CN110684440A - Anticorrosive tough coating for outdoor communication tower and preparation method thereof - Google Patents
Anticorrosive tough coating for outdoor communication tower and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anticorrosive tough coating for an outdoor communication tower and a preparation method thereof, wherein the anticorrosive tough coating is prepared from the following raw materials in parts by weight: 12-18 parts of polychlorotrifluoroethylene resin, 35-45 parts of bisphenol A epoxy resin, 8-12 parts of polyphenyl methyl siloxane, 2-6 parts of alpha, omega-dihydroxy polydimethylsiloxane, 2-6 parts of amino modified polysiloxane, 2-6 parts of hexamethyldisilazane, 2-6 parts of gas phase nano silicon dioxide, 7-11 parts of silicon carbide short fiber, 12-16 parts of mica iron oxide powder, 2-8 parts of dimethylbenzene, 10-20 parts of acetone aqueous solution and 1-3 parts of polyamine mixed curing agent. The anticorrosive tough coating obtained by the invention has excellent anticorrosive performance, weather resistance and good elasticity, and when the anticorrosive tough coating is coated on a communication tower, the coating is compact, has excellent anticorrosive, anti-aging, hydrophobic, stain-resistant and impact-resistant effects, can better adapt to severe environment, and effectively prolongs the service life of the communication tower.
Description
Technical Field
The invention relates to the technical field of coating compositions, in particular to an anticorrosive tough coating for an outdoor communication tower and a preparation method thereof.
Background
The installation addresses of most communication towers in China are mainly selected outdoors, and are easily corroded when being subjected to wind, sun, rain and rain. The strong acid-base environment, the high salt fog environment, the high temperature difference environment and the high humidity environment provide a severe test for the use effect and the service life of the traditional anticorrosive paint, and particularly, under the conditions of high latitude and coastal areas, large day-night temperature difference and large four-season temperature difference, the steel structure continuously generates expansion deformation and recovery deformation under the action of repeated temperature gradient, so that the anticorrosive paint on the metal surface is forced to deform. The traditional anticorrosive paint is cracked under the repeated action, and the corrosion of the protected metal is also caused. The failure modes of the coating are many in variety, but the failure modes of cracking and spalling can result in the complete loss of protection of the coating to the substrate. Ordinary alkyd, acrylic acid, epoxy anticorrosive paint and the like have small linear expansion coefficient, and inevitably cause the generation of coating cracks under the deformation action of long-term expansion with heat and contraction with cold of a substrate, and the coating cracks to cause the failure of the anticorrosion effect. In the face of the problem of corrosion resistance failure caused by such severe cracking, the most common means in the market at present is to add a certain content of toughening agent into the conventional coating to improve the toughness of the coating so as to prevent the occurrence of coating cracking, and the method inhibits the phenomenon of coating cracking to a certain extent, but cannot tolerate the impact of higher temperature gradient.
When the anticorrosive paint is applied, the environment is severe, so that natural wind, sunshine and rain exist, and the influence of corrosive gas dissolved in water on the coating can be further received. The good hydrophobicity can effectively prevent moisture from entering the protected metal material, and is also favorable for taking away the dirt on the surface of the coating by water drops in the rainy period, thereby playing the self-cleaning role. Therefore, the anticorrosive paint exposed to natural conditions not only requires excellent corrosion resistance, hydrophobicity and aging resistance, but also has excellent toughness, and the existing paint has defects of hydrophobicity and toughness.
Disclosure of Invention
The invention aims to provide an anticorrosive tough coating for an outdoor communication tower and a preparation method thereof, the obtained anticorrosive tough coating has excellent anticorrosive performance, weather resistance and good elasticity, and when the coating is coated on the communication tower, the coating is compact, has excellent anticorrosive, anti-aging, hydrophobic, stain-resistant and impact-resistant effects, can better adapt to severe environments, and effectively prolongs the service life of the communication tower.
The technical scheme adopted by the invention is as follows:
an anticorrosive tough coating for an outdoor communication tower is prepared from the following raw materials in parts by weight:
12-18 parts of polychlorotrifluoroethylene resin, 35-45 parts of bisphenol A epoxy resin, 8-12 parts of polyphenyl methyl siloxane, 2-6 parts of alpha, omega-dihydroxy polydimethylsiloxane, 2-6 parts of amino modified polysiloxane, 2-6 parts of hexamethyldisilazane, 2-6 parts of gas phase nano silicon dioxide, 7-11 parts of silicon carbide short fiber, 12-16 parts of mica iron oxide powder, 2-8 parts of dimethylbenzene, 10-20 parts of acetone aqueous solution and 1-3 parts of polyamine mixed curing agent.
The polychlorotrifluoroethylene resin is high-temperature-resistant and high-transparency polychlorotrifluoroethylene resin, and is prepared by preparing polychlorotrifluoroethylene resin in deionized water under the action of an azo initiator and then carrying out end-capping treatment on polychlorotrifluoroethylene by using cobalt fluoride.
The bisphenol A type epoxy resin is formed by mixing E-44 epoxy resin and E-51 epoxy resin in a weight ratio of 1-2: 1.
The polyphenyl methyl siloxane is hydroxyl-terminated polyphenyl methyl siloxane.
The alpha, omega-dihydroxy polydimethylsiloxane is prepared by mixing alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 2000 mPa.s-4000 mPa.s and alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 30000 mPa.s-40000 mPa.s.
The mass concentration of the acetone aqueous solution is 60wt% -70 wt%.
The preparation method of the anticorrosive tough coating comprises the following steps:
(1) vacuum drying the silicon carbide short fibers at 100 ℃ for 24 hours, and uniformly mixing hexamethyldisilazane, gas-phase nano silicon dioxide and mica iron oxide powder to obtain a component A;
(2) taking polychlorotrifluoroethylene resin, bisphenol A epoxy resin, polyphenyl methylsiloxane, alpha, omega-dihydroxy polydimethylsiloxane and amino modified polysiloxane, adding xylene solvent and acetone aqueous solution, and uniformly stirring to obtain a component B;
(3) and finally, mixing the component A, B, adding the polyamine mixed curing agent, and stirring uniformly to obtain the high-performance polyurethane adhesive.
The invention has the beneficial effects that:
polychlorotrifluoroethylene resin is a transparent resin having low permeability, excellent cold flow resistance, abrasion resistance and irradiation resistance, and has high mechanical strength and rigidity. The polychlorotrifluoroethylene resin used in the invention is subjected to end capping treatment on polychlorotrifluoroethylene by using cobalt fluoride, and the tail end of the polychlorotrifluoroethylene resin is a fluorine end group, so that chain degradation cannot be caused in the processing process. The introduction of fluorine-containing groups into the coating can reduce the surface energy of the coating and improve the hydrophobic property and oil resistance of the coating.
The epoxy resin has the following characteristics: (1) good dispersion performance, and can be mutually dissolved with various fillers, resins and auxiliaries; (2) has better chemical resistance, especially alkali resistance; (3) excellent adhesion to various substrates; (4) has good toughness, hardness, flexibility and excellent water resistance. The invention adopts 2 bisphenol A epoxy resins with different epoxy values as film forming materials, and the types are respectively E-44 and E-51; the E-44 epoxy value is lower, the hardness is poorer after film forming and curing, but the impact resistance and the flexibility are better; the E-51 epoxy value is higher, the hardness is higher after film forming and curing, but the impact resistance and the flexibility are poorer; 2 the epoxy resin has excellent intersolubility, can be mixed for use, has complementary performance, and can ensure that a coating film has good physical and mechanical properties.
Polyphenylmethylsiloxane, α, ω -dihydroxypolydimethylsiloxane, and amino-modified polysiloxane are all silicones having excellent weather resistance. The organosilicon has the advantages of low-temperature flexibility, low surface energy, heat resistance, weather resistance, hydrophobicity and the like, and the organosilicon modified epoxy resin integrates the advantages of the organosilicon modified epoxy resin and the organosilicon modified epoxy resin, and can obviously improve the physical and chemical properties of toughness, heat resistance and the like of the matrix epoxy resin. The coating of the fluorosilicone coating formed by the organic silicon modified fluororesin has the characteristics of good oil repellency, water repellency, dirt repellency, chemical medium resistance, weather resistance and the like. Silicon methoxy active group (Si-OCH) of polyphenylmethylsiloxane3) The epoxy resin and secondary hydroxyl of the epoxy resin are subjected to polycondensation reaction to form the organic silicon modified epoxy resin with proper crosslinking density, and the polyphenyl methyl siloxane reduces the internal stress of matrix resin, improves the system compatibility and also improves the heat resistance of the modified resin. The polydimethylsiloxane has excellent flexibility and unique low surface energy, can reduce the modulus of the epoxy resin, improve the flexibility of the epoxy resin and obviously improve the surface performance of the epoxy resin. The alpha, omega-dihydroxy polydimethylsiloxane introduces hydroxyl on polydimethylsiloxane, can improve the defects that the polydimethylsiloxane is not miscible with resin and is difficult to disperse, and has good compatibility with the resin. The amino modified polysiloxane can effectively toughen the resin and improve the impact strength of the coating.
The nano silicon dioxide has optical characteristics of ultraviolet absorption, infrared reflection and the like, the nano silicon dioxide can form a network structure when a coating is dried, and the effect on improving the ageing resistance, the smoothness, the strength and the corrosion resistance of the coating is obvious, the silicon carbide fiber is mainly used as a high-temperature resistant material and a reinforcing material, the silicon carbide fiber is used for a coating and can effectively reduce the sedimentation phenomenon of a filler in the curing process of the coating, toughen the coating, prevent the coating from cracking and peeling caused by external force and impact, and prolong the service life of the coating, the silicon carbide fiber also has high-temperature resistance and can improve the high-temperature resistance of the coating, hexamethyldisilazane is used as a surface hydrophobic treatment agent of gas-phase nano silicon dioxide, improves the dispersibility of the gas-phase nano silicon dioxide in the coating, is used as an auxiliary agent of the silicon carbide fiber, improves the heat resistance and the strength of silicon carbide short fiber, and can also be used as a precipitation preventing agent of the coating, the mica iron oxide has good chemical stability, strong sunlight reflection force, can slow down the ageing of a paint film, is a good antirust nontoxic antirust pigment, and the coating made of the iron oxide has the characteristics of ① has good adhesion and excellent connection characteristics, 3632, excellent ultraviolet radiation resistance, excellent durability.
The invention takes polychlorotrifluoroethylene resin, bisphenol A type epoxy resin and weather-resistant organic silicon as film forming components, the crosslinking effect among the film forming components is good, and chemical crosslinking can be generated to form a firm net structure. The invention also adds the gas phase nano silicon dioxide, the silicon carbide short fiber and the mica iron oxide powder to enhance the density of the coating and simultaneously improve the weather resistance, heat resistance, impact resistance and corrosion resistance of the coating. The anticorrosive tough coating obtained by the invention has excellent anticorrosive performance, weather resistance and good elasticity, the salt spray resistance time is more than 2600 hours, the acid and alkali resistance time is more than 3800 hours, and the service life of the coating is long.
Detailed Description
In order to describe the present invention in more detail, the present invention will be further described with reference to the following examples.
Example 1
An anticorrosive tough coating for an outdoor communication tower is prepared from the following raw materials in parts by weight:
12 parts of polychlorotrifluoroethylene resin, 35 parts of bisphenol A epoxy resin, 8 parts of polyphenylmethylsiloxane, 2 parts of alpha, omega-dihydroxy polydimethylsiloxane, 2 parts of amino-modified polysiloxane, 2 parts of hexamethyldisilazane, 2 parts of fumed nano-silica, 7 parts of silicon carbide short fiber, 12 parts of mica iron oxide powder, 2 parts of xylene, 10 parts of acetone aqueous solution and 1 part of polyamine mixed curing agent.
The polychlorotrifluoroethylene resin is high-temperature-resistant and high-transparency polychlorotrifluoroethylene resin, and is prepared by preparing polychlorotrifluoroethylene resin in deionized water under the action of an azo initiator and then carrying out end-capping treatment on polychlorotrifluoroethylene by using cobalt fluoride.
The bisphenol A epoxy resin is formed by mixing E-44 epoxy resin and E-51 epoxy resin in a weight ratio of 1: 1.
The polyphenyl methyl siloxane is hydroxyl-terminated polyphenyl methyl siloxane.
The alpha, omega-dihydroxy polydimethylsiloxane is prepared by mixing alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 2000 mPa.s-4000 mPa.s and alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 30000 mPa.s-40000 mPa.s.
The mass concentration of the acetone aqueous solution is 60 wt%.
The preparation method of the anticorrosive tough coating comprises the following steps:
(1) vacuum drying the silicon carbide short fibers at 100 ℃ for 24 hours, and uniformly mixing hexamethyldisilazane, gas-phase nano silicon dioxide and mica iron oxide powder to obtain a component A;
(2) taking polychlorotrifluoroethylene resin, bisphenol A epoxy resin, polyphenyl methylsiloxane, alpha, omega-dihydroxy polydimethylsiloxane and amino modified polysiloxane, adding xylene solvent and acetone aqueous solution, and uniformly stirring to obtain a component B;
(3) and finally, mixing the component A, B, adding the polyamine mixed curing agent, and stirring uniformly to obtain the high-performance polyurethane adhesive.
Example 2
An anticorrosive tough coating for an outdoor communication tower is prepared from the following raw materials in parts by weight:
15 parts of polychlorotrifluoroethylene resin, 40 parts of bisphenol A epoxy resin, 10 parts of polyphenyl methylsiloxane, 4 parts of alpha, omega-dihydroxy polydimethylsiloxane, 4 parts of amino modified polysiloxane, 4 parts of hexamethyldisilazane, 4 parts of gas-phase nano silicon dioxide, 9 parts of silicon carbide short fiber, 14 parts of mica iron oxide powder, 5 parts of dimethylbenzene, 15 parts of acetone aqueous solution and 2 parts of polyamine mixed curing agent.
The polychlorotrifluoroethylene resin is high-temperature-resistant and high-transparency polychlorotrifluoroethylene resin, and is prepared by preparing polychlorotrifluoroethylene resin in deionized water under the action of an azo initiator and then carrying out end-capping treatment on polychlorotrifluoroethylene by using cobalt fluoride.
The bisphenol A epoxy resin is formed by mixing E-44 epoxy resin and E-51 epoxy resin in a weight ratio of 1: 1.
The polyphenyl methyl siloxane is hydroxyl-terminated polyphenyl methyl siloxane.
The alpha, omega-dihydroxy polydimethylsiloxane is prepared by mixing alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 2000 mPa.s-4000 mPa.s and alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 30000 mPa.s-40000 mPa.s.
The mass concentration of the acetone aqueous solution is 65 wt%.
The preparation method of the anticorrosive tough coating comprises the following steps:
(1) vacuum drying the silicon carbide short fibers at 100 ℃ for 24 hours, and uniformly mixing hexamethyldisilazane, gas-phase nano silicon dioxide and mica iron oxide powder to obtain a component A;
(2) taking polychlorotrifluoroethylene resin, bisphenol A epoxy resin, polyphenyl methylsiloxane, alpha, omega-dihydroxy polydimethylsiloxane and amino modified polysiloxane, adding xylene solvent and acetone aqueous solution, and uniformly stirring to obtain a component B;
(3) and finally, mixing the component A, B, adding the polyamine mixed curing agent, and stirring uniformly to obtain the high-performance polyurethane adhesive.
Example 3
An anticorrosive tough coating for an outdoor communication tower is prepared from the following raw materials in parts by weight:
18 parts of polychlorotrifluoroethylene resin, 45 parts of bisphenol A epoxy resin, 12 parts of polyphenyl methylsiloxane, 6 parts of alpha, omega-dihydroxy polydimethylsiloxane, 6 parts of amino modified polysiloxane, 6 parts of hexamethyldisilazane, 6 parts of gas-phase nano-silica, 11 parts of silicon carbide short fiber, 16 parts of mica iron oxide powder, 8 parts of dimethylbenzene, 20 parts of acetone aqueous solution and 3 parts of polyamine mixed curing agent.
The polychlorotrifluoroethylene resin is high-temperature-resistant and high-transparency polychlorotrifluoroethylene resin, and is prepared by preparing polychlorotrifluoroethylene resin in deionized water under the action of an azo initiator and then carrying out end-capping treatment on polychlorotrifluoroethylene by using cobalt fluoride.
The bisphenol A epoxy resin is formed by mixing E-44 epoxy resin and E-51 epoxy resin in a weight ratio of 2: 1.
The polyphenyl methyl siloxane is hydroxyl-terminated polyphenyl methyl siloxane.
The alpha, omega-dihydroxy polydimethylsiloxane is prepared by mixing alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 2000 mPa.s-4000 mPa.s and alpha, omega-dihydroxy polydimethylsiloxane with the viscosity of 30000 mPa.s-40000 mPa.s.
The mass concentration of the acetone aqueous solution is 70 wt%.
The preparation method of the anticorrosive tough coating comprises the following steps:
(1) vacuum drying the silicon carbide short fibers at 100 ℃ for 24 hours, and uniformly mixing hexamethyldisilazane, gas-phase nano silicon dioxide and mica iron oxide powder to obtain a component A;
(2) taking polychlorotrifluoroethylene resin, bisphenol A epoxy resin, polyphenyl methylsiloxane, alpha, omega-dihydroxy polydimethylsiloxane and amino modified polysiloxane, adding xylene solvent and acetone aqueous solution, and uniformly stirring to obtain a component B;
(3) and finally, mixing the component A, B, adding the polyamine mixed curing agent, and stirring uniformly to obtain the high-performance polyurethane adhesive.
The anticorrosive tough coating prepared in the embodiments 1 to 3 of the invention is subjected to performance detection, and the detection results are as follows:
Claims (7)
1. the anticorrosive tough coating for the outdoor communication tower is characterized by being prepared from the following raw materials in parts by weight:
12-18 parts of polychlorotrifluoroethylene resin, 35-45 parts of bisphenol A epoxy resin, 8-12 parts of polyphenyl methyl siloxane, 2-6 parts of alpha, omega-dihydroxy polydimethylsiloxane, 2-6 parts of amino modified polysiloxane, 2-6 parts of hexamethyldisilazane, 2-6 parts of gas phase nano silicon dioxide, 7-11 parts of silicon carbide short fiber, 12-16 parts of mica iron oxide powder, 2-8 parts of dimethylbenzene, 10-20 parts of acetone aqueous solution and 1-3 parts of polyamine mixed curing agent.
2. The anticorrosive tough coating for outdoor communication towers according to claim 1, wherein the polychlorotrifluoroethylene resin is a high-temperature-resistant and high-transparency polychlorotrifluoroethylene resin, and is prepared by preparing polychlorotrifluoroethylene resin in deionized water under the action of an azo initiator by chlorotrifluoroethylene, and then performing end capping treatment on the polychlorotrifluoroethylene by using cobalt fluoride.
3. The anticorrosive tough coating for the outdoor communication tower according to claim 1, wherein the bisphenol A epoxy resin is formed by mixing E-44 epoxy resin and E-51 epoxy resin in a weight ratio of 1-2: 1.
4. The anticorrosive tough coating for outdoor communication towers according to claim 1, wherein the polyphenyl methyl siloxane is hydroxyl-terminated polyphenyl methyl siloxane.
5. The anticorrosive tough coating for the outdoor communication tower according to claim 1, wherein the α, ω -dihydroxy polydimethylsiloxane is prepared by blending α, ω -dihydroxy polydimethylsiloxane with viscosity of 2000mpa.s to 4000mpa.s and α, ω -dihydroxy polydimethylsiloxane with viscosity of 30000mpa.s to 40000 mpa.s.
6. The anticorrosive tough coating for the outdoor communication tower of claim 1, wherein the mass concentration of the acetone aqueous solution is 60-70 wt%.
7. The anticorrosive tough coating for the outdoor communication tower of claim 1, which is prepared by the following steps:
(1) vacuum drying the silicon carbide short fibers at 100 ℃ for 24 hours, and uniformly mixing hexamethyldisilazane, gas-phase nano silicon dioxide and mica iron oxide powder to obtain a component A;
(2) taking polychlorotrifluoroethylene resin, bisphenol A epoxy resin, polyphenyl methylsiloxane, alpha, omega-dihydroxy polydimethylsiloxane and amino modified polysiloxane, adding xylene solvent and acetone aqueous solution, and uniformly stirring to obtain a component B;
(3) and finally, mixing the component A, B, adding the polyamine mixed curing agent, and stirring uniformly to obtain the high-performance polyurethane adhesive.
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| CN112795307A (en) * | 2020-12-30 | 2021-05-14 | 广东省科学院化工研究所 | Weather-resistant self-cleaning self-layering coating and preparation method and application thereof |
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| CN115109491A (en) * | 2022-07-13 | 2022-09-27 | 湖南中科智网电力科技有限公司 | Anticorrosive paint for electric power iron tower and preparation method thereof |
| CN115895433A (en) * | 2021-09-22 | 2023-04-04 | 中国石油化工股份有限公司 | Coating for high-sulfur-content oil and gas field purification device pipeline and preparation method thereof |
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