CN112457731A - Water-based ready-mixed paint and preparation method and application thereof - Google Patents
Water-based ready-mixed paint and preparation method and application thereof Download PDFInfo
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- CN112457731A CN112457731A CN202011261102.0A CN202011261102A CN112457731A CN 112457731 A CN112457731 A CN 112457731A CN 202011261102 A CN202011261102 A CN 202011261102A CN 112457731 A CN112457731 A CN 112457731A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of 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
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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
- 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
- C09D7/80—Processes for incorporating ingredients
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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
Abstract
The invention relates to a water-based ready-mixed paint and a preparation method and application thereof, wherein the water-based ready-mixed paint comprises the following components in percentage by mass: 60-75% of water-based acrylic emulsion, 4-10% of titanium dioxide, 0.2-0.4% of sheet lithium magnesium silicate powder, 10-20% of water, 2-8% of color paste and 0.1-10% of auxiliary agent. According to the invention, the flaky lithium magnesium silicate powder with a specific content is added into the water-based ready-mixed paint, so that the water-based ready-mixed paint has higher storage stability, and has the advantages of strong covering power, small color difference, good water resistance, fast surface drying, good leveling property and the like.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a water-based ready-mixed paint and a preparation method and application thereof.
Background
In the civil market, people can select multifunctional water-based ready mixed paint when door frames, windows, old furniture, fire hydrants, pipelines, guardrails and the like need to be coated or renovated. The water-based ready mixed paint has strong adhesive force, good covering power, weather resistance and color retention on multiple base materials, is suitable for multiple base materials (iron, wood and old paint), can be brushed, sprayed and rolled, is convenient to construct, is environment-friendly and odorless as a water-based paint, is friendly to people and environment, and becomes a choice for more people.
When the water-based ready-mixed paint is used on different substrates, the water-based ready-mixed paint needs to be adjusted into different colors, for example, when the water-based ready-mixed paint is used on fire hydrants, red, doors, windows, armrests and the like, the water-based ready-mixed paint can be adjusted into gray, blue, yellow and the like according to the requirements of customers. However, the colored paint with the adjusted color has long storage time, the color paste in the paint is easy to float or sink, and the problems of layering, hard precipitation and the like can be caused seriously, and the problems of color difference, particles, poor covering power and the like of the paint film can be caused in the using process.
CN104530939A discloses a water-based alkyd ready mixed paint, which comprises the following raw materials in parts by weight: 40-50 parts of waterborne alkyd resin, 5-15 parts of pigment, 10-20 parts of filler and 15-30 parts of water. The water-based alkyd ready mixed paint takes water as a diluent, compared with solvent oil as a solvent, the production cost is reduced by about 60%, the safety coefficient of the prepared water-based ready mixed paint product is greatly improved in the processes of production, transportation and use, the discharge of VOC is greatly reduced, the flash point of the product reaches the flash point of a non-dangerous chemical product, the technical index reaches and is higher than the index of national like products, the water-based alkyd ready mixed paint can be used as a special finished paint suitable for priming paint of various oil products, and the water-based alkyd ready mixed paint truly embodies the characteristics of safety, environmental protection and wide application range. However, the aqueous ready mixed paint provided by the application can generate serious delamination and sedimentation after being stored for a long time, and the problems of color difference, particles and poor covering power are generated when the paint is used.
CN111040543A discloses a water-based ready mixed paint with good adhesive force to various types of materials and a preparation method thereof, wherein the water-based ready mixed paint comprises self-drying water-based acrylic emulsion, pigment, barium sulfate, mica powder, a dispersing agent, a defoaming agent, water, an anti-flash rust agent, a pH regulator, a wetting agent, a film-forming assistant and a shaking assistant. Because the self-drying water-based acrylic emulsion is used for replacing the traditional solvent-based alkyd resin, the self-drying property of the water-based acrylic emulsion is utilized without adding a metal drier and a solvent, and the characteristics of reducing smell, reducing VOC and not containing heavy metal are achieved. The self-drying water-based acrylic emulsion has good adhesive force to various materials, and the water-based ready mixed paint has the advantages of low odor, low VOC, no heavy metal and good rust prevention effect by adding the anti-flash rust agent. Similarly, the water-based ready-mixed paint has poor stability, is easy to float or sink after being stored for a long time, and can be seriously layered and hard to precipitate.
Therefore, there is a need in the art to address the problem of improving the stability of aqueous ready-mixed paints, improving the problems of delamination and hard settling.
Disclosure of Invention
One of the purposes of the invention is to provide a water-based ready-mixed paint which has higher storage stability and has the advantages of strong covering power, small color difference, good water resistance, quick surface drying, good leveling property and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a water-based ready-mixed paint which comprises the following components in percentage by mass:
in the water-based ready-mixed paint, the content of the water-based acrylic emulsion is 60-75%, such as 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74% and the like.
In the water-based ready-mixed paint, the content of titanium dioxide is 4-10%, such as 5%, 6%, 7%, 8%, 9% and the like.
In the water-based ready-mixed paint, the content of the sheet lithium magnesium silicate powder is 0.2-0.4%, such as 0.22%, 0.24%, 0.26%, 0.28%, 0.3%, 0.32%, 0.34%, 0.36%, 0.38% and the like,
the water content in the water-based ready-mixed paint is 10-20%, such as 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% and the like.
In the water-based ready-mixed paint, the content of the color paste is 2-8%, such as 3%, 4%, 5%, 6%, 7%, 8% and the like.
In the water-based ready-mixed paint, the content of the auxiliary agent is 0.1-10%, such as 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% and the like.
According to the invention, the flaky lithium magnesium silicate powder is added into the water-based ready mixed paint, and the flaky lithium magnesium silicate powder is soaked in tap water to swell and disperse so as to form the nanogel with high transparency, high viscosity and high thixotropy. The gel has a crystal structure of nano-scale small flakes, and exchangeable cations such as Na are distributed on the surface of the flakes+，Li+When the gel particles are mixed with water, the water is contacted with cations and adsorbed on the surface of the slice to stretch the gel along the slice, and then the protective gel particles rapidly expand until the slice is separated. Because the surface of the slice is negatively charged and the end surface is positively charged, the end surface of the separated slice is attracted to the surface of another slice, thereby forming a three-dimensional card palace structure.
The structure of the card palace has great help to the chemical and physical stability of the coating. For powder with a large specific gravity in the coating, such as toner, titanium dioxide and other fillers in color paste, the powder gradually migrates downwards along with the passage of time due to the influence of the gravity of the powder. The powder in the card uterus can be kept stable and can not float or sink. Meanwhile, the structure is also beneficial to the long-term uniform distribution of the auxiliary agent, the solvent and the emulsion in the coating, so that the storage stability of the coating can be improved by the card palace structure.
In the water-based ready-mixed paint, the addition amount of the sheet lithium magnesium silicate powder needs to be controlled within the range of 0.2-0.4%, the addition amount is insufficient, the stability of the paint is poor, delamination and precipitation are easy to occur after long-term storage, and the leveling property of the paint is poor due to excessively high addition amount.
Preferably, the aqueous acrylic emulsion comprises a self-crosslinking silicone-modified aqueous acrylic emulsion. The water-based acrylic emulsion has the characteristics of good chemical resistance and water resistance, strong adhesive force on multiple base materials, excellent weather resistance and the like.
Preferably, the aqueous acrylic emulsion has a solids content of 46-48%, such as 46.5%, 47%, 47.5%, and the like.
Preferably, the aqueous acrylic emulsion has a viscosity of 200mPa.s, such as 400mPa.s, 600mPa.s, 800mPa.s, 1000mPa.s, 1200mPa.s, 1400mPa.s, 1600mPa.s, 1800mPa.s, 2000mPa.s, 2200mPa.s, 2400mPa.s, 2600mPa.s, 2800mPa.s and the like. Too low a viscosity of the acrylic emulsion results in poor freeze-thaw stability, and too high a viscosity results in poor water resistance.
Preferably, the pH of the aqueous acrylic emulsion is 7 to 9.
Preferably, the glass transition temperature of the aqueous acrylic emulsion is 28 ℃.
Illustratively, the aqueous acrylic emulsion includes a balanced water Neoprene XG-9100.
Preferably, the titanium dioxide comprises rutile type titanium dioxide.
Preferably, the content of titanium dioxide in the titanium dioxide is more than 95%, such as 96%, 97%, 98%, 99% and the like.
Illustratively, the titanium dioxide comprises python R996 and/or dupont R902 +.
Preferably, the sheet lithium magnesium silicate powder is nano-scale sheet lithium magnesium silicate powder. The appearance was white fine powder.
Preferably, the sheet lithium magnesium silicate powder is activated and modified.
Illustratively, the sheet lithium magnesium silicate powder comprises Hamming S-482 and/or BYK RDS,
preferably, the pH of the 2% suspension of the flaky lithium magnesium silicate powder is 7 to 8.
Preferably, the specific surface area of the sheet lithium magnesium silicate powder is less than 340m2g, e.g. 280m2g、290m2g、300m2g、310m2g、320m2g, and the like.
The preferred specific surface area of the invention is less than 340m2The flaky lithium magnesium silicate powder can further improve the leveling property on the premise of ensuring the stability of the water-based ready mixed paint.
Preferably, the color paste comprises an aqueous weather-resistant environment-friendly color paste.
Illustratively, scarlet color pastes include Kedi R2-SK; the medium yellow color paste comprises Kedi Y7-SK; the blue color paste comprises B15-SKA.
Preferably, the auxiliary agent comprises any one or at least two of film forming auxiliary agent, dispersing agent, wetting agent, defoaming agent, flash rust inhibitor, pH regulator, preservative or thickening agent.
Preferably, the coalescing agent comprises an ester solvent and/or an ether solvent. The film forming assistant helps the emulsion to form film and reduce the lowest film forming temperature.
Illustratively, the coalescent includes an ester of a Runtail chemical alcohol-12 and/or DOW DPNB.
Preferably, the dispersant comprises a copolymer solution containing pigment affinic groups.
Illustratively, the dispersant includes BYK190 and/or tego 735W.
Preferably, the wetting agent comprises a siloxane-based wetting agent. The siloxane wetting agent can greatly reduce the surface tension of the coating and can ensure that the coating can be spread evenly.
Illustratively, the wetting agent includes umetone YMT328 and/or tego 4100.
Preferably, the antifoam agent comprises a polyether siloxane type antifoam agent and/or a mineral oil type antifoam agent.
Illustratively, the anti-foaming agent includes BYK024 and/or tego902 w.
Preferably, the anti-flash rust agent comprises a metal organic chelate.
Preferably, the flash rust inhibitor does not contain a metal-organic chelate of sodium nitrite.
Illustratively, the anti-flash rust agent includes Raybo 60 and/or hofmann T730.
Preferably, the pH adjusting agent comprises 2-amino-2-methyl-1-propanol. Illustratively including DOW AMP-95.
Preferably, the preservative comprises an isothiazolinone preservative. Can be used for corrosion prevention in the tank.
Illustratively, the preservatives include ACTICIDE RS and/or MBS.
Preferably, the thickener comprises a nonionic hydrophobically modified polyurethane rheology agent. Exemplary include RM 12W and/or gelatin PUR 44.
Preferably, the coalescing agent is added in an amount of 2-4%, e.g., 2.5%, 3%, 3.5%, etc. The content of the film-forming assistant is too low, so that the lowest film-forming temperature of a paint film is higher than room temperature, the cracking resistance is poor, and the paint film cracks after being dried; too much film-forming assistant content leads to slow surface drying time of the coating film due to high boiling point of the film-forming assistant.
Preferably, the dispersant is added in an amount of 0.8 to 1.5%, such as 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, etc.
Preferably, the wetting agent is added in an amount of 0.1-0.3%, such as 0.15%, 0.2%, 0.25%, etc.
Preferably, the amount of the antifoaming agent added is 0.2 to 0.4%, such as 0.25%, 0.3%, 0.35%, etc.
Preferably, the flash rust inhibitor is added in an amount of 0.2 to 1%, for example, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, etc.
Preferably, the pH adjusting agent is added in an amount of 0.1 to 0.2%, e.g., 0.12%, 0.14%, 0.16%, 0.18%, etc.
Preferably, the preservative is added in an amount of 0.1-0.2%, such as 0.12%, 0.14%, 0.16%, 0.18%, etc.
Preferably, the thickener is added in an amount of 0.5 to 1.5%, such as 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, etc.
Preferably, the water-based ready-mixed paint comprises the following components in percentage by mass:
the second purpose of the invention is to provide a preparation method of the water-based ready-mixed paint, which comprises the following steps: mixing the water-based acrylic emulsion, the titanium dioxide, the flaky lithium magnesium silicate powder, the color paste and the auxiliary agent with water according to the formula ratio, and stirring to obtain the water-based ready-mixed paint.
Preferably, the preparation method comprises the following steps:
(1) mixing the sheet lithium magnesium silicate powder with the formula amount with the first part of water, and dispersing to obtain lithium magnesium silicate powder solution;
(2) starting a dispersion machine, adding the dispersant, the wetting agent, the defoaming agent and the pH regulator into the second part of water according to the formula ratio, and stirring to obtain a first mixed solution; the total amount of the first part of water and the second part of water is the addition amount of water in the water-based ready mixed paint;
(3) adding titanium dioxide into the first mixed solution, increasing the rotating speed of a dispersion machine, and dispersing to obtain a second mixed solution;
(4) reducing the rotating speed of a dispersion machine, adding a film forming aid, a preservative, an anti-flash rust agent and a water-based acrylic emulsion in a formula amount, stirring for the first time, adding the lithium magnesium silicate powder solution and the thickening agent, and stirring for the second time to obtain a third mixed solution;
(5) and adding the color paste with the formula amount into the third mixed solution to obtain the water-based ready-mixed paint.
Preferably, in the step (1), the mass ratio of the sheet-like lithium magnesium silicate powder to the first portion of water is 1 (7-10), such as 1:8, 1:9, etc., preferably 1: 9.
Preferably, in step (1), the dispersing time is 20-30min, such as 21min, 22min, 23min, 24min, 25min, 26min, 278min, 28min, 29min, and the like.
Preferably, in step (1), the dispersion is carried out until the solution is clear and free of impurities.
Preferably, step (2) further comprises: adding the second part of water into the pulling cylinder.
Preferably, in step (2), the rotation speed of the dispersion machine is 500-.
Preferably, in step (2), the stirring time is 3-5min, such as 3.5min, 4min, 4.5min, etc.
Preferably, in step (3), the rotation speed of the dispersion machine is increased to 1000-.
Preferably, in step (3), the dispersing time is 20-30min, such as 21min, 22min, 23min, 24min, 25min, 26min, 27min, 28min, 29min, etc.
Preferably, in step (3), the titanium pigment is dispersed to a fineness of less than or equal to 40 μm, such as 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, 38 μm, etc.
Preferably, step (3) further comprises: and cleaning the wall of the pulling cylinder and the residual titanium dioxide on the dispersing shaft of the dispersing machine by using clear water.
Preferably, in the step (4), the rotation speed of the dispersion machine is 500-700r/min, such as 510r/min, 520r/min, 530r/min, 540r/min, 550r/min, 560r/min, 570r/min, 580r/min, 590r/min, 600r/min, 620r/min, 640r/min, 660r/min, 680r/min, and the like.
Preferably, in step (4), the time for the first stirring is 3-5min, such as 3.5min, 4min, 4.5min, etc.
Preferably, in step (4), the time for the second stirring is 5-10min, such as 6min, 7min, 8min, 9min, etc.
Preferably, the preparation method specifically comprises the following steps:
(1) mixing the sheet lithium magnesium silicate powder with the formula amount and the first part of water according to the mass ratio of 1 (7-10), and dispersing until the solution is transparent and free of impurities to obtain a lithium magnesium silicate powder solution;
(2) adding the second part of water into a container, starting a dispersion machine, setting the rotating speed of the dispersion machine to be 500-600r/min, adding the dispersant, the wetting agent, the defoaming agent and the PH regulator into the second part of water according to the formula amount, and stirring for 3-5min to obtain a first mixed solution; the total amount of the first part of water and the second part of water is the addition amount of water in the water-based ready mixed paint;
(3) adding titanium dioxide into the first mixed solution, increasing the rotating speed of a dispersion machine to 1000-1200r/min, cleaning the cylinder wall of the pulling cylinder and the residual titanium dioxide on a dispersion shaft of the dispersion machine by using clear water, and dispersing for 20-30min until the fineness of the titanium dioxide is less than or equal to 40 mu m to obtain a second mixed solution;
(4) reducing the rotating speed of a dispersion machine to 700-;
(5) and adding the color paste with the formula amount into the third mixed solution to obtain the water-based ready-mixed paint.
The invention also aims to provide application of the water-based ready-mixed paint, which is applied to door frames, windows, furniture, fire hydrants, pipelines or guardrails.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the flaky lithium magnesium silicate powder with a specific content is added into the water-based ready-mixed paint, so that the water-based ready-mixed paint has higher storage stability, and has the advantages of strong covering power, small color difference, good water resistance, fast surface drying, good leveling property and the like, the phenomena of layering and precipitation do not occur after the water-based ready-mixed paint is stored for 30 days at 50 ℃, the covering power can reach more than 80, the color difference delta E is less than 2, the early water resistance is passed, the surface drying time is less than or equal to 15min, the leveling property is good, and the freeze-thaw stability is.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The raw materials used in the following examples and comparative examples are shown in the following table:
the following examples and comparative examples provide water-based ready-mixed paints, and the specific formulations are shown in tables 1-1 and tables 1-2, respectively.
TABLE 1-1
Tables 1 to 2
In the above table, "-" means that the corresponding substance was not added.
The preparation of the aqueous ready-mixed paint of example 1 is as follows:
(1) mixing the sheet lithium magnesium silicate powder with the formula amount and the first part of water according to the mass ratio of 1:9, and dispersing until the solution is transparent and free of impurities to obtain a lithium magnesium silicate powder solution;
(2) adding the second part of water into a container, starting a dispersion machine, setting the rotating speed of the dispersion machine to be 500r/min, adding the dispersant, the wetting agent, the defoaming agent and the PH regulator into the second part of water according to the formula amount, and stirring for 3min to obtain a first mixed solution; the total amount of the first part of water and the second part of water is the addition amount of water in the water-based ready mixed paint;
(3) adding titanium dioxide into the first mixed solution, increasing the rotating speed of a dispersion machine to 1000r/min, cleaning the cylinder wall of the pull cylinder and the residual titanium dioxide on a dispersion shaft of the dispersion machine by using clear water, and dispersing for 10min until the fineness of the titanium dioxide is less than or equal to 40 mu m to obtain a second mixed solution;
(4) reducing the rotating speed of a dispersion machine to 500r/min, adding a film forming aid, a preservative, an anti-flash rust agent and a water-based acrylic emulsion in a formula amount, stirring for 3min for the first time, adding the lithium magnesium silicate powder solution and the thickening agent, and stirring for 5min for the second time to obtain a third mixed solution;
(5) and adding the color paste with the formula amount into the third mixed solution to obtain the water-based ready-mixed paint.
The preparation of the aqueous ready-mixed paint of example 2 is as follows:
(1) mixing the sheet lithium magnesium silicate powder with the formula amount and the first part of water according to the mass ratio of 1:7, and dispersing until the solution is transparent and free of impurities to obtain a lithium magnesium silicate powder solution;
(2) adding the second part of water into a container, starting a dispersion machine, setting the rotating speed of the dispersion machine to be 600r/min, adding the dispersant, the wetting agent, the defoaming agent and the PH regulator into the second part of water according to the formula amount, and stirring for 5min to obtain a first mixed solution; the total amount of the first part of water and the second part of water is the addition amount of water in the water-based ready mixed paint;
(3) adding titanium dioxide into the first mixed solution, increasing the rotating speed of a dispersion machine to 1200r/min, cleaning the cylinder wall of the pulling cylinder and the residual titanium dioxide on a dispersion shaft of the dispersion machine by using clear water, and dispersing for 30min until the fineness of the titanium dioxide is less than or equal to 40 mu m to obtain a second mixed solution;
(4) reducing the rotating speed of a dispersion machine to 700r/min, adding a film forming aid, a preservative, an anti-flash rust agent and a water-based acrylic emulsion in a formula amount, stirring for 5min for the first time, adding the lithium magnesium silicate powder solution and the thickening agent, and stirring for 10min for the second time to obtain a third mixed solution;
(5) and adding the color paste with the formula amount into the third mixed solution to obtain the water-based ready-mixed paint.
The preparation of the water-based ready-mixed paint of example 3 is as follows:
(1) mixing the sheet lithium magnesium silicate powder with the formula amount and the first part of water according to the mass ratio of 1:10, and dispersing until the solution is transparent and free of impurities to obtain a lithium magnesium silicate powder solution;
(2) adding the second part of water into a container, starting a dispersion machine, setting the rotating speed of the dispersion machine to be 600r/min, adding the dispersant, the wetting agent, the defoaming agent and the PH regulator into the second part of water according to the formula amount, and stirring for 4min to obtain a first mixed solution; the total amount of the first part of water and the second part of water is the addition amount of water in the water-based ready mixed paint;
(3) adding titanium dioxide into the first mixed solution, increasing the rotating speed of a dispersion machine to 1100r/min, cleaning the cylinder wall of the pull cylinder and the residual titanium dioxide on a dispersion shaft of the dispersion machine by using clear water, and dispersing for 25min until the fineness of the titanium dioxide is less than or equal to 40 mu m to obtain a second mixed solution;
(4) reducing the rotating speed of a dispersion machine to 600r/min, adding a film forming aid, a preservative, an anti-flash rust agent and a water-based acrylic emulsion in a formula amount, stirring for 4min for the first time, adding the lithium magnesium silicate powder solution and the thickening agent, and stirring for 8min for the second time to obtain a third mixed solution;
(5) and adding the color paste with the formula amount into the third mixed solution to obtain the water-based ready-mixed paint.
Examples 4 to 10 and comparative examples 2 and 3 were prepared in the same manner as in example 1.
The method for preparing the water-based ready-mixed paint in comparative example 1 is different from that of example 1 only in that step (1) is not performed and lithium magnesium silicate powder solution is not added in step (4).
The process for preparing the water-based ready-mixed paint of comparative example 4 differs from that of example 1 only in that in step (3), titanium dioxide is replaced with ground calcium carbonate.
Performance testing
The performance tests in table 2 were performed on the aqueous ready-mixed paints of the above examples and comparative examples, and the results are shown in table 2. Wherein "Ok" represents no abnormality by the test and "\" represents paint film cracking and could not be tested.
TABLE 2
According to the test data, the water-based ready-mixed paint provided by the invention does not generate the phenomena of layering and precipitation after being stored for 30 days at 50 ℃. By data: the covering power can reach more than 80, the color difference delta E is less than 2, the early water resistance is passed, the surface drying time is less than or equal to 15min, the leveling property is good, the freeze-thaw stability is passed, and the product system is stable, strong in covering power, high in drying speed and convenient to construct. The long-term storage stability of the product is prolonged. In conclusion, the water-based ready mixed paint obtained by the invention improves the problem of floating or precipitation of color paste and powder after long-term storage, does not cause harm to users, is environment-friendly, and has certain referential significance and industrial value for related research, development, production and sales personnel.
Compared examples 1 and 2 respectively do not add sheet lithium magnesium silicate powder or only add 0.1% sheet lithium magnesium silicate powder, the water-based ready mixed paint still has obvious layering and precipitation phenomena, and compared example 3 adds 0.5% sheet lithium magnesium silicate powder, leveling property becomes poor, and construction difficulty is big. It is known that the optimum stability and leveling effects can be obtained only when the amount of the flaky lithium magnesium silicate powder added is within the range of 0.2 to 0.4%.
Comparative example 4 the use of ground limestone instead of titanium dioxide clearly worsens the hiding power of the water-borne ready-mixed paint, which demonstrates that titanium dioxide can further improve the hiding power in the specific system of the invention.
From examples 3 and 6-7, it can be seen that lithium magnesium silicate is still helpful for system stability when the content of powder and color paste is changed and different types of color pastes are replaced.
It is clear from examples 4 to 5 that too low a viscosity of the acrylic emulsion (example 4) results in poor freeze-thaw stability, and too high a viscosity (example 5) results in poor water resistance.
From examples 8 to 9, it can be seen that when the addition amount of the film forming aid is 2 to 4%, the effect is best, and the content of the film forming aid is too small (example 8), so that the lowest film forming temperature of a paint film is higher than room temperature, the anti-cracking performance is poor, and the paint film cracks after being dried; too much film-forming aid content (example 9) resulted in slow open time of the coating film due to high boiling point of the film-forming aid.
The specific surface area of the sheet-like lithium magnesium silicate powder used in example 10 was > 340m2g, the levelling of the aqueous ready-mixed paint worsens, it is thus evident that a specific surface area of < 340m is chosen2And g, the flaky lithium magnesium silicate powder is more favorable for improving the leveling property of the water-based ready mixed paint.
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The water-based ready-mixed paint is characterized by comprising the following components in percentage by mass:
2. the aqueous ready-mixed paint according to claim 1, wherein the solid content of the aqueous acrylic emulsion is 46-48%;
preferably, the viscosity of the aqueous acrylic emulsion is 200-;
preferably, the titanium dioxide comprises rutile type titanium dioxide;
preferably, the content of titanium dioxide in the titanium dioxide is more than 95%;
preferably, the sheet lithium magnesium silicate powder is nano-scale sheet lithium magnesium silicate powder;
preferably, the specific surface area of the sheet lithium magnesium silicate powder is less than 340m2g。
3. The aqueous ready-mixed paint according to claim 1 or 2, wherein the auxiliary agent comprises any one or a combination of at least two of a film forming aid, a dispersing agent, a wetting agent, a defoaming agent, a flash rust inhibitor, a PH adjuster, a preservative, or a thickener.
4. The aqueous ready-mixed paint according to claim 3, wherein the film forming aid comprises an ester solvent and/or an ether solvent;
preferably, the dispersant comprises a copolymer solution containing pigment affinic groups;
preferably, the wetting agent comprises a siloxane-based wetting agent;
preferably, the antifoaming agent comprises a polyether siloxane type antifoaming agent and/or a mineral oil type antifoaming agent;
preferably, the anti-flash rust agent comprises a metal organic chelate;
preferably, the PH adjusting agent comprises 2-amino-2-methyl-1-propanol;
preferably, the preservative comprises an isothiazolinone preservative;
preferably, the thickener comprises a nonionic hydrophobically modified polyurethane rheology agent.
5. The aqueous ready-mixed paint according to claim 3 or 4, characterized in that the addition amount of the film forming aid is 2-4%;
preferably, the addition amount of the dispersant is 0.8-1.5%;
preferably, the addition amount of the wetting agent is 0.1-0.3%;
preferably, the addition amount of the defoaming agent is 0.2-0.4%;
preferably, the addition amount of the flash rust inhibitor is 0.2-1%;
preferably, the addition amount of the pH regulator is 0.1-0.2%;
preferably, the addition amount of the preservative is 0.1-0.2%;
preferably, the thickener is added in an amount of 0.5 to 1.5%.
6. The aqueous ready-mixed paint according to any one of claims 1 to 5, which comprises the following components in percentage by mass:
7. a method for preparing an aqueous ready-mixed paint according to any one of claims 1 to 6, characterized in that it comprises the following steps: mixing the water-based acrylic emulsion, the titanium dioxide, the flaky lithium magnesium silicate powder, the color paste and the auxiliary agent with water according to the formula ratio, and stirring to obtain the water-based ready-mixed paint.
8. The method of claim 7, comprising the steps of:
(1) mixing the sheet lithium magnesium silicate powder with the formula amount with the first part of water, and dispersing to obtain lithium magnesium silicate powder solution;
(2) starting a dispersion machine, adding the dispersant, the wetting agent, the defoaming agent and the pH regulator into the second part of water according to the formula ratio, and stirring to obtain a first mixed solution; the total amount of the first part of water and the second part of water is the addition amount of water in the water-based ready mixed paint;
(3) adding titanium dioxide into the first mixed solution, increasing the rotating speed of a dispersion machine, and dispersing to obtain a second mixed solution;
(4) reducing the rotating speed of a dispersion machine, adding a film forming aid, a preservative, an anti-flash rust agent and a water-based acrylic emulsion in a formula amount, stirring for the first time, adding the lithium magnesium silicate powder solution and the thickening agent, and stirring for the second time to obtain a third mixed solution;
(5) and adding the color paste with the formula amount into the third mixed solution to obtain the water-based ready-mixed paint.
9. The preparation method according to claim 8, wherein in the step (1), the mass ratio of the sheet lithium magnesium silicate powder to the first part of water is 1 (7-10);
preferably, in the step (1), the dispersing time is 20-30 min;
preferably, in the step (1), the solution is dispersed to be transparent and free of impurities;
preferably, step (2) further comprises: adding the second part of water into the pulling cylinder;
preferably, in the step (2), the rotation speed of the dispersion machine is 500-;
preferably, in the step (2), the stirring time is 3-5 min;
preferably, in the step (3), the rotation speed of the dispersion machine is increased to 1000-;
preferably, in the step (3), the dispersing time is 20-30 min;
preferably, in the step (3), the titanium pigment is dispersed until the fineness of the titanium pigment is less than or equal to 40 mu m;
preferably, step (3) further comprises: cleaning the wall of the pulling cylinder and the residual titanium dioxide on a dispersing shaft of the dispersing machine by using clear water;
preferably, in the step (4), the rotation speed of the dispersion machine is 500-;
preferably, in the step (4), the time for the first stirring is 3-5 min;
preferably, in the step (4), the time for the second stirring is 5-10 min.
10. Use of an aqueous ready-mixed paint according to any one of claims 1 to 6, characterized in that it is applied to door frames, windows, furniture, fire hydrants, pipes or guardrails.
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| CN110668734A (en) * | 2018-07-03 | 2020-01-10 | 河南裕彩科技研发有限公司 | Sand-in-sand colorful interior and exterior wall building coating and preparation method thereof |
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| CN104212288A (en) * | 2014-09-04 | 2014-12-17 | 山东秦恒科技有限公司 | Water-based colourful building coating and preparation method thereof |
| CN109535887A (en) * | 2017-08-15 | 2019-03-29 | 哈尔滨绿科科技有限公司 | A kind of environmental protection is complete to imitate mixed paint and preparation method thereof |
| CN107722739A (en) * | 2017-09-14 | 2018-02-23 | 中华制漆（深圳）有限公司 | Water-in-water multicolor coating its preparation method and application |
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