Anti-corrosion material for special-shaped component and preparation method of anti-corrosion material

Abstract

The invention provides an anticorrosive material for a special-shaped component and a preparation method thereof, and the anticorrosive material comprises the following components in parts by weight: 20-60 parts of a polyurethane elastomer, 5-30 parts of a vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2-8 parts of a polyaniline corrosion inhibitor, 1-10 parts of a benzotriazole ultraviolet light absorber, 1-10 parts of a light hindered amine stabilizer and 2-6 parts of titanium dioxide. 15-40 parts of C12 alkane, 5-10 parts of mineral oil and 1-8 parts of castor oil. According to the invention, the polyurethane elastomer has high strength, and the terpolymer has excellent salt tolerance; a polyaniline corrosion inhibitor is adopted, a compact passive film is formed on the surface of a metal base material by relying on the oxidation-reduction property of polyaniline, and the formation of the passive film greatly delays the corrosion of metal; in the same way, according to the oxidation-reduction property of polyaniline, polyaniline is reduced while polyaniline oxidizes metal to form a compact passive film, and the reduced polyaniline is an insulator to prevent transmission of corrosive charges.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion materials, and in particular to an anti-corrosion material for special-shaped components and a preparation method thereof. Background Art

[0002] At present, the protective materials of special-shaped components in heavy corrosion environments of petroleum refining, oilfield ground engineering and marine engineering cannot be recycled. After the anti-corrosion materials reach a certain service life, they are sandblasted and re-applied with new anti-corrosion materials. In addition, flanges, valves, bolts, etc. are exposed to harsh environments for a long time, and the components are severely corroded. The corrosion problem is more serious due to the complex structure of special-shaped parts and the existence of gaps. Special-shaped components are the most prone to gas and liquid leakage. Leakage of the medium will have dangerous consequences, which will not only affect the production of the enterprise, but may also cause huge economic losses and damage to the environment. Summary of the invention

[0003] In view of this, the present invention proposes an anti-corrosion material for special-shaped components and a preparation method, aiming to solve the problem that existing anti-corrosion materials are difficult to recycle. Specifically, the first aspect of the present invention proposes an anti-corrosion material for special-shaped components, comprising the following components in parts by weight: 20 to 60 parts of polyurethane elastomer, 5 to 30 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2 to 8 parts of polyaniline corrosion inhibitor, 1 to 10 parts of benzotriazole ultraviolet absorber, 1 to 10 parts of light hindered amine stabilizer, 2 to 6 parts of titanium dioxide, 15 to 40 parts of C 12 Alkanes, 5-10 parts of mineral oil and 1-8 parts of castor oil.

[0004] Furthermore, the anti-corrosion material for the special-shaped component includes the following components in parts by weight: 35-40 parts of polyurethane elastomer, 15-20 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4-6 parts of polyaniline corrosion inhibitor, 2-4 parts of benzotriazole ultraviolet absorber, 2-4 parts of light hindered amine stabilizer, 4-6 parts of titanium dioxide, 25-28 parts of C 12 Alkanes, 3-6 parts of mineral oil and 3-7 parts of castor oil.

[0005] Furthermore, the anti-corrosion material for the special-shaped component includes the following components in parts by weight: 35 parts of polyurethane elastomer, 20 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 6 parts of polyaniline corrosion inhibitor, 2 parts of benzotriazole ultraviolet absorber, 2 parts of light hindered amine stabilizer, 4 parts of titanium dioxide, 28 parts of C 12 alkane, 6 parts mineral oil and 7 parts castor oil.

[0006] Furthermore, the anti-corrosion material for the special-shaped component includes the following components in parts by weight: 40 parts of polyurethane elastomer, 15 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4 parts of polyaniline corrosion inhibitor, 2 parts of benzotriazole ultraviolet absorber, 2 parts of light hindered amine stabilizer, 5 parts of titanium dioxide, 26 parts of C 12 alkane, 3 parts mineral oil and 3 parts castor oil.

[0007] Furthermore, in the above-mentioned anti-corrosion material for special-shaped components, the polyurethane elastomer may be an aliphatic urethane polyurethane elastomer having a molecular weight of 6000-12000.

[0008] Furthermore, in the above-mentioned anti-corrosion material for special-shaped components, the vinyl chloride-vinyl acetate-dicarbonic acid terpolymer includes the following components in weight percentage: 84wt% of vinyl chloride, 15wt% of vinyl acetate and 1wt% of dicarbonic acid.

[0009] Furthermore, in the above-mentioned anti-corrosion material for special-shaped components, the titanium dioxide is rutile titanium dioxide.

[0010] The first aspect of the present invention provides an anti-corrosion material for special-shaped components. The polyurethane elastomer used has high strength, and the terpolymer has excellent water resistance, oil resistance, acid resistance, alkali resistance and salt resistance. The polyaniline green corrosion inhibitor is used to form a dense oxide film (passivation film) on the surface of the metal substrate by relying on the redox property of the polyaniline. The formation of the passivation film greatly delays the corrosion of the metal. Similarly, based on the redox property of the polyaniline, while the polyaniline oxidizes the metal to form a dense passivation film, the polyaniline is reduced. The reduced polyaniline is an insulator, which prevents the transfer of corrosion charges. The use of ultraviolet absorbers, light hindered amine stabilizers, and titanium dioxide can improve the anti-light aging performance of the anti-corrosion material. Mineral oil and castor oil are used as solvents of the system to give the anti-corrosion material excellent processing performance. The anti-corrosion material of the present invention can be stripped and reused during device inspection and maintenance, is green and environmentally friendly, and has excellent protective effect on the corrosion of special-shaped parts, and is suitable for working conditions with very low C1 to extremely corrosive levels of CX.

[0011] The second aspect of the present invention provides a method for preparing an anti-corrosion material for a special-shaped component, comprising the following steps: 20 to 60 parts of a polyurethane elastomer, 5 to 30 parts of a vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2 to 8 parts of a polyaniline corrosion inhibitor, 1 to 10 parts of a benzotriazole ultraviolet absorber, 1 to 10 parts of a light hindered amine stabilizer, 2 to 6 parts of titanium dioxide, and 15 to 40 parts of C 12 Alkane, 5 to 10 parts of mineral oil and 1 to 8 parts of castor oil are mixed, heated to a preset temperature and stirred for a preset time, and then cooled to obtain a special-shaped component anti-corrosion material.

[0012] Furthermore, in the method for preparing the anti-corrosion material for the above-mentioned special-shaped components, the preset temperature is 150-190° C., and the preset time is 20-60 minutes. DETAILED DESCRIPTION

[0013] The following is a preferred embodiment of the present invention. It should be noted that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

[0014] The anticorrosive material for special-shaped components of the embodiment of the present invention comprises the following components in parts by weight: 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, 15-40 parts of C 12 Alkanes, 5-10 parts of mineral oil and 1-8 parts of castor oil.

[0015] Specifically, the polyurethane elastomer can be an aliphatic urethane polyurethane elastomer TPU with a molecular weight of 6000-12000, which has excellent physical and mechanical properties. Compared with conventional vinyl and other thermoplastic elastomers, it has the advantages of high tensile strength and strong heavy-duty anti-corrosion performance. The molecular weight contains strong hydrogen bonds to improve adhesion, and the presence of aliphatic urethane functional groups makes it very resistant to aging, breaking through the defects of poor tensile adhesion of conventional thermoplastic elastomers and the application field limitations of being unsuitable for heavy-duty anti-corrosion C3-CX working conditions.

[0016] The vinyl chloride-vinyl acetate-dicarbonate terpolymer may be VINNOL E 15 / 45 M vinyl chloride-vinyl acetate-dicarbonate terpolymer, which is composed of 84 wt% of vinyl chloride (VC), 15 wt% of vinyl acetate, and 1 wt% of dicarbonate, and has high stability, permanent flexibility, high wear resistance, and low gas permeability.

[0017] In this embodiment, polyaniline corrosion inhibitor is used. The redox property of polyaniline is relied on to form a dense oxide film (passivation film) on the surface of the metal substrate. The formation of the passivation film greatly slows down the corrosion degree of the metal. Similarly, based on the redox property of polyaniline, while polyaniline oxidizes the metal to form a dense passivation film, the polyaniline is reduced. The reduced polyaniline is an insulator, which prevents the transfer of corrosion charges and also greatly slows down the corrosion rate of the metal.

[0018] Benzotriazole UV absorbers can use Tinuvin 1130, which can absorb harmful ultraviolet radiation and dissipate energy in the form of heat without causing photosensitization reaction; light hindered amine stabilizers can use TINUVIN 292, which mainly captures free radicals generated during light aging of the coating through free radical scavengers, including alkyl free radicals, alkoxy free radicals, peroxy free radicals, etc., to block these active species from further oxidative damage to the polymer network.

[0019] The titanium dioxide can be rutile titanium dioxide CR828 which has been coated with zirconium oxide / aluminum oxide and specially organically treated, and has high gloss, high weather resistance and high hiding power.

[0020] In this embodiment, ultraviolet absorbers, light hindered amine stabilizers and rutile titanium dioxide are used to improve the anti-light aging performance of the anti-corrosion material; mineral oil and castor oil are used as system solvents to give the anti-corrosion material excellent processing properties.

[0021] C 12 The alkane may be at least one of dihexane, laurane, dodecane and n-dodecane.

[0022] Wet-process sericite can shield ultraviolet light, improve the weather resistance of the coating, delay powdering and discoloration, and its high aspect ratio two-dimensional flaky structure can enhance the comprehensive mechanical properties of the coating, resist water penetration and cracking, enhance the anti-fouling and self-cleaning properties, and improve the acid, alkali and corrosion resistance of the coating. A high molecular weight block copolymer solution is selected as the system dispersant, polyether siloxane leveling agent TEGO-450 is used as the system substrate wetting and leveling agent, and BYK-093 polysiloxane and polyethylene glycol hydrophobic mixture is selected as the system defoamer to improve the appearance of the anti-corrosion material; alkanes with a carbon number of 12, mineral oil, and castor oil have excellent thermal stability and good fluidity, which significantly improve the system processing performance.

[0023] Preferably, the anti-corrosion material for special-shaped components comprises the following components in parts by weight: 35-40 parts of polyurethane elastomer, 15-20 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4-6 parts of polyaniline corrosion inhibitor, 2-4 parts of benzotriazole ultraviolet absorber, 2-4 parts of light hindered amine stabilizer, 4-6 parts of titanium dioxide, 25-28 parts of C 12 Alkanes, 3-6 parts of mineral oil and 3-7 parts of castor oil.

[0024] In a specific implementation of this embodiment, the anti-corrosion material for special-shaped components includes the following components in parts by weight: 35 parts of polyurethane elastomer, 20 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 6 parts of polyaniline corrosion inhibitor, 2 parts of benzotriazole ultraviolet absorber, 2 parts of light hindered amine stabilizer, 4 parts of titanium dioxide, 28 parts of C 12alkane, 6 parts mineral oil and 7 parts castor oil.

[0025] In another specific implementation of this embodiment, the anti-corrosion material for special-shaped components includes the following components in parts by weight: 40 parts of polyurethane elastomer, 15 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 4 parts of polyaniline corrosion inhibitor, 2 parts of benzotriazole ultraviolet absorber, 2 parts of light hindered amine stabilizer, 5 parts of titanium dioxide, 26 parts of C 12 alkane, 3 parts mineral oil and 3 parts castor oil.

[0026] In the anti-corrosion material provided by the embodiment of the present invention, the polyurethane elastomer has high strength, and the terpolymer has excellent water resistance, oil resistance, acid resistance, alkali resistance and salt resistance; polyaniline green corrosion inhibitor is used, and the redox property of polyaniline is relied on to form a dense oxide film (passivation film) on the surface of the metal substrate, and the formation of the passivation film greatly delays the corrosion of the metal; also based on the redox property of polyaniline, while polyaniline oxidizes the metal to form a dense passivation film, the polyaniline is reduced, and the reduced polyaniline is an insulator, which prevents the transfer of corrosion charges; ultraviolet absorbers, light hindered amine stabilizers, and titanium dioxide are used to improve the anti-light aging performance of the anti-corrosion material; mineral oil and castor oil are used as solvents of the system to give the anti-corrosion material excellent processing performance; the anti-corrosion material of the present invention can be stripped and reused during device inspection and maintenance, is green and environmentally friendly, and has excellent protection effect on the corrosion of special-shaped parts, and is suitable for working conditions with very low C1 to extremely corrosive levels of CX.

[0027] The present invention also provides a method for preparing an anti-corrosion material for a special-shaped component, comprising: 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, 15-40 parts of C 12 Alkane, 5 to 10 parts of mineral oil and 1 to 8 parts of castor oil are mixed, heated to a preset temperature and stirred for a preset time, and then cooled to obtain a special-shaped component anti-corrosion material.

[0028] Specifically, the preset temperature can be 150-190°C, and the preset time can be 20-60 minutes, preferably 20 minutes. After the mixture is cooled, it is placed in a corresponding fixed mold to obtain an anti-corrosion material for special-shaped components. It can be seen that the process method has a simple preparation process, does not require special equipment, and has a low preparation cost.

[0029] The present invention is described in detail below with reference to several specific embodiments.

[0030] Example 1 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 alkane with a carbon number of 12, 6 parts of mineral oil, and 7 parts of castor oil are mixed, heated, and fully stirred. The mixture is stirred and kept at 150°C-190°C for 20 minutes, and then cooled to a fixed mold to obtain an industrial heavy-duty anti-corrosion and recyclable special-shaped component anti-corrosion material.

[0031] Example 2 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 alkane with a carbon number of 12, 5 parts of mineral oil, and 5 parts of castor oil are mixed according to proportion, heated, and fully stirred. The mixture is stirred and kept warm at 150°C-190°C for 20 minutes, and then cooled to a fixed mold to obtain an industrial heavy-duty anti-corrosion and recyclable special-shaped component protective material.

[0032] The industrial heavy-duty anti-corrosion recyclable special-shaped component anti-corrosion material provided by the embodiment of the present invention can be recycled for more than 20 times, and the adhesion is 12MPa; artificial accelerated aging (5000h): no blistering, no rusting, no cracking, no delamination, no powdering; salt spray resistance (5000h): no blistering, no rusting, no cracking, no delamination; 5%H 2 SO 4 (Room temperature, 30d): no blistering, no rusting, no cracking, no delamination; 5% NaOH (Room temperature, 30d): no blistering, no rusting, no cracking, no delamination; 3% NaCl (60℃±2℃, 30d): no blistering, no rusting, no cracking, no delamination, and has good physical and mechanical properties, good construction adaptability, excellent heavy-duty anti-corrosion performance, suitable for C1-CX corrosion environment, meets the anti-corrosion performance requirements of industrial heavy-duty anti-corrosion materials, and has broad application prospects.

[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An anti-corrosion material for special-shaped components, It is characterized in that The invention comprises the following components in parts by weight: 20 to 60 parts of polyurethane elastomer, 5 to 30 parts of vinyl chloride-vinyl acetate-dicarbonate terpolymer, 2 to 8 parts of polyaniline corrosion inhibitor, 1 to 10 parts of benzotriazole ultraviolet absorber, 1 to 10 parts of light hindered amine stabilizer, 2 to 6 parts of titanium dioxide, 15 to 40 parts of C 12 Alkanes, 5-10 parts of mineral oil and 1-8 parts of castor oil.

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

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

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

5. The anti-corrosion material for special-shaped components according to claim 1, It is characterized in that The polyurethane elastomer may be an aliphatic urethane polyurethane elastomer having a molecular weight of 6,000-12,000.

6. The anti-corrosion material for special-shaped components according to claim 1, It is characterized in that The vinyl chloride-vinyl acetate-dicarbonic acid terpolymer includes the following components in weight percentage: 84 wt % of vinyl chloride, 15 wt % of vinyl acetate and 1 wt % of dicarbonic acid.

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

8. A method for preparing an anti-corrosion material for a special-shaped component. It is characterized in that The following steps are involved: 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, 15-40 parts of C 12 Alkane, 5 to 10 parts of mineral oil and 1 to 8 parts of castor oil are mixed, heated to a preset temperature and stirred for a preset time, and then cooled to obtain a special-shaped component anti-corrosion material.

9. The method for preparing the anti-corrosion material for special-shaped components according to claim 8, It is characterized in that The following steps are involved: The preset temperature is 150-190° C., and the preset time is 20-60 minutes.