Wear-resistant butterfly valve and machining method thereof

Abstract

The invention relates to a wear-resistant butterfly valve which comprises a butterfly valve main body, and the surface of the butterfly valve main body is treated by a surface treating agent comprising the following components: polyamide, 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitrovinylamine, p-aminophenylacetic acid, NaBH4, tetrahydrofuran, p-toluenesulfonic acid, absolute ethyl alcohol and dimethylformamide. The machining method of the wear-resistant butterfly valve comprises the steps of surface treating agent preparation and spraying. The preparation method comprises the following steps: carrying out carbon-carbon double bond addition on 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitrovinylamine to form a new covalent bond, reducing nitryl in a reaction product into amino, and crosslinking with p-aminophenylacetic acid to form the organic boron compound which has a three-dimensional network structure and carries an amide group. And the organic boron surface layer with high wear resistance is formed through cooperation with polyamide, so that the wear resistance of the butterfly valve main body is improved.

Description

Technical Field

[0001] The present application relates to the technical field of butterfly valves, and in particular to a wear-resistant butterfly valve and a processing method thereof. Background Art

[0002] The existing butterfly valve generally includes a valve body, a valve plate, and a valve stem. A valve seat is arranged in the valve body. The valve seat can be made of a rigid material or a flexible material. The valve plate is composed of a valve core and a rod sleeve. The valve core can be in sealing contact with the valve seat. The valve stem is inserted into the rod sleeve. When the valve stem rotates, the valve plate rotates with it, so that the valve core is in sealing contact with the valve seat or the valve seat is out of contact, thereby realizing the opening or closing of the butterfly valve. When the butterfly valve is opened or closed, friction will be generated between the valve core and the valve seat. As the use time increases, the friction point is prone to wear and affects the use of the butterfly valve. Therefore, there is still room for improvement. Summary of the invention

[0003] In order to improve the wear resistance of a butterfly valve and extend the service life of the butterfly valve, the present application provides a wear-resistant butterfly valve and a processing method thereof.

[0004] In the first aspect, the present application provides a wear-resistant butterfly valve adopting the following technical solution:

[0005] A wear-resistant butterfly valve comprises a butterfly valve body, the surface of which is treated with a surface treatment agent comprising the following components in parts by weight:

[0006] 25-30 parts of polyamide;

[0007] 10-12 parts of 6-hydroxypyridine-3-boric acid;

[0008] 6-8 parts of N-benzyl-2-nitroethyleneamine;

[0009] 3-4 parts of p-aminophenylacetic acid;

[0010] 0.6-0.8 parts NaBH4;

[0011] 1-1.2 parts of tetrahydrofuran;

[0012] 0.8-1 part of p-toluenesulfonic acid;

[0013] 15-20 parts of anhydrous ethanol;

[0014] 20-25 parts of dimethylformamide.

[0015] By adopting the above technical scheme, a new covalent bond is formed by addition of the carbon-carbon double bond of 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitroethyleneamine, and then the nitro group in the reaction product of 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitroethyleneamine is reduced to an amino group, and p-aminophenylacetic acid having a carboxyl group is further added to cross-link with it to form an organic boron compound carrying an amide group having a three-dimensional network structure, thereby forming an organic boron surface layer with high wear resistance. By synergizing with polyamide, a surface layer with high wear resistance is formed, thereby improving the wear resistance of the butterfly valve body and extending the service life of the butterfly valve.

[0016] Preferably, the surface treatment agent further comprises, by weight, 3-4 parts of 1-phenylbutane-2,3-diene-1-one, 5-6 parts of acetone and 0.4-0.5 parts of triethylamine.

[0017] By adopting the above technical scheme, the amide compound generated by the reaction product of 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitroethyleneamine with p-aminophenylacetic acid reacts with the double bond of 2-nitrostyrene to form a new carbon chain. At the same time, the obtained product has a benzene ring, has greater steric hindrance, and has a more stable structure, which helps to improve the wear resistance of the butterfly valve body.

[0018] Preferably, the surface treatment agent further comprises 5-7 parts of lithium dodecyl stearate and 12-15 parts of methanol by weight.

[0019] By adopting the above technical solution, lithium dodecyl hydroxystearate with low friction is introduced to improve lubricity, reduce friction coefficient, reduce direct contact between abrasive particles and the surface of the coating, and reduce wear.

[0020] Preferably, the surface treatment agent further comprises 2-4 parts of nano-aluminum oxide and 2-3 parts of nano-molybdenum disulfide by weight.

[0021] By adopting the above technical scheme, nano phase is further added to the organic boron surface layer, and nano alumina and nano molybdenum disulfide with anti-friction and lubrication properties are compounded, and lithium dodecahydroxystearate is used to assist in achieving uniform dispersion of nano particles. On the one hand, hardness is enhanced and micropores are filled, and on the other hand, uniform dispersion is achieved, which is beneficial to reduce surface defects of the butterfly valve body, improve the density of the surface layer, and enhance the wear resistance of the butterfly valve body.

[0022] Preferably, in terms of weight ratio, nano-aluminum oxide: nano-molybdenum disulfide = 8:5.

[0023] In a second aspect, the present application provides a method for processing a wear-resistant butterfly valve, which adopts the following technical solution:

[0024] A method for processing a wear-resistant butterfly valve comprises the following steps:

[0025] S1. Preparation of surface treatment agent: 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine and 10-12 parts of anhydrous ethanol are mixed, and then 0.5-0.6 parts of p-toluenesulfonic acid are added, and the mixture is stirred at 50-60°C for 1-2 hours; the mixture is cooled to 0-5°C, and a NaBH4 solution pre-dissolved in tetrahydrofuran is added dropwise under a nitrogen atmosphere while stirring. After the reaction is completed, water is added to quench the reaction, and then the mixture is neutralized to neutrality with 15% dilute hydrochloric acid, and filtered and extracted to obtain product A;

[0026] The product A, p-aminophenylacetic acid and the remaining anhydrous ethanol are mixed, and the remaining p-toluenesulfonic acid is added, and the mixture is stirred at 50-60° C. for 1-2 hours to obtain the product B; finally, polyamide and dimethylformamide are added and mixed to obtain a surface treatment agent;

[0027] S2. Spray the surface treatment agent; spray the surface treatment agent prepared in S1 on the surface of the butterfly valve body with a spray gun, the spraying distance is 15-16cm, the spray gun pressure is 1.2-1.6MPa; dry at 80-100℃ for 25-30min.

[0028] Preferably, product B is mixed with 3-4 parts of 1-phenylbutane-2,3-diene-1-one, 5-6 parts of acetone and 0.4-0.5 parts of triethylamine, and stirred at 45-50° C. for 1-2 hours to obtain product C;

[0029] Dissolve 5-7 parts of lithium dodecyl stearate in 12-15 parts of methanol, add 2-4 parts of nano-alumina and 2-3 parts of nano-molybdenum disulfide, and perform ultrasonic treatment at 100-200 W power and 50-60 KHz frequency for 4-5 minutes to obtain a mixture D;

[0030] The product C, the mixture D, the polyamide and the dimethylformamide are mixed to obtain a surface treating agent.

[0031] In summary, this application includes the following beneficial technical effects:

[0032] 1. A new covalent bond is formed by addition of the carbon-carbon double bond of 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitroethyleneamine, and then the nitro group in the reaction product of 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitroethyleneamine is reduced to an amino group, and p-aminophenylacetic acid having a carboxyl group is further added to cross-link with it to form an organic boron compound carrying an amide group having a three-dimensional network structure, thereby forming an organic boron surface layer with high wear resistance. Through synergy with polyamide, a surface layer with high wear resistance is formed, thereby improving the wear resistance of the butterfly valve body and extending the service life of the butterfly valve;

[0033] 2. The amide compound generated by the reaction product of 6-hydroxypyridine-3-boric acid and N-benzyl-2-nitroethyleneamine with p-aminophenylacetic acid reacts with the double bond of 2-nitrostyrene to form a new carbon chain. The obtained product has a benzene ring, greater steric hindrance, and a more stable structure, which helps to improve the wear resistance of the butterfly valve body;

[0034] 3. Introduce low-friction lithium dodecahydroxystearate to improve lubricity, reduce friction coefficient and reduce direct contact between abrasive particles and coating surface, thus alleviating wear; further add nano phase to the organic boron surface layer, compound nano alumina and nano molybdenum disulfide with anti-friction and lubricating properties, and lithium dodecahydroxystearate assists in achieving uniform dispersion of nano particles, which, on the one hand, enhances hardness and fills micropores, and on the other hand, achieves uniform dispersion, which is beneficial to reduce surface defects of the butterfly valve body, improve the density of the surface layer, and enhance the wear resistance of the butterfly valve body. DETAILED DESCRIPTION

[0035] The present application is described in further detail below.

[0036] In the present application, polyamide is provided by Kaiming Plastic (Dongguan) Co., Ltd., with a mesh size of 200; 6-hydroxypyridine-3-boric acid, CAS No. 903899-13-8; N-benzyl-2-nitroethyleneamine, CAS No. 102804-20-6; p-aminophenylacetic acid, CAS No.; 1-phenylbutane-2,3-diene-1-one, CAS No. 69626-39-7; lithium dodecanoate, CAS No. 7620-77-1, is provided by Wuhan Jixin Yibang Biotechnology Co., Ltd.; nano-alumina is provided by Hangzhou Jikang New Materials Co., Ltd., with a particle size of 100-150nm, model SS-LA150; nano-molybdenum disulfide is provided by Guangzhou Hongwu Materials Technology Co., Ltd., with a particle size of 100-200nm.

[0037] Unless otherwise specified, the raw materials used in the following embodiments can be obtained from common commercial sources.

[0038] Example

[0039] Example 1

[0040] The present embodiment discloses a wear-resistant butterfly valve and a processing method thereof; a wear-resistant butterfly valve, comprising a butterfly valve body, the surface of which is treated with a surface treatment agent comprising the following components: polyamide, 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine, p-aminophenylacetic acid, NaBH4, tetrahydrofuran, p-toluenesulfonic acid, anhydrous ethanol and dimethylformamide, and the content of each component is shown in Table 1 below.

[0041] A method for processing a wear-resistant butterfly valve comprises the following steps:

[0042] S1. Preparation of surface treatment agent: 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine and 10 parts of anhydrous ethanol were mixed, and then 0.5 parts of p-toluenesulfonic acid were added, and the mixture was stirred at 50°C for 1 hour; the mixture was cooled to 0°C, and a NaBH4 solution pre-dissolved in tetrahydrofuran was added dropwise under a nitrogen atmosphere while stirring. After the reaction was completed, water was added to quench the reaction, and then the mixture was neutralized to neutral with 15% dilute hydrochloric acid, and filtered to obtain product A;

[0043] The product A, p-aminophenylacetic acid and the remaining anhydrous ethanol are mixed, and the remaining p-toluenesulfonic acid is added, and the mixture is stirred at 50° C. for 1 hour to obtain the product B; finally, polyamide and dimethylformamide are added and mixed to obtain a surface treatment agent;

[0044] S2. Spray the surface treatment agent; spray the surface treatment agent prepared in S1 on the surface of the butterfly valve body with a spray gun, the spraying distance is 15 cm, and the spray gun pressure is 1.2 MPa; dry at 80°C for 25 minutes.

[0045] Infrared spectrum test of product A: at 3340-3460cm -1 The NH stretching vibration peak appears at 1680-1720, and the NH bending vibration peak appears at 1680-1720, which are the characteristic absorption peaks of the amino group, and there is no characteristic absorption peak of the carbon-carbon double bond, indicating the occurrence of the reaction.

[0046] Infrared spectrum test of product B: at 1650-1690cm -1 The C=O stretching vibration peak appears at 3190-3400cm -1 The NH stretching vibration peak appears at 1280-1340cm -1 The appearance of CN stretching vibration peak, the characteristic absorption peak of amide group, indicates the occurrence of reaction.

[0047] Example 2

[0048] The present embodiment discloses a wear-resistant butterfly valve and a processing method thereof; a wear-resistant butterfly valve, comprising a butterfly valve body, the surface of which is treated with a surface treatment agent comprising the following components: polyamide, 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine, p-aminophenylacetic acid, NaBH4, tetrahydrofuran, p-toluenesulfonic acid, anhydrous ethanol and dimethylformamide, and the content of each component is shown in Table 1 below.

[0049] A method for processing a wear-resistant butterfly valve comprises the following steps:

[0050] S1. Preparation of surface treatment agent: 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine and 12 parts of anhydrous ethanol were mixed, and then 0.6 parts of p-toluenesulfonic acid were added, and the mixture was stirred at 60°C for 2 hours; the mixture was cooled to 5°C, and a NaBH4 solution pre-dissolved in tetrahydrofuran was added dropwise under a nitrogen atmosphere while stirring. After the reaction was completed, water was added to quench the reaction, and then the mixture was neutralized to neutral with 15% dilute hydrochloric acid, and filtered and extracted to obtain product A;

[0051] The product A, p-aminophenylacetic acid and the remaining anhydrous ethanol are mixed, and the remaining p-toluenesulfonic acid is added, and the mixture is stirred at 60° C. for 2 hours to obtain the product B; finally, polyamide and dimethylformamide are added and mixed to obtain a surface treatment agent;

[0052] S2. Spray the surface treatment agent; spray the surface treatment agent prepared in S1 on the surface of the butterfly valve body with a spray gun, the spraying distance is 16 cm, and the spray gun pressure is 1.6 MPa; dry at 100°C for 30 minutes.

[0053] Example 3

[0054] The present embodiment discloses a wear-resistant butterfly valve and a processing method thereof; a wear-resistant butterfly valve, comprising a butterfly valve body, the surface of which is treated with a surface treatment agent comprising the following components: polyamide, 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine, p-aminophenylacetic acid, NaBH4, tetrahydrofuran, p-toluenesulfonic acid, anhydrous ethanol and dimethylformamide, and the content of each component is shown in Table 1 below.

[0055] A method for processing a wear-resistant butterfly valve comprises the following steps:

[0056] S1. Preparation of surface treatment agent: 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine and 11 parts of anhydrous ethanol were mixed, and then 0.5 parts of p-toluenesulfonic acid were added, and the mixture was stirred at 55°C for 1.5 hours; the mixture was cooled to 3°C, and a NaBH4 solution pre-dissolved in tetrahydrofuran was added dropwise under a nitrogen atmosphere while stirring. After the reaction was completed, water was added to quench the reaction, and then the mixture was neutralized to neutrality with 15% dilute hydrochloric acid, and filtered and extracted to obtain product A;

[0057] The product A, p-aminophenylacetic acid and the remaining anhydrous ethanol were mixed, and the remaining p-toluenesulfonic acid was added, and the mixture was stirred at 55°C for 1.5 hours to obtain the product B; finally, polyamide and dimethylformamide were added and mixed to obtain the surface treatment agent;

[0058] S2. Spray the surface treatment agent; spray the surface treatment agent prepared in S1 on the surface of the butterfly valve body with a spray gun, the spraying distance is 16 cm, and the spray gun pressure is 1.4 MPa; dry at 90°C for 28 minutes.

[0059] Example 4

[0060] The difference from Example 1 is that the components of the surface treatment agent further include 1-phenylbutane-2,3-diene-1-one, acetone, triethylamine, lithium dodecyl stearate and methanol, nano-aluminum oxide and nano-molybdenum disulfide.

[0061] A method for processing a wear-resistant butterfly valve also includes the following steps:

[0062] The product B was mixed with 1-phenylbutane-2,3-diene-1-one, acetone and triethylamine, and stirred at 45°C for 1 hour to obtain the product C;

[0063] Dissolve lithium dodecanoate in methanol, add nano-alumina and nano-molybdenum disulfide, and perform ultrasonic treatment at 100 W power and 50 KHz frequency for 4 min to obtain a mixture D;

[0064] The product C, the mixture D, the polyamide and the dimethylformamide are mixed to obtain a surface treating agent.

[0065] The infrared spectrum of product C was tested at 1620-1680cm -1 No characteristic absorption peak of the carbon-carbon double bond was observed, proving that the carbon-carbon double bond had undergone addition reaction.

[0066] Example 5

[0067] The difference from Example 2 is that the components of the surface treatment agent also include 1-phenylbutane-2,3-diene-1-one, acetone, triethylamine, lithium dodecyl stearate and methanol, nano-aluminum oxide and nano-molybdenum disulfide.

[0068] A method for processing a wear-resistant butterfly valve also includes the following steps:

[0069] The product B was mixed with 1-phenylbutane-2,3-diene-1-one, acetone and triethylamine, and stirred at 50°C for 2h to obtain the product C;

[0070] Dissolve lithium dodecanoate in methanol, add nano-alumina and nano-molybdenum disulfide, and perform ultrasonic treatment at 200W power and 60KHz frequency for 5 minutes to obtain a mixture D;

[0071] The product C, the mixture D, the polyamide and the dimethylformamide are mixed to obtain a surface treating agent.

[0072] Example 6

[0073] The difference from Example 3 is that the components of the surface treatment agent further include 1-phenylbutane-2,3-diene-1-one, acetone, triethylamine, lithium dodecyl stearate and methanol, nano-aluminum oxide and nano-molybdenum disulfide.

[0074] A method for processing a wear-resistant butterfly valve also includes the following steps:

[0075] The product B was mixed with 1-phenylbutane-2,3-diene-1-one, acetone and triethylamine, and stirred at 48°C for 1.5 hours to obtain the product C;

[0076] Dissolve lithium dodecanoate in methanol, add nano-alumina and nano-molybdenum disulfide, and perform ultrasonic treatment at 150W power and 55KHz frequency for 5 minutes to obtain a mixture D;

[0077] The product C, the mixture D, the polyamide and the dimethylformamide are mixed to obtain a surface treating agent.

[0078] Example 7

[0079] The difference from Example 1 is that the components of the surface treatment agent further include 3 parts of 1-phenylbutane-2,3-dien-1-one, 5 parts of acetone and 0.4 parts of triethylamine.

[0080] Example 8

[0081] The difference from Example 7 is that 1-phenylbutane-2,3-diene-1-one is replaced by styrene. The contents of each component are shown in Table 2 below.

[0082] Example 9

[0083] The difference from Example 4 is that, by weight ratio, nano-aluminum oxide: nano-molybdenum disulfide = 8:5, that is, 4 parts of nano-aluminum oxide and 2.5 parts of nano-molybdenum disulfide.

[0084] Example 10

[0085] The difference from Example 4 is that nano-molybdenum disulfide is replaced by nano-calcium oxide, and the content of each component is shown in Table 2 below.

[0086] Comparative Example

[0087] Comparative Example 1

[0088] The difference from Example 1 is that the butterfly valve body is not treated with a surface treatment agent.

[0089] Comparative Example 2

[0090] The difference from Example 1 is that 6-hydroxypyridine-3-boric acid is replaced by phenylboric acid.

[0091] Comparative Example 3

[0092] The difference from Comparative Example 2 is that N-benzyl-2-nitroethyleneamine is replaced by styrene.

[0093] Comparative Example 4

[0094] The difference from Comparative Example 3 is that p-aminophenylacetic acid is replaced by 4-ethylphenylacetic acid.

[0095] Table 1 Component contents of Examples 1-6

[0096]

[0097]

[0098] Performance testing

[0099] Test method: Each embodiment and comparative example was made into a 50mm×30mm×30mm specimen, and the wear rate was used to characterize the wear resistance; the wear rate was tested using a universal friction and wear testing machine, and the test conditions were: test force 50N, rotation speed 250r / min, test time 30min, and wear rate calculation formula: wear rate = (mass before friction-mass after friction) / mass before friction × 100%; the greater the wear rate, the worse the wear resistance; the test results are shown in Table 2 below.

[0100] Table 2 Performance test results of various embodiments and comparative examples

[0101] Wear rate / % Example 1 0.52 Example 2 0.45 Example 3 0.48 Example 4 0.42 Example 5 0.35 Example 6 0.38 Example 7 0.49 Example 8 0.52 Example 9 0.40 Example 10 0.40 Comparative Example 1 1.94 Comparative Example 2 0.59 Comparative Example 3 0.65 Comparative Example 4 0.68

[0102] 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 wear-resistant butterfly valve, comprising a butterfly valve body, characterized in that: The surface of the butterfly valve body is treated with a surface treatment agent comprising the following components in parts by weight: 25-30 parts of polyamide; 10-12 parts of 6-hydroxypyridine-3-boric acid; 6-8 parts of N-benzyl-2-nitroethyleneamine; 3-4 parts of p-aminophenylacetic acid; 0.6-0.8 parts NaBH4; 1-1.2 parts of tetrahydrofuran; 0.8-1 part of p-toluenesulfonic acid; 15-20 parts of anhydrous ethanol; 20-25 parts of dimethylformamide.

2. The wear-resistant butterfly valve according to claim 1, characterized in that: The surface treatment agent further comprises, by weight, 3-4 parts of 1-phenylbutane-2,3-diene-1-one, 5-6 parts of acetone and 0.4-0.5 parts of triethylamine.

3. The wear-resistant butterfly valve according to claim 1, characterized in that: The surface treatment agent further comprises 5-7 parts of lithium dodecyl stearate and 12-15 parts of methanol by weight.

4. The wear-resistant butterfly valve according to claim 3, characterized in that: In terms of weight, the surface treatment agent also includes 2-4 parts of nano-aluminum oxide and 2-3 parts of nano-molybdenum disulfide.

5. The wear-resistant butterfly valve according to claim 4, characterized in that: By weight ratio, nano-alumina: nano-molybdenum disulfide = 8:

5.

6. The method for processing a wear-resistant butterfly valve according to claim 1, characterized in that: The steps include: S1. Preparation of surface treatment agent: 6-hydroxypyridine-3-boric acid, N-benzyl-2-nitroethyleneamine and 10-12 parts of anhydrous ethanol are mixed, and then 0.5-0.6 parts of p-toluenesulfonic acid are added, and the mixture is stirred at 50-60°C for 1-2 hours; the mixture is cooled to 0-5°C, and a NaBH4 solution pre-dissolved in tetrahydrofuran is added dropwise under a nitrogen atmosphere while stirring. After the reaction is completed, water is added to quench the reaction, and then the mixture is neutralized to neutrality with 15% dilute hydrochloric acid, and filtered and extracted to obtain product A; The product A, p-aminophenylacetic acid and the remaining anhydrous ethanol are mixed, and the remaining p-toluenesulfonic acid is added, and the mixture is stirred at 50-60° C. for 1-2 hours to obtain the product B; finally, polyamide and dimethylformamide are added and mixed to obtain a surface treatment agent; S2. Spray the surface treatment agent; spray the surface treatment agent prepared in S1 on the surface of the butterfly valve body with a spray gun, the spraying distance is 15-16cm, the spray gun pressure is 1.2-1.6MPa; dry at 80-100℃ for 25-30min.

7. A method for processing a wear-resistant butterfly valve according to claim 6, characterized in that: The method further comprises the following steps: mixing the product B with 3-4 parts of 1-phenylbutane-2,3-diene-1-one, 5-6 parts of acetone and 0.4-0.5 parts of triethylamine, and stirring the mixture at 45-50° C. for 1-2 hours to obtain the product C; Dissolve 5-7 parts of lithium dodecyl stearate in 12-15 parts of methanol, add 2-4 parts of nano-alumina and 2-3 parts of nano-molybdenum disulfide, and perform ultrasonic treatment at 100-200 W power and 50-60 KHz frequency for 4-5 minutes to obtain a mixture D; The product C, the mixture D, the polyamide and the dimethylformamide are mixed to obtain a surface treating agent.

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