A super-slip inorganic zinc-rich coating

Abstract

The invention discloses a super-slip inorganic zinc-rich coating, which comprises an inorganic zinc-rich coating and a super-slip coating. The inorganic zinc-rich coating is made of nano-modified inorganic zinc-rich coating, and a low surface energy lubricating oil is poured on the surface of the inorganic zinc-rich coating to form the super-slip coating. The super-slip inorganic zinc-rich coating of the invention solves the problem that the inorganic zinc-rich coating has a poor anti-corrosion effect in a high humidity and water contact environment by introducing super-slip coating technology, and further improves the anti-corrosion performance of the inorganic zinc-rich coating.

Description

Technical Field

[0001] The invention discloses an ultra-slip inorganic zinc-rich coating and belongs to the technical field of metal anti-corrosion. Background Art

[0002] Steel is a widely used engineering material, which is found in all aspects of people's production and life. Statistics show that the loss of steel due to corrosion is as high as 10% of the total output worldwide each year, and the economic loss caused by steel corrosion accounts for about 3.5% of the gross national product. Therefore, it is necessary to adopt anti-corrosion measures for steel products, among which anti-corrosion coating is the most effective, economical and common practice.

[0003] Alcohol-soluble inorganic zinc-rich coating uses ethyl orthosilicate as a film-forming substance, and forms an iron-zinc silicate complex coating on the steel surface through a cross-linking reaction with zinc powder and surface iron atoms, and protects the steel through electrochemical protection and shielding effects, and has excellent anti-corrosion performance. However, due to the high zinc powder content in the coating, the coating has a porous structure, and the coating is hydrophilic. Water and corrosive media dissolved in water can easily contact the steel substrate, resulting in it not being directly used in the field of anti-corrosion in high humidity or water contact environments.

[0004] Super-slip coating is a new bionic material. In 2011, the Aizenberg research group at Harvard University simulated the principle of Nepenthes preying on insects on its smooth surface and proposed the concept of liquid-infused porous surface for the first time. By infusing the porous structure with a low-surface-energy liquid, the air film in the porous solid is replaced by a liquid film, forming a more stable "solid / liquid composite film layer". Due to the low surface energy of the liquid, the ambient liquid has a larger contact angle and a smaller sliding angle on the surface, making it difficult to adhere to or invade the surface, so the surface is also called a "super-slip surface". The liquid film on the super-slip surface can effectively prevent the corrosive medium from invading the coating, so it has a highly effective anti-corrosion effect.

[0005] The inorganic zinc-rich coating has a porous structure. If it can be combined with the super-slip coating technology, the coating may be able to effectively prevent the intrusion of liquid corrosive media and improve the coating's anti-corrosion effect in high humidity and water contact environments. Summary of the invention

[0006] Based on the problems existing in the above-mentioned prior art, the present invention provides an ultra-slip inorganic zinc-rich coating, the purpose of which is to solve the problem of poor anti-corrosion effect of inorganic zinc-rich coatings in high humidity and water contact environments by introducing ultra-slip coating technology, and further improve the anti-corrosion performance of inorganic zinc-rich coatings.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A super-slip inorganic zinc-rich coating, characterized in that: the super-slip inorganic zinc-rich coating comprises an inorganic zinc-rich coating and a super-slip coating; the inorganic zinc-rich coating is made of nano-modified inorganic zinc-rich coating, and a low surface energy lubricating oil is poured onto the surface of the inorganic zinc-rich coating to form a super-slip coating.

[0009] Furthermore, the nano-modified inorganic zinc-rich coating is obtained by mixing component A and component B containing hydrophobic nanoparticles and stirring them uniformly.

[0010] Further, the raw materials of component A are composed of 10-30% of tetraethyl orthosilicate, 5-10% of small molecule hydrophobic agent, 0.5-2% of hydrophobic nanoparticles, 5-20% of filler, and 48-76.5% of solvent in terms of mass percentage. Component B is zinc powder. The mass ratio of component A to component B is 1:2-4.

[0011] Preferably, the low surface energy lubricating oil is perfluoropolyether.

[0012] Preferably, the small molecule hydrophobic agent in the component A is one or more of perfluorooctyltriethoxysilane, tridecafluorooctyltrimethoxysilane, heptadecafluorodecyltriethoxysilane and heptadecafluorodecyltrimethoxysilane.

[0013] Preferably, the hydrophobic nanoparticles in component A are hydrophobically modified fumed silica, and the particle size distribution is 10-500 nanometers.

[0014] Preferably, the filler in component A is one or more of zinc oxide, titanium dioxide, mica powder, talc powder and iron-titanium powder.

[0015] Preferably, the solvent in component A is one or both of anhydrous ethanol and isopropanol.

[0016] Preferably, the zinc powder in component B is 500 mesh zinc powder.

[0017] Preferably, the inorganic zinc-rich coating is prepared by mixing component A and component B of a nano-modified inorganic zinc-rich coating and then applying by brushing, roller coating or spraying.

[0018] The beneficial effects of the present invention are mainly reflected in:

[0019] The ultra-slip inorganic zinc-rich coating of the present invention solves the problem of poor anti-corrosion effect of inorganic zinc-rich coating in high humidity and water contact environment by introducing ultra-slip coating technology, and further improves the anti-corrosion performance of inorganic zinc-rich coating. The specific mechanism is: through nano-modification, low surface energy lubricating oil can be stably stored in the micropores of inorganic zinc-rich coating; the presence of low surface energy lubricating oil can effectively block the penetration of corrosive media into the coating, especially in high humidity or water contact environment, which improves the anti-corrosion ability of the coating; the presence of low surface energy lubricating oil reduces the adhesion of pollutants on the coating surface, so that the coating has self-cleaning ability. The preparation process of the ultra-slip inorganic zinc-rich coating of the present invention is simple and suitable for large-area construction. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below. The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0021] Example 1

[0022] Preparation of nano-modified inorganic zinc-rich coating component A: Add 0.5 g of hydrophobic fumed silica (particle size 100 nm), 13 g of ethyl orthosilicate, 5 g of perfluorooctyltriethoxysilane, 5 g of zinc oxide and 4 g of mica powder to 50 g of anhydrous ethanol and mechanically stir for 30 minutes to obtain nano-modified inorganic zinc-rich coating component A.

[0023] Preparation of nano-modified inorganic zinc-rich coating: Take 15g of component A, add 30g of 500-mesh zinc powder into the stirring component A, and continue stirring for 15 minutes to obtain the usable nano-modified inorganic zinc-rich coating.

[0024] Preparation of inorganic zinc-rich coating: The nano-modified inorganic zinc-rich coating prepared above was sprayed twice on a clean steel plate at a distance of 20 cm and a speed of 8 cm / s through an air gun with a pressure of 40 psi, and then the steel plate was cured at room temperature to obtain an inorganic zinc-rich coating.

[0025] Preparation of super-slip inorganic zinc-rich coating: brush perfluoropolyether on the surface of the inorganic zinc-rich coating obtained in the previous step, and leave it for 2 hours to allow the perfluoropolyether oil to fully enter the micropores of the inorganic zinc-rich coating to obtain a super-slip inorganic zinc-rich coating.

[0026] The above ultra-smooth inorganic zinc-rich coating was tested for neutral salt spray resistance according to GB / T1771-2007. After 2000 hours of testing, the coating had no blistering, cracking, peeling, rusting, etc. The contact angle and sliding angle tests were carried out according to ISO19403-2-2017 and ISO19403-7-2017, and the contact angle and sliding angle were 133° and 4° respectively.

[0027] Example 2

[0028] Preparation of nano-modified inorganic zinc-rich coating component A: 1.0 g of hydrophobic fumed silica (particle size 30 nm), 20 g of ethyl orthosilicate, 8 g of heptadecafluorodecyltriethoxysilane and 7 g of titanium dioxide were added to 60 g of isopropanol and mechanically stirred for 30 minutes to obtain nano-modified inorganic zinc-rich coating component A.

[0029] Preparation of nano-modified inorganic zinc-rich coating: Take 10g of component A, add 30g of 500-mesh zinc powder into the stirring component A, and continue stirring for 15 minutes to obtain the usable nano-modified inorganic zinc-rich coating.

[0030] Preparation of inorganic zinc-rich coating: The nano-modified inorganic zinc-rich coating prepared above was brushed twice on a clean steel plate, and then the steel plate was cured at room temperature to obtain an inorganic zinc-rich coating.

[0031] Preparation of super-slip inorganic zinc-rich coating: brush perfluoropolyether on the surface of the inorganic zinc-rich coating obtained in the previous step, and leave it for 2 hours to allow the perfluoropolyether oil to fully enter the micropores of the inorganic zinc-rich coating to obtain a super-slip inorganic zinc-rich coating.

[0032] The above inorganic zinc-rich coating and super-slip inorganic zinc-rich coating were tested for neutral salt spray resistance according to GB / T1771-2007: after 2000 hours of testing, the inorganic zinc-rich coating showed rust problems, while the super-slip inorganic zinc-rich coating had no blistering, cracking, peeling, rusting, etc. The contact angle and sliding angle tests were conducted according to ISO19403-2-2017 and ISO19403-7-2017: the contact angle and sliding angle of the super-slip inorganic zinc-rich coating were 138° and 3° respectively; the inorganic zinc-rich coating showed hydrophilicity, and water droplets directly penetrated into the coating, so the contact angle and sliding angle could not be measured.

[0033] Example 3

[0034] Preparation of nano-modified inorganic zinc-rich coating component A1: Add 1.0 g of hydrophobic fumed silica (particle size 500 nm), 25 g of ethyl orthosilicate, 6 g of heptadecafluorodecyltrimethoxysilane, 2 g of tridecafluorooctyltrimethoxysilane, 3 g of talc and 3 g of iron titanium powder to a mixed solution of 30 g of isopropanol and 30 g of anhydrous ethanol, and mechanically stir for 30 minutes to obtain nano-modified inorganic zinc-rich coating component A1.

[0035] Preparation of nano-modified inorganic zinc-rich coating component A2: 25 g of ethyl orthosilicate, 3 g of talc and 3 g of iron-titanium powder were added to a mixed solution of 30 g of isopropanol and 30 g of anhydrous ethanol, and mechanically stirred for 30 minutes to obtain nano-modified inorganic zinc-rich coating component A2.

[0036] Preparation of nano-modified inorganic zinc-rich coating: Take 10 g of component A1, add 40 g of 500 mesh zinc powder into the stirring component A1, and continue stirring for 15 minutes to obtain the usable nano-modified inorganic zinc-rich coating N1.

[0037] Preparation of inorganic zinc-rich coating: Take 10 g of component A2, add 40 g of 500 mesh zinc powder into the stirring component A2, and continue stirring for 15 minutes to obtain the usable inorganic zinc-rich coating N2.

[0038] Preparation of inorganic zinc-rich coatings: The nano-modified inorganic zinc-rich coating N1 and inorganic zinc-rich coating N2 prepared above were respectively coated twice on clean steel plates by roller coating, and then the steel plates were cured at room temperature to obtain inorganic zinc-rich coatings C1 and C2.

[0039] Preparation of super-slip inorganic zinc-rich coatings: brush perfluoropolyether on the surfaces of the inorganic zinc-rich coatings C1 and C2 obtained in the previous step, and leave for 2 hours to allow the perfluoropolyether oil to fully enter the micropores of the inorganic zinc-rich coatings to obtain super-slip inorganic zinc-rich coatings S1 and S2.

[0040] The above super-slip inorganic zinc-rich coatings S1 and S2 were subjected to neutral salt spray resistance test according to GB / T1771-2007. After 2000 hours of testing, the super-slip inorganic zinc-rich coating S1 had no blistering, cracking, peeling, rusting and other problems, while the super-slip inorganic zinc-rich coating S2 had rusting problems. The contact angle and sliding angle tests were carried out according to ISO19403-2-2017 and ISO19403-7-2017. The contact angle and sliding angle of the super-slip inorganic zinc-rich coating S1 were 126° and 6° respectively, and the contact angle and sliding angle of the super-slip inorganic zinc-rich coating S2 were 132° and 8° respectively.

[0041] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A super-slip inorganic zinc-rich coating, characterized in that: The super-slip inorganic zinc-rich coating is composed of an inorganic zinc-rich coating and a super-slip coating; the inorganic zinc-rich coating is made of nano-modified inorganic zinc-rich coating, and a low surface energy lubricating oil is poured onto the surface of the inorganic zinc-rich coating to form a super-slip coating; The nano-modified inorganic zinc-rich coating is obtained by mixing component A containing hydrophobic nanoparticles and component B and stirring them evenly; the raw materials of component A are composed of 10-30% of tetraethyl orthosilicate, 5-10% of small molecule hydrophobic agent, 0.5-2% of hydrophobic nanoparticles, 5-20% of filler, and 48-76.5% of solvent in terms of mass percentage; component B is zinc powder; the mass ratio of component A to component B is 1:2-4; The small molecule hydrophobic agent is one or more of perfluorooctyl triethoxysilane, tridecafluorooctyl trimethoxysilane, heptadecafluorodecyl triethoxysilane and heptadecafluorodecyl trimethoxysilane; The hydrophobic nanoparticles are hydrophobic fumed silica with a particle size distribution of 10-500 nanometers; The filler is one or more of zinc oxide, titanium dioxide, mica powder, talcum powder and iron titanium powder; The solvent is one or both of anhydrous ethanol and isopropanol.

2. The ultra-slip inorganic zinc-rich coating according to claim 1, characterized in that: The low surface energy lubricating oil is perfluoropolyether.

3. The ultra-slip inorganic zinc-rich coating according to claim 1, characterized in that: The zinc powder is 500 mesh zinc powder.

4. The ultra-slip inorganic zinc-rich coating according to claim 1, characterized in that: The inorganic zinc-rich coating is prepared by brushing, roller coating or spraying.