CN115433482A - Preparation method of water-resistant coating of water-based polyurethane - Google Patents
Preparation method of water-resistant coating of water-based polyurethane Download PDFInfo
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- CN115433482A CN115433482A CN202211235735.3A CN202211235735A CN115433482A CN 115433482 A CN115433482 A CN 115433482A CN 202211235735 A CN202211235735 A CN 202211235735A CN 115433482 A CN115433482 A CN 115433482A
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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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
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
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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
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
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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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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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
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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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
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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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
- C08G2150/00—Compositions for coatings
- C08G2150/90—Compositions for anticorrosive coatings
Abstract
The invention discloses a preparation method of a water-based polyurethane water-resistant coating, belongs to the technical field of preparation of anticorrosive coatings, solves the problem of insufficient water resistance of the existing water-based polyurethane coating in anticorrosive property, and adopts the following specific technical scheme: the preparation method comprises two steps of preparation of a water-based coating and preparation of an anticorrosive coating, wherein the coating takes water-based polyurethane as a main matrix, the first step comprises preparation of a prepolymer of an emulsion and the water-based emulsion, and the second step is preparation of the anticorrosive coating.
Description
Technical Field
The invention belongs to the technical field of preparation of anticorrosive coatings, and particularly relates to a preparation method of a high polymer material and a waterborne polyurethane coating.
Background
The polyurethane paint is one-component waterproof polyurethane paint prepared with isocyanate group-containing prepolymer prepared through the addition polymerization of oligomer dihydric alcohol, diisocyanate, etc. and catalyst, leveling agent, defoaming agent, solvent, etc. and through mixing and other steps. The coating film has beautiful appearance, good decoration, and has been widely applied to the fields of buildings, bridges, concrete engineering and the like due to the characteristics of good flexibility, impact resistance, corrosion resistance, chemical resistance, excellent low temperature resistance and the like.
Compared with the traditional solvent-based coating, the water-based coating is more environment-friendly, safer, less in pollution, lower in raw material cost, convenient to use and very wide in application prospect. The water-based polyurethane coating is one of water-based coatings, and is structurally characterized in that hydrophilic groups are introduced into molecular chains of polyurethane, so that the water-based polyurethane coating has self-emulsifying capacity. The existence of hydrophilic groups has influence on the surface performance and long-term stability of the coating, and meanwhile, the water-based coating has long curing time, low film-forming strength and insufficient water resistance, thereby restricting the application range of the water-based coating.
Disclosure of Invention
In order to solve the technical problem that the water resistance of the existing waterborne polyurethane coating is insufficient in corrosion resistance, the invention provides a preparation method of a waterborne polyurethane water-resistant coating.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a preparation method of a water-based polyurethane water-resistant coating comprises two steps of preparing a water-based polyurethane emulsion and preparing an anticorrosive coating;
1. the preparation method of the waterborne polyurethane emulsion comprises the following specific steps:
1.1, preparation of a water-based paint prepolymer: dehydrating and pretreating oligomer polyol in a vacuum drying oven under the heating condition to obtain oligomer dihydric alcohol; adding a catalyst, and reacting 30-45 parts of oligomer dihydric alcohol with 30-40 parts of diisocyanate at 70 ℃ under the condition of inert gas until the oligomer dihydric alcohol completely reacts; adding 2-6 parts of hydrophilic chain extender, reacting for 2.5h at 80 ℃, continuously adding 1-10 parts of cross-linking agent, reacting for 1h, adding an organic solvent to reduce the viscosity of the system, and reducing the viscosity of the system to ensure that mechanical stirring can normally run to obtain a waterborne polyurethane prepolymer;
1.2, preparing the aqueous polyurethane emulsion: adding 0.05 to 0.15 part of polymerization inhibitor and 5 to 25 parts of end capping agent into the waterborne polyurethane prepolymer, reacting for 3 hours at 60 ℃, cooling to 50 ℃, and adding 2 to 6 parts of neutralizer for reaction to obtain an end capping prepolymer; and adding deionized water into the end-capped prepolymer to ensure that the solid content of the emulsion accounts for 30% of the total mass of the emulsion, stirring at a high speed until the mixture is emulsified and dispersed, and distilling under reduced pressure to remove the organic solvent in the reactant to finally obtain the waterborne polyurethane emulsion.
2. The preparation method of the anticorrosive coating comprises the following specific steps:
2.1, drying: adding a photoinitiator accounting for 4wt% of the end-capped prepolymer into the aqueous polyurethane emulsion, uniformly mixing, placing the mixture into a polytetrafluoroethylene mold, standing for two days at room temperature, and fully drying;
2.2, photocuring and crosslinking: and (3) placing the fully dried polytetrafluoroethylene mold under an ultraviolet lamp of 200-1000W, irradiating for 15min for curing and crosslinking, and taking out after film forming to obtain the waterproof coating with the multiple crosslinking and corrosion prevention functions.
The oligomer dihydric alcohol is one or the combination of any more of polyester polyol, polyether polyol, polyolefin polyol, vegetable oil polyol and epoxy resin polyol with the molecular weight of 500-3000.
The diisocyanate is one or the combination of any more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate and hexamethylene diisocyanate.
The hydrophilic chain extender is one or the combination of any more of dimethylolpropionic acid, dimethylolbutyric acid, ethylene diamine ethyl sodium sulfonate, N-methyldiethanolamine and triethanolamine.
The catalyst is organic tin reagent or tertiary amine catalyst.
The cross-linking agent is one or the combination of any more of trimethylolpropane and castor oil.
The polymerization inhibitor is one or the combination of any more of p-methoxyphenol and hydroquinone.
The end capping agent is one or the combination of any more of hydroxyethyl methacrylate, hydroxypropyl methacrylate, pentaerythritol diacrylate and pentaerythritol triacrylate.
The neutralizer is one or the combination of any more of triethylamine, ammonia water and sodium hydroxide.
The photoinitiator is one or the combination of more of a photoinitiator 2959, benzophenone and 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, and the mass ratio of the photoinitiator to the end-capping prepolymer in the emulsion is 1-5%.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the polyurethane chain structure is modified by using the acrylate and the castor oil simultaneously, and the acrylate and the castor oil supplement each other, so that the storage stability of the water-based paint is improved.
2. According to the invention, the chain polyurethane molecule is terminated by using the acrylate with double bonds, and the double bonds are subjected to crosslinking action through ultraviolet light curing, so that the internal crosslinking degree of the coating is increased, the anti-corrosion property of the coating for protecting metal is improved, and the production efficiency is higher.
3. The waterborne polyurethane coating finally prepared by the invention also has excellent performances in the aspects of water resistance and mechanical strength.
Drawings
FIG. 1 is a reaction scheme of the present invention.
FIG. 2 is a comparison table of surface hardness, adhesion and transmittance of the water-resistant coating prepared by the present invention.
FIG. 3 is a graph comparing the tensile properties of water-resistant coatings made according to the present invention.
FIG. 4 is a comparison of water absorption of the water-resistant coating prepared according to the present invention.
FIG. 5 is a comparison of water contact angles of water-resistant coatings made according to the present invention.
FIG. 6 is a polarization curve diagram of the water-resistant coating prepared by the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in figure 1, the preparation method of the waterborne polyurethane water-resistant coating comprises two steps of waterborne polyurethane emulsion preparation and anticorrosive coating preparation;
example one
1. Preparation of aqueous polyurethane emulsion
I. Preparing a waterborne polyurethane prepolymer: 13.43mmol of polycarbonate diol (PCDL-1000) is subjected to dehydration pretreatment, then 25mmol of isophorone diisocyanate is added, and a catalytic amount of dibutyltin dilaurate is added to react for 2 hours at 70 ℃; 5.8mmol portions of dimethylolpropionic acid (DMPA) were added and reacted for 2.5h at 80 ℃.
II, preparing emulsion; preparing 11.5mmol of pentaerythritol triacrylate, adding the pentaerythritol triacrylate into the prepolymer for reaction, and reacting at 60 ℃ for 3 hours; then cooling to 50 ℃, adding 5.8mmol of triethylamine for neutralization reaction, wherein the reaction time is 0.5 h; adding 55.48ml deionized water, and increasing the mechanical stirring speed to 1000 r/min for emulsifying for 20 min; finally obtaining the aqueous polyurethane emulsion.
(2) Preparation of photo-cured polyurethane film
I. And (3) drying: adding a light curing agent 2959 accounting for 4% of the solid content of the emulsion into the prepared emulsion, uniformly mixing, placing the mixture into a polytetrafluoroethylene mold, and standing the mixture at room temperature for 48 hours;
II. And (3) photocuring: and (3) placing the emulsion after standing under a 35w ultraviolet lamp for photocuring for 15min, and taking out after film forming to obtain the final ultraviolet-cured waterborne polyurethane coating.
Finally, the waterborne polyurethane coating with the castor oil content of 0% is successfully prepared.
Example two
1. Preparation of aqueous polyurethane emulsion
I. Preparing a waterborne polyurethane prepolymer: 11.3mmol of polycarbonate diol (PCDL-1000) is subjected to dehydration pretreatment, then 25mmol of isophorone diisocyanate is added, and a catalytic amount of dibutyltin dilaurate is added to react for 2 h at 70 ℃; adding 5.8mmol of dimethylolpropionic acid (DMPA) to react at 80 ℃ for 2.5h; adding 1.42mmol of castor oil, and reacting at 70 deg.C for 1 h; and 2ml of acetone is added to reduce the viscosity of the reaction system, and the viscosity of the system is reduced to ensure that the mechanical stirring can normally operate.
II, preparing emulsion; preparing 11.5mmol of pentaerythritol triacrylate, adding the pentaerythritol triacrylate into the prepolymer for reaction, and reacting at 60 ℃ for 3 h; then cooling to 50 ℃, adding 5.8mmol of triethylamine for neutralization reaction, wherein the reaction time is 0.5 h; adding 51.54ml deionized water, and increasing the mechanical stirring speed to 1000 r/min for emulsifying for 20 min; and finally removing acetone in the system to obtain the aqueous polyurethane emulsion.
(2) Preparation of photo-cured polyurethane film
I, drying: adding a light curing agent 2959 accounting for 4% of the solid content of the emulsion into the prepared emulsion, uniformly mixing, placing the mixture into a polytetrafluoroethylene mold, and standing the mixture at room temperature for 48 hours;
II, photocuring: and (3) placing the emulsion after standing under a 35w ultraviolet lamp for photocuring for 15min, and taking out after film forming to obtain the final ultraviolet-cured waterborne polyurethane coating.
Finally, the waterborne polyurethane coating with the castor oil content of 2% is successfully prepared.
EXAMPLE III
1. Preparation of aqueous polyurethane emulsion
I. Preparing a waterborne polyurethane prepolymer: 9.45mmol of polycarbonate diol (PCDL-1000) is subjected to dehydration pretreatment, then 25mmol of isophorone diisocyanate is added, and a catalytic amount of dibutyltin dilaurate is added to react for 2 hours at 70 ℃; adding 5.8mmol parts of dimethylolpropionic acid (DMPA) to react for 2.5h at 80 ℃; then adding 2.65mmol of castor oil to react for 1 hour at 70 ℃; and 2ml of acetone is added to reduce the viscosity of the reaction system, and the viscosity of the system is reduced to ensure that the mechanical stirring can normally operate.
II, preparing emulsion; preparing 11.5mmol of pentaerythritol triacrylate, adding the pentaerythritol triacrylate into the prepolymer for reaction, and reacting at 60 ℃ for 3 hours; then cooling to 50 ℃, adding 5.8mmol of triethylamine for neutralization reaction, wherein the reaction time is 0.5 h; adding 50ml of deionized water, increasing the mechanical stirring speed to 1000 r/min, and emulsifying for 20 min; and finally removing acetone in the system to obtain the waterborne polyurethane emulsion.
(2) Preparation of photo-cured polyurethane film
I, drying: adding a light curing agent 2959 accounting for 4% of the solid content of the emulsion into the prepared emulsion, uniformly mixing, placing the mixture into a polytetrafluoroethylene mold, and standing the mixture at room temperature for 48 hours;
II, photocuring: and (3) placing the emulsion after standing under a 35w ultraviolet lamp for photocuring for 15min, and taking out after film forming to obtain the final ultraviolet-cured waterborne polyurethane coating.
Finally, the waterborne polyurethane coating with 4 percent of castor oil content is successfully prepared.
Example four
1. Preparation of aqueous polyurethane emulsion
I. Preparing a waterborne polyurethane prepolymer: 6.4mmol of polycarbonate diol (PCDL-1000) is subjected to dehydration pretreatment, then 25mmol of isophorone diisocyanate is added, and a catalytic amount of dibutyltin dilaurate is added to react for 2 h at 70 ℃; adding 5.8mmol of dimethylolpropionic acid (DMPA) to react at 80 ℃ for 2.5h; adding 4.69mmol of castor oil, and reacting at 70 deg.C for 1 h; and 2ml of acetone is added to reduce the viscosity of the reaction system, and the viscosity of the system is reduced to ensure that the mechanical stirring can normally operate.
II, preparing emulsion; preparing 11.5mmol of pentaerythritol triacrylate, adding the pentaerythritol triacrylate into the prepolymer for reaction, and reacting at 60 ℃ for 3 h; then cooling to 50 ℃, adding 5.8mmol of triethylamine for neutralization reaction, wherein the reaction time is 0.5 h; adding 50ml of deionized water, and increasing the mechanical stirring speed to 1000 r/min for emulsification for 20 min; and finally removing acetone in the system to obtain the waterborne polyurethane emulsion.
(2) Preparation of photo-cured polyurethane film
I, drying: adding a light curing agent 2959 accounting for 4% of the solid content of the emulsion into the prepared emulsion, uniformly mixing, placing the mixture into a polytetrafluoroethylene mold, and standing the mixture at room temperature for 48 hours;
II, photocuring: and (3) placing the emulsion after standing under a 35w ultraviolet lamp for photocuring for 15min, and taking out after film forming to obtain the final ultraviolet-cured waterborne polyurethane coating.
Finally, the waterborne polyurethane coating with the castor oil content of 8 percent is successfully prepared.
A universal tensile testing machine is utilized to carry out tensile property test on the prepared light-cured film according to GB/T1040.3-2006, and the result is shown in figure 3; cutting the film into 20 x 20 mm samples, soaking in deionized water for 24 h and 48h, removing surface moisture by using filter paper, measuring mass difference before and after the film, calculating water absorption, and evaluating the water resistance of the film, wherein the result is shown as 4; the prepared coating was subjected to a water contact angle test, and the result is shown in fig. 5; and the prepared coating is tested for surface hardness, adhesion and transparency, and the result is shown in fig. 2; the results of the polarization curve test for the 2% and 4% castor oil content coatings are shown in fig. 6.
The prepared film is subjected to performance test and bondingAs shown in figure 1, the prepared castor oil-based waterborne polyurethane anticorrosive coating has good performance, especially when the content of castor oil is 4%, the performance of the coating is most excellent, the adhesion to metal is 5B, the water absorption is 5%, the water contact angle is 90 degrees, and the corrosion current density is 1.063 x 10 -7 A/cm -2 And the protection efficiency of the Q235 steel plate substrate can reach 99.05 percent.
The above description is intended only to illustrate the preferred embodiments of the present invention, and should not be construed as limiting the invention, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A preparation method of a water-based polyurethane water-resistant coating is characterized by comprising two steps of preparing a water-based polyurethane emulsion and preparing an anticorrosive coating;
1. the preparation method of the waterborne polyurethane emulsion comprises the following specific steps:
1.1, preparation of a water-based paint prepolymer: dehydrating and pretreating oligomer polyol in a vacuum drying oven under the heating condition to obtain oligomer dihydric alcohol; adding 0.1-0.2 part of catalyst, and then reacting 30-45 parts of oligomer dihydric alcohol with 30-40 parts of diisocyanate at 70 ℃ under the condition of inert gas until the oligomer dihydric alcohol completely reacts; adding 2-6 parts of hydrophilic chain extender, reacting for 2.5 hours at 80 ℃, continuously adding 1-10 parts of cross-linking agent, reacting for 1 hour, and adding an organic solvent to reduce the viscosity of the system to obtain a waterborne polyurethane prepolymer;
1.2, preparing the aqueous polyurethane emulsion: adding 0.05 to 0.15 part of polymerization inhibitor and 5 to 25 parts of end-capping reagent into the waterborne polyurethane prepolymer, reacting for 3 hours at 60 ℃, cooling to 50 ℃, and adding 2 to 6 parts of neutralizer for reaction to obtain an end-capped prepolymer; adding deionized water into the end-capped prepolymer, stirring until the mixture is emulsified and dispersed, and distilling under reduced pressure to remove the organic solvent in the reactants to finally obtain the waterborne polyurethane emulsion;
2. the preparation method of the anticorrosive coating comprises the following specific steps:
2.1, drying: adding a photoinitiator accounting for 4wt% of the end-capped prepolymer into the aqueous polyurethane emulsion, uniformly mixing, placing the mixture into a polytetrafluoroethylene mold, and fully drying at room temperature;
2.2, photocuring and crosslinking: and (3) placing the fully dried polytetrafluoroethylene mold under an ultraviolet lamp of 200-1000W for photocuring, and taking out the mold after film forming to obtain the waterproof coating.
2. The method for preparing the water-resistant coating of waterborne polyurethane as claimed in claim 1, wherein the oligomer diol is one or more of polyester polyol, polyether polyol, polyolefin polyol, vegetable oil polyol and epoxy resin polyol with molecular weight of 500-3000.
3. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the diisocyanate is one or a combination of any more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate and hexamethylene diisocyanate.
4. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the hydrophilic chain extender is one or a combination of any more of dimethylolpropionic acid, dimethylolbutyric acid, sodium ethylene diamine ethanesulfonate, N-methyldiethanolamine and triethanolamine.
5. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the catalyst is an organotin reagent or a tertiary amine catalyst.
6. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the cross-linking agent is one or a combination of any more of trimethylolpropane and castor oil.
7. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the polymerization inhibitor is one or a combination of any more of p-methoxyphenol and hydroquinone.
8. The method of claim 1, wherein the end-capping agent is one or a combination of more of hydroxyethyl methacrylate, hydroxypropyl methacrylate, pentaerythritol diacrylate and pentaerythritol triacrylate.
9. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the neutralizing agent is one or a combination of any more of triethylamine, ammonia water and sodium hydroxide.
10. The method for preparing the water-resistant coating of the waterborne polyurethane as claimed in claim 1, wherein the photoinitiator is one or a combination of more of 2959, benzophenone and 2,4, 6-trimethylbenzoyldiphenylphosphine oxide, and the mass ratio of the photoinitiator to the blocked prepolymer in the emulsion is 1-5%.
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| CN202211235735.3A CN115433482A (en) | 2022-10-10 | 2022-10-10 | Preparation method of water-resistant coating of water-based polyurethane |
| ZA2023/02183A ZA202302183B (en) | 2022-10-10 | 2023-02-22 | A method for the preparation of water-based polyurethane water-resistant coatings |
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| CN202211235735.3A CN115433482A (en) | 2022-10-10 | 2022-10-10 | Preparation method of water-resistant coating of water-based polyurethane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116554777A (en) * | 2023-05-12 | 2023-08-08 | 河北工业大学 | Preparation method of hard self-healing aqueous polyurethane environment-friendly flash rust prevention coating |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408537A (en) * | 2011-09-19 | 2012-04-11 | 福建宝利特新材料科技有限公司 | Preparation method of acrylate modified water-borne polyurethane emulsion for synthetic leather |
| CN105418870A (en) * | 2015-11-30 | 2016-03-23 | 上海华谊涂料有限公司 | Castor oil and acrylic acid compound modified aqueous polyurethane emulsion and preparation method thereof |
| CN114686097A (en) * | 2020-12-25 | 2022-07-01 | 洛阳尖端技术研究院 | Castor oil modified photocuring wave-absorbing coating and preparation method thereof, and honeycomb sandwich wave-absorbing material and preparation method thereof |
| CN114907763A (en) * | 2022-06-28 | 2022-08-16 | 太原理工大学 | Preparation method of hyperbranched photocuring waterborne polyurethane film |
-
2022
- 2022-10-10 CN CN202211235735.3A patent/CN115433482A/en active Pending
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2023
- 2023-02-22 ZA ZA2023/02183A patent/ZA202302183B/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408537A (en) * | 2011-09-19 | 2012-04-11 | 福建宝利特新材料科技有限公司 | Preparation method of acrylate modified water-borne polyurethane emulsion for synthetic leather |
| CN105418870A (en) * | 2015-11-30 | 2016-03-23 | 上海华谊涂料有限公司 | Castor oil and acrylic acid compound modified aqueous polyurethane emulsion and preparation method thereof |
| CN114686097A (en) * | 2020-12-25 | 2022-07-01 | 洛阳尖端技术研究院 | Castor oil modified photocuring wave-absorbing coating and preparation method thereof, and honeycomb sandwich wave-absorbing material and preparation method thereof |
| CN114907763A (en) * | 2022-06-28 | 2022-08-16 | 太原理工大学 | Preparation method of hyperbranched photocuring waterborne polyurethane film |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116554777A (en) * | 2023-05-12 | 2023-08-08 | 河北工业大学 | Preparation method of hard self-healing aqueous polyurethane environment-friendly flash rust prevention coating |
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| ZA202302183B (en) | 2023-06-28 |
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