A coating for hot-dip galvanized offshore photovoltaic support and its preparation process

Abstract

The invention discloses a coating for hot-dip galvanizing offshore photovoltaic brackets and a preparation process thereof, and relates to the field of coatings. The coating for hot-dip galvanizing offshore photovoltaic brackets of the invention comprises the following raw materials in parts by weight: 10-20 parts of graphene powder, 5-10 parts of modified graphene oxide, 55-60 parts of carboxyl saturated polyester resin, 4-5 parts of triglycidyl isocyanurate, 0.8-1.2 parts of leveling agent, 0.3-0.4 parts of defoaming agent, 0.6-0.8 parts of brightener, 30-38 parts of pigment filler, 0.8-1.2 parts of fumed silica, 0.4-0.6 parts of antioxidant, and 0.4-0.6 parts of ultraviolet absorber. The present invention uses graphene powder, modified graphene oxide, carboxyl saturated polyester resin and triglycidyl isocyanurate as raw materials, adds leveling agent, defoaming agent, brightener, pigment filler, fumed silica, antioxidant and ultraviolet absorber, and adopts a certain ratio. The prepared coating is used for hot-dip galvanized offshore photovoltaic brackets, and forms a composite system with long-term anti-corrosion protection with the galvanized substrate, which protects the galvanized layer from oxidation and has the characteristics of super weather resistance.

Description

Technical Field

[0001] The invention relates to the field of coatings, and in particular to a coating for hot-dip galvanizing offshore photovoltaic brackets and a preparation process thereof. Background Art

[0002] In the field of modern renewable energy, photovoltaic power generation has been widely used as a clean and efficient way of energy conversion. With the growing demand for renewable energy, offshore photovoltaic power generation systems have gradually become a hot spot in research and practice. Compared with traditional onshore photovoltaic systems, offshore photovoltaic systems have the advantages of less pollution, low land occupation and high power generation efficiency. However, the marine environment has put forward higher requirements on the corrosion resistance and service life of photovoltaic brackets and their materials, especially metal brackets.

[0003] Hot-dip galvanizing is an effective anti-corrosion measure and is widely used in the protection of steel structures. It can significantly improve the durability of metal materials in harsh environments. However, although the hot-dip galvanizing layer can provide excellent anti-corrosion performance, it still faces some challenges, such as zinc layer peeling, insufficient wear resistance, and sensitivity to ultraviolet rays in specific environments. In addition, due to the influence of salt spray, humidity, temperature difference and other factors in the marine environment, traditional marine structural coatings are often not ideal, which can easily lead to coating aging and failure, thereby affecting the safety and service life of the overall structure.

[0004] Therefore, in order to meet the requirements of offshore photovoltaic brackets in terms of corrosion resistance, UV resistance, wear resistance, etc., it is particularly important to develop a coating with excellent performance and the corresponding preparation process. The coating should not only have good adhesion and weather resistance, but also adapt to the complex environmental conditions of the ocean to ensure that it still maintains excellent protection effects during long-term use, thereby extending the service life of the photovoltaic bracket and improving the economic benefits and reliability of the overall system. Summary of the invention

[0005] In view of the above-mentioned prior art, the present invention provides a coating for hot-dip galvanized offshore photovoltaic brackets and a preparation process thereof to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is implemented as follows: A coating for hot-dip galvanized offshore photovoltaic brackets, comprising the following raw materials in parts by weight: 10-20 parts of graphene powder, 5-10 parts of modified graphene oxide, 55-60 parts of carboxyl saturated polyester resin, 4-5 parts of triglycidyl isocyanurate, 0.8-1.2 parts of leveling agent, 0.3-0.4 parts of defoaming agent, 0.6-0.8 parts of brightener, 30-38 parts of color filler, 0.8-1.2 parts of fumed silica, 0.4-0.6 parts of antioxidant, and 0.4-0.6 parts of ultraviolet absorber.

[0007] Furthermore, the coating for hot-dip galvanized offshore photovoltaic bracket is made of the following raw materials in parts by weight: 15 parts of graphene powder, 8 parts of modified graphene oxide, 58 parts of carboxyl saturated polyester resin, 4.1 parts of triglycidyl isocyanurate, 1 part of leveling agent, 0.35 parts of defoaming agent, 0.7 parts of brightener, 35 parts of color filler, 1 part of fumed silica, 0.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber.

[0008] Furthermore, the graphene powder consists of 20-30nm graphene powder and 100-200nm graphene powder in a mass ratio of 1:4-8.

[0009] Furthermore, the preparation method of the modified graphene oxide comprises the following steps: adding graphene oxide GO to 80-120 times the weight of deionized water, ultrasonically dispersing to obtain a graphene oxide suspension, adding arginine to the graphene oxide suspension under stirring, wherein the mass ratio of graphene oxide to arginine is 1:23-28, reacting for 24-48 hours at a temperature of 55-60° C. under nitrogen protection, and washing, filtering and drying the reaction product to obtain modified graphene oxide.

[0010] Furthermore, the carboxyl saturated polyester has a molecular weight of 6000-7000 g / mol, an acid value of 30-36 mgKOH / g, and a glass transition temperature of ≥65°C.

[0011] Furthermore, the antioxidant is composed of antioxidant AO-80 and 2,6-di-tert-butyl-4-methylphenol in a mass ratio of 10:3-5.

[0012] Furthermore, the ultraviolet absorber is composed of ultraviolet absorber UV400, ultraviolet absorber UV-531 and ultraviolet absorber UV-9 in a mass ratio of 10:4-6:0.8-1.2.

[0013] Furthermore, the pigment and filler are zinc titanium dioxide and zinc powder in a mass ratio of 5-7:2-4.

[0014] Furthermore, the defoaming agent is diphenyl ethyl ketone; the leveling agent is PV88 leveling agent; and the brightening agent is 701 brightening agent.

[0015] Furthermore, the fumed silica is nano fumed silica.

[0016] The present invention also provides a preparation process of a coating for hot-dip galvanizing offshore photovoltaic brackets, comprising the following steps:

[0017] S1. Weigh all raw materials, place them in a vertical mixer, mix them for 100-150 seconds, and crush them for 100-150 seconds to obtain a mixture;

[0018] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 110-120°C and a rotation speed of 600-1000 rpm to obtain an extrudate;

[0019] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention provides a coating with a new formula that can meet the requirements of hot-dip galvanized offshore photovoltaic brackets in terms of corrosion resistance, UV resistance, wear resistance, etc., has good adhesion and weather resistance, and is better adapted to complex marine environmental conditions, ensuring that it maintains excellent protective effects during long-term use and avoids zinc layer peeling, which helps to extend the service life of hot-dip galvanized offshore photovoltaic brackets and improve the economic benefits and reliability of the overall system.

[0022] (ii) The present invention uses graphene powder, modified graphene oxide, carboxyl saturated polyester resin and triglycidyl isocyanurate as raw materials, adds leveling agent, defoaming agent, brightener, pigment filler, fumed silica, antioxidant and ultraviolet absorber, and adopts a certain ratio to prepare a coating for hot-dip galvanizing offshore photovoltaic brackets, forming a composite system with the galvanized substrate for long-term anti-corrosion protection, protecting the galvanized layer from oxidation, exerting a long-term cathodic protection effect, and having the characteristics of super weather resistance.

[0023] (III) The present invention uses modified graphene oxide and graphene powder to compound, so as to enhance the bending resistance, wear resistance, moisture and heat resistance, UV resistance and other properties of the coating, and further extend its service life.

[0024] (iv) The hot-dip galvanized offshore photovoltaic bracket coating system using the coating of the present invention does not powder, fade, or crack when exposed to strong ultraviolet rays, has excellent anti-corrosion performance, does not require cathodic protection with external current or external anode blocks, and has an anti-corrosion period of more than 25 years, which can better protect the hot-dip galvanized offshore photovoltaic bracket in the marine atmosphere zone. DETAILED DESCRIPTION

[0025] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0026] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0027] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial sources.

[0028] The brand of triglycidyl isocyanurate used in the embodiment of the present invention is Huangshan Jinfeng, and the product abbreviation is TGIC;

[0029] The fumed nano-silica used in the embodiment of the present invention is Cabot fumed silica M-5.

[0030] Preparation Example 1

[0031] Preparation of modified graphene oxide: 1 kg of graphene oxide GO was added to 100 kg of deionized water, and ultrasonically dispersed at 800 W for 30 min to obtain a graphene oxide suspension. 25 kg of arginine was added to the graphene oxide suspension under stirring, and the reaction was carried out at 58°C ± 2°C for 24 h under nitrogen protection. The reaction product was washed, filtered, and dried to obtain modified graphene oxide.

[0032] Example 1

[0033] 1. Coating formula table

[0034] Table 1 Coating formula of Example 1

[0035]

[0036] 2. Preparation process

[0037] The preparation process of the coating for hot-dip galvanizing offshore photovoltaic bracket comprises the following steps:

[0038] S1. Weigh each raw material, place it in a vertical mixer, mix for 120 seconds, and crush for 120 seconds to obtain a mixture;

[0039] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 115°C ± 5°C and a rotation speed of 800 rpm to obtain an extruded material;

[0040] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0041] Example 2

[0042] 1. Coating formula table

[0043] Table 2 Coating formula of Example 2

[0044]

[0045] 2. Preparation process

[0046] The preparation process of the coating for hot-dip galvanizing offshore photovoltaic bracket comprises the following steps:

[0047] S1. Weigh each raw material, place it in a vertical mixer, mix for 120 seconds, and crush for 120 seconds to obtain a mixture;

[0048] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 115°C ± 5°C and a rotation speed of 800 rpm to obtain an extruded material;

[0049] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0050] Example 3

[0051] 1. Coating formula table

[0052] Table 3 Coating formula of Example 3

[0053]

[0054] 2. Preparation process

[0055] The preparation process of the coating for hot-dip galvanizing offshore photovoltaic bracket comprises the following steps:

[0056] S1. Weigh each raw material, place it in a vertical mixer, mix for 120 seconds, and crush for 120 seconds to obtain a mixture;

[0057] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 115°C ± 5°C and a rotation speed of 800 rpm to obtain an extruded material;

[0058] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0059] Comparative Example 1

[0060] 1. Coating formula table

[0061] Table 4 Coating formula of comparative example 1

[0062]

[0063] 2. Preparation process

[0064] The preparation process of the coating for hot-dip galvanizing offshore photovoltaic bracket comprises the following steps:

[0065] S1. Weigh each raw material, place it in a vertical mixer, mix for 120 seconds, and crush for 120 seconds to obtain a mixture;

[0066] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 115°C ± 5°C and a rotation speed of 800 rpm to obtain an extruded material;

[0067] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0068] Comparative Example 2

[0069] 1. Coating formula table

[0070] Table 5 Coating formula of comparative example 2

[0071]

[0072] 2. Preparation process

[0073] The preparation process of the coating for hot-dip galvanizing offshore photovoltaic bracket comprises the following steps:

[0074] S1. Weigh all raw materials, place them in a vertical mixer, mix for 120 seconds, and crush for 120 seconds to obtain a mixture;

[0075] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 115°C ± 5°C and a rotation speed of 800 rpm to obtain an extruded material;

[0076] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0077] Comparative Example 3

[0078] 1. Coating formula table

[0079] Table 6 Comparative Example 3 Coating Formula

[0080]

[0081] 2. Preparation process

[0082] The preparation process of the coating for hot-dip galvanizing offshore photovoltaic bracket comprises the following steps:

[0083] S1. Weigh all raw materials, place them in a vertical mixer, mix for 120 seconds, and crush for 120 seconds to obtain a mixture;

[0084] S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 115°C ± 5°C and a rotation speed of 800 rpm to obtain an extruded material;

[0085] S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

[0086] Comparative Example 4

[0087] The difference from Example 3 is that all graphene powders are 100-200 nm graphene powders.

[0088] Comparative Example 5

[0089] The difference from Example 3 is that all the antioxidants are antioxidant AO-80.

[0090] Comparative Example 6

[0091] The difference from Example 3 is that all the ultraviolet absorbers are ultraviolet absorbers UV400.

[0092] Test example

[0093] Electrostatic spraying (40-70KV) is used, the coating thickness is 50-70μm, and the substrate is oil-free and rust-free cold-rolled steel plate (thickness is 0.5mm). After spraying, bake at 200℃ for 10 minutes.

[0094] The coatings prepared in Examples 1-3 and Comparative Examples 1-6 were tested. The test basis is shown in Table 7, and the test results are shown in Tables 8-11.

[0095] Table 7 Detection basis

[0096]

[0097] Table 8 Test results 1

[0098]

[0099] Table 9 Test results 2

[0100]

[0101] Table 10 Test results 3

[0102]

[0103] Table 11 Test results 4

[0104]

[0105] The results show that the coatings prepared in Examples 1-3 of the present invention have good performance, excellent anti-aging ability, cathode stripping resistance and wear resistance, good bending resistance, good solvent wiping resistance, good adhesion and impact resistance, excellent UV resistance, and excellent resistance to moisture and heat, neutral salt spray, acid salt spray, seawater, acid and alkali, and can be well applied to hot-dip galvanized offshore photovoltaic brackets. Among them, the coating of Example 3 has the best performance.

[0106] Among them, compared with Example 3, Comparative Examples 1-2 added a single graphene material, among which Comparative Example 1 did not add graphene powder, and Comparative Example 2 did not add modified graphene oxide, and the coating performance of both was significantly reduced; Comparative Example 3 adjusted the proportion of coating components, and its coating performance was significantly reduced compared with Example 3; Comparative Example 4 added graphene powder of a single size, Comparative Example 5 added a single antioxidant, and Comparative Example 6 added a single ultraviolet absorber, and their coating performances were all reduced.

[0107] Application Examples

[0108] The coating prepared in Example 3 of the present invention is used for hot-dip galvanized offshore photovoltaic brackets, and the coating film thickness is 50-70μm, which effectively protects the coating system of the hot-dip galvanized offshore photovoltaic brackets from powdering, fading, and cracking under strong ultraviolet radiation, has excellent anti-corrosion performance, does not require cathodic protection of external current or external anode blocks, has a long anti-corrosion life, and can better protect the hot-dip galvanized offshore photovoltaic brackets in the marine atmosphere zone.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A coating for hot-dip galvanized offshore photovoltaic bracket, characterized in that: The invention comprises the following raw materials in parts by weight: 15 parts of graphene powder, 8 parts of modified graphene oxide, 58 parts of carboxyl saturated polyester resin, 4.1 parts of triglycidyl isocyanurate, 1 part of leveling agent, 0.35 parts of defoaming agent, 0.7 parts of brightener, 35 parts of pigment and filler, 1 part of fumed silica, 0.5 parts of antioxidant and 0.5 parts of ultraviolet absorber; The preparation method of the modified graphene oxide comprises the following steps: adding graphene oxide to 80-120 times the weight of deionized water, ultrasonically dispersing to obtain a graphene oxide suspension, adding arginine to the graphene oxide suspension under stirring, wherein the mass ratio of the graphene oxide to the arginine is 1:23-28, reacting for 24-48 hours at a temperature of 55-60° C. under nitrogen protection, and washing, filtering and drying the reaction product to obtain the modified graphene oxide; The graphene powder is composed of 20-30nm graphene powder and 100-200nm graphene powder in a mass ratio of 1:4-8; the antioxidant is composed of antioxidant AO-80 and 2,6-di-tert-butyl-4-methylphenol in a mass ratio of 10:3-5; the ultraviolet absorber is composed of ultraviolet absorber UV400, ultraviolet absorber UV-531 and ultraviolet absorber UV-9 in a mass ratio of 10:4-6:0.8-1.

2.

2. The coating for hot-dip galvanized offshore photovoltaic support according to claim 1, characterized in that: The carboxyl saturated polyester has a molecular weight of 6000-7000 g / mol, an acid value of 30-36 mgKOH / g, and a glass transition temperature of ≥65°C.

3. The coating for hot-dip galvanized offshore photovoltaic support according to claim 1, characterized in that: The pigment and filler are zinc titanium dioxide and zinc powder in a mass ratio of 5-7:2-4.

4. The coating for hot-dip galvanizing offshore photovoltaic support according to claim 1, characterized in that: The defoaming agent is benzoic acid ketone; the leveling agent is PV88 leveling agent; the brightening agent is 701 brightening agent; and the fumed silica is nano fumed silica.

5. The preparation process of the coating for hot-dip galvanizing offshore photovoltaic support according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Weigh all raw materials, place them in a vertical mixer, mix them for 100-150 seconds, and crush them for 100-150 seconds to obtain a mixture; S2, the mixed material is processed by a twin-screw extruder with a jacket temperature of 110-120°C and a rotation speed of 600-1000 rpm to obtain an extrudate; S3. Grind the extrudate to less than 100 μm to obtain a powder coating.

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