron (III) oxide, it is possible to grind the second fraction and create the claimed pigment. The claimed pigment has an oil absorption lower than in the prototype, which makes the coating based on it more durable and more saturated.

To prepare the pigment based on iron (III) oxide, a natural or artificially produced iron (III) oxide or salts and / or iron complexes that can be oxidized and / or decomposed during the firing process are used as a source of iron (III) oxide in order to obtain iron oxide (III). In addition, as a source of iron oxide (III) can be used, for example, natural or artificial iron mica, which is subjected to mechanical grinding to obtain the desired size. As iron mica, obtained from natural specularity, mica of one of the grades of specularite or a mixture of them can be used:

- a) Miox brands of Kärntner Montanindustrie (Austria), containing Fe ₂ O ₃ 85-94%, Al ₂ O ₃ - 2-3%, MgO - 1-2%, Ca - 0.3%, SiO ₂ - 3 -6%, Pb <0.1%;

b) Nubifer brand of the company "Nubiola" (Spain), containing Fe ₂ O ₃ 89 - 94%, Al ₂ O ₃ - 1.9%, MgO - 0.1%, Ca - 0.4%, SiO ₂ - 4 , 2%, K ₂ O 0.2%.

c) the Altai deposit "Rudny Log" with the content of oxides of silicon, aluminum, magnesium and calcium, respectively, no more than 2.5 - 32.5; 1.8; 0.2; and 0.3%.

Example 1. Iron oxide (III) of the first fraction with a particle size of 40 μm 3 wt.% From the Nubifer brand specular, oxide of iron (III) of the second fraction with a particle size of 10 μm 97% by weight from the specularite of the Rudny Log deposit.

Example 2. Iron oxide (III) of the first fraction with a particle size of 65 μm 50 wt.% From the specularite deposits "Rudny Log", iron oxide (III) of the second fraction with a particle size of 5 μm 50% wt.% From specularite brand Miox.

Example 3. Iron oxide (III) of the first fraction with a particle size of 200 μm 97 wt.% From the specularite deposits "Rudny Log", iron oxide (III) of the second fraction with a particle size of 15 microns 3% wt.% Brand Nubifer.

The test results for hiding power, oil absorption and color are shown in table 1.

By hiding power, one can judge the coloring ability of the obtained pigments.

Oil absorption characterizes the ability of a pigment to absorb oil. The lower the pigment's oil absorption, the more resistant and durable the coatings are. Comparative results show the advantages of the proposed pigment in comparison with the known prototype in terms of oil absorption and hiding power.

Table 1. Example 1 Example 2 Example 3 Prototype No. 1154300 Spreading rate, g / m ² 4,5-5,1 8.3-9.1 16.5-17.9 13.0-20.3 Oil absorption, g / 100 g of pigment 16-17 11-11.5 16.5-17.0 40.0-45.0 Color Red Gray red with a metallic sheen Gray with a metallic sheen Brown

The protective properties of the proposed pigment were evaluated based on comparative tests of primers GF-021 with a standard formulation (option 1) and using the proposed pigment of the following parameters: iron oxide (III) of the first fraction with a particle size of 40 μm 3 wt.%, Iron oxide (III) the second fraction with a particle size of 10 μm 97% wt.% (option 2). The test results are shown in table 2.

table 2 Name of indicator Option 1 Option 2 The hardness of the film is according to the pendulum device M-3, conv. units 0.347 0,500 The resistance of the film to the effects of salt fog, h, at least 120 240 Abrasion resistance of quartz sand (kg / μm) 0.608 0.769

The anticorrosion properties were evaluated by the effect of salt fog on the paint coating, which included the well-known iron oxide pigment according to TU2322-166-05011907-88 and the proposed pigment.

Table 3 presents the test results of paints based on alkyd resin brand AF-033 TU 2311-025-54651722-2002, in the formulation of which as a pigment was used:

- iron oxide pigment TU 2322-166-05011907-88 (option a)

- iron (III) oxide of the first fraction from the specularite of the Rudny Log deposit with an average particle size of 70 μm, iron (III) oxide of the second fraction from the specularization of the Rudny Log deposit with an average particle size of 15 μm at a ratio of 2.2: 1 ( option b);

- iron oxide (III) of the first fraction from the Nubifer brand speculator with an average particle size of 63 microns, iron oxide (III) of the second fraction from the specularite of the Rudny Log deposit with a particle size of 10 microns at a ratio of 1.5: 1 (option c).

Table 3 Parameter Name Option a) Option b) Option c) The resistance of the film to the effects of salt fog, h, at least 120 600 600 Resistance to abrasion by abrasive sandpaper (specific weight wear), g / m ² 15.8 11,2 10.8

From the above comparative characteristics it is seen that the values of the painting and technical characteristics of the claimed pigment: oil absorption and hiding power is better compared to the prototype. In addition, a paint containing the claimed pigment has a higher corrosion resistance and abrasion resistance than a paint containing a known iron oxide pigment according to TU 2322-166-05011907-88.

Thus, the test results show that the proposed pigments provide effective protection of the surfaces against abrasion, and reliable corrosion protection of metal surfaces and surpass the prototype in oil absorption, opacity and color spectrum.

The pigment based on iron (III) oxide can be used as an anti-corrosion pigment, a protective and decorative pigment, used as a filler, as well as various materials, such as paints, ceramics, building materials, as part of enamels, glasses, cements, plastics, rubber, printing paints and for surface finishing of ceramic materials, enamels, glasses, cements, plastics, building materials, rubber, printing inks.

The pigment based on iron oxide (III) can be used in powder paints, water-dispersible and organosoluble primers, paints, enamels. Acrylic, vinyl, organosilicon and epoxy resins, alkyd, unsaturated polyester, melamine polymers, cellulose polymers, fluorine-containing polymers, polyamides, polyurethanes, polyacrylates, amines, polyphenols, etc. can be used as binders in paints and varnishes. These substances can be used both independently and in combination.

The claimed pigment can be mixed with the above binders in ratios from 1: 1.2 to 1: 3.5.

As additives in paint and varnish compositions, together with the declared pigment, means for regulating viscosity, flowability, sedimentation, structure formation promoters, defoaming agents, plasticizers, antiseptics, antifungicides, UV stabilizers, fillers, etc. can be introduced.

The claimed pigment can be used in paints and varnishes as a filler according to claim 1 of the claims. The content of the claimed filler in the total amount of filler in the paintwork materials can range from 100% to 0.5%.

In an appropriate amount, the proposed pigment can be used in printing inks for various types of printing: high, deep flat, lithographic printing, offset printing, digital, engraving, etc.

The proposed pigment can be used in the production of polymeric materials both by direct mixing with the polymer, and after their preliminary granulation. As a plastic component, thermoplastic polymers can be used.

The proposed pigment can be used in the production of building materials, for example concrete, cement, paving slabs, cement tiles, polymer-sand tiles, etc. Colored building materials can be obtained by directly mixing them in a solution or painting their surface after hardening.

The proposed pigment can be used for coloring ceramics, metal and glass. Dyeing can be carried out both by adding pigment directly to the raw material, and by surface dyeing of the product.

The claimed pigment gives the product improved mechanical strength, chemical resistance, provides good adhesion to the substrate, resistance to light, chalking, washing.

Claims (9)

1. The pigment based on iron oxide, comprising iron oxide (III), characterized in that it contains two fractions of iron oxide (III), while the first fraction of iron oxide (III) has a lamellar structure with a particle size of at least 20 microns, the second the fraction of iron oxide (III) consists of particles of various shapes with a particle size of not more than 20 microns in the following ratio of components, wt.%:
iron oxide (III) of the first fraction lamellar structure 3-97 iron oxide (III) of the second fraction from particles of various shapes 97-3 2. The pigment based on iron oxide according to claim 1, characterized in that the iron oxide (III) is made of natural iron oxide (III) by mechanical preparation or iron oxide (III) of artificial origin. 3. The pigment based on iron oxide according to claim 1, characterized in that specularite is used as iron oxide (III). 4. The pigment based on iron oxide according to claim 1, characterized in that the specimen of the Rudny Log deposit is used as iron (III) oxide. 5. The pigment based on iron oxide according to claim 1, characterized in that the first fraction is used as the second fraction, mechanically ground to the size of the second fraction. 6. The pigment based on iron oxide according to claim 1, in which the first fraction of iron oxide (III) preferably contains a particle size of not more than 100 μm, more preferably 40-70 μm, with a mass ratio of iron oxide (III) of the first fraction to iron oxide (III) the second fraction, wt.% (1.5-3): 1. 7. The pigment based on iron oxide according to claim 1, in which the first fraction of iron oxide (III) contains a particle size of not less than 100 microns, preferably not less than 150 microns, more preferably not less than 200 microns, with a ratio of iron oxide (III) of the first fraction to iron oxide of the second fraction (III) (10-30): 1. 8. The pigment based on iron oxide according to claim 1, characterized in that it further comprises a coloring pigment in an amount of 0.5-5.0 wt.%. 9. The use of pigment based on iron oxide according to any one of claims 1 to 7 individually or mixed with other materials as a component in the compositions of paints and varnishes, ceramic materials, enamels, glasses, cements, plastics, building materials, rubber, printing inks , and / or separately, or in a mixture with other materials for finishing painted surfaces, surfaces of ceramic materials, enamels, glasses, metals, cements, plastics, building materials, rubber, printing inks.