CN109762443B - Water-based single-component primer-topcoat coating and preparation method and application thereof - Google Patents
Water-based single-component primer-topcoat coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a water-based single-component primer-topcoat coating, a preparation method and application thereof, wherein the coating comprises the following components in percentage by mass: 30-60% of water-based epoxy ester resin, 2-10% of water, 10-25% of pigment, 20-40% of filler and 1.1-7% of auxiliary agent; the paint does not contain a wetting dispersant and a film-forming assistant. The paint is used as a fresh water drinking cabin paint, a container inner cabin paint or a steel structure light anti-corrosion paint, has a simple formula and a simple preparation method, can uniformly disperse pigments and fillers in a water phase system, and has excellent antirust property, film forming property, chemical resistance and impact resistance.
Description
Technical Field
The invention relates to the field of coatings, in particular to a water-based single-component primer-topcoat coating and a preparation method and application thereof.
Background
The drinking fresh water cabin coating comprises a solvent type, a high solid type and a solvent-free type epoxy coating, and after the solvent type coating is dried and cured in a closed environment, the solvent in a paint film is difficult to volatilize completely, so that the protection service life of the coating is influenced, and secondary pollution is caused to fresh water. Under the great situation of energy conservation and emission reduction and environmental protection, the high-solid paint tends to be developed gradually to the solvent-free paint. In addition, the traditional anticorrosive coating systems mainly comprise two types, namely a primer + middle coating + top coating composite anticorrosive coating system or a primer + top coating composite anticorrosive coating system. The primer mainly protects the surface of the base material and provides good adhesion and corrosion resistance; the intermediate coating mainly plays a role in repairing and filling, so that the surface of the base material is smooth, the finish coating is favorably coated, the finish coating mainly plays a role in decoration and protection, and the intermediate coating has the characteristics of high hardness, high wear resistance, high chemical performance and the like. However, the two coating processes are complex, the construction period is long, and the matching performance of the whole coating system is easy to cause. Meanwhile, the VOC content of the traditional anticorrosive coating system is higher.
The water-based primer-topcoat paint is accepted by the masses of consumers by the characteristics of low VOC, energy conservation, no toxicity and environmental protection, but most of the water-based primer-topcoat paint in the market is two-component primer-topcoat paint, the using method is too complicated, the formula of a product of the single-component water-based primer-topcoat paint is complex, the corrosion resistance is poor, the surface effect of a paint film is poor, the paint film is very thin, and the impact resistance and the chemical resistance are poor.
CN108485458A discloses a primer-topcoat two-component epoxy orange-peel paint, which comprises 4 parts by weight of a component A and 1 part by weight of a component B; the component A comprises: 60-70% of bisphenol A type nonionic aqueous epoxy dispersion, 3-5% of an environment-friendly solvent, 0.1-0.2% of a base material wetting agent, 0.2-0.4% of a defoaming agent, 9-18% of deionized water, 0.2-0.5% of modified magnesium lithium silicate, 0.2-0.5% of bentonite, 0.5-1% of an aqueous anti-flash rust agent, 1-2% of an aqueous association type modified polyurethane thickener, 0.5-1% of a polydimethylsiloxane orange-peel auxiliary agent and 10-15% of color paste; the component B comprises: 70-80% of water-based epoxy curing agent, 5-10% of industrial alcohol and 10-25% of deionized water. The water-based two-component epoxy orange-peel paint with the stable orange-peel effect and the unified bottom surface is provided, but the orange-peel paint is too complicated in use method and has high requirements on constructors.
CN107057533A discloses a water-based single-component primer-topcoat paint and a preparation method thereof, wherein the raw materials comprise the following components: waterborne epoxy resin modified acrylic emulsion: 400-600 parts of a pH regulator: 1-3 parts of an environment-friendly cosolvent: 30-80 parts of a dispersant: 5-20 parts of a defoaming agent: 0.5-3 parts of a leveling agent: 2-3 parts of a base material wetting agent: 3-5 parts of an anti-flash rust agent: 5-20 parts of a thickening agent: 10-20 parts of an anti-settling agent: 20-40 parts of pigment: 50 parts of antirust filler: 70-150 parts, deionized water: 150-250 parts by weight, and mixing and stirring. The water-based single-component primer-topcoat in one paint has the characteristics of high drying speed, high corrosion resistance, low VOC content, simple construction operation, high one-time film forming performance and the like, but the formula is too complex, and the preparation steps are complex.
CN105524544B discloses an ultra-weather-resistant self-cleaning heavy-duty anticorrosion primer-topcoat protective coating, which contains a component A and a component B, wherein the component A comprises the following components in percentage by weight: 30-50% of polyurethane resin, 15-18% of solvent, 1-2% of thixotropic agent, 1-2% of defoaming agent, 7-22% of titanium dioxide, 12-25% of barite, 3-6% of organophilic zinc molybdate, 1-2% of flatting agent and 2-3% of super-hydrophobic auxiliary agent; the component B is 100 percent of isocyanate resin; the component A and the component B are mixed before coating. The invention takes polyurethane resin as a base material and isocyanate group as a curing agent to prepare the acid-resistant alkali-resistant heavy-duty anticorrosive paint; after the titanium dioxide, the leveling agent, the hydrophobic auxiliary agent and other functional materials are added, the paint has good weather resistance and hydrophobicity, has certain repellency and decomposition function on dust and certain pollutants, can meet the requirements of petrifaction and related industries on the anticorrosive protection paint for open-air steel structure equipment, but has too complex formula and too complicated use method.
Therefore, the development of a water-based single-component primer-topcoat coating with a simple formula is urgently needed in the field, and the water-based single-component primer-topcoat coating has the advantages of excellent corrosion resistance, good surface effect of a paint film, simple use method and the like.
Disclosure of Invention
In view of the defects of the prior art, one of the purposes of the invention is to provide a water-based single-component primer-topcoat coating, which comprises the following components in percentage by mass:
the sum of the mass percentages of all the components of the coating is 100%;
the paint does not contain a wetting dispersant and a film-forming assistant.
The content of the waterborne epoxy ester resin is 30-60%, such as 35%, 40%, 45%, 50%, 55% or 58%.
The water content is 2-10%, for example 3%, 4%, 5%, 6%, 7%, 8% or 9%.
The content of the pigment is 10-25%, for example 11%, 15%, 20% or 24%.
The content of the filler is 20-40%, for example 22%, 25%, 30%, 35% or 38%.
The content of the auxiliary agent is 1.1-7%, such as 1.3%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0% or 6.5%.
The water-based epoxy ester resin can be adsorbed on the surfaces of the pigment and the filler to form steric hindrance, so that the dispersion is stably present in the water-phase dispersion medium to play a role in wetting and dispersing, wetting and dispersing agents are not needed in the formula, the formula is simplified, and meanwhile, good performances such as corrosion resistance, impact resistance and the like are not lost
The addition amount of the water-based epoxy ester resin is required to be proper and is kept between 30 and 60 percent, the viscosity is increased due to excessive use amount, the water resistance and chemical resistance of a coating film are poor, the hardness is reduced, and good wetting dispersion and rust prevention effects cannot be achieved due to too little use amount.
Preferably, the waterborne epoxy ester resin comprises the following components in percentage by mass:
the sum of the mass percentages of all the components of the waterborne epoxy ester resin is 100 percent.
The content of the fatty acid modified epoxy resin is 30-35%, for example, 32%, 33%, or 34%.
The content of the styrene and acrylic acid graft copolymer is 8-10%, such as 8.5%, 9.0% or 9.5%.
The content of the ethylene glycol monobutyl ether is 1-5%, such as 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0% or 4.5%.
The content of the triethylamine is 1-5%, for example, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, or 4.5%.
The water content is 45-50%, such as 46%, 47%, 48% or 49%.
The preparation method of the fatty acid modified epoxy resin is a conventional technical means, and a person skilled in the art can know the preparation method of the fatty acid modified epoxy resin through the prior art or obtain the resin commercially, and the preparation method is not particularly limited in the invention.
The waterborne epoxy ester resin adopted by the invention contains a large amount of long-chain aliphatic hydrocarbon groups, and is supplemented with styrene and acrylic acid graft copolymer, and the waterborne epoxy ester resin can form more stable steric hindrance on the pigment and the filler in a coating system so as to ensure that the pigment and the filler are dispersed more stably; the waterborne epoxy ester resin has low surface tension, and can well reduce the interfacial tension, so that the waterborne epoxy ester resin has good wettability on pigments and fillers; in addition, the waterborne epoxy ester resin contains a large amount of polar micromolecule components, and the polar micromolecules have good capability of wetting and dispersing pigments and fillers, and do not need to be additionally added with wetting and dispersing agents.
In addition, the introduction of the long chain segment can increase the flexibility of the resin, so that the coating has higher flexibility, excellent impact resistance and easier smearing.
Preferably, the fatty acid modified epoxy resin comprises any one or at least two of fatty acid modified bisphenol A epoxy resin, fatty acid modified bisphenol F epoxy resin, fatty acid modified bisphenol glycidyl ether, fatty acid modified aliphatic glycidyl ether and fatty acid modified novolac epoxy resin.
Preferably, the fatty acid-modified epoxy resin has the structure of formula (I):
in the formula (I), R is3Selected from substituted or unsubstituted chain alkyl of C8-C12;
in the formula (I), X is
The R is1、R2Each independently selected from hydrogen or methyl;
in the formula (I), the ratio of n to m is 2-4: 2.
The fatty acid modified epoxy resin with the structure shown in the formula (I) is selected, hydroxyl is introduced to enable the resin to have high hydrophilicity, the resin is cooperated with long-chain aliphatic hydrocarbon groups to further improve the dispersibility of pigments and fillers in water, when the number ratio of aliphatic chains to hydroxyl is 2-4: 2, the resin has the best hydrophilic and hydrophobic properties, and the balance is damaged when the ratio is too high or too low.
The fatty acid modified epoxy resin with the structure shown in the formula (I) has good self-crosslinking property and low Tg value, so that no film-forming additive is required to be added, a coating film is compact, the surface effect is good, and the coating film has excellent corrosion resistance, water resistance and salt spray resistance.
Preferably, the weight average molecular weight of the fatty acid modified epoxy resin is 1200 to 1800, such as 1250, 1500, 1600, 1700 or 1750 and the like.
Preferably, the coating has a pH of 7.5 to 8.5, such as 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, or 8.4.
Preferably, the viscosity of the coating is 125 to 135KU, such as 126KU, 127KU, 128KU, 129KU, 130KU, 131KU, 132KU, 133KU or 134 KU.
Preferably, the coating comprises the following components in percentage by mass:
the content of the flash rust inhibitor is 0.1-2%, such as 0.2%, 0.5%, 0.8%, 1.0%, 1.2%, 1.5%, 1.8%, or 1.9%.
The content of the pH regulator is 0.2-0.5%, such as 0.3%, 0.35% or 0.4%.
The content of the rheological additive is 0.1-1%, such as 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 0.95%.
The content of the defoaming agent is 0.5-3%, for example, 0.6%, 1.0%, 1.5%, 2.0%, 2.5%, 2.8%, or the like.
The content of the drier is 0.2-0.5%, such as 0.25%, 0.30%, 0.35%, 0.40%, 0.45% or 0.48%.
The addition of the flash rust inhibitor can be cooperated with the waterborne epoxy ester resin, so that the antirust performance of the coating is further improved.
Preferably, the flash rust inhibitor comprises any one or a combination of at least two of a fatty acid salt, a nitrite salt and a molybdate salt.
Preferably, the pH adjusting agent comprises dimethylethanolamine and/or hexamethylenediamine.
Preferably, the rheology aid comprises an organobentonite clay.
Preferably, the defoaming agent includes any one or a combination of at least two of silicone emulsion, higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, and polydimethylsiloxane, and the like.
Preferably, the pigment comprises one or more of iron oxide red, iron oxide black, titanium dioxide, carbon black, phthalocyanine blue, iron oxide yellow, chrome yellow, molybdenum chrome red and Bayer red.
Preferably, the filler comprises any one or at least two of talcum powder, calcium sulfate, ground calcium carbonate, barium sulfate, kaolin, zinc oxide, glass flake, mica powder and quartz powder.
Preferably, the drier comprises an organic acid soap drier, preferably any one or a combination of at least two of cobalt, manganese, lead, zinc and calcium.
Due to the good compatibility between the drier and the resin, the addition of the drier can cooperate with the waterborne epoxy ester resin, so that the paint film catalyzes and promotes the crosslinking of resin polymers in a long-term drying process, the paint has a faster film forming speed, the hardness of the paint film is further improved, and the paint film has good appearance. And maintain good hydrolysis resistance during storage.
The second purpose of the invention is to provide a preparation method of the water-based single-component primer-topcoat coating, which comprises the following steps: adding water, an auxiliary agent, the waterborne epoxy ester resin, a pigment and a filler in a formula amount into a reaction container, stirring, sanding to obtain a sanded product, stirring, and adjusting the pH value and the viscosity to obtain the waterborne single-component primer-topcoat integrated coating.
The water-based epoxy ester resin can be adsorbed on the surfaces of the pigment and the filler to form steric hindrance, so that the dispersion is stably present in a water-phase dispersion medium, and the wetting and dispersing effects can be achieved even if the wetting dispersant is not added, the types of feeding materials are simplified, and the experimental steps are reduced.
Preferably, the particle size of the sanded product is ≦ 30 μm, such as 29 μm, 25 μm, or 20 μm, and the like.
Preferably, the preparation method specifically comprises the following steps:
(1) adding water, an anti-flash rust agent and a rheological additive in a formula amount into a stirring kettle, stirring for the first time, adding the water-based epoxy ester resin in the formula amount, stirring for the second time until the mixture is uniform, adding the pigment, the filler and the defoaming agent in the formula amount of 50%, and stirring for the third time until the mixture is uniform to obtain a semi-finished product;
(2) sanding the semi-finished product to obtain a sanded product, transferring the sanded product to a stirring kettle, stirring for the fourth time until the sanded product is uniformly mixed, then adding 50% of defoaming agent and formula amount of drier, stirring for the fifth time until the sanded product is uniformly mixed, adding a pH regulator to adjust the pH value, and adding a thickening agent or water to adjust the viscosity to obtain a pre-product;
(3) and (4) filtering the pre-product through a filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Preferably, the rotation speed of the first stirring is 500-1000 r/min, such as 550r/min, 600r/min, 650r/min, 700r/min, 750r/min, 800r/min, 850r/min, 900r/min or 950r/min, and the like, and the time is 5-10 min, such as 6min, 7min, 8min or 9 min.
Preferably, the rotation speed of the second stirring is 300-500 r/min, such as 350r/min, 380r/min, 400r/min, 450r/min or 480 r/min.
Preferably, the rotation speed of the third stirring is 500-1000 r/min, such as 550r/min, 600r/min, 650r/min, 700r/min, 750r/min, 800r/min, 850r/min, 900r/min or 950 r/min.
Preferably, the rotation speed of the fourth stirring is 300-500 r/min, such as 350r/min, 380r/min, 400r/min, 450r/min or 480 r/min.
Preferably, the rotation speed of the fifth stirring is 300-500 r/min, such as 350r/min, 380r/min, 400r/min, 450r/min or 480 r/min.
Preferably, the mesh number of the filter screen is 120 meshes.
The invention also aims to provide the application of the water-based single-component primer-topcoat coating which is used as a fresh water tank coating, a container inner tank coating or a steel structure light anti-corrosion coating.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the invention, the waterborne epoxy ester resin is introduced into the coating formula, and the resin can be adsorbed on the surfaces of the pigment and the filler to form steric hindrance, so that the dispersion is stably present in a water-phase dispersion medium, and the effect of wetting and dispersing is achieved, therefore, a wetting dispersant is not required in the formula, the formula is simplified, and the preparation method is simple.
In addition, the addition amount of the water-based epoxy ester resin is kept between 30 and 60 percent, the viscosity is increased due to excessive use amount, the water resistance and chemical resistance of a coating film are poor, the hardness is reduced, and good effects such as wetting dispersion and rust prevention cannot be achieved due to too little use amount.
(2) The water-based epoxy ester resin adopted in the preferable scheme contains a large amount of long-chain aliphatic hydrocarbon groups, and is assisted by the styrene and acrylic acid graft copolymer, the water-based epoxy ester resin can form more stable steric hindrance on the pigment and the filler in a coating system so as to enable the pigment and the filler to be dispersed more stably, the surface tension of the water-based epoxy ester resin is low, the interfacial tension can be well reduced, and therefore the water-based epoxy ester resin can have good wettability on the pigment and the filler; in addition, the waterborne epoxy ester resin contains a large amount of polar micromolecule components, and the polar micromolecules have good capability of wetting and dispersing pigments and fillers, and do not need to be additionally added with wetting and dispersing agents.
In addition, the introduction of long chain segments increases the flexibility of the resin, thereby making the coating have higher impact resistance and easier to smear.
(3) In a preferable scheme, the introduced hydroxyl can enable the resin to have higher hydrophilicity, the resin can further improve the dispersibility of the pigment and the filler in water by cooperating with a long-chain aliphatic hydrocarbon group, and when the number of the aliphatic chain and the hydroxyl is 2-4: 2, the resin has the optimal hydrophilic and hydrophobic properties, and the balance is broken by too high or too low proportion.
In addition, the fatty acid modified epoxy resin with the structure shown in the formula (I) has good self-crosslinking property and low Tg value, so that no film-forming additive is required to be added, a coating film is compact, the surface effect is good, and the coating film has excellent corrosion resistance, water resistance and salt spray resistance.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The water-based single-component primer-topcoat integrated coating comprises the following components in percentage by mass:
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the structure of the fatty acid modified epoxy resin is as follows:
wherein the ratio of n to m is 3:2, and X is
M of the fatty acid-modified epoxy resinw＝1500。
The preparation method of the water-based single-component primer-topcoat coating comprises the following steps:
(a) adding water, fatty acid salt and organic bentonite according to the formula amount into a stirring kettle, stirring for 5-10 min at 800r/min, adding waterborne epoxy ester resin according to the formula amount, stirring until the mixture is uniformly mixed at 400r/min, adding iron oxide red, titanium dioxide, barium sulfate talcum powder according to the formula amount and 50% hydrophobic siloxane mixture defoamer according to the formula amount, and stirring until the mixture is uniformly mixed at 800r/min to obtain a semi-finished product;
(b) sanding the semi-finished product to obtain a sanded product with the particle size of 25 mu m, transferring the sanded product to a stirring kettle, stirring at 400r/min until the sanded product is uniformly mixed, then adding 50% of hydrophobic siloxane mixture defoamer and the formula amount of chelating cobalt water drier, stirring at 400r/min until the sanded product is uniformly mixed, adding hexamethylene diamine to adjust the pH value to 8, and adding a thickening agent or water to adjust the viscosity to 130KU to obtain a pre-product;
(c) and (3) filtering the pre-product with a 120-mesh filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Example 2
The difference from example 1 is that the mass of the fatty acid-modified epoxy resin or the like is replaced with that of the unmodified epoxy resin.
The unmodified epoxy resin has the following structure:
wherein X is
The unmodified epoxy resin Mw＝1100。
Example 3
The difference from example 1 is that the structure of the fatty acid-modified epoxy resin is as follows:
wherein X is
The fatty acid modified epoxy resin Mw＝1500。
Example 4
The difference from example 1 is that the composition of the waterborne epoxy ester resin does not contain styrene and acrylic acid graft copolymer.
Example 5
The difference from example 1 is that the structure of the fatty acid-modified epoxy resin is as follows:
Example 6
The difference from example 1 is that the structure of the fatty acid-modified epoxy resin is as follows:
Example 7
The difference from example 1 is that the structure of the fatty acid-modified epoxy resin is as follows:
Example 8
The difference from example 1 is that the structure of the fatty acid-modified epoxy resin is as follows:
Example 9
The only difference from example 1 is that the aqueous one-component primer-in-one coating composition does not contain a flash rust inhibitor, and accordingly no flash rust inhibitor is added to the preparation process.
Example 10
The only difference from example 1 is that the aqueous one-component primer-surfacer coating composition does not contain a drier, and accordingly no drier is added to the preparation process.
Example 11
The water-based single-component primer-topcoat integrated coating comprises the following components in percentage by mass:
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the structure of the fatty acid modified epoxy resin is as follows:
wherein the ratio of n to m is 3:2, and X is
M of the fatty acid-modified epoxy resinw＝1200。
The preparation method of the water-based single-component primer-topcoat coating comprises the following steps:
(a) adding water, fatty acid salt and organic bentonite according to the formula amount into a stirring kettle, stirring for 5min at 500r/min, adding waterborne epoxy ester resin according to the formula amount, stirring until the mixture is uniform at 300r/min, adding phthalocyanine blue, titanium dioxide, zinc oxide according to the formula amount and 50% hydrophobic siloxane mixture defoamer according to the formula amount, and stirring until the mixture is uniform at 500r/min to obtain a semi-finished product;
(b) sanding the semi-finished product to obtain a sanded product with the particle size of 25 mu m, transferring the sanded product to a stirring kettle, stirring at 300r/min until the sanded product is uniformly mixed, then adding 50% of hydrophobic siloxane mixture defoamer and the formula amount of chelating cobalt aqueous drier, stirring at 300r/min until the sanded product is uniformly mixed, adding hexamethylenediamine to adjust the pH value to 7.5, and adding a thickening agent or water to adjust the viscosity to 125KU to obtain a pre-product;
(c) and (3) filtering the pre-product with a 120-mesh filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Example 12
The water-based single-component primer-topcoat integrated coating comprises the following components in percentage by mass:
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the structure of the fatty acid modified epoxy resin is as follows:
wherein the ratio of n to M is 3:2, Mw1800 wherein X is
The preparation method of the water-based single-component primer-topcoat coating comprises the following steps:
(a) adding water, fatty acid salt and organic bentonite with the formula amount into a stirring kettle, stirring for 10min at 1000r/min, adding waterborne epoxy ester resin with the formula amount, stirring until the mixture is uniform at 500r/min, adding Bayer red, titanium dioxide, barium sulfate with the formula amount and 50% hydrophobic siloxane mixture defoamer with the formula amount, and stirring until the mixture is uniform at 1000r/min to obtain a semi-finished product;
(b) sanding the semi-finished product to obtain a sanded product with the particle size of 25 mu m, transferring the sanded product to a stirring kettle, stirring at 500r/min until the sanded product is uniformly mixed, then adding 50% of hydrophobic siloxane mixture defoamer and the formula amount of chelating cobalt aqueous drier, stirring at 500r/min until the sanded product is uniformly mixed, adding hexamethylenediamine to adjust the pH value to 8.5, and adding a thickening agent or water to adjust the viscosity to obtain a pre-product;
(c) and (3) filtering the pre-product with a 120-mesh filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Example 13
The water-based single-component primer-topcoat integrated coating comprises the following components in percentage by mass:
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the structure of the fatty acid modified epoxy resin is as follows:
The preparation method of the water-based single-component primer-topcoat coating comprises the following steps:
(a) adding water, fatty acid salt and organic bentonite according to the formula amount into a stirring kettle, stirring for 5-10 min at 800r/min, adding waterborne epoxy ester resin according to the formula amount, stirring until the mixture is uniform at 400r/min, adding chrome yellow, titanium dioxide, barium sulfate according to the formula amount and 50% hydrophobic siloxane mixture defoamer according to the formula amount, and stirring until the mixture is uniform at 800r/min to obtain a semi-finished product;
(b) sanding the semi-finished product to obtain a sanded product with the particle size of 25 mu m, transferring the sanded product to a stirring kettle, stirring at 400r/min until the sanded product is uniformly mixed, then adding 50% of hydrophobic siloxane mixture defoamer and the formula amount of chelating cobalt water drier, stirring at 400r/min until the sanded product is uniformly mixed, adding hexamethylene diamine to adjust the pH value to 8, and adding a thickening agent or water to adjust the viscosity to 130KU to obtain a pre-product;
(c) and (3) filtering the pre-product with a 120-mesh filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Example 14
The water-based single-component primer-topcoat integrated coating comprises the following components in percentage by mass:
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the structure of the fatty acid modified epoxy resin is as follows:
(the ratio of n to M is 3:2, Mw1500) where X is
The preparation method of the water-based single-component primer-topcoat coating comprises the following steps:
(a) adding water, fatty acid salt and organic bentonite according to the formula amount into a stirring kettle, stirring for 5-10 min at 800r/min, adding waterborne epoxy ester resin according to the formula amount, stirring until the mixture is uniformly mixed at 400r/min, adding molybdenum chrome red, titanium dioxide, zinc oxide according to the formula amount and 50% hydrophobic siloxane mixture defoamer according to the formula amount, and stirring until the mixture is uniformly mixed at 800r/min to obtain a semi-finished product;
(b) sanding the semi-finished product to obtain a sanded product with the particle size of 30 microns, transferring the sanded product to a stirring kettle, stirring at 400r/min until the sanded product is uniformly mixed, then adding 50% of hydrophobic siloxane mixture defoaming agent and the chelating type cobalt water drier according to the formula, stirring at 400r/min until the sanded product is uniformly mixed, adding hexamethylene diamine to adjust the pH value to 8, and adding thickening agent or water to adjust the viscosity to 130KU to obtain a pre-product;
(c) and (3) filtering the pre-product with a 120-mesh filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Example 15
The water-based single-component primer-topcoat integrated coating comprises the following components in percentage by mass:
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the structure of the fatty acid modified epoxy resin is as follows:
The preparation method of the water-based single-component primer-topcoat coating comprises the following steps:
(a) adding water, fatty acid salt and organic bentonite according to the formula amount into a stirring kettle, stirring for 5-10 min at 800r/min, adding waterborne epoxy ester resin according to the formula amount, stirring until the mixture is uniformly mixed at 400r/min, adding phthalocyanine green, titanium dioxide, barium sulfate according to the formula amount and 50% hydrophobic siloxane mixture defoamer according to the formula amount, and stirring until the mixture is uniformly mixed at 800r/min to obtain a semi-finished product;
(b) sanding the semi-finished product to obtain a sanded product with the particle size of 25 mu m, transferring the sanded product to a stirring kettle, stirring at 400r/min until the sanded product is uniformly mixed, then adding 50% of hydrophobic siloxane mixture defoamer and the formula amount of chelating cobalt water drier, stirring at 400r/min until the sanded product is uniformly mixed, adding hexamethylene diamine to adjust the pH value to 8, and adding a thickening agent or water to adjust the viscosity to 130KU to obtain a pre-product;
(c) and (3) filtering the pre-product with a 120-mesh filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
Comparative example 1
The difference from example 1 is that the quality of the water-based epoxy ester resin and the like is replaced by the acrylic resin.
Comparative example 2
The difference from the example 1 is that the water-based single-component primer-topcoat coating comprises the following components in percentage by mass:
comparative example 3
The difference from the example 1 is that the water-based single-component primer-topcoat coating comprises the following components in percentage by mass:
and (3) performance testing: the coatings of the examples and comparative examples were subjected to performance tests as specified in HG/T4759-2014 waterborne epoxy resin anticorrosive coatings, and the results are shown in Table 1.
TABLE 1
As can be seen from table 1, the overall performance of the coatings in examples 1 to 15 is superior to that of the coatings in examples 1 to 3, and particularly, the coating in a container is in a uniform state, which proves that the coating provided by the invention can still stably disperse the pigment and the filler in the medium without adding the wetting dispersant to form a uniform system, because the waterborne epoxy ester resin is introduced into the coating formula, the resin can be adsorbed on the surfaces of the pigment and the filler to form steric hindrance, so that the dispersion stably exists in the aqueous dispersion medium, and the wetting dispersion effect is achieved; in addition, when the content of the water-based epoxy ester resin in the coating is more than 60% (comparative example 3) or less than 30% (comparative example 2), good wetting dispersion effect cannot be achieved, and properties such as water resistance and salt spray resistance are deteriorated, since too much amount causes viscosity to be increased and the system to be non-uniform, and the coating film has poor water resistance and chemical resistance and reduced hardness, and too little amount does not achieve good wetting dispersion and rust prevention effects.
It can be seen from comparative examples 1, 2 and 4 that the coating material containing the fatty acid-modified epoxy resin (example 1) is better in the container state and better in impact resistance than the coating material containing the unmodified epoxy resin (example 2); the coating material comprising styrene and acrylic graft copolymer (example 1) is better than the coating material not comprising styrene and acrylic graft copolymer (example 4) in the container because the aqueous epoxy resin used contains a large amount of long-chain aliphatic hydrocarbon group supplemented with styrene and acrylic graft copolymer, and the two cooperate to form more stable steric hindrance to the pigment and filler in the coating system and to disperse the pigment and filler more stably, and in addition, the introduction of long-chain segment increases the flexibility of the resin, so that the coating material has higher flexibility and is better and easy to apply.
As can be seen from comparative examples 1, 3 and 5 to 8, when the fatty acid-modified epoxy resin contains hydroxyl groups and the number of the aliphatic chain and the hydroxyl group in the fatty acid-modified epoxy resin is 2 to 4:2 (examples 1, 5 and 6), the coating has better in-container state, salt spray resistance, water resistance and shorter surface drying time, because the introduction of the hydroxyl group enables the resin to have higher hydrophilicity, and the dispersibility of the pigment and the filler in water can be further improved in cooperation with the long-chain aliphatic hydrocarbon group, and when the number of the aliphatic chain and the hydroxyl group is 2 to 4:2, the resin has the best hydrophilic and hydrophobic properties, and the balance is broken when the ratio is too high or too low, and further, the introduction of the hydroxyl group enables the resin to have strong self-crosslinking property, so that the coating has excellent film-forming properties without the addition of a film-forming aid, Corrosion resistance, water resistance and salt spray resistance.
As can be seen by comparing example 1 with example 9, the coating material with the flash rust inhibitor added (example 1) has better rust inhibitive performance than the coating material without the flash rust inhibitor added (example 9).
Comparing example 1 with example 10, it can be seen that the paint with the added drier (example 1) has a shorter open time than the paint without added drier (example 10).
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (19)
1. The application of the water-based single-component primer-topcoat coating is characterized in that the coating is used as a fresh water tank coating, a container inner tank coating or a steel structure light anti-corrosion coating;
the coating comprises the following components in percentage by mass:
the sum of the mass percentages of all the components of the coating is 100%;
the paint does not contain a wetting dispersant and a film-forming assistant;
the waterborne epoxy ester resin comprises the following components in percentage by mass:
the sum of the mass percentages of all the components of the waterborne epoxy ester resin is 100%;
the fatty acid modified epoxy resin has the structure of formula (I):
in the formula (I), R is3Selected from substituted or unsubstituted chain alkyl of C8-C12;
in the formula (I), X is
The R is1、R2Each independently selected from hydrogen or methyl;
in the formula (I), the ratio of n to m is 2-4: 2.
2. The use according to claim 1, wherein the fatty acid-modified epoxy resin has a weight average molecular weight of 1200 to 1800.
3. The use according to claim 1, wherein the coating has a pH of 7.5 to 8.5.
4. The use according to claim 1, wherein the viscosity of the coating is 125 to 135 KU.
5. Use according to claim 1, wherein the anti-flash rust agent comprises any one or a combination of at least two of a fatty acid salt, a nitrite salt and a molybdate salt.
6. Use according to claim 1, wherein the pH adjusting agent comprises dimethylethanolamine and/or hexamethylenediamine.
7. Use according to claim 1, wherein the rheological aid comprises an organobentonite.
8. The use according to claim 1, wherein the antifoaming agent comprises any one or a combination of at least two of silicone emulsion, higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane.
9. Use according to claim 1, wherein the pigment comprises one or more of red iron oxide, black iron oxide, titanium dioxide, carbon black, phthalocyanine blue, yellow iron oxide, chrome yellow, molybdate-chrome red and bayer red.
10. Use according to claim 1, wherein the filler comprises any one or a combination of at least two of talc, calcium sulfate, ground calcium carbonate, barium sulfate, kaolin, zinc oxide, glass flake, mica powder and quartz powder.
11. Use according to claim 1, wherein the drier comprises an organic acid soap drier.
12. Use according to claim 11, wherein the organic acid soap driers comprise organic acid soap driers of any one or a combination of at least two of cobalt, manganese, lead, zinc and calcium.
13. Use according to claim 1, characterized in that the preparation method of the coating comprises in particular the following steps:
(1) adding water, an anti-flash rust agent and a rheological additive in a formula amount into a stirring kettle, stirring for the first time, adding the water-based epoxy ester resin in the formula amount, stirring for the second time until the mixture is uniform, adding the pigment, the filler and the defoaming agent in the formula amount of 50%, and stirring for the third time until the mixture is uniform to obtain a semi-finished product;
(2) sanding the semi-finished product to obtain a sanded product, transferring the sanded product to a stirring kettle, stirring for the fourth time until the sanded product is uniformly mixed, then adding 50% of defoaming agent and formula amount of drier, stirring for the fifth time until the sanded product is uniformly mixed, adding a pH regulator to adjust the pH value, and adding a thickening agent or water to adjust the viscosity to obtain a pre-product;
(3) and (4) filtering the pre-product through a filter screen, and packaging to obtain the water-based single-component primer-topcoat coating.
14. The use according to claim 13, wherein the first stirring is performed at a speed of 500 to 1000r/min for 5 to 10 min.
15. The use according to claim 13, wherein the second stirring is carried out at a speed of from 300 to 500 r/min.
16. The use according to claim 13, wherein the third stirring is carried out at a speed of 500 to 1000 r/min.
17. The use according to claim 13, wherein the fourth stirring is carried out at a speed of 300 to 500 r/min.
18. The use according to claim 13, wherein the rotation speed of the fifth stirring is 300 to 500 r/min.
19. Use according to claim 13, wherein the mesh size of the sieve is 120 mesh.
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| CN110607116A (en) * | 2019-10-10 | 2019-12-24 | 宁波宣威彩色世界涂料有限公司 | Water-based multipurpose coating and preparation process thereof |
| CN110804367A (en) * | 2019-11-06 | 2020-02-18 | 辽宁圣图新材料科技有限公司 | Environment-friendly water-based paint |
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| CN102993442A (en) * | 2011-09-13 | 2013-03-27 | 上海涂料有限公司技术中心 | Aqueous acrylic acid modified epoxy ester emulsion and its preparation method |
| CN103756521A (en) * | 2014-01-21 | 2014-04-30 | 西北永新涂料有限公司 | Aqueous acrylic acid modified epoxy-ester emulsion anticorrosion coating and preparation method thereof |
| WO2017116170A1 (en) * | 2015-12-30 | 2017-07-06 | 주식회사 케이씨씨 | Water-soluble anticorrosive paint composition using acrylic-modified epoxy ester resin |
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| CN102993442A (en) * | 2011-09-13 | 2013-03-27 | 上海涂料有限公司技术中心 | Aqueous acrylic acid modified epoxy ester emulsion and its preparation method |
| CN103756521A (en) * | 2014-01-21 | 2014-04-30 | 西北永新涂料有限公司 | Aqueous acrylic acid modified epoxy-ester emulsion anticorrosion coating and preparation method thereof |
| WO2017116170A1 (en) * | 2015-12-30 | 2017-07-06 | 주식회사 케이씨씨 | Water-soluble anticorrosive paint composition using acrylic-modified epoxy ester resin |
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