Release agent for preparing thin-wall ceramic-based pipe fitting as well as preparation method and application of release agent

Abstract

The invention discloses a release agent for preparing a thin-wall ceramic-based pipe fitting and a preparation method and application of the release agent, and solves the problems that in the preparation process of an existing thin-wall ceramic-based composite material pipe fitting, the forming quality of the pipe fitting is affected due to the fact that large friction force exists on a binding face between a shaping pre-tightening device and the ceramic pipe fitting, and the forming quality of the ceramic pipe fitting is affected. In order to solve the technical problems that in the prior art, in the prior art, in the prior art, the demolding difficulty can be increased, and even pipe fittings can be damaged in the demolding process, the material comprises the following components in percentage by weight: 0.5-1% of a phenolic antioxidant, 1-2% of a petroleum sulfonate antirust agent, 2-3% of a sulfur-phosphorus type extreme pressure agent, 3-5% of molybdenum disulfide powder, 2-5% of graphite powder and the balance of synthetic ester base oil, the sum of the weight percentages of the materials is 100%. The prepared release agent has the advantages of being good in lubricity, resistant to high temperature, good in chemical stability, environmentally friendly, non-toxic and easy to clean.

Description

Technical Field

[0001] The invention relates to a release agent for ceramic-based composite material pipe fittings, and in particular to a release agent for preparing thin-walled ceramic-based pipe fittings, and a preparation method and application thereof. Background Art

[0002] Ceramic matrix composites have been widely used in aerospace, energy, chemical industry and many other fields due to their excellent properties, such as high specific strength, high specific modulus, high temperature resistance and corrosion resistance. As an important structural part, thin-walled ceramic matrix composite pipe fittings face many challenges in actual production.

[0003] However, since thin-walled ceramic-based composite pipes are prone to deformation and cracking during the preparation process, effective shaping and pre-tightening devices and preparation methods are needed to ensure their quality. However, in actual applications, there is a large friction between the fitting surface of the shaping and pre-tightening device and the ceramic pipe, which affects the molding quality of the pipe, increases the difficulty of demolding, and may even cause damage to the pipe during demolding.

[0004] In order to solve the above problems, lubricants are usually added between the shaping pre-tightening device and the ceramic pipe fittings. Although traditional lubricants can reduce friction to a certain extent, they often have problems such as unstable lubrication effect, volatility, and environmental unfriendliness. In addition, the selection and use of traditional lubricants lack scientific basis and are often selected based on experience, which not only affects the molding quality of pipe fittings, but also increases production costs and production cycles. In addition, traditional demoulding lubricants are very easy to react with PCS or acetone solvents, and even dissolve and fall off. Moreover, traditional lubricants at high temperatures have poor high temperature resistance and are easy to decompose. Or they are rich in silicone and introduce other impurities. Different ceramic-based composite pipe fittings have different requirements for demoulding agents, and traditional demoulding agents are difficult to meet diverse needs. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that in the existing preparation process of thin-walled ceramic-based composite material pipe fittings, there is a large friction between the fitting surface between the shaping pre-tightening device and the ceramic pipe fitting, which affects the molding quality of the pipe fitting, increases the difficulty of demolding, and may even cause the pipe fitting to be damaged during the demolding process. A release agent for preparing thin-walled ceramic-based pipe fittings, a preparation method and application thereof are provided.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The present invention provides a release agent for preparing thin-walled ceramic-based pipe fittings, which is special in that the components and weight percentages of the material are:

[0008] 0.5-1% phenol antioxidant, 1-2% petroleum sulfonate rust inhibitor, 2-3% sulfur-phosphorus extreme pressure agent, 3-5% molybdenum disulfide powder, 2-5% graphite powder, and the remaining ingredients are synthetic ester base oils. The sum of the weight percentages of the above materials is 100%.

[0009] Among them, synthetic ester base oil is a high temperature resistant, low volatility synthetic oil that can maintain stable lubrication performance at high temperatures and has good fluidity at different temperatures, adapting to the complex molding environment of ceramic matrix composite pipes. The use of specific antioxidants, rust inhibitors and extreme pressure agents can not only effectively prevent the mold release lubricant from oxidizing and deteriorating at high temperatures and extend its service life, but also prevent the mold from rusting and improve the wear resistance of the mold. At the same time, it provides good lubrication performance under high pressure to prevent adhesive wear between the mold and the pipe.

[0010] The combination of graphite and molybdenum disulfide uses the layered structure of graphite to reduce friction, and the high temperature resistance of molybdenum disulfide ensures the lubrication effect in high temperature environment. The two complement each other and further improve the demolding effect.

[0011] Furthermore, the phenolic antioxidant is 2,6-di-tert-butyl-α-dimethylamino-p-cresol, which can prevent the demoulding lubricant from oxidizing and deteriorating at high temperatures and extend its service life.

[0012] Furthermore, the petroleum sulfonate rust inhibitor is one of calcium petroleum sulfonate and barium petroleum sulfonate, which can prevent the mold from rusting and ensure the surface quality of the mold.

[0013] Furthermore, the sulfur-phosphorus type extreme pressure agent is sulfided isobutylene, which can provide good lubrication performance under high pressure and prevent adhesive wear between the mold and the pipe.

[0014] Furthermore, the synthetic ester base oil is pentaerythritol oleate.

[0015] At the same time, the present invention also provides a method for preparing a release agent for preparing a thin-walled ceramic-based pipe fitting, using the components and weight percentages of the materials described above, which is special in that it includes the following steps:

[0016] Step 1, heating the synthetic ester base oil to 50°C to 70°C;

[0017] Step 2, 0.5-1% of a phenolic antioxidant, 1-2% of a petroleum sulfonate rust inhibitor, and 2-3% of a sulfur-phosphorus extreme pressure agent are sequentially added to the heated synthetic ester base oil in step 1, and stirred to obtain a mixed solution A;

[0018] Step 3, 3-5% of molybdenum disulfide powder and 2-5% of graphite powder are added to the mixed solution A in sequence, and stirred to obtain a mixed solution B;

[0019] Step 4: Filter the mixed solution B and cool it to room temperature to obtain a release agent for preparing thin-walled ceramic-based pipe fittings.

[0020] Furthermore, the stirring in step 2 is specifically: 500r / min to 800r / min, and the stirring time is 30min to 60min; ensuring that the additive is fully dissolved in the synthetic ester base oil to form a uniform mixed liquid.

[0021] The stirring in step 3 is specifically: 800r / min~1000r / min, and the stirring time is 60min~90min, so that the molybdenum disulfide and graphite powder are fully dispersed in the synthetic ester base oil to form a stable lubricant system.

[0022] Furthermore, in step 4, the filtering is specifically:

[0023] Filter out particles with a particle size of not less than 1000 mesh through a coarse filter;

[0024] Then filter out particles with a particle size of not less than 800 mesh through a fine filter; the purity of the release agent can be ensured by the above coarse filtration and fine filtration.

[0025] The present invention also provides an application of a release agent for preparing thin-walled ceramic-based pipe fittings. The special feature of the release agent is that it is used to be applied on a core mold for preparing thin-walled ceramic-based pipe fittings, adheres to the core mold to form a dense lubricating isolation layer, and smoothly separates the ceramic-based composite material from the core mold without adhesion. The release agent is environmentally friendly and non-toxic, easy to clean, and has a simple preparation method. It can meet the needs of use in high temperature and high pressure environments, and in particular, it can achieve lubrication and protection of the ceramic-based composite material and the metal-based core mold, and has excellent chemical stability.

[0026] Furthermore, the coating thickness is 0.5mm-2mm.

[0027] The present invention discloses a release agent for preparing thin-walled ceramic-based pipe fittings, and its preparation method and application have the following beneficial effects:

[0028] 1. Chemical stability: The material components and their proportions used in the release agent of the present invention are set so that the release agent will not chemically react with the ceramic-based composite material, and has good chemical stability. It will not chemically react with the ceramic-based composite material and will not affect the performance and quality of the pipe fittings; the release agent can be smoothly demoulded without damaging the pipe fittings, thereby ensuring the integrity and performance stability of the pipe fittings.

[0029] 2. Lubricity: The mold release agent of the present invention can form a uniform and stable lubricating film between the mold and the pipe fitting, effectively reducing friction and making the pipe fitting demoulding smoothly. Compared with traditional mold release agents, its lubricating effect is more significant, which can greatly reduce the resistance during demoulding and improve production efficiency.

[0030] 3. High temperature resistance: The demoulding agent of the present invention can still maintain good lubrication performance under high temperature environment and will not decompose or fail due to high temperature. This is crucial for the high temperature molding process of ceramic-based composite pipe fittings. It can ensure that the mold and the pipe are always in a good lubrication state under high temperature conditions, and avoid damage to the pipe due to adhesion to the mold. The high temperature resistant base oil and solid lubricant in the demoulding lubricant can maintain stable performance at high temperatures and will not lose the lubrication effect due to high temperature. At the same time, the presence of antioxidants can also prevent the demoulding lubricant from oxidizing and deteriorating at high temperatures, further improving the high temperature resistance of the demoulding lubricant.

[0031] 4. Environmentally friendly and non-toxic: It does not contain harmful substances, is environmentally friendly, and meets modern environmental protection requirements. During the production process, no substances harmful to the human body and the environment will be produced, which reduces pollution to the environment and conforms to the concept of sustainable development.

[0032] 5. Easy to clean: After demoulding, the release agent can be easily cleaned from the surface of the mold and pipe fittings without any residue, which is convenient for subsequent processing and treatment; it not only saves cleaning time and cost, but also avoids the influence of residual lubricant on subsequent processes, thereby improving production efficiency and product quality. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention discloses a demoulding agent for preparing thin-walled ceramic-based pipe fittings, which solves the problems of adhesion connection between ceramic-based composite material pipe fittings and shaping pretightening devices, increased friction resistance, difficulty in demoulding, pipe damage, etc. in the process of preparing thin-walled ceramic-based pipe fittings PIP deposition, designs a demoulding agent for quickly and easily demoulding shaping pretightening devices, improves demoulding effect, prevents adhesion between molds and pipes, and solves the problems of pipe damage, difficulty in demoulding, etc. in the process of PIP deposition processing.

[0035] The synthetic ester base oil used in this embodiment has excellent heat resistance and chemical stability, is not easy to decompose at high temperatures, and can provide continuous lubrication between the mold and the pipe. Its unique molecular structure can form a uniform and tough protective film on the mold surface, effectively blocking the direct contact between the ceramic-based composite material and the mold. It can evenly cover the mold surface, providing good conditions for the molding and demolding of the pipe.

[0036] Based on this, the synthetic ester base oil used in this embodiment is pentaerythritol oleate, which is a high temperature resistant, low volatility synthetic oil with good lubrication properties and thermal stability. It can maintain a stable lubrication film under high temperature environment, effectively reduce the friction between the mold and the pipe fittings without introducing impurities, and has good fluidity at different temperatures, adapting to the complex molding environment of ceramic-based composite pipe fittings.

[0037] Pentaerythritol oleate is a base oil of neopentyl polyol esters. Pentaerythritol oleate not only meets the requirements of being renewable and biodegradable, but also has the superior properties of petroleum-based lubricants: ① It has a wide liquid range, a high viscosity index, excellent viscosity performance and low temperature performance; ② Good thermal stability; ③ The molecular structure contains highly active ester groups, which are easily adsorbed on the metal surface to form a firm lubricating oil film and have good friction and lubrication properties. Pentaerythritol oleate is a lubricating oil base oil with excellent performance, which has the advantages of good high temperature resistance, good viscosity-temperature performance, non-toxicity, biodegradability and good lubrication performance. It is widely used in aviation and high-temperature metal processing.

[0038] The phenolic antioxidant is 2,6-di-tert-butyl-α-dimethylamino-p-cresol, which can prevent the mold release lubricant from oxidation and deterioration at high temperatures, thereby extending its service life. It can effectively capture free radicals and prevent the oxidation reaction from proceeding. This antioxidant can play a stable role in high temperature environments, protecting the mold release lubricant from oxidation, thereby ensuring its long-term lubrication effect.

[0039] Petroleum sulfonate rust inhibitor is one of the petroleum calcium sulfonate and petroleum barium sulfonate, which can prevent the mold from rusting and ensure the surface quality of the mold. It can form a protective film on the surface of the mold to prevent erosion by moisture and oxygen. This protective film can not only prevent the mold from rusting, but also improve the wear resistance of the mold and extend the service life of the mold.

[0040] Sulfur-phosphorus type extreme pressure agent is sulfidized isobutylene, which can provide good lubrication performance under high pressure and prevent adhesive wear between the mold and the pipe. Under high pressure and high friction conditions, it can react chemically with the metal surface to form a high-strength lubricating film, which improves the lubricant's load-bearing capacity. This extreme pressure agent can withstand huge pressure during the pipe forming process, ensuring that the mold and the pipe are always in a good lubrication state, and preventing the pipe from being damaged due to adhesion to the mold.

[0041] Molybdenum disulfide powder has good self-lubricating properties and can form a uniform lubricating film between the mold and the pipe, further reducing friction and improving demoulding effect. It also has good high temperature resistance and chemical stability, and can maintain stable lubrication performance even in high temperature, high pressure and high friction environments. The high temperature resistance of molybdenum disulfide enables it to play a role in the high temperature molding process of ceramic matrix composite pipes, ensuring that the demoulding lubricant can still maintain good lubrication effect at high temperatures.

[0042] Graphite powder has a layered structure and can easily form a lubricating film with a low friction coefficient on the metal surface during the friction process. The layered structure of graphite enables it to slide between the mold and the pipe, reducing friction and making it easier to demold the pipe. In the preparation and processing of ceramic-based composite pipes, the large amount of C in graphite can enhance the uniformity of the components of the ceramic-based composite.

[0043] In a method for preparing a mold release agent for preparing thin-walled ceramic-based pipe fittings, first, a synthetic ester base oil is heated to a certain temperature, usually between 50° C. and 70° C. This temperature range can enhance the fluidity of the synthetic ester base oil and facilitate the subsequent addition and mixing of additives and solid lubricants.

[0044] Then, phenolic antioxidant, petroleum sulfonate rust inhibitor and sulfur-phosphorus extreme pressure agent are added to the synthetic ester base oil in a certain proportion. The specific proportion can be adjusted according to actual needs. The amount of antioxidant added is 0.5-1% of the total weight of the lubricant, the amount of rust inhibitor added is 1-2% of the total weight of the lubricant, and the amount of extreme pressure agent added is 2-3% of the total weight of the lubricant. After adding the additives, use a stirrer to stir, the stirring speed is controlled between 500r / min and 800r / min, and the stirring time is 30min to 60min to ensure that the additives are fully dissolved in the synthetic ester base oil to form a uniform mixed liquid.

[0045] Next, molybdenum disulfide solid lubricant and graphite powder are slowly added to the mixed liquid in sequence. The amount of molybdenum disulfide added is generally 3-5% of the total weight of the lubricant, and the amount of graphite powder added is generally 2-5% of the total weight of the lubricant. During the addition process, stirring should be continued, and the stirring speed can be appropriately increased to 800r / min to 1000r / min, and the stirring time is 60min to 90min, so that molybdenum disulfide and graphite powder are fully dispersed in the synthetic ester base oil to form a stable lubricant system.

[0046] Finally, the prepared lubricant is filtered to remove impurities and particles. The filtration can be done in multiple stages, such as filtering through a coarse filter first and then filtering through a fine filter to ensure the purity of the lubricant. The filtered lubricant is packaged and stored in a cool, dry place for future use.

[0047] The mold release agent prepared by the present invention for preparing thin-walled ceramic-based pipe fittings is sprayed or brushed onto the surface of the core mold, can effectively adhere to the surface of the core mold, and at the same time adhere to form a dense lubricating isolation layer, so as to smoothly separate the ceramic-based composite material from the core mold without adhesion. The composition is environmentally friendly and non-toxic, easy to clean, and the preparation method is simple. It can meet the use in high temperature and high pressure environments, especially it can achieve lubrication protection of the ceramic-based composite material and the metal-based core mold, and has excellent chemical stability.

[0048] Example 1

[0049] The present embodiment is a mold release agent for preparing thin-walled ceramic-based pipe fittings, and the composition and weight percentage of the material are:

[0050] 2,6-di-tert-butyl-α-dimethylamino-p-cresol 0.5%, calcium petroleum sulfonate 1%, sulfided isobutylene 2%, molybdenum disulfide powder 3%, graphite powder 2%, pentaerythritol oleate 91.5%.

[0051] A method for preparing a release agent for preparing thin-walled ceramic-based pipe fittings, the components and weight percentages of the materials used, comprising the following steps:

[0052] Step 1, heating pentaerythritol oleate 91.5% to 50° C. to 70° C.;

[0053] Step 2, 0.5% of 2,6-di-tert-butyl-α-dimethylamino-p-cresol, 1% of calcium petroleum sulfonate, and 2% of isobutylene sulfide are sequentially added to 91.5% of heated pentaerythritol oleate, and stirred at a speed of 500 r / min for 30 minutes to obtain a mixed solution A;

[0054] Step 3, 3% of molybdenum disulfide powder and 2% of graphite powder are added to the mixed solution A in sequence, and stirred at a speed of 800 r / min for 60 min to obtain a mixed solution B;

[0055] Step 4: Pass the mixed solution B through a 1000-mesh sieve and an 800-mesh sieve in sequence, and cool to room temperature to obtain a release agent for preparing thin-walled ceramic-based pipe fittings.

[0056] In this embodiment, a release agent for preparing thin-walled ceramic-based pipe fittings is applied to a mold for preparing thin-walled ceramic-based pipe fittings, and the application thickness is 2 mm.

[0057] Example 2

[0058] The present embodiment is a release agent for preparing a thin-walled ceramic-based pipe fitting, and the composition and weight percentage of the material are:

[0059] 2,6-di-tert-butyl-α-dimethylamino-p-cresol 0.7%, calcium petroleum sulfonate 1.5%, isobutylene sulfide 2.5%, molybdenum disulfide powder 4%, graphite powder 3.5%, pentaerythritol oleate 87.8%.

[0060] A method for preparing a release agent for preparing thin-walled ceramic-based pipe fittings, the components and weight percentages of the materials used, comprising the following steps:

[0061] Step 1, heating 87.8% of pentaerythritol oleate to 50° C. to 70° C.;

[0062] Step 2, 0.7% of 2,6-di-tert-butyl-α-dimethylamino-p-cresol, 1.5% of calcium petroleum sulfonate, and 2.5% of isobutylene sulfide are sequentially added to 87.8% of heated pentaerythritol oleate, and stirred at a speed of 600 r / min for 40 minutes to obtain a mixed solution A;

[0063] Step 3, 4% of molybdenum disulfide powder and 3.5% of graphite powder are added to the mixed solution A in sequence, and stirred at a speed of 900 r / min for 80 min to obtain a mixed solution B;

[0064] Step 4: Pass the mixed solution B through a 1000-mesh sieve and an 800-mesh sieve in sequence, and cool to room temperature to obtain a release agent for preparing thin-walled ceramic-based pipe fittings.

[0065] In this embodiment, a release agent for preparing thin-walled ceramic-based pipe fittings is applied to a mold for preparing thin-walled ceramic-based pipe fittings, and the application thickness is 2 mm.

[0066] Example 3

[0067] The present embodiment is a release agent for preparing a thin-walled ceramic-based pipe fitting, and the composition and weight percentage of the material are:

[0068] 2,6-di-tert-butyl-α-dimethylamino-p-cresol 1%, calcium petroleum sulfonate 2%, sulfided isobutylene 3%, molybdenum disulfide powder 5%, graphite powder 5%, pentaerythritol oleate 84%.

[0069] A method for preparing a release agent for preparing thin-walled ceramic-based pipe fittings, the components and weight percentages of the materials used, comprising the following steps:

[0070] Step 1, heating pentaerythritol oleate 84% to 50° C. to 70° C.;

[0071] Step 2, 1% of 2,6-di-tert-butyl-α-dimethylamino-p-cresol, 2% of calcium petroleum sulfonate, and 3% of isobutylene sulfide are sequentially added into 84% of heated pentaerythritol oleate, and stirred at a speed of 800 r / min for 60 min to obtain a mixed solution A;

[0072] Step 3, 5% of molybdenum disulfide powder and 5% of graphite powder are added to the mixed solution A in sequence, and stirred at a speed of 1000 r / min for 90 min to obtain a mixed solution B;

[0073] Step 4: Pass the mixed solution B through a 1000-mesh sieve and an 800-mesh sieve in sequence, and cool to room temperature to obtain a release agent for preparing thin-walled ceramic-based pipe fittings.

[0074] In this embodiment, a release agent for preparing thin-walled ceramic-based pipe fittings is applied to a mold for preparing thin-walled ceramic-based pipe fittings, and the application thickness is 0.5 mm.

[0075] By setting the proportion of each component in the above-mentioned embodiments 1, 2, and 3, the parameters such as the base oil heating temperature, stirring speed and time are precisely controlled to ensure that the components can be fully mixed and dissolved, and antioxidants, rust inhibitors, extreme pressure agents and solid lubricants are added in a specific order so that the components can better interact with each other, exert the best performance, and form a uniform and stable release agent.

[0076] The release agent prepared in Example 2 is used to prepare thin-walled ceramic-based pipe fittings, specifically:

[0077] Check whether all parts of the shaping and pre-tightening device are intact and ensure that they are placed stably on the workbench. Clean and dry the inner and outer surfaces of the thin-walled ceramic matrix composite pipe to be processed and deposited; the outer surface is the deposition surface of the thin-walled ceramic matrix composite pipe to be processed.

[0078] Using the center line of the core mold device as a reference, first clean the surface of the core mold device to remove oil and impurities. Use organic solvents or special cleaning agents to clean and ensure that the mold surface is clean and dry.

[0079] The release agent prepared in Example 2 is evenly applied to the surface of the core mold device mold to form a thin lubricating film. The application can be carried out by spraying, brushing or dipping to ensure that the lubricating film evenly covers the mold surface.

[0080] After the release agent is dried, the pipe can be formed and demoulded. The thin-walled ceramic-based composite pipe is slowly inserted, and the core mold device fixes the radial position of the thin-walled ceramic-based composite pipe to ensure the inner diameter size accuracy and straightness of the thin-walled ceramic-based composite pipe.

[0081] By adjusting the tightening degree of the pre-tightening device, the size of the pre-tightening force can be controlled to adapt to pipes of different sizes and shapes. During the molding process, attention should be paid to controlling parameters such as temperature and pressure to ensure the quality of the pipes.

[0082] The thin-walled ceramic-based pipes are prepared by multiple rounds of PIP deposition, high-temperature cracking, and repeated dipping. The release agent prepared in this embodiment can assist in the preparation of thin-walled ceramic-based pipes to improve the industrial efficiency of production and preparation and improve the deposition utilization rate.

[0083] Among them, the PIP deposition accuracy is controlled to be 50±10h, the deposition temperature is 850-1000℃, and the reaction gases are trichloromethylsilane, argon, and hydrogen. The preferred reference gas flow rates are: bubbling hydrogen 1.7L / min, diluted hydrogen 1.0L / min, diluted argon 1.7L / min, and silane drop (9-15cm).

[0084] When demoulding, be careful to avoid damaging the pipe fittings.

[0085] The inner diameter of the prepared thin-walled ceramic-based pipe is 7.9mm, the outer diameter is 9.5mm, the length is 1m, and the material is SiC; there is no damage to the surface of the prepared thin-walled ceramic-based pipe, and the mechanical properties of the pipe are tested. The results show that the tensile strength of the pipe is 500MPa, the bending strength is 700MPa, and the fracture toughness is 18MPa·m1 / 2. The prepared pipe has excellent mechanical properties.

[0086] The above description is only a specific embodiment of the present invention, and a comparison of the effects of the specific embodiments and the related comparative examples, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A release agent for preparing thin-walled ceramic-based pipe fittings, characterized in that: The composition and weight percentage of the materials are: 0.5-1% phenol antioxidant, 1-2% petroleum sulfonate rust inhibitor, 2-3% sulfur-phosphorus extreme pressure agent, 3-5% molybdenum disulfide powder, 2-5% graphite powder, and the remaining ingredients are synthetic ester base oils. The sum of the weight percentages of the above materials is 100%.

2. A release agent for preparing thin-walled ceramic-based pipe fittings according to claim 1, characterized in that: The phenolic antioxidant is 2,6-di-tert-butyl-α-dimethylamino-p-cresol.

3. A release agent for preparing thin-walled ceramic-based pipe fittings according to claim 1, characterized in that: The petroleum sulfonate rust inhibitor is one of calcium petroleum sulfonate and barium petroleum sulfonate.

4. A release agent for preparing thin-walled ceramic-based pipe fittings according to claim 1, characterized in that: The sulfur-phosphorus type extreme pressure agent is sulfided isobutylene.

5. A release agent for preparing thin-walled ceramic-based pipe fittings according to claim 1, characterized in that: The synthetic ester base oil is pentaerythritol oleate.

6. A method for preparing a release agent for preparing thin-walled ceramic-based pipe fittings, characterized in that: Using the components and weight percentages of the material described in any one of claims 1 to 5, comprising the following steps: Step 1, heating the synthetic ester base oil to 50°C to 70°C; Step 2, 0.5-1% of a phenolic antioxidant, 1-2% of a petroleum sulfonate rust inhibitor, and 2-3% of a sulfur-phosphorus extreme pressure agent are sequentially added to the heated synthetic ester base oil in step 1, and stirred to obtain a mixed solution A; Step 3, 3-5% of molybdenum disulfide powder and 2-5% of graphite powder are added to the mixed solution A in sequence, and stirred to obtain a mixed solution B; Step 4: Filter the mixed solution B and cool it to room temperature to obtain a release agent for preparing thin-walled ceramic-based pipe fittings.

7. A method for preparing a release agent for preparing a thin-walled ceramic-based pipe according to claim 6, characterized in that: The stirring in step 2 is specifically: 500r / min to 800r / min, and the stirring time is 30min to 60min; The stirring in step 3 is specifically: 800r / min~1000r / min, and the stirring time is 60min~90min.

8. A method for preparing a release agent for preparing a thin-walled ceramic-based pipe according to claim 5, characterized in that: In step 4, the filtering is specifically as follows: Filter out particles with a particle size of not less than 1000 mesh through a coarse filter; Then use a fine filter to filter out particles with a particle size of not less than 800 mesh.

9. The use of a release agent for preparing thin-walled ceramic-based pipes according to any one of claims 1 to 4, characterized in that: Used to apply on the core mold for preparing thin-walled ceramic-based pipe fittings.

10. The use of a release agent for preparing thin-walled ceramic-based pipe fittings according to claim 9, characterized in that: The coating thickness is 0.5mm-2mm.