CN111662598A - Water-based paint and preparation and application thereof - Google Patents
Water-based paint and preparation and application thereof Download PDFInfo
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- CN111662598A CN111662598A CN201910177269.XA CN201910177269A CN111662598A CN 111662598 A CN111662598 A CN 111662598A CN 201910177269 A CN201910177269 A CN 201910177269A CN 111662598 A CN111662598 A CN 111662598A
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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
- C09D125/00—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 an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
Abstract
The invention relates to a water-based paint and preparation and application thereof. Specifically, the invention discloses a coating composition containing modified titanium dioxide. The coating composition has the characteristics of keeping the performance of the coating, reducing the consumption of the traditional titanium dioxide raw material, saving the raw material, reducing the production cost and the like.
Description
Technical Field
The invention relates to the field of materials, in particular to a water-based paint and preparation and application thereof.
Background
Along with the rapid development and construction of society and the continuous improvement of living standard of people in recent years, the dosage of the coating is rapidly increased year by year, and products with excellent performance and reasonable price are more and more favored and advocated by markets and consumers. However, because the production of part of the raw materials in part of the coating is greatly damaged to the environment (for example, titanium dioxide has a large demand for mineral products, the surface shape and structure are damaged in the production of titanium dioxide, and the environment is damaged by the process), the national requirements and the attention on environmental protection are continuously improved, and the price of the raw materials is stimulated to be continuously improved (in recent years, the price of titanium dioxide rises rapidly). The pigment is one of four main components of the latex paint and is an indispensable part of the latex paint. The pigment which is most commonly used in the emulsion paint is titanium dioxide. Therefore, the price of the titanium dioxide is increased, great pressure is brought to the cost of the paint, and in order to meet the market demand, certain optimization is needed to be carried out on the cost of the product.
The traditional energy-saving emission-reducing method achieves the effects of reducing cost, saving energy and reducing emission by singly reducing the consumption of raw materials in a production formula, but the product performance is continuously sacrificed, so that the final sacrifice is the rights and interests of consumers, and the original starting point of energy conservation and emission reduction is not met.
Therefore, there is an urgent need in the art to develop a novel coating composition with less raw material consumption and better performance to meet the market demand.
Disclosure of Invention
The invention aims to provide a coating composition with saving raw materials and better performance, and a preparation method and application thereof.
In a first aspect of the present invention, there is provided a coating composition comprising a pigment, the pigment comprising a modified titanium dioxide having the following characteristics: the modified titanium dioxide has a core-shell structure and comprises a core material and a coating layer coated on the surface of the core material.
In another preferred embodiment, the coating composition further comprises the following components: film forming matter, filler, assistant and water.
In another preferred embodiment, the film-forming material is selected from the group consisting of: acrylic emulsion, styrene-acrylic emulsion, vinyl acetate-acrylic emulsion, VAE emulsion, vinyl acetate-tertiary emulsion, silicone-acrylic emulsion, or a combination thereof.
In another preferred embodiment, the filler is selected from the group consisting of: calcium carbonate, kaolin, diatomite, wollastonite, silica, mica powder, talcum powder, superfine barium sulfate, silicon dioxide or a combination thereof.
In another preferred embodiment, the auxiliary is selected from the group consisting of: a dispersant, a wetting agent, a thickener, a coalescent, a co-solvent, a defoamer, a pH adjuster, a mildewcide, a preservative, an antifreeze, or a combination thereof.
In another preferred embodiment, the filler comprises a first filler and a second filler, and the particle size of the first filler is 1 μm to 5 μm, the particle size of the second filler is 10 μm to 30 μm, and the weight ratio of the first filler to the second filler is 0.3 to 0.8 (preferably 0.4 to 0.7, more preferably 0.5 to 0.65).
In another preferred embodiment, the particle size of the first filler is 2 μm to 4 μm, preferably 2 μm to 3 μm.
In another preferred embodiment, the particle size of the second filler is 15 μm to 25 μm.
In another preferred embodiment, the first filler is kaolin.
In another preferred embodiment, the second filler is calcium carbonate.
In another preferred embodiment, in the coating composition, the pigment further comprises traditional titanium dioxide, and the weight ratio of the modified titanium dioxide to the traditional titanium dioxide is 0.05-0.4, preferably 0.1-0.39.
In another preferred embodiment, the traditional titanium dioxide is TiO2Preferably from the group: rutile type TiO2Anatase type TiO2Or a combination thereof.
In another preferred example, the shape of the traditional titanium dioxide is similar to a sphere.
In another preferred embodiment, the particle size of the conventional titanium dioxide is 0.1 μm to 1 μm, preferably 0.15 μm to 0.8 μm, and more preferably 0.2 μm to 0.5 μm.
In another preferred embodiment, the coating composition has one or more characteristics selected from the group consisting of:
1) the core material is a material selected from the group consisting of: calcium carbonate, talc, kaolin, wollastonite, silica, or a combination thereof;
2) the coating layer is made of a material selected from the group consisting of: TiO22、ZnO、ZnS、SbO3；
3) The shape of the core material is selected from the group consisting of: spindle-shaped, spherical and small cubic;
4) the average particle size of the core material is 0.5-1.5 μm;
5) the thickness of the coating layer is 0.1-0.5 μm;
6) the average grain diameter of the modified titanium dioxide is 0.8-2.5 microns, preferably 1-2 microns.
In another preferred embodiment, the core material is in the shape of a spindle.
In another preferred embodiment, the coating composition comprises:
10-35 parts by weight of a film-forming substance;
20-50 parts by weight of a filler;
5-9.5 parts by weight of traditional titanium dioxide;
0.5-5 parts by weight of modified titanium dioxide;
1-15 parts of an auxiliary agent;
10-60 parts by weight of water.
In another preferred embodiment, the mass content of the film-forming material in the coating composition is 10 to 35 wt%, preferably 11 to 30 wt%, and more preferably 12 to 25 wt%.
In another preferred embodiment, in the coating composition, the mass content of the modified titanium dioxide is 0.5 to 8 wt%, preferably 1 to 7 wt%, and more preferably 2 to 6 wt%.
In another preferred embodiment, the weight ratio of the modified titanium dioxide to the traditional titanium dioxide is selected from the following group: 0.05, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4.
In a second aspect of the present invention, there is provided a method of preparing a coating composition comprising the steps of:
1) providing a film forming material, a filler, a pigment, an auxiliary agent and water, wherein the pigment comprises modified titanium dioxide;
2) the above materials were mixed with stirring to obtain the coating composition.
In a third aspect of the present invention, there is provided a coating method comprising the steps of:
1) there is provided a coating composition according to the first aspect of the invention,
2) the coating composition is applied to a substrate.
In a fourth aspect of the present invention, there is provided a coating obtained by applying the coating composition of the first aspect of the present invention to a substrate.
In another preferred embodiment, the substrate is selected from the group consisting of: wall, putty board, no asbestos fibreboard, PLASTIC LAMINATED.
It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.
Detailed Description
The inventors of the present invention have conducted extensive and intensive studies for a long time to obtain a coating composition having a reduced raw material consumption and improved properties by adjusting the composition of pigments contained in the coating composition and the formulation of the coating composition and optimizing the preparation process. On this basis, the inventors have completed the present invention.
Term(s) for
As used herein, the terms "aqueous polymeric material", "coating composition", "paint", "latex paint" or "paint" are used interchangeably.
As used herein, the terms "coating", "paint film" or "paint layer" are used interchangeably.
As used herein, the terms "commercial titanium dioxide," "traditional titanium dioxide," or "traditional pigment" are used interchangeably.
As used herein, the term "comprising" means that the various ingredients can be applied together in a mixture or composition of the invention. Thus, the terms "consisting essentially of and" consisting of are encompassed by the term "comprising.
Modified titanium white powder
As used herein, the term "modified titanium dioxide" has the following characteristics: the core-shell structure comprises a core material and a coating material, wherein the coating material is coated on the whole outer surface of the core material basically and uniformly; wherein the shape of the core material is selected from the group consisting of: spindle-shaped, spherical and small cubic; the core material has an average particle size of about 0.5 to about 1.5 mum (preferably 0.6-1.2 μm); the core material is a material selected from the group consisting of: calcium carbonate, talc, kaolin, wollastonite, silica, or a combination thereof; the thickness of the coating layer formed by the coating layer material is 0.1-0.5 μm (preferably 0.15-0.45 μm, more preferably 0.16-0.42 μm); the coating material is selected from the following group: TiO22、ZnO、ZnS、SbO3。
Further, the coating rate of the coating layer material in the modified titanium dioxide to the core material is more than or equal to 95% (preferably more than or equal to 96%, more preferably more than or equal to 98%, most preferably more than or equal to 99%, such as 100%); the whiteness of the modified titanium dioxide is more than or equal to 90 (preferably more than or equal to 95, and more preferably more than or equal to 98); the pH value of the aqueous suspension of the modified titanium dioxide is 7-10 (preferably 7.5-10, more preferably 7.8-10); the oil absorption of the modified titanium dioxide is 30-50g/100 g; the D50 particle size of the modified titanium dioxide is 1.7-2 μm; the specific surface area of the modified titanium dioxide is 4-5m2(ii)/g; the scattering power of the modified titanium dioxide is 100-120.
Typically, the present invention employs the following modified titanium dioxide 1 (abbreviated as "Tiancheng powder") of a Tiancheng nano material to prepare the coating composition. The natural powder is prepared from titanium dioxide (TiO)2) The white pigment chemically prepared from inorganic synthetic material (such as calcium carbonate) is a new functional green material developed and produced by biomimetic mineralization patent technology. The natural powder is a composite material, and is prepared by coating the optimized conventional titanium dioxide on calcium carbonate inner core (particle diameter of 0.6-1.2 μm) with special structure (such as spindle shape) by specific process (such as depolymerization of the optimized titanium dioxide into nanometer TiO2, and inorganic coating treatment of the product) by inorganic synthesis technology2The coating rate of the titanium dioxide reaches more than 95 percent, and the modified titanium dioxide with a stable and firm spindle-shaped structure is formed. The traditional titanium dioxide is the optimized 200-300nm rutile type titanium dioxide, and the mass fraction of the titanium dioxide is more than or equal to 16 percent. The modified titanium dioxide has the performances of whiteness, scattering power, oil absorption, PH value and the like which are equivalent to those of commercial titanium dioxide; meanwhile, the composition has the characteristics of stable chemical property, no toxicity, no odor, environmental protection and the like.
The technical indexes of the Tiancheng powder TC806, TC103S and TC799 are as follows:
TABLE 1
Coating composition
The coating compositions of the present invention have a PVC (i.e., pigment volume concentration means the volume of pigment and filler in the coating composition as a percentage of the total volume of the coating composition) of between 40% and 80%. The paint mainly comprises the following components in parts by weight: 10% -35% of film forming substances; 30 to 50 percent of filler, 10 to 30 percent of heavy calcium carbonate, 5 to 15 percent of kaolin and the like as main components; the pigment is composed of 5-25% of traditional rutile titanium dioxide and 1-10% of modified titanium dioxide, the particle size D50 of the modified titanium dioxide is 1.800-1.950 microns, and the specific surface area is 4.00-5.00 square meters per gram. The modified titanium dioxide can be effectively filled in gaps of large-particle fillers, and the compactness and the flatness of a paint film are increased, so that the purpose of improving the covering is achieved. In the latex paint, on the premise of keeping the performance of the paint, the addition of the modified titanium dioxide after the formula and the process of the paint are adjusted can properly reduce the pigment dosage in the formula in the preparation process of the paint, thereby realizing the purposes of optimizing the product performance and saving the cost.
Typically, the invention discloses a water-based paint, which comprises the following components:
30-50 parts by weight of a filler,
10-35 parts by weight of a film-forming substance,
5 to 25 parts by weight of the traditional titanium dioxide,
1 to 10 parts by weight of modified titanium dioxide,
0.1 to 1 part by weight of a dispersant,
0.1 to 1 weight portion of wetting agent,
0.01-3 parts by weight of a thickener;
0.01-5 parts by weight of a pH regulator.
Preferably, the coating further comprises one or more adjuvants selected from the group consisting of;
0-5 parts by weight of an anti-freezing agent;
0-4 parts by weight of a film-forming aid;
0.1-5 parts by weight of a defoaming agent;
0-4 parts by weight of a mildew preventive; and
0-4 parts by weight of preservative.
More typically, the coating composition comprises:
10-35 parts by weight of a film-forming material selected from the group consisting of: styrene-acrylic emulsion, vinyl acetate-acrylic emulsion, VAE emulsion, vinyl acetate-acrylic emulsion, silicone-acrylic emulsion, or a combination thereof; in one embodiment, a styrene-acrylic emulsion is selected;
30-50 parts of a filler, wherein the filler is selected from the following group: calcium carbonate, talcum powder, kaolin, wollastonite, silicon dioxide or a combination thereof, wherein the kaolin comprises 5-15 wt% and the particle size D50 is 2-3 microns; 10-30% of calcium carbonate by weight, and 15-25 microns of particle size D50. The particle size of the filler is far larger than the particle size D50 of the modified titanium dioxide.
The weight component of the traditional titanium dioxide is 5-25%, in a specific embodiment, the optimized rutile type titanium dioxide is used;
1-10 parts of modified titanium dioxide, wherein the modified titanium dioxide is a composite material, and the optimized traditional titanium dioxide is wrapped on a calcium carbonate core with a special structure through a specific process and TiO by an inorganic synthesis technology2The coating rate of the titanium dioxide reaches more than 96 percent, and the modified titanium dioxide with a stable and firm spindle-shaped structure is formed. Has the characteristics of stable chemical property, environmental protection, no toxicity, no harm and the like; meanwhile, the titanium white powder has the performances of whiteness, scattering power, oil absorption, PH value and the like which are equivalent to those of the commercial titanium white powder.
The coating composition further comprises the following components:
0.1-1 part by weight of a dispersant selected from the group consisting of: a polycarboxylate, sulfate salt, sulfonate, or a combination thereof. In one embodiment, the dispersant is preferably a sodium salt of a polycarboxylic acid.
0.1-1 part by weight of wetting agent, wherein the wetting agent is selected from the following group: a nonionic polymer alkyl ether, a nonionic polymer alkyl ester, a nonionic polymer alkyl alcohol, or a combination thereof. In one embodiment, the wetting agent is preferably a nonionic high molecular alkyl ether.
0.01-3 parts by weight of a thickener selected from the group consisting of: cellulosics, polyurethanes, alkali swelling, or combinations thereof. In one embodiment, a cellulosic thickener is selected.
0.01-5 parts by weight of a pH adjusting agent selected from the group consisting of: organic alcamines, ammonia, sodium hydroxide, or combinations thereof. In a particular embodiment, the pH adjusting agent is selected from organic alcamines.
0-5 parts by weight of an antifreeze agent selected from the group consisting of: propylene glycol, ethylene glycol, glycerol, or combinations thereof.
0-4 parts by weight of a film-forming aid selected from the group consisting of: alcohol esters, ethers, or combinations thereof.
0.1-5 parts by weight of a defoamer selected from the group consisting of: silicone based defoamers, mineral oil based defoamers, or combinations thereof.
0-4 parts by weight of a mildew preventive; and
0-4 parts by weight of preservative.
And an acceptable amount of water.
When the modified titanium dioxide and the traditional titanium dioxide are used together, the covering power and the whiteness of the traditional titanium dioxide can be kept, the characteristics of weather resistance and the like of the traditional titanium dioxide are not influenced, and the color defect of the traditional titanium dioxide can be overcome.
Preparation method
Typically, the preparation method of the present invention comprises the steps of:
1) providing the following components:
30-50 parts by weight of filler, wherein the kaolin component of the filler is 5-15%;
10 to 35 parts by weight of a film-forming substance,
5 to 25 parts by weight of traditional titanium dioxide,
1 to 10 parts by weight of modified titanium dioxide,
0.1 to 1 part by weight of a dispersant,
0.1 to 1 part by weight of a wetting agent,
0.01-3 parts by weight of a thickener;
0.01-5 parts by weight of a pH regulator;
0-5 parts by weight of an anti-freezing agent;
0-4 parts by weight of a film-forming aid;
0.1-5 parts by weight of a defoaming agent;
0-4 parts by weight of a mildew preventive; and
0-4 parts by weight of preservative.
2) Dispersing the components provided in step 1) in an acceptable amount of water to obtain the coating composition.
More specifically, the method comprises the steps of:
a) putting water into a dispersion tank, and controlling the rotating speed to be 300-500 revolutions per minute;
b) then adding a wetting agent, a dispersing agent, a thickening agent and a pH regulator into the dispersion tank, and stirring for 3 +/-1 minutes;
c) adding the filler, the traditional titanium dioxide and the modified titanium dioxide into a dispersion tank in sequence, increasing the rotating speed to 1000-1800 rpm, and dispersing at high speed for 15 +/-3 minutes;
d) after high-speed dispersion, reducing the rotating speed to 600-800 revolutions per minute, and sequentially adding optional film formers, film forming additives, antifreezing agents, mildew proofing agents and other additives;
e) finally, water is added to adjust the viscosity to the desired viscosity, and the coating composition is obtained.
Coating layer
In the coating prepared by adopting the coating composition, the modified titanium dioxide can be effectively filled in the coating gap by virtue of the special structure of the modified titanium dioxide, and the weight components of the traditional pigment in the formula can be effectively reduced under the condition of keeping the performance of the coating unchanged, so that the aims of energy conservation and emission reduction can be effectively fulfilled. The obtained coating can also keep the characteristics of the traditional titanium dioxide such as whiteness, covering power, weather resistance, water resistance, alkali resistance, water permeability and the like.
Compared with the prior art, the invention has the following main advantages:
(1) compared with a coating composition only using the traditional titanium dioxide as a pigment, the invention prefers the combination of the natural powder TC806 and the traditional titanium dioxide, and the water-based coating has whiteness which is whiter than that of the original formula;
(2) compared with a coating composition only using traditional titanium dioxide as pigment, the coating composition preferably selects the combination of natural powder TC806 and traditional titanium dioxide, and because the natural powder is in a special bionic spindle particle type, a net-shaped supporting structure is formed on the surface of a paint film, so that the scrubbing resistance of the paint film is obviously improved;
(3) compared with a coating composition only using traditional titanium dioxide as a pigment, the coating composition preferably selects the combination of the natural powder TC806 and the traditional titanium dioxide, has the advantages of small bulk density, easy dispersion, difficult agglomeration and the like, and shows stronger covering power under the dry film state of an optimal formula (the proportion of R996 to TC806 is 8.0: 2.5);
(4) compared with a coating composition only using traditional titanium dioxide as pigment, the coating composition preferably selects the combination of natural powder TC806 and traditional titanium dioxide, has regular granular shape of natural powder, is obviously and durably suspended than the traditional titanium dioxide, can improve the suspension stability of the coating in a long-time storage state, effectively prevents fluid from settling, and has better storage stability;
(5) the invention uses the optimized formula of the natural powder TC806 and the traditional titanium dioxide R996, not only can maintain or improve the main performance of the original formula, but also obviously reduces the usage amount of high-cost raw materials (such as titanium dioxide and emulsion); has the advantages of raw material saving, low cost and the like;
(6) the coating composition disclosed by the invention is simple in preparation process, can be realized by only adjusting the components of the pigment and the formula amount of each component of the coating, and can be produced in batches on the basis of the existing production equipment.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers. Unless otherwise indicated, percentages and parts are by weight.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
Raw materials
The raw materials used in the examples are shown in table 2 below:
TABLE 2
Universal test method and related standards
The performance test of the obtained coating composition is carried out based on the national standard GB/T9756-2009.
The performance of the obtained coating meets the GB 18582-2008 and HJ-T201-.
Preparation of the coating composition
Firstly, putting water into a dispersion tank, and controlling the rotating speed to be 300-500 revolutions per minute; then adding a wetting agent, a dispersing agent, a thickening agent and a pH regulator into the dispersion tank, and stirring for 3 +/-1 minutes; adding the pigment filler and the modified titanium dioxide into a dispersion tank in sequence, increasing the rotating speed to 1000-1800 rpm, and dispersing at high speed for 15 +/-3 minutes; after high-speed dispersion, reducing the rotating speed to 600-800 revolutions per minute, and sequentially adding optional film forming substances, film forming additives, antifreezing agents, mildew proofing agents and other additives; finally, water is added to adjust the viscosity to the desired viscosity, and the coating composition is obtained.
The amounts of the respective components used in examples 1 to 3 and comparative examples 1 to 6 are shown in Table 3.
TABLE 3
Remarking: the unit of each amount in table 3 is parts by weight.
Preparation of the coating
The coating is formed by coating the coating composition or the coating on a substrate and naturally drying. The coating comprises a substrate including (but not limited to): wall, putty board, no asbestos fibreboard, PLASTIC LAMINATED. The substrate surface is planarized prior to coating. The construction method of the coating comprises the following steps:
1) optionally diluting said coating composition or said coating to a coating viscosity;
2) coating the diluted coating material on a base material;
3) the coating is naturally dried, so that subsequent tests can be carried out.
Comparison of Performance
The results of the performance tests on the coating compositions 1 to 3 obtained in examples 1 to 3 and the coating compositions C1 to C6 obtained in comparative examples 1 to 6 and the coatings obtained using the aforementioned coating compositions, respectively, are shown in Table 4.
TABLE 4
Table 3 lists 3 examples and 6 comparative examples, and meanwhile, through the performance test results in table 4, it can be shown that the modified titanium dioxide 1 can be successfully applied to our paint through certain formulation and improvement of its process, so as to achieve our goals of energy saving and emission reduction. Comparative example 6 differs from comparative example 1 in that one uses pure conventional titanium dioxide and the other uses pure modified titanium dioxide. The test results in table 4 show that the contrast ratio, scrub resistance, and the like of comparative example 6 are greatly reduced, and at the same time, the viscosity is greatly increased after thermal storage, failing to pass our performance requirements. The pure modified titanium dioxide coated on the inner core can be separated under high shearing force, and the scattering capacity of the modified titanium dioxide to light is different from that of the pure titanium dioxide, so that the problem of abnormal storage of reduced contrast ratio can be caused when the modified titanium dioxide is directly applied.
Examples 1 and 2 are two examples of our successful application by blending with conventional titanium dioxide with some adjustments to the formulation and process. The titanium white light scattering material fully exerts the high scattering power of pure white light and has the high whiteness performance of modified titanium white. Meanwhile, the special structure of the modified titanium white has a considerable effect of improving the compactness of a paint film and improves the scrubbing resistance to a certain extent.
Comparative examples 2 and 3 are modified titanium dioxide using two other types of coatings, respectively. The performance test results in table 4 show that all the modified titanium white materials have poorer performance than the modified titanium white materials currently used by us. Different modified titanium dioxide has different coating types, different core types and different coating processes, and can affect the product system to different degrees. There is a need for continued improvement and testing during the application process.
The difference between the example 2 and the example 1 is that the amount of the modified titanium white is increased again, and the results in table 4 show that the improvement of the product performance is very limited when the proportion of the modified titanium white exceeds a certain range.
The TC806 modified titanium dioxide does not discharge toxic substances to the environment in the production process, the production of pure titanium dioxide brings certain harm, the successful application of the modified titanium dioxide can obviously reduce the yield of pure commercial titanium dioxide, and the cost of 1 ton of the product of the embodiment 1 can be saved by about 500 yuan compared with that of the product of the comparative example 1. The purposes of energy conservation and emission reduction are achieved.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A coating composition, characterized in that the coating composition comprises a pigment, the pigment comprising a modified titanium dioxide having the following characteristics: the modified titanium dioxide has a core-shell structure and comprises a core material and a coating layer coated on the surface of the core material.
2. The coating composition of claim 1, further comprising the following components: film forming matter, filler, assistant and water.
3. The coating composition of claim 2, wherein the filler comprises a first filler and a second filler, and wherein the first filler has a particle size of 1 μ ι η to 5 μ ι η, the second filler has a particle size of 10 μ ι η to 30 μ ι η, and the weight ratio of the first filler to the second filler is 0.3 to 0.8.
4. The coating composition of claim 2, wherein the pigment further comprises conventional titanium dioxide, and the weight ratio of the modified titanium dioxide to the conventional titanium dioxide is 0.05 to 0.4.
5. The coating composition of claim 1, wherein the coating composition has one or more characteristics selected from the group consisting of:
1) the core material is a material selected from the group consisting of: calcium carbonate, talc, kaolin, wollastonite, silica, or a combination thereof;
2) the coating layer is made of a material selected from the group consisting of: TiO22、ZnO、ZnS、SbO3；
3) The shape of the core material is selected from the group consisting of: spindle-shaped, spherical and small cubic;
4) the average particle size of the core material is 0.5-1.5 μm;
5) the thickness of the coating layer is 0.1-0.5 μm;
6) the average grain diameter of the modified titanium dioxide is 0.8-2.5 microns.
6. The coating composition of claim 2, wherein the coating composition comprises:
10-35 parts by weight of a film-forming substance;
20-50 parts by weight of a filler;
5-9.5 parts by weight of traditional titanium dioxide;
0.5-5 parts by weight of modified titanium dioxide;
1-15 parts of an auxiliary agent;
10-60 parts by weight of water.
7. The coating composition of claim 4, wherein the weight ratio of the modified titanium dioxide to the conventional titanium dioxide is selected from the group consisting of: 0.05, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4.
8. A method of preparing the coating composition of claim 2, comprising the steps of:
1) providing a film forming material, a filler, a pigment, an auxiliary agent and water, wherein the pigment comprises modified titanium dioxide;
2) the above materials were mixed with stirring to obtain the coating composition.
9. A coating method, characterized by comprising the steps of:
1) providing a coating composition as defined in claim 1,
2) the coating composition is applied to a substrate.
10. A coating obtained by applying the coating composition according to claim 1 to a substrate.
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