CN112029397A - Waterborne polyurethane coating and preparation method thereof - Google Patents
Waterborne polyurethane coating and preparation method thereof Download PDFInfo
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- CN112029397A CN112029397A CN202010805471.5A CN202010805471A CN112029397A CN 112029397 A CN112029397 A CN 112029397A CN 202010805471 A CN202010805471 A CN 202010805471A CN 112029397 A CN112029397 A CN 112029397A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The application provides an aqueous polyurethane coating, which comprises a first component and a second component, wherein the first component comprises the following components in parts by weight: 40-60 parts of aqueous hydroxy acrylic emulsion, 20-30 parts of pigment, 3-5 parts of adhesion promoter, 3-10 parts of auxiliary agent, 3-5 parts of cosolvent and 7-25 parts of deionized water; the second component includes an isocyanate curing agent. The waterborne polyurethane coating is a two-component coating, a waterborne hydroxyl acrylic emulsion and an isocyanate curing agent are subjected to a crosslinking curing reaction to form a coating film, and the coating film is cooperated with an adhesion promoter, so that the adhesion of the waterborne polyurethane coating to materials such as stainless steel, light metal and plastic can be effectively improved, and the waterborne polyurethane coating is compounded with a pigment, an auxiliary agent and a cosolvent for use, so that the weather resistance is strong on the basis of ensuring the improvement of the adhesion, the waterborne polyurethane coating can be suitable for a corrosive environment, and meanwhile, the coating system is low in VOC content, good in environmental protection performance and beneficial to.
Description
Technical Field
The application belongs to the technical field of coatings, and particularly relates to a waterborne polyurethane coating and a preparation method thereof.
Background
In daily application, outdoor equipment such as water pumps, motors and transformation equipment are more, the corrosion environment of the industry is variable, and the requirements on the corrosion resistance, the weather resistance and the decoration of products are high. Also, since this field involves a variety of different materials of the substrate, such as: carbon steel, stainless steel, copper, aluminum alloy, galvanized sheet, ABS plastic, etc., so that the paint product should have excellent adhesion to the base material.
The polyurethane coating is prepared by using hydroxy acrylic resin as matrix resin, and matching with an isocyanate curing agent, wherein the hydroxyl in the matrix resin and the isocyanate group in the curing agent are subjected to a crosslinking curing reaction. The cured product has the characteristics of high gloss and high fullness, and meanwhile, the paint film has the advantages of high hardness, wear resistance and the like. Therefore, the paint is widely used in various industrial fields and is a top-grade weather-resistant finish paint with the most extensive application.
However, since the hydroxy acrylic resin itself has a large molecular weight and thus a high viscosity, it is necessary to dilute it with a solvent to reduce the resin viscosity in order to prepare a coating product. Therefore, the conventional solvent type polyurethane coating has a large amount of organic solvents (VOC) in a system, the content of the VOC is usually hundreds of g/L in a construction state, the ecological environment is greatly damaged, and meanwhile, the organic solvents are inflammable and explosive, so that great hidden dangers are also provided for the safety of people.
The water-based paint which is started in recent years has low VOC content, the flash point is usually higher than 60 ℃ due to the existence of water in a system, the water-based paint is not a dangerous product, and the risk of deflagration can be avoided in the storage and use processes. However, the general aqueous polyurethane emulsion has good adhesion to carbon steel substrates, is not ideal for stainless steel, copper, aluminum alloy, especially ABS plastic, and has no good decorative performance, which affects its wide application.
Disclosure of Invention
The application aims to provide the waterborne polyurethane coating and the preparation method thereof, and aims to solve the problem that the waterborne polyurethane coating in the prior art has poor adhesive force on various different base materials.
In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:
in a first aspect, the present application provides an aqueous polyurethane coating, which includes a first component and a second component, wherein the first component includes the following components in parts by weight:
40-60 parts of water-based hydroxyl acrylic emulsion,
20-30 parts of a pigment,
3-5 parts of an adhesion promoter,
2.5 to 10 parts of an auxiliary agent,
3-5 parts of a cosolvent,
7-25 parts of deionized water;
the second component includes an isocyanate curing agent.
In a second aspect, the present application provides a method for preparing the aqueous polyurethane coating, wherein the method for preparing the first component comprises the following steps:
carrying out first mixing treatment on the pigment and deionized water to obtain a first mixture;
grinding the first mixture to obtain a second mixture;
and carrying out second mixing treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the auxiliary agent and the cosolvent to obtain the first component.
The waterborne polyurethane coating provided by the first aspect of the application is a two-component coating, wherein the main substance of the first component is a waterborne hydroxyl acrylic emulsion, the waterborne hydroxyl acrylic emulsion interacts with the isocyanate curing agent of the second component, a crosslinking curing reaction can occur, a coating film is formed, and the adhesive force promoter is cooperated, so that the adhesive force of the waterborne polyurethane coating to materials such as stainless steel, light metal and plastic can be effectively improved, and the waterborne polyurethane coating is compounded with pigment, auxiliary agent and cosolvent for use, thereby further improving the property of the waterborne polyurethane coating, ensuring the improvement of the adhesive force, having stronger weather resistance, being applicable to a corrosive environment, having extremely low VOC content in a coating system, better environmental protection performance and being beneficial to wide application.
The preparation method of the first component of the waterborne polyurethane coating provided by the second aspect of the application is simple and convenient, and can be widely used only by mixing the components.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.
The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The first aspect of the embodiments of the present application provides an aqueous polyurethane coating, which includes a first component and a second component, wherein the first component includes the following components in parts by weight:
40-60 parts of water-based hydroxyl acrylic emulsion,
20-30 parts of a pigment,
3-5 parts of an adhesion promoter,
2.5 to 10 parts of an auxiliary agent,
3-5 parts of a cosolvent,
7-25 parts of deionized water;
the second component includes an isocyanate curing agent.
The aqueous polyurethane coating provided by the first aspect is a two-component coating, wherein the main substance of the first component is an aqueous hydroxy acrylic emulsion, and the aqueous hydroxy acrylic emulsion interacts with the isocyanate curing agent of the second component to generate a cross-linking curing reaction to form a coating film, and cooperates with the adhesion promoter, so that the adhesion of the aqueous polyurethane coating to stainless steel, light metal, plastic and other materials can be effectively improved, and the aqueous polyurethane coating is compounded with pigment, an auxiliary agent and a cosolvent for use, so that the properties of the aqueous polyurethane coating are further improved, the weather resistance is strong on the basis of ensuring the improvement of the adhesion, the coating is suitable for a corrosive environment, the VOC content in a coating system is extremely low, the environmental protection performance is good, and the coating is favorable for wide application.
Specifically, the waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises 40-60 parts of waterborne hydroxyacrylic acid emulsion, the waterborne hydroxyacrylic acid emulsion is mainly synthesized by emulsifying oily vinyl monomers in water under the initiation of a waterborne free radical initiator, and in the using process, the waterborne hydroxyacrylic acid emulsion can interact with an isocyanate curing agent of the second component to generate a crosslinking curing reaction to form a coating. In the specific embodiment of the invention, the waterborne polyurethane coating comprises a first component and a second component, wherein the adding parts of the waterborne hydroxy acrylic emulsion of the first component are selected from 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts and 60 parts.
Preferably, the aqueous hydroxy acrylic emulsion is selected from S5580 type resin self-produced by new materials of Zhuhai Shochen, wherein the type resin is a phosphate ester monomer modified product, and the aqueous hydroxy acrylic emulsion is used as a main component to perform a crosslinking reaction with a curing agent, so that the adhesive force of the coating film to stainless steel and light metal, namely good adhesive force, can be improved.
Further preferably, the mass percentage of hydroxyl in the water-based hydroxyl acrylic emulsion is 1.8-2.0%, and the mass percentage of hydroxyl in the water-based hydroxyl acrylic emulsion is controlled, so that the density of a cross-linked film can be further controlled, and the moderate hardness and high weather resistance of the film are ensured.
Specifically, the waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises 20-30 parts of pigment, and the pigment is mainly used for changing the color of the waterborne polyurethane coating according to needs, so that the applicability of the waterborne polyurethane coating is wider. In the specific embodiment of the invention, the waterborne polyurethane coating comprises a first component and a second component, wherein the adding parts of the pigment of the first component are selected from 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts and 30 parts.
Preferably, the pigment includes a coloring pigment and an extender pigment. The coloring pigment is added, so that a stronger covering force effect is mainly exerted in the coating film; the additive body color mainly plays a role of a filler, can reduce the porosity of the coating film and improve the performance of the coating film.
In some embodiments, the colored pigment is selected from at least one of titanium dioxide, carbon black, phthalocyanine blue. In the specific embodiment of the invention, the coloring pigment is selected from titanium dioxide, and the titanium dioxide is selected as the coloring pigment, so that the function of increasing the covering power in the coating film can be achieved.
In other embodiments, the extender pigment is selected from at least one of barium sulfate, feldspar powder. In the embodiment of the present invention, the extender pigment is selected from barium sulfate, and the improvement of barium sulfate does not adversely affect the gloss of the coating film and maintains a superior surface layer of the coating film.
Preferably, the waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises 3-5 parts of an adhesion promoter, and the addition of the adhesion promoter can improve the surface of non-ferrous metal difficult to adhere in a targeted manner, such as: the adhesive force of aluminum, aluminum alloy zinc, stainless steel, an electroplated surface and the like can improve the ductility and impact resistance of a coating film, and the ductility and impact resistance of the coating film can be improved while the adhesive force is improved. In the specific embodiment of the invention, the waterborne polyurethane coating comprises a first component and a second component, wherein the addition part of the adhesion promoter of the first component is selected from 3 parts, 3.5 parts, 4 parts, 4.5 parts and 5 parts.
Preferably, the adhesion promoter is at least one selected from the group consisting of ETERKYD 4901-B-72 and HB 92-3.
Specifically, the waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises 2.5-10 parts of an auxiliary agent, and the addition of the auxiliary agent is favorable for compounding and improves the use effect. In the specific embodiment of the invention, the waterborne polyurethane coating comprises a first component and a second component, wherein the addition part of the auxiliary agent of the first component is selected from 2.5 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts.
Preferably, the auxiliary agent is at least one selected from a dispersing agent, a leveling agent, an antifoaming agent and a thixotropic auxiliary agent.
In some embodiments, the auxiliary agent is selected from a dispersing agent, and the addition of the dispersing agent can promote uniform dispersion of each component, avoid the effect of influence of precipitation and improve the storage time. Preferably, the dispersant is selected from at least one of TEGO 755W, BYK-190.
In some embodiments, the auxiliary agent is selected from leveling agents, and the addition of the leveling agents can improve the compatibility and smoothness of a paint film and ensure that the formed film surface is flat and smooth in the using process. Preferably, the leveling agent is selected from at least one of TEGO Glide 410 and TEGO Glide 4100.
In some embodiments, the adjuvant is selected from defoamers, which are added to prevent foam formation so that voids do not occur during the coating process. Preferably, the antifoaming agent is selected from at least one of TEGO Airex 901W and TEGO Foamex 810.
In some embodiments, the auxiliary agent is selected from thixotropic agents, and the addition of the thixotropic agent can promote crystal faces and crystal combination of the mineral fine particles in an aqueous dispersion system to form a thixotropic gel containing a large amount of water molecules and form a colloid with higher viscosity. Preferably, the thixotropic agent is selected from at least one of Borchi 0620 and RHEOLATE 299.
Specifically, the water-based polyurethane coating comprises a first component and a second component, wherein the first component comprises 3-5 parts of cosolvent, and the cosolvent is added to facilitate dissolving insoluble substances, so that the using effect is improved. In the specific embodiment of the invention, the waterborne polyurethane coating comprises a first component and a second component, wherein the adding parts of the cosolvent of the first component are selected from 3 parts, 3.5 parts, 4 parts, 4.5 parts and 5 parts.
Preferably, the cosolvent is selected from at least one of dipropylene glycol methyl ether and dipropylene glycol butyl ether.
Specifically, the waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises 7-25 parts of deionized water, and the deionized water is added to facilitate uniform mixing of the components, so that normal use of a coating film is guaranteed.
Specifically, the waterborne polyurethane coating comprises a first component and a second component, wherein the second component comprises an isocyanate curing agent, and the isocyanate curing agent is a waterborne hydroxyl acrylic emulsion which interacts with each other and can generate a crosslinking curing reaction to form a coating film.
Preferably, the isocyanate curing agent is selected from G5705 curing agent produced by new Zhuhai Shochen Material Co., Ltd, the curing agent is general-purpose aqueous HDI trimer curing agent, the solid content of the curing agent is 100%, and the system does not contain any solvent.
Preferably, the mass ratio of the water-based hydroxyl acrylic emulsion to the isocyanate curing agent is (4-5): 1. because the crosslinking and curing actions are generated between the water-based hydroxyl acrylic emulsion and the isocyanate curing agent, the mass ratio of the water-based hydroxyl acrylic emulsion to the isocyanate curing agent is controlled, so that the crosslinking performance of the water-based polyurethane coating is improved, and the excellent crosslinking effect is ensured.
The second aspect of the application provides a preparation method of the waterborne polyurethane coating, and the preparation method of the first component comprises the following steps:
s01, carrying out first mixing treatment on the pigment and deionized water to obtain a first mixture;
s02, grinding the first mixture to obtain a second mixture;
s03, carrying out second mixing treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the auxiliary agent and the cosolvent to obtain a first component.
The preparation method of the first component of the waterborne polyurethane coating provided by the second aspect of the application is simple and convenient, and can be widely used only by mixing the components.
In the step S01, the pigment and the deionized water are subjected to the first mixing treatment for 5 to 10 minutes at 800 to 1200 rpm.
Preferably, when the auxiliary agent is selected from a mixture of a dispersing agent, a leveling agent, an antifoaming agent and a thixotropic auxiliary agent, the pigment, the deionized water and the dispersing agent are subjected to the first mixed material treatment for 5-10 minutes at 800-1200 rpm.
In the step S02, in the step of grinding the first mixture to obtain the second mixture, the fineness of the second mixture obtained by grinding is controlled to be less than or equal to 30 μm, so that the material is more fine and more convenient to use, and the coating process is ensured not to generate particles, which affects the appearance.
In the step S03, the second mixture, the aqueous hydroxy acrylic emulsion, the adhesion promoter, the auxiliary agent, and the cosolvent are subjected to a second mixing treatment for 15-20 minutes at 800-1200 rpm.
Further, in the process of using the water-based polyurethane coating, the prepared first component and a proper amount of second component are mixed. When the product is constructed, the two components are mixed and then can be directly constructed by using airless spraying equipment, if the construction viscosity needs to be adjusted, tap water is added, organic diluent does not need to be additionally added, the environmental pollution does not need to be worried about, and the VOC emission on the coating site is not increased. The coating is water-based, so that the risk of burning explosion is avoided in the storage and transportation process, and the coating is high in environmental protection performance.
The following description will be given with reference to specific examples.
Example 1
Aqueous polyurethane coating
The waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises the following components in parts by weight:
40 parts of water-based hydroxy acrylic emulsion,
30 parts of a pigment, namely, a pigment,
3 parts of an adhesion promoter, namely,
2.5 parts of an auxiliary agent,
3 parts of a cosolvent,
21.5 parts of deionized water;
the second component comprises 10 parts of isocyanate curing agent;
wherein the aqueous hydroxy acrylic emulsion is S5580 type resin which is made by new materials of Zhuhai Zhanchen Co Ltd,
the pigment is selected from titanium dioxide,
the adhesion promoter is selected from Changxing ETERKYD 4901-B-72,
the auxiliary agent is selected from a mixture of 0.5 part of a leveling agent, 0.5 part of a thixotropic agent, 0.5 part of an antifoaming agent and 1 part of a dispersing agent, wherein the leveling agent is selected from a mixture of TEGO Glide 410 and TEGO Glide 4100 in a mass ratio of 1:1, the thixotropic agent is selected from a mixture of Borchi 0620 and RHELATE 299 in a mass ratio of 3:1, the antifoaming agent is selected from a mixture of TEGO Airex 901W and TEGO Foamex810 in a mass ratio of 2:1, the dispersing agent is selected from TEGO 755W,
the cosolvent is selected from a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 1:1,
the isocyanate curing agent is selected from G5705 curing agent produced by new Zhuhai Shochen materials GmbH.
Preparation method of waterborne polyurethane coating
The preparation method of the first component of the waterborne polyurethane coating comprises the following steps:
the aqueous polyurethane coating provided in example 1 provides the components,
carrying out first mixed material treatment on a pigment, deionized water and a dispersing agent for 7 minutes at the condition of 800 rpm;
grinding the first mixture until the fineness is less than or equal to 30 mu m to obtain a second mixture;
and (3) carrying out second mixing treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the flatting agent, the defoaming agent, the thixotropic auxiliary agent and the cosolvent for 15 minutes under the condition of 900rpm to obtain the first component.
In the using process, the prepared first component and the second component are uniformly mixed for use.
Example 2
Aqueous polyurethane coating
The waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises the following components in parts by weight:
45 parts of water-based hydroxy acrylic emulsion,
28 parts of a pigment, namely 28 parts of pigment,
3.5 parts of an adhesion promoter,
2.5 parts of an auxiliary agent,
3 parts of a cosolvent,
19 parts of deionized water;
the second component comprises 11.4 parts of isocyanate curing agent;
wherein the aqueous hydroxy acrylic emulsion is S5580 type resin which is made by new materials of Zhuhai Zhanchen Co Ltd,
the pigment is selected from titanium dioxide,
the adhesion promoter is selected from Changxing ETERKYD 4901-B-72,
the auxiliary agent is selected from a mixture of 0.5 part of a leveling agent, 0.5 part of a thixotropic agent, 0.5 part of an antifoaming agent and 1 part of a dispersing agent, wherein the leveling agent is selected from a mixture of TEGO Glide 410 and TEGO Glide 4100 in a mass ratio of 1:1, the thixotropic agent is selected from a mixture of Borchi 0620 and RHELATE 299 in a mass ratio of 3:1, the antifoaming agent is selected from a mixture of TEGO Airex 901W and TEGO Foamex810 in a mass ratio of 2:1, the dispersing agent is selected from TEGO 755W,
the cosolvent is selected from a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 1:1,
the isocyanate curing agent is selected from G5705 curing agent produced by new Zhuhai Shochen materials GmbH.
Preparation method of waterborne polyurethane coating
The preparation method of the first component of the waterborne polyurethane coating comprises the following steps:
the aqueous polyurethane coating provided in example 2 provides the components,
carrying out first mixed material treatment on a pigment, deionized water and a dispersing agent for 5 minutes at the condition of 800 rpm;
grinding the first mixture until the fineness is less than or equal to 30 mu m to obtain a second mixture;
and (3) carrying out second mixed material treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the flatting agent, the defoaming agent, the thixotropic auxiliary agent and the cosolvent for 15 minutes under the condition of 1000rpm to obtain the first component.
In the using process, the prepared first component and the second component are uniformly mixed for use.
Example 3
Aqueous polyurethane coating
The waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises the following components in parts by weight:
50 parts of water-based hydroxy acrylic emulsion,
26 parts of a pigment, namely 26 parts of,
4 parts of an adhesion promoter, namely,
2.5 parts of an auxiliary agent,
3 parts of a cosolvent,
14.5 parts of deionized water;
the second component comprises 12.5 parts of isocyanate curing agent;
wherein the aqueous hydroxy acrylic emulsion is S5580 type resin which is made by new materials of Zhuhai Zhanchen Co Ltd,
the pigment is selected from titanium dioxide,
the adhesion promoter is selected from Changxing ETERKYD 4901-B-72,
the auxiliary agent is selected from a mixture of 0.5 part of a leveling agent, 0.5 part of a thixotropic agent, 0.5 part of an antifoaming agent and 1 part of a dispersing agent, wherein the leveling agent is selected from a mixture of TEGO Glide 410 and TEGO Glide 4100 in a mass ratio of 1:1, the thixotropic agent is selected from a mixture of Borchi 0620 and RHELATE 299 in a mass ratio of 3:1, the antifoaming agent is selected from a mixture of TEGO Airex 901W and TEGO Foamex810 in a mass ratio of 2:1, the dispersing agent is selected from TEGO 755W,
the cosolvent is selected from a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 1:1,
the isocyanate curing agent is selected from G5705 curing agent produced by new Zhuhai Shochen materials GmbH.
Preparation method of waterborne polyurethane coating
The preparation method of the first component of the waterborne polyurethane coating comprises the following steps:
the aqueous polyurethane coating provided in example 3 provides the components,
carrying out first mixed material treatment on a pigment, deionized water and a dispersing agent for 8 minutes at 1000 rpm;
grinding the first mixture until the fineness is less than or equal to 30 mu m to obtain a second mixture;
and (3) carrying out second mixed material treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the flatting agent, the defoaming agent, the thixotropic auxiliary agent and the cosolvent for 18 minutes under the condition of 1000rpm to obtain the first component.
In the using process, the prepared first component and the second component are uniformly mixed for use.
Example 4
Aqueous polyurethane coating
The waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises the following components in parts by weight:
55 parts of water-based hydroxy acrylic acid emulsion,
24 parts of a pigment, namely 24 parts of,
3.5 parts of an adhesion promoter,
2.5 parts of an auxiliary agent,
3 parts of a cosolvent,
11 parts of deionized water;
the second component comprises 13.5 parts of isocyanate curing agent;
wherein the aqueous hydroxy acrylic emulsion is S5580 type resin which is made by new materials of Zhuhai Zhanchen Co Ltd,
the pigment is selected from titanium dioxide,
the adhesion promoter is selected from Changxing ETERKYD 4901-B-72,
the auxiliary agent is selected from a mixture of 0.5 part of a leveling agent, 0.5 part of a thixotropic agent, 0.5 part of an antifoaming agent and 1 part of a dispersing agent, wherein the leveling agent is selected from a mixture of TEGO Glide 410 and TEGO Glide 4100 in a mass ratio of 1:1, the thixotropic agent is selected from a mixture of Borchi 0620 and RHELATE 299 in a mass ratio of 3:1, the antifoaming agent is selected from a mixture of TEGO Airex 901W and TEGO Foamex810 in a mass ratio of 2:1, the dispersing agent is selected from TEGO 755W,
the cosolvent is selected from a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 1:1,
the isocyanate curing agent is selected from G5705 curing agent produced by new Zhuhai Shochen materials GmbH.
Aqueous polyurethane coatingPreparation method of (1)
The preparation method of the first component of the waterborne polyurethane coating comprises the following steps:
the aqueous polyurethane coating provided in example 4 provides the components,
carrying out first mixed material treatment on a pigment, deionized water and a dispersing agent for 10 minutes at 1000 rpm;
grinding the first mixture until the fineness is less than or equal to 30 mu m to obtain a second mixture;
and (3) carrying out second mixed material treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the flatting agent, the defoaming agent, the thixotropic auxiliary agent and the cosolvent for 18 minutes under the condition of 1200rpm to obtain the first component.
In the using process, the prepared first component and the second component are uniformly mixed for use.
Example 5
Aqueous polyurethane coating
The waterborne polyurethane coating comprises a first component and a second component, wherein the first component comprises the following components in parts by weight:
60 parts of water-based hydroxy acrylic emulsion,
22 parts of a pigment, namely, a pigment,
3.5 parts of an adhesion promoter,
2.5 parts of an auxiliary agent,
3 parts of a cosolvent,
7.5 parts of deionized water;
the second component comprises 15 parts of isocyanate curing agent;
wherein the aqueous hydroxy acrylic emulsion is S5580 type resin which is made by new materials of Zhuhai Zhanchen Co Ltd,
the pigment is selected from titanium dioxide,
the adhesion promoter is selected from Changxing ETERKYD 4901-B-72,
the auxiliary agent is selected from a mixture of 0.5 part of a leveling agent, 0.5 part of a thixotropic agent, 0.5 part of an antifoaming agent and 1 part of a dispersing agent, wherein the leveling agent is selected from a mixture of TEGO Glide 410 and TEGO Glide 4100 in a mass ratio of 1:1, the thixotropic agent is selected from a mixture of Borchi 0620 and RHELATE 299 in a mass ratio of 3:1, the antifoaming agent is selected from a mixture of TEGO Airex 901W and TEGO Foamex810 in a mass ratio of 2:1, the dispersing agent is selected from TEGO 755W,
the cosolvent is selected from a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether with the mass ratio of 1:1,
the isocyanate curing agent is selected from G5705 curing agent produced by new Zhuhai Shochen materials GmbH.
Preparation method of waterborne polyurethane coating
The preparation method of the first component of the waterborne polyurethane coating comprises the following steps:
the aqueous polyurethane coating provided in example 5 provides the components,
carrying out first mixed material treatment on a pigment, deionized water and a dispersing agent for 10 minutes at 1200 rpm;
grinding the first mixture until the fineness is less than or equal to 30 mu m to obtain a second mixture;
and (3) carrying out second mixed material treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the flatting agent, the defoaming agent, the thixotropic auxiliary agent and the cosolvent for 20 minutes under the condition of 1200rpm to obtain the first component.
In the using process, the prepared first component and the second component are uniformly mixed for use.
And (3) performance testing:
and (3) spraying the waterborne polyurethane coating obtained in the examples 1-5 by using an airless spray gun to prepare a plate, and naturally drying for 7 days to perform the following comprehensive performance tests:
salt spray resistance test: the test method was carried out according to GB/T1771-1991,
drying time of a paint film: detection was carried out according to GB/T1728-1979 (1989),
artificial weather aging resistance: detection is carried out according to the GB/T1865-2009 cycle A regulation,
hardness: detection is carried out according to GB/T6739-96,
water resistance, chemical resistance: detection is carried out according to GB/T1733-93,
adhesion force: detection was carried out according to GB/T1720-1979 (1989),
the evaluation results were carried out in accordance with GB/T1766-2008.
And (4) analyzing results:
the waterborne polyurethane coatings obtained in examples 1-5 were sprayed by an airless spray gun to prepare boards, and after drying for 7 days, the following comprehensive performance tests were carried out, and the results are analyzed as shown in table 1:
the coating viscosity of the waterborne polyurethane coating prepared in the embodiment 1 is 80, the coating can be smoothly coated in the construction process, the solid content is more than 95%, the appearance of a coating film is smooth and flat, the surface drying time is less than 4 hours, the actual drying time is less than 24 hours, the carbon steel adhesive force is 0 grade, the stainless steel adhesive force is 1 grade, the aluminum alloy adhesive force is 2 grade, the galvanized plate adhesive force is 3 grade, the ABS adhesive force is 1 grade, the glossiness is 60 degrees, the impact resistance is 50cm, the weather aging resistance is 1000h/1, the chemical resistance is more than 168, and the hardness is HB.
The coating viscosity of the waterborne polyurethane coating prepared in the embodiment 2 is 90, the coating can be smoothly coated in the construction process, the solid content is more than 95%, the appearance of a coating film is smooth and flat, the surface drying time is less than 4 hours, the actual drying time is less than 24 hours, the carbon steel adhesive force is 0 grade, the stainless steel adhesive force is 1 grade, the aluminum alloy adhesive force is 2 grade, the galvanized plate adhesive force is 1 grade, the ABS adhesive force is 1 grade, the glossiness is 75 degrees, the impact resistance is 50cm, the weather aging resistance is 1000h/1, the chemical resistance is more than 168, and the hardness is HB.
The coating viscosity of the waterborne polyurethane coating prepared in the embodiment 3 is 100, the coating can be smoothly coated in the construction process, the solid content is more than 95%, the appearance of a coating film is smooth and flat, the surface drying time is less than 4 hours, the actual drying time is less than 20 hours, the carbon steel adhesive force is 0 grade, the stainless steel adhesive force is 1 grade, the aluminum alloy adhesive force is 1 grade, the galvanized plate adhesive force is 1 grade, the ABS adhesive force is 0 grade, the glossiness is 80 degrees, the impact resistance is 50cm, the weather aging resistance is 1000h/1, the chemical resistance is more than 168, and the hardness is HB.
The waterborne polyurethane coating prepared in the embodiment 4 has the coating viscosity of 125, can be coated smoothly in the construction process, has the solid content of more than 95 percent, is flat and smooth in the appearance of a coating film, has the surface drying time of less than 4 hours, the actual drying time of less than 18 hours, the carbon steel adhesive force of 0 grade, the stainless steel adhesive force of 0 grade, the aluminum alloy adhesive force of 0 grade, the galvanized plate adhesive force of 1 grade, the ABS adhesive force of 0 grade, the glossiness of 85 degrees and the impact resistance of 50cm, and is subjected to artificial weathering aging for 1000h/1, the chemical resistance of more than 168 and the hardness of HB.
The waterborne polyurethane coating prepared in the embodiment 5 has the coating viscosity of 140, can be coated smoothly in the construction process, has the solid content of more than 95 percent, is flat and smooth in coating film appearance, has the surface drying time of less than 2 hours, the actual drying time of less than 12 hours, the carbon steel adhesive force of 0 grade, the stainless steel adhesive force of 0 grade, the aluminum alloy adhesive force of 0 grade, the galvanized plate adhesive force of 0 grade, the ABS adhesive force of 0 grade, the glossiness of 90 degrees and the impact resistance of 50cm, and is subjected to artificial weathering for 1000h/1, the chemical resistance of more than 168 and the hardness of HB.
The coating products are all made by Zhuhai Shochen New materials GmbH.
As is clear from the results in Table 1, the solids content of each example was > 95%, and the appearance, drying time, water resistance, etc. of the coating film were not significantly different. The physical properties, mechanical strength and chemical properties of the examples are slightly different due to the different amounts of resin and extender pigment. From the experimental results: the resin content is increased, the adhesion promoter is increased, and the adhesion to different base materials is correspondingly increased. Referring to the 5 examples, the formula parameters of the example 5 are reasonably designed, the resin content is moderate, and the construction performance and other physical/chemical properties are most balanced.
TABLE 1
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. The waterborne polyurethane coating is characterized by comprising a first component and a second component, wherein the first component comprises the following components in parts by weight:
40-60 parts of water-based hydroxyl acrylic emulsion,
20-30 parts of a pigment,
3-5 parts of an adhesion promoter,
2.5 to 10 parts of an auxiliary agent,
3-5 parts of a cosolvent,
7-25 parts of deionized water;
the second component includes an isocyanate curing agent.
2. The waterborne polyurethane coating as claimed in claim 1, wherein the mass ratio of the waterborne hydroxyl acrylic emulsion to the isocyanate curing agent is (4-5): 1.
3. the waterborne polyurethane coating as claimed in claim 1, wherein the hydroxyl group content of the waterborne hydroxyl acrylic emulsion is 1.8-2.0% by mass.
4. The waterborne polyurethane coating as claimed in any one of claims 1 to 3, wherein the adhesion promoter is at least one selected from ETERKYD 4901-B-72 and HB 92-3.
5. The aqueous polyurethane coating according to any one of claims 1 to 3, wherein the pigment includes a coloring pigment and an extender pigment.
6. The aqueous polyurethane coating according to any one of claims 1 to 3, wherein the auxiliary is at least one selected from the group consisting of a dispersant, a leveling agent, an antifoaming agent, and a thixotropic auxiliary.
7. The aqueous polyurethane coating according to claim 6,
the dispersant is selected from at least one of TEGO 755W, BYK-190;
the antifoaming agent is selected from at least one of TEGO Airex 901W and TEGO Foamex 810;
the leveling agent is selected from at least one of TEGO Glide 410 and TEGO Glide 4100;
the thixotropic auxiliary agent is at least one selected from Borchi 0620 and RHEOLATE 299.
8. The waterborne polyurethane coating of any one of claims 1 to 3, wherein the cosolvent is at least one selected from dipropylene glycol methyl ether and dipropylene glycol butyl ether.
9. A method for preparing the waterborne polyurethane coating of any one of claims 1 to 8, wherein the method for preparing the first component comprises the following steps:
carrying out first mixing treatment on the pigment and deionized water to obtain a first mixture;
grinding the first mixture to obtain a second mixture;
and carrying out second mixing treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the auxiliary agent and the cosolvent to obtain the first component.
10. The method for producing an aqueous polyurethane coating material according to claim 9,
in the step of carrying out first mixed material treatment on the pigment and the deionized water, carrying out first mixed material treatment on the pigment and the deionized water for 5-10 minutes under the condition of 800-1200 rpm; and/or the presence of a gas in the gas,
and in the step of carrying out second mixed material treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the auxiliary agent and the cosolvent, carrying out second mixed material treatment on the second mixture, the water-based hydroxyl acrylic emulsion, the adhesion promoter, the auxiliary agent and the cosolvent for 15-20 minutes at the condition of 800-1200 rpm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114410203A (en) * | 2022-01-07 | 2022-04-29 | 湖南航天三丰科工有限公司 | Waterborne polyurethane ship coating with high hardness and good water resistance and preparation method thereof |
| CN115710454A (en) * | 2022-11-22 | 2023-02-24 | 广州集泰化工股份有限公司 | Water-based two-component polyurethane coating and preparation method and application thereof |
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| CN110922878A (en) * | 2019-12-17 | 2020-03-27 | 山东七维新材料有限公司 | Water-based high-gloss two-component acrylic polyurethane coating and preparation method thereof |
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| CN103555174A (en) * | 2013-10-23 | 2014-02-05 | 浙江环达漆业集团有限公司 | Preparation method of fouling resistant coating for highway barrier |
| CN108239458A (en) * | 2017-12-19 | 2018-07-03 | 吉力水性新材料科技（珠海）有限公司 | A kind of phosphate modified acrylic acid aqueous antirusting paint of salt fog resistance |
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| CN115710454B (en) * | 2022-11-22 | 2024-04-02 | 广州集泰化工股份有限公司 | Water-based two-component polyurethane coating and preparation method and application thereof |
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Application publication date: 20201204 |