Photoelectrochemical cathode protection adhesive paste and preparation method thereof

Abstract

The present invention belongs to a method for preparing an anti-corrosion adhesive paste, specifically a photoelectrochemical cathodic protection adhesive paste and a preparation method thereof applied to railway steel structures, especially scissor braces, bolts and nuts, flanges and other special-shaped node structures of steel structures. The adhesive paste comprises, by weight percentage, 25-27% polybutene, 5-8% organic bentonite, 31-40% titanium dioxide / zinc titanate nanocomposite material, and the balance is water. The adhesive paste prepared by the present invention has good adhesion to metal materials and good photoelectrochemical cathodic protection performance.

Description

Technical Field

[0001] The invention relates to a method for preparing an anti-corrosion adhesive paste, and specifically to a photoelectrochemical cathode protection adhesive paste applied to railway steel structures, especially to special-shaped node structures of steel structures such as scissor braces, bolts and nuts, flanges, and the like, and a preparation method thereof. Background Art

[0002] In my country, the railway-related industry is one of the main users of various materials, especially metal materials - steel. These steel structures are in open air environments all year round, especially some in coastal and salt lake areas, which are severely corroded, greatly reducing their service life and directly affecting their safe operation. Photoelectrochemical cathodic protection technology can use the photoelectric properties of semiconductor materials to convert solar energy into electrical energy and then provide cathodic protection for metal materials. It is a technology with great application potential. However, how to coat semiconductor materials on the surface of metal materials is a major problem. The hydrothermal in-situ growth method and the magnetron sputtering method can effectively coat semiconductor materials on the metal surface, but they are not suitable for large-scale industrial applications. Especially for special-shaped node structures of steel structures such as scissors braces, bolts and nuts, flanges, etc., due to their complex shapes, many gaps, edges, and corners, and uneven surfaces, it is more difficult to coat the surface. Summary of the invention

[0003] The object of the present invention is to provide a photoelectrochemical cathode protection adhesive paste and a preparation method thereof. To achieve the above object, the technical solution adopted by the present invention is:

[0004] A photoelectrochemical cathode protection adhesive paste, characterized in that the adhesive paste comprises the following components by weight: 25-27% polybutene, 5-8% organic bentonite, 31-40% titanium dioxide / zinc titanate nanocomposite material, and the balance is water.

[0005] The titanium dioxide\zinc titanate nanocomposite material is prepared by placing commercially available nano titanium dioxide (P25) in a zinc acetate solution and dispersing it uniformly to obtain a dispersion, transferring the dispersion to a reactor for a hydrothermal reaction for 1 to 2 hours; the product is centrifugally washed with 0.01M anhydrous acetic acid and deionized water in sequence, and then calcined in a muffle furnace at 500 to 550°C for 2 to 3 hours, thereby obtaining a nanoparticle titanium dioxide\zinc titanate nanocomposite material with a diameter of 18 to 25 nm.

[0006] The hydrothermal reaction temperature should be between 180°C and 200°C; each 10ml dispersion contains 0.1 to 0.5g of titanium dioxide; the concentration of the zinc acetate solution is 0.5 to 1 mol / L; and the dispersion accounts for 80 to 85% of the volume of the reactor liner.

[0007] The adhesive paste is applied to the surface of the steel body to be protected with a coating thickness of 100 to 200 μm.

[0008] The polybutene and organic bentonite are both commercially available products.

[0009] A method for preparing a photoelectrochemical cathode protection adhesive paste comprises the following steps: heating polybutene to a melted state according to the above proportion, adding organic bentonite and titanium dioxide / zinc titanate nanocomposite materials and water, stirring for 0.5-1h, and stopping heating to obtain the adhesive paste.

[0010] The advantages of the present invention are:

[0011] 1. The adhesive paste prepared by the present invention has good adhesion to metal materials and can maintain long-term photoelectrochemical cathodic protection performance.

[0012] 2. The adhesive paste prepared by the present invention has a certain plasticity and is easy to apply, and is particularly suitable for special-shaped node structures of steel structures such as scissor braces, bolts and nuts, and flanges.

[0013] 3. The photoelectrochemical cathode protection adhesive paste prepared by the present invention is simple to construct and can be completed by workers with bare hands. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The invention discloses a photoelectrochemical cathode protection adhesive paste. DETAILED DESCRIPTION

[0015] The specific implementation modes of the present invention are further described below in conjunction with examples. It should be noted that the specific implementation modes described here are only for illustrating and explaining the present invention, and are not limited to the present invention.

[0016] The substrate to be protected in the following embodiments is 304 stainless steel.

[0017] Example 1

[0018] Weigh 3.67 g of zinc acetate and dissolve it in 10 mL of deionized water. Stir for 20 minutes to obtain 40 mL of a uniform 0.5 mol / L zinc acetate solution.

[0019] Take 0.5 g of P25 titanium dioxide and disperse it in the above zinc acetate solution and continue stirring for 5 minutes to obtain the dispersion required for the hydrothermal reaction.

[0020] 40 mL of the dispersion was transferred to a 50 mL hydrothermal reactor and reacted at 200°C for 2 h. The product was washed five times by centrifugation with 0.01 M anhydrous acetic acid and deionized water, and then calcined in a muffle furnace at 550°C for 2 h to obtain a titanium dioxide\zinc titanate nanocomposite material.

[0021] Weigh 0.35 g of titanium dioxide / zinc titanate nanocomposite, 0.25 g of polybutene, 0.07 g of organic bentonite, and 3 mL of deionized water in a beaker, heat until viscous and stir evenly. The obtained photoelectrochemical cathode protection adhesive paste (see Figure 1 ).

[0022] Depend on Figure 1 It can be seen that the adhesive paste has good viscosity.

[0023] The obtained photoelectrochemical cathodic protection adhesive paste was applied on the surface of 304 stainless steel electrode with a medical scraper to test its photoelectrochemical cathodic protection effect.

[0024] The test method is to use a Pt sheet as a counter electrode, a saturated calomel electrode as a reference electrode, a 304 stainless steel electrode coated with adhesive paste as a working electrode, and a 3.5wt.% sodium chloride solution as an electrolyte solution, wherein the electrolytic cell is made of quartz glass, and the working electrode faces the simulated sunlight, which is obtained by a xenon lamp light source through an AM1.5 filter (see Table 1).

[0025] Comparative Example 1

[0026] Weigh 0.35 g of P25 nano-titanium dioxide, 0.25 g of polybutene, 0.07 g of organic bentonite, and 3 mL of deionized water, heat them in a beaker until they become viscous and stir them evenly. The obtained photoelectrochemical cathodic protection adhesive paste is tested for the photoelectrochemical cathodic protection potential (see Table 1).

[0027] Comparative Example 2

[0028] 0.25 g of polybutene, 0.07 g of organic bentonite, and 3 mL of deionized water were heated in a beaker until viscous and stirred evenly. The obtained adhesive paste without semiconductor material was tested for photoelectrochemical cathodic protection potential (see Table 1).

[0029] The above-mentioned comparative adhesive paste was subjected to a photoelectrochemical cathodic protection test in the manner described in Example 1.

[0030] Table 1

[0031]

[0032] It can be seen from Table 1 that the photoelectrochemical cathodic protection adhesive paste prepared in Example 1 has the best photoelectrochemical cathodic protection effect. This shows that zinc titanate has an improved performance on the photoelectrochemical cathodic protection performance of titanium dioxide.

[0033] Example 2

[0034] Different amounts of 0.734, 2.2, 3.67, 5.138, 6.6, 7.34, 22.02, and 36.7 g of zinc acetate were weighed and dissolved in 10 mL of deionized water, respectively, and stirred for 30 minutes to obtain 40 mL of uniform zinc acetate solutions of different concentrations.

[0035] Take 0.3 g of P25 titanium dioxide and disperse it in the above zinc acetate solution and continue stirring for 5 minutes to obtain the dispersion required for the hydrothermal reaction.

[0036] 40 mL of the dispersion was transferred to a 50 mL hydrothermal reactor and reacted at 180°C for 2 h. The product was washed five times with 0.01 M anhydrous acetic acid and deionized water, and then calcined in a muffle furnace at 500°C for 3 h to obtain a titanium dioxide / zinc titanate nanocomposite material.

[0037] Weigh 0.40 g of titanium dioxide / zinc titanate nanocomposite, 0.27 g of polybutene, 0.05 g of organic bentonite, and 3.4 mL of deionized water, heat them in a beaker until they become viscous and stir them evenly to obtain the photoelectrochemical cathode protection adhesive paste.

[0038] The above adhesive paste was subjected to a photoelectrochemical cathodic protection test in the manner described in Example 1 (see Table 2).

[0039] Table 2

[0040]

[0041] As can be seen from Table 2, the adhesive paste prepared when the zinc acetate concentration is 0.5-1 mol / L has the best photoelectrochemical cathodic protection effect. This shows that the photoelectrochemical cathodic protection adhesive paste with a specific zinc titanate content is beneficial to the special photoelectrochemical cathodic protection performance.

Claims

1. A photoelectrochemical cathodic protection adhesive paste, characterized in that: The adhesive paste comprises, by weight percentage, 25-27% polybutene, 5-8% organic bentonite, 31-40% titanium dioxide / zinc titanate nanocomposite material, and the balance is water; The titanium dioxide\zinc titanate nanocomposite material is prepared by placing commercially available nano titanium dioxide P25 in a zinc acetate solution and dispersing it uniformly to obtain a dispersion, transferring the dispersion to a reactor for a hydrothermal reaction for 1 to 2 hours; the product is sequentially washed by centrifugation with 0.01 M anhydrous acetic acid and deionized water, and then calcined in a muffle furnace at 500 to 550° C. for 2 to 3 hours to obtain a nanoparticle titanium dioxide\zinc titanate nanocomposite material with a diameter of 18 to 25 nm; The hydrothermal reaction temperature is between 180°C and 200°C; each 10 ml dispersion contains 0.1 to 0.5 g of titanium dioxide; the concentration of the zinc acetate solution is 0.5 to 1 mol / L; the dispersion accounts for 80 to 85% of the volume of the reactor tank; The adhesive paste is applied to the surface of the steel body to be protected with a coating thickness of 100-200 μm.

2. A method for preparing the photoelectrochemical cathodic protection adhesive paste according to claim 1, characterized in that: According to the above proportions, heat polybutene to a melted state, add organic bentonite, titanium dioxide\zinc titanate nanocomposite and water, stir for 0.5-1 h, and stop heating to obtain an adhesive paste.

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