CN113025132A - Water-based organic silicon modified fluorocarbon wind power blade coating and preparation method thereof - Google Patents
Water-based organic silicon modified fluorocarbon wind power blade coating and preparation method 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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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Abstract
The invention discloses a water-based organic silicon modified fluorocarbon wind power blade coating, which relates to the technical field of water-based coatings, and consists of a component A and a component B, wherein the component B is water-dispersible isocyanate; the component A comprises: 55-60 parts of aqueous fluorocarbon resin, 5-10 parts of polyether modified polydimethylsiloxane, 0.1-0.2 part of preservative, 0.2-0.5 part of defoaming agent, 0.3-0.5 part of substrate wetting agent, 0.3-0.5 part of flatting agent, 1-3 parts of adhesion promoter, 30-35 parts of aqueous industrial color paste, 0.3-0.6 part of thickening agent, 0.1-0.3 part of pH regulator and 1-5 parts of deionized water; the equivalent ratio of-OH provided by the component A to-NCO provided by the water dispersible isocyanate component B is 1: 1.45. The invention has the advantages that: the coating has good mechanical property, high aging resistance and high humidity resistance of fluorocarbon coating, and also has excellent self-cleaning function and anti-icing function.
Description
Technical Field
The invention relates to the technical field of water-based coatings, and particularly relates to a water-based organic silicon modified fluorocarbon wind power blade coating and a preparation method thereof.
Background
Wind energy is more and more emphasized nowadays as a renewable clean energy source, and wind power has a wide prospect in China, so that corresponding wind power blade coatings also have large market demands. The national 863 program is dedicated to support the localization of blade coatings. The wind power blade coating has the advantages of excellent weather resistance, humidity resistance, freezing resistance, low VOC and the like besides conventional good mechanical properties. At present, in this emerging field, a solvent-based coating is mostly used, for example, patent with publication number CN106243981A discloses a wind power blade coating with high wind and sand erosion resistance and a preparation method thereof, wherein one or more of butyl acetate, xylene or nylon acid methyl ester is used as a solvent in the preparation process, but the solvent-based coating is prepared by using an organic solvent as a dispersion medium, and has the problems of environmental pollution, energy waste, high cost and the like.
Disclosure of Invention
The invention aims to provide a water-based organic silicon modified fluorocarbon wind power blade coating which has the performances of a solvent type wind power blade coating, can be self-cleaned and anti-icing, and has excellent weather resistance, humidity resistance, freezing resistance and excellent mechanical properties of a coating film.
The invention solves the technical problems through the following technical means:
a water-based organic silicon modified fluorocarbon coating for wind power blades is a two-component coating consisting of a component A and a component B, wherein the component A is a main paint, and the component B is water dispersible isocyanate;
the main paint is mainly prepared from the following raw materials in parts by weight: 55-60 parts of aqueous fluorocarbon resin, 5-10 parts of polyether modified polydimethylsiloxane, 0.1-0.2 part of preservative, 0.2-0.5 part of defoaming agent, 0.3-0.5 part of substrate wetting agent, 0.3-0.5 part of flatting agent, 1-3 parts of adhesion promoter, 30-35 parts of aqueous industrial color paste, 0.3-0.6 part of thickening agent, 0.1-0.3 part of pH regulator and 1-5 parts of deionized water;
the equivalent ratio of-OH provided by the main paint to-NCO provided by the water dispersible isocyanate is 1: 1.45.
Has the advantages that: the mass ratio of the aqueous fluorocarbon resin to the polyether modified polydimethylsiloxane is out of the range, and the coating film has poor mechanical property and unsatisfactory self-cleaning, anti-icing, anti-aging, humidity and heat resistance and other properties. The application and the selection of the dosage of the substrate wetting agent and the adhesion promoter play a good auxiliary role for the invention, and the application and the selection of the dosage of the preservative, the thickening agent and the pH regulator ensure that the product system of the invention is in a good storage stable state.
The water-based organic silicon modified fluorocarbon wind power blade coating disclosed by the invention is good in mechanical property, and not only has high aging resistance and high humidity resistance of the fluorocarbon coating, but also has excellent self-cleaning function and anti-icing function; the perfect combination and the water-based performance of the organic silicon and the fluorocarbon material improve the comprehensive performance of the wind power blade coating by one grade, and are green and environment-friendly.
Preferably, the water dispersible isocyanate mainly comprises the following cold-mix components in parts by weight: 40-60 parts of water-dispersible HDI isocyanate and 40-50 parts of water-dispersible IPDI isocyanate.
Has the advantages that: when two kinds of water dispersible isocyanates are used, the coating film has good water resistance, fast hardness increase and long activation period.
Preferably, the main paint is mainly prepared from the following raw materials in parts by weight: 57 parts of aqueous fluorocarbon resin, 8 parts of polyether modified polydimethylsiloxane, 0.1 part of preservative, 0.3 part of defoaming agent, 0.5 part of substrate wetting agent, 0.5 part of flatting agent, 1 part of adhesion promoter, 30 parts of aqueous industrial color paste, 0.2 part of thickening agent, 0.1 part of pH regulator and 2.3 parts of deionized water.
Preferably, the main paint is mainly prepared from the following raw materials in parts by weight: 60 parts of aqueous fluorocarbon resin, 5 parts of polyether modified polydimethylsiloxane, 0.1 part of preservative, 0.3 part of defoaming agent, 0.5 part of substrate wetting agent, 0.5 part of flatting agent, 1 part of adhesion promoter, 30 parts of aqueous industrial color paste, 0.3 part of thickening agent, 0.1 part of pH regulator and 2.3 parts of deionized water.
Preferably, the preservative comprises one or both of BIT, Methylisothiazolinone (MIT).
Has the advantages that: the preservative does not contain formaldehyde, heavy metal and halogen, has low smell, small stimulation to human bodies, broad-spectrum sterilization and corrosion prevention and long-acting protection effect on systems.
Preferably, the defoamer comprises a non-silicon defoamer.
Has the advantages that: good defoaming effect, good compatibility and difficult shrinkage and oil leakage.
Preferably, the substrate wetting agent comprises one or both of acetylenic diols, silicones.
Has the advantages that: has extremely low dynamic and static surface tension, unstable foam, good acid-base stability and low water sensitivity.
Preferably, the leveling agent includes a non-silicon-based leveling agent.
Has the advantages that: good compatibility, long wave leveling and later leveling effect.
Preferably, the adhesion promoter comprises an epoxy modified silane oligomer.
Has the advantages that: can assist in promoting the ductility of the coating film and the adhesion to the substrate.
Preferably, the aqueous industrial color paste is resin-free high-solid aqueous color paste with the fineness of less than or equal to 10 microns.
Has the advantages that: the pigment contained in the paint has high light and heat resistance, high acid and alkali resistance, high covering power and high chalking resistance.
Preferably, the thickener comprises a non-ionic polyurethane thickener.
Has the advantages that: providing a low shear, high shear thickening effect.
Preferably, the pH adjuster comprises an organic amine.
Has the advantages that: low smell and high effect.
Preferably, the preparation method of the main paint comprises the following steps:
(1) mixing the aqueous fluorocarbon resin with a preservative, a defoaming agent, a substrate wetting agent, a leveling agent and an adhesion promoter, adding polyether modified polydimethylsiloxane, fully stirring, adjusting the pH value of the system to 7.0-8.5 by using a pH agent, sampling by using a sampling scraper, stopping stirring until the sampling scraper has no shrinkage cavity, and controlling the temperature of the material system to be less than or equal to 60 ℃;
(2) continuously slowly adding the aqueous industrial color paste in batches, fully and uniformly stirring and toning;
(3) adding deionized water, adjusting the viscosity of the material system to 70-110KU by using a thickening agent, adding a pH regulator, adjusting the pH value of the material system to 7.0-8.5, and filtering to obtain a filtrate, namely the main paint.
Preferably, the stirring speed in the step (1) is 1250-1800 r/min.
Preferably, the cold splicing method of the water dispersible isocyanate comprises the following steps:
(1) filling nitrogen into a closed kettle with a stirrer;
(2) accurately metering two kinds of water dispersible isocyanates, putting the water dispersible isocyanates into a kettle, uniformly stirring the water dispersible isocyanates and packaging the water dispersible isocyanates.
The invention also provides a preparation method of the water-based organic silicon modified fluorocarbon wind power blade coating, which comprises the following steps:
(1) mixing the aqueous fluorocarbon resin with a preservative, a defoaming agent, a substrate wetting agent, a leveling agent and an adhesion promoter, adding polyether modified polydimethylsiloxane, fully stirring, adjusting the pH value of the system to 7.0-8.5 by using a pH agent, sampling by using a sampling scraper, stopping stirring until the sampling scraper has no shrinkage cavity, and controlling the temperature of the material system to be less than or equal to 60 ℃;
(2) continuously slowly adding the aqueous industrial color paste in batches, fully and uniformly stirring and toning;
(3) adding deionized water, adjusting the viscosity of the material system to 70-110KU by using a thickening agent, adding a pH regulator, adjusting the pH value of the material system to 7.0-8.5, and filtering to obtain a filtrate, namely the main paint;
(4) under the protection of nitrogen, uniformly cold-splicing and mixing water dispersible HDI isocyanate and water dispersible IPDI isocyanate to obtain a component B;
(5) and mixing the prepared main paint A component and the prepared main paint B component to obtain the water-based organic silicon modified fluorocarbon wind power blade coating.
Has the advantages that: the main paint of the invention takes water-based organic silicon modified fluorocarbon resin as a main film forming substance, polysiloxane is cold splicing modified and contains hydroxyl active reaction groups, the fluorocarbon resin provides main hydroxyl active groups, and interpenetrating networks can be formed through hydroxyl reaction to form a high molecular alloy (IPN structure). The performance of the coating film not only has the hardness, wear resistance and chemical resistance of polyurethane, but also has the light retention, color retention, pulverization resistance, yellowing resistance and thermal stability of fluorocarbon, and has extremely low surface tension of an organic silicon coating, thereby providing the functions of self-cleaning and anti-icing. The polymer structure can make up for the deficiencies in performance.
The water dispersible isocyanate mainly comprises the cold splicing of water dispersible HDI isocyanate and water dispersible IPDI isocyanate. So that the coating has good water resistance, fast hardness increase and long activation period.
The reaction equivalent ratio of the main paint and the water dispersible isocyanate component between the A component and the B component is 1:1.45, namely the reaction equivalent ratio of-OH provided by the A component to-NCO provided by the B component is 1.
The preparation method is simple, the dispersion medium in the preparation process is water, the polysiloxane is cold-spliced, the system can be helped to form a film, a film-forming auxiliary agent is not required to be added externally, only a very small amount of organic solvent is carried in the material, and the Volatile Organic Compound (VOC) is extremely low, so that the preparation method is beneficial to environmental protection and the health of constructors.
The invention has the advantages that:
the main paint of the invention takes water-based organic silicon modified fluorocarbon resin as a main film forming substance, polysiloxane is cold splicing modified and contains hydroxyl active reaction groups, the fluorocarbon resin provides main hydroxyl active groups, and interpenetrating networks can be formed through hydroxyl reaction to form a high molecular alloy (IPN structure). The performance of the coating film not only has the hardness, wear resistance and chemical resistance of polyurethane, but also has the light retention, color retention, pulverization resistance, yellowing resistance and damp-heat stability of fluorocarbon, and has the extremely low surface tension of an organic silicon coating, thereby providing the functions of self-cleaning and anti-icing. The polymer structure can make up for the deficiencies in performance.
The component B of the invention is mainly prepared by cold splicing of water dispersible HDI isocyanate and water dispersible IPDI isocyanate. So that the coating has good water resistance, fast hardness increase and long activation period.
The dispersing medium is deionized water, polysiloxane is cold-spliced, a system can be helped to form a film, a film forming auxiliary agent is not required to be added externally, only a very small amount of organic solvent is carried in the material, the VOC is extremely low, zero VOC emission can be considered, the construction diluent is pure tap water, the environment protection and the health of constructors are facilitated, the resources are saved, and the environment is protected.
The water-based organic silicon modified fluorocarbon wind power blade coating disclosed by the invention is hard and wear-resistant in coating film performance, good in chemical resistance, good in gloss retention, color retention, chalking resistance, yellowing resistance and wet-heat stability, has self-cleaning and anti-icing functions, is a water-based product, and is green and environment-friendly.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
The SN3760 flatting agent, the SN-9730pH regulator, the SN9750 preservative, the SN-7520 adhesion promoter and the SN-5780 antifoaming agent are purchased from Shanghai deep bamboo chemical science and technology Limited; 2105-3SiW substrate wetting agents were purchased from Hehaichuan chemical; gel0434, Gel0620 thickeners were purchased from OMG, usa; the aqueous industrial color paste is purchased from Shanghai Bingcai New Material science and technology company; the aqueous fluorocarbon resin is obtained by purchase; the polyether modified polydimethylsiloxane is obtained by purchasing; both water dispersible isocyanates were purchased from outsourced sources.
The aqueous fluorocarbon resin, polyether modified polydimethylsiloxane, preservative, defoamer, leveling agent, adhesion promoter, aqueous industrial color paste, thickener and pH regulator in the following examples are all the prior art.
Example 1
The water-based organic silicon modified fluorocarbon wind power blade coating main paint comprises the following raw materials in parts by weight: 57kg of aqueous fluorocarbon resin (model DF-M105A), 8kg of polyether modified polydimethylsiloxane (model WE-D9750R), 0.1kg of SN9750 preservative, 0.3kg of SN-5780 defoamer, 0.5kg of 2105-3SiW substrate wetting agent, 0.5kg of SN3760 flatting agent, 1kg of SN-7520 adhesion promoter, 30kg of aqueous industrial color paste, 0.3kg of thickener, 0.1kg of SN-9730pH regulator and 2.3kg of deionized water. The thickener in the embodiment is formed by mixing a Gel0434 thickener and a Gel0620 thickener, wherein the mass ratio of the Gel0434 thickener to the Gel0620 thickener is 1:1.
the preparation method of the main paint comprises the following steps:
(1) adding the aqueous fluorocarbon resin, the preservative, the defoaming agent, the substrate wetting agent, the flatting agent and the adhesion promoter into a mixing kettle according to the weight component ratio, mixing, adding the polyether modified polydimethylsiloxane, and adjusting the pH value to 7.5;
(2) stirring at a high speed, controlling the stirring speed to be 1250r/min, dispersing for 0.5h, then measuring once every 0.5h until the sampling scraper has no shrinkage cavity, and controlling the temperature of the outlet material to be less than or equal to 60 ℃;
(3) continuously slowly adding the aqueous industrial color paste in batches, fully and uniformly stirring and toning;
(4) adding the rest deionized water, adjusting the viscosity to 76KU by using a thickening agent, adjusting the pH value to 7.5 by using a pH adjusting agent, filtering by using a vibrating screen of 80 meshes, and packaging to obtain filtrate, namely the main paint.
The preparation method of the component B comprises the following steps: under the protection of nitrogen, 50 parts of water-dispersible HDI isocyanate and 50 parts of water-dispersible IPDI isocyanate are mixed uniformly in a cold splicing manner.
The water-based organic silicon modified fluorocarbon wind power blade coating comprises a main paint A component and a B component water dispersible isocyanate in the embodiment, wherein the reaction equivalent ratio of the main paint A component to the B component water dispersible isocyanate, namely the reaction equivalent ratio of-OH provided by the A component to-NCO provided by the B component is 1:1.45, calculating parts by weight according to the equivalent ratio, subpackaging the main paint component and the water dispersible isocyanate component according to the weight components to obtain the water-based organic silicon modified fluorocarbon wind power blade coating, mixing the main paint A component and the B component water dispersible isocyanate according to the weight parts when the water-based organic silicon modified fluorocarbon wind power blade coating is used, and then diluting the water-based organic silicon modified fluorocarbon wind power blade coating with purified water with the main paint amount of 10%.
Example 2
The water-based organic silicon modified fluorocarbon wind power blade coating main paint comprises the following raw materials in parts by weight: 60kg of aqueous fluorocarbon resin, 5kg of polyether modified polydimethylsiloxane, 0.1kg of SN9750 preservative, 0.3kg of SN-5780 defoaming agent, 0.5kg of 2105-3SiW substrate wetting agent, 0.5kg of SN3760 flatting agent, 1kg of SN-7520 adhesion promoter, 30kg of aqueous industrial color paste, 0.2kg of thickening agent, 0.1kg of SN-9730pH regulator and 2.3kg of deionized water. The thickener in the embodiment is formed by mixing a Gel0434 thickener and a Gel0620 thickener, wherein the mass ratio of the Gel0434 thickener to the Gel0620 thickener is 1:1.
the preparation method of the main paint comprises the following steps:
(1) adding the aqueous fluorocarbon resin, the preservative, the defoaming agent, the substrate wetting agent, the flatting agent and the adhesion promoter into a mixing kettle according to the weight component ratio, mixing, adding the polyether modified polydimethylsiloxane, and adjusting the pH value to 8.0;
(2) stirring at a high speed, controlling the stirring speed to be 1250r/min, dispersing for 0.5h, then measuring once every 0.5h until the sampling scraper has no shrinkage cavity, and controlling the temperature of the outlet material to be less than or equal to 60 ℃;
(3) continuously slowly adding the aqueous industrial color paste in batches, fully and uniformly stirring and toning;
(4) adding the rest deionized water, adjusting the viscosity to 76KU by using a thickening agent, adjusting the pH value to 8.0 by using a pH adjusting agent, filtering by using a vibrating screen of 80 meshes, and packaging to obtain filtrate, namely the main paint.
The water-based organic silicon modified fluorocarbon wind power blade coating comprises a main paint A component in the embodiment and a B component water dispersible isocyanate in the embodiment 1, wherein the reaction equivalent ratio of the main paint A component to the B component water dispersible isocyanate is that-OH provided by the A component and-NCO provided by the B component have the reaction equivalent ratio of 1:1.45, calculating parts by weight according to an equivalent ratio, subpackaging the main paint A component and the B component water dispersible isocyanate according to the weight components to obtain the water-based organic silicon modified fluorocarbon wind power blade coating, mixing the A component and the B component according to the weight ratio when in use, and then diluting with purified water with the main paint amount of 12.5%.
Example 3
The water-based organic silicon modified fluorocarbon wind power blade coating main paint comprises the following raw materials in parts by weight: 58.5kg of aqueous fluorocarbon resin, 6.5kg of polyether modified polydimethylsiloxane, 0.1kg of SN9750 preservative, 0.3kg of SN-5780 defoaming agent, 0.5kg of 2105-3SiW substrate wetting agent, 0.5kg of SN3760 flatting agent, 1kg of SN-7520 adhesion promoter, 30kg of aqueous industrial color paste, 0.2kg of thickening agent, 0.1kg of SN-9730pH regulator and 2.3kg of deionized water. The thickener in the embodiment is formed by mixing a Gel0434 thickener and a Gel0620 thickener, wherein the mass ratio of the Gel0434 thickener to the Gel0620 thickener is 1/1.
The preparation method of the main paint comprises the following steps:
(1) adding the aqueous fluorocarbon resin, the preservative, the defoaming agent, the substrate wetting agent, the flatting agent and the adhesion promoter into a mixing kettle according to the weight component ratio, mixing, adding the polyether modified polydimethylsiloxane, and adjusting the pH value to 8.5;
(2) stirring at a high speed, controlling the stirring speed to be 1250r/min, dispersing for 0.5h, then measuring once every 0.5h until the sampling scraper has no shrinkage cavity, and controlling the temperature of the outlet material to be less than or equal to 60 ℃;
(3) continuously slowly adding the aqueous industrial color paste in batches, fully and uniformly stirring and toning;
(4) adding the rest deionized water, adjusting the viscosity to 76KU by using a thickening agent, adjusting the pH value to 8.5 by using a pH adjusting agent, filtering by using a vibrating screen of 80 meshes, and packaging to obtain filtrate, namely the main paint.
The water-based organic silicon modified fluorocarbon wind power blade coating comprises a main paint A component in the embodiment and a B component water dispersible isocyanate in the embodiment 1, wherein the reaction equivalent ratio of the main paint A component to the B component water dispersible isocyanate is that-OH provided by the A component and-NCO provided by the B component have the reaction equivalent ratio of 1:1.45, calculating parts by weight according to an equivalent ratio, subpackaging the component A and the component B of the main paint in water dispersible isocyanate according to the weight components to obtain the water-based organic silicon modified fluorocarbon wind power blade coating, mixing the component A and the component B according to the weight ratio when the water-based organic silicon modified fluorocarbon wind power blade coating is used, and then diluting the mixture with purified water with 15% of the main paint amount.
Example 4
The performance comparison detection is carried out on the water-based organic silicon modified fluorocarbon wind power blade coating prepared in the example 1 and the existing water-based wind power blade coating (self-cleaning fluorocarbon finish coating purchased from the coating chemical company Limited of China and overseas provinces) according to the indexes listed in the following table, and the detection results are shown in the table 1:
table 1 shows the comparative test results of the performances of the coating of the invention and the existing coating
As can be seen from Table 1, the water-based organic silicon modified fluorocarbon wind power blade coating prepared in the embodiment 1 of the invention has the advantages of hard and wear-resistant coating film, good chemical resistance, good gloss retention, color retention, chalking resistance, no yellowing, good damp-heat stability, self-cleaning function and anti-icing function. The waterborne product is green and environment-friendly.
Comparative example 1
This comparative example differs from example 1 in that: the equivalent ratio of the water dispersible isocyanate of the component A and the component B of the main paint is 1: 1.35.
comparative example 2
This comparative example differs from example 2 in that: the equivalent ratio of the water dispersible isocyanate of the component A and the component B of the main paint is 1: 1.55.
the performance of the water-based organic silicon modified fluorocarbon wind power blade coating prepared in the example 1 and the comparative example 2 is measured, the measuring method of each index is the prior art, and the measuring result is shown in table 2.
Table 2 shows the performance measurement results of the waterborne organosilicon modified fluorocarbon wind power blade coatings prepared in example 1 and comparative example 2
| -OH/-NCO | Self-cleaning property | Anti-icing property | Wear resistance | Water resistance |
| 1∶1.35 | Level 1 | Water-spraying frozen ice non-stick coupling | No nail scratch | Slight foaming |
| 1∶1.45 | Level 0 | Water-spraying frozen ice non-stick coupling | No nail scratch | Does not bubble |
| 1∶1.55 | 1-2 stages | Water-spraying frozen ice non-stick coupling | Slight scratch of nail | Slight foaming |
Wherein the adhesion: most preferably, level 0; water resistance: soaking in tertiary water for 240 hr.
As can be seen from Table 2, when the water dispersible isocyanate-reactive equivalent ratio of the A component and the B component of the main paint, i.e., the equivalent ratio of-OH provided by the A component to-NCO provided by the B component, is 1:1.45, the prepared water-based organic silicon modified fluorocarbon wind power blade coating has good self-cleaning property, anti-icing property, wear resistance and water resistance.
Comparative example 3
The comparative example is different from example 1 in that the cold blending ratio of the water dispersible HDI isocyanate and the water dispersible IPDI isocyanate in the component B is respectively as follows: 60:40,40:60.
Table 3 shows the performance measurement results of the aqueous organosilicon modified fluorocarbon coating for wind turbine blades prepared in comparative example 3
| HDI/IPDI | Period of activation | Self-drying 12 hours hardness | Impact/after month | Water resistance |
| 60/40 | 3 hours | The fingers are marked with marks | 50 | Slight foaming |
| 50/50 | 4 hours | Finger-scratch-free | 50 | Does not bubble |
| 40/60 | 4.5 hours | Finger-scratch-free | 40 | Does not bubble |
Wherein the activation period refers to normal temperature; water resistance: soaking in tertiary water for 240 hr.
As can be seen from Table 3, the overall performance is best when the cold-mix ratio of the water-dispersible HDI isocyanate and the water-dispersible IPDI isocyanate as the B component of the main paint is 50/50.
The dispersion medium in the preparation process of the paint is deionized water, polysiloxane is cold-spliced, the paint can also help a system to form a film, a film-forming auxiliary agent is not required to be added externally, only a very small amount of organic solvent is carried in the material, the VOC is extremely low, the VOC emission is zero, and a construction diluent, namely pure tap water is beneficial to environmental protection and the health of constructors, so that resources are saved, and the environment is protected.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The water-based organic silicon modified fluorocarbon coating for the wind power blade is characterized in that: the coating is a two-component coating consisting of a component A and a component B, wherein the component A is a main paint, and the component B is water dispersible isocyanate;
the component A is mainly prepared from the following raw materials in parts by weight: 55-60 parts of aqueous fluorocarbon resin, 5-10 parts of polyether modified polydimethylsiloxane, 0.1-0.2 part of preservative, 0.2-0.5 part of defoaming agent, 0.3-0.5 part of substrate wetting agent, 0.3-0.5 part of flatting agent, 1-3 parts of adhesion promoter, 30-35 parts of aqueous industrial color paste, 0.3-0.6 part of thickening agent, 0.1-0.3 part of pH regulator and 1-5 parts of deionized water;
the equivalent ratio of-OH provided by the component A to-NCO provided by the water dispersible isocyanate component B is 1: 1.45.
2. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the component B mainly comprises the following components in parts by weight: 40-60 parts of water-dispersible HDI isocyanate and 40-50 parts of water-dispersible IPDI isocyanate.
3. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the preservative comprises one or two of BIT and MIT.
4. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the defoamer comprises a non-silicon defoamer.
5. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the substrate wetting agent comprises one or two of acetylene glycol and organic silicon.
6. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the leveling agent comprises a non-silicon leveling agent.
7. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the aqueous industrial color paste is resin-free high-solid aqueous color paste with the fineness of less than or equal to 10 microns.
8. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the thickener comprises a non-ionic polyurethane thickener.
9. The water-based organic silicon modified fluorocarbon wind power blade coating as claimed in claim 1, wherein: the pH adjuster includes an organic amine.
10. A method of preparing a coating according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
(1) mixing the aqueous fluorocarbon resin with a preservative, a defoaming agent, a substrate wetting agent, a leveling agent and an adhesion promoter, adding polyether modified polydimethylsiloxane, fully stirring, adjusting the pH value of the system to 7.0-8.5 by using a pH agent, sampling by using a sampling scraper, stopping stirring until the sampling scraper has no shrinkage cavity, and controlling the temperature of the material system to be less than or equal to 60 ℃;
(2) continuously slowly adding the aqueous industrial color paste in batches, fully and uniformly stirring and toning;
(3) adding deionized water, adjusting the viscosity of the material system to 70-110KU by using a thickening agent, adding a pH regulator, adjusting the pH value of the material system to 7.0-8.5, and filtering to obtain a filtrate, namely the main paint;
(4) under the protection of nitrogen, uniformly cold-splicing and mixing water dispersible HDI isocyanate and water dispersible IPDI isocyanate to obtain a component B;
(5) and mixing the prepared main paint A component and the prepared main paint B component to obtain the water-based organic silicon modified fluorocarbon wind power blade coating.
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| CN115960495A (en) * | 2022-12-28 | 2023-04-14 | 广东省科学院化工研究所 | Hydrophilic self-cleaning fluorocarbon coating and preparation method and application thereof |
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