Blade protective coating

Abstract

The invention provides a blade protection coating, which belongs to the field of coating chemical industry, the blade protection coating mainly comprises a coating component and a curing agent component, the coating component comprises the following components by weight percent: 30-40% of polyaspartic acid ester resin, 50-60% of pigment filler, 0.1-0.5% of defoaming agent, 0.1-0.5% of flatting agent, 0.5-2.0% of anti-settling agent and 5-15% of solvent. And the curing agent is an isocyanate-terminated prepolymer of which the non-volatile matter is 85 to 95 weight percent. The isocyanate-terminated prepolymer is prepared by reacting linear dihydric alcohol, trimethylolpropane, diisocyanate and organic tin in a solvent. The coating has excellent weather resistance, adhesive force and flexibility, and also has outstanding wear resistance, impact resistance and rain erosion resistance.

Description

Technical Field

[0001] The invention relates to the field of coating chemicals, and in particular to a blade protective coating. Background Art

[0002] Most of the existing megawatt-class wind turbine blades are made of glass fiber reinforced epoxy composite materials. Although they have the advantages of low specific gravity, high specific strength, fatigue resistance, corrosion resistance, vibration reduction and noise reduction, they are not resistant to ultraviolet degradation and are difficult to withstand rain, snow, sand and dust abrasion; in particular, the linear velocity at the leading edge of the blade is very large, and the wind resistance is also the largest, which is more susceptible to damage from the external environment, so it is necessary to use high-performance blade coatings for protection. The method of using a composition formed by polyaspartic acid ester amine and isocyanate curing agent for blade protection has been disclosed, such as CN 115637100A, CN 105593259A, CN106519937A, CN 106147560B, CN 114085599A, and CN 116082602A, which all disclose blade coatings prepared by polyaspartic acid ester amine and isocyanate curing agent. These patents are cross-linked with commercially available isocyanate curing agents, and are still insufficient in terms of elongation at break and rain erosion resistance. Summary of the invention

[0003] In view of this, the present invention aims to provide a blade protective coating having excellent weather resistance, adhesion and flexibility, as well as outstanding wear resistance, impact resistance and rain erosion resistance.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present invention is implemented as follows: a blade protection coating, which is composed of a coating component and a curing agent component, wherein the components and dosages of the coating component are: 30wt%-40wt% of polyaspartic acid ester resin, 50wt%-60wt% of pigment and filler, 0.1wt%-0.5wt% of defoamer, 0.1wt%-0.5wt% of leveling agent, 0.5wt%-2.0wt% of anti-settling agent, and 5wt%-15wt% of solvent; the curing agent is: an isocyanate-terminated prepolymer with a non-volatile content of 85wt%-95wt%; the weight ratio of the coating component to the curing agent component is 1:1-1:2.

[0005] Furthermore, the polyaspartic acid ester resin in the coating component has a number average molecular weight of 500-600.

[0006] Furthermore, the pigments and fillers include titanium dioxide, and one or more of precipitated barium sulfate, red iron oxide, carbon black, organic yellow, and bismuth vanadate; wherein the proportion of titanium dioxide in the pigments and fillers is 70wt%-100wt%, the proportion of precipitated barium sulfate in the pigments and fillers is 0wt%-30wt%, and the proportion of red iron oxide, carbon black, organic yellow or bismuth vanadate in the pigments and fillers is 0wt%-10wt%.

[0007] Furthermore, the model of the defoaming agent is EFKA-2020; the model of the leveling agent is BYK-331.

[0008] Furthermore, the anti-settling agent is one or more of fumed silica, bentonite, polyamide wax, and polyethylene wax.

[0009] Furthermore, the isocyanate-terminated prepolymer is prepared by reflux dehydration of 50wt%-70wt% of a linear diol, 1wt%-5wt% of trimethylolpropane, and 10wt%-20wt% of a solvent, and then adding 0.05wt%-0.1wt% of an organic tin and 15wt%-30wt% of a diisocyanate for reaction at 60-80°C for 1h; the isocyanate content of the isocyanate-terminated prepolymer is 3wt%-8wt%.

[0010] Furthermore, the solvent is one or more of butyl acetate, xylene, propylene glycol methyl ether acetate, and S-1000#.

[0011] Furthermore, the molar ratio of isocyanate to hydroxyl in the reactant is 2.0:1-2.2:1.

[0012] Further, the linear diol is composed of 60wt%-100wt% of polycarbonate diol, 0wt%-25wt% of polycaprolactone diol, and 0wt%-25wt% of polyether diol;

[0013] The molecular weight of the linear diol is 1000-2000.

[0014] Furthermore, the diisocyanate is one or both of hexamethylene diisocyanate and isophorone diisocyanate.

[0015] Compared with the prior art, the blade protection coating described in the present invention has the following advantages: the present invention uses linear diol resin and diisocyanate monomer to prepare isocyanate-terminated prepolymer as a curing agent component, and is matched with polyaspartic acid ester resin to improve the elongation at break of the system and enhance the rain erosion resistance of the system. With polycarbonate diol as the main curing agent, it has extremely excellent weather resistance, and a small amount of polycaprolactone diol and polyether diol are added to adjust its flexibility. Due to the reasonable combination of various components, the present invention can provide a blade coating with excellent weather resistance, adhesion and flexibility, as well as outstanding wear resistance, impact resistance and rain erosion resistance. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0017] The invention discloses a blade protection coating, in particular to a wind turbine blade protection coating, which is composed of a coating component and a curing agent component. The components and dosages of the coating component are as follows: 30wt%-40wt% of polyaspartic acid ester resin, 50wt%-60wt% of pigment and filler, 0.1wt%-0.5wt% of defoamer, 0.1wt%-0.5wt% of leveling agent, 0.5wt%-2.0wt% of anti-settling agent, and 5wt%-15wt% of solvent; the curing agent is an isocyanate-terminated prepolymer with a non-volatile content of 85wt%-95wt%; and the weight ratio of the coating component to the curing agent component is 1:1-1:2.

[0018] The polyaspartic acid ester resin in the coating component has a number average molecular weight of 500-600.

[0019] The pigments and fillers include titanium dioxide, and one or more of precipitated barium sulfate, red iron oxide, carbon black, organic yellow, and bismuth vanadate; wherein the titanium dioxide accounts for 70wt%-100wt% of the pigments and fillers, the precipitated barium sulfate accounts for 0wt%-30wt% of the pigments and fillers, and the other pigments and fillers account for 0wt%-10wt%.

[0020] The model of the defoamer is EFKA-2020; the model of the leveling agent is BYK-331.

[0021] The anti-settling agent is one or more of fumed silica, bentonite, polyamide wax and polyethylene wax.

[0022] The isocyanate-terminated prepolymer is prepared by reflux dehydration of 50wt%-70wt% of a linear diol, 1wt%-5wt% of trimethylolpropane, and 10wt%-20wt% of a solvent, and then adding 0.05wt%-0.1wt% of an organic tin and 15wt%-30wt% of a diisocyanate to react at 60-80°C for 1h; the isocyanate content of the isocyanate-terminated prepolymer is 3wt%-8wt%.

[0023] The solvent is one or more of butyl acetate, xylene, propylene glycol methyl ether acetate, and S-1000#.

[0024] The molar ratio of isocyanate to hydroxyl in the reactant is 2.0:1-2.2:1.

[0025] The linear diol is composed of 60wt%-100wt% of polycarbonate diol, 0wt%-25wt% of polycaprolactone diol and 0wt%-25wt% of polyether diol; the molecular weight of the linear diol is 1000-2000.

[0026] The diisocyanate is one or both of hexamethylene diisocyanate and isophorone diisocyanate.

[0027] The present invention will be further described below with reference to embodiments, but is not limited thereto.

[0028] Unless otherwise specified, the raw materials used in the examples are all commercially available industrial products for coatings.

[0029] The paint making process of each embodiment is prepared according to the existing process. The composition of the curing agent component and the coating component in each embodiment is shown in Table 1.

[0030] Table 1 Composition of curing agent components and coating components in the examples

[0031]

[0032] The preparation of the curing agent component of Example 1, Example 2, Example 3, and Example 4 is as follows: linear diol, trimethylolpropane, butyl acetate, and xylene are added to a reaction bottle with a thermometer and a reflux device, the temperature is raised to reflux and then dehydrated for 0.5h, the temperature is lowered to below 40°C, organotin and diisocyanate are added, and the temperature is raised to 60-80°C for reaction for 1h.

[0033] The coating components of Example 1, Example 2, Example 3 and Example 4 are all prepared according to the existing process.

[0034] Comparative Example 1

[0035] The polyaspartic acid ester resin in Example 1 is replaced by a hydroxy acrylic resin having a hydroxy content of 4.4%, and the curing agent is Desmodur N3390BA / SN.

[0036] Comparative Example 2

[0037] The polyaspartic acid ester resin in Example 1 is replaced by a polyester resin having a hydroxyl content of 4.4%, and the curing agent is Desmodur N3390BA / SN.

[0038] Performance Testing

[0039] The coatings prepared in Examples 1-4 and Comparative Examples 1-2 were subjected to performance tests: adhesion was tested according to the method of GB / T5210; tensile strength was tested according to the method of GB / T 1040; elongation at break was tested according to the method of GB / T528; weather resistance was tested according to the method of GB / T14522; and abrasion resistance was tested according to the method of GB / T 1768. The test results are shown in Table 2.

[0040] Table 2 Performance test results of embodiments and comparative examples

[0041]

[0042] It can be seen from the test results that, compared with existing products, the wind turbine blade protective coating provided by the present invention is significantly improved in terms of wear resistance, weather resistance and elongation at break.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A blade protection coating, consisting of a coating component and a curing agent component, characterized in that: The components and dosage of the coating components are: 30wt%-40wt% of polyaspartic acid ester resin, 50wt%-60wt% of pigment and filler, 0.1wt%-0.5wt% of defoamer, 0.1wt%-0.5wt% of leveling agent, 0.5wt%-2.0wt% of anti-settling agent, 5wt%-15wt% of solvent; the curing agent is: an isocyanate-terminated prepolymer with a non-volatile content of 85wt%-95wt%; the weight ratio of the coating components to the curing agent components is 1:1-1:

2.

2. A blade protection coating according to claim 1, characterized in that: The polyaspartic acid ester resin in the coating component has a number average molecular weight of 500-600.

3. The blade protection coating according to claim 1, characterized in that: The pigments and fillers include titanium dioxide, and one or more of precipitated barium sulfate, red iron oxide, carbon black, organic yellow, and bismuth vanadate; wherein the proportion of titanium dioxide in the pigments and fillers is 70wt%-100wt%, the proportion of precipitated barium sulfate in the pigments and fillers is 0wt%-30wt%, and the proportion of red iron oxide, carbon black, organic yellow or bismuth vanadate in the pigments and fillers is 0wt%-10wt%.

4. The blade protection coating according to claim 1, characterized in that: The model of the defoamer is EFKA-2020; the model of the leveling agent is BYK-331.

5. The blade protection coating according to claim 1, characterized in that: The anti-settling agent is one or more of fumed silica, bentonite, polyamide wax and polyethylene wax.

6. The blade protection coating according to claim 1, characterized in that: The isocyanate-terminated prepolymer is prepared by reflux dehydration of 50wt%-70wt% of a linear diol, 1wt%-5wt% of trimethylolpropane, and 10wt%-20wt% of a solvent, and then adding 0.05wt%-0.1wt% of an organic tin and 15wt%-30wt% of a diisocyanate to react at 60-80°C for 1h; the isocyanate content of the isocyanate-terminated prepolymer is 3wt%-8wt%.

7. A blade protection coating according to claim 1 or 6, characterized in that: The solvent is one or more of butyl acetate, xylene, propylene glycol methyl ether acetate, and S-1000#.

8. The blade protection coating according to claim 6, characterized in that: The molar ratio of isocyanate to hydroxyl in the reactant is 2.0:1-2.2:

1.

9. The blade protection coating according to claim 6, characterized in that: The linear diol is composed of 60wt%-100wt% of polycarbonate diol, 0wt%-25wt% of polycaprolactone diol, and 0wt%-25wt% of polyether diol; The molecular weight of the linear diol is 1000-2000.

10. The blade protection coating according to claim 6, characterized in that: The diisocyanate is one or both of hexamethylene diisocyanate and isophorone diisocyanate.

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