Initial-stage water-resistant coating as well as preparation method and application thereof

Abstract

The invention provides an initial water-resistant coating as well as a preparation method and application thereof, and relates to the technical field of coatings. The initial-stage water-resistant coating is prepared from the following components in parts by weight: 25 to 95 parts of acrylic emulsion, 5 to 75 parts of hydrophobic modified styrene-butadiene latex, 10 to 30 parts of water, 3 to 8 parts of silane coupling agent, 80 to 120 parts of super-hydrophobic sericite, 10 to 30 parts of titanium dioxide, 20 to 40 parts of talcum powder and 1 to 30 parts of functional additive. The bionic hydrophobic and nano hydrophobic principle and the Gibbs-Laguerre embedding method composite technology solve the problem that the initial waterproof effect of a single principle is not ideal; meanwhile, modified butylbenzene and acrylic acid molecules are rapidly and spatially networked to form a compact film under the action of a coalescing agent by adopting a molecular entanglement technology, so that the initial water resistance of a paint film is enhanced, and the problem that the paint film is not water-resistant in the initial stage is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to an initial water-resistant coating, a preparation method and application thereof, and in particular to an initial water-resistant coating, a preparation method and application thereof in the preparation of coatings for containers, vehicles, ships, engineering machinery or military equipment. Background Art

[0002] One-component water-based anti-corrosion coatings have excellent construction properties and environmental protection characteristics. At present, the common one-component water-based anti-corrosion coatings mainly include three systems: acrylic emulsion system, water-based polyurethane system and water-based epoxy ester system. However, the existing water-based anti-corrosion coatings are far behind oil-based coatings in terms of water resistance and corrosion resistance. During use, they often have problems such as cracking, falling off, mildew, short service life, and acid and alkali resistance. Especially after containers, vehicles, and large-scale construction machinery are painted and placed in the open air, due to rainy weather or dew, the newly painted paint film will have the defect of blistering, which will lead to rework, loss of work and time, and increased costs. The initial water resistance of the paint film has become a major problem in the application of coatings engineering.

[0003] CN113999573A discloses a water-based coating, which includes: 35-50 parts of styrene butadiene emulsion containing ketone carbonyl; 5-25 parts of acrylic emulsion containing hydrazine; 0.005-8.6 parts by weight of auxiliary agent; 3-60 parts by weight of filler; 6-15 parts by weight of water. The invention improves the weather resistance, UV resistance and low-temperature flexibility of the formed coating by combining styrene butadiene emulsion containing ketone carbonyl and acrylic emulsion containing hydrazine, and also improves water resistance and mechanical strength. However, the hydrophobicity of the styrene butadiene emulsion is poor, and the commercially available sericite used as filler is also non-hydrophobic, and the silane blended in the auxiliary agent can only improve the compatibility of each component, but it is difficult to directly improve the initial water resistance of the water-based coating. Therefore, the initial water resistance effect of the water-based coating is poor.

[0004] CN113372768A discloses a bottom-surface water paint for containers and a preparation method thereof, which comprises 45-55 parts of water-based acrylic emulsion, 15-25 parts of deionized water, 0.5-1 parts of antifreeze agent, 0.5-1 parts of neutralizer, 0.8-1.2 parts of dispersant, 0.05-0.15 parts of defoamer, 4-6 parts of film-forming aid, 0.05-0.15 parts of fungicide, 4-6 parts of pigment, 12-18 parts of rust-proof filler, 0.8-1.2 parts of rust-proof aid, 1.5-2.5 parts of flash rust-proof agent, 0.8-1.2 parts of wetting and leveling agent, 0.1-0.3 parts of dust-proof thixotropic agent and 0.4-0.8 parts of thickener. The bottom and surface water-based paint for containers provided by the invention has excellent adhesion on the steel plates and silicone adhesives of containers. The initial water resistance of the water-based paint reaches 240h (10d). Although it has a certain improvement compared with general commercially available products, the initial water resistance of 10 days still cannot meet construction requirements.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide an initial water-resistant coating and a preparation method and application thereof. The initial water-resistant coating adopts the Gibbs-Laguerre inlay method and the bionic method to prepare a hydrophobically modified styrene-butadiene latex grafted with an acrylic emulsion composite modified filler super-hydrophobic sericite to obtain a strong initial water resistance after the paint film is dry, thereby solving the engineering problem of blistering of the paint film when it encounters water after coating.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] In a first aspect, the present invention provides an initial water-resistant coating, wherein the initial water-resistant coating comprises, by weight:

[0009]

[0010] Preferably, the raw materials for preparing the hydrophobically modified styrene-butadiene latex include, by weight:

[0011]

[0012] Preferably, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

[0013] Preferably, the water is deoxygenated deionized water.

[0014] Preferably, the modified styrene-butadiene latex is prepared by the following steps:

[0015] (a) mixing sodium formaldehyde sulfoxylate, potassium persulfate, sodium phosphate dodecahydrate and water, and heating to obtain a first feed liquid; mixing butadiene and styrene to obtain a second feed liquid;

[0016] (b) adding the second feed liquid to the first feed liquid under stirring, mixing, and then performing a first heat preservation treatment to obtain a third feed liquid;

[0017] (c) adding tert-dodecyl mercaptan dropwise to the third feed liquid under stirring, and after the addition is complete, performing a second heat preservation treatment to obtain a fourth feed liquid;

[0018] (d) adding a silane coupling agent to the fourth liquid under stirring, performing a third heat preservation treatment, and filtering to obtain the modified styrene-butadiene latex.

[0019] Preferably, steps (a), (b) and (c) are carried out under vacuum conditions with a vacuum degree of -0.15 to -0.05 MPa; and step (d) is carried out under normal pressure conditions.

[0020] Preferably, the temperature of the heating in step (a), the temperature of the first heat preservation treatment in step (b), the temperature of the second heat preservation treatment in step (c), and the temperature of the third heat preservation treatment in step (d) are each independently selected from 40 to 60°C.

[0021] Preferably, in step (b), the first heat preservation treatment is performed for 3 to 5 hours.

[0022] Preferably, in step (c), the time for adding tert-dodecyl mercaptan dropwise is 5 to 7 hours.

[0023] Preferably, in step (c), the second heat preservation treatment is performed for 3 to 5 hours.

[0024] Preferably, in step (d), the three heat preservation treatments are performed for a period of 1 to 3 hours.

[0025] Preferably, in steps (a), (b) and (c), the stirring speed is independently 50 to 500 rpm;

[0026] Preferably, in step (d), the filtration uses a filter with a pore size of 1 to 300 μm.

[0027] Preferably, the superhydrophobic sericite has a hydrophobic contact angle of ≥150° and a rolling contact angle of ≤10°.

[0028] Preferably, the raw materials for preparing the super-hydrophobic sericite include, by weight:

[0029]

[0030]

[0031] Preferably, the silane wetting and defoaming dispersant is selected from siloxane wetting agents with a gemini structure.

[0032] Preferably, the silane wetting and defoaming dispersant is selected from any one of BYK-3480, TEGO wet 280, HY-6085 or BYK-23160, or a combination of at least two thereof.

[0033] Preferably, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

[0034] Preferably, the super-hydrophobic sericite is prepared by the following steps:

[0035] (A) mixing washed flaky sericite powder with water and grinding to obtain a first material;

[0036] (B) adding concentrated sulfuric acid to the first material under stirring conditions, and after heat preservation treatment, filtering and washing to obtain a second material;

[0037] (C) dispersing the second material in water under stirring conditions, adding a silane wetting and defoaming dispersant and a silane coupling agent, and mixing and stirring to obtain a third material;

[0038] (D) vacuum atomizing and drying the third material to obtain the super-hydrophobic sericite.

[0039] Preferably, in step (A), the mass ratio of the washed flaky sericite powder to water is (1.5-2.5):1.

[0040] Preferably, in step (A), the grinding fineness is ≤5 μm.

[0041] Preferably, in step (B), the temperature of the heat preservation treatment is 80-100° C., and the time of the heat preservation treatment is 10-20 min.

[0042] Preferably, in steps (B) and (C), the stirring speed is independently 300 to 1200 rpm.

[0043] Preferably, in step (C), the mixing and stirring time is 0.5 to 2 hours.

[0044] Preferably, in step (D), the temperature of the vacuum atomization drying is 120-130°C.

[0045] Preferably, the acrylic emulsion has a weight average molecular weight of 10,000 to 50,000, a viscosity of 100 to 1500 cps, and a solid content of 20 to 70 wt%.

[0046] Preferably, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

[0047] Preferably, the functional additive is selected from any one or a combination of at least two of a wetting and dispersing agent, a defoaming agent, a leveling agent, a thickener, a release agent, an antifreeze agent, a film-forming aid, a pH regulator and a high-gloss liquid wax.

[0048] Preferably, the initial water-resistant coating further comprises the following components:

[0049]

[0050] The wetting and dispersing agent is selected from any one of TEGO wet 270, BYK-1789, BYK-2008 or SN-4741, or a combination of at least two thereof.

[0051] Preferably, the defoaming agent is selected from silicone wetting agents with a gemini structure.

[0052] Preferably, the defoaming agent is selected from any one of BYK-3480, TEGO wet 280, HY-6085 or BYK-23160, or a combination of at least two thereof.

[0053] Preferably, the leveling agent is selected from any one of L18, BF 6333, D 510, HT 388 or FLow 3610, or a combination of at least two thereof.

[0054] Preferably, the thickener is selected from any one of an alkali swelling thickener, a nonionic associative polyurethane thickener, attapulgite, a molecular sieve or white carbon black, or a combination of at least two thereof.

[0055] Preferably, the separator is selected from lithium magnesium silicate.

[0056] Preferably, the antifreeze agent is propylene glycol.

[0057] Preferably, the film-forming aid is selected from alcohol ester dodecaned and / or dipropylene glycol butyl ether, preferably a combination of alcohol ester dodecaned and dipropylene glycol butyl ether.

[0058] Preferably, the mass ratio of the alcohol ester dodecaned to dipropylene glycol butyl ether is (0.5-2):1.

[0059] Preferably, the pH adjuster is selected from dimethylethanolamine.

[0060] Preferably, the glossiness of the high-gloss liquid wax is 85-100.

[0061] In a second aspect, the present invention provides a method for preparing the initial water-resistant coating as described in the first aspect, the preparation method comprising:

[0062] (1) mixing water, a silane coupling agent, super-hydrophobic sericite, titanium dioxide, talcum powder and a functional additive, and performing a first dispersion treatment to obtain a mixed material;

[0063] (2) Adding acrylic emulsion and hydrophobically modified styrene-butadiene latex to the mixed material under stirring, performing a second dispersion treatment, and obtaining the initial water-resistant coating.

[0064] Preferably, in step (1), the rotation speed of the primary dispersion treatment is 600 to 1000 rpm.

[0065] Preferably, the fineness of the mixed material is ≤10 μm.

[0066] Preferably, in step (1), the mixed material is prepared by the following steps:

[0067] After mixing water, antifreeze agent and film-forming aid, add pH adjuster and isolation agent in sequence under stirring at a rotation speed of 600-1000 rpm, disperse at a rotation speed of 600-1000 rpm for 20-40 minutes, then add wetting dispersant, defoamer, leveling agent, silane coupling agent, thickener, superhydrophobic sericite, titanium dioxide, talcum powder and high gloss liquid wax in sequence, disperse at a rotation speed of 600-1000 rpm for 20-40 minutes to obtain a mixed material.

[0068] Preferably, in step (2), the rotation speed of the second dispersion treatment is ≤500 rpm.

[0069] Preferably, the second dispersion treatment lasts for 5 to 60 minutes.

[0070] Preferably, during the second dispersion treatment, the temperature of the material is controlled below 40°C.

[0071] In a third aspect, the present invention provides a use of the initial water-resistant coating as described in the first aspect in preparing coatings for containers, vehicles, ships, engineering machinery or military equipment.

[0072] Compared with the prior art, the present invention has the following beneficial effects:

[0073] (1) The paint film formed by the coating of the present invention has excellent water resistance in the initial stage;

[0074] (2) The coating of the present invention can be prepared on site and is safe and convenient to use; it solves the problem of poor initial water resistance of the paint film, which leads to blistering and rework of the paint film;

[0075] (3) The coating of the present invention has excellent performance, high tensile strength, aging resistance and excellent water resistance;

[0076] (4) The coating of the present invention has strong self-healing ability and can self-repair punctured holes, and the waterproof quality is guaranteed;

[0077] (5) The coating of the present invention has excellent water resistance and UV resistance, can be used in the range of -50 to 88°C, and has a service life of up to 20 years;

[0078] (6) The coating of the present invention is crack-resistant and freeze-resistant, has good elasticity at low temperatures, and has good adhesion without falling off or peeling. DETAILED DESCRIPTION

[0079] Unless otherwise defined herein, scientific and technological 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.

[0080] 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.

[0081] 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.

[0082] In a first aspect, the present invention provides an initial water-resistant coating, wherein the initial water-resistant coating comprises, by weight:

[0083]

[0084] In the present invention, the composite technology of bionic hydrophobic and nano-hydrophobic principles and Gibbs-Laguerre embedding method is adopted to solve the problem that the initial water resistance effect of a single principle is not ideal; at the same time, the molecular entanglement technology is used to rapidly spatially network the hydrophobically modified styrene butadiene latex and acrylic emulsion under the action of a film-forming aid to form a dense film, thereby enhancing the initial water resistance of the paint film and solving the problem that the paint film is not water-resistant in the initial stage.

[0085] As an optional embodiment, in the initial water-resistant coating, the content of acrylic emulsion is 25 to 95 parts, for example, it can be 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts, etc., preferably 40 to 60 parts.

[0086] As an optional embodiment, in the initial water-resistant coating, the content of hydrophobically modified styrene butadiene latex is 5 to 75 parts, for example, it can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, etc., preferably 40 to 60 parts.

[0087] As an optional embodiment, in the initial water-resistant coating, the water content is 10 to 30 parts, for example, it can be 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, etc.

[0088] As an optional embodiment, in the initial water-resistant coating, the content of the silane coupling agent is 3 to 8 parts, for example, it can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, etc.

[0089] As an optional embodiment, in the initial water-resistant coating, the content of superhydrophobic sericite is 80 to 120 parts, for example, it can be 80 parts, 82 parts, 84 parts, 85 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 95 parts, 96 parts, 98 parts, 100 parts, 102 parts, 104 parts, 105 parts, 106 parts, 108 parts, 110 parts, 112 parts, 114 parts, 115 parts, 116 parts, 118 parts, 120 parts, etc.

[0090] As an optional embodiment, in the initial water-resistant coating, the content of titanium dioxide is 10 to 30 parts, for example, it can be 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, etc.

[0091] As an optional embodiment, in the initial water-resistant coating, the content of talc is 20 to 40 parts, for example, it can be 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts, 40 parts, etc.

[0092] As an optional embodiment, in the initial water-resistant coating, the content of the functional additive is 1 to 30 parts, for example, it can be 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc.

[0093] As an optional embodiment, the raw materials for preparing the hydrophobically modified styrene-butadiene latex include, by weight:

[0094]

[0095] In the present invention, a grafting method is used to graft hydrophobic groups on butadiene styrene, such as alkyl and / or fluorine groups, so as to improve the hydrophobic modification of the latex; further, the hydrophobically modified butadiene styrene latex is entangled with the acrylic acid molecules in the coating raw materials during film formation, and under the action of the film-forming aid, a dense spatial network structure is quickly formed, and nano-hydrophobic fillers are adsorbed to form a dense hydrophobic film.

[0096] As an optional embodiment, in the preparation raw material of the hydrophobically modified styrene butadiene latex, the content of butadiene is 60 to 80 parts, for example, it can be 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, etc.

[0097] As an optional embodiment, in the preparation raw material of the hydrophobically modified styrene butadiene latex, the content of styrene is 20 to 40 parts, for example, it can be 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts, 40 parts, etc.

[0098] As an optional embodiment, in the preparation raw material of the hydrophobically modified styrene butadiene latex, the content of tert-dodecyl mercaptan is 0.05 to 0.5 parts, for example, it can be 0.05 parts, 0.06 parts, 0.08 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, etc.

[0099] As an optional embodiment, in the preparation raw materials of the hydrophobically modified styrene butadiene latex, the content of sodium formaldehyde sulfoxylate is 0.1 to 0.2 parts, for example, it can be 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, 0.2 parts, etc.

[0100] As an optional embodiment, in the preparation raw material of the hydrophobically modified styrene butadiene latex, the content of potassium persulfate is 0.1 to 0.3 parts, for example, it can be 0.1 parts, 0.12 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.18 parts, 0.2 parts, 0.22 parts, 0.24 parts, 0.25 parts, 0.26 parts, 0.28 parts, 0.3 parts, etc.

[0101] As an optional embodiment, in the raw materials for preparing the hydrophobically modified styrene butadiene latex, the content of sodium phosphate dodecahydrate is 0.5 to 1.0 parts, for example, it can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, etc.

[0102] As an optional embodiment, in the preparation raw material of the hydrophobically modified styrene butadiene latex, the content of the silane coupling agent is 1 to 5 parts, for example, it can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.

[0103] As an optional embodiment, in the preparation raw material of the hydrophobically modified styrene butadiene latex, the water content is 40 to 60 parts, for example, it can be 40 parts, 42 parts, 44 parts, 45 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts, 55 parts, 56 parts, 58 parts, 60 parts, etc.

[0104] As an optional embodiment, in the preparation raw materials of the hydrophobically modified styrene-butadiene latex, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

[0105] As an optional embodiment, in the raw material for preparing the hydrophobically modified styrene butadiene latex, the water is deoxygenated deionized water.

[0106] As an optional embodiment, the modified styrene-butadiene latex is prepared by the following steps:

[0107] (a) mixing sodium formaldehyde sulfoxylate, potassium persulfate, sodium phosphate dodecahydrate and water, and heating to obtain a first feed liquid; mixing butadiene and styrene to obtain a second feed liquid;

[0108] (b) adding the second feed liquid to the first feed liquid under stirring, mixing, and then performing a first heat preservation treatment to obtain a third feed liquid;

[0109] (c) adding tert-dodecyl mercaptan dropwise to the third feed liquid under stirring, and after the addition is complete, performing a second heat preservation treatment to obtain a fourth feed liquid;

[0110] (d) adding a silane coupling agent to the fourth liquid under stirring, performing a third heat preservation treatment, and filtering to obtain the modified styrene-butadiene latex.

[0111] As an optional embodiment, steps (a), (b) and (c) are carried out under vacuum conditions with a vacuum degree of -0.15 to -0.05 MPa, for example, -0.15 MPa, -0.14 MPa, -0.12 MPa, -0.1 MPa, -0.08 MPa, -0.06 MPa, -0.05 MPa, etc.

[0112] As an optional embodiment, step (d) is carried out under normal pressure.

[0113] As an optional embodiment, the heating temperature in step (a) is 40-60°C, for example, it can be 40°C, 42°C, 44°C, 45°C, 46°C, 48°C, 50°C, 52°C, 54°C, 55°C, 56°C, 58°C, 60°C, etc.

[0114] As an optional embodiment, the temperature of the first insulation treatment in step (b) is 40-60°C, for example, it can be 40°C, 42°C, 44°C, 45°C, 46°C, 48°C, 50°C, 52°C, 54°C, 55°C, 56°C, 58°C, 60°C, etc.

[0115] As an optional embodiment, the temperature of the second insulation treatment in step (c) is 40-60°C, for example, it can be 40°C, 42°C, 44°C, 45°C, 46°C, 48°C, 50°C, 52°C, 54°C, 55°C, 56°C, 58°C, 60°C, etc.

[0116] As an optional embodiment, the temperature of the third insulation treatment in step (d) is 40-60°C, for example, it can be 40°C, 42°C, 44°C, 45°C, 46°C, 48°C, 50°C, 52°C, 54°C, 55°C, 56°C, 58°C, 60°C, etc.

[0117] As an optional embodiment, in step (b), the time of the first insulation treatment is 3 to 5 hours, for example, it can be 3h, 3.2h, 3.4h, 3.5h, 3.6h, 3.8h, 4h, 4.2h, 4.4h, 4.5h, 4.6h, 4.8h, 5h, etc.

[0118] As an optional embodiment, in step (c), the time for adding tert-dodecyl mercaptan is 5 to 7 hours, for example, it can be 5 hours, 5.2 hours, 5.4 hours, 5.5 hours, 3.6 hours, 5.8 hours, 6 hours, 6.2 hours, 6.4 hours, 6.5 hours, 6.6 hours, 6.8 hours, 7 hours, etc.

[0119] As an optional embodiment, in step (c), the time of the second insulation treatment is 3 to 5 hours, for example, it can be 3h, 3.2h, 3.4h, 3.5h, 3.6h, 3.8h, 4h, 4.2h, 4.4h, 4.5h, 4.6h, 4.8h, 5h, etc.

[0120] As an optional embodiment, in step (d), the time of the three insulation treatments is 1 to 3 hours, for example, it can be 1h, 1.2h, 1.4h, 1.5h, 1.6h, 1.8h, 2h, 2.2h, 2.4h, 2.5h, 2.6h, 2.8h, 3h, etc.

[0121] As an optional embodiment, in step (a), the stirring speed is 50-500 rpm, for example, it can be 50 rpm, 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, 450 rpm, 500 rpm, etc.

[0122] As an optional embodiment, in step (b), the stirring speed is 50-500 rpm, for example, it can be 50 rpm, 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, 450 rpm, 500 rpm, etc.

[0123] As an optional embodiment, in step (c), the stirring speed is 50-500 rpm, for example, it can be 50 rpm, 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, 450 rpm, 500 rpm, etc.

[0124] As an optional embodiment, in step (d), the filtration uses a filter with a pore size of 1 to 300 μm. The pore size of the filter can be, for example, 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 80 μm, 100 μm, 120 μm, 150 μm, 160 μm, 180 μm, 200 μm, 220 μm, 240 μm, 250 μm, 280 μm, 300 μm, etc.

[0125] As an optional embodiment, the hydrophobic contact angle of the superhydrophobic sericite is ≥150°, for example, it can be 150°, 151°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°, etc.

[0126] As an optional embodiment, the rolling contact angle of the superhydrophobic sericite is ≤10°, for example, it can be 10°, 9°, 8°, 7°, 6°, 5°, 4°, 3°, 2°, 1°, etc.

[0127] As an optional embodiment, the raw materials for preparing the super hydrophobic sericite include, by weight:

[0128]

[0129] In the present invention, the washed flaky sericite powder is modified by using the bionic hydrophobic and nano-hydrophobic principles and the Gibbs-Laguerre inlay method. First, an acid corrosion method is used to imitate the surface structure of lotus leaves, and etching is performed on the surface of the powder particles to obtain a nano honeycomb, thereby producing an air cushion hydrophobic effect. At the same time, the particle size is nanosized to obtain a nano-hydrophobic effect. Further, silane modification is used to graft a hydrophobic base on the surface of the mica sheet to imitate the air cushion hydrophobic structure of the hair on the foot of a water spider; at the same time, the flaky mica imitates the arrangement of fish scales, and a variety of hydrophobic technologies are combined to obtain a super hydrophobic material.

[0130] As an optional embodiment, in the preparation raw material of the superhydrophobic sericite, the content of washed flaky sericite powder is 80 to 120 parts, for example, it can be 80 parts, 82 parts, 84 parts, 85 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 95 parts, 96 parts, 98 parts, 100 parts, 102 parts, 104 parts, 105 parts, 106 parts, 108 parts, 110 parts, 112 parts, 114 parts, 115 parts, 116 parts, 118 parts, 120 parts, etc.

[0131] As an optional embodiment, in the preparation raw material of the superhydrophobic sericite, the water content is 80-120 parts, for example, it can be 80 parts, 82 parts, 84 parts, 85 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 95 parts, 96 parts, 98 parts, 100 parts, 102 parts, 104 parts, 105 parts, 106 parts, 108 parts, 110 parts, 112 parts, 114 parts, 115 parts, 116 parts, 118 parts, 120 parts, etc.

[0132] As an optional embodiment, in the preparation raw material of the superhydrophobic sericite, the content of concentrated sulfuric acid is 80-120 parts, for example, it can be 80 parts, 82 parts, 84 parts, 85 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 95 parts, 96 parts, 98 parts, 100 parts, 102 parts, 104 parts, 105 parts, 106 parts, 108 parts, 110 parts, 112 parts, 114 parts, 115 parts, 116 parts, 118 parts, 120 parts, etc.

[0133] As an optional embodiment, in the preparation raw material of the superhydrophobic sericite, the content of the silane wetting and defoaming dispersant 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.

[0134] As an optional embodiment, in the preparation raw material of the superhydrophobic sericite, the content of the silane coupling agent is 3 to 8 parts, for example, it can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, etc.

[0135] As an optional embodiment, in the raw material for preparing the superhydrophobic sericite, the silane wetting and defoaming dispersant is selected from siloxane wetting agents with a gemini structure.

[0136] As an optional embodiment, in the raw material for preparing the superhydrophobic sericite, the silane wetting and defoaming dispersant is selected from any one of BYK-3480, TEGO wet 280, HY-6085 or BYK-23160, or a combination of at least two thereof.

[0137] As an optional embodiment, in the preparation raw material of the superhydrophobic sericite, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

[0138] As an optional embodiment, the super-hydrophobic sericite is prepared by the following steps:

[0139] (A) mixing washed flaky sericite powder with water and grinding to obtain a first material;

[0140] (B) adding concentrated sulfuric acid to the first material under stirring conditions, and after heat preservation treatment, filtering and washing to obtain a second material;

[0141] (C) dispersing the second material in water under stirring conditions, adding a silane wetting and defoaming dispersant and a silane coupling agent, and mixing and stirring to obtain a third material;

[0142] (D) vacuum atomizing and drying the third material to obtain the super-hydrophobic sericite.

[0143] As an optional embodiment, in step (A), the mass ratio of the washed flaky sericite powder and water is (1.5-2.5):1, for example, it can be 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.2:1, 2.4:1, 2.5:1, etc.

[0144] As an optional embodiment, in step (A), the grinding fineness is ≤5μm, for example, it can be 5μm, 4μm, 3μm, 2μm, 1μm, 900nm, 800nm, 700nm, 600nm, 500nm, 400nm, 300nm, 200nm, 100nm, etc.

[0145] As an optional embodiment, in step (B), the temperature of the insulation treatment is 80-100°C, for example, it can be 80°C, 82°C, 84°C, 85°C, 86°C, 88°C, 90°C, 92°C, 94°C, 95°C, 96°C, 98°C, 100°C, etc., and the time of the insulation treatment is 10-20min, for example, it can be 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min, 20min, etc.

[0146] As an optional embodiment, in step (B), the stirring speed is 300-1200 rpm, for example, it can be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm, 1000 rpm, 1100 rpm, 1200 rpm, etc.

[0147] As an optional embodiment, in step (C), the stirring speed is 300-1200 rpm, for example, it can be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm, 1000 rpm, 1100 rpm, 1200 rpm, etc.

[0148] As an optional embodiment, in step (C), the mixing and stirring time is 0.5 to 2 h, for example, it can be 0.5 h, 0.6 h, 0.8 h, 1 h, 1.2 h, 1.4 h, 1.5 h, 1.6 h, 1.8 h, 2 h, etc.

[0149] As an optional embodiment, in step (D), the temperature of the vacuum atomization drying is 120-130°C, for example, it can be 120°C, 121°C, 122°C, 123°C, 124°C, 125°C, 126°C, 127°C, 128°C, 129°C, 130°C, etc.

[0150] As an optional embodiment, in the initial water-resistant coating, the weight-average molecular weight of the acrylic emulsion is 10,000 to 50,000, for example, 10,000, 15,000, 20,000, 25,000, 30,000, 35,000, 40,000, 45,000, 50,000, etc., the viscosity is 100 to 1500 cps, for example, 100 cps, 200 cps, 300 cps, 400 cps, 500 cps, 600 cps, 700 cps, 800 cps, 900 cps, 1000 cps, 1100 cps, 1200 cps, 1300 cps, 1400 cps, 1500 cps, etc., and the solid content is 20 to 70 wt%, for example, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, etc.

[0151] As an optional embodiment, in the initial water-resistant coating, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

[0152] As an optional embodiment, in the initial water-resistant coating, the functional additive is selected from any one or a combination of at least two of a wetting and dispersing agent, a defoaming agent, a leveling agent, a thickener, a release agent, an antifreeze agent, a film-forming aid, a pH adjuster and a high-gloss liquid wax.

[0153] As an optional embodiment, the initial water-resistant coating further comprises the following components:

[0154]

[0155] As an optional embodiment, in the initial water-resistant coating, the content of the wetting and dispersing agent is 0.5 to 2 parts, for example, it can be 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0156] As an optional embodiment, in the initial water-resistant coating, the content of the defoaming agent is 0.5 to 2 parts, for example, it can be 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0157] As an optional embodiment, in the initial water-resistant coating, the content of the leveling agent is 0.5 to 2 parts, for example, it can be 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0158] As an optional embodiment, in the initial water-resistant coating, the content of the thickener is 0.5 to 2 parts, for example, it can be 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0159] As an optional embodiment, in the initial water-resistant coating, the content of the release agent is 0.1 to 1 part, for example, it can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, etc.

[0160] As an optional embodiment, in the initial water-resistant coating, the content of antifreeze agent is 3 to 8 parts, for example, it can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, etc.

[0161] As an optional embodiment, in the initial water-resistant coating, the content of the film-forming aid 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.

[0162] As an optional embodiment, in the initial water-resistant coating, the content of the pH adjuster is 0.5 to 2 parts, for example, it can be 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0163] As an optional embodiment, in the initial water-resistant coating, the content of high-gloss liquid wax is 0.5 to 2 parts, for example, it can be 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc.

[0164] As an optional embodiment, in the initial water-resistant coating, the wetting and dispersing agent is selected from any one of TEGO wet270, BYK-1789, BYK-2008 or SN-4741, or a combination of at least two thereof.

[0165] As an optional embodiment, in the initial water-resistant coating, the defoaming agent is selected from silicone wetting agents with a gemini structure.

[0166] As an optional embodiment, in the initial water-resistant coating, the defoamer is selected from any one of BYK-3480, TEG Owet 280, HY-6085 or BYK-23160, or a combination of at least two thereof.

[0167] As an optional embodiment, in the initial water-resistant coating, the leveling agent is selected from any one of L18, BF 6333, D510, HT 388 or FLow 3610, or a combination of at least two thereof.

[0168] As an optional embodiment, in the initial water-resistant coating, the thickener is selected from any one of an alkali swelling thickener, a nonionic associative polyurethane thickener, attapulgite, a molecular sieve or white carbon black, or a combination of at least two thereof.

[0169] As an optional embodiment, in the initial water-resistant coating, the isolation agent is selected from lithium magnesium silicate.

[0170] As an optional embodiment, in the initial water-resistant coating, the antifreeze agent is propylene glycol.

[0171] As an optional embodiment, in the initial water-resistant coating, the film-forming aid is selected from alcohol ester dodecaned and / or dipropylene glycol butyl ether, preferably a combination of alcohol ester dodecaned and dipropylene glycol butyl ether.

[0172] As an optional embodiment, in the initial water-resistant coating, the mass ratio of the alcohol ester dodecaned and dipropylene glycol butyl ether is (0.5-2):1, for example, it can be 0.5:1, 0.6:1, 0.8:1, 1:1, 1.2:1, 1.4:1, 1.5:1, 1.6:1, 1.8:1, 2:1, etc.

[0173] As an optional embodiment, in the initial water-resistant coating, the content of the alcohol ester dodeca is 2.5 to 7.5 parts, for example, it can be 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, etc.

[0174] As an optional embodiment, in the initial water-resistant coating, the content of dipropylene glycol butyl ether is 2.5 to 7.5 parts, for example, it can be 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, etc.

[0175] As an optional embodiment, in the initial water-resistant coating, the pH adjuster is selected from dimethylethanolamine.

[0176] As an optional embodiment, in the initial water-resistant coating, the glossiness of the high-gloss liquid wax is 85-100, for example, it can be 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, etc.

[0177] In a second aspect, the present invention provides a method for preparing the initial water-resistant coating as described in the first aspect, the preparation method comprising:

[0178] (1) mixing water, a silane coupling agent, super-hydrophobic sericite, titanium dioxide, talcum powder and a functional additive, and performing a first dispersion treatment to obtain a mixed material;

[0179] (2) Adding acrylic emulsion and hydrophobically modified styrene-butadiene latex to the mixed material under stirring, performing a second dispersion treatment, and obtaining the initial water-resistant coating.

[0180] As an optional embodiment, in step (1), the rotation speed of the primary dispersion treatment is 600-1000 rpm, for example, it can be 600 rpm, 650 rpm, 700 rpm, 750 rpm, 800 rpm, 850 rpm, 900 rpm, 950 rpm, 1000 rpm, etc.

[0181] As an optional embodiment, in step (1), the fineness of the mixed material is ≤10 μm, for example, it can be 10 μm, 9 μm, 8 μm, 7 μm, 6 μm, 5 μm, 4 μm, 3 μm, 2 μm, 1 μm, etc.

[0182] As an optional embodiment, in step (1), the mixed material is prepared by the following steps:

[0183] After mixing water, antifreeze agent and film-forming aid, add pH adjuster and isolation agent in sequence under stirring at a rotation speed of 600-1000 rpm, disperse at a rotation speed of 600-1000 rpm for 20-40 minutes, then add wetting dispersant, defoamer, leveling agent, silane coupling agent, thickener, superhydrophobic sericite, titanium dioxide, talcum powder and high gloss liquid wax in sequence, disperse at a rotation speed of 600-1000 rpm for 20-40 minutes to obtain a mixed material.

[0184] As an optional embodiment, in step (2), the rotation speed of the second dispersion treatment is ≤500rpm, for example, it can be 500rpm, 450rpm, 400rpm, 350rpm, 300rpm, 250rpm, 200rpm, 150rpm, 100rpm, 50rpm, etc.

[0185] As an optional embodiment, in step (2), the time for the second dispersion treatment is 5 to 60 min, for example, it can be 5 min, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, etc.

[0186] As an optional embodiment, in step (2), during the second dispersion treatment, the temperature of the material is controlled below 40°C.

[0187] In a third aspect, the present invention provides a use of the initial water-resistant coating as described in the first aspect in preparing coatings for containers, vehicles, ships, engineering machinery or military equipment.

[0188] 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.

[0189] The sources of the following raw materials are as follows:

[0190]

[0191] Preparation Example 1

[0192] This preparation example provides a hydrophobically modified styrene butadiene latex, which is prepared by the following steps:

[0193] (a) evacuating a container to a vacuum degree of -0.1 MPa, uniformly mixing 0.15 parts of sodium formaldehyde sulfoxylate, 0.2 parts of potassium persulfate, 0.8 parts of sodium phosphate dodecahydrate, and 50 parts of deoxygenated deionized water, adding the mixture to the vacuum container, and heating the mixture to 50° C. to obtain a first feed liquid; mixing 70 parts of butadiene and 30 parts of styrene to obtain a second feed liquid;

[0194] (b) adding the second feed liquid to the vacuum container containing the first feed liquid under stirring at a speed of 150 rpm, mixing evenly, and keeping warm at 50° C. for 4 hours to obtain a third feed liquid;

[0195] (c) adding 0.2 parts of tert-dodecyl mercaptan to the vacuum container containing the third feed liquid under stirring at a speed of 500 rpm for 6 hours. After the addition is completed, the mixture is kept at 50° C. for 4 hours to obtain a fourth feed liquid;

[0196] (d) stopping the vacuuming and restoring the pressure to normal pressure, and dropping 3 parts of (3-epoxypropoxy)propyltrimethoxysilane into the container containing the fourth liquid. After the dropping is completed, the mixture is kept at 50° C. for 2 h, and filtered through a filter with a pore size of 10 μm to obtain the hydrophobically modified styrene-butadiene latex.

[0197] Preparation Example 2

[0198] This preparation example provides a hydrophobically modified styrene butadiene latex, which is prepared by the following steps:

[0199] (a) evacuating a container to a vacuum degree of -0.1 MPa, uniformly mixing 0.15 parts of sodium formaldehyde sulfoxylate, 0.2 parts of potassium persulfate, 0.8 parts of sodium phosphate dodecahydrate, and 50 parts of deoxygenated deionized water, adding the mixture to the vacuum container, and heating the mixture to 50° C. to obtain a first feed liquid; mixing 70 parts of butadiene and 30 parts of styrene to obtain a second feed liquid;

[0200] (b) adding the second feed liquid to the vacuum container containing the first feed liquid under stirring at a speed of 150 rpm, mixing evenly, and keeping warm at 50° C. for 4 hours to obtain a third feed liquid;

[0201] (c) adding 0.2 parts of tert-dodecyl mercaptan to the vacuum container containing the third feed liquid under stirring at a speed of 500 rpm for 6 hours. After the addition is completed, the mixture is kept at 50° C. for 4 hours to obtain a fourth feed liquid;

[0202] (d) stopping the vacuuming and restoring the pressure to normal pressure, and dropping 3 parts of dodecyltrimethoxysilane into the container containing the fourth liquid. After the dropping is completed, the mixture is kept at 50° C. for 2 h, and filtered through a filter with a pore size of 80 μm to obtain the hydrophobically modified styrene-butadiene latex.

[0203] Preparation Example 3

[0204] This preparation example provides a hydrophobically modified styrene butadiene latex, which is prepared by the following steps:

[0205] (a) evacuating a container to a vacuum degree of -0.1 MPa, uniformly mixing 0.15 parts of sodium formaldehyde sulfoxylate, 0.2 parts of potassium persulfate, 0.8 parts of sodium phosphate dodecahydrate, and 50 parts of deoxygenated deionized water, adding the mixture to the vacuum container, and heating the mixture to 50° C. to obtain a first feed liquid; mixing 70 parts of butadiene and 30 parts of styrene to obtain a second feed liquid;

[0206] (b) adding the second feed liquid to the vacuum container containing the first feed liquid under stirring at a speed of 150 rpm, mixing evenly, and keeping warm at 50° C. for 4 hours to obtain a third feed liquid;

[0207] (c) adding 0.2 parts of tert-dodecyl mercaptan to the vacuum container containing the third feed liquid under stirring at a speed of 500 rpm for 6 hours. After the addition is completed, the mixture is kept at 50° C. for 4 hours to obtain a fourth feed liquid;

[0208] (d) stopping the vacuuming and restoring the pressure to normal pressure, and dropping 2 parts of tetradecyltrimethoxysilane and 1 part of trifluoropropylmethyldiethoxysilane into the container containing the fourth liquid. After the dropping is completed, the mixture is kept at 50° C. for 2 h, and filtered through a filter with a pore size of 80 μm to obtain the hydrophobically modified styrene-butadiene latex.

[0209] Preparation Example 4

[0210] This preparation example provides a hydrophobically modified styrene-butadiene latex, which is different from Preparation Example 1 only in that after the dropwise addition of step (d), the latex is kept at 30° C. for 6 hours, and the other steps are exactly the same as Preparation Example 1.

[0211] Preparation Example 5

[0212] This preparation example provides a hydrophobically modified styrene-butadiene latex, which differs from Preparation Example 1 only in that after the dropwise addition of step (d), the latex is kept at 70° C. for 30 min, and the other steps are exactly the same as those of Preparation Example 1.

[0213] Preparation Example 6

[0214] This preparation example provides a super-hydrophobic sericite mica, which is prepared by the following steps:

[0215] (A) mixing 100 parts of washed flaky sericite powder and 50 parts of deionized water, and grinding them with a grinder to obtain a first material with a fineness of ≤5 μm;

[0216] (B) adding 100 parts of concentrated sulfuric acid (98 wt%) to the first material while stirring at a speed of 500 rpm, heating to 90° C., keeping the temperature for 15 min, filtering, and washing with deionized water for 3 times to obtain a second material;

[0217] (C) adding the second material to 50 parts of water under stirring at a speed of 500 rpm, adding 10 parts of silane wetting and defoaming dispersant and 5 parts of (3-epoxypropoxy)propyltrimethoxysilane under stirring at a speed of 1200 rpm, and mixing at room temperature for 1 hour to obtain a third material;

[0218] (D) The third substance is vacuum-atomized and dried at 125° C. to obtain super-hydrophobic sericite with a particle size of 5 μm, a hydrophobic contact angle of 150°, and a rolling contact angle of 10°.

[0219] Preparation Example 7

[0220] This preparation example provides a super-hydrophobic sericite mica, which is prepared by the following steps:

[0221] (A) mixing 100 parts of washed flaky sericite powder and 50 parts of deionized water, and grinding them with a grinder to obtain a first material with a fineness of ≤5 μm;

[0222] (B) adding 100 parts of concentrated sulfuric acid (98 wt%) to the first material while stirring at a speed of 500 rpm, heating to 90° C., keeping the temperature for 15 min, filtering, and washing with deionized water for 3 times to obtain a second material;

[0223] (C) adding the second material to 50 parts of water under stirring at a speed of 500 rpm, adding 10 parts of a silane wetting and defoaming dispersant and 5 parts of hexadecyltrimethoxysilane under stirring at a speed of 1200 rpm, and mixing at room temperature for 1 hour to obtain a third material;

[0224] (D) The third substance is vacuum-atomized and dried at 125° C. to obtain super-hydrophobic sericite with a particle size of 5 μm, a hydrophobic contact angle of 152°, and a rolling contact angle of 8°.

[0225] Preparation Example 8

[0226] This preparation example provides a super-hydrophobic sericite mica, which is prepared by the following steps:

[0227] (A) mixing 100 parts of washed flaky sericite powder and 50 parts of deionized water, and grinding them with a grinder to obtain a first material with a fineness of ≤5 μm;

[0228] (B) adding 100 parts of concentrated sulfuric acid (98 wt%) to the first material while stirring at a speed of 500 rpm, heating to 90° C., keeping the temperature for 15 min, filtering, and washing with deionized water for 3 times to obtain a second material;

[0229] (C) adding the second material to 50 parts of water under stirring at a speed of 500 rpm, adding 10 parts of silane wetting and defoaming dispersant, 2 parts of tetradecyltrimethoxysilane and 3 parts of trifluoropropylmethyldimethoxysilane under stirring at a speed of 1200 rpm, and mixing at room temperature for 1 hour to obtain a third material;

[0230] (D) The third substance is vacuum-atomized and dried at 125° C. to obtain super-hydrophobic sericite with a particle size of 10 μm, a hydrophobic contact angle of 155°, and a rolling contact angle of 7°.

[0231] Preparation Example 9

[0232] This preparation example provides a super-hydrophobic sericite mica, which differs from Preparation Example 6 only in that step (B) is heated to 70°C and kept warm for 30 minutes, and the other steps are exactly the same as Preparation Example 6.

[0233] Preparation Example 10

[0234] This preparation example provides a super-hydrophobic sericite mica, which differs from Preparation Example 6 only in that step (C) is mixed at 50°C for 30 minutes, and the other steps are exactly the same as Preparation Example 6.

[0235] Comparative Preparation Example 1

[0236] This comparative preparation example provides a modified styrene butadiene latex, which differs from Preparation Example 1 only in that step (d) is no longer performed, and the fourth liquid is directly filtered after being obtained to obtain the modified styrene butadiene latex, and the other steps are exactly the same as Preparation Example 1.

[0237] Comparative Preparation Example 2

[0238] This comparative preparation example provides a superhydrophobic sericite, which differs from Preparation Example 6 only in that step (B) is no longer performed, and after obtaining the first material, it is directly added to 50 parts of water and step (C) is performed. The other steps are exactly the same as Preparation Example 6.

[0239] Comparative Preparation Example 3

[0240] This comparative preparation example provides a superhydrophobic sericite, which differs from Preparation Example 6 only in that step (C) is no longer performed, and step (D) is directly performed after obtaining the second material. The other steps are exactly the same as Preparation Example 6.

[0241] Embodiments 1 to 5

[0242] Examples 1 to 5 provide five initial water-resistant coatings with different proportions. The initial water-resistant coatings in each example include the following components in parts by weight:

[0243]

[0244]

[0245] The initial water-resistant coating is prepared by the following steps:

[0246] (1) Add water, propylene glycol, alcohol ester 12, and dipropylene glycol butyl ether to a container according to the proportions of the above embodiments, add dimethylethanolamine and lithium magnesium silicate in sequence under stirring at a speed of 450 rpm, and disperse at a high speed of 800 rpm for 30 min, then add a wetting dispersant, a defoamer, a leveling agent, a silane coupling agent, a thickener, and the super-hydrophobic sericite, titanium dioxide, talc, and high-gloss liquid wax provided in Preparation Example 6 in sequence, disperse at a high speed of 800 rpm for 30 min, and grind the mixed material to a fineness of ≤10 μm to obtain a mixed material;

[0247] (2) Adding acrylic emulsion and the hydrophobically modified styrene-butadiene latex provided in Preparation Example 1 to the mixture under stirring at a speed of 650 rpm, dispersing at a low speed of 500 rpm for 30 min to mix evenly, and controlling the material temperature below 40° C. to obtain the initial water-resistant coating of the corresponding embodiment.

[0248] Example 6

[0249] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 1 is replaced by the hydrophobically modified styrene butadiene latex provided in Preparation Example 2, and the contents of other components are exactly the same as those in Example 2.

[0250] Example 7

[0251] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 1 is replaced by the hydrophobically modified styrene butadiene latex provided in Preparation Example 3, and the contents of other components are exactly the same as those in Example 2.

[0252] Example 8

[0253] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 1 is replaced by the hydrophobically modified styrene butadiene latex provided in Preparation Example 4, and the contents of other components are exactly the same as those in Example 2.

[0254] Example 9

[0255] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 1 is replaced by the hydrophobically modified styrene butadiene latex provided in Preparation Example 5, and the contents of other components are exactly the same as those in Example 2.

[0256] Example 10

[0257] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 6 is replaced by the super-hydrophobic sericite provided in Preparation Example 7, and the contents of other components are exactly the same as those in Example 2.

[0258] Embodiment 11

[0259] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 6 is replaced by the super-hydrophobic sericite provided in Preparation Example 8, and the contents of other components are exactly the same as those in Example 2.

[0260] Example 12

[0261] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 6 is replaced by the super-hydrophobic sericite provided in Preparation Example 9, and the contents of other components are exactly the same as in Example 2.

[0262] Example 13

[0263] This embodiment provides an initial water-resistant coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 6 is replaced by the super-hydrophobic sericite provided in Preparation Example 10, and the contents of other components are exactly the same as those in Example 2.

[0264] Comparative Example 1

[0265] This comparative example provides a coating, which differs from Example 2 only in that the hydrophobically modified styrene-butadiene latex provided in Preparation Example 1 is not added, the acrylic emulsion content is increased to 100 parts, and the super-hydrophobic sericite provided in Preparation Example 6 is no longer added, and the contents of other components are exactly the same as in Example 2.

[0266] Comparative Example 2

[0267] This comparative example provides a coating, which is different from Example 2 only in that the content of the hydrophobically modified styrene-butadiene latex provided in Preparation Example 1 is reduced to 5 parts, the content of the acrylic emulsion is increased to 95 parts, and the contents of other components are exactly the same as those in Example 2.

[0268] Comparative Example 3

[0269] This comparative example provides a coating, which is different from Example 2 only in that the super-hydrophobic sericite provided in Preparation Example 6 is no longer added, and the contents of other components are exactly the same as those in Example 2.

[0270] Comparative Example 4

[0271] This comparative example provides a coating, which differs from Example 2 only in that the hydrophobically modified styrene butadiene latex provided in Preparation Example 1 is replaced with an equal mass of modified styrene butadiene latex provided in Comparative Preparation Example 1, and the contents of other components are exactly the same as those in Example 2.

[0272] Comparative Example 5

[0273] This comparative example provides a coating, which differs from Example 2 only in that the super-hydrophobic sericite provided in Preparation Example 6 is replaced by an equal mass of super-hydrophobic sericite provided in Comparative Preparation Example 2, and the contents of other components are exactly the same as those in Example 2.

[0274] Comparative Example 6

[0275] This comparative example provides a coating, which differs from Example 2 only in that the super-hydrophobic sericite provided in Preparation Example 6 is replaced by an equal mass of super-hydrophobic sericite provided in Comparative Preparation Example 3, and the contents of other components are exactly the same as those in Example 2.

[0276] Test Example 1

[0277] Test samples: initial water-resistant coatings provided in Examples 1 to 13, coatings provided in Comparative Examples 1 to 6, and commercially available samples (Huabao HB-1-2D);

[0278] Test method implementation standards: JT / T810 container coatings, JH / E06 container coatings, HG / T4570 automotive water-based coatings;

[0279] The test results are shown in Table 1 and Table 2:

[0280] Table 1

[0281]

[0282]

[0283] Table 2

[0284]

[0285]

[0286] As shown in Table 1 and Table 2, the present invention obtains a coating with excellent initial water resistance; it can be prepared on the construction site and is safe and convenient to use; it solves the problem of poor initial water resistance of the paint film, which leads to blistering and rework of the paint film; it has excellent mechanical properties, high tensile strength, aging resistance, and excellent waterproofness; it has strong self-healing ability, can self-repair punctured holes, and the waterproof quality is guaranteed; it has excellent water and UV resistance, can be used at -50 to 88°C, and has a service life of up to 20 years; it is crack-resistant and frost-resistant, and still has good elasticity at low temperatures; it has good adhesion and does not fall off or peel.

[0287] 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 by 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. An initial water-resistant coating, characterized in that: The initial water-resistant coating comprises, by weight:

2. The initial water-resistant coating according to claim 1, characterized in that: The raw materials for preparing the hydrophobically modified styrene-butadiene latex include, by weight: Preferably, the silane coupling agent is selected from any one or a combination of at least two of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane; Preferably, the water is deoxygenated deionized water; Preferably, the hydrophobically modified styrene-butadiene latex is prepared by the following steps: (a) mixing sodium formaldehyde sulfoxylate, potassium persulfate, sodium phosphate dodecahydrate and water, and heating to obtain a first feed liquid; mixing butadiene and styrene to obtain a second feed liquid; (b) adding the second feed liquid to the first feed liquid under stirring, mixing, and then performing a first heat preservation treatment to obtain a third feed liquid; (c) adding tert-dodecyl mercaptan dropwise to the third feed liquid under stirring, and after the addition is complete, performing a second heat preservation treatment to obtain a fourth feed liquid; (d) adding a silane coupling agent to the fourth liquid under stirring, performing a third heat preservation treatment, and filtering to obtain the modified styrene-butadiene latex; Preferably, steps (a), (b) and (c) are carried out under vacuum conditions with a vacuum degree of -0.15 to -0.05 MPa; step (d) is carried out under normal pressure conditions; Preferably, the temperature of the heating in step (a), the temperature of the first heat preservation treatment in step (b), the temperature of the second heat preservation treatment in step (c), and the temperature of the third heat preservation treatment in step (d) are each independently selected from 40 to 60° C.; Preferably, in step (b), the first heat preservation treatment time is 3 to 5 hours; Preferably, in step (c), the time for adding tert-dodecyl mercaptan dropwise is 5 to 7 hours; Preferably, in step (c), the second heat preservation treatment time is 3 to 5 hours; Preferably, in step (d), the three heat preservation treatments are performed for 1 to 3 hours; Preferably, in steps (a), (b) and (c), the stirring speed is independently 50 to 500 rpm; Preferably, in step (d), the filtration uses a filter with a pore size of 1 to 300 μm.

3. The initial water-resistant coating according to claim 1, characterized in that: The hydrophobic contact angle of the super-hydrophobic sericite is ≥150°, and the rolling contact angle is ≤10°; Preferably, the raw materials for preparing the super-hydrophobic sericite include, by weight: Preferably, the silane wetting and defoaming dispersant is selected from siloxane wetting agents with a gemini structure; Preferably, the silane wetting and defoaming dispersant is selected from any one or a combination of at least two of BYK-3480, TEGO wet 280, HY-6085 or BYK-23160; Preferably, the silane coupling agent is selected from any one or a combination of at least two of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane; Preferably, the super-hydrophobic sericite is prepared by the following steps: (A) mixing washed flaky sericite powder with water and grinding to obtain a first material; (B) adding concentrated sulfuric acid to the first material under stirring conditions, and after heat preservation treatment, filtering and washing to obtain a second material; (C) dispersing the second material in water under stirring conditions, adding a silane wetting and defoaming dispersant and a silane coupling agent, and mixing and stirring to obtain a third material; (D) subjecting the third material to vacuum atomization drying to obtain the super-hydrophobic sericite; Preferably, in step (A), the mass ratio of the washed flaky sericite powder to water is (1.5-2.5):1; Preferably, in step (A), the grinding fineness is ≤5 μm; Preferably, in step (B), the temperature of the heat preservation treatment is 80-100° C., and the time of the heat preservation treatment is 10-20 min; Preferably, in steps (B) and (C), the stirring speed is independently 300 to 1200 rpm; Preferably, in step (C), the mixing and stirring time is 0.5 to 2 hours; Preferably, in step (D), the temperature of the vacuum atomization drying is 120-130°C.

4. The initial water-resistant coating according to claim 1, characterized in that: The acrylic emulsion has a weight average molecular weight of 10,000 to 50,000, a viscosity of 100 to 1500 cps, and a solid content of 20 to 70 wt %; Preferably, the silane coupling agent is selected from any one of (3-glycidoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, hexadecyltrimethoxysilane, trifluoropropylmethyldiethoxysilane, trifluoropropylmethyldimethoxysilane or trifluoropropyltriethoxysilane, or a combination of at least two thereof.

5. The initial water-resistant coating according to claim 1, characterized in that: The functional additive is selected from any one or a combination of at least two of a wetting and dispersing agent, a defoaming agent, a leveling agent, a thickener, a release agent, an antifreeze agent, a film-forming aid, a pH regulator, and a high-gloss liquid wax; Preferably, the initial water-resistant coating further comprises the following components:

6. The initial water-resistant coating according to claim 5, characterized in that: The wetting and dispersing agent is selected from any one of TEGO wet270, BYK-1789, BYK-2008 or SN-4741 or a combination of at least two thereof; Preferably, the defoaming agent is selected from silicone wetting agents with a gemini structure; Preferably, the defoamer is selected from any one or a combination of at least two of BYK-3480, TEGO wet 280, HY-6085 or BYK-23160; Preferably, the leveling agent is selected from any one of L18, BF 6333, D 510, HT 388 or FLow 3610, or a combination of at least two thereof; Preferably, the thickener is selected from any one or a combination of at least two of an alkali swelling thickener, a nonionic associative polyurethane thickener, attapulgite, a molecular sieve or white carbon black; Preferably, the separator is selected from lithium magnesium silicate; Preferably, the antifreeze agent is propylene glycol; Preferably, the film-forming aid is selected from alcohol ester dodecaned and / or dipropylene glycol butyl ether, preferably a combination of alcohol ester dodecaned and dipropylene glycol butyl ether; Preferably, the mass ratio of the alcohol ester dodecaned to dipropylene glycol butyl ether is (0.5-2):1; Preferably, the pH adjuster is selected from dimethylethanolamine; Preferably, the glossiness of the high-gloss liquid wax is 85-100.

7. A method for preparing an initial water-resistant coating according to any one of claims 1 to 6, characterized in that: The preparation method comprises: (1) mixing water, a silane coupling agent, super-hydrophobic sericite, titanium dioxide, talcum powder and a functional additive, and performing a first dispersion treatment to obtain a mixed material; (2) Adding acrylic emulsion and hydrophobically modified styrene-butadiene latex to the mixed material under stirring, performing a second dispersion treatment, and obtaining the initial water-resistant coating.

8. The method for preparing the initial water-resistant coating according to claim 7, characterized in that: In step (1), the rotation speed of the primary dispersion treatment is 600 to 1000 rpm; Preferably, the fineness of the mixed material is ≤10 μm; Preferably, in step (1), the mixed material is prepared by the following steps: After mixing water, antifreeze agent and film-forming aid, add pH adjuster and isolation agent in sequence under stirring at a rotation speed of 600-1000 rpm, disperse at a rotation speed of 600-1000 rpm for 20-40 minutes, then add wetting dispersant, defoamer, leveling agent, silane coupling agent, thickener, superhydrophobic sericite, titanium dioxide, talcum powder and high gloss liquid wax in sequence, disperse at a rotation speed of 600-1000 rpm for 20-40 minutes to obtain a mixed material.

9. The method for preparing the initial water-resistant coating according to claim 7, characterized in that: In step (2), the rotation speed of the second dispersion treatment is ≤500 rpm; Preferably, the second dispersion treatment lasts for 5 to 60 minutes; Preferably, during the second dispersion treatment, the temperature of the material is controlled below 40°C.

10. Use of the initial water-resistant coating according to any one of claims 1 to 6 in preparing coatings for containers, vehicles, ships, engineering machinery or military equipment.

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