Anti-rust coating for steel structure surface and preparation process thereof

Abstract

The invention belongs to the field of metal corrosion prevention and specifically discloses an anti-rust coating for a steel structure surface and a preparation process thereof. The anti-rust coating comprises the following raw materials in parts by weight: 30-50 parts of vinyl glycol ether, 10-20 parts of sorbitan monooleate, 5-15 parts of sodium octyl sulfate, 5-10 parts of nano zirconium oxide, 5-10 parts of basalt fiber powder, 3-6 parts of nano titanium dioxide, 15-20 parts of a thickener, and 3-8 parts of a lubricant. The preparation method of the anti-rust coating material of the invention is simple, and after spraying, the coating is tightly bonded to the surface of the steel structure without the need for subsequent baking treatment. The construction is convenient and the construction cost is low. The coating surface is smooth, has good hydrophobicity, good wear resistance and aging resistance, and has an excellent anti-rust effect.

Description

Technical Field

[0001] The invention belongs to the field of metal corrosion prevention, and specifically discloses an anti-rust coating for the surface of a steel structure and a preparation process thereof. Background Art

[0002] Steel structures are made of steel and are one of the main types of building structures. They primarily consist of components such as beams, columns, and trusses, made from sections and plates. Rust removal and prevention processes include silanization, pure manganese phosphating, water washing and drying, and galvanizing. Components are typically connected using welds, bolts, or rivets. Due to its light weight and simple construction, steel structures are widely used in large factories, stadiums, high-rise buildings, bridges, and other fields. Steel structures are susceptible to rust and generally require rust removal, galvanizing, or coating, as well as regular maintenance.

[0003] The primary matrix component of steel in steel structures is iron, a highly reactive element that easily oxidizes in humid air, forming iron oxides. Iron's corrosion resistance in saline environments is also very poor, primarily due to pitting corrosion from chloride ions. In practice, the combined effects of iron oxidation and salt corrosion often result in very poor corrosion resistance. This necessitates surface treatment of the steel in steel structures, applying a protective coating with corrosion-resistant properties to extend the steel's service life and maintain its required functionality.

[0004] Currently, the most widely used rust prevention method is electroplating, such as zinc plating, nickel plating, and zinc-aluminum coating. In order to make these coatings more effective in preventing rust, they are often sealed. This is because due to defects in the preparation process, reagent composition, and reagent system, the coatings formed are often not dense. This allows factors that are destructive to iron to directly reach the substrate through the gaps in the coating, causing corrosion to the iron. Once a certain point is breached, a chain reaction quickly occurs, causing the coating to quickly lose its rust prevention ability. The purpose of the sealing treatment is to provide comprehensive protection to the substrate by filling the pores in the coating.

[0005] CN201610022301.3 discloses a rust-proof coating for steel-based materials and a preparation method thereof, wherein the rust-proof coating material includes an inorganic titanium source, H2O2, citric acid, an inorganic calcium source, and an organosilicon glycol copolymer wax. The preparation method of the rust-proof coating is to immerse the steel in a liquid of the rust-proof coating material after pre-electroplating the steel, drain, and dry the steel to obtain the rust-proof coating. The raw materials used in the above method are relatively environmentally friendly, and the preparation process is also relatively green and environmentally friendly. However, when the above materials are used, high-temperature drying is required, the construction steps are relatively cumbersome, and the cost is high, and the hydrophobicity of the above coating is relatively poor, and water is easily accumulated on the surface of the steel structure. After actual measurement, the coating prepared in the above method has a corrosion-resistant time of no more than 135 hours in a neutral salt spray test, which is insufficient for the rust-proof ability of steel structure products that have been exposed to the outdoors. Summary of the Invention

[0006] In order to solve the above problems, the present invention discloses an anti-rust coating for the surface of steel structure and its preparation process, which is convenient to construct, low in construction cost, smooth in coating surface, good in hydrophobicity, good in wear resistance and anti-aging performance, and good in anti-rust effect.

[0007] The technical solutions of the present invention are as follows:

[0008] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0009]

[0010] In a preferred embodiment, the above composition may be:

[0011]

[0012] Furthermore, in the above-mentioned anti-rust coating material for the surface of a steel structure, the average particle size of the nano-zirconia is 30-100 nm.

[0013] Furthermore, in the above-mentioned anti-rust coating material for the surface of a steel structure, the basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0014] Furthermore, in the above-mentioned anti-rust coating material for the surface of a steel structure, the nano titanium dioxide is rutile nano-grade titanium dioxide.

[0015] Furthermore, in the above-mentioned anti-rust coating material for the surface of a steel structure, the thickener is composed of lithium dodecyl stearate and dilithium adipate; in some embodiments, the mass ratio of lithium dodecyl stearate to dilithium adipate is preferably 2:1.

[0016] Furthermore, in the above-mentioned anti-rust coating material for the surface of a steel structure, the lubricant is composed of di(dibutyldithiocarbamate)molybdenum oxide and bismuth sulfide; in some embodiments, the mass ratio of di(dibutyldithiocarbamate)molybdenum oxide:bismuth sulfide can preferably be 5:1.

[0017] The present invention also discloses a method for preparing the above-mentioned rust-proof coating material for the surface of a steel structure, comprising the following steps:

[0018] 1) placing the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, followed by reacting at 2-4 MPa, 50-80° C., under protective gas, for 20-40 minutes to obtain raw material A;

[0019] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0020] Furthermore, the present invention discloses an anti-rust coating for the surface of a steel structure, which is prepared using the above-mentioned anti-rust coating material.

[0021] Furthermore, the present invention also discloses a preparation process of the anti-rust coating on the surface of the above-mentioned steel structure, which includes the following steps: heating the anti-rust coating material to 80-90°C, using a spraying device to evenly spray it on the surface of the electroplated steel structure, and preparing the anti-rust coating after natural drying in the air.

[0022] Furthermore, in the above preparation process, the thickness of the anti-rust coating is 5-30 μm, preferably 20 μm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The combined use of sorbitan monooleate and sodium octyl sulfate in the technical solution of the present invention can greatly improve the anti-rust performance. Specifically, it can be seen from the data of Example 2 and Comparative Examples 1-3 that the combined use of sorbitan monooleate and sodium octyl sulfate can improve the results of neutral salt spray tests and the like by more than 20% compared with the use of the above raw materials alone or without using the above raw materials; from the results of Example 2 and Examples 4-5, the use of a specific thickener combination and a lubricant combination can also improve the anti-rust performance by more than 10%; further, the present invention found that the combined use of basalt fiber powder and nano-zirconium oxide can increase the hydrophobicity of the final coating by more than 30%, while the simultaneous use of sorbitan monooleate and sodium octyl sulfate can improve the adhesion (more than 40%) and aging resistance of the coating; further, compared with the prior art, the present invention is convenient to construct, has low construction cost, a smooth coating surface, good hydrophobicity and aging resistance, and an excellent anti-rust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Comparative results of neutral salt spray test (h) of the rust-proof coatings prepared in Examples 1-5 and Comparative Examples 1-4;

[0026] Figure 2 Comparison of the iron ion concentration (μg / mL) of the rust-proof coatings prepared in Examples 1-5 and Comparative Examples 1-4 in acidic immersion;

[0027] Figure 3 Comparison of iron ion concentration (μg / mL) of the salt solution immersion of the rust-proof coatings prepared in Examples 1-5 and Comparative Examples 1-4;

[0028] Figure 4 Comparison results of water contact angles (degrees) of the rust-proof coatings prepared in Examples 1-5 and Comparative Examples 1-4;

[0029] Figure 5 Comparative results of adhesion (Mpa) of the anti-rust coatings prepared in Examples 1-5 and Comparative Examples 1-4. DETAILED DESCRIPTION

[0030] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0031]

[0032] The average particle size of the nano zirconium oxide is 30-100 nm.

[0033] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0034] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0035] The thickener consists of lithium lauryl stearate and dilithium adipate (CAS NO: 18621-94-8).

[0036] The lubricant consists of bis(dibutyldithiocarbamate)molybdenum oxide (CAS NO.: 68412-26-0) and bismuth sulfide.

[0037] The method for preparing the above material is characterized by comprising the following steps:

[0038] 1) placing the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, followed by reacting at 2-4 MPa, 50-80° C., under protective gas, for 20-40 minutes to obtain raw material A;

[0039] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0040] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0041] The reagents or instruments used in the examples of the present invention without indicating the manufacturer are all conventional reagent products that can be obtained through commercial purchase.

[0042] Basalt fiber was purchased from Shandong Tonghui Glass Fiber Co., Ltd., with a specification of 6 mm;

[0043] Nano-zirconia was purchased from Hubei Xinghengye Technology Co., Ltd.;

[0044] Nano-titanium dioxide was purchased from Shijiazhuang Shengpeng Chemical Co., Ltd., and the specification was rutile anatase titanium dioxide.

[0045] Example 1

[0046] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0047]

[0048] The average particle size of the nano zirconium oxide is 50 nm;

[0049] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve;

[0050] The nano titanium dioxide is rutile nano titanium dioxide;

[0051] The thickening agent is lithium dodecyl stearate;

[0052] The lubricant is bis(dibutyldithiocarbamate)molybdenum oxide (CAS 68412-26-0);

[0053] The method for preparing the above material is characterized by comprising the following steps:

[0054] 1) adding the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, and then reacting under a protective nitrogen gas at 3 MPa and 65° C. for 30 minutes to obtain raw material A;

[0055] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0056] Example 2

[0057] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0058]

[0059] The average particle size of the nano zirconium oxide is 50 nm.

[0060] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0061] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0062] The thickening agent is lithium dodecyl stearate;

[0063] The lubricant is bis(dibutyldithiocarbamate)molybdenum oxide (CAS 68412-26-0);

[0064] The preparation method of the above material comprises the following steps:

[0065] 1) adding the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, and then reacting under a protective nitrogen gas at 3 MPa and 65° C. for 30 minutes to obtain raw material A;

[0066] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0067] Example 3

[0068] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0069]

[0070] The average particle size of the nano zirconium oxide is 30-100 nm.

[0071] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0072] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0073] The thickening agent is lithium dodecyl stearate;

[0074] The lubricant is bis(dibutyldithiocarbamate)molybdenum oxide (CAS 68412-26-0);

[0075] The preparation method of the above material comprises the following steps:

[0076] 1) adding the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, and then reacting under a protective nitrogen gas at 3 MPa and 65° C. for 30 minutes to obtain raw material A;

[0077] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0078] Example 4

[0079] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0080]

[0081]

[0082] The average particle size of the nano zirconium oxide is 50 nm.

[0083] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0084] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0085] The thickening agent is lithium dodecyl stearate: dilithium adipate in a mass ratio of 2:1;

[0086] The lubricant is bis(dibutyldithiocarbamate)molybdenum oxide (CAS 68412-26-0);

[0087] The preparation method of the above material comprises the following steps:

[0088] 1) adding the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, and then reacting under a protective nitrogen gas at 3 MPa and 65° C. for 30 minutes to obtain raw material A;

[0089] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0090] Example 5

[0091] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0092]

[0093] The average particle size of the nano zirconium oxide is 50 nm.

[0094] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0095] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0096] The thickening agent is lithium dodecyl stearate: dilithium adipate in a mass ratio of 2:1;

[0097] The lubricant is bis(dibutyldithiocarbamate) molybdenum oxide: bismuth sulfide in a mass ratio of 5:1;

[0098] The preparation method of the above material comprises the following steps:

[0099] 1) adding the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, and then reacting under a protective nitrogen gas at 3 MPa and 65° C. for 30 minutes to obtain raw material A;

[0100] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0101] Comparative Example 1

[0102] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0103]

[0104] The average particle size of the nano zirconium oxide is 50 nm.

[0105] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0106] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0107] The thickening agent is lithium dodecyl stearate;

[0108] The lubricant is bis(dibutyldithiocarbamate)molybdenum oxide (CAS 68412-26-0);

[0109] The preparation method of the above material comprises the following steps:

[0110] 1) placing the formulated amounts of sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, followed by reacting at 3 MPa, 65° C., and 30 min under a protective nitrogen atmosphere to obtain raw material A;

[0111] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0112] Compared with Example 2, sorbitan monooleate is not contained, and the rest are the same.

[0113] Comparative Example 2

[0114] An anti-rust coating material for the surface of a steel structure, comprising the following raw materials in parts by weight:

[0115]

[0116]

[0117] The average particle size of the nano zirconium oxide is 50 nm.

[0118] The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

[0119] The nano titanium dioxide is rutile nano-grade titanium dioxide.

[0120] The thickening agent is lithium dodecyl stearate;

[0121] The lubricant is bis(dibutyldithiocarbamate)molybdenum oxide (CAS 68412-26-0);

[0122] The preparation method of the above material comprises the following steps:

[0123] 1) adding the formulated amount of sorbitan monooleate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, and then reacting at 3 MPa, 65° C., and 30 min under a protective nitrogen gas to obtain raw material A;

[0124] 2) At room temperature, the thickener and lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material.

[0125] Compared with Example 2, sodium octyl sulfate is not contained, and the rest are the same.

[0126] Comparative Example 3

[0127] Compared with Example 2, sorbitan monooleate and sodium octyl sulfate are not contained.

[0128] Comparative Example 4

[0129] Compared with Example 2, the basalt fiber powder and nano-zirconium oxide are not contained.

[0130] Test Case

[0131] The coatings of Examples 1-5 and Comparative Examples 1-4 were sprayed on the surface of the steel structure using the following method: the anti-rust coating material was heated to 85°C, sprayed evenly on the surface of the electroplated steel structure using a spraying device, and dried naturally in the air to obtain the anti-rust coating, with a coating thickness of 10 μm.

[0132] The steel used for the steel structure is Q235 steel, and the electroplating is electrogalvanizing.

[0133] The following tests were performed on the above-mentioned anti-rust coating.

[0134] (1) Anti-rust test

[0135] Neutral salt spray test, acid and salt solution immersion test were carried out to examine its anti-rust effect. The results are shown in Table 1 and Figure 1-3 shown.

[0136] Table 1 Antirust test

[0137]

[0138] It can be seen from the test data in Table 1 that the combined use of sorbitan monooleate and sodium octyl sulfate can significantly improve the anti-rust performance. Specifically, from the data of Example 2 and Comparative Examples 1-3, it can be seen that the combined use of sorbitan monooleate and sodium octyl sulfate can improve the results of neutral salt spray test and the like by more than 20% compared with the use of the above raw materials alone or without them. From the results of Example 2 and Examples 4-5, it can be seen that the use of a specific thickener combination and lubricant combination can also improve the anti-rust performance by more than 10%.

[0139] (2) Adhesion, anti-aging and hydrophobicity tests

[0140] Adhesion refers to GBT5210-2006, and anti-aging performance refers to GBT14522-2008. The results are shown in Table 2 and Figure 4-5 shown.

[0141] Table 2 Adhesion, anti-aging and hydrophobicity tests

[0142]

[0143]

[0144] From the test data in Table 2, it can be seen that the combined use of basalt fiber powder and nano-zirconia can increase the hydrophobicity of the final coating by more than 30%, while the simultaneous use of sorbitan monooleate and sodium octyl sulfate can improve the adhesion (more than 40%) and aging resistance of the coating.

[0145] It can be seen from the above embodiments and test examples that the preparation method of the anti-rust coating material of the present invention is simple, and it is tightly bonded to the surface of the steel structure after spraying, and does not require subsequent baking treatment. The construction is convenient and the construction cost is low. The coating surface is smooth, has good hydrophobic properties, good wear resistance and anti-aging properties, and has an excellent anti-rust effect.

[0146] The description of the limited preferred embodiments of the invention is relatively specific and detailed, but this should not be construed as limiting the scope of the invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the invention, and such modifications and improvements are within the scope of protection of the invention.

Claims

1. An anti-rust coating material for the surface of a steel structure, characterized in that: The composition is made up of the following raw materials by weight: The thickener is composed of lithium dodecyl stearate and dilithium adipate in a mass ratio of 2:1; The lubricant is composed of bis(dibutyldithiocarbamate) molybdenum oxide and bismuth sulfide in a mass ratio of 5:

1.

2. The rust-proof coating material for the surface of a steel structure according to claim 1, characterized in that: The average particle size of the nano zirconium oxide is 30-100 nm.

3. The rust-proof coating material for steel structure surface according to claim 1, characterized in that: The basalt fiber powder is obtained by grinding basalt fiber until it passes through a 200-mesh sieve.

4. The rust-proof coating material for the surface of a steel structure according to claim 1, characterized in that: The nano titanium dioxide is rutile nano-grade titanium dioxide.

5. The method for preparing the rust-proof coating material according to any one of claims 1 to 4, characterized in that: The following steps are involved: 1) placing the formulated amounts of sorbitan monooleate, sodium octyl sulfate, nano zirconium oxide, basalt fiber powder, and nano titanium dioxide powder into a reaction kettle containing vinyl glycol ether and stirring evenly, followed by reacting at 2-4 MPa, 50-80° C., under protective gas, for 20-40 minutes to obtain raw material A; 2) At room temperature, a thickener and a lubricant are added to the raw material A and stirred evenly to obtain the anti-rust coating material. 6.An anti-rust coating on the surface of a steel structure, characterized in that: The anti-rust coating is prepared from the anti-rust coating material according to any one of claims 1 to 4.

7. The process for preparing the anti-rust coating on the surface of the steel structure according to claim 6, characterized in that: The following steps are involved: The anti-rust coating material is heated to 80-90° C., sprayed evenly on the surface of the electroplated steel structure using a spraying device, and naturally dried in the air to prepare the anti-rust coating.

8. The preparation process according to claim 7, characterized in that: The thickness of the anti-rust coating is 5-30 μm.

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