Steel ball valve

Abstract

The invention relates to a steel ball valve which comprises a ball valve main body, and the surface of the ball valve main body is treated by an antirust agent comprising the following components: pyridine-3-carboxylic acid acyl chloride, n-butylamine thiocyanate, p-formylbenzoic acid, 4-hexylbenzaldehyde, pyrrole, p-toluene sulfonic acid, propionic acid, absolute ethyl alcohol, polyethylene glycol and dichloromethane. The application has the following advantages and effects: an acyl chloride group in pyridine-3-carboxylic acid acyl chloride reacts with n-butylamine thiocyanate, and a-N = C = S group is introduced to improve the corrosion inhibition performance; p-methylbenzenesulfonic acid catalyzes p-formylbenzoic acid, 4-hexylbenzaldehyde and pyrrole to react to obtain a porphyrin compound, the porphyrin compound has hydrophilic carboxyl and a hydrophobic long carbon chain, and the overall amphoteric balance of the antirust agent is improved; the acyl isothiocyanate compound and the porphyrin compound have a synergistic effect to enhance the rust prevention and corrosion inhibition performance of the ball valve main body, so that the corrosion generated when the steel ball valve is exposed in a humid environment for a long time is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of ball valves, and in particular to a steel ball valve. Background Art

[0002] The application scope of steel ball valves includes various pipeline equipment such as city gas, city heating, petrochemical, shipbuilding, steel, pressure regulating stations, power plants, etc.; they can operate reliably for a long time, require no maintenance, are easy to operate, and make the installation of valves more convenient, saving engineering time and reducing engineering costs.

[0003] With respect to the above-mentioned related technologies, the inventors believe that the current steel ball valves may still rust when exposed to a humid environment for a long time, which may affect the service life of the ball valve, and there is still room for improvement. Summary of the invention

[0004] In order to reduce the rust of a steel ball valve when it is exposed to a humid environment for a long time and extend the service life of the ball valve, the present application provides a steel ball valve.

[0005] The steel ball valve provided in this application adopts the following technical solution:

[0006] A steel ball valve, comprising a ball valve body, characterized in that the surface of the ball valve body is treated with a rust inhibitor comprising the following components in parts by weight:

[0007] 30-35 parts of pyridine-3-carboxylic acid chloride;

[0008] 20-25 parts of n-butylamine thiocyanate;

[0009] 5-6 parts of p-formylbenzoic acid;

[0010] 5-6 parts of 4-hexylbenzaldehyde;

[0011] 10-12 parts of pyrrole;

[0012] 1.6-2 parts p-toluenesulfonic acid;

[0013] 50-60 parts of propionic acid;

[0014] 15-20 parts of anhydrous ethanol;

[0015] 5-6 parts of polyethylene glycol;

[0016] 10-12 parts of dichloromethane.

[0017] By adopting the above technical scheme, the acyl chloride group in pyridine-3-carboxylic acid chloride is reacted with n-butylamine thiocyanate to first obtain an acyl isothiocyanate compound, and the -N=C=S group is introduced to improve the corrosion inhibition performance. At the same time, the central N atom of the pyridine group contains a lone pair of electrons to provide a residual valence bond, and can also improve the binding with the ball valve body; in addition, the reaction of p-formylbenzoic acid, 4-hexylbenzaldehyde and pyrrole is further catalyzed by p-toluenesulfonic acid to obtain a porphyrin compound having both a hydrophilic carboxyl group and a hydrophobic long carbon chain, which can improve the overall amphoteric balance of the rust inhibitor on the one hand, and on the other hand, the acyl isothiocyanate compound and the porphyrin compound have a synergistic effect to enhance the rust and corrosion inhibition of the ball valve body, reduce the rust generated by the steel ball valve when it is exposed to a humid environment for a long time, and extend the service life of the ball valve.

[0018] Preferably, the rust inhibitor further comprises 5-7 parts by weight of 1-hexadecanethiol.

[0019] By adopting the above technical scheme, 1-hexadecanethiol can be combined with the surface of the ball valve body to form a highly ordered monolayer. These monolayers have excellent chemical stability and hydrophobicity. By blending 1-hexadecanethiol with acyl isothiocyanate compounds and porphyrin compounds, they are arranged into an ordered monolayer on the surface of the ball valve body, which assists in forming a dense protective film and obtains a better anti-rust effect.

[0020] Preferably, the rust inhibitor further comprises 3-4 parts of isopentenyl mercaptan acetate and 3-4 parts of toluene by weight.

[0021] By adopting the above technical scheme, through the introduction of carbon-carbon double bonds, the adsorption effect of π bonds is achieved, so that the rust inhibitor can be better adsorbed on the surface of the ball valve body. When a polar group is close to the π bond, a large π bond will be formed due to conjugation, thereby enhancing the adsorption effect. At the same time, the sulfur bond contained in isopentenyl mercaptan acetate also helps to compound with 1-hexadecanethiol to assist in improving the anti-rust performance.

[0022] Preferably, the rust inhibitor further comprises 2-3 parts by weight of 1,6-hexamethylenediphosphonic acid.

[0023] By adopting the above technical scheme, using p-toluenesulfonic acid as a catalyst, the isopentenyl mercaptan acetate carrying a carbonyl group is reacted with 1,6-hexamethylenediphosphonic acid to modify the reaction to introduce a phosphine group that can improve the anti-rust performance, and then compounded with 1-hexadecanethiol to further improve the anti-rust and corrosion inhibition performance.

[0024] Preferably, the weight ratio is: 1-hexadecanethiol: isopentenyl mercaptan acetate: 1,6-hexamethylenediphosphonic acid = 3:2:1.

[0025] Preferably, the processing process of the ball valve body comprises the following steps:

[0026] S1. Preparation of rust remover; pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, 0.8-1 parts of polyethylene glycol and dichloromethane were mixed, stirred at room temperature for 1-1.5h, filtered, and product A was obtained;

[0027] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 131-135°C, then add p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 1-2h after the addition is complete, stir and cool to 70-75°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0028] The product A, the product B, 1-hexadecanethiol and the remaining polyethylene glycol are blended to obtain a rust remover;

[0029] S2. Spraying of rust remover; spray the rust remover prepared in S1 onto the preheated ball valve body to be treated by a spray gun, with a spraying distance of 15-25mm and a spraying pressure of 0.6-0.8Mpa. After spraying, dry at 100-120°C for 10-20min.

[0030] In summary, this application includes the following beneficial technical effects:

[0031] 1. The acyl chloride group in pyridine-3-carboxylic acid chloride is reacted with n-butylamine thiocyanate to first obtain an acyl isothiocyanate compound, and the -N=C=S group is introduced to improve the corrosion inhibition performance. At the same time, the central N atom of the pyridine group contains a lone pair of electrons, which can provide a residual valence bond and improve the binding property with the ball valve body. In addition, the reaction of p-formylbenzoic acid, 4-hexylbenzaldehyde and pyrrole is further catalyzed by p-toluenesulfonic acid to obtain a porphyrin compound having both a hydrophilic carboxyl group and a hydrophobic long carbon chain. On the one hand, the overall amphoteric balance of the rust inhibitor can be improved. On the other hand, the acyl isothiocyanate compound and the porphyrin compound have a synergistic effect, thereby enhancing the rust and corrosion inhibition of the ball valve body, reducing the rust generated by the steel ball valve when it is exposed to a humid environment for a long time, and extending the service life of the ball valve.

[0032] 2.1-Hexadecanethiol can be combined with the surface of the ball valve body to form a highly ordered monolayer. These monolayers have excellent chemical stability and hydrophobicity. 1-Hexadecanethiol is blended with acyl isothiocyanate compounds and porphyrin compounds to form an ordered monolayer on the surface of the ball valve body, which helps to form a dense protective film and obtain a better anti-rust effect.

[0033] 3. Through the introduction of carbon-carbon double bonds, the adsorption effect of π bonds is achieved, so that the rust inhibitor can be better adsorbed on the surface of the ball valve body. When a polar group is close to the π bond, a large π bond will be formed due to conjugation, thereby enhancing the adsorption effect. Using p-toluenesulfonic acid as a catalyst, the carbonyl-carrying isopentenyl mercaptan acetate is reacted with 1,6-hexamethylenediphosphonic acid to modify the introduction of a phosphine group that can improve the rust prevention performance, and then compounded with 1-hexadecanethiol to further improve the rust prevention and corrosion inhibition performance. DETAILED DESCRIPTION

[0034] The present application is described in further detail below.

[0035] In the present application, pyridine-3-carboxylic acid chloride, CAS No. 10400-19-8; n-butylamine thiocyanate, CAS No. 25162-84-9; p-formylbenzoic acid, CAS No. 619-66-9; 4-hexylbenzaldehyde, CAS No. 49763-69-1; 1-hexadecanethiol, CAS No. 2917-26-2; isopentenyl mercaptan acetate, CAS No. 33049-93-3; 1,6-hexamethylenediphosphonic acid, CAS No. 4721-22-6.

[0036] Unless otherwise specified, the raw materials used in the following embodiments can be obtained from common commercial sources.

[0037] Example

[0038] Example 1

[0039] The present embodiment discloses a steel ball valve, including a ball valve body, the surface of which is treated with a rust inhibitor comprising the following components: pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, p-formylbenzoic acid, 4-hexylbenzaldehyde, pyrrole, p-toluenesulfonic acid, propionic acid, anhydrous ethanol, polyethylene glycol and dichloromethane; the content of each component is shown in Table 1 below.

[0040] The treatment process of the ball valve body includes the following steps:

[0041] S1. Preparation of rust remover; pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, 0.8 parts of polyethylene glycol and dichloromethane were mixed, stirred at room temperature for 1 hour, filtered, and product A was obtained;

[0042] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 131°C, then add p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 1h after the addition is complete, stir and cool to 70°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0043] The product A, the product B, 1-hexadecanethiol and the remaining polyethylene glycol are blended to obtain a rust remover;

[0044] S2. Spraying of rust remover; spray the rust remover prepared in S1 onto the preheated ball valve body to be treated by a spray gun, with a spraying distance of 15 mm and a spraying pressure of 0.6 MPa. After spraying, dry at 100°C for 10 minutes.

[0045] Infrared spectrum test of product A: at 1710-1730cm -1 The characteristic absorption peak of acyl group appears at 1655-1679cm -1 The stretching vibration peak of N=C appears at 1050-1100cm -1 C=S stretching vibration peak appears in the range of 1210-1260cm -1 The CN stretching vibration peak appears in the range, indicating the formation of acyl isothiocyanate compounds.

[0046] Infrared spectrum test of product B: at 1965-1705cm -1 1050-1250cm -1 and 1350-1450cm -1 The stretching vibration peaks of C=O and CO of carboxyl and the bending vibration peak of -OH appear in the range of 800-1100cm -1 、2850-2900cm -1 、2920-2940cm -1 1400-1460cm -1 The characteristic peaks of CC, CH symmetric stretching vibration, CH asymmetric stretching vibration and CH bending vibration of the carbon chain appear in the range of 1600-1550cm -1 、1460-1410cm -1 、1330-1280cm -1 Stretching vibration peaks appeared in the range, corresponding to the stretching vibration of carbon-carbon double bond and single bond, carbon-nitrogen bond and carbon-carbon bond, and bending vibration of carbon-hydrogen bond in the porphyrin ring, indicating the formation of porphyrin compounds carrying carboxyl groups and long carbon chains.

[0047] Example 2

[0048] The present embodiment discloses a steel ball valve, including a ball valve body, the surface of which is treated with a rust inhibitor comprising the following components: pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, p-formylbenzoic acid, 4-hexylbenzaldehyde, pyrrole, p-toluenesulfonic acid, propionic acid, anhydrous ethanol, polyethylene glycol and dichloromethane; the content of each component is shown in Table 1 below.

[0049] The treatment process of the ball valve body includes the following steps:

[0050] S1. Preparation of rust remover; pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, 1 part of polyethylene glycol and dichloromethane were mixed, stirred at room temperature for 1.5h, filtered, and product A was obtained;

[0051] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 135°C, then add p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 2h after the addition is complete, stir and cool to 75°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0052] The product A, the product B, 1-hexadecanethiol and the remaining polyethylene glycol are blended to obtain a rust remover;

[0053] S2. Spraying of rust remover; spray the rust remover prepared in S1 onto the preheated ball valve body to be treated by a spray gun, with a spraying distance of 25 mm and a spraying pressure of 0.8 MPa. After spraying, dry at 120°C for 20 min.

[0054] Example 3

[0055] The present embodiment discloses a steel ball valve, including a ball valve body, the surface of which is treated with a rust inhibitor comprising the following components: pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, p-formylbenzoic acid, 4-hexylbenzaldehyde, pyrrole, p-toluenesulfonic acid, propionic acid, anhydrous ethanol, polyethylene glycol and dichloromethane; the content of each component is shown in Table 1 below.

[0056] The treatment process of the ball valve body includes the following steps:

[0057] S1. Preparation of rust remover; pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, 0.9 parts of polyethylene glycol and dichloromethane were mixed, stirred at room temperature for 1.2h, filtered, and product A was obtained;

[0058] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 133°C, then add p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 1.5h after the addition is complete, stir and cool to 72°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0059] The product A, the product B, 1-hexadecanethiol and the remaining polyethylene glycol are blended to obtain a rust remover;

[0060] S2. Spraying of rust remover; spray the rust remover prepared in S1 onto the preheated ball valve body to be treated by a spray gun, with a spraying distance of 20 mm and a spraying pressure of 0.7 MPa. After spraying, dry at 110°C for 15 min.

[0061] Example 4

[0062] The difference from Example 1 is that the components of the rust inhibitor further include 1-hexadecanethiol, isopentenyl mercaptan acetate, toluene and 1,6-hexamethylenediphosphonic acid.

[0063] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 131°C, then add 0.8 parts of p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 1 hour after the addition is complete, stir and cool to 70°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0064] The preparation step of the rust remover also includes: mixing isopentenyl mercaptan acetate, toluene, 1,6-hexamethylene diphosphonic acid and the remaining p-toluenesulfonic acid, stirring and reacting at 60° C. for 1 hour to obtain compound C;

[0065] blending product A, product B, 1-hexadecanethiol, compound C and remaining polyethylene glycol to obtain a rust remover;

[0066] Infrared spectrum test of compound C: at 1700-1725cm -1 The characteristic absorption peak of acyl group appears at 1100-1230cm -1 The asymmetric stretching vibration peak and symmetric stretching vibration peak of the phosphate group appear in the region; 1330-1350cm -1 The characteristic absorption peak corresponding to the phosphorus-oxygen bond appears, indicating that the reaction occurs.

[0067] Example 5

[0068] The difference from Example 2 is that the components of the rust inhibitor further include 1-hexadecanethiol, isopentenyl mercaptan acetate, toluene and 1,6-hexamethylenediphosphonic acid.

[0069] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 135°C, then add 1 portion of p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 2 hours after the addition is complete, stir and cool to 75°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0070] The preparation step of the rust remover also includes: mixing isopentenyl mercaptan acetate, toluene, 1,6-hexamethylene diphosphonic acid and the remaining p-toluenesulfonic acid, stirring and reacting at 70° C. for 1.5 hours to obtain compound C;

[0071] The product A, the product B, 1-hexadecanethiol, the compound C and the remaining polyethylene glycol are blended to obtain a rust remover.

[0072] Example 6

[0073] The difference from Example 3 is that the components of the rust inhibitor further include 1-hexadecanethiol, isopentenyl mercaptan acetate, toluene and 1,6-hexamethylenediphosphonic acid.

[0074] Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 133°C, then add 0.9 parts of p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 1.5h after the addition is complete, stir and cool to 72°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B;

[0075] The preparation step of the rust remover also includes: mixing isopentenyl mercaptan acetate, toluene, 1,6-hexamethylene diphosphonic acid and the remaining p-toluenesulfonic acid, stirring and reacting at 65° C. for 1.2 hours to obtain compound C;

[0076] The product A, the product B, 1-hexadecanethiol, the compound C and the remaining polyethylene glycol are blended to obtain a rust remover.

[0077] Example 7

[0078] The difference from Example 1 is that the rust inhibitor further comprises 5 parts of 1-hexadecanethiol.

[0079] Example 8

[0080] The difference from Example 7 is that 1-hexadecanethiol is replaced by dodecane.

[0081] Example 9

[0082] The difference from Example 7 is that the components of the rust inhibitor further include 3 parts of isopentenyl mercaptan acetate and 3 parts of toluene.

[0083] Example 10

[0084] The difference from Example 9 is that isopentenyl mercaptan acetate is replaced by isopropenyl acetate.

[0085] Embodiment 11

[0086] The difference from Example 4 is that 1,6-hexamethylenediphosphonic acid is replaced by hexanoic anhydride.

[0087] Example 12

[0088] The difference from Example 4 is that, by weight ratio, 1-hexadecanethiol: isopentenylthiol acetate: 1,6-hexamethylenediphosphonic acid = 3:2:1, i.e., 6 parts of 1-hexadecanethiol, 4 parts of isopentenylthiol acetate and 2 parts of 1,6-hexamethylenediphosphonic acid.

[0089] Comparative Example

[0090] Comparative Example 1

[0091] The difference from Example 1 is that the ball valve body is not treated with a rust inhibitor.

[0092] Comparative Example 2

[0093] The difference from Example 1 is that pyridine-3-carboxylic acid chloride is replaced by tridecanoyl chloride.

[0094] Comparative Example 3

[0095] The difference from Comparative Example 2 is that p-formylbenzoic acid is replaced by benzaldehyde.

[0096] Comparative Example 4

[0097] The difference from Comparative Example 2 is that 4-hexylbenzaldehyde is replaced by benzaldehyde.

[0098] Table 1 Component contents of Examples 1-6

[0099]

[0100]

[0101] Performance testing

[0102] (1) Rust prevention test: According to the processing technology of each embodiment and comparative example, a 50 mm × 50 mm × 30 mm sample with the same material as the ball valve was prepared; the sample was immersed in a NaCl aqueous solution with a solution concentration of 5% and a temperature of 50° C. The time t for rust spot generation was recorded as a representation of the rust prevention effect. The longer the time t for rust spot generation, the better the rust prevention effect. The test results are shown in Table 2 below.

[0103] Table 2 Performance test results of various embodiments and comparative examples

[0104]

[0105]

[0106] This specific implementation is merely an explanation of the present application and is not intended to limit the scope of protection of the present application. After reading this specification, those skilled in the art may make modifications to the present implementation as needed without any creative contribution, but as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A steel ball valve, comprising a ball valve body, characterized in that: The surface of the ball valve body is treated with a rust inhibitor comprising the following components in parts by weight: 30-35 parts of pyridine-3-carboxylic acid chloride; 20-25 parts of n-butylamine thiocyanate; 5-6 parts of p-formylbenzoic acid; 5-6 parts of 4-hexylbenzaldehyde; 10-12 parts of pyrrole; 1.6-2 parts p-toluenesulfonic acid; 50-60 parts of propionic acid; 15-20 parts of anhydrous ethanol; 5-6 parts of polyethylene glycol; 10-12 parts of dichloromethane.

2. A steel ball valve according to claim 1, characterized in that: The rust inhibitor further comprises 5-7 parts of 1-hexadecanethiol by weight.

3. A steel ball valve according to claim 2, characterized in that: The rust inhibitor further comprises 3-4 parts of isopentenyl mercaptan acetate and 3-4 parts of toluene by weight.

4. A steel ball valve according to claim 3, characterized in that: The rust inhibitor further comprises 2-3 parts by weight of 1,6-hexamethylene diphosphonic acid.

5. A steel ball valve according to claim 1, characterized in that: By weight ratio, 1-hexadecanethiol: isopentenylthiol acetate: 1,6-hexamethylenediphosphonic acid = 3:2:

1.

6. A steel ball valve according to claim 1, characterized in that: The processing process of the ball valve body comprises the following steps: S1. Preparation of rust remover; pyridine-3-carboxylic acid chloride, n-butylamine thiocyanate, 0.8-1 parts of polyethylene glycol and dichloromethane were mixed, stirred at room temperature for 1-1.5h, filtered, and product A was obtained; Add p-formylbenzoic acid and 4-hexylbenzaldehyde to a propionic acid solution at 131-135°C, then add p-toluenesulfonic acid, stir and heat to reflux; then add freshly distilled pyrrole dropwise, continue to reflux for 1-2h after the addition is complete, stir and cool to 70-75°C, add anhydrous ethanol, stir and cool to room temperature, and filter to obtain product B; The product A, the product B, 1-hexadecanethiol and the remaining polyethylene glycol are blended to obtain a rust remover; S2. Spraying of rust remover; spray the rust remover prepared in S1 onto the preheated ball valve body to be treated by a spray gun, with a spraying distance of 15-25mm and a spraying pressure of 0.6-0.8Mpa. After spraying, dry at 100-120°C for 10-20min.

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