Anti-corrosion material for special-shaped member and preparation method thereof

Abstract

The application provides a corrosion-proof material for special-shaped components and a preparation method thereof, which comprises the following components in parts by weight: 20-60 parts of polyurethane elastomer, 5-30 parts of a chloroethylene-vinyl acetate-dicarbonate terpolymer, 2-8 parts of a polyaniline corrosion inhibitor, 1-10 parts of a benzotriazole ultraviolet absorber, 1-10 parts of a hindered amine light stabilizer, 2-6 parts of titanium white, 15-40 parts of C12 alkane, 5-10 parts of mineral oil and 1-8 parts of castor oil. The polyurethane elastomer has high strength, and the terpolymer has excellent salt resistance. The polyaniline corrosion inhibitor forms a dense passivation film on the surface of a metal substrate by virtue of the oxidation and reduction properties of polyaniline, and the formation of the passivation film greatly delays the corrosion of the metal. According to the oxidation and reduction properties of polyaniline, the polyaniline is reduced while the dense passivation film is formed on the polyaniline oxidized metal, and the reduced polyaniline is an insulator, preventing the transmission of corrosion charges.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion materials technology, and more specifically, to an anti-corrosion material for irregularly shaped components and its preparation method. Background Technology

[0002] Currently, protective materials for irregularly shaped components in heavy-duty corrosion environments in petroleum refining, oilfield surface engineering, and marine engineering are not recyclable. After a certain service life, these materials are sandblasted and new materials are applied. Furthermore, flanges, valves, bolts, and other components are exposed to harsh environments for extended periods, resulting in severe corrosion. Due to the complex structure and gaps in irregularly shaped components, corrosion is exacerbated. These components are the most prone to gas and liquid leaks, which can have dangerous consequences, impacting production, causing significant economic losses, and damaging the environment. Summary of the Invention

[0003] In view of this, the present invention proposes an anti-corrosion material for irregularly shaped components and a preparation method thereof, aiming to solve the problem that existing anti-corrosion materials are difficult to recycle.

[0004] Specifically, the first aspect of this invention provides an anti-corrosion material for irregularly shaped components, comprising the following components in parts by weight: 20-60 parts polyurethane elastomer, 5-30 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts polyaniline corrosion inhibitor, 1-10 parts benzotriazole ultraviolet absorber, 1-10 parts light-hindered amine stabilizer, 2-6 parts titanium dioxide, and 15-40 parts C 12 Alkanes, 5-10 parts mineral oil and 1-8 parts castor oil.

[0005] Furthermore, the aforementioned anti-corrosion material for irregularly shaped components comprises the following components in parts by weight: 35-40 parts polyurethane elastomer, 15-20 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4-6 parts polyaniline corrosion inhibitor, 2-4 parts benzotriazole ultraviolet absorber, 2-4 parts light-hindered amine stabilizer, 4-6 parts titanium dioxide, and 25-28 parts C 12 Alkanes, 3 to 6 parts mineral oil, and 3 to 7 parts castor oil.

[0006] Furthermore, the aforementioned anti-corrosion material for irregularly shaped components comprises the following components in parts by weight: 35 parts polyurethane elastomer, 20 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 6 parts polyaniline corrosion inhibitor, 2 parts benzotriazole ultraviolet absorber, 2 parts light-hindered amine stabilizer, 4 parts titanium dioxide, and 28 parts C 12 Alkanes, 6 parts mineral oil and 7 parts castor oil.

[0007] Furthermore, the aforementioned anti-corrosion material for irregularly shaped components comprises the following components in parts by weight: 40 parts polyurethane elastomer, 15 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4 parts polyaniline corrosion inhibitor, 2 parts benzotriazole ultraviolet absorber, 2 parts light-hindered amine stabilizer, 5 parts titanium dioxide, and 26 parts C 12 Alkanes, 3 parts mineral oil, and 3 parts castor oil.

[0008] Furthermore, in the aforementioned anti-corrosion material for irregularly shaped components, the polyurethane elastomer can be an aliphatic urethane polyurethane elastomer with a molecular weight of 6000-12000.

[0009] Furthermore, in the aforementioned anti-corrosion material for irregularly shaped components, the vinyl chloride-vinyl acetate-dicarbonate terpolymer comprises the following components by weight percentage: 84 wt% vinyl chloride, 15 wt% vinyl acetate, and 1 wt% dicarbonate.

[0010] Furthermore, in the aforementioned anti-corrosion material for irregularly shaped components, the titanium dioxide is rutile titanium dioxide.

[0011] The first aspect of this invention provides an anti-corrosion material for irregularly shaped components. The polyurethane elastomer used has high strength, and the terpolymer exhibits excellent water resistance, oil resistance, acid resistance, alkali resistance, and salt resistance. A green polyaniline corrosion inhibitor is employed, relying on the redox properties of polyaniline to form a dense oxide film (passivation film) on the surface of the metal substrate. The formation of this passivation film significantly delays metal corrosion. Similarly, based on the redox properties of polyaniline, while polyaniline oxidizes the metal to form a dense passivation film, polyaniline is also reduced. The reduced polyaniline acts as an insulator, preventing the transfer of corrosion charges. The use of ultraviolet absorbers, light-hindered amine stabilizers, and titanium dioxide improves the anti-aging properties of the anti-corrosion material. Mineral oil and castor oil are used as solvents in the system, giving the anti-corrosion material excellent processing performance. The anti-corrosion material of this invention can be peeled off and reused during equipment maintenance, is environmentally friendly, and provides excellent protection for irregularly shaped components, suitable for environments with very low C1 to CX extreme corrosion levels.

[0012] The second aspect of this invention provides a method for preparing an anti-corrosion material for irregularly shaped components, comprising the following steps: mixing 20-60 parts of polyurethane elastomer, 5-30 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts of polyaniline corrosion inhibitor, 1-10 parts of benzotriazole ultraviolet absorber, 1-10 parts of light-hindered amine stabilizer, 2-6 parts of titanium dioxide, and 15-40 parts of C 12 Alkane, 5-10 parts mineral oil and 1-8 parts castor oil are mixed, heated to a preset temperature and stirred for a preset time, and then cooled to obtain an anti-corrosion material for irregularly shaped components.

[0013] Furthermore, in the above-mentioned method for preparing anti-corrosion materials for irregularly shaped components, the preset temperature is 150-190℃ and the preset time is 20-60min. Detailed Implementation

[0014] The following describes preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

[0015] The corrosion-resistant material for irregularly shaped components in this embodiment of the invention comprises the following components in parts by weight: 20-60 parts polyurethane elastomer, 5-30 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts polyaniline corrosion inhibitor, 1-10 parts benzotriazole ultraviolet absorber, 1-10 parts light-hindered amine stabilizer, 2-6 parts titanium dioxide, and 15-40 parts C 12 Alkanes, 5-10 parts mineral oil and 1-8 parts castor oil.

[0016] Specifically, the polyurethane elastomer can be an aliphatic urethane polyurethane elastomer (TPU) with a molecular weight of 6,000-12,000. It has excellent physical and mechanical properties and has the advantages of high pull strength and strong anti-corrosion performance compared with conventional thermoplastic elastomers such as vinyl. The molecular weight contains strong hydrogen bonds, which improves adhesion. The presence of aliphatic urethane functional groups makes it very resistant to aging. It overcomes the defects of poor pull adhesion of conventional thermoplastic elastomers and the application field limitations of not being suitable for heavy-duty anti-corrosion C3-CX working conditions.

[0017] Vinyl chloride-vinyl acetate-dicarbonate terpolymer can be VINNOL E 15 / 45 M vinyl chloride-vinyl acetate-dicarbonate terpolymer, which consists of 84 wt% vinyl chloride (VC), 15 wt% vinyl acetate, and 1 wt% dicarbonate. It has high stability, permanent flexibility, high abrasion resistance, and low gas permeability.

[0018] In this embodiment, polyaniline corrosion inhibitor is used. The redox properties of polyaniline enable the formation of a dense oxide film (passivation film) on the surface of the metal substrate. The formation of the passivation film greatly slows down the corrosion of the metal. Similarly, based on the redox properties of polyaniline, while polyaniline oxidizes the metal to form a dense passivation film, polyaniline is reduced. The reduced polyaniline is an insulator, which prevents the transfer of corrosion charge and also greatly slows down the corrosion rate of the metal.

[0019] Benzotriazole UV absorbers such as Tinuvin 1130 can absorb harmful UV radiation and dissipate the energy as heat without causing photosensitization. Photohindered amine stabilizers such as TINUVIN 292 can be selected, which mainly captures free radicals generated during the photoaging of the coating, including alkyl radicals, alkoxy radicals, and peroxy radicals, and blocks these active species from further oxidizing and damaging the polymer network.

[0020] Titanium dioxide can be rutile titanium dioxide CR828, which is coated with zirconium oxide / alumina and treated with special organic agents, and has high gloss, high weather resistance and high hiding power.

[0021] In this embodiment, ultraviolet absorbers, light-hindered amine stabilizers, and rutile titanium dioxide are used to improve the anti-photoaging properties of the anti-corrosion material; mineral oil and castor oil are used as solvents in the system to give the anti-corrosion material excellent processing performance.

[0022] C 12 The alkane can be at least one of hexane, laurylane, dodecane, and n-dodecane.

[0023] Wet-processed sericite can shield against ultraviolet radiation, improve the weather resistance of the coating, and delay chalking and discoloration. Furthermore, its high aspect ratio two-dimensional lamellar structure enhances the overall mechanical properties of the coating, improving water penetration resistance, crack resistance, and self-cleaning properties. It also improves the coating's acid and alkali resistance and corrosion resistance. A high molecular weight block copolymer solution is selected as the system dispersant, and TEGO-450, a polyether siloxane leveling agent, is used as the system's base material wetting and leveling agent. BYK-093, a hydrophobic mixture of polysiloxane and polyethylene glycol, is used as the system defoamer to improve the appearance of the anti-corrosion material. Alkanes with 12 carbon atoms, mineral oil, and castor oil exhibit excellent thermal stability and good fluidity, significantly improving the system's processing performance.

[0024] Preferably, the corrosion-resistant material for irregularly shaped components comprises the following components in parts by weight: 35-40 parts polyurethane elastomer, 15-20 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4-6 parts polyaniline corrosion inhibitor, 2-4 parts benzotriazole ultraviolet absorber, 2-4 parts light-hindered amine stabilizer, 4-6 parts titanium dioxide, and 25-28 parts C 12 Alkanes, 3 to 6 parts mineral oil, and 3 to 7 parts castor oil.

[0025] In one specific embodiment of this example, the anti-corrosion material for irregularly shaped components comprises the following components in parts by weight: 35 parts polyurethane elastomer, 20 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 6 parts polyaniline corrosion inhibitor, 2 parts benzotriazole ultraviolet absorber, 2 parts light-hindered amine stabilizer, 4 parts titanium dioxide, and 28 parts C 12Alkanes, 6 parts mineral oil and 7 parts castor oil.

[0026] In another specific embodiment of this example, the corrosion-resistant material for irregularly shaped components comprises the following components in parts by weight: 40 parts polyurethane elastomer, 15 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4 parts polyaniline corrosion inhibitor, 2 parts benzotriazole ultraviolet absorber, 2 parts light-hindered amine stabilizer, 5 parts titanium dioxide, and 26 parts C 12 Alkanes, 3 parts mineral oil, and 3 parts castor oil.

[0027] In the anti-corrosion material provided by this invention, the polyurethane elastomer has high strength, and the terpolymer has excellent water resistance, oil resistance, acid resistance, alkali resistance, and salt resistance. A green polyaniline corrosion inhibitor is used, relying on the redox properties of polyaniline to form a dense oxide film (passivation film) on the surface of the metal substrate. The formation of the passivation film greatly delays metal corrosion. Similarly, based on the redox properties of polyaniline, while polyaniline oxidizes the metal to form a dense passivation film, polyaniline is reduced. The reduced polyaniline is an insulator, preventing the transfer of corrosion charges. The use of ultraviolet absorbers, light-hindered amine stabilizers, and titanium dioxide can improve the anti-photoaging performance of the anti-corrosion material. Using mineral oil and castor oil as solvents in the system imparts excellent processing performance to the anti-corrosion material. The anti-corrosion material of this invention can be peeled off and reused during equipment maintenance, is environmentally friendly, and has excellent protective effects on irregularly shaped parts, suitable for working environments with very low C1 to CX extreme corrosion levels.

[0028] This invention also provides a method for preparing an anti-corrosion material for irregularly shaped components, comprising:

[0029] The following ingredients are added: 20-60 parts polyurethane elastomer, 5-30 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts polyaniline corrosion inhibitor, 1-10 parts benzotriazole ultraviolet absorber, 1-10 parts light-hindered amine stabilizer, 2-6 parts titanium dioxide, and 15-40 parts C. 12 Alkane, 5-10 parts mineral oil and 1-8 parts castor oil are mixed, heated to a preset temperature and stirred for a preset time, and then cooled to obtain an anti-corrosion material for irregularly shaped components.

[0030] Specifically, the preset temperature can be 150-190℃, and the preset time can be 20-60 minutes, preferably 20 minutes. After cooling, the mixture is placed in a corresponding fixed mold to obtain the anti-corrosion material for irregularly shaped components. It can be seen that this process is simple, requires no special equipment, and has low production costs.

[0031] The present invention will now be described in detail with reference to several specific embodiments.

[0032] Example 1

[0033] 35 parts of polyurethane elastomer (TPU), 20 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 6 parts of polyaniline green corrosion inhibitor, 2 parts of Tinuvin 1130 benzotriazole UV absorber, 2 parts of TINUVIN 292 light-hindered amine stabilizer, 4 parts of rutile titanium dioxide, 28 parts of 12-carbon alkane, 6 parts of mineral oil, and 7 parts of castor oil were mixed, heated, and stirred thoroughly. The mixture was kept at 150℃-190℃ and stirred for 20 minutes, then cooled into a fixed mold to obtain an industrial heavy-duty anti-corrosion recyclable irregular-shaped component anti-corrosion material.

[0034] Example 2

[0035] 38 parts of polyurethane elastomer (TPU), 26 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 8 parts of polyaniline green corrosion inhibitor, 2 parts of Tinuvin 1130 benzotriazole UV absorber, 2 parts of TINUVIN 292 light-hindered amine stabilizer, 6 parts of rutile titanium dioxide, 25 parts of 12-carbon alkane, 5 parts of mineral oil, and 5 parts of castor oil were mixed in proportion, heated, and stirred thoroughly. The mixture was kept at 150℃-190℃ and stirred for 20 minutes, then cooled into a fixed mold to obtain an industrial heavy-duty anti-corrosion recyclable irregular-shaped component protective material.

[0036] The industrial heavy-duty anti-corrosion recyclable anti-corrosion material for irregularly shaped components provided in this invention embodiment can be recycled more than 20 times, with an adhesion of 12MPa; artificial accelerated aging (5000h): no blistering, no rusting, no cracking, no delamination, and no powdering; salt spray resistance (5000h): no blistering, no rusting, no cracking, and no delamination; 5% H2SO4 (room temperature, 30d): no blistering, no rusting, no cracking, and no delamination; 5% NaOH (room temperature, 30d): no blistering, no rusting, no cracking, and no delamination; 3% NaCl (60℃±2℃, 30d): no blistering, no rusting, no cracking, and no delamination. It also possesses good physical and mechanical properties, good construction adaptability, excellent heavy-duty anti-corrosion performance, and is suitable for Cl-CX corrosive environments, meeting the anti-corrosion performance requirements of industrial heavy-duty anti-corrosion materials and having broad application prospects.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A corrosion-resistant material for irregularly shaped components, characterized in that, The components include the following parts by weight: 20-60 parts polyurethane elastomer, 5-30 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts polyaniline corrosion inhibitor, 1-10 parts benzotriazole UV absorber, 1-10 parts light-hindered amine stabilizer, 2-6 parts titanium dioxide, and 15-40 parts C. 12 The composition includes alkanes, 5-10 parts mineral oil, and 1-8 parts castor oil; the polyurethane elastomer is an aliphatic urethane polyurethane elastomer with a molecular weight of 6000-12000; the vinyl chloride-vinyl acetate-dicarbonate terpolymer comprises the following components by weight percentage: 84 wt% vinyl chloride, 15 wt% vinyl acetate, and 1 wt% dicarbonate.

2. The anti-corrosion material for irregularly shaped components according to claim 1, characterized in that, The composition includes the following components in parts by weight: 35–40 parts polyurethane elastomer, 15–20 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4–6 parts polyaniline corrosion inhibitor, 2–4 parts benzotriazole UV absorber, 2–4 parts light-hindered amine stabilizer, 4–6 parts titanium dioxide, and 25–28 parts C. 12 Alkanes, 3 to 6 parts mineral oil, and 3 to 7 parts castor oil.

3. The anti-corrosion material for irregularly shaped components according to claim 1, characterized in that, The components include the following parts by weight: 35 parts polyurethane elastomer, 20 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 6 parts polyaniline corrosion inhibitor, 2 parts benzotriazole UV absorber, 2 parts light-hindered amine stabilizer, 4 parts titanium dioxide, and 28 parts C. 12 Alkanes, 6 parts mineral oil and 7 parts castor oil.

4. The anti-corrosion material for irregularly shaped components according to claim 1, characterized in that, The components include the following parts by weight: 40 parts polyurethane elastomer, 15 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4 parts polyaniline corrosion inhibitor, 2 parts benzotriazole UV absorber, 2 parts light-hindered amine stabilizer, 5 parts titanium dioxide, and 26 parts C. 12 Alkanes, 3 parts mineral oil, and 3 parts castor oil.

5. The anti-corrosion material for irregularly shaped components according to claim 1, characterized in that, The titanium dioxide is rutile titanium dioxide.

6. A method for preparing an anti-corrosion material for irregularly shaped components, characterized in that, Includes the following steps: The following ingredients are added: 20-60 parts polyurethane elastomer, 5-30 parts vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts polyaniline corrosion inhibitor, 1-10 parts benzotriazole ultraviolet absorber, 1-10 parts light-hindered amine stabilizer, 2-6 parts titanium dioxide, and 15-40 parts C. 12 Alkane, 5-10 parts mineral oil and 1-8 parts castor oil are mixed, heated to a preset temperature and stirred for a preset time, and then cooled to obtain an anti-corrosion material for irregularly shaped components.

7. The method for preparing the anti-corrosion material for irregularly shaped components according to claim 6, characterized in that, Includes the following steps: The preset temperature is 150-190℃, and the preset duration is 20-60min.