Precision casting wax as well as preparation method and application thereof

Abstract

The invention discloses precision casting wax as well as a preparation method and application thereof. The precision casting wax is prepared from the following raw materials in parts by mass: 20 to 30 parts of microcrystalline wax, 5 to 10 parts of paraffin, 10 to 16 parts of lignite wax, 0 to 5 parts of carnauba wax, 7 to 15 parts of Piccotex75 resin, 5 to 12 parts of terpene resin, 5 to 15 parts of rosin glyceride, 2 to 10 parts of ethylene-vinyl acetate, 4 to 8 parts of stearic acid, 3 to 10 parts of D-mannitol, 5 to 10 parts of adipic acid and 0 to 5 parts of polymethyl methacrylate. According to the precision casting wax disclosed by the invention, the performance of a wax mold is improved by compounding multiple fillers, so that the precision casting wax has high bending hardness and surface hardness, relatively low shrinkage rate and good dimensional stability, and can be widely applied to the field of high-precision casting.

Description

Technical Field

[0001] The present invention belongs to the technical field of investment casting wax materials, and specifically relates to a precision casting wax, a preparation method thereof, and an application thereof.

Background Art

[0002] Investment casting is an advanced casting process with a long history that can directly prepare castings. The investment casting technology uses materials that are easy to melt (generally wax materials) to prepare the model of the required casting, and then uses refractory materials to cover the model. After the covered materials are formed, the wax model is removed by heating, and the mold shell prepared with refractory materials is calcined to obtain a mold. Then, the required casting can be obtained by pouring molten metal into the mold.

[0003] Precision casting wax is the basis of investment precision casting, and its quality determines the quality of investment casting castings. However, there are few domestic precision casting wax products, with poor quality and low precision, far from meeting the needs of the domestic precision casting industry. China needs to import a large number of high-quality foreign precision casting wax products, and their price costs have always been high. Therefore, researching and developing high-quality precision casting wax has very important practical significance.

[0004] From the usage purposes of investment casting products, they can be divided into two categories: one is commercial products, and the other is aviation and military products. The former has relatively low requirements for product quality, while the latter has much higher requirements for product quality than the former. With the development of the economy, industrial demands have increased more and more. For example, the demands for automotive engines, aircraft engines, turbine blades, etc. have skyrocketed. And the demands for aviation and military products have not decreased significantly. It is worth mentioning that nowadays, the investment casting technology is widely used, not only limited to the military and aviation fields, but also involved in multiple fields such as transportation, pharmaceuticals, medical devices, electricity, and chemicals.

[0005] For precision castings, the most important performance index is dimensional accuracy, which requires the shrinkage rate of precision casting wax to be as low as possible. See the Chinese patent document with the patent literature number CN110205092A, which proposes a preparation method of a repair wax for investment casting; the Chinese patent document with the patent literature number CN108329701A gives a preparation method of an investment casting wax; the Chinese patent document with the patent literature number CN109265847A proposes a preparation method of a quick-drying composite wax for investment casting. These patent documents mainly solve process problems such as demoulding property, product surface finish, and molding speed, and involve less in the strength performance, dimensional stability, and operability of investment casting wax.

Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a precision casting wax, its preparation method and application. The precision casting wax mold prepared by the present invention has a low shrinkage rate and high strength.

[0007] To solve the above technical problems, the following technical solution is adopted for the precision casting wax in the present invention: The mass composition of the raw materials of the precision casting wax includes the following components: 20-30 parts of microcrystalline wax, 5-10 parts of paraffin wax, 10-16 parts of montan wax, 0-5 parts of carnauba wax, 7-15 parts of Piccotex75 resin, 5-12 parts of terpene resin, 5-15 parts of glycerol ester of rosin, 2-10 parts of ethylene-vinyl acetate, 4-8 parts of stearic acid, 3-10 parts of D-mannitol, 5-10 parts of adipic acid, 0-5 parts of polymethyl methacrylate; the total of the above components is 100 parts.

[0008] Furthermore, in the above technical solution of the precision casting wax, the melting point of the microcrystalline wax is 75 °C; the melting point of the paraffin wax is 60-62 °C, which is 60# fully refined paraffin wax; the melting point of the montan wax is 75-86 °C; the melting point of the carnauba wax is 83.5 °C; the melting point of the stearic acid is 67-72 °C; the softening point of the terpene resin is 80 °C; the softening point of the glycerol ester of rosin is 78-90 °C, and the acid value ≤ 9 (KOH / (mg / g)).

[0009] Furthermore, in the above technical solution of the precision casting wax, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 wt%, and the melt index is 400 g / 10 min.

[0010] Furthermore, in the above technical solution of the precision casting wax, the Piccotex75 resin is a copolymer of α-methylstyrene and vinyltoluene, and the molar ratios are 75 / 25 respectively, and the softening point is 75 °C.

[0011] Furthermore, in the above technical solution of the precision casting wax, the D-mannitol is of ultra-pure grade, ≥ 99.0% (HPLC); 100% of the D-mannitol and adipic acid can pass through a 100-mesh sieve, and 80% can pass through a 200-mesh sieve.

[0012] Furthermore, in the above technical solution of the precision casting wax, the polymethyl methacrylate can pass through a 500-mesh sieve, and the relative molecular mass is 150,000.

[0013] The following technical solution is adopted for the preparation method of the precision casting wax in the present invention. The preparation method includes the following steps:

[0014] (1) Add microcrystalline wax, paraffin wax, and stearic acid into a polymerization flask, heat at 80 - 100 °C, and continuously stir until melted. Then add Piccotex 75 resin, continue heating to 100 - 110 °C, keep warm for 30 min and continuously stir until melted; (2) Continue to raise the temperature to 120 °C - 130 °C, add ethylene-vinyl acetate copolymer, and continuously stir until melted; (3) Continue to add terpene resin, and keep at 120 °C - 130 °C for 60 - 120 min, slowly stir until evenly mixed and completely melted into a transparent state; (4) Cool the above materials to 90 - 100 °C, add montan wax, glycerol ester of rosin, and / or carnauba wax, and continuously keep warm and stir for 30 - 60 min until evenly mixed; (5) Add adipic acid, D-mannitol, and / or polymethyl methacrylate successively at 90 - 100 °C, continuously stir until evenly mixed, keep warm for 60 - 90 min, and make granules after cooling to obtain the precision casting wax.

[0015] The precision casting wax prepared by the above technical solution can be used to prepare wax models for high-precision aviation casting structural parts and wax models for other precision castings.

[0016] The present invention introduces functional additives such as Piccotex 75 resin, terpene resin, and D-mannitol, adjusts the composition and proportion of the wax mold material, improves the surface hardness and flexural strength of the precision casting wax, and reduces the shrinkage rate; ultimately achieves the purpose of high flexural hardness and surface hardness of the precision casting wax and reducing the shrinkage rate of the precision casting wax.

Specific Embodiment

[0017] The present invention relates to a preparation method of a precision casting wax and the specific application of the precision casting wax prepared by this preparation method. The precision casting wax mold prepared by this formula has a lower shrinkage rate and higher strength.

[0018] When preparing the precision casting wax of the present invention, prepare raw materials according to the following mass component ratio:

[0019] (1) 5 - 10 parts of paraffin wax;

[0020] (2) 20 - 30 parts of microcrystalline wax;

[0021] (3) 10 - 16 parts of montan wax;

[0022] (4) 2 - 10 parts of ethylene-vinyl acetate copolymer;

[0023] (5) 4 - 8 parts of stearic acid;

[0024] (6) 7 - 15 parts of Piccotex 75 resin;

[0025] (7) 5 - 12 parts of terpene resin;

[0026] (8) 3 - 10 parts of D - mannitol;

[0027] (9) 5 - 10 parts of adipic acid;

[0028] (10) 0 - 5 parts of carnauba wax (when the value is 0, it means not added);

[0029] (11) 5 - 15 parts of glycerol rosinate;

[0030] (12) 0 - 5 parts of polymethyl methacrylate (when the value is 0, it means not added);

[0031] The total of the above components is 100 parts.

[0032] The melting point of the paraffin wax is 60 - 62 °C, which is 60# fully refined paraffin wax; the melting point of the microcrystalline wax is 75 °C; the melting point of the montan wax is 75 - 86 °C; the content of vinyl acetate in the ethylene - vinyl acetate copolymer is 28 wt%, 400 g / 10 min; the melting point of the stearic acid is 67 - 72 °C; the Piccotex 75 resin is a copolymer of α - methylstyrene and vinyltoluene, with a molar ratio of 75 / 25 respectively, and a softening point of 75 °C; the softening point of the terpene resin is 80 °C; the D - mannitol is of ultra - pure grade, ≥99.0% (HPLC); 100% of the D - mannitol and adipic acid can pass through a 100 - mesh sieve, and 80% can pass through a 200 - mesh sieve; the melting point of the carnauba wax is 83.5 °C; the softening point of the glycerol rosinate is 78 - 90 °C, and the acid value ≤9 (KOH / (mg / g)); the polymethyl methacrylate has a relative molecular mass of 150000, can pass through a 500 - mesh sieve, and has an average particle size of 25 microns.

[0033] The glycerol rosinate is preferably hydrogenated glycerol rosinate, which has high stability, low shrinkage rate and color consistency, and is more suitable for aviation precision casting.

[0034] The preparation method of a precision casting wax pattern of the present invention is carried out according to the following steps:

[0035] (1) Add microcrystalline wax, paraffin wax, and stearic acid into a polymerization flask, heat at 80 - 100 °C, continuously stir until melted, then add Piccotex 75 resin, continue to heat to 100 - 110 °C, keep warm for 30 min and continuously stir until melted.

[0036] (2) Continue to raise the temperature to 120 °C - 130 °C, add the ethylene - vinyl acetate copolymer, and continuously stir until melted.

[0037] (3) Continue to add terpene resin and keep it at 120°C - 130°C for 60 - 120 min, and stir slowly until it is evenly mixed and completely melted into a transparent state.

[0038] (4) Cool the above materials to 90 - 100°C, add montan wax, rosin glyceride, and / or carnauba wax, and continuously keep it warm and stir for 30 - 60 min until it is evenly mixed.

[0039] (5) Add adipic acid, D-mannitol, and / or polymethyl methacrylate successively at 90 - 100°C, continuously stir until it is evenly mixed, keep it warm for 60 - 90 min, and make it into particles after cooling to obtain the precision casting wax.

[0040] The obtained precision casting wax can be melted and injected by any injection machine to produce various types of small mold parts, and various properties of the small mold parts can be tested.

[0041] The testing method for the precision casting mold material is as follows:

[0042] Melting point: Use DSC to test the melting point of the precision casting wax.

[0043] Hardness: Use a Shore hardness tester to test the hardness of the precision casting wax.

[0044] Viscosity: Execute according to the method specified in GB / T14235.1.

[0045] Flexural strength: Execute according to the method specified in GB / T14235.1.

[0046] Linear shrinkage rate: Execute according to the method specified in GB / T14235.1.

[0047] Ash content: Use TG to test the residual ash content of the precision casting wax.

[0048] The viscosity of the investment casting wax prepared by the present invention is between 210 - 500 mPa·s, and the shrinkage rate is between 0.05 - 0.5%. The lower shrinkage rate can improve the precision of the casting; the flexural strength of the investment casting wax is between 5 - 8 MPa, and the hardness is between 35 - 55, which ensures the high strength and high hardness of the investment casting wax during the casting process and improves the stability; the ash content of the investment casting wax is below 0.02%, ensuring no pollution during the casting process; the melting point of the investment casting wax is between 54 - 58°C, making it easier to demold during the casting process. The stability, high strength, high hardness, low ash content, suitable melting point, and easy demolding of the investment casting wax are beneficial to improving the efficiency of investment casting. The internal components of the investment casting wax provided by the present invention are uniform, the shrinkage rate of each part is uniform, and the wax has a relatively high strength, and can be widely used in the preparation of wax models for high-precision aviation casting structural parts and other wax models for precision casting.

[0049] The precision casting wax of the present invention will be further described in detail below in conjunction with the embodiments of the present invention:

[0050] Embodiment 1

[0051] The raw materials and mass component ratios of the precision casting wax are as follows: 45 grams of microcrystalline wax, 10 grams of paraffin wax, 10 grams of stearic acid, 20 grams of Piccotex 75 resin, 5 grams of ethylene-vinyl acetate, 10 grams of D-mannitol, 14 grams of adipic acid, 20 grams of terpene resin, 5.5 grams of carnauba wax, 25 grams of montan wax, 12 grams of rosin glyceride, and 3.5 grams of polymethyl methacrylate.

[0052] Its preparation method includes the following steps:

[0053] (1) Add microcrystalline wax, paraffin wax, and stearic acid to a 250 ml polymerization flask, heat at 100 °C, continuously stir until melted, then add Piccotex 75 resin, continue heating to 110 °C, keep warm for 30 min and continuously stir until melted.

[0054] (2) Continue to raise the temperature to 130 °C, add ethylene-vinyl acetate copolymer, and continuously stir until melted.

[0055] (3) Continue to add terpene resin, and keep it at 130 °C for 60 min, slowly stir until evenly mixed and completely melted into a transparent state.

[0056] (4) Cool the above materials to 100 °C, add montan wax, carnauba wax, and rosin glyceride, and continuously keep warm and stir for 30 min until evenly mixed.

[0057] (5) Add polymethyl methacrylate, adipic acid, and D-mannitol successively at 100 °C, continuously stir until evenly mixed, keep warm for 90 min, and make granules after cooling to obtain the precision casting wax.

[0058] Embodiment 2:

[0059] The raw materials and mass component ratios of Embodiment 2 are as follows: 45 grams of microcrystalline wax, 15 grams of paraffin wax, 11.2 grams of stearic acid, 25 grams of Piccotex 75 resin, 3.8 grams of ethylene-vinyl acetate, 3 grams of polymethyl methacrylate, 17.5 grams of terpene resin, 25 grams of montan wax, 15 grams of rosin glyceride, 7.5 grams of D-mannitol, and 18 grams of adipic acid.

[0060] Its preparation method includes the following steps:

[0061] (1) Add microcrystalline wax, paraffin wax, and stearic acid to a 250 ml polymerization flask, heat at 90 °C, continuously stir until melted, then add Piccotex 75 resin, continue heating to 100 °C, and continuously stir until melted.

[0062] (2)Continue to heat up to 120 °C, add ethylene-vinyl acetate copolymer, and continuously stir until melted.

[0063] (3)Continue to add terpene resin, keep it at 120 °C for 90 min, and stir slowly until evenly mixed.

[0064] (4)Cool the above materials to 90 °C, add lignite wax, and continuously stir until evenly mixed.

[0065] (5)At 90 °C, add polymethyl methacrylate and adipic acid in sequence, continuously stir until evenly mixed, keep warm for 90 min, and make granules after cooling to obtain the precision casting wax.

[0066] Example 3:

[0067] The raw materials and mass component ratios of Example 3 are: 40 g of microcrystalline wax, 18 g of paraffin wax, 10 g of stearic acid, 20 g of Piccotex75 resin, 15 g of ethylene-vinyl acetate, 12.5 g of rosin glyceride, 10 g of D-mannitol, 14.6 g of adipic acid, 17 g of terpene resin, 25 g of lignite wax, 2.5 g of carnauba wax, and 4.5 g of polymethyl methacrylate.

[0068] Its preparation method includes the following steps:

[0069] (1)Add microcrystalline wax, paraffin wax, and stearic acid into a 250 ml polymerization bottle, heat at 95 °C, continuously stir until melted, then add Piccotex75 resin, continue to heat to 100 °C, keep warm for 30 min and continuously stir until melted.

[0070] (2)Continue to heat up to 120 °C, add ethylene-vinyl acetate copolymer, and continuously stir until melted.

[0071] (3)Continue to add terpene resin, and keep it at 120 °C for 120 min, stir slowly until evenly mixed and completely melted into a transparent state.

[0072] (4)Cool the above materials to 95 °C, add lignite wax, carnauba wax, and rosin glyceride, and continuously keep warm and stir for 30 min until evenly mixed.

[0073] (5)At 95 °C, add polymethyl methacrylate, adipic acid, and D-mannitol respectively, continuously stir until evenly mixed, keep warm for 60 min, and make granules after cooling to obtain the precision casting wax.

[0074] Example 4:

[0075] The raw materials and mass component ratios of Example 4 are as follows: 39 grams of microcrystalline wax, 15 grams of paraffin wax, 11 grams of stearic acid, 25 grams of Piccotex 75 resin, 7.5 grams of ethylene-vinyl acetate, 3.5 grams of polymethyl methacrylate, 17 grams of terpene resin, 25 grams of montan wax, 11.6 grams of adipic acid, 15 grams of D-mannitol, 20 grams of glycerol ester of rosin, and 5 grams of carnauba wax.

[0076] Its preparation method includes the following steps:

[0077] (1) Add microcrystalline wax, paraffin wax, and stearic acid into a 250-milliliter polymerization flask, heat at 90 °C, continuously stir until melted, add Piccotex 75 resin, continue to heat to 110 °C, and keep stirring for 30 minutes until melted.

[0078] (2) Continue to raise the temperature to 120 °C, add ethylene-vinyl acetate copolymer, and continuously stir until melted.

[0079] (3) Continue to add terpene resin, keep at 120 °C for 120 minutes, and stir slowly until evenly mixed.

[0080] (4) Cool the above materials to 90 °C, add montan wax, carnauba wax, and glycerol ester of rosin, and continuously stir and keep warm for 30 minutes until evenly mixed.

[0081] (5) Sequentially add polymethyl methacrylate, adipic acid, and D-mannitol to the product obtained in step 4, continuously stir until evenly mixed, keep warm for 90 minutes, and make granules after cooling to obtain the precision casting wax.

[0082] Comparative Example 1:

[0083] The raw materials and mass component ratios of Comparative Example 1 are as follows: 43 grams of microcrystalline wax, 12 grams of paraffin wax, 10 grams of stearic acid, 20 grams of Piccotex 75 resin, 5 grams of ethylene-vinyl acetate, 14 grams of polymethyl methacrylate, 33 grams of terpene resin, 25 grams of montan wax, 14 grams of glycerol ester of rosin, 13.8 grams of D-mannitol, and 12 grams of adipic acid.

[0084] In the above components, the amounts of polymethyl methacrylate and terpene resin exceed the dosage range of the present invention.

[0085] The preparation method is the same as that of Example 1.

[0086] Comparative Example 2:

[0087] The raw materials and mass component ratios of Comparative Example 2 are as follows: 43 grams of microcrystalline wax, 12 grams of paraffin wax, 12 grams of stearic acid, 37 grams of Piccotex 75 resin, 4 grams of ethylene-vinyl acetate, 4 grams of polymethyl methacrylate, 16 grams of terpene resin, 22 grams of montan wax, 4 grams of carnauba wax, 12.5 grams of glycerol ester of rosin, 13.8 grams of D-mannitol, and 15 grams of adipic acid.

[0088] Among the above components, the amount of Piccotex 75 resin exceeds the dosage range of the present invention.

[0089] The preparation method is the same as that of Example 1.

[0090] Comparative Example 3:

[0091] The raw materials and mass component ratios of Comparative Example 3 are as follows: 43 grams of microcrystalline wax, 12 grams of paraffin wax, 20 grams of stearic acid, 27 grams of Piccotex 75 resin, 5 grams of ethylene-vinyl acetate, 4 grams of polymethyl methacrylate, 15 grams of terpene resin, 24 grams of montan wax, 5 grams of carnauba wax, 12.5 grams of glycerol ester of rosin, 10.3 grams of D-mannitol, and 16.2 grams of adipic acid.

[0092] Among the above components, the amount of stearic acid exceeds the dosage range of the present invention.

[0093] The preparation method is the same as that of Example 1.

[0094] Comparative Example 4:

[0095] The raw materials and mass component ratios of Comparative Example 4 are as follows: 33 grams of microcrystalline wax, 15 grams of paraffin wax, 5.5 grams of stearic acid, 22.5 grams of Piccotex 75 resin, 4.8 grams of ethylene-vinyl acetate, 2.5 grams of polymethyl methacrylate, 15.5 grams of terpene resin, 25 grams of montan wax, 14.5 grams of adipic acid, 15 grams of glycerol ester of rosin, and 27.5 grams of D-mannitol.

[0096] Among the above components, the amounts of microcrystalline wax, stearic acid, and D-mannitol exceed the dosage range of the present invention.

[0097] The preparation method is the same as that of Example 1.

[0098] Comparative Example 5:

[0099] The raw materials and mass component ratios of Comparative Example 5 are as follows: 42 grams of microcrystalline wax, 15 grams of paraffin wax, 11.5 grams of stearic acid, 22.5 grams of Piccotex 75 resin, 5.8 grams of ethylene-vinyl acetate, 3 grams of polymethyl methacrylate, 24 grams of montan wax, 15 grams of D-mannitol, and 25 grams of adipic acid.

[0100] Among the above components, the amount of adipic acid exceeds the dosage range of the present invention.

[0101] The preparation method is the same as that of Example 1.

[0102] The casting waxes prepared in the above Examples 1-4 and Comparative Examples 1-5 were used to produce small mold parts by an injection machine for testing. The test performance is shown in Table 1 below.

[0103] Table 1: Performance test data of precision investment casting wax

[0104]

[0105] As can be seen from Table 1, the wax of the investment casting wax of the present invention has a moderate melting point, a small linear shrinkage rate, a high hardness, a large bending strength, a small ash content, and a viscosity that is very easy to control. At the same time, it can also be seen from Table 1 that when certain components in the precision investment casting wax formula exceed the range, it has a great impact on the comprehensive performance.

[0106] The above is a better technical solution of the embodiments of the present invention. The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Those of ordinary skill in the art can still modify or equivalently replace the technical solutions of the embodiments of the present invention, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical plan of the embodiments of the present invention.

Claims

1. A precision casting wax, characterized in that: The mass composition of the precision casting wax raw material includes the following components: 20-30 parts of microcrystalline wax, 5-10 parts of paraffin wax, 10-16 parts of montan wax, 0-5 parts of carnauba wax, 7-15 parts of Piccotex75 resin, 5-12 parts of terpene resin, 5-15 parts of rosin glycerol ester, 2-10 parts of ethylene-vinyl acetate, 4-8 parts of stearic acid, 3-10 parts of D-mannitol, 5-10 parts of adipic acid, and 0-5 parts of polymethyl methacrylate; the above components total 100 parts.

2. A precision casting wax according to claim 1, characterized in that: The melting point of the microcrystalline wax is 75°C; the melting point of the paraffin is 60-62°C, which is 60# fully refined paraffin; the melting point of the montan wax is 75-86°C; the melting point of the carnauba wax is 83.5°C; the melting point of the stearic acid is 67-72°C; the softening point of the terpene resin is 80°C; the softening point of the rosin glycerol ester is 78-90°C, and the acid value is ≤9 (KOH / (mg / g)).

3. A precision casting wax according to claim 1, characterized in that: The vinyl acetate content in the ethylene-vinyl acetate copolymer is 28 wt % and the melt index is 400 g / 10 min.

4. The precision casting wax according to claim 1, characterized in that: The Piccotex 75 resin is a copolymer of α-methylstyrene and vinyltoluene, with a molar ratio of 75 / 25 and a softening point of 75°C.

5. The precision casting wax according to claim 1, characterized in that: The D-mannitol is of ultrapure grade, ≥99.0% (HPLC); 100% of the D-mannitol and adipic acid can pass through a 100-mesh sieve, and 80% can pass through a 200-mesh sieve.

6. The precision casting wax according to claim 1, characterized in that: The polymethyl methacrylate can pass through a 500-mesh sieve and has a relative molecular mass of 150,000.

7. A method for preparing precision casting wax, characterized in that: Using a precision casting wax as described in any one of claims 1 to 6, the preparation method comprises the following steps: (1) Add microcrystalline wax, paraffin wax and stearic acid to a polymerization bottle, heat at 80-100°C, stir continuously until melted, then add Piccotex75 resin, continue heating to 100-110°C, keep warm for 30 minutes and stir continuously until melted; (2) Continue to raise the temperature to 120°C to 130°C, add ethylene-vinyl acetate copolymer, and continue stirring until it melts; (3) Continue to add terpene resin and keep the temperature at 120° C. to 130° C. for 60 to 120 minutes, stirring slowly until the mixture is evenly mixed and completely melted into a transparent state; (4) Cooling the above materials to 90-100° C., adding montan wax, rosin glycerol ester, and / or carnauba wax, and continuing to stir and keep warm for 30-60 minutes until the mixture is evenly mixed; (5) Add adipic acid, D-mannitol, and / or polymethyl methacrylate in sequence at 90-100° C., continue stirring until the mixture is uniformly mixed, keep the mixture warm for 60-90 minutes, and form particles after cooling to obtain the precision casting wax.

8. An application of precision casting wax, characterized in that: The precision casting wax is prepared by the method for preparing a precision casting wax according to claim 7, and the precision casting wax is used for preparing wax models of high-precision aviation casting structural parts.

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