Water-based colored paint as well as preparation method and application thereof

Abstract

The invention provides water-based colored paint as well as a preparation method and application thereof, and relates to the technical field of paint. The water-based colored paint comprises a component A and a component B, wherein the component A comprises rutile titanium dioxide, a hydroxyl acrylic acid copolymer, a hydroxyl acrylic acid dispersion, silica sol and water; wherein the component B comprises an aziridine cross-linking agent. A paint film formed by the water-based colored paint is good in boiling resistance and hardness, long in opening time and excellent in acid resistance and alkali resistance, water serves as a solvent, no oil-based solvent exists, and the water-based colored paint is healthy and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a water-based paint and a preparation method and application thereof. Background Art

[0002] Oil-based paint is a type of paint with drying oil as the main film-forming substance. It is widely used in many fields, including construction, furniture, machinery manufacturing, railways, ships, aerospace, etc. Oil-based paint is widely used in various occasions due to its unique properties, such as waterproof, anti-corrosion, wear resistance, durability, etc. In the field of construction, oil-based paint is widely used in waterproof and moisture-proof treatment of the exterior walls, roofs, walls, etc. of buildings, and can also be used for fire prevention. The protective film formed by it can effectively prevent or delay the erosion of building materials by moisture, oxygen, etc., thereby extending the service life of the building. In addition, oil-based paint can also be used in underground engineering and water conservancy engineering. Oil-based paint not only has a certain decorative effect, but also has weather resistance, rust resistance, corrosion resistance, impact resistance, good adhesion, etc., but it also has some disadvantages, such as poor environmental protection, strong odor of organic solvents, etc. Traditional oil-based paint mainly uses organic solvents as dispersion media, volatilizes a large amount of toxic and harmful substances such as benzene and formaldehyde, causing serious environmental damage.

[0003] Insulation decorative panels are a new type of exterior wall energy-saving structure that has emerged in recent years. Through factory prefabrication, it has achieved the combination of insulation and decoration, greatly reducing the manual work on the project site and greatly improving the quality of the project. However, the oil-based system is commonly used in the market for thermal insulation integrated panels, which has irreversible damage to the workers' bodies and the environment. Long-term contact will reduce the body's immunity, thus having serious negative effects on the human digestive system, nervous system and hematopoietic function. It is a general trend to change its oil-based system to a water-based system and use environmentally friendly coatings. Naturally, water-based coatings have become the most important one.

[0004] CN 113956766A discloses a long-activation-period water-based two-component polyurethane coating, a preparation method and application thereof. The main components include water-based hydroxy acrylic dispersion, terminal amine polymer, sulfonate surfactant, water-based additive, color paste, solvent, water, etc. The hardness is only H, which does not meet the current requirement of 2H for thermal insulation integrated panels.

[0005] CN 108384364A discloses a two-component water-based paint and a preparation method thereof. By rationally compounding an acrylic compound emulsion and a water-based epoxy resin compound, the synergistic effect between the two is fully utilized, and the problem of poor salt spray resistance of the water-based acrylic compound emulsion can be effectively solved. At the same time, the excellent weather resistance of the acrylic compound emulsion is maintained, and the bottom and top are integrated. However, the strength thereof does not reach 2H, and the artificial aging resistance time is short.

[0006] CN115572345A discloses an inorganic hybrid acrylic emulsion and a preparation method, a coating and an application thereof. The addition of a silane coupling agent and an alkali metal silicate can achieve hybridization of the acrylic emulsion, and the resulting inorganic hybrid acrylic emulsion has a relatively complicated preparation process and a relatively high cost.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The purpose of the present invention is to provide a water-based paint and a preparation method and application thereof. The paint film formed by the water-based paint of the present invention has good water boiling resistance and hardness, a long open time, excellent acid resistance and alkali resistance, and uses water as a solvent without oily solvent, which is healthy and environmentally friendly.

[0009] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0010] In a first aspect, the present invention provides a water-based paint, the water-based paint comprising component A and component B;

[0011] Wherein, the component A comprises: rutile titanium dioxide, hydroxy acrylic acid copolymer, hydroxy acrylic acid dispersion, silica sol and water;

[0012] Wherein, the B component includes: an aziridine cross-linking agent.

[0013] Preferably, the component A comprises the following components by weight:

[0014] 15-20 parts of rutile titanium dioxide, 15-30 parts of hydroxy acrylic copolymer, 15-30 parts of hydroxy acrylic dispersion, 5-15 parts of silica sol, and 15-20 parts of water.

[0015] Preferably, the content of hydroxyl groups in the hydroxyl acrylic copolymer is 3-4%; and the solid content of the hydroxyl acrylic copolymer is 42-44wt%.

[0016] Preferably, the hydroxyl value of the hydroxylated acrylic dispersion is 135 to 145 mgKOH / g; and the solid content of the hydroxylated acrylic dispersion is 41 to 43 wt %.

[0017] Preferably, the particle size of the silica sol is 20-40 nm; the solid content of the silica sol is 30-32 wt %; and the pH of the silica sol is 9-11.

[0018] Preferably, the component A also includes isopropyl triisostearoyl titanate.

[0019] Preferably, the content of isopropyl triisostearoyl titanate is 0.05 to 0.5 parts, preferably 0.1 to 0.2 parts.

[0020] Preferably, the component A also includes a functional auxiliary agent.

[0021] Preferably, the functional additive includes any one or a combination of at least two of a dispersant, a wetting agent, a defoaming agent, a pH regulator, an antifreeze agent, a film-forming aid, a bactericide, a mildewcide or a leveling agent.

[0022] Preferably, the component A includes the following functional additives by weight:

[0023] Dispersant 0.5-1 part, wetting agent 0.2-0.4 part, defoaming agent 0.1-0.2 part, pH adjuster 0.05-0.2 part, antifreeze agent 1-2 parts, film-forming aid 1.5-2.5 parts, bactericide 0.05-0.1 part, mildewproofing agent 0.05-0.1 part, leveling agent 0.3-1 part.

[0024] Preferably, the dispersant is a polycarboxylate sodium salt type dispersant.

[0025] Preferably, the wetting agent is isomeric tridecyl alcohol polyoxyethylene ether.

[0026] Preferably, the defoamer is a silicone emulsion defoamer containing silicon dioxide.

[0027] Preferably, the pH regulator is a multifunctional amine auxiliary agent.

[0028] Preferably, the antifreeze agent is propylene glycol.

[0029] Preferably, the film-forming aid is alcohol ester dodecahydrate.

[0030] Preferably, the fungicide is a nitrogen-sulfur heterocyclic compound.

[0031] Preferably, the mildew preventer comprises carbendazim, diuron and OIT in a mass ratio of 9:20:3.

[0032] Preferably, the leveling agent is non-ionic polyurethane.

[0033] Preferably, the mass ratio of component A to component B is (4-8):1, preferably 6:1.

[0034] In a second aspect, the present invention provides a method for preparing the water-based paint as described in the first aspect, the preparation method comprising:

[0035] The raw materials in the A component are mixed and then mixed with the B component to obtain the water-based paint.

[0036] Preferably, the A component is mixed by the following steps:

[0037] A dispersant, a wetting agent and a defoaming agent are added to the water, and the mixture is stirred for the first time. A pH adjuster and rutile titanium dioxide are then added in sequence, and the mixture is stirred for the second time. A hydroxy acrylic copolymer, a hydroxy acrylic dispersion, a silica sol, isopropyl triisostearyl titanate, an antifreeze agent, a film-forming aid, a bactericide and a mildewcide are then added, and the mixture is stirred for the third time. A leveling agent is then added, and the mixture is stirred for the fourth time. Finally, the viscosity of the system is adjusted with water to obtain the component A.

[0038] Preferably, the rotation speed of the first stirring is 400-600 rpm, and the time of the first stirring is 5-8 min.

[0039] Preferably, the rotation speed of the second stirring is 1400-1600 rpm, the time of the first stirring is 30-40 min; and the fineness of the slurry after the second stirring is ≤30 μm.

[0040] Preferably, the rotation speed of the third stirring is 600-700 rpm, and the time of the third stirring is 5-8 min.

[0041] Preferably, the rotation speed of the fourth stirring is 600-700 rpm, and the time of the fourth stirring is 5-8 min.

[0042] Preferably, the viscosity of component A is 5000-20000 KU.

[0043] Preferably, the rotation speed of mixing the component A with the component B is 400-700 rpm, and the time of mixing the component B with the component B is 1-5 min.

[0044] In a third aspect, the present invention provides a use of the water-based paint as described in the first aspect in preparing a paint film of a thermal insulation integrated board.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] (1) The present invention uses a hydroxy acrylic acid copolymer and a hydroxy acrylic acid dispersion in combination, supplemented with silica sol, and adds a certain amount of aziridine crosslinking agent. The water boiling resistance (80° C.) of the paint film reaches 7 days and the hardness reaches 3H, which meets the requirements of current water-based industrial paints.

[0047] (2) The present invention uses triisostearyl titanate isopropyl (TTS), which increases the compatibility with the organic polymer base material, facilitates the wetting and dispersion of the powder aggregate by the organic polymer base material, and has good color development. Through the chemical coupling effect between the TTS and the substrate, the adhesion of the paint film is improved, and the room temperature adhesion and the water boiling adhesion are both less than level 1, and the flexibility can be increased, and the paint film is hard but not brittle.

[0048] (3) In the present invention, silica sol with a particle size of 20 to 40 nm is added to the mixture of hydroxyl acrylic acid copolymer and hydroxyl acrylic acid dispersion. Due to the barrier effect, the contact probability of hydroxyl group and nitrogen pyridine is reduced, thereby extending the open time, which can reach 2 hours in an environment of 40° C., meeting the construction time requirement.

[0049] (4) The solvent used in the present invention is water, which does not contain oily solvents and is healthy and environmentally friendly, thus meeting environmental requirements. DETAILED DESCRIPTION

[0050] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0051] It should be noted that specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0052] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In a first aspect, the present invention provides a water-based paint, the water-based paint comprising component A and component B;

[0054] Wherein, the component A comprises: rutile titanium dioxide, hydroxy acrylic copolymer, hydroxy acrylic dispersion, silica sol, triisostearyl isopropyl titanate and water;

[0055] Wherein, the B component includes: an aziridine cross-linking agent.

[0056] The main film-forming substances of the present invention are hydroxyl acrylic copolymer and hydroxyl acrylic dispersion; wherein the hydroxyl acrylic copolymer is an aqueous dispersion obtained by free radical emulsion polymerization, contains an emulsifier, does not contain a solvent, has a large polymer molecular weight, can form a single component film, but has low fullness; and the hydroxyl acrylic dispersion is formed by solution polymerization, does not contain an emulsifier, contains a solvent, has a small molecular weight, a small particle size, belongs to medium-high hydroxyl, and has high fullness; through the complementary nature of the two, a water-based paint with good leveling, fullness, dryness and gloss can be obtained.

[0057] The present invention adds silica sol with a particle size of 20 to 40 nm to a mixture of a hydroxy acrylic copolymer and a hydroxy acrylic dispersion. Due to the barrier effect, the silica sol has the functions of rapid and long-term formaldehyde removal, good weather resistance, high color development, excellent dispersibility, and good environmental protection. However, there are still some disadvantages, such as poor water resistance and brittle coating. However, the present invention can solve these problems by blending with the hydroxy acrylic copolymer and the hydroxy acrylic dispersion, fully leveraging the strengths and avoiding the weaknesses, and complementing each other's advantages, so that the coating has both organic and inorganic characteristics.

[0058] In the present invention, the selected adhesion promoter is triisostearoyl titanate isopropyl (TTS), which contains an isopropoxy group that is a hydrolyzed group that can couple with inorganic substances, so that TTS is coated on the surface of inorganic pigments and fillers in a single molecule state to replace the originally adsorbed trace moisture and gas, and at the same time, the long carbon chain hydrophobic non-water-mediated group in the molecule increases the compatibility with the organic polymer base material, reduces the free energy of the interface, and is conducive to the wetting and dispersion of the powder aggregate by the organic polymer base material. The short-chain alkoxy group hydrolyzed by TTS can react with the hydroxyl group on the surface of the inorganic substance to achieve the purpose of chemical coupling, thereby improving the adhesion of the paint film to the substrate, improving the friction resistance, improving the impact strength, and increasing the flexibility.

[0059] As an optional embodiment of the present invention, the component A comprises the following components in parts by weight:

[0060] 15-20 parts of rutile titanium dioxide, 15-30 parts of hydroxy acrylic copolymer, 15-30 parts of hydroxy acrylic dispersion, 5-15 parts of silica sol, 0.05-0.5 parts of triisostearyl titanate isopropyl, and 15-20 parts of water.

[0061] As an optional embodiment of the present invention, in the component A, the content of rutile titanium dioxide is 15 to 20 parts, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.

[0062] As an optional embodiment of the present invention, the rutile titanium dioxide is a general-purpose titanium dioxide obtained by the sulfuric acid method, and is a rutile titanium dioxide pigment that uses aluminum oxide and zirconium dioxide as inorganic coatings and has an organic surface treatment. For example, it can be the rutile titanium dioxide produced by Longmang Baili, whose brand is R699; it is a general-purpose titanium dioxide obtained by the sulfuric acid method, a white powder, with stable chemical properties, and a zirconium and aluminum coating and special organic treatment on the surface. It has good whiteness, brightness, and glossiness, high hiding power and tinting power, is easy to disperse, and has good weather resistance and anti-powdering ability.

[0063] As an optional embodiment of the present invention, in the A component, the content of the hydroxy acrylic copolymer is 15 to 30 parts, for example, it can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, etc.

[0064] As an optional embodiment of the present invention, the hydroxylated acrylic acid copolymer is Badful 3911.

[0065] As an optional embodiment of the present invention, the content of hydroxyl groups in the hydroxy acrylic copolymer is 3-4%, for example, it can be 3%, 3.1%, 3.2%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, etc.

[0066] As an optional embodiment of the present invention, the solid content of the hydroxy acrylic acid copolymer is 42-44 wt%, for example, it can be 42 wt%, 42.5 wt%, 43 wt%, 43.5 wt%, 44 wt%, etc.

[0067] As an optional embodiment of the present invention, in the component A, the content of hydroxy acrylic dispersion is 15 to 30 parts, for example, it can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, etc.

[0068] As an optional embodiment of the present invention, the hydroxylated acrylic acid dispersion is B242A produced by Vinova Chemicals.

[0069] As an optional embodiment of the present invention, the hydroxyl value of the hydroxylated acrylic dispersion is 135-145 mgKOH / g, for example, it can be 135 mgKOH / g, 136 mgKOH / g, 137 mgKOH / g, 138 mgKOH / g, 139 mgKOH / g, 140 mgKOH / g, 141 mgKOH / g, 142 mgKOH / g, 143 mgKOH / g, 144 mgKOH / g, 145 mgKOH / g, etc.

[0070] As an optional embodiment of the present invention, the solid content of the hydroxylated acrylic dispersion is 41-43 wt %, for example, 41 wt %, 41.5 wt %, 42 wt %, 42.5 wt %, 43 wt %, etc.

[0071] In the present invention, the selected hydroxy acrylic acid copolymer and hydroxy acrylic acid dispersion have good compatibility, the mutual diffusion degree of the macromolecular segments of the two phases in the blend is large, the thickness of the two-phase interface layer is large, the interface is relatively fuzzy, and there will be no pathological conditions such as the difference in gloss of the paint film caused by compatibility. The adhesion of the hydroxy acrylic acid copolymer and the hydroxy acrylic acid dispersion depends on the chemical combination between molecules and also depends on the secondary valence force between the two phases. The magnitude of the secondary valence force is mainly determined by the interfacial tension. The interfacial tension of the two phases of these two substances is small, so the bonding strength is also relatively high. At the same time, the hydroxy acrylic acid copolymer and the hydroxy acrylic acid dispersion have good compatibility, and the polymer segments have a high degree of diffusion each other, which also causes the bonding strength of the interface to be enhanced, and the mechanical properties of the blend are excellent.

[0072] As an optional embodiment of the present invention, in the component A, the content of silica sol is 5 to 15 parts, for example, it can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.

[0073] As an optional embodiment of the present invention, the particle size of the silica sol is 20 to 40 nm, for example, it can be 20 nm, 22 nm, 24 nm, 26 nm, 28 nm, 30 nm, 32 nm, 34 nm, 36 nm, 38 nm, 40 nm, etc.

[0074] As an optional embodiment of the present invention, the solid content of the silica sol is 30-32wt%, for example, it can be 30wt%, 30.5wt%, 31wt%, 31.5wt%, 32wt% and the like.

[0075] As an optional embodiment of the present invention, the pH value of the silica sol is 9 to 11, for example, it can be 9, 9.5, 10, 10.5, 11, etc.

[0076] As an optional embodiment of the present invention, the silica sol is SLK-S, which has the functions of rapid formaldehyde removal and long-term formaldehyde removal, weather resistance, high color development, dispersibility, and good environmental protection.

[0077] In the present invention, silica sol with a particle size of 20 to 40 nm is added to the mixture of hydroxyl acrylic copolymer and hydroxyl acrylic dispersion. Due to the barrier effect, the contact probability of hydroxyl and nitrogen pyridine will be reduced, thereby extending the open time. In addition, according to the thermodynamic equilibrium theory, the silica gel precipitated when the silica sol hardens has the effect of blocking capillary gaps and preventing water penetration. The SiO2 during the precipitate has high activity and can produce high adhesion to pigment and filler particles. The liquid silica sol absorbs carbon dioxide in the air to form amorphous silicic acid and gradually dries and solidifies, thereby enhancing the hardness of the paint film.

[0078] As an optional embodiment of the present invention, the component A further comprises a functional additive.

[0079] As an optional embodiment of the present invention, the functional additive includes any one of a dispersant, a wetting agent, a defoaming agent, a pH regulator, an antifreeze agent, a film-forming aid, a bactericide, a mildewcide or a leveling agent, or a combination of at least two thereof.

[0080] As an optional embodiment of the present invention, the component A includes the following functional additives by weight:

[0081] Dispersant 0.5-1 part, wetting agent 0.2-0.4 part, defoaming agent 0.1-0.2 part, pH adjuster 0.05-0.2 part, antifreeze agent 1-2 parts, film-forming aid 1.5-2.5 parts, bactericide 0.05-0.1 part, mildewproofing agent 0.05-0.1 part, leveling agent 0.3-1 part.

[0082] As an optional embodiment of the present invention, in the component A, the content of the dispersant is 0.5 to 1 part, for example, it can be 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, etc.

[0083] As an optional embodiment of the present invention, the dispersant is a polycarboxylate sodium salt type dispersant.

[0084] In the present invention, a polycarboxylate sodium salt type dispersant is selected as the dispersant, which not only has low foaming property, but also improves the fluidity of the water-based paint and has the excellent performance of stabilizing the viscosity of the water-based paint.

[0085] As an optional embodiment of the present invention, in the component A, the content of the wetting agent is 0.2 to 0.4 parts, for example, it can be 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, etc.

[0086] As an optional embodiment of the present invention, the wetting agent is isomeric tridecyl alcohol polyoxyethylene ether.

[0087] As an optional embodiment of the present invention, the wetting agent is a product produced by Sasol Chemical, with the brand name NOVELUTION 315, isomeric C13 fatty alcohol polyoxyethylene (1.5) ether, which is a non-ionic wetting agent.

[0088] As an optional embodiment of the present invention, in the component A, the content of the defoaming agent is 0.1 to 0.2 parts, for example, it can be 0.1 parts, 0.12 parts, 0.14 parts, 0.16 parts, 0.18 parts, 0.2 parts, etc.

[0089] As an optional embodiment of the present invention, the defoaming agent is a silicone emulsion defoaming agent containing silicon dioxide.

[0090] As an optional embodiment of the present invention, the defoamer is a mineral oil defoamer from Hairun Chemical, which is a grayish white to light yellow turbid liquid, a standard defoamer with a pigment volume concentration ranging from 20 to 70%, and contains a small amount of coating-compatible silicone to enhance the defoaming performance.

[0091] As an optional embodiment of the present invention, in the component A, the content of the pH adjuster is 0.05 to 0.2 parts, for example, it can be 0.05 parts, 0.06 parts, 0.08 parts, 0.1 parts, 0.12 parts, 0.14 parts, 0.16 parts, 0.18 parts, 0.2 parts, etc.

[0092] As an optional embodiment of the present invention, the pH regulator is a multifunctional amine auxiliary agent.

[0093] As an optional embodiment of the present invention, the pH adjuster is a product produced by Solvay, with the brand name AN130, which can provide pH stability, promote color acceptance, and can also be used as a co-dispersant and wetting agent.

[0094] As an optional embodiment of the present invention, in the component A, the content of the antifreeze agent is 1 to 2 parts, for example, it can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0095] As an optional embodiment of the present invention, the antifreeze agent is propylene glycol.

[0096] As an optional embodiment of the present invention, in the component A, the content of the film-forming aid is 1.5 to 2.5 parts, for example, it can be 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.5 parts, etc.

[0097] As an optional embodiment of the present invention, the film-forming aid is alcohol ester dodecaned.

[0098] As an optional embodiment of the present invention, the film-forming aid is a product of Eastman Chemical Co., Ltd. of the United States, and its brand number is LD506.

[0099] As an optional embodiment of the present invention, the fungicide is a nitrogen-sulfur heterocyclic compound.

[0100] As an optional embodiment of the present invention, the bactericide is a product produced by Hichemis Company, and its brand is MC.

[0101] As an optional embodiment of the present invention, the mildew inhibitor comprises carbendazim, diuron and OIT in a mass ratio of 9:20:3.

[0102] As an optional embodiment of the present invention, the mildew inhibitor is a product of Hichemis Co., Ltd., and its brand is CDT, components: carbendazim 9%, diuron 20%, OIT 3%.

[0103] As an optional embodiment of the present invention, the leveling agent is non-ionic polyurethane.

[0104] As an optional embodiment of the present invention, the mass ratio of component A to component B is (4-8):1, for example, it can be 4:1, 4.5:1, 5:1, 5.5:1, 5.8:1, 6:1, 6.2:1, 6.5:1, 7:1, 7.5:1, 8:1, etc., preferably 6:1.

[0105] In a second aspect, the present invention provides a method for preparing the water-based paint as described in the first aspect, the preparation method comprising:

[0106] The raw materials in the A component are mixed and then mixed with the B component to obtain the water-based paint.

[0107] As an optional embodiment of the present invention, the A component is mixed by the following steps:

[0108] A dispersant, a wetting agent and a defoaming agent are added to the water, and the mixture is stirred for the first time. A pH adjuster and rutile titanium dioxide are then added in sequence, and the mixture is stirred for the second time. A hydroxy acrylic copolymer, a hydroxy acrylic dispersion, a silica sol, isopropyl triisostearyl titanate, an antifreeze agent, a film-forming aid, a bactericide and a mildewcide are then added, and the mixture is stirred for the third time. A leveling agent is then added, and the mixture is stirred for the fourth time. Finally, the viscosity of the system is adjusted with water to obtain the component A.

[0109] As an optional embodiment of the present invention, the rotation speed of the first stirring is 400-600rpm, for example, it can be 400rpm, 420rpm, 440rpm, 460rpm, 480rpm, 500rpm, 520rpm, 540rpm, 560rpm, 580rpm, 600rpm, etc., and the time of the first stirring is 5-8min, for example, it can be 5min, 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, etc.

[0110] As an optional embodiment of the present invention, the rotation speed of the second stirring is 1400-1600rpm, for example, it can be 1400rpm, 1450rpm, 1500rpm, 1550rpm, 1600rpm, etc., the time of the first stirring is 30-40min, for example, it can be 30min, 32min, 34min, 36min, 38min, 40min, etc.; the fineness of the slurry after the second stirring is ≤30μm, for example, it can be 30μm, 28μm, 26μm, 24μm, 22μm, 20μm, 15μm, 10μm, 5μm, 1μm, etc.

[0111] As an optional embodiment of the present invention, the rotation speed of the third stirring is 600-700rpm, for example, it can be 600rpm, 620rpm, 640rpm, 660rpm, 680rpm, 700rpm, and the time of the third stirring is 5-8min, for example, it can be 5min, 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, etc.

[0112] As an optional embodiment of the present invention, the rotation speed of the fourth stirring is 600-700rpm, for example, it can be 600rpm, 620rpm, 640rpm, 660rpm, 680rpm, 700rpm, and the time of the fourth stirring is 5-8min, for example, it can be 5min, 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, etc.

[0113] As an optional embodiment of the present invention, the viscosity of component A is 5000-20000 KU, for example, it can be 5000 KU, 6000 KU, 8000 KU, 10000 KU, 12000 KU, 14000 KU, 16000 KU, 18000 KU, 20000 KU, etc.

[0114] As an optional embodiment of the present invention, the rotation speed of mixing the component A and the component B is 400-700 rpm, for example, it can be 400 rpm, 450 rpm, 500 rpm, 550 rpm, 600 rpm, 650 rpm, 700 rpm, etc., and the mixing time of the component B and the component B is 1-5 min, for example, it can be 1 min, 1.5 min, 2 min, 2.5 min, 3 min, 3.5 min, 4 min, 4.5 min, 5 min, etc.

[0115] In a third aspect, the present invention provides the use of the water-based color paint as described in the first aspect in preparing a paint film of a thermal insulation integrated board.

[0116] The present invention is further described below by way of examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or directly purchased from the market.

[0117] The sources of raw materials in the following examples and comparative examples are as follows:

[0118]

[0119]

[0120] Example 1

[0121] This embodiment provides a water-based paint, which includes component A and component B in a mass ratio of 6:1;

[0122] Wherein, the component A comprises the following components by weight:

[0123]

[0124]

[0125] Make up to 100 parts with deionized water;

[0126] Wherein, the B component is an aziridine cross-linking agent.

[0127] The water-based paint is prepared by the following steps:

[0128] (a) adding deionized water, starting the stirrer, increasing the speed to 500 rpm, then gradually and slowly adding a dispersant, a wetting agent and a defoaming agent, stirring for 6 minutes, and adding a pH adjuster to obtain a first mixed solution;

[0129] (b) slowly adding titanium dioxide powder to the first mixed solution. After the powder is added, the inner wall of the cylinder is washed with some deionized water, the speed is adjusted to 1500 rpm, and high-speed dispersion is performed for 35 minutes to obtain a second mixed solution with a detected fineness of ≤30 μm;

[0130] (c) After the fineness is qualified, the rotation speed is reduced to 650 rpm, and the hydroxy acrylic acid copolymer, hydroxy acrylic acid dispersion, silica sol, antifreeze agent, film-forming aid, triisostearyl titanate isopropyl ester, bactericide and mildewicide are added to the second mixed solution in sequence, and the mixture is blended for 6 minutes to obtain a third mixed solution;

[0131] (d) slowly adding a leveling agent to the third mixed solution in sequence, blending for 7 minutes, and adjusting the viscosity to 90 KU with deionized water to obtain the A component;

[0132] (e) adding the component B to the component A at a mass ratio of 6:1, and stirring at a rotation speed of 550 rpm for 3 min until the mixture is uniform, to obtain the water-based paint.

[0133] Example 2

[0134] This embodiment provides a water-based paint, which includes component A and component B in a mass ratio of 6:1;

[0135] Wherein, the component A comprises the following components by weight:

[0136]

[0137]

[0138] Make up to 100 parts with deionized water;

[0139] Wherein, the B component is an aziridine cross-linking agent.

[0140] The water-based paint is prepared by the following steps:

[0141] (a) adding deionized water, starting the stirrer, increasing the speed to 400 rpm, then gradually and slowly adding a dispersant, a wetting agent and a defoaming agent, stirring for 8 minutes, and adding a pH adjuster to obtain a first mixed solution;

[0142] (b) slowly adding titanium dioxide powder into the first mixed solution, after the powder is added, washing the inner wall of the cylinder with part of the deionized water, adjusting the speed to 1400 rpm, and high-speed dispersion for 40 minutes to obtain a second mixed solution, the fineness of which is ≤30 μm;

[0143] (c) After the fineness is qualified, the rotation speed is reduced to 600 rpm, and the hydroxy acrylic acid copolymer, hydroxy acrylic acid dispersion, silica sol, antifreeze agent, film-forming aid, triisostearyl titanate isopropyl ester, bactericide and mildewicide are added to the second mixed solution in sequence, and the mixture is blended for 8 minutes to obtain a third mixed solution;

[0144] (d) slowly adding a leveling agent to the third mixed solution in sequence, blending for 8 minutes, and adjusting the viscosity to 90 KU with deionized water to obtain the A component;

[0145] (e) adding the component B to the component A at a mass ratio of 6:1, stirring at a rotation speed of 500 rpm for 3 min until the mixture is uniform, to obtain the water-based paint.

[0146] Example 3

[0147] This embodiment provides a water-based paint, which includes component A and component B in a mass ratio of 6:1;

[0148] Wherein, the component A comprises the following components by weight:

[0149]

[0150] Make up to 100 parts with deionized water;

[0151] Wherein, the B component is an aziridine cross-linking agent.

[0152] The water-based paint is prepared by the following steps:

[0153] (a) adding deionized water, starting the stirrer, increasing the speed to 400 rpm, then gradually and slowly adding a dispersant, a wetting agent and a defoaming agent, stirring for 8 minutes, and adding a pH adjuster to obtain a first mixed solution;

[0154] (b) slowly adding titanium dioxide powder into the first mixed solution, after the powder is added, washing the inner wall of the cylinder with part of the deionized water, adjusting the speed to 1400 rpm, and high-speed dispersion for 40 minutes to obtain a second mixed solution, the fineness of which is ≤30 μm;

[0155] (c) After the fineness is qualified, the rotation speed is reduced to 600 rpm, and the hydroxy acrylic acid copolymer, hydroxy acrylic acid dispersion, silica sol, antifreeze agent, film-forming aid, triisostearyl titanate isopropyl ester, bactericide and mildewicide are added to the second mixed solution in sequence, and the mixture is blended for 8 minutes to obtain a third mixed solution;

[0156] (d) slowly adding a leveling agent to the third mixed solution in sequence, blending for 8 minutes, and adjusting the viscosity to 90 KU with deionized water to obtain the A component;

[0157] (e) adding the component B to the component A at a mass ratio of 6:1, stirring at a rotation speed of 500 rpm for 3 min until the mixture is uniform, to obtain the water-based paint.

[0158] Example 4

[0159] This embodiment provides a water-based paint, which is different from Embodiment 1 only in that the mass ratio of component A to component B is 4:1, and other settings are exactly the same as Embodiment 1.

[0160] Example 5

[0161] This embodiment provides a water-based paint, which is different from Embodiment 1 only in that the mass ratio of component A to component B is 8:1, and other settings are exactly the same as those of Embodiment 1.

[0162] Example 6

[0163] This embodiment provides a water-based paint, which is different from Embodiment 1 only in that the content of the hydroxylated acrylic copolymer is reduced to 10 parts, and the content of the hydroxylated acrylic dispersion is increased to 40 parts, and other settings are completely consistent with Embodiment 1.

[0164] Example 7

[0165] This embodiment provides a water-based paint, which is different from Embodiment 1 only in that the content of the hydroxylated acrylic copolymer is increased to 40 parts, and the content of the hydroxylated acrylic dispersion is reduced to 10 parts, and other settings are completely consistent with Embodiment 1.

[0166] Example 8

[0167] This embodiment provides a water-based paint, which is different from the embodiment 1 only in that the silica sol is replaced with a silica sol of equal mass with a particle size of 50 to 100 nm, and the other settings are completely consistent with the embodiment 1.

[0168] Example 9

[0169] This embodiment provides a water-based paint, which is different from Embodiment 1 only in that isopropyl triisostearoyl titanate is replaced with isopropyl distearoyl methacryloyl titanate of equal mass, and other settings are exactly the same as Embodiment 1.

[0170] Example 10

[0171] This embodiment provides a water-based paint, which is different from Embodiment 1 only in that triisostearyl titanate is no longer added to the A component, and the missing part is supplemented to 100 parts with deionized water. Other settings are exactly the same as Embodiment 1.

[0172] Comparative Example 1

[0173] This comparative example provides a water-based paint, which is different from Example 1 only in that silica sol is no longer added, the missing part is supplemented to 100 parts with deionized water, and the other settings are exactly the same as Example 1.

[0174] Comparative Example 2

[0175] This comparative example provides a water-based paint, which is different from Example 1 only in that 25 parts of hydroxylated acrylic copolymer and 25 parts of hydroxylated acrylic dispersion are replaced by 50 parts of hydroxylated acrylic emulsion, and other settings are exactly the same as Example 1.

[0176] Comparative Example 3

[0177] This comparative example provides a water-based paint, which differs from Example 1 only in that 25 parts of hydroxyl acrylic copolymer and 25 parts of hydroxyl acrylic dispersion are replaced by 50 parts of hydroxyl acrylic emulsion, and silica sol is no longer added, and the missing part is supplemented to 100 parts with deionized water. Other settings are exactly the same as Example 1.

[0178] Comparative Example 4

[0179] This comparative example provides a water-based paint, which differs from Example 1 only in that 25 parts of hydroxyl acrylic copolymer and 25 parts of hydroxyl acrylic dispersion are replaced by 50 parts of hydroxyl acrylic emulsion, and triisostearyl isopropyl titanate is no longer added, and the missing part is supplemented to 100 parts with deionized water. Other settings are exactly the same as Example 1.

[0180] Comparative Example 5

[0181] This comparative example provides a water-based paint, which is different from Example 1 only in that no hydroxyl acrylic acid copolymer is added, the content of hydroxyl acrylic acid dispersion is increased to 50 parts, and other settings are completely consistent with Example 1.

[0182] Comparative Example 6

[0183] This comparative example provides a water-based paint, which is different from Example 1 only in that no hydroxy acrylic acid dispersion is added, the content of hydroxy acrylic acid copolymer is increased to 50 parts, and other settings are completely consistent with Example 1.

[0184] Comparative Example 7

[0185] This comparative example provides a water-based paint, which comprises the following components in parts by weight:

[0186]

[0187]

[0188] The specific preparation method comprises the following steps:

[0189] S1. Place the raw materials of component A in an emulsifying tank and disperse them at high speed for 30 minutes into a white emulsion to obtain component A, which is used as a pre-emulsion for standby use; fully mix and dissolve the raw materials of component B to obtain component B, which is used as an initial initiator for standby use; mix the raw materials of component C and disperse them at high speed for 1 hour in a disperser to obtain component C, which is used as a hybrid additive for standby use;

[0190] S2, placing the raw materials for preparing component D in a normal pressure reactor equipped with a thermometer, a reflux condenser and a stirring device, stirring and heating to 84-86°C, adding component B; then dripping component A, the dripping time is 150min, specifically, dripping at a fast and uniform speed 25min before the dripping, and the dripping amount at this dripping speed is 20% of the total amount of component A; then dripping at a medium speed and uniform speed for 30min, and the dripping amount at this dripping speed is 30% of the total amount of component A; dripping at a low speed and uniform speed for the remaining 95min; after the dripping is completed, adding a pH adjuster (i.e., component E) to adjust the pH of the mixed solution to between 5.5 and 6.5, and then keeping the mixture at 84-86°C for 20min to obtain a basic acrylic emulsion;

[0191] S3, slowly adding component C to the basic acrylic emulsion prepared in step S2, the application time is 50 minutes, after the addition is completed, the temperature is kept for reaction for 40 minutes, and then the temperature is lowered to below 40° C. to obtain the product inorganic hybrid acrylic emulsion.

[0192] Test Case

[0193] Test samples: water-based paints provided in Examples 1 to 10 and water-based paints provided in Comparative Examples 1 to 7.

[0194] Test method:

[0195] (1) 80℃ boiling water resistance: The board was cut to a certain size and then placed in an 80℃ water bath for testing.

[0196] (2) Adhesion after boiling at 80°C: in accordance with GB / T 9286-2021.

[0197] (3) Adhesion after immersion in water for 7 days at room temperature: in accordance with GB / T 9286-2021.

[0198] (4) Paint film hardness: GB / T6739-86 "Determination of coating film hardness by pencil method".

[0199] (5) Paint film brittleness: Observe whether the edge of the plate breaks when the cutting machine cuts it.

[0200] (6) Open time: At 40°C, mix components A and B evenly and test the viscosity and gloss change trends.

[0201] (7) Acid resistance: According to GB / T 9274-1988.

[0202] (8) Alkali resistance: Based on GB / T 9265-2009.

[0203] The specific test results are shown in Table 1 below:

[0204] Table 1

[0205]

[0206]

[0207] As shown in Table 1, various properties of the water-based paint of the present invention meet the requirements. The paint film formed by the water-based paint has good water boiling resistance and hardness, a long open time, excellent acid resistance and alkali resistance, and uses water as a solvent without oily solvents, which is healthy and environmentally friendly.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-based paint, characterized in that: The water-based paint comprises component A and component B; Wherein, the component A comprises: rutile titanium dioxide, hydroxy acrylic acid copolymer, hydroxy acrylic acid dispersion, silica sol and water; Wherein, the B component includes: an aziridine cross-linking agent.

2. The water-based paint according to claim 1, characterized in that: The A component comprises the following components by weight: 15-20 parts of rutile titanium dioxide, 15-30 parts of hydroxy acrylic copolymer, 15-30 parts of hydroxy acrylic dispersion, 5-15 parts of silica sol, and 15-20 parts of water.

3. The water-based paint according to claim 1 or 2, characterized in that: The content of hydroxyl groups in the hydroxy acrylic copolymer is 3-4%; the solid content of the hydroxy acrylic copolymer is 42-44wt%; Preferably, the hydroxyl value of the hydroxylated acrylic dispersion is 135 to 145 mgKOH / g; the solid content of the hydroxylated acrylic dispersion is 41 to 43 wt%; Preferably, the particle size of the silica sol is 20-40 nm; the solid content of the silica sol is 30-32 wt %; and the pH of the silica sol is 9-11.

4. The water-based paint according to claim 1, characterized in that: The component A also includes isopropyl triisostearyl titanate; Preferably, the content of isopropyl triisostearoyl titanate is 0.05 to 0.5 parts, preferably 0.1 to 0.2 parts; Preferably, the component A also includes a functional additive; Preferably, the functional additive includes any one or a combination of at least two of a dispersant, a wetting agent, a defoamer, a pH regulator, an antifreeze agent, a film-forming aid, a bactericide, a mildewcide or a leveling agent; Preferably, the component A includes the following functional additives by weight: Dispersant 0.5-1 part, wetting agent 0.2-0.4 part, defoaming agent 0.1-0.2 part, pH adjuster 0.05-0.2 part, antifreeze agent 1-2 parts, film-forming aid 1.5-2.5 parts, bactericide 0.05-0.1 part, mildewproofing agent 0.05-0.1 part, leveling agent 0.3-1 part.

5. The water-based paint according to claim 4, characterized in that: The dispersant is a polycarboxylate sodium salt type dispersant; Preferably, the wetting agent is isomeric tridecanol polyoxyethylene ether; Preferably, the defoamer is a silicone emulsion defoamer containing silicon dioxide; Preferably, the pH regulator is a multifunctional amine auxiliary agent; Preferably, the antifreeze agent is propylene glycol; Preferably, the film-forming aid is alcohol ester dodecahydrate; Preferably, the bactericide is a nitrogen-sulfur heterocyclic compound; Preferably, the mildew inhibitor comprises carbendazim, diuron and OIT in a mass ratio of 9:20:3; Preferably, the leveling agent is non-ionic polyurethane.

6. The water-based paint according to claim 1 or 2, characterized in that: The mass ratio of component A to component B is (4-8):1, preferably 6:

1.

7. A method for preparing a water-based paint according to any one of claims 1 to 6, characterized in that: The preparation method comprises: The raw materials in the A component are mixed and then mixed with the B component to obtain the water-based paint.

8. The method for preparing water-based paint according to claim 7, characterized in that: The A component is mixed by the following steps: Add a dispersant, a wetting agent and a defoamer to the water and stir for the first time; then add a pH adjuster and rutile titanium dioxide in sequence and stir for the second time; then add a hydroxy acrylic copolymer, a hydroxy acrylic dispersion, a silica sol, triisostearyl titanate isopropyl, an antifreeze agent, a film-forming aid, a bactericide and a mildewcide and stir for the third time; then add a leveling agent and stir for the fourth time; finally, adjust the viscosity of the system with water to obtain the A component; Preferably, the first stirring speed is 400-600 rpm, and the first stirring time is 5-8 min; Preferably, the rotation speed of the second stirring is 1400-1600 rpm, the time of the first stirring is 30-40 min; the fineness of the slurry after the second stirring is ≤30 μm; Preferably, the rotation speed of the third stirring is 600-700 rpm, and the time of the third stirring is 5-8 min; Preferably, the rotation speed of the fourth stirring is 600-700 rpm, and the time of the fourth stirring is 5-8 min; Preferably, the viscosity of component A is 5000-20000 KU.

9. The method for preparing a water-based paint according to claim 7, characterized in that: The rotation speed of mixing the A component and the B component is 400-700 rpm, and the time of mixing the B component and the B component is 1-5 minutes.

10. Use of the water-based color paint according to any one of claims 1 to 6 in preparing a paint film of a thermal insulation integrated board.

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