A high temperature resistant butterfly valve and its production process

Abstract

The present application relates to a high temperature resistant butterfly valve, including a butterfly valve body, the surface of the butterfly valve body is coated with a thermal insulation coating, the thermal insulation coating includes: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazine, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, penetrant, polyvinyl acetate emulsion, DMF and water; a production process of a high temperature resistant butterfly valve, including the preparation, pretreatment and coating of the thermal insulation coating. The present application has the following advantages and effects: ceramic fiber and talcum powder can prevent heat conduction; the ammonium radical of dodecyltrimethylammonium chloride and the carboxylate radical in sodium alginate form a hydrogel with a three-dimensional network through ionic interaction; 1-hydroxybenzotriazole is used as an activator, and the carboxyl bonding of valeryl dihydrazine and sodium alginate is modified under the action of the condensation agent dicyclohexylcarbodiimide to form a stable entangled three-dimensional network, which effectively ensures the thermal insulation performance of the coating.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a high temperature resistant butterfly valve and a production process thereof. Background Art

[0002] The butterfly valve is a relatively simple regulating valve, which is usually used to cut off or throttle various types of fluids such as water, various corrosive media, mud, oil, liquid metal, etc. in pipelines.

[0003] The existing Chinese patent with publication number CN107035873A discloses a butterfly valve, including a hollow valve body, a valve shaft vertically penetrating the valve body, and a valve plate sleeved outside the valve shaft. The valve plate realizes opening and closing actions with the valve body under the drive of the valve shaft. A ceramic gasket is provided on the inner side surface of the valve body along the circumference direction of the valve body, a ceramic sealing plate is provided on the outer peripheral side of the valve plate along the circumference direction of the valve plate, a groove is provided on the ceramic sealing plate along the circumference direction of the ceramic sealing plate, and a polytetrafluoroethylene gasket is provided in the groove.

[0004] With respect to the above-mentioned related technologies, the inventors believe that with the current application of butterfly valves in the field of high temperature resistance, requirements are also put forward for the high temperature resistance performance of butterfly valves, so the existing butterfly valves still need to be improved. Summary of the invention

[0005] In order to improve the high temperature resistance of a butterfly valve, the present application provides a high temperature resistant butterfly valve and a production process thereof.

[0006] In the first aspect, the present application provides a high temperature resistant butterfly valve adopting the following technical solution:

[0007] A high temperature resistant butterfly valve comprises a butterfly valve body, the surface of the butterfly valve body is coated with a heat insulating coating, and the heat insulating coating comprises the following components in parts by weight:

[0008] 15-18 parts of methylphenyl silicone resin;

[0009] 8-9 parts of sodium alginate;

[0010] 1-2 parts of dodecyltrimethylammonium chloride;

[0011] 4-5 parts of valeryl dihydrazide;

[0012] 1-2 parts of dicyclohexylcarbodiimide;

[0013] 1-2 parts of 1-hydroxybenzotriazole;

[0014] 2-3 parts of ceramic fiber;

[0015] 1-2 parts talcum powder;

[0016] 0.5-1 part of penetrant;

[0017] 6-7 parts of polyvinyl acetate emulsion;

[0018] 10-12 parts of DMF;

[0019] 20-30 parts water.

[0020] By adopting the above technical scheme, hollow spheres of ceramic fibers and talcum powder of different particle sizes form a tightly packed structure, forming a vacuum wall like countless vacuum cavities, which effectively prevents heat conduction; the sodium alginate structure contains a large number of functional groups such as carboxyl and hydroxyl groups, and the ammonium ions of dodecyltrimethylammonium chloride and the carboxylate ions in sodium alginate form a hydrogel with a three-dimensional network through ionic interactions; further, valeryl dihydrazide and 1-hydroxybenzotriazole are added as activators, and the condensation agent dicyclohexylcarbodiimide is used to modify the sodium alginate through chemical bonding between hydrazine groups and active carboxyl groups, thereby improving the stability of the three-dimensional cross-linked structure and forming a stably entangled three-dimensional network, which effectively ensures the thermal insulation performance of the coating.

[0021] Preferably, in terms of weight ratio, the sodium alginate: dodecyltrimethylammonium chloride: valeryl dihydrazide = 8:1:5.

[0022] Preferably, by weight, the thermal insulation coating further comprises 0.6-0.8 parts of 2-methoxybutenoic acid and 0.1-0.2 parts of DMAP.

[0023] By adopting the above technical scheme, under the action of the catalyst DMAP, 2-methoxybutenoic acid can undergo an esterification cross-linking reaction with the hydroxyl groups in the sodium alginate, thereby modifying the sodium alginate, improving the high temperature resistance and adhesion of the thermal insulation coating, and making the thermal insulation coating easier to apply to the butterfly valve body.

[0024] Preferably, the thermal insulation coating further comprises 0.8-1 parts by weight of 2-methyl-3-nitrotrifluorotoluene.

[0025] Preferably, the thermal insulation coating further comprises 2-3 parts of 4-amino-1,2,4-triazole and 3-4 parts of sodium methoxide, by weight.

[0026] By adopting the above technical scheme, an amino group is introduced into the aromatic ring of 2-methyl-3-nitrotrifluorotoluene through the reaction of 4-amino-1,2,4-triazole and 2-methyl-3-nitrotrifluorotoluene. The amino group forms an intramolecular hydrogen bond with the adjacent nitro group, shortens the molecular distance, and makes the molecules more densely stacked, thereby improving the performance of fluorine compounds in thermal insulation coatings and enhancing high temperature resistance.

[0027] Preferably, the penetrant is penetrant T.

[0028] In a second aspect, the present application provides a production process for a high temperature resistant butterfly valve, which adopts the following technical solution:

[0029] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0030] S1. Preparation of thermal insulation coating; Sodium alginate, dodecyltrimethylammonium chloride and DMF are mixed, stirred at 400-500r / min for 4-6min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole are added, and stirred at 1000-1200r / min for 30-40min at 70-80°C; finally, methylphenyl silicone resin, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water are added, and stirred at 300-400r / min for 15-20min;

[0031] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0032] S3. Applying thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 7-8 mm and dry at 20-24°C.

[0033] Preferably, the method further comprises the following steps:

[0034] 0.8-1 parts of 2-methyl-3-nitrotrifluorotoluene, 2-3 parts of 4-amino-1,2,4-triazole and 5-6 parts of DMF are placed in a microwave reactor, and a suspension mixed with 3-4 parts of sodium methoxide and 7-8 parts of DMF is added, and microwave heating is performed at 75-85° C. for 6-8 minutes; the mixture is then filtered and dried, dissolved in acetone, and separated by column chromatography using a chromatography solution having a volume ratio of ethyl acetate to petroleum ether of 1:5 to obtain a 2-methyl-3-nitrotrifluorotoluene amination product;

[0035] In S1, after stirring at a speed of 1000-1200 r / min for 30-40 min, continue to add 0.6-0.8 parts of 2-methoxybutenoic acid and 0.1-0.2 parts of DMAP, maintain 70-80°C, and stir at a speed of 700-800 r / min for 30-40 min; finally, add methylphenyl silicone resin, 2-methyl-3-nitrotrifluorotoluene amination product, ceramic fiber, talcum powder, penetrant, polyvinyl acetate emulsion and water, and stir at a speed of 300-400 r / min for 15-20 min.

[0036] In summary, this application includes the following beneficial technical effects:

[0037] 1. The hollow spheres of ceramic fiber and talcum powder with different particle sizes form a tightly packed structure, forming a vacuum wall like countless vacuum cavities, which effectively prevents heat conduction; the sodium alginate structure contains a large number of functional groups such as carboxyl and hydroxyl groups, and the ammonium ions of dodecyltrimethylammonium chloride and the carboxylate ions in sodium alginate form a hydrogel with a three-dimensional network through ion interaction; further adding valeryl dihydrazide and 1-hydroxybenzotriazole as activators, the condensation agent dicyclohexylcarbodiimide is used to modify the hydrazine group and the active carboxyl group of sodium alginate through chemical bonding, thereby improving the stability of the three-dimensional cross-linked structure and forming a stable entangled three-dimensional network, which effectively ensures the thermal insulation performance of the coating;

[0038] 2. Under the action of the catalyst DMAP, 2-methoxybutenoic acid can undergo an esterification cross-linking reaction with the hydroxyl groups in sodium alginate, which can modify the sodium alginate, improve the high temperature resistance and adhesion of the thermal insulation coating, and make it easier to apply the thermal insulation coating on the butterfly valve body;

[0039] 3. By the reaction of 4-amino-1,2,4-triazole and 2-methyl-3-nitrobenzotrifluoride, an amino group is introduced into the aromatic ring of 2-methyl-3-nitrobenzotrifluoride. The amino group forms an intramolecular hydrogen bond with the adjacent nitro group, shortening the molecular distance and making the molecules more densely stacked, which can improve the performance of fluorine compounds in thermal insulation coatings and enhance high temperature resistance. DETAILED DESCRIPTION

[0040] The present application is described in further detail below.

[0041] In the present application, the methylphenyl silicone resin is methylphenyl silicone resin 6156C provided by Anhui Aiyota Silicone Oil Co., Ltd.; sodium alginate is provided by Jiangsu Rongchuang Bioengineering Co., Ltd., item number AL-5917133; the ceramic fiber is QF ceramic fiber provided by Zhoukou Qifeng Mineral Fiber Co., Ltd.; the talc powder is 1250 mesh talc powder provided by Chuzhou Pagoda Sericite Mining Co., Ltd.; and the polyvinyl acetate emulsion is provided by Taizhou Midebang Adhesive Materials Co., Ltd.

[0042] Unless otherwise specified, the raw materials used in the following embodiments can be obtained from common commercial sources.

[0043] Taking Example 1 as an example, 8 parts of sodium alginate, 1 part of dodecyltrimethylammonium chloride and 10 parts of DMF were mixed and stirred at 400 r / min for 4 min, then 4 parts of valeryl dihydrazide, 1 part of dicyclohexylcarbodiimide and 1 part of 1-hydroxybenzotriazole were added, and stirred at 1000 r / min for 30 min at 70°C. The product was characterized by infrared spectroscopy. At 3295 cm -1 The NH stretching vibration peak of the amide group is shown at 1645 cm -1The stretching vibration absorption peak of the amide group C=O is shown at 1535 cm -1 The bending absorption peak of amide NH is shown at

[0044] On the basis of the above, 0.6 parts of 2-methoxybutenoic acid and 0.1 parts of DMAP were added, the temperature was maintained at 70°C, and the stirring speed was 700 r / min for 30 min. The product was characterized by infrared spectroscopy. At 1739 cm -1 The stretching vibration absorption peak of the ester group C=O is shown at .

[0045] Example

[0046] Example 1

[0047] The present embodiment discloses a high temperature resistant butterfly valve and a production process thereof; a high temperature resistant butterfly valve, comprising a butterfly valve body, the surface of which is coated with a thermal insulation coating, the thermal insulation coating comprising the following components: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazide, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, a penetrant, polyvinyl acetate emulsion, DMF and water; the penetrant is a penetrant T, and the contents of each component are shown in Table 1 below.

[0048] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0049] S1. Preparation of thermal insulation coating; Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 400 r / min for 4 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, and stirred at 1000 r / min for 30 min at 70°C; finally, methylphenyl silicone resin, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water were added, and stirred at 300 r / min for 15 min;

[0050] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0051] S3. Applying thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 7 mm and dry at 20°C.

[0052] Example 2

[0053] The present embodiment discloses a high temperature resistant butterfly valve and a production process thereof; a high temperature resistant butterfly valve, comprising a butterfly valve body, the surface of which is coated with a thermal insulation coating, the thermal insulation coating comprising the following components: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazide, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, a penetrant, polyvinyl acetate emulsion, DMF and water; the penetrant is a penetrant T, and the contents of each component are shown in Table 1 below.

[0054] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0055] S1. Preparation of thermal insulation coating; Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 500 r / min for 6 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, and stirred at 1200 r / min for 40 min at 80°C; finally, methylphenyl silicone resin, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water were added, and stirred at 400 r / min for 20 min;

[0056] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0057] S3. Application of thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 8 mm and dry at 24°C.

[0058] Example 3

[0059] The present embodiment discloses a high temperature resistant butterfly valve and a production process thereof; a high temperature resistant butterfly valve, comprising a butterfly valve body, the surface of which is coated with a thermal insulation coating, the thermal insulation coating comprising the following components: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazide, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, a penetrant, polyvinyl acetate emulsion, DMF and water; the penetrant is a penetrant T, and the contents of each component are shown in Table 1 below.

[0060] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0061] S1. Preparation of thermal insulation coating; Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 450 r / min for 5 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, and stirred at 1100 r / min for 35 min at 75°C; finally, methylphenyl silicone resin, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water were added, and stirred at 350 r / min for 18 min;

[0062] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0063] S3. Applying thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 8 mm and dry at 22°C.

[0064] Example 4

[0065] The present embodiment discloses a high temperature resistant butterfly valve and a production process thereof; a high temperature resistant butterfly valve, comprising a butterfly valve body, the surface of the butterfly valve body being coated with a thermal insulation coating, the thermal insulation coating comprising the following components: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazide, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, penetrant, polyvinyl acetate emulsion, DMF, water, 2-methoxybutenoic acid, DMAP, 2-methyl-3-nitrotrifluorotoluene, 4-amino-1,2,4-triazole and sodium methoxide; the penetrant is penetrant T, and the contents of each component are shown in Table 1 below.

[0066] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0067] S1. Preparation of thermal insulation coating; 2-methyl-3-nitrotrifluorotoluene, 4-amino-1,2,4-triazole and DMF are placed in a microwave reactor, a suspension mixed with sodium methoxide and DMF is added, and microwave heating is performed at 75°C for 6 minutes; the mixture is then filtered and dried, dissolved in acetone, and separated by column chromatography using a chromatography solution having a volume ratio of ethyl acetate to petroleum ether of 1:5 to obtain a 2-methyl-3-nitrotrifluorotoluene amination product;

[0068] Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 400 r / min for 4 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, stirred at 1000 r / min for 30 min at 70°C; 2-methoxybutenoic acid and DMAP were added, maintained at 70°C, and stirred at 700 r / min for 30 min; finally, methylphenyl silicone resin, 2-methyl-3-nitrotrifluorotoluene amination product, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water were added, and stirred at 300 r / min for 15 min;

[0069] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0070] S3. Applying thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 7 mm and dry at 20°C.

[0071] Example 5

[0072] The present embodiment discloses a high temperature resistant butterfly valve and a production process thereof; a high temperature resistant butterfly valve, comprising a butterfly valve body, the surface of the butterfly valve body being coated with a thermal insulation coating, the thermal insulation coating comprising the following components: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazide, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, penetrant, polyvinyl acetate emulsion, DMF, water, 2-methoxybutenoic acid, DMAP, 2-methyl-3-nitrotrifluorotoluene, 4-amino-1,2,4-triazole and sodium methoxide; the penetrant is penetrant T, and the contents of each component are shown in Table 1 below.

[0073] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0074] S1. Preparation of thermal insulation coating; 2-methyl-3-nitrotrifluorotoluene, 4-amino-1,2,4-triazole and DMF are placed in a microwave reactor, a suspension mixed with sodium methoxide and DMF is added, and microwave heating is performed at 85°C for 8 minutes; the mixture is filtered and dried, dissolved in acetone, and separated by column chromatography using a chromatography solution having a volume ratio of ethyl acetate to petroleum ether of 1:5 to obtain a 2-methyl-3-nitrotrifluorotoluene amination product;

[0075] Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 500 r / min for 6 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, stirred at 1200 r / min for 40 min at 80°C; 2-methoxybutenoic acid and DMAP were added, kept at 80°C, stirred at 800 r / min for 40 min; finally, methylphenyl silicone resin, 2-methyl-3-nitrotrifluorotoluene amination product, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water were added, stirred at 400 r / min for 20 min;

[0076] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0077] S3. Application of thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 8 mm and dry at 24°C.

[0078] Example 6

[0079] The present embodiment discloses a high temperature resistant butterfly valve and a production process thereof; a high temperature resistant butterfly valve, comprising a butterfly valve body, the surface of the butterfly valve body being coated with a thermal insulation coating, the thermal insulation coating comprising the following components: methylphenyl silicone resin, sodium alginate, dodecyltrimethylammonium chloride, valeryl dihydrazide, dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, ceramic fiber, talcum powder, penetrant, polyvinyl acetate emulsion, DMF, water, 2-methoxybutenoic acid, DMAP, 2-methyl-3-nitrotrifluorotoluene, 4-amino-1,2,4-triazole and sodium methoxide; the penetrant is penetrant T, and the contents of each component are shown in Table 1 below.

[0080] A production process of a high temperature resistant butterfly valve comprises the following steps:

[0081] S1. Preparation of thermal insulation coating; 2-methyl-3-nitrotrifluorotoluene, 4-amino-1,2,4-triazole and DMF are placed in a microwave reactor, a suspension mixed with sodium methoxide and DMF is added, and microwave heating is performed at 80°C for 7 minutes; the mixture is then filtered and dried, dissolved in acetone, and separated by column chromatography using a chromatography solution having a volume ratio of ethyl acetate to petroleum ether of 1:5 to obtain a 2-methyl-3-nitrotrifluorotoluene amination product;

[0082] Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 450 r / min for 5 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, stirred at 1100 r / min for 35 min at 75°C; 2-methoxybutenoic acid and DMAP were added, maintained at 75°C, stirred at 750 r / min for 35 min; finally, methylphenyl silicone resin, 2-methyl-3-nitrotrifluorotoluene amination product, ceramic fiber, talc, penetrant, polyvinyl acetate emulsion and water were added, stirred at 350 r / min for 18 min;

[0083] S2. Pretreatment: Wash the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it;

[0084] S3. Applying thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 8 mm and dry at 22°C.

[0085] Example 7

[0086] The difference from Example 1 is that the thermal insulation coating further includes 2-methoxybutenoic acid and DMAP, and the contents of each component are shown in Table 2 below.

[0087] Example 8

[0088] The difference from Example 7 is that 2-methoxybutenoic acid is replaced by crotonaldehyde. The contents of each component are shown in Table 2 below.

[0089] Example 9

[0090] The difference from Example 7 is that sodium alginate is replaced by sodium citrate. The contents of each component are shown in Table 2 below.

[0091] Example 10

[0092] The difference from Example 1 is that the thermal insulation coating further includes 2-methyl-3-nitrotrifluorotoluene, and the content of each component is shown in Table 2 below.

[0093] Embodiment 11

[0094] The difference from Example 10 is that 2-methyl-3-nitrotrifluorotoluene is replaced by 3-nitropropiophenone. The contents of each component are shown in Table 2 below.

[0095] Example 12

[0096] On the basis of Example 10, the thermal insulation coating further includes 4-amino-1,2,4-triazole and sodium methoxide, and the content of each component is shown in Table 2 below.

[0097] Embodiment 13

[0098] The difference from Example 12 is that 4-amino-1,2,4-triazole is replaced by imidazole-4-sulfonyl chloride. The contents of each component are shown in Table 2 below.

[0099] Embodiment 14

[0100] The difference from Example 1 is that, in terms of weight ratio, sodium alginate: dodecyltrimethylammonium chloride: valeryl dihydrazide = 8:1:5, i.e. 8 parts of sodium alginate, 1 part of dodecyltrimethylammonium chloride, and 5 parts of valeryl dihydrazide.

[0101] Embodiment 15

[0102] The difference from Example 1 is that the penetrant T is replaced by the penetrant JFC.

[0103] Comparative Example

[0104] Comparative Example 1

[0105] The difference from Example 1 is that the components of the thermal insulation coating are only 15 parts of methylphenyl silicone resin, 10 parts of DMF and 20 parts of water.

[0106] Comparative Example 2

[0107] The difference from Example 1 is that sodium alginate is replaced by sodium citrate.

[0108] Comparative Example 3

[0109] The difference from Example 1 is that dodecyltrimethylammonium chloride is replaced by undecylimidazoline.

[0110] Comparative Example 4

[0111] The difference from Example 1 is that valeryl dihydrazide is replaced by 3-amino-2-pyridone.

[0112] Table 1 Component contents of Examples 1-6

[0113]

[0114]

[0115] Table 2 Component contents of Examples 7-13

[0116]

[0117] Performance testing

[0118] (1) Heat resistance test: The heat resistance temperature is determined in accordance with GB / T 1735-2009. The heat resistance temperature refers to the maximum time that the coating of the thermal insulation coating remains intact, does not change color, and does not delaminate after being placed in a muffle furnace at 500°C after the surface of the coating is dried. The test results are shown in Table 3 below.

[0119] Table 3 Performance test results of various embodiments and comparative examples

[0120] Heat resistance time (500℃) / min Example 1 258 Example 2 282 Example 3 264 Example 4 288 Example 5 317 Example 6 301 Example 7 269 Example 8 254 Example 9 227 Example 10 262 Embodiment 11 259 Example 12 277 Embodiment 13 264 Embodiment 14 263 Embodiment 15 256 Comparative Example 1 210 Comparative Example 2 223 Comparative Example 3 251 Comparative Example 4 239

[0121] (2) Adhesion test: Examples 1-6 were tested according to GB / T 9286-1988. The test results are shown in Table 4 below.

[0122] Table 4 Adhesion grade test results of Examples 1-6

[0123] Adhesion / Grade Example 1 2 Example 2 1 Example 3 2 Example 4 1 Example 5 1 Example 6 1

[0124] 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 high temperature resistant butterfly valve, characterized in that: It includes a butterfly valve body, the surface of which is coated with a heat-insulating coating, and the heat-insulating coating includes the following components in parts by weight: 15-18 parts of methylphenyl silicone resin; 8-9 parts of sodium alginate; 1-2 parts of dodecyltrimethylammonium chloride; 4-5 parts of valeryl dihydrazide; 1-2 parts of dicyclohexylcarbodiimide; 1-2 parts of 1-hydroxybenzotriazole; 2-3 parts of ceramic fiber; 1-2 parts talcum powder; 0.5-1 part of penetrant; 6-7 parts of polyvinyl acetate emulsion; 10-12 parts of DMF; 20-30 parts water; 0.6-0.8 parts of 2-methoxybutenoic acid; 0.1-0.2 parts DMAP; 0.8-1 part of 2-methyl-3-nitrobenzotrifluoride; 2-3 parts of 4-amino-1,2,4-triazole; 3-4 parts of sodium methoxide; 0.8-1 parts of 2-methyl-3-nitrotrifluorotoluene, 2-3 parts of 4-amino-1,2,4-triazole and 5-6 parts of DMF are placed in a microwave reactor, and a suspension mixed with 3-4 parts of sodium methoxide and 7-8 parts of DMF is added, and microwave heating is performed at 75-85° C. for 6-8 minutes; then the mixture is filtered and dried, dissolved in acetone, and separated by column chromatography using a chromatography solution having a volume ratio of ethyl acetate to petroleum ether of 1:5 to obtain a 2-methyl-3-nitrotrifluorotoluene amination product.

2. A high temperature resistant butterfly valve according to claim 1, characterized in that: In terms of weight ratio, the sodium alginate: dodecyltrimethylammonium chloride: valeryl dihydrazide = 8:1:

5.

3. A high temperature resistant butterfly valve according to claim 1, characterized in that: The penetrant is penetrant T.

4. The production process of a high temperature resistant butterfly valve according to claim 1, characterized in that: The steps include: S1. Preparation of thermal insulation coating; Sodium alginate, dodecyltrimethylammonium chloride and DMF were mixed, stirred at 400-500 r / min for 4-6 min, then valeryl dihydrazide, dicyclohexylcarbodiimide and 1-hydroxybenzotriazole were added, and stirred at 1000-1200 r / min for 30-40 min at 70-80°C; Continue to add 0.6-0.8 parts of 2-methoxybutenoic acid and 0.1-0.2 parts of DMAP, maintain 70-80°C, and stir at 700-800 r / min for 30-40 minutes; Finally, add methylphenyl silicone resin, 2-methyl-3-nitrotrifluorotoluene amination product, ceramic fiber, talcum powder, penetrant, polyvinyl acetate emulsion and water, and stir at a speed of 300-400 r / min for 15-20 min; S2. Pre-processing; After washing the butterfly valve body with water, place it in a pickling tank for pickling, then wash it with water, dry it, and polish it; S3. Applying thermal insulation coating: Apply thermal insulation coating to the treated butterfly valve body with a coating thickness of 7-8 mm and dry at 20-24°C.

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