A special sealing wax and its application in high-end precision casting

Abstract

The present invention relates to the field of precision casting technology, in particular to the field of IPC B22C7, and more specifically to a special immersion sealing wax and its application in high-end precision casting. The immersion sealing wax prepared by the present invention can quickly solidify on the surface of the runner mold model, and form a layer of wax film with uniform thickness, smooth and flat, no flow marks or sagging, good adhesion and fineness on its surface, and this layer of wax mold can fill the defects of the runner surface, making its surface smooth and flat without flow marks. At the same time, the wax film has a low softening point, moderate hardness, and is well combined with the main wax mold. It can be quickly melted in the demoulding stage, and assists the runner wax to quickly and preferentially remove from the mold shell, which can further reduce the residence time of the model wax in the mold shell, thereby reducing the risk of the mold shell being burst, and thus improving the casting yield. The special immersion sealing wax prepared by the present invention is suitable for use in high-end precision casting fields such as the aerospace industry, ship turbines, health care, and civil hardware.

Description

Technical Field

[0001] The present invention relates to the field of precision casting technology, in particular to the field of IPC B22C7, and more specifically to a special impregnation wax and application thereof in high-end precision casting. Background Art

[0002] With the growing demands of China's high-end manufacturing industries, such as aerospace and ship turbines, investment casting technology is constantly evolving and innovating. However, due to the complexity of the investment casting process, technical bottlenecks arise at each step, resulting in a low yield rate for the final high-end castings and difficulty ensuring profitability in large-scale production. This is one of the bottlenecks hindering the development of China's high-end manufacturing.

[0003] Wax pattern making, mold assembly, shell formation, and demolding are the initial steps in investment casting and are also key to the quality of the finished casting. Improving the yield rate of this step is crucial.

[0004] In the prior art, the patent document with authorization announcement number CN104841880B discloses a medium-temperature modulated wax for precision casting and a preparation method thereof. By melt-mixing raw materials such as microcrystalline wax, lignite wax, rosin resin, ethylene-vinyl acetate copolymer, and pure monomer resin, the obtained modulated wax has high strength and low grayness, which can improve production efficiency. However, its softening point is relatively high. If it is used as an immersion wax, it cannot quickly assist the runner wax to quickly separate from the membrane shell, increasing the risk of the membrane shell being burst.

[0005] The patent document with authorization announcement number CN105175851B discloses a precision casting wax, its preparation method and use. The precision casting wax prepared by mixing raw materials such as PE wax, polystyrene, stearic acid, and white carbon black is used in CAD precision processing, which can improve remelting and wire drawing phenomena and improve the quality of the wax block. However, its softening point is relatively high. It is used in high-end precision casting fields such as aerospace, ship turbines, health care, and civil hardware. It cannot melt quickly during the demolding stage, and the auxiliary runner wax cannot be quickly and preferentially removed from the mold shell, increasing the risk of the membrane shell being ruptured.

[0006] Therefore, it is necessary to develop a special impregnation wax with a low softening point and moderate hardness, which not only has good bonding with the main wax mold, but also has a smooth and flat surface when bonded, without bubbles and flow marks, and does not produce sagging. It can also melt quickly during the demolding stage, assisting the runner wax to quickly and preferentially remove from the mold shell, thereby improving the yield rate in the process of making wax molds, assembling molds, making shells, and demolding. Summary of the Invention

[0007] In order to solve the above problems, the first aspect of the present invention provides a special sealing wax. The raw materials for preparation include, by weight, 5-50 parts of wax, 25-45 parts of viscosity regulator, 25-60 parts of lubricant, 0.1-5 parts of surfactant, 0.5-5 parts of auxiliary agent, 0.01-1 parts of antioxidant, and 0-1 parts of pigment.

[0008] Preferably, the raw materials for preparing the special sealing wax include, by weight: 15-30 parts of wax, 25-40 parts of viscosity regulator, 35-50 parts of lubricant, 0.1-3 parts of surfactant, 0.5-3 parts of auxiliary agent, 0.01-0.5 parts of antioxidant, and 0-0.5 parts of pigment.

[0009] Preferably, the kinematic viscosity of the wax at 100°C is 1-15 mm 2 / S, melting point is 40-80℃.

[0010] Preferably, the wax is one or more of paraffin wax, microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, and polypropylene wax; more preferably, it is paraffin wax and microcrystalline wax.

[0011] Preferably, the weight ratio of the paraffin wax to the microcrystalline wax is 1:(1-2); more preferably, it is 2:3.

[0012] In some preferred embodiments, the wax is purchased from Sinopec.

[0013] The applicant found that the kinematic viscosity at 100°C was 1-15 mm 2 / S, wax with a melting point of 40-80°C is used as the raw material for special sealing wax, which not only makes the prepared sealing wax have a low softening point and suitable fluidity, but also can prevent the surface of the molding material from sagging, dripping, bubbling and flow marks when used, and can also fill the defects at the injection molding interface, which is suitable for application in the field of high-end precision casting. However, although paraffin wax is cheap and has relatively stable chemical properties, it is brittle and easily breaks or even shatters when subjected to force, which will cause the sealing wax to crack when used. The applicant unexpectedly discovered that the selection of a certain amount of microcrystalline wax and paraffin wax can adjust the softening point and fluidity of the sealing wax while making it less likely to break in the subsequent process. This may be because microcrystalline wax has good flexibility, and adding it to the system can improve the shaping of paraffin wax, making it less likely to break after being subjected to force. However, microcrystalline wax is not only expensive, which will increase costs, but also has poor fluidity and cannot fill defects on the surface of the wax film. The applicant unexpectedly discovered that when the weight ratio of paraffin wax to microcrystalline wax is 1:(1-2), the softening point and fluidity of the sealing wax can be adjusted so that it will not produce sagging or flow marks on the surface of the modeling material during application, and it will not easily break during subsequent process operations. It also has a high bonding strength with the wax mold, is relatively low in cost, and is suitable for large-scale industrial production.

[0014] Preferably, the viscosity modifier is one or more of polyterpene resin, hydrocarbon resin, rosin resin, phenolic resin, xylene resin, and terpene phenolic resin; more preferably, it is hydrocarbon resin.

[0015] Preferably, the hydrocarbon resin is one or more of alicyclic hydrocarbon resin (DCPD), aliphatic hydrocarbon resin (C5), aromatic hydrocarbon resin (C9), C9 hydrogenated resin, and C5 hydrogenated resin; more preferably, it is C5 hydrogenated resin.

[0016] Preferably, the softening point of the C5 hydrogenated resin is 90-110°C, and the melt viscosity at 190°C is ≤300mPa·s; further preferably, the softening point of the C5 hydrogenated resin is 95-105°C, and the melt viscosity is ≤250mPa·s.

[0017] In some preferred embodiments, the viscosity regulator is purchased from LH100-0 produced by PetroChina Lanzhou Petrochemical Company.

[0018] Preferably, the lubricant is one or more of trihydroxy ester lubricants, fatty acid amide lubricants, oleate lubricants, stearic acid lubricants, and polymer lubricants; more preferably, it is a stearic acid lubricant and a fatty acid amide lubricant.

[0019] Preferably, the weight ratio of the stearic acid lubricant to the fatty acid amide lubricant is (25-45): (1-3).

[0020] Preferably, the stearic acid lubricant is selected from one or more of stearic acid, calcium stearate, zinc stearate, magnesium stearate, and barium stearate; more preferably, it is stearic acid.

[0021] Preferably, the fatty acid amide lubricant is selected from one or more of oleamide, erucamide, n-butyl stearate, trihydroxystearate, and polyamide wax; more preferably, it is polyamide wax.

[0022] Preferably, the polyamide wax has a melting point of 60-75° C. and a particle size of 100-300 mesh; further preferably, the polyamide wax has a melting point of 65-70° C. and a particle size of 125-200 mesh.

[0023] In some preferred embodiments, the fatty acid amide lubricant is purchased from WAX 2110 produced by Changzhou Kesa Chenggong Plastic Materials.

[0024] The applicant unexpectedly discovered that using a stearic acid lubricant and a fatty acid amide lubricant in a weight ratio of (25-45): (1-3) as lubricants can simultaneously lower the softening point and achieve a moderate hardness for the immersion wax. This is likely due to the combined effect of the two lubricants, which not only adjusts the softening point and hardness of the immersion wax but also increases its fluidity. This allows it to form a uniform layer of wax on the sprue mold surface that is free of sagging and flow marks. Furthermore, it dissolves quickly during demolding, reducing the residence time of the model wax in the mold shell.

[0025] Preferably, the surfactant is one or more of an organosilicon surfactant, an anionic surfactant, and a nonionic surfactant; more preferably, it is a nonionic surfactant.

[0026] Preferably, the nonionic surfactant is selected from one or more of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene alkylamine, fatty acid polyoxyethylene ester, polyoxyethylene alkylamide, sorbitan fatty acid ester series surfactants, and polysorbate series surfactants; further preferably, it is a sorbitan fatty acid ester series surfactant.

[0027] Preferably, the hydroxyl value of the sorbitan fatty acid ester series surfactant is 50-95 mgKOH / g, and the HLB value is 1-4; further preferably, the hydroxyl value of the sorbitan fatty acid ester series surfactant is 60-80 mgKOH / g, and the HLB value is 1.8.

[0028] In some preferred embodiments, the surfactant is purchased from S-85 produced by Hai'an Petrochemical Plant in Jiangsu Province.

[0029] The applicant discovered that using a C5 hydrogenated resin with a softening point of 90-110°C and a melt viscosity of ≤300 mPa·s at 190°C as a viscosity modifier can not only adjust the softening point and fluidity of the impregnation wax, but also enhance its bond strength to the wax mold. However, this improvement is limited. The applicant unexpectedly discovered that adding a sorbitan fatty acid ester-based surfactant with a hydroxyl value of 50-95 mgKOH / g and an HLB value of 1-4 to the system can further enhance the bond strength between the impregnation wax and the substrate. This is likely due to the fact that the addition of this specific sorbitan fatty acid ester-based surfactant improves the wettability of the impregnation wax and the substrate, thereby increasing the contact area between the impregnation wax and the substrate, and thus improving the bond strength between the impregnation wax and the wax mold. Furthermore, the lack of unsaturated hydrogen bonds in the C5 hydrogenated resin improves the melt stability of the impregnation wax.

[0030] Preferably, the auxiliary agent is a nucleating agent.

[0031] Preferably, the nucleating agent is selected from one or more of sodium benzoate, polyvinyl cyclosilane, 1,3:2,4-bis(3,4-dimethyl)benzylidene sorbitol acetal, poly 3-methylbutene-1, polybutylene terephthalate, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, and fatty carboxylic acid metal compound; further preferably, it is ethylene-methacrylic acid copolymer.

[0032] Preferably, the melt flow rate of the ethylene-methacrylic acid copolymer measured by ASTM D1238 is 1.0-5.0 g / min, and the melting point is 90-110°C; further preferably, the melt flow rate of the ethylene-methacrylic acid copolymer measured by ASTM D1238 is 3.0-5.0 g / min, and the melting point is 95-105°C.

[0033] In some preferred embodiments, the nucleating agent is purchased from Surlyn 1652SB produced by DuPont in the United States.

[0034] In some preferred embodiments, the use of ethylene-methacrylic acid copolymer as a nucleating agent not only enables the prepared wax to crystallize quickly on the mold surface during application, forming a smooth, flat, and non-sagging wax layer, but also speeds up demolding, reducing the risk of mold shell rupture and thus increasing product yield. Furthermore, the ethylene-methacrylic acid copolymer promotes the migration of fatty acid amide lubricants to the wax surface during the solidification process, thereby increasing the wax's surface smoothness and density, ensuring smooth and streaky application of the wax.

[0035] Preferably, the antioxidant is one or more of triethylene glycol bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 2,2-oxalamido-bis[ethyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)] propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, and N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide); further preferably, it is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

[0036] In some preferred embodiments, the antioxidant is purchased from the antioxidant produced by Tianjin Li'anlong New Materials Co., Ltd. 1076.

[0037] Preferably, the pigment is an oil-soluble dye; the pigment can withstand high temperatures of 200°C.

[0038] In some preferred embodiments, the pigment is purchased from Guangzhou Deseli Pigment Co., Ltd.

[0039] The preparation steps of the special sealing wax are as follows: wax, viscosity modifier, lubricant, surfactant, auxiliary agent, anti-aging agent and pigment are added into a heating kettle according to weight ratio and stirred evenly to obtain the special sealing wax.

[0040] Preferably, the preparation steps of the special sealing wax are as follows:

[0041] S1. Add wax and stearic acid lubricant into a heating kettle, raise the temperature to 80-100°C, and stir until they are completely melted to obtain mixture 1;

[0042] S2, adding an antioxidant to the mixture 1 and heating it to 110-140° C. with stirring to obtain a mixture 2;

[0043] S3, adding a viscosity modifier to the mixture 2 obtained in step S2, controlling the temperature to be less than 130° C., continuing stirring until the mixture is completely melted, and then keeping the temperature for 10-40 minutes to obtain a mixture 3;

[0044] S4. Add the auxiliary agent, surfactant, and fatty acid amide lubricant to the mixture three obtained in step S3, and control the temperature to 110-140° C., keep warm for 0.5-2 hours, add the pigment, continue stirring for 5-30 minutes, and cool to 15-25° C. to obtain the product.

[0045] The second aspect of the present invention provides the application of the special sealing wax in high-end precision casting, which can be applied to high-end precision casting fields such as aerospace industry, ship turbines, health care, and civil hardware.

[0046] The special sealing wax is particularly suitable for the preparation of turbine blades in the aerospace industry and the field of ship turbines, the preparation of artificial joints in the field of health care, and the preparation of auto parts in the field of civil hardware.

[0047] Beneficial effects:

[0048] 1. By selecting a kinematic viscosity of 1-15mm at 100℃ 2 / S, wax with a melting point of 40-80℃ is used as the raw material of special sealing wax. It not only makes the prepared sealing wax have a low softening point and suitable fluidity, but also can prevent the surface of the molding material from sagging, dripping, bubbling and flow marks when used, and can also fill the defects at the injection molding interface, which is suitable for application in the field of high-end precision casting.

[0049] 2. By selecting paraffin wax and microcrystalline wax in a weight ratio of 1: (1-2), the softening point and fluidity of the sealing wax can be adjusted so that it will not produce sagging or flow marks on the surface of the modeling material during application, and will not be easily broken during subsequent operations. It also has a high bonding strength with the wax model, low cost, and is suitable for large-scale industrial production.

[0050] 3. By selecting a stearic acid lubricant and a fatty acid amide lubricant in a weight ratio of (25-45): (1-3) as lubricants, the softening point can be lowered while the hardness of the sealing wax is made moderate.

[0051] 4. By selecting C5 hydrogenated resin with a softening point of 90-110°C and a melt viscosity of ≤300mPa·s at 190°C as a viscosity regulator, the softening point and fluidity of the sealing wax can be adjusted while also increasing the bonding strength with the wax pattern.

[0052] 5. By selecting ethylene-methacrylic acid copolymer as a nucleating agent, not only can the prepared sealing wax be quickly crystallized on the surface of the model during application, forming a smooth and flat wax mold without sagging, but also the demolding time is fast, reducing the risk of the mold shell being ruptured, thereby increasing the yield rate.

[0053] 6. The present invention uses the immersion wax prepared by compounding wax, lubricant, viscosity regulator and other raw materials in high-end precision casting. It can quickly solidify on the surface of the runner mold model and form a layer of wax film with uniform thickness, smooth and flat surface, no flow marks or sagging, and good adhesion on its surface. This layer of wax mold can fill the surface of the runner surface, the interface of the mold assembly, and other small cracks, pinholes and other defects on the wax mold surface, making its surface smooth and flat without flow marks. At the same time, the wax film has a low softening point, moderate hardness, and good combination with the main wax mold. It can be quickly melted during the demoulding stage, and the runner wax can be quickly and preferentially removed from the mold shell. This can further reduce the residence time of the model wax in the mold shell, thereby reducing the risk of the mold shell being ruptured, and thus improving the yield rate of the final casting.

[0054] 7. The special sealing wax prepared by the present invention can be used in high-end precision casting fields such as aerospace industry, ship turbines, health care, and civil hardware. It is particularly suitable for the preparation of turbine blades in the aerospace industry and ship turbine fields, the preparation of artificial joints in the health care field, and the preparation of auto parts in the civil hardware field. DETAILED DESCRIPTION

[0055] Example

[0056] Example 1

[0057] Example 1 provides a special sealing wax. The raw materials for preparation include, by weight, 25 parts of wax, 30 parts of viscosity modifier, 40 parts of lubricant, 0.5 parts of surfactant, 1 part of auxiliary agent, 0.03 parts of antioxidant, and 0.1 parts of pigment.

[0058] The kinematic viscosity of the wax at 100°C is 1-15 mm 2 / S, melting point is 40-80℃.

[0059] The waxes are paraffin wax and microcrystalline wax.

[0060] The weight ratio of the paraffin wax to the microcrystalline wax is 2:3.

[0061] The wax was purchased from Sinopec.

[0062] The viscosity modifier is hydrocarbon resin.

[0063] The hydrocarbon resin is C5 hydrogenated resin.

[0064] The softening point of the C5 hydrogenated resin is 95-105° C., and the melt viscosity is ≤250 mPa·s.

[0065] The viscosity regulator was purchased from LH100-0 produced by PetroChina Lanzhou Petrochemical Company.

[0066] The lubricant is a stearic acid lubricant and a fatty acid amide lubricant.

[0067] The weight ratio of the stearic acid lubricant to the fatty acid amide lubricant is 20:1.

[0068] The stearic acid lubricant is stearic acid.

[0069] The fatty acid amide lubricant is polyamide wax.

[0070] The polyamide wax has a melting point of 65-70° C. and a particle size of 125-200 meshes.

[0071] The fatty acid amide lubricant was purchased from WAX 2110 produced by Changzhou Kesa Chenggong Plastic Materials.

[0072] The surfactant is a nonionic surfactant.

[0073] The nonionic surfactant is a sorbitan fatty acid ester series surfactant.

[0074] The sorbitan fatty acid ester series surfactant has a hydroxyl value of 60-80 mgKOH / g and an HLB value of 1.8.

[0075] In some preferred embodiments, the surfactant is purchased from S-85 produced by Hai'an Petrochemical Plant in Jiangsu Province.

[0076] The auxiliary agent is a nucleating agent.

[0077] The nucleating agent is ethylene-methacrylic acid copolymer.

[0078] The melt flow rate of the ethylene-methacrylic acid copolymer measured by ASTM D1238 is 3.0-5.0 g / min, and the melting point is 95-105° C.

[0079] The nucleating agent was purchased from Surlyn 1652SB produced by DuPont in the United States.

[0080] The antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

[0081] The antioxidant was purchased from Tianjin Li'anlong New Materials Co., Ltd. 1076.

[0082] The pigment is an oil-soluble dye and can withstand high temperatures of 200°C.

[0083] The pigments were purchased from Guangzhou Deseli Pigment Co., Ltd.

[0084] The preparation steps of the special sealing wax are as follows: wax, viscosity modifier, lubricant, surfactant, auxiliary agent, anti-aging agent and pigment are added into a heating kettle according to weight ratio and stirred evenly to obtain the special sealing wax.

[0085] Preferably, the preparation steps of the special sealing wax are as follows:

[0086] S1. Add wax and stearic acid lubricant into a heating kettle, heat to 90°C and stir until they are completely melted to obtain mixture 1;

[0087] S2, adding an antioxidant to the mixture 1 and heating it to 130° C. with stirring to obtain a mixture 2;

[0088] S3, adding a viscosity modifier to the mixture 2 obtained in step S2, controlling the temperature to be less than 125° C., continuing stirring until the mixture is completely melted, and then keeping the temperature for 30 minutes to obtain a mixture 3;

[0089] S4. Add the auxiliary agent, surfactant, and fatty acid amide lubricant to the mixture three obtained in step S3, and control the temperature to 125° C. After keeping warm for 1 hour, add the pigment, continue stirring for 20 minutes, and cool to 20° C. to obtain the product.

[0090] The second aspect of the present invention provides the use of the special sealing wax in high-end precision casting, which can be applied to the preparation of turbine blades in the aerospace industry and ship turbine field.

[0091] Example 2

[0092] Example 2 provides a special sealing wax, and the specific implementation method is the same as that of Example 1, except that the weight ratio of the paraffin wax to the microcrystalline wax is 1:4.

[0093] Example 3

[0094] Example 3 provides a special impregnation wax, and the specific implementation method is the same as that of Example 1, except that the weight ratio of the paraffin wax to the microcrystalline wax is 3:2.

[0095] Example 4

[0096] Example 4 provides a special impregnation wax, and the specific implementation method is the same as that of Example 1, except that the tackifying resin is an aromatic hydrocarbon resin.

[0097] The aromatic petroleum resin was purchased from C9 petroleum resin produced by Zhejiang Henghe Petrochemical Group Co., Ltd.

[0098] Example 5

[0099] Example 5 provides a special impregnation wax, and the specific implementation method is the same as that of Example 1, except that the weight ratio of the stearic acid lubricant to the fatty acid amide lubricant is 7:1.

[0100] Example 6

[0101] Example 6 provides a special sealing wax, and the specific implementation method is the same as Example 1, except that: in parts by weight, the preparation raw materials include: 25 parts of wax, 30 parts of viscosity regulator, 40 parts of lubricant, 0.5 parts of surfactant, 0.03 parts of antioxidant, and 0.1 parts of pigment.

[0102] Example 7

[0103] Example 7 provides a special sealing wax, and the specific implementation method is the same as Example 1, except that: in parts by weight, the preparation raw materials include: 25 parts of wax, 30 parts of viscosity regulator, 40 parts of lubricant, 1 part of auxiliary agent, 0.03 parts of antioxidant, and 0.1 parts of pigment.

[0104] Example 8

[0105] Example 8 provides a special sealing wax, and the specific implementation method is the same as that of Example 1, except that the lubricant is a stearic acid lubricant.

[0106] Performance testing methods

[0107] 1. Global softening point

[0108] The special sealing waxes prepared in Examples 1-8 were tested for their ring and ball softening points using the national standard GB / T 4507-2014 "Ball and Ball Method for Determination of Softening Point of Asphalt". The results are recorded in Table 1.

[0109] 2. Needle penetration

[0110] For the special sealing wax prepared in Examples 1-8, referring to GB / T 14235.5-93, a standard needle of a "penetometer" was inserted into the sample for 5 seconds under a load of 450g at 25°C. The results are recorded in Table 1.

[0111] 3. Number of drops

[0112] For the special sealing wax prepared in Examples 1-8, at 25° C., a glass rod was inserted into the wax liquid to the same depth and then lifted up. The number of drops of wax liquid that fell was recorded in Table 1.

[0113] 4. Melt stability

[0114] The special sealing wax prepared in Examples 1-8 was placed at 100° C. for 2 weeks, and its morphology was compared with that before placement. The results are recorded in Table 1.

[0115] 5. Firmness of bonding with wax model

[0116] The special sealing wax prepared in Examples 1-8 was placed in a wax melting tank maintained at 100°C. A sprue bar with flow lines was immersed in the sprue solution for no more than 1 second, then quickly lifted out and scraped with a tongue depressor to observe the peeling state. The results are recorded in Table 1.

[0117] 6. Wax model appearance yield rate

[0118] The special sealing wax prepared in Examples 1-8 was placed in a wax melting tank maintained at 100°C. A sprue rod with flow marks was immersed in the sprue tank for no more than 1 second, then quickly lifted out and the sprue surface observed. Ten parallel tests were conducted on the special sealing wax prepared in each example. Wax molds were considered qualified if their surface was smooth, delicate, flat, and free of cracks and flow marks. The wax mold appearance yield rate was calculated as the number of qualified times / 10 times 100%.

[0119] Table 1

[0120]

Claims

1. A special sealing wax, characterized in that: The raw materials for preparing the special sealing wax include: 5-50 parts of wax, 25-45 parts of viscosity regulator, 25-60 parts of lubricant, 0.1-5 parts of surfactant, 0.5-5 parts of auxiliary agent, 0.01-1 parts of antioxidant, and 0-1 parts of pigment; The wax is paraffin wax and microcrystalline wax, the weight ratio of paraffin wax to microcrystalline wax is 1:(1-2), and the kinematic viscosity of the wax at 100° C. is 1-15 mm. 2 / S, melting point is 40-80℃; The viscosity modifier is C5 hydrogenated resin, the softening point of C5 hydrogenated resin is 90-110°C, and the melt viscosity at 190°C is ≤300mPa•s; The lubricant is a stearic acid lubricant and a fatty acid amide lubricant, the weight ratio of the stearic acid lubricant to the fatty acid amide lubricant is (25-45): (1-3), the stearic acid lubricant is stearic acid, and the fatty acid amide lubricant is polyamide wax; The surfactant is a nonionic surfactant, a sorbitan fatty acid ester series surfactant, the sorbitan fatty acid ester series surfactant has a hydroxyl value of 50-95 mgKOH / g and an HLB value of 1-4; The auxiliary agent is a nucleating agent ethylene-methacrylic acid copolymer.

2. The special sealing wax according to claim 1, characterized in that: The raw materials for preparing the special sealing wax include, by weight, 15-30 parts of wax, 25-40 parts of viscosity regulator, 35-50 parts of lubricant, 0.1-3 parts of surfactant, 0.5-3 parts of auxiliary agent, 0.01-0.5 parts of antioxidant and 0-0.5 parts of pigment.

3. The special sealing wax according to claim 1, characterized in that: The preparation steps are as follows: adding wax, viscosity regulator, lubricant, surfactant, auxiliary agent, anti-aging agent and pigment into a heating kettle according to weight ratio and stirring evenly to obtain the product.

4. An application of the special sealing wax according to any one of claims 1 to 3 in high-end precision casting, characterized in that: It is used in the fields of aerospace, ship turbines, health care, and high-end precision casting of civil hardware.

5. The application of the special sealing wax in high-end precision casting according to claim 4 is characterized in that: The special sealing wax is suitable for the preparation of turbine blades in the aerospace industry and the field of ship turbines, the preparation of artificial joints in the field of health care, and the preparation of auto parts in the field of civil hardware.

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