Corrosion-resistant easy-to-disassemble high-temperature insulation shell, preparation method thereof and corrosion-resistant easy-to-disassemble high-temperature insulation sleeve

Abstract

The invention belongs to the technical field of pipeline heat preservation, and particularly relates to a corrosion-resistant high-temperature heat preservation shell easy to disassemble, a preparation method of the corrosion-resistant high-temperature heat preservation shell and a corrosion-resistant high-temperature heat preservation sleeve easy to disassemble. The invention relates to a preparation method of a corrosion-resistant easy-to-disassemble high-temperature thermal insulation shell, the thermal insulation shell is formed by buckling two half-cavity shells, and the method comprises the following steps: respectively preparing a dicyclopentadiene resin system and an epoxy resin system; the preparation method comprises the following steps: fully stirring a dicyclopentadiene resin system and an epoxy resin system, uniformly mixing, and storing at constant temperature to prepare a mixed resin feed liquid; the mixed resin liquid is injected into a mold, curing, demolding and heating post-treatment are conducted, and the half-cavity shell is prepared. The prepared corrosion-resistant easy-to-disassemble high-temperature heat preservation shell is optimized in formula, improves the glass transition temperature, is more suitable for protection of high-temperature valves and high-temperature pipelines, is not prone to deformation and failure, can replace a traditional metal shell, and has the advantages of being good in heat insulation, resistant to corrosion and capable of being repeatedly used.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline insulation, and specifically relates to a corrosion-resistant and easily disassembled high-temperature insulation shell and a preparation method thereof, and a corrosion-resistant and easily disassembled high-temperature insulation sleeve. Background Art

[0002] In industry, pipes and valves are used to transport heat source materials. In order to prevent heat loss, the valves are often wrapped with an insulation layer, and a metal protective layer is wrapped outside the insulation layer. Although this method can play a role in heat preservation, it is not very convenient to install, repair and disassemble, and can only be used once. In addition, the metal protective layer has poor insulation performance, heat is more likely to be lost, and it is more susceptible to corrosion in the environment of a chemical plant.

[0003] Polydicyclopentadiene (PDCPD) is a thermosetting polymer resin material derived from dicyclopentadiene (DCPD) by ring-opening metathesis polymerization (ROMP). It has excellent properties of high flexural modulus and high impact strength, as well as low temperature resistance and corrosion resistance. As an emerging polymer material, PDCPD is widely used in vehicle housings, chemical pipelines, medical equipment and other fields, and the market demand is also increasing. The insulation shells currently used in high-temperature pipelines and high-temperature valves at higher temperatures have put forward higher requirements on the insulation shell materials' thermal insulation properties, thermal insulation properties, and resistance to thermal deformation.

[0004] The existing insulation shell or insulation cover is complicated to install and inconvenient to disassemble. CN219655599U discloses an elbow pipe insulation cover, which uses Velcro on the surface for adhesion, auxiliary adhesive, and connecting rope connection, but this method will quickly lose the corresponding connection effect due to high temperature, and it is not suitable for high temperature pipe insulation. Summary of the invention

[0005] The purpose of the present invention is to provide a corrosion-resistant and easily disassembled high-temperature insulation shell and a preparation method thereof, and a corrosion-resistant and easily disassembled high-temperature insulation sleeve, so as to solve the problems of insufficient thermal insulation performance, thermal insulation performance and thermal deformation resistance of the PDCDP high-temperature insulation shell in the prior art.

[0006] In order to achieve the above object, according to one aspect of the present invention, a method for preparing a corrosion-resistant and easily disassembled high-temperature insulation shell is provided, wherein the insulation shell is composed of two half-cavity shells buckled together, and the method comprises the following steps:

[0007] S1, respectively preparing a dicyclopentadiene resin system and an epoxy resin system; wherein the dicyclopentadiene resin system is prepared by dissolving a Grubbs second-generation catalyst in cyclohexylbenzene, adding a retarder and an anti-aging agent to prepare a catalyst solution, and mixing the prepared catalyst solution with dicyclopentadiene to prepare a dicyclopentadiene resin system; the epoxy resin system is prepared by mixing an anhydride curing agent and an accelerator with an epoxy resin to prepare an epoxy resin system;

[0008] S2, fully stirring the dicyclopentadiene resin system and the epoxy resin system, mixing them evenly, and storing them at a constant temperature to obtain a mixed resin liquid;

[0009] S3, injecting the mixed resin liquid into the mold, curing, demoulding, heating and post-processing to obtain a half-cavity shell.

[0010] Furthermore, the molar ratio of the Grubbs second-generation catalyst to dicyclopentadiene is 1:5000 to 1:15000.

[0011] Furthermore, the mass ratio of the Grubbs second-generation catalyst to cyclohexylbenzene is 1:100 to 1:400.

[0012] Furthermore, the dissolution temperature of the Grubbs second-generation catalyst in cyclohexylbenzene is 40-60°C.

[0013] Furthermore, the retarder is triphenylphosphine, tributyl phosphite or tributyl phosphate.

[0014] Furthermore, the molar ratio of the Grubbs second generation catalyst to tributyl phosphite is 1:0.05 to 1:0.25.

[0015] Furthermore, the antioxidant is any one of p-tert-butylphenol, tert-butylhydroquinone, aniline, 2-methylaniline, etc., or a combination of several of them.

[0016] Furthermore, the epoxy resin is bisphenol A epoxy resin.

[0017] Furthermore, the acid anhydride curing agent is selected from methyl nadic anhydride, methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride, phthalic anhydride, and other one or more mixed acid anhydride curing agents.

[0018] Furthermore, the dicyclopentadiene resin system accounts for 5% to 10% of the total mass of the mixed resin liquid.

[0019] Furthermore, in step S3, the curing temperature of the mixed resin liquid is 60° C. to 90° C., and the curing time is 3 to 5 minutes.

[0020] Furthermore, in step S3, the post-heating treatment is carried out in an oven, and the temperature is raised to 120-180° C. and kept for 1-2 hours.

[0021] According to another aspect of the present invention, a corrosion-resistant and high-temperature insulation shell is also provided. The insulation shell is made by the above-mentioned preparation method. The insulation shell is composed of two half-cavity shells that are buckled together. A first clamping portion is formed on at least one side wall of the half-cavity shell along the first direction, and a second clamping portion opposite to the first clamping portion is formed on at least one side wall of the other half-cavity shell along the first direction. When the first clamping portion and the second clamping portion are mutually clamped, the buckling of the insulation shell is completed, and a female connection structure with a recess is formed on one side wall of the half-cavity shell along the second direction, and a male connection structure is formed on the other side wall of the half-cavity shell opposite to the female connection structure. When the insulation shell is connected using a locking structure, the female connection structure of one insulation shell is connected to the male connection structure of the other insulation shell.

[0022] Furthermore, the size and shape of the inner cavity of the insulation shell are compatible with the valve shape and / or pipeline shape.

[0023] According to another aspect of the present invention, a corrosion-resistant high-temperature insulation shell is provided, comprising an insulation shell, an insulation layer and an insulating layer, wherein the insulation layer is arranged between the insulation shell and the insulating layer, and the insulation shell is the corrosion-resistant high-temperature insulation shell of the present invention.

[0024] Furthermore, the thermal insulation layer is a thermal insulation material with a hollow structure such as aluminum silicate fiber felt or glass wool.

[0025] Furthermore, the heat insulation layer is aluminum foil.

[0026] The technical effects of the present invention are as follows:

[0027] 1. The corrosion-resistant and easily disassembled high-temperature insulation shell of the present invention has an optimized formula, which increases the glass transition temperature and is more suitable for the protection of high-temperature valves and high-temperature pipelines, and is not prone to deformation and failure.

[0028] 2. The corrosion-resistant and easily disassembled high-temperature insulation shell of the present invention is composed of two half-cavity shells that are buckled together, and the half-cavity shells have both a snap-on structure and a lock structure, which can be buckled and installed very conveniently, so that different insulation shells are connected to each other into a whole and are easy to disassemble.

[0029] 3. The corrosion-resistant and easily disassembled high-temperature heat-insulating shell or heat-insulating sleeve of the present invention replaces the traditional metal shell and has the advantages of good heat insulation, corrosion resistance and repeated use.

[0030] 4. The insulation material of the corrosion-resistant and easily disassembled high-temperature insulation cover of the present invention is pre-placed in the insulation shell and can be directly installed, which is more conducive to maintenance and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shown is a schematic diagram of the cross-sectional structure along the first direction of the thermal insulation sleeve provided in Example 6 of the present invention.

[0032] Figure 2 Shown is a schematic diagram of the cross-sectional structure along the first direction of the thermal insulation shell provided in Example 6 of the present invention.

[0033] Figure 3 The cross-sectional structure schematic diagram along the second direction of the thermal insulation shell provided in Example 6 of the present invention.

[0034] In the figure: 1. valve; 2. valve insulation shell; 3. pipeline insulation shell; 31, 32 half-cavity shells; 4. insulation layer; 5. pipeline; 6. thermal insulation layer; 7. locking structure; 71. female connection structure; 72. male connection structure; 8. snap-fit ​​structure; 81. first snap-fit ​​part; 82. second snap-fit ​​part. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in this application, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0036] Example 1 Preparation of corrosion-resistant and easily disassembled high-temperature insulation shell and glass transition temperature test:

[0037] The corrosion-resistant and easily disassembled high-temperature insulation shell is composed of two half-cavity shells that are buckled together. The preparation method of the half-cavity shell is as follows:

[0038] (1) preparing a dicyclopentadiene resin system: Grubbs second-generation catalyst and cyclohexylbenzene are prepared in a mass ratio of 1:100, and the temperature is raised to 60° C. to completely dissolve the catalyst. Then, according to the molar ratio of catalyst to retarder of 1:0.05, the molar ratio of antioxidant to dicyclopentadiene monomer of 60, and the molar ratio of catalyst to dicyclopentadiene monomer of 1:10000, retarder tributyl phosphite and antioxidant tert-butyl hydroquinone are added to prepare a catalyst solution, and then the prepared catalyst solution is added to the dicyclopentadiene monomer (the content of comonomer tricyclopentadiene is 5%).

[0039] (2) preparing an epoxy resin system: mixing E51 epoxy resin, methyltetrahydrophthalic anhydride and ethylenediamine alcohol in a mass ratio of 100:50:10;

[0040] (3) The dicyclopentadiene resin system prepared in (1) and the epoxy resin prepared in (2) are prepared in a mass ratio of 95:5, and mixed and stirred evenly to obtain a mixed resin liquid.

[0041] (4) The mixed resin liquid is injected into the mold at a mold temperature of 60°C for 5 minutes. After demolding, the mold is placed in an oven and heated to 160°C for 60 minutes to obtain a half-cavity shell.

[0042] The half-cavity shell obtained in (4) was sampled and tested for glass transition temperature.

[0043] The half-cavity shell obtained in step (4) has a snap-fitting portion. When the snap-fitting portions of the two matching half-cavity shells are snap-fitted to each other, the corrosion-resistant, easily disassembled, high-temperature heat-insulating shell is snap-fitted.

[0044] Example 2 Preparation of corrosion-resistant and easily disassembled high-temperature insulation shell and glass transition temperature test:

[0045] The corrosion-resistant and easily disassembled high-temperature insulation shell is composed of two half-cavity shells that are buckled together. The preparation method of the half-cavity shell is as follows:

[0046] (1) preparing a dicyclopentadiene resin system: Grubbs second-generation catalyst and cyclohexylbenzene are prepared in a mass ratio of 1:200, and the temperature is raised to 60° C. to completely dissolve the catalyst. Then, according to the molar ratio of catalyst to retarder of 1:0.05, the molar ratio of antioxidant to dicyclopentadiene monomer of 60, and the molar ratio of catalyst to dicyclopentadiene monomer of 1:10000, retarder tributyl phosphite and antioxidant tert-butyl hydroquinone are added to prepare a catalyst solution, and then the prepared catalyst solution is added to the dicyclopentadiene monomer (the content of comonomer tricyclopentadiene is 5%).

[0047] (2) preparing an epoxy resin system: mixing E51 epoxy resin, methyltetrahydrophthalic anhydride and ethylenediamine alcohol in a mass ratio of 100:50:10;

[0048] (3) The dicyclopentadiene resin system prepared in (1) and the epoxy resin prepared in (2) are prepared in a mass ratio of 90:10, and mixed and stirred to obtain a mixed resin liquid.

[0049] (4) The mixed resin liquid is injected into the mold at a mold temperature of 60°C for 5 minutes. After demolding, the mold is placed in an oven and heated to 160°C for 60 minutes to obtain a half-cavity shell.

[0050] The half-cavity shell obtained in (4) was sampled and tested for glass transition temperature.

[0051] The half-cavity shell obtained in step (4) has a snap-fitting portion. When the snap-fitting portions of the two matching half-cavity shells are snap-fitted to each other, the corrosion-resistant, easily disassembled, high-temperature heat-insulating shell is snap-fitted.

[0052] Example 3 Preparation of corrosion-resistant and easily disassembled high-temperature insulation shell and glass transition temperature test:

[0053] The corrosion-resistant and easily disassembled high-temperature insulation shell is composed of two half-cavity shells that are buckled together. The preparation method of the half-cavity shell is as follows:

[0054] (1) preparing a dicyclopentadiene resin system: Grubbs second generation catalyst and cyclohexylbenzene are prepared in a mass ratio of 1:400, the temperature is raised to 40° C. to completely dissolve the catalyst, and then, in a molar ratio of catalyst to retarder of 1:0.25, a molar ratio of antioxidant to dicyclopentadiene monomer of 60, and a molar ratio of catalyst to dicyclopentadiene monomer of 1:5000, retarder tributyl phosphite and antioxidant p-tert-butylphenol are added to prepare a catalyst solution, and then the prepared catalyst solution is added to the dicyclopentadiene monomer (the content of comonomer tricyclopentadiene is 5%);

[0055] (2) preparing the epoxy resin system: mixing E51 epoxy resin, methyl nadic anhydride and ethylenediamine alcohol in a mass ratio of 100:50:10;

[0056] (3) The dicyclopentadiene resin system prepared in (1) and the epoxy resin prepared in (2) are prepared in a mass ratio of 90:10, and mixed and stirred to obtain a mixed resin liquid;

[0057] (4) The mixed resin liquid is injected into the mold at a mold temperature of 60°C for 5 minutes. After demolding, the mold is placed in an oven and heated to 180°C for 60 minutes to obtain a half-cavity shell.

[0058] The half-cavity shell obtained in (4) was sampled and tested for glass transition temperature.

[0059] The half-cavity shell obtained in step (4) has a snap-fitting portion. When the snap-fitting portions of the two matching half-cavity shells are snap-fitted to each other, the corrosion-resistant, easily disassembled, high-temperature heat-insulating shell is snap-fitted.

[0060] Example 4 Preparation of corrosion-resistant and easily disassembled high-temperature insulation shell and glass transition temperature test:

[0061] The corrosion-resistant and easily disassembled high-temperature insulation shell is composed of two half-cavity shells that are buckled together. The preparation method of the half-cavity shell is as follows:

[0062] (1) preparing a dicyclopentadiene resin system: Grubbs II catalyst and cyclohexylbenzene are prepared in a mass ratio of 1:400, and the temperature is raised to 40° C. to completely dissolve the catalyst. Then, according to the molar ratio of catalyst to retarder of 1:0.25, the molar ratio of antioxidant to dicyclopentadiene monomer of 60, and the molar ratio of catalyst to dicyclopentadiene monomer of 1:15000, retarder triphenylphosphine and antioxidant aniline are added to prepare a catalyst solution, and then the prepared catalyst solution is added to the dicyclopentadiene monomer (the content of comonomer tricyclopentadiene is 3%).

[0063] (2) preparing the epoxy resin system: mixing E51 epoxy resin, phthalic anhydride and ethylenediamine alcohol in a mass ratio of 100:50:10;

[0064] (3) The dicyclopentadiene resin system prepared in (1) and the epoxy resin prepared in (2) are prepared in a mass ratio of 95:5, and mixed and stirred to obtain a mixed resin liquid;

[0065] (4) The mixed resin liquid is injected into the mold at a mold temperature of 90°C for 3 minutes. After demolding, the mold is placed in an oven and heated to 120°C for 120 minutes to obtain a half-cavity shell.

[0066] The half-cavity shell obtained in (4) was sampled and tested for glass transition temperature.

[0067] The half-cavity shell obtained in step (4) has a snap-fitting portion. When the snap-fitting portions of the two matching half-cavity shells are snap-fitted to each other, the corrosion-resistant, easily disassembled, high-temperature heat-insulating shell is snap-fitted.

[0068] Example 5 Preparation of corrosion-resistant and easily disassembled high-temperature insulation shell and glass transition temperature test:

[0069] The corrosion-resistant and easily disassembled high-temperature insulation shell is composed of two half-cavity shells that are buckled together. The preparation method of the half-cavity shell is as follows:

[0070] (1) preparing a dicyclopentadiene resin system: Grubbs second generation catalyst and cyclohexylbenzene are prepared in a mass ratio of 1:200, the temperature is raised to 50° C. to completely dissolve the catalyst, and then, in a molar ratio of catalyst to retarder of 1:0.15, a molar ratio of antioxidant to dicyclopentadiene monomer of 60, and a molar ratio of catalyst to dicyclopentadiene monomer of 1:10000, retarder tributyl phosphate and antioxidant 2-methylaniline are added to prepare a catalyst solution, and then the prepared catalyst solution is added to the dicyclopentadiene monomer (the content of comonomer tricyclopentadiene is 3%);

[0071] (2) preparing an epoxy resin system: mixing E51 epoxy resin, methyl hexahydrophthalic anhydride and ethylenediamine alcohol in a mass ratio of 100:50:10;

[0072] (3) The dicyclopentadiene resin system prepared in (1) and the epoxy resin prepared in (2) are prepared in a mass ratio of 90:10, and mixed and stirred to obtain a mixed resin liquid;

[0073] (4) The mixed resin liquid is injected into the mold at a mold temperature of 90°C for 3 minutes. After demolding, the mold is placed in an oven and heated to 150°C for 60 minutes to obtain a half-cavity shell.

[0074] The half-cavity shell obtained in (4) was sampled and tested for glass transition temperature.

[0075] The half-cavity shell obtained in step (4) has a snap-fitting portion. When the snap-fitting portions of the two matching half-cavity shells are snap-fitted to each other, the corrosion-resistant, easily disassembled, high-temperature heat-insulating shell is snap-fitted.

[0076] Comparative Example 1 Preparation of polydicyclopentadiene resin and glass transition temperature test:

[0077] (1) preparing a dicyclopentadiene resin system: Grubbs second-generation catalyst and cyclohexylbenzene are prepared in a mass ratio of 1:200, and the temperature is raised to 60° C. to completely dissolve the catalyst. Then, according to the molar ratio of catalyst to retarder of 1:0.05, the molar ratio of antioxidant to dicyclopentadiene monomer of 60, and the molar ratio of catalyst to dicyclopentadiene monomer of 1:10000, retarder tributyl phosphite and antioxidant tert-butyl hydroquinone are added to prepare a catalyst solution, and then the prepared catalyst solution is added to the dicyclopentadiene monomer (the content of comonomer tricyclopentadiene is 5%).

[0078] (2) The dicyclopentadiene resin system prepared in (1) was injected into a mold at a mold temperature of 60° C. for 5 minutes. After demolding, the mold was placed in an oven and heated to 160° C. for post-treatment for 60 minutes to obtain a polydicyclopentadiene resin.

[0079] The polydicyclopentadiene resin obtained in (2) was sampled and tested for glass transition temperature.

[0080] The glass transition temperatures of the resins obtained in Examples 1 to 5 and Comparative Example 1 are shown in Table 1.

[0081] Table 1 Glass transition temperature test results

[0082]

[0083]

[0084] As shown in Table 1, compared with Comparative Example 1, Examples 1 to 5 add an epoxy resin system, and the use of the dual system of dicyclopentadiene and epoxy resin increases the glass transition temperature, because the two systems polymerize to form a grid structure, making the performance of the material surpass the corresponding single-component polymer. For the present invention, the glass transition temperature of the material is increased, so that the material can be used at a higher temperature and is not prone to deformation and failure.

[0085] Example 6 Corrosion-resistant and easily disassembled high-temperature insulation sleeve, corrosion-resistant and easily disassembled high-temperature insulation shell

[0086] See also Figure 1 , the outside of the valve 1 and the pipeline 5 are sequentially laid with an insulation layer 6, an insulation layer 4 and a corrosion-resistant and easily removable high-temperature insulation shell (hereinafter referred to as the insulation shell). In this embodiment, the insulation shell is divided into a valve insulation shell 2 and a pipeline insulation shell 3. Specifically, the insulation layer 4 is an insulation material with a hollow structure such as aluminum silicate fiber felt or glass wool. Specifically, the insulation layer 6 is aluminum foil. Specifically, the preparation method of the insulation shell refers to Examples 1 to 5. When in use, a thermal insulation layer is first laid on the outside of the valve 1 and the pipeline 5, and then the insulation layer 4 is laid, and finally the insulation shells 2 and 3 are connected to the outside. In order to further facilitate installation and avoid the movement of the insulation layer 6 and the insulation layer 4, the insulation layer 4 and the insulation layer 6 are usually laid and fixed in the insulation shell to form a corrosion-resistant and easily removable high-temperature insulation cover (hereinafter referred to as the insulation cover). The insulation cover includes an insulation shell, an insulation layer 4 and an insulation layer 6, and the insulation layer 4 is arranged between the insulation shell and the insulation layer 6. The above-mentioned insulation layer 4 and heat insulation layer 6 and other insulation materials are pre-placed in the insulation shell, and the insulation sleeve can be directly installed, which is more conducive to maintenance and disassembly. The inner cavity size and shape of the insulation sleeve are compatible with the shape of the valve 1 and / or the shape of the pipeline 5.

[0087] See also Figure 3 The insulation shell is composed of two half-cavity shells 31 and 32 that are buckled together. The half-cavity shells 31 and 32 are provided with a buckle structure 8. A first clamping portion 81 is formed on at least one side wall of the half-cavity shell 31 along the first direction, and a second clamping portion 82 opposite to the first clamping portion 81 is formed on at least one side wall of the other half-cavity shell 32 along the first direction. When the first clamping portion 81 and the second clamping portion 82 are mutually buckled, the buckling of the insulation shell is completed. The size and shape of the inner cavity of the insulation shell are adapted to the shape of the valve 1 and / or the shape of the pipeline 5.

[0088] See also Figure 2, the half-cavity shells 31 and 32 are provided with a locking structure 7. A female connection structure 71 with a recess is formed on one side wall of the half-cavity shell along the second direction, and a male connection structure 72 is formed on the other side wall of the half-cavity shell opposite to the female connection structure 71. When the heat-insulating shells are connected using the locking structure 7, the female connection structure 71 of one heat-insulating shell 2 is connected to the male connection structure 72 of another heat-insulating shell 3. And so on, so that different heat-insulating shells are connected to each other into a whole.

[0089] The insulation shell adopts the buckle connection method of half-cavity shell, which is more convenient to install and disassemble than the one-piece molding method, and does not take up storage space. Specifically, the half-cavity shell adopts a dual-system material of dicyclopentadiene and epoxy resin. The use of this dual system increases the glass transition temperature, so that the half-cavity shell can be used at a higher temperature, and is not prone to deformation and failure, so that the locking structure and the buckle structure can be more stable, and the insulation shell can be made thinner and lighter. When installing the insulation cover, first buckle the two half-cavity shells of the pipeline insulation cover on the pipeline from both sides of the pipeline, connect the buckle structure, and then buckle the two half-cavity shells of the valve insulation cover on the valve from both sides, and then connect the valve insulation cover and the pipeline insulation cover together through the buckle structure on the edge of the half-cavity shell. When the insulation sleeve is in use, the insulation layer 6 wraps the valve 1 and / or pipeline 5 inwardly, and then passes through the insulation layer 4 and the insulation shell, so that the insulation sleeve has the effect of thermal insulation and heat insulation, preventing the valve 1 and / or pipeline 5 from losing heat, and at the same time resisting the external impact force, thereby better protecting the valve and / or pipeline.

Claims

1. A method for preparing a corrosion-resistant and easily disassembled high-temperature insulation shell, wherein the insulation shell is composed of two half-cavity shells buckled together, and the method comprises the following steps: S1, respectively preparing a dicyclopentadiene resin system and an epoxy resin system; wherein the dicyclopentadiene resin system is prepared by dissolving a Grubbs second-generation catalyst in cyclohexylbenzene, adding a retarder and an anti-aging agent to prepare a catalyst solution, and mixing the prepared catalyst solution with dicyclopentadiene to prepare a dicyclopentadiene resin system; the epoxy resin system is prepared by mixing an anhydride curing agent and an accelerator with an epoxy resin to prepare an epoxy resin system; S2, fully stirring the dicyclopentadiene resin system and the epoxy resin system, mixing them evenly, and storing them at a constant temperature to obtain a mixed resin liquid; S3, injecting the mixed resin liquid into the mold, curing, demoulding, heating and post-processing to obtain a half-cavity shell.

2. The method according to claim 1, characterized in that The retarder is triphenylphosphine, tributyl phosphite or tributyl phosphate; the antioxidant is at least one of p-tert-butylphenol, tert-butylhydroquinone, aniline and 2-methylaniline; the anhydride curing agent is at least one of methyl nadic anhydride, methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride and phthalic anhydride; and the epoxy resin is bisphenol A epoxy resin.

3. The method according to claim 2, characterized in that The molar ratio of the Grubbs second generation catalyst to tributyl phosphite is 1:0.05 to 1:0.

25.

4. The method according to claim 2, characterized in that: The molar ratio of the Grubbs second-generation catalyst to dicyclopentadiene is 1:5000-1:15000; the mass ratio of the Grubbs second-generation catalyst to cyclohexylbenzene is 1:100-1:400; and the dicyclopentadiene resin system accounts for 5%-10% of the total mass of the mixed resin liquid.

5. The method according to claim 2, characterized in that: In the step S3, the mixed resin liquid is cured at a temperature of 60°C to 90°C for 3 to 5 minutes; the post-heating treatment is carried out in an oven at a temperature of 120 to 180°C and kept for 1 to 2 hours.

6. The method according to claim 5, characterized in that The dissolution temperature of the Grubbs second-generation catalyst in cyclohexylbenzene is 40-60°C.

7. A corrosion-resistant high-temperature insulation shell, which is prepared by the method of any one of claims 1 to 6, and the insulation shell is composed of two half-cavity shells that are buckled together, and a first clamping portion is formed on at least one side wall of the half-cavity shell along the first direction, and a second clamping portion opposite to the first clamping portion is formed on at least one side wall of the other half-cavity shell along the first direction, when the first clamping portion and the second clamping portion are mutually clamped, the buckling of the insulation shell is completed, and a female connection structure with a recess is formed on one side wall of the half-cavity shell along the second direction, and a male connection structure is formed on the other side wall of the half-cavity shell opposite to the female connection structure, and when the insulation shell is connected using a locking structure, the female connection structure of one insulation shell is connected to the male connection structure of the other insulation shell.

8. The heat-insulating shell according to claim 7, characterized in that: The size and shape of the inner cavity of the heat-insulating shell are matched with the shape of the valve and / or the shape of the pipeline.

9. A corrosion-resistant high-temperature insulation sleeve, comprising the insulation shell, insulation layer and thermal insulation layer as claimed in claim 7 or 8, wherein the insulation layer is arranged between the insulation shell and the thermal insulation layer.

10. The thermal insulation cover according to claim 9, characterized in that: The thermal insulation layer is aluminum silicate fiber felt or glass wool, and the heat insulating layer is aluminum foil.

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