CN113088174A - Water-based two-component polyurethane matte coating and preparation method and application thereof - Google Patents
Water-based two-component polyurethane matte coating and preparation method and application thereof Download PDFInfo
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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
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
- C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention provides a water-based two-component polyurethane matte coating and a preparation method and application thereof, wherein the water-based two-component polyurethane matte coating comprises a component A and a component B, and the preparation raw materials of the component A comprise the following components in parts by weight: 60-90 parts of hydroxyl acrylate emulsion; 5-20 parts of deionized water; 0-30 parts of powder; 0.5-2.5 parts of wetting dispersant; 0.2-2 parts of a thickening agent; 0.2-1 part of a defoaming agent; 0.5-1.5 parts of a preservative; 0.2-2 parts of a film-forming assistant; the component B comprises the following raw materials in parts by weight: 0.1-5 parts of Corsia 307 water-based curing agent. The polyurethane matte coating disclosed by the invention can have a matte effect without additionally adding matting powder, can greatly improve the water resistance, permeability and stability of the coating, and is suitable for the field of coatings.
Description
Technical Field
The invention belongs to the technical field of coatings, relates to a water-based two-component polyurethane matte coating and a preparation method and application thereof, and particularly relates to a self-extinction water-based two-component polyurethane matte coating and a preparation method and application thereof.
Background
With the enhancement of environmental awareness, the limit of national environmental laws and regulations on the emission of Volatile Organic Compounds (VOC) in the coating industry is becoming more and more strict. In particular, in the field of wood lacquer, "oil-to-water" engineering has been implemented in various places. The water-based two-component polyurethane coating has bright application prospect as a high-performance and environment-friendly product. The water-based double-component polyurethane product (2K-WPU) mainly comprises hydroxyl acrylate resin and an isocyanate curing agent, and a cross-linked net structure can be formed between the hydroxyl acrylate resin and the isocyanate curing agent through chemical bonds. Therefore, the performances such as water resistance, adhesion, tensile strength and the like of the product are obviously stronger than those of a single-component product. Meanwhile, the main component of the coating does not contain organic solvent, and zero VOC emission can be really realized.
The 2K-WPU can be subdivided into products such as high gloss, semi-gloss and matte in the coating field, wherein the water-based wood finish has a large amount of matte, generally mainly comprises three-component gloss and five-component gloss, and the more transparent the water-based wood finish can improve the competitiveness of the product. The aqueous matte wood lacquer basically needs to be added with a flatting agent, so that two factors which influence the transparency most importantly are the emulsion and the flatting agent (flatting powder and transparent powder).
Currently, the mainstream matte products in the market are all realized by adding a delustering agent into the formula. The matting agent has the advantages of high matting efficiency, stable effect, low price and no influence on hand feeling. But the method also has the defects that the surfaces of many matting powders are treated by wax, which is beneficial to improving the anti-settling property, but the transparency is poor. The addition of the matting powder greatly affects the water resistance of the coating, so that the use of the matting powder is greatly limited in products with high requirements on water resistance.
A matte emulsion is generally one which is matte after the emulsion is self-formed, and the desired gloss can be achieved without the addition of a matting agent or with a small amount of matting agent. The matting emulsion can better solve the problems brought by matting powder, has small influence on the transparency of the matting effect, and is not good if a proper self-matting emulsion can be found, but related products in the market are not many, mainly the self-matting emulsion has poor gloss stability and high requirements on raw material collocation in the formula.
CN103102792A discloses a water-based two-component polyurethane matte coating which is composed of a component I and a component II. The component one comprises the following raw materials in percentage by mass: hydroxyl acrylic resin, a dispersing agent, a flatting agent, a defoaming agent, a scratch-resistant auxiliary agent, a surface auxiliary agent and matting powder; the second component comprises an isocyanate curing agent. The coating contains an amino ester bond, and has the performances of chemical resistance, high hardness, wear resistance, weather resistance, low gloss and the like. However, the addition of the matting powder in the invention can affect the water resistance of the coating.
Therefore, in the field, the development of a self-extinction aqueous two-component polyurethane matte coating is expected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a water-based two-component polyurethane matte coating and a preparation method and application thereof, and particularly provides a self-extinction water-based two-component polyurethane matte coating and a preparation method and application thereof. The polyurethane matte coating disclosed by the invention can have a matte effect without additionally adding matting powder, and the water resistance, permeability and stability of the coating can be greatly improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a water-based two-component polyurethane matte coating which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
0.1-5 parts of Corsia 307 water-based curing agent.
In the invention, the hydroxyl acrylate emulsion is used in combination with the Corsika 307 water-based curing agent, and the matte effect of the polyurethane coating can be realized by utilizing the difference of the molecular structures of the hydroxyl acrylate emulsion and the curing agent. The hydroxyl acrylic ester emulsion is not a matte emulsion, and is normal gloss when being combined with other curing agents, so that the application range of the hydroxyl acrylic ester emulsion is enlarged. Generally, many matte powder and treatment agent are hydrophilic substances, and have great influence on the water resistance, adhesive force and flexibility of the coating.
In the present invention, the amount of the hydroxy acrylate emulsion used in the preparation of the component a may be 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, or the like.
In the invention, the amount of deionized water used in the raw materials for preparing the component A can be 5 parts, 8 parts, 10 parts, 13 parts, 15 parts, 18 parts or 20 parts.
In the invention, the amount of the powder in the raw materials for preparing the component A can be 0 part, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts or 30 parts. When the amount of the powder is 0 part, namely when the powder is not used, the coating is a varnish product.
In the present invention, the amount of the wetting dispersant used in the preparation raw material of the a component may be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, or the like.
In the present invention, the thickener may be used in an amount of 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.8 parts, 2 parts, or the like in the preparation raw material of the a component.
In the present invention, in the preparation raw material of the a component, the amount of the antifoaming agent may be 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1 part, or the like.
In the present invention, the preservative may be used in an amount of 0.5 parts, 0.7 parts, 0.9 parts, 1 part, 1.3 parts, 1.5 parts, or the like in the preparation raw material of the a component.
In the present invention, the amount of the film-forming aid used in the preparation raw material of the component a may be 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.8 parts, 2 parts or the like.
In the present invention, the amount of the kesichuan 307 water-based curing agent used in the raw materials of the component B may be 0.1 part, 0.5 part, 0.8 part, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or the like.
Preferably, the hydroxy acrylate emulsion has a solids content of 35% to 55%, such as 35%, 40%, 45%, 50%, or 55%, etc., and a hydroxyl content of 2% to 4%, such as 2%, 2.5%, 3%, 3.5%, or 4%, etc.
Preferably, the preparation raw material of the hydroxyl acrylate emulsion comprises the following components in parts by weight:
preferably, the deionized water is used in 80 parts, 100 parts, 120 parts, 140 parts, 160 parts or 180 parts of the raw materials for preparing the hydroxyl acrylate emulsion.
Preferably, in the raw material for preparing the hydroxyl acrylate emulsion, the amount of the emulsifier used may be 1 part, 3 parts, 5 parts, 8 parts, 10 parts or the like.
Preferably, in the raw materials for preparing the hydroxyl acrylate emulsion, the structural monomer can be used in 65 parts, 70 parts, 75 parts, 80 parts or 85 parts.
Preferably, in the raw material for preparing the hydroxyl acrylate emulsion, the amount of the acidic monomer can be 0.5 part, 1 part, 2 parts, 3 parts, 4 parts or 5 parts, etc.
Preferably, in the raw material for preparing the hydroxyl acrylate emulsion, the functional monomer can be used in an amount of 15 parts, 20 parts, 25 parts or 30 parts.
Preferably, the amount of the buffer used in the raw materials for preparing the hydroxy acrylate emulsion may be 0.2 parts, 0.5 parts, 1 part, 2 parts or 3 parts, etc.
Preferably, in the raw materials for preparing the hydroxyl acrylate emulsion, the amount of the initiator can be 1 part, 2 parts or 3 parts.
The preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Uniformly stirring part of deionized water and part of emulsifier, and then adding a structural monomer, an acidic monomer and a functional monomer to obtain a pre-emulsion;
(2) preparation of seed emulsion
Uniformly stirring the rest deionized water, the rest emulsifier and the buffer, adding part of the pre-emulsion prepared in the step (1), then adding part of the initiator, and preserving heat after the reaction solution is blue light to obtain seed emulsion;
(3) emulsion polymerization
And (3) adding the rest of pre-emulsion and the rest of initiator into the seed emulsion obtained in the step (2), heating, reacting, cooling to room temperature, and filtering to obtain the hydroxyl acrylate emulsion.
Preferably, the emulsifier comprises any one of ABEX VA-50, ABEX8028, DS-4, RS-610 or LA40-S or a combination of at least two thereof.
Preferably, the structural monomer comprises any one of methyl methacrylate, butyl methacrylate, isobutyl methacrylate, butyl acrylate, acrylonitrile, acrylamide, styrene or 2-isooctyl acrylate or a combination of at least two thereof.
Preferably, the acidic monomer comprises any one of acrylic acid, methacrylic acid, crotonic acid, fumaric acid, itaconic acid, citraconic acid or maleic anhydride, or a combination of at least two thereof.
Preferably, the functional monomer comprises hydroxypropyl methacrylate and/or hydroxyethyl methacrylate.
Preferably, the buffer comprises any one of sodium carbonate, sodium bicarbonate, disodium hydrogen phosphate or sodium dihydrogen phosphate, or a combination of at least two thereof.
Preferably, the initiator comprises ammonium persulfate and/or potassium persulfate.
Preferably, the part of deionized water in the step (1) is 30 parts of deionized water.
Preferably, the partial emulsifier in the step (1) is 0.5 part of emulsifier.
Preferably, the rotation speed of the stirring in the step (1) is 100-500 rpm, such as 100rpm, 200rpm, 300rpm, 400rpm or 500 rpm.
Preferably, step (2) is carried out under protection of a protective gas.
Preferably, the protective gas is nitrogen.
Preferably, the adding part of the pre-emulsion prepared in the step (1) in the step (2) is adding 1-30 parts (for example, 1 part, 10 parts, 20 parts or 30 parts and the like) of the pre-emulsion.
Preferably, the adding part of the initiator in the step (2) is adding 0.5 part of the initiator.
Preferably, the heat preservation in the step (2) is performed for 10-30 min, such as 10min, 20min or 30 min.
Preferably, the temperature rise in the step (3) is to 80 ℃.
Preferably, the reaction time in the step (3) is 3-4 h, such as 3h, 3.5h or 4 h.
Preferably, the filtration in the step (3) is filtration by a 200-mesh filter screen.
As a preferred technical scheme of the invention, the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
0.1-5 parts of Corsia 307 water-based curing agent.
Preferably, the powder comprises rutile titanium dioxide.
Preferably, the particle size of the rutile type titanium dioxide is 500-2000 meshes, such as 500 meshes, 800 meshes, 1000 meshes, 1300 meshes, 1500 meshes, 1800 meshes, 2000 meshes and the like.
Preferably, the wetting dispersant comprises any one or a combination of at least two of polyacrylate dispersant, polyurethane dispersant, polyamide dispersant or long-chain fatty acid dispersant.
Preferably, the thickener comprises a polyacrylate and/or polyacrylate, preferably a polyacrylate.
Preferably, the defoamer comprises any one of or a combination of at least two of nonionic polysiloxane, modified polysiloxane mixture, fatty acid defoamer or fatty acid ester defoamer, preferably nonionic polysiloxane or modified polysiloxane mixture.
Preferably, the preservative comprises any one or a combination of at least two of an isothiazolinone preservative, polyhexamethylene biguanide hydrochloride or imidazolidinyl urea, preferably an isothiazolinone preservative.
Preferably, the coalescent comprises any one or a combination of at least two of propylene glycol methyl ether acetate, propylene glycol diacetate, dipropylene glycol butyl ether, or dipropylene glycol methyl ether, preferably propylene glycol methyl ether acetate.
In another aspect, the invention provides a preparation method of the water-based two-component polyurethane matte coating, which comprises the following steps:
(1) stirring the hydroxyl acrylate emulsion, the wetting dispersant and the defoaming agent to obtain a first mixture;
(2) sequentially adding powder and a film-forming aid into the first mixture obtained in the step (1), and stirring to obtain a second mixture;
(3) sequentially adding a thickening agent and a preservative into the second mixture obtained in the step (2), and stirring to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Preferably, the rotation speed of the stirring in the step (1) is 100-500 rpm, such as 100rpm, 200rpm, 300rpm, 400rpm or 500 rpm.
Preferably, the rotation speed of the stirring in the step (2) is 400rpm, and the stirring time is 20 min.
Preferably, the rotation speed of the stirring in the step (3) is 400rpm, and the stirring time is 20 min.
Preferably, the filtration in the step (4) adopts gauze, and the mesh number of the gauze is 200 meshes.
As a preferred technical scheme of the invention, deionized water is added in the step (4) for adjusting the viscosity.
The component B in the invention is a commercial product.
In a further aspect, the invention provides the use of the aqueous two-component polyurethane matte coating as described above in coatings.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the hydroxyl acrylate emulsion and the CorsiChuan 307 water-based curing agent are cooperatively used, so that the prepared polyurethane coating has a matte effect (the glossiness is 13-35 degrees), and the glossiness of the polyurethane coating can be controlled by adjusting the hydroxyl content of the hydroxyl acrylate emulsion. The invention does not need to add flatting powder, avoids powder sedimentation and can reduce cost;
(2) the hydroxyl acrylic ester emulsion is not a matte emulsion, is normal gloss when being combined with other curing agents, and increases the application range of the hydroxyl acrylic ester emulsion. The matte effect of the polyurethane coating is realized by utilizing the difference of molecular structures of the hydroxyl acrylate emulsion and the curing agent;
(3) compared with the conventional polyurethane matte coating added with the matte powder and the treating agent, the polyurethane matte coating has the advantages that the water resistance (4.5-6h), the adhesive force (0 level) and the flexibility are greatly improved.
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. In the following examples, unless otherwise specified, the experimental methods used were all conventional methods, and materials, reagents and the like used were all available from chemical companies.
Example 1
The embodiment provides a water-based two-component polyurethane matte coating, which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
0.1 part of CorsiChuan 307 water-based curing agent.
Wherein the solid content of the hydroxyl acrylate emulsion is 35 percent, the hydroxyl content is 2 percent, and the particle size of the rutile type titanium dioxide is 500 meshes.
The hydroxyl acrylate emulsion is prepared from the following raw materials in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Putting 30 parts of deionized water and 0.5 part of emulsifier into a pre-emulsification bottle, uniformly stirring at the rotating speed of 100rpm, and then adding a structural monomer, an acidic monomer and a functional monomer to form a milky pre-emulsion for later use;
(2) preparation of seed emulsion
Under the nitrogen atmosphere, filling the residual deionized water, the residual emulsifier and the buffer into a reaction bottle with a mechanical stirring device, a thermometer and a reflux condenser tube, placing the reaction bottle in an oil bath pot at a certain temperature, adding 1 part of the pre-emulsion prepared in the step (1) into the reaction bottle, then adding 0.5 part of an initiator, and preserving the temperature for 20min after the reaction liquid is blue light to obtain a seed emulsion;
(3) emulsion polymerization
And (3) dropwise adding the residual pre-emulsion and the residual initiator into the seed emulsion obtained in the step (2), heating to 80 ℃ after the dropwise adding is finished, reacting for 3 hours, cooling the liquid in the reaction bottle to room temperature, and filtering by using a 200-mesh filter screen to obtain the hydroxyl acrylate emulsion.
The preparation method of the water-based two-component polyurethane matte coating comprises the following steps:
(1) uniformly stirring hydroxyl acrylate emulsion, polyacrylate dispersant and nonionic polysiloxane at the rotating speed of 100rpm to obtain a first mixture;
(2) adding rutile titanium dioxide into the first mixture obtained in the step (1), then adding propylene glycol methyl ether acetate, and stirring at the rotating speed of 400rpm for 20min to obtain a second mixture;
(3) sequentially adding polyacrylate and isothiazolinone preservatives into the second mixture obtained in the step (2), and stirring at the rotating speed of 400rpm for 20min to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering and discharging the mixture by using 200-mesh gauze to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Example 2
The embodiment provides a water-based two-component polyurethane matte coating, which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
5 parts of CorsiChuan 307 water-based curing agent.
Wherein the solid content of the hydroxy acrylic ester emulsion is 55 percent, the hydroxyl content is 4 percent, and the particle size of the rutile type titanium dioxide is 1000 meshes.
The hydroxyl acrylate emulsion is prepared from the following raw materials in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Putting 30 parts of deionized water and 0.5 part of emulsifier into a pre-emulsification bottle, uniformly stirring at the rotating speed of 200rpm, and then adding a structural monomer, an acidic monomer and a functional monomer to form a milky pre-emulsion for later use;
(2) preparation of seed emulsion
Under the nitrogen atmosphere, filling the residual deionized water, the residual emulsifier and the buffer into a reaction bottle with a mechanical stirring device, a thermometer and a reflux condenser tube, placing the reaction bottle in an oil bath pot at a certain temperature, adding 5 parts of the pre-emulsion prepared in the step (1) into the reaction bottle, then adding 0.5 part of an initiator, and preserving the temperature for 20min after the reaction liquid is blue light to obtain a seed emulsion;
(3) emulsion polymerization
And (3) dropwise adding the residual pre-emulsion and the residual initiator into the seed emulsion obtained in the step (2), heating to 80 ℃ after the dropwise adding is finished, reacting for 3 hours, cooling the liquid in the reaction bottle to room temperature, and filtering by using a 200-mesh filter screen to obtain the hydroxyl acrylate emulsion.
The preparation method of the water-based two-component polyurethane matte coating comprises the following steps:
(1) uniformly stirring a mixture of hydroxyl acrylate emulsion, a polyurethane dispersant and modified polysiloxane at the rotating speed of 200rpm to obtain a first mixture;
(2) adding rutile titanium dioxide into the first mixture obtained in the step (1), then adding propylene glycol diacetate, and stirring at the rotating speed of 400rpm for 20min to obtain a second mixture;
(3) sequentially adding polyacrylate and polyhexamethylene biguanide hydrochloride into the second mixture obtained in the step (2), and stirring at the rotating speed of 400rpm for 20min to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering and discharging the mixture by using 200-mesh gauze to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Example 3
The embodiment provides a water-based two-component polyurethane matte coating, which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
0.5 part of CorsiChuan 307 water-based curing agent.
Wherein the solid content of the hydroxyl acrylate emulsion is 55 percent, and the hydroxyl content is 3 percent.
The hydroxyl acrylate emulsion is prepared from the following raw materials in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Putting 30 parts of deionized water and 0.5 part of emulsifier into a pre-emulsification bottle, uniformly stirring at the rotating speed of 300rpm, and then adding a structural monomer, an acidic monomer and a functional monomer to form a milky pre-emulsion for later use;
(2) preparation of seed emulsion
Under the nitrogen atmosphere, loading the residual deionized water, the residual emulsifier and the buffer into a reaction bottle with a mechanical stirring device, a thermometer and a reflux condenser tube, placing the reaction bottle in an oil bath pot at a certain temperature, adding 10 parts of the pre-emulsion prepared in the step (1) into the reaction bottle, then adding 0.5 part of an initiator, and preserving the temperature for 10min after the reaction liquid is blue light to obtain a seed emulsion;
(3) emulsion polymerization
And (3) dropwise adding the residual pre-emulsion and the residual initiator into the seed emulsion obtained in the step (2), heating to 80 ℃ after the dropwise adding is finished, reacting for 3.5 hours, cooling the liquid in the reaction bottle to room temperature, and filtering by using a 200-mesh filter screen to obtain the hydroxyl acrylate emulsion.
The preparation method of the water-based two-component polyurethane matte coating comprises the following steps:
(1) uniformly stirring the hydroxyl acrylate emulsion, the polyamide dispersant and the fatty acid defoaming agent at the rotating speed of 300rpm to obtain a first mixture;
(2) adding dipropylene glycol butyl ether into the first mixture obtained in the step (1), and stirring at the rotating speed of 400rpm for 20min to obtain a second mixture;
(3) sequentially adding polyacrylate and imidazolidinyl urea into the second mixture obtained in the step (2), and stirring at the rotating speed of 400rpm for 20min to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering and discharging the mixture by using 200-mesh gauze to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Example 4
The embodiment provides a water-based two-component polyurethane matte coating, which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
1 part of Corsichuang 307 water-based curing agent.
Wherein, the solid content of the hydroxyl acrylate emulsion is 40 percent, the hydroxyl content is 3.5 percent, and the particle size of the rutile type titanium dioxide is 2000 meshes.
The hydroxyl acrylate emulsion is prepared from the following raw materials in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Putting 30 parts of deionized water and 0.5 part of emulsifier into a pre-emulsification bottle, uniformly stirring at the rotating speed of 400rpm, and then adding a structural monomer, an acidic monomer and a functional monomer to form a milky pre-emulsion for later use;
(2) preparation of seed emulsion
Under the nitrogen atmosphere, filling the residual deionized water, the residual emulsifier and the buffer into a reaction bottle with a mechanical stirring device, a thermometer and a reflux condenser tube, placing the reaction bottle in an oil bath pot at a certain temperature, adding 30 parts of the pre-emulsion prepared in the step (1) into the reaction bottle, then adding 0.5 part of an initiator, and preserving the temperature for 10min after the reaction liquid is blue light to obtain a seed emulsion;
(3) emulsion polymerization
And (3) dropwise adding the residual pre-emulsion and the residual initiator into the seed emulsion obtained in the step (2), heating to 80 ℃ after the dropwise adding is finished, reacting for 3.5 hours, cooling the liquid in the reaction bottle to room temperature, and filtering by using a 200-mesh filter screen to obtain the hydroxyl acrylate emulsion.
The preparation method of the water-based two-component polyurethane matte coating comprises the following steps:
(1) uniformly stirring the hydroxyl acrylate emulsion, the long-chain fatty acid dispersant and the fatty acid ester defoaming agent at the rotating speed of 400rpm to obtain a first mixture;
(2) adding rutile titanium dioxide into the first mixture obtained in the step (1), then adding dipropylene glycol methyl ether, and stirring at the rotating speed of 400rpm for 20min to obtain a second mixture;
(3) sequentially adding polyacrylate and isothiazolinone preservatives into the second mixture obtained in the step (2), and stirring at the rotating speed of 400rpm for 20min to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering and discharging the mixture by using 200-mesh gauze to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Example 5
The embodiment provides a water-based two-component polyurethane matte coating, which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
3 parts of CorsiChuan 307 water-based curing agent.
Wherein the solid content of the hydroxyl acrylate emulsion is 50 percent, the hydroxyl content is 4 percent, and the particle size of the rutile type titanium dioxide is 800 meshes.
The hydroxyl acrylate emulsion is prepared from the following raw materials in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Putting 30 parts of deionized water and 0.5 part of emulsifier into a pre-emulsification bottle, uniformly stirring at the rotating speed of 500rpm, and then adding a structural monomer, an acidic monomer and a functional monomer to form a milky pre-emulsion for later use;
(2) preparation of seed emulsion
Under the nitrogen atmosphere, filling the residual deionized water, the residual emulsifier and the buffer into a reaction bottle with a mechanical stirring device, a thermometer and a reflux condenser tube, placing the reaction bottle in an oil bath pot at a certain temperature, adding 20 parts of the pre-emulsion prepared in the step (1) into the reaction bottle, then adding 0.5 part of an initiator, and preserving the temperature for 30min after the reaction liquid is blue light to obtain a seed emulsion;
(3) emulsion polymerization
And (3) dropwise adding the residual pre-emulsion and the residual initiator into the seed emulsion obtained in the step (2), after the dropwise adding is finished, heating to 80 ℃, reacting for 4 hours, then cooling the liquid in the reaction bottle to room temperature, and filtering by using a 200-mesh filter screen to obtain the hydroxyl acrylate emulsion.
The preparation method of the water-based two-component polyurethane matte coating comprises the following steps:
(1) uniformly stirring a mixture of hydroxyl acrylate emulsion, a polyacrylate dispersant and modified polysiloxane at a rotating speed of 500rpm to obtain a first mixture;
(2) adding rutile type titanium dioxide into the first mixture obtained in the step (1), adding dipropylene glycol butyl ether, and stirring at the rotating speed of 400rpm for 20min to obtain a second mixture;
(3) sequentially adding polyacrylate and polyhexamethylene biguanide hydrochloride into the second mixture obtained in the step (2), and stirring at the rotating speed of 400rpm for 20min to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering and discharging the mixture by using 200-mesh gauze to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Example 6
The embodiment provides a water-based two-component polyurethane matte coating, which comprises a component A and a component B, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
and 4 parts of scientific wound 307 water-based curing agent.
Wherein the solid content of the hydroxyl acrylate emulsion is 45 percent, the hydroxyl content is 3.5 percent, and the particle size of the rutile type titanium dioxide is 1200 meshes.
The hydroxyl acrylate emulsion is prepared from the following raw materials in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Putting 30 parts of deionized water and 0.5 part of emulsifier into a pre-emulsification bottle, uniformly stirring at the rotating speed of 300rpm, and then adding a structural monomer, an acidic monomer and a functional monomer to form a milky pre-emulsion for later use;
(2) preparation of seed emulsion
Under the nitrogen atmosphere, filling the residual deionized water, the residual emulsifier and the buffer into a reaction bottle with a mechanical stirring device, a thermometer and a reflux condenser tube, placing the reaction bottle in an oil bath pot at a certain temperature, adding 25 parts of the pre-emulsion prepared in the step (1) into the reaction bottle, then adding 0.5 part of an initiator, and preserving the temperature for 30min after the reaction liquid is blue light to obtain a seed emulsion;
(3) emulsion polymerization
And (3) dropwise adding the residual pre-emulsion and the residual initiator into the seed emulsion obtained in the step (2), after the dropwise adding is finished, heating to 80 ℃, reacting for 4 hours, then cooling the liquid in the reaction bottle to room temperature, and filtering by using a 200-mesh filter screen to obtain the hydroxyl acrylate emulsion.
The preparation method of the water-based two-component polyurethane matte coating comprises the following steps:
(1) uniformly stirring the hydroxyl acrylate emulsion, the polyurethane dispersant and the nonionic polysiloxane at the rotating speed of 300rpm to obtain a first mixture;
(2) adding rutile titanium dioxide into the first mixture obtained in the step (1), then adding dipropylene glycol methyl ether, and stirring at the rotating speed of 400rpm for 20min to obtain a second mixture;
(3) sequentially adding polyacrylate and imidazolidinyl urea into the second mixture obtained in the step (2), and stirring at the rotating speed of 400rpm for 20min to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering and discharging the mixture by using 200-mesh gauze to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
Example 7
This example differs from example 1 only in that the hydroxyl content of the hydroxyacrylate emulsion in the starting material for the preparation of component A is 1%.
Comparative example 1
This comparative example differs from example 1 only in that the hydroxyacrylate emulsion in the starting material for the preparation of component A was replaced by the same amount of PA 4816.
Comparative example 2
The comparative example is different from example 1 only in that the amount of the aqueous curing agent of the raw material Corsia 307 in the component B is replaced by the same amount of the Corsia 2655 curing agent.
The aqueous two-component polyurethane matt coatings of examples 1 to 7 and comparative examples 1 to 2 were subjected to a performance test according to the following method:
(1) and (3) testing the adhesive force: the test was carried out according to the method of GB/T9286-1998;
(2) and (3) testing the glossiness: the test was carried out according to the method of GB/T9754-2007;
(3) and (3) testing water resistance: pouring boiling water to the surface of a paint film formed by the water-based double-component polyurethane matte paint, reversely buckling a disposable plastic cup to keep moisture, and observing the whitening time of the paint film;
(4) and (3) hardness testing: the test was carried out according to the method of GB/T6739-2006.
The results of the performance tests are shown in table 1.
TABLE 1
| Adhesion (grade) | Glossiness (degree) | Water resistance (h) | Hardness of | |
| Example 1 | 0 | 35 | 4.5 | H |
| Example 2 | 0 | 13 | 6 | 3H |
| Example 3 | 0 | 26 | 4.6 | 2H |
| Example 4 | 0 | 24 | 5 | 2H |
| Example 5 | 0 | 15 | 6 | 3H |
| Example 6 | 0 | 28 | 5 | H |
| Example 7 | 2 | 40 | 3 | HB |
| Comparative example 1 | 0 | 80 | 4.5 | 2H |
| Comparative example 2 | 0 | 77 | 5 | 2H |
As can be seen from Table 1, the aqueous two-component polyurethane matt coatings prepared in examples 1 to 6 have good adhesion (0 th), matt effect (gloss: 13 to 35 degrees), good water resistance (4.5 to 6H) and good hardness (H-3H).
The aqueous two-component polyurethane matte coating prepared in example 7 had poor adhesion, water resistance and hardness, and the matte effect was poor, compared to example 1.
Compared with example 1, the matte effect of the aqueous two-component polyurethane matte coatings prepared in comparative examples 1 and 2 disappears, and normal gloss is exhibited.
The applicant states that the present invention is illustrated by the above examples of the aqueous two-component polyurethane matt coating and the preparation method and application thereof, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by means of the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The water-based two-component polyurethane matte coating is characterized by comprising a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
0.1-5 parts of Corsia 307 water-based curing agent.
2. The aqueous two-component polyurethane matte coating according to claim 1, wherein the hydroxyl acrylate emulsion has a solid content of 35-55% and a hydroxyl content of 2-4%.
3. The water-based two-component polyurethane matte coating according to claim 1 or 2, wherein the hydroxyl acrylate emulsion is prepared from the following components in parts by weight:
the preparation method of the hydroxyl acrylate emulsion comprises the following steps:
(1) preparation of the Pre-emulsion
Uniformly stirring part of deionized water and part of emulsifier, and then adding a structural monomer, an acidic monomer and a functional monomer to obtain a pre-emulsion;
(2) preparation of seed emulsion
Uniformly stirring the rest deionized water, the rest emulsifier and the buffer, adding part of the pre-emulsion prepared in the step (1), then adding part of the initiator, and preserving heat after the reaction solution is blue light to obtain seed emulsion;
(3) emulsion polymerization
And (3) adding the rest of pre-emulsion and the rest of initiator into the seed emulsion obtained in the step (2), heating, reacting, cooling to room temperature, and filtering to obtain the hydroxyl acrylate emulsion.
4. The aqueous two-component polyurethane matte coating according to claim 3, wherein the emulsifier comprises any one or a combination of at least two of ABEX VA-50, ABEX8028, DS-4, RS-610 or LA 40-S;
preferably, the structural monomer comprises any one or a combination of at least two of methyl methacrylate, butyl methacrylate, isobutyl methacrylate, butyl acrylate, acrylonitrile, acrylamide, styrene or 2-isooctyl acrylate;
preferably, the acidic monomer comprises any one of acrylic acid, methacrylic acid, crotonic acid, fumaric acid, itaconic acid, citraconic acid or maleic anhydride or a combination of at least two thereof;
preferably, the functional monomer comprises hydroxypropyl methacrylate and/or hydroxyethyl methacrylate;
preferably, the buffer comprises any one or a combination of at least two of sodium carbonate, sodium bicarbonate, disodium hydrogen phosphate, or sodium dihydrogen phosphate;
preferably, the initiator comprises ammonium persulfate and/or potassium persulfate.
5. The aqueous two-component polyurethane matte coating according to claim 3 or 4, wherein the part of deionized water in step (1) is 30 parts of deionized water;
preferably, the partial emulsifier in the step (1) is 0.5 part of emulsifier;
preferably, the rotating speed of the stirring in the step (1) is 100-500 rpm;
preferably, step (2) is carried out under the protection of protective gas;
preferably, the protective gas is nitrogen;
preferably, the adding part of the pre-emulsion prepared in the step (1) in the step (2) is adding 1-30 parts of pre-emulsion;
preferably, the adding part of the initiator in the step (2) is adding 0.5 part of the initiator;
preferably, the heat preservation in the step (2) is heat preservation for 10-30 min;
preferably, the temperature rise in the step (3) is to rise to 80 ℃;
preferably, the reaction time in the step (3) is 3-4 h;
preferably, the filtration in the step (3) is filtration by a 200-mesh filter screen.
6. The water-based two-component polyurethane matte coating according to any one of claims 1-5, wherein the preparation raw material of the component A comprises the following components in parts by weight:
the component B comprises the following raw materials in parts by weight:
0.1-5 parts of Corsia 307 water-based curing agent.
7. The aqueous two-component polyurethane matte coating according to any one of claims 1-6, wherein the powder comprises rutile titanium dioxide;
preferably, the particle size of the rutile type titanium dioxide is 500-2000 meshes;
preferably, the wetting dispersant comprises any one or a combination of at least two of polyacrylate dispersant, polyurethane dispersant, polyamide dispersant or long-chain fatty acid dispersant, preferably polyacrylate dispersant;
preferably, the thickener comprises a polyacrylate and/or polyacrylate, preferably a polyacrylate;
preferably, the defoamer comprises any one of or a combination of at least two of nonionic polysiloxane, modified polysiloxane mixture, fatty acid defoamer or fatty acid ester defoamer, preferably nonionic polysiloxane or modified polysiloxane mixture;
preferably, the preservative comprises any one or a combination of at least two of an isothiazolinone preservative, polyhexamethylene biguanide hydrochloride or imidazolidinyl urea, preferably an isothiazolinone preservative;
preferably, the coalescent comprises any one or a combination of at least two of propylene glycol methyl ether acetate, propylene glycol diacetate, dipropylene glycol butyl ether, or dipropylene glycol methyl ether, preferably propylene glycol methyl ether acetate.
8. Method for the preparation of an aqueous two-component polyurethane matte coating according to any of claims 1-7, characterized in that it comprises the following steps:
(1) stirring the hydroxyl acrylate emulsion, the wetting dispersant and the defoaming agent to obtain a first mixture;
(2) sequentially adding powder and a film-forming aid into the first mixture obtained in the step (1), and stirring to obtain a second mixture;
(3) sequentially adding a thickening agent and a preservative into the second mixture obtained in the step (2), and stirring to obtain a third mixture;
(4) adding deionized water into the third mixture obtained in the step (3), and filtering to obtain a component A;
(5) and uniformly mixing the component A and the component B to obtain the water-based double-component polyurethane matte coating.
9. The preparation method according to claim 8, wherein the rotation speed of the stirring in the step (1) is 100 to 500 rpm;
preferably, the rotation speed of the stirring in the step (2) is 400rpm, and the stirring time is 20 min;
preferably, the rotation speed of the stirring in the step (3) is 400rpm, and the stirring time is 20 min;
preferably, the filtration in the step (4) adopts gauze, and the mesh number of the gauze is 200 meshes.
10. Use of the aqueous two-component polyurethane matte coating according to any of claims 1-7 in coatings.
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