A precision casting wax filling material for titanium alloy and a preparation method thereof

Abstract

The application provides a filling wax mould material for titanium alloy precision casting and a preparation method thereof. The filling wax mould material comprises the following components in parts by weight: rosin 4-6 parts, low-density polyethylene 4-6 parts, 58# paraffin 48-50 parts, stearic acid 30-32 parts, lignite wax 2-4 parts, epoxy resin 4-8 parts, and filler 0.5-1.5 parts. The filler is hexagonal boron nitride. The preparation method of the filling wax mould material for titanium alloy precision casting comprises the following steps: step 1, preparing esterified rosin; step 2, obtaining mixture A; step 3, obtaining mixture B; step 4, obtaining mixture C; step 5, obtaining mixture D; step 6, obtaining mixture E; step 7, heating and dispersing and stirring mixture E for 4 hours; step 8, obtaining mixture F; and step 9, continuing to heat and stir mixture F at 90 DEG C for 3 hours, then stopping heating, and granulating when the melt temperature cools to 80-85 DEG C, thereby obtaining the filling wax mould material for precision casting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precision casting wax and its preparation method, in particular to a filling type precision casting wax mold material and its preparation method. BACKGROUND

[0002] In the prior art, titanium and titanium alloy are widely used in aerospace, marine chemical industry and other fields due to their high specific strength, strong corrosion resistance and good high-temperature service performance. In recent years, with the implementation of major projects and key projects, there is an increasing urgent need for the preparation of large-scale complex thin-walled integrated titanium alloy components.

[0003] As a kind of precision forming technology, investment precision casting has become one of the important means for the development of new generation equipment due to its high casting dimensional accuracy and the advantage of not being limited by product shape and complexity.

[0004] The general process of investment precision casting process is: preparing a mold according to product design, obtaining an original wax mold by pressure injection method; performing the processes of slurry immersion and sanding on the wax mold in a cycle to prepare a shell; then removing the internal wax mold by infrared heating method, and obtaining a casting cavity after baking.

[0005] At present, the commonly used wax mold materials on the market mainly include paraffin and resin, which are generally simple in composition. Although they have good plasticity and filling property, they inevitably have the disadvantages of poor environmental resistance, poor dimensional accuracy, low strength and high ash content, which are not conducive to the control of casting dimensional accuracy and surface quality, and are difficult to meet the development requirements of titanium and titanium alloy component structure and function integration, large-scale complex thin-walling and high-quality. SUMMARY

[0006] The present application provides a filling wax mold material suitable for titanium alloy precision casting, and provides a corresponding preparation method. The filling wax mold material for titanium alloy precision casting has the characteristics of high strength, low penetration, small ash content and good shrinkage consistency.

[0007] The technical scheme of the present application is as follows:

[0008] The present application provides a filling wax mold material for titanium alloy precision casting, characterized by comprising the following components in terms of weight fraction: rosin 4-6 parts, low-density polyethylene (LDPE) 4-6 parts, 58# paraffin 48-50 parts, stearic acid 30-32 parts, lignite wax 2-4 parts, epoxy resin 4-8, and filler 0.5-1.5 parts; the filler is hexagonal boron nitride (h-BN).

[0009] The filling wax mold material for titanium alloy precision casting according to the present application is further preferably one of the following:

[0010] The titanium alloy precision casting filling wax comprises the following components by weight fraction: rosin 4 parts, LDPE 4 parts, 58# paraffin wax 48 parts, stearic acid 30 parts, lignite wax 2 parts, epoxy resin 8 parts, and filler 0.5 parts.

[0011] The titanium alloy precision casting filling wax comprises the following components by weight fraction: rosin 5 parts, LDPE 5 parts, 58# paraffin wax 49 parts, stearic acid 31 parts, lignite wax 3 parts, epoxy resin 6 parts, and filler 1 part.

[0012] The titanium alloy precision casting filling wax comprises the following components by weight fraction: rosin 6 parts, LDPE 6 parts, 58# paraffin wax 50 parts, stearic acid 32 parts, lignite wax 4 parts, epoxy resin 4 parts, and filler 1.5 parts.

[0013] The filler in the titanium alloy precision casting filling wax is preferably hexagonal boron nitride modified by a silane coupling agent.

[0014] In the titanium alloy precision casting filling wax, the weight ratio of the 58# paraffin wax and the stearic acid is in the range of 1.55-1.6; the rosin must be subjected to esterification treatment to remove the contained double bonds and carboxyl groups; the molecular weight of the used low-density polyethylene LDPE is distributed in the range of 1000-1500; this is because the LDPE has a relatively developed branched chain structure, so that the melting point is relatively lower than that of the polyethylene with a higher molecular weight, and the flowability in the molten state is better, so that the LDPE is suitable to be used as a wax material blending agent to improve the toughness and plasticity of the wax material; the filler can be spherical hexagonal boron nitride, the median particle size of the powder is 43-45 μm, the specific surface area is 30-40 m 2 / g, and the spherical hexagonal boron nitride is required to be further modified by a silane coupling agent before being added to increase the dispersibility of the powder filler in the wax material.

[0015] The preparation method of the titanium alloy precision casting filling wax mold material as described above comprises the following steps and contents in sequence:

[0016] Step 1, the terpene phenol resin carboxylic acid sodium salt and isobutyl alcohol are mixed into rosin, heated at 260°C, and continuously stirred for 6 hours, until the esterification rate of the rosin is more than 95%, then the terpene phenol resin carboxylic acid sodium salt is separated out, and the esterified rosin is obtained;

[0017] Further preferred step 1 also meets the following requirements: isobutyl alcohol is mixed into the rosin at a certain molar ratio, n (rosin) : n (isobutyl alcohol) = 1:25, and then a certain amount of terpene phenol resin carboxylic acid sodium salt is added to the two, the amount of terpene phenol resin carboxylic acid sodium salt is 5%~7% of the amount of rosin added, and the three substances are accurately weighed according to the proportion and added to the reaction kettle; then heated at 260℃ under a nitrogen atmosphere, continuously stirred for 6 hours, until the esterification rate of the rosin reaches more than 95%, and then the terpene phenol resin carboxylic acid sodium salt is separated out to obtain esterified rosin;

[0018] Step 2: The esterified rosin obtained in step 1 is heated at 120~130℃ for 4 minutes, and then LDPE is added, and the stirring is continued for 3h until the remaining LDPE content in the reaction kettle is less than 8%, to obtain mixture A;

[0019] Step 3: The mixture A obtained in step 2 is added with epoxy resin under stirring, and the heating temperature is raised to 160℃, and the stirring is continued until the three components are completely melted, and then mixture B is obtained;

[0020] Step 4: The temperature of the reaction kettle is reduced to 120℃, and the mixture B obtained in step 3 is added with lignosol, and the stirring is continuously carried out until the lignosol is completely melted, to obtain mixture C;

[0021] Step 5: The mixture C obtained in step 4 is continuously heated for 6 minutes, and then the temperature of the reaction kettle is adjusted to 110℃, and after the temperature is stabilized, 58# paraffin wax is added and stirred until it is completely melted, to obtain mixture D;

[0022] Step 6: The mixture D obtained in step 5 is continuously heated at 110℃ for 5 minutes, and modified hexagonal boron nitride is added, and the temperature is maintained at 100~110℃, and the stirring is continuously carried out until the modified hexagonal boron nitride is completely dispersed and uniform, to obtain mixture E;

[0023] Step 7: The temperature of the reaction kettle is stabilized at 100℃, and the mixture E obtained in step 6 is continuously dispersed and stirred at this temperature for 4h;

[0024] Step 8: The temperature of the reaction kettle is reduced to 95℃, and the mixture E is continuously stirred at this temperature for 20 minutes, and then the temperature of the reaction kettle is further reduced to 90℃, and after the temperature is stabilized, stearic acid is added, and the stirring is carried out until the stearic acid is completely melted, to obtain mixture F;

[0025] Step 9: The mixture F obtained in step 8 is continuously heated and stirred at 90℃ for 3h, and then the heating is stopped, and when the temperature of the melt is cooled to 80~85℃, the granulation is carried out, to obtain the filling wax mold material for precision casting.

[0026] The beneficial effects of the present application are:

[0027] 1. The addition of low-density polyethylene (LDPE) increases the melting point and flexural strength of the mold material to 70°C and 6.84 MPa. Within the component range specified in the present invention, the melting point of the low-density polyethylene (LDPE) component is higher than that of other components. During the crystallization process, the low-density polyethylene (LDPE) molecular chain easily forms a "molecular bridge" between the spherulites and the lamellar crystals. During the solidification process of the wax material, it first precipitates to form a crystal nucleus, prompting the remaining liquid phase to precipitate to form crystals with it as the core, effectively promoting the increase of the system's crystallinity, increasing the regularity of the molecular arrangement in the mixture system, refining the wax material microstructure, and improving the melting point and flexural strength of the wax mold material (see Figure 1 、 2 ).

[0028] 2. Hexagonal boron nitride (h-BN) is modified with a silane coupling agent and epoxy groups are introduced at its ends, which increases the dispersibility of the filler in organic components. Furthermore, the "pinning" effect of h-BN during the cooling and shrinkage of the alkane component significantly increases the movement resistance of the long-chain alkane component, thereby effectively reducing the shrinkage of the mold material. At the same time, the chain-like arrangement structure of h-BN after dispersion facilitates heat conduction, giving the wax mold material good thermal conductivity. These two effects synergistically improve the shrinkage consistency of the mold material.

[0029] 3. The addition ratio of paraffin wax and stearic acid should be between 1.55 and 1.6 (mass ratio). Under this ratio, the fusion effect of each component is optimal, that is, no single component will precipitate during the solidification process of the wax material, and the differential thermal analysis shows that the DSC curve is smooth (see Figure 3 );

[0030] 4. Terpene phenol resin carboxylic acid sodium salt and isobutyl alcohol are used to catalyze the esterification of rosin components at high temperature to overcome the defects of rosin components such as brittleness, easy oxidation, and poor aging resistance caused by the presence of double bonds and carboxyl groups in rosin. Adding esterified rosin is beneficial to improving the thermal stability and acid and alkali resistance of the wax material;

[0031] 5. The melting temperature range of the filled wax pattern material finally obtained by the above method is 65℃~80℃, and the viscosity has the characteristics of high strength, low thermal expansion, good shrinkage consistency, good thermal conductivity, and low ash content. The demolding time of the investment pattern is shortened to more than 40% of the original time, and the fluctuation range of the investment pattern size is reduced by one order of magnitude, which effectively solves the deformation problems such as shrinkage pits and warping caused by slow heat dissipation of the investment pattern of thin-walled parts, reduces the contamination of the titanium alloy liquid during the casting process, and improves the product dimensional stability, shell yield rate and casting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The effect of adding low-density polyethylene (LDPE) on the melting point of wax mold materials;

[0033] Figure 2 The effect of adding low-density polyethylene (LDPE) on the flexural strength of wax mold materials;

[0034] Figure 3 Effects of the mass ratio of paraffin and stearic acid on the fusion uniformity of the wax pattern material;

[0035] Figure 4 Microstructure of the filled wax pattern material. DETAILED DESCRIPTION

[0036] The application will be further described in conjunction with the examples and the accompanying drawings of the specification, but is not limited thereto.

[0037] Example 1

[0038] A titanium alloy precision casting filled wax pattern material, by weight fraction, comprises the following components: rosin 4-6 parts, low-density polyethylene (LDPE) 4-6 parts, 58# paraffin 48-50 parts, stearic acid 30-32 parts, lignite wax 2-4 parts, epoxy resin 4-8, filler 0.5-1.5 parts.

[0039] The precision casting filled wax pattern material is prepared by the following steps:

[0040] (1) A certain molar ratio of isobutyl alcohol is mixed into rosin, n (rosin) : n (isobutyl alcohol) = 1:25, and then a certain amount of terpene phenol resin carboxylic acid sodium salt is added to the two, the amount of terpene phenol resin carboxylic acid sodium salt is 5%-7% of the amount of rosin added, the above three substances are accurately weighed according to the proportion, and are added to the reaction kettle, heated under nitrogen atmosphere at 260℃, and continuously stirred for 6 hours, until the esterification rate of rosin reaches more than 95%, then the terpene phenol resin carboxylic acid sodium salt is separated out, and the esterified rosin is obtained;

[0041] (2) The esterified rosin obtained in step (1) is heated at 120-130℃ for 4 minutes, and then LDPE is added, and the stirring is continued for 3h until the remaining LDPE content in the reaction kettle is less than 8%, to obtain mixture A;

[0042] (3) Under stirring, the epoxy resin is added to the mixture A obtained in step (2), the heating temperature is raised to 160℃, and the stirring is continued until the three components are completely melted, to obtain mixture B;

[0043] (4) The temperature of the reaction kettle is reduced to 120℃, the lignite wax is added to the mixture B obtained in step (3), and the stirring is continuously carried out until the lignite wax is completely melted, to obtain mixture C;

[0044] (5) The mixture C obtained in step (4) is continuously heated for 6 minutes, then the temperature of the reaction kettle is adjusted to 110℃, and after the temperature is stabilized, the 58# paraffin is added, and the stirring is carried out until it is completely melted, to obtain mixture D;

[0045] (6) The mixture D obtained in step (5) is continuously heated at 110°C for 5 minutes, and modified h-BN is added, the temperature is kept at 100-110°C, and the stirring is continuously performed until the h-BN is completely dispersed and uniform, to obtain mixture E;

[0046] (7) The temperature of the reaction kettle is kept at 100°C, and the mixture E obtained in step (6) is continuously dispersed and stirred at this temperature for 4h;

[0047] (8) The temperature of the reaction kettle is reduced to 95°C, and the mixture E is continuously stirred at this temperature for 20 minutes, then the temperature of the reaction kettle is further reduced to 90°C, and after it is stabilized, stearic acid is added, and the stirring is performed until the stearic acid is completely melted, to obtain mixture F;

[0048] (9) The mixture F obtained in step (8) is continuously heated and stirred at 90°C for 3h, then the heating is stopped, and when the temperature of the melt is cooled to 80-85°C, granulation is performed, to obtain the wax-filling mold material for precision casting.

[0049] Example 2

[0050] A wax-filling mold material for titanium alloy precision casting comprises, by weight fraction, the following components: rosin 4 parts, LDPE 4 parts, 58# paraffin wax 48 parts, stearic acid 30 parts, lignite wax 2 parts, epoxy resin 4

[0051] parts, and filler 0.5 parts. The wax-filling mold material for precision casting is prepared by the following steps:

[0052] (1) A certain amount of isobutyl alcohol is mixed into rosin at a certain molar ratio, n (rosin) : n (isobutyl alcohol) = 1:25, then a certain amount of terpene phenol resin carboxylic acid sodium salt is added, the amount of terpene phenol resin carboxylic acid sodium salt is 5%-7% of the amount of rosin, the above three substances are accurately weighed according to the proportion, and are added into a reaction kettle, heated at 260°C under a nitrogen atmosphere, and continuously stirred for 6 hours, until the esterification rate of rosin is more than 95%, then the terpene phenol resin carboxylic acid sodium salt is separated, to obtain esterified rosin;

[0053] (2) The esterified rosin obtained in step (1) is heated at 120-130°C for 4 minutes, then LDPE is added, and the stirring is continuously performed for 3h until the remaining LDPE content in the reaction kettle is less than 8%, to obtain mixture A;

[0054] (3) The mixture A obtained in step (2) is added with epoxy resin under stirring, the heating temperature is increased to 160°C, and the stirring is continuously performed until the three components are completely melted, to obtain mixture B;

[0055] (4) The temperature of the reaction kettle is reduced to 120°C, the mixture B obtained in step (3) is added with lignite wax, and the stirring is continuously performed until the lignite wax is completely melted, to obtain mixture C;

[0056] (5) After the mixture C obtained in step (4) is continuously heated for 6 minutes, the temperature of the reaction kettle is adjusted to 110°C, and 58# paraffin is added after the temperature is stabilized, and stirred until it is completely melted, to obtain mixture D;

[0057] (6) The mixture D obtained in step (5) is continuously heated at 110°C for 5 minutes, and modified h-BN is added while keeping the temperature at 100-110°C, and continuously stirred until the h-BN is completely dispersed and uniform, to obtain mixture E;

[0058] (7) The temperature of the reaction kettle is stabilized at 100°C, and the mixture E obtained in step (6) is continuously dispersed and stirred at this temperature for 4h;

[0059] (8) The temperature of the reaction kettle is reduced to 95°C, and the mixture E is continuously stirred at this temperature for 20 minutes, and then the temperature of the reaction kettle is further reduced to 90°C, and after it is stabilized, stearic acid is added, and heated and stirred until the stearic acid is completely melted, to obtain mixture F;

[0060] (9) The mixture F obtained in step (8) is continuously heated and stirred at 90°C for 3h, and then the heating is stopped, and the granulation is carried out when the temperature of the melt cools to 80-85°C, to obtain the wax-filling mold material for precision casting.

[0061] Example 3

[0062] A titanium alloy precision casting wax-filling mold material, comprising the following components by weight fraction: rosin 5 parts, LDPE 5 parts, 58# paraffin 49 parts, stearic acid 31 parts, lignite wax 3 parts, epoxy resin 6 parts, and filler 1 part. The precision casting wax-filling mold material is prepared by the following steps:

[0063] (1) A certain amount of isobutyl alcohol is mixed into rosin at a certain molar ratio, n (rosin) : n (isobutyl alcohol) = 1:25, and then a certain amount of terpene phenol resin carboxylic acid sodium salt is added to the two, and the amount of terpene phenol resin carboxylic acid sodium salt is 5%-7% of the amount of rosin added, and the above three substances are accurately weighed according to the proportion, and added to the reaction kettle, heated at 260°C under nitrogen atmosphere, and continuously stirred for 6 hours, until the esterification rate of rosin is more than 95%, and then the terpene phenol resin carboxylic acid sodium salt is separated out, to obtain esterified rosin;

[0064] (2) The esterified rosin obtained in step (1) is heated at 120-130°C for 4 minutes, and then LDPE is added, and continuously stirred for 3h until the remaining LDPE content in the reaction kettle is less than 8%, to obtain mixture A;

[0065] (3) under stirring, add epoxy resin into the mixture A obtained in step (2), increase the temperature to 160°C, continue stirring until the three components are completely melted, to obtain mixture B;

[0066] (4) reduce the temperature of the reactor to 120°C, add lignite wax into the mixture B obtained in step (3) and continue stirring until the lignite wax is completely melted, to obtain mixture C;

[0067] (5) continue heating the mixture C obtained in step (4) for 6 minutes, then adjust the temperature of the reactor to 110°C, and after the temperature is stable, add 58# paraffin and stir until it is completely melted, to obtain mixture D;

[0068] (6) continue heating the mixture D obtained in step (5) at 110°C for 5 minutes, add modified h-BN, keep the temperature at 100-110°C, and continue stirring until the h-BN is completely dispersed and uniform, to obtain mixture E;

[0069] (7) keep the temperature of the reactor at 100°C, and continue dispersing and stirring the mixture E obtained in step (6) at this temperature for 4h;

[0070] (8) reduce the temperature of the reactor to 95°C, continue stirring the mixture E at this temperature for 20 minutes, then further reduce the temperature of the reactor to 90°C, and after the temperature is stable, add stearic acid, and heat and stir until the stearic acid is completely melted, to obtain mixture F;

[0071] (9) continue heating and stirring the mixture F obtained in step (8) at 90°C for 3h, then stop heating, and when the temperature of the melt cools to 80-85°C, granulate, to obtain the wax-filling mold material for precision casting of titanium alloy.

[0072] Example 4

[0073] A wax-filling mold material for precision casting of titanium alloy, comprising the following components in terms of weight fraction: rosin 6 parts, LDPE 6 parts, 58# paraffin 50 parts, stearic acid 32 parts, lignite wax 4 parts, epoxy resin 8 parts, and filler 1.5 parts. The wax-filling mold material for precision casting is prepared by the following steps:

[0074] (1) mix terpene phenol resin carboxylic acid sodium salt and isobutyl alcohol into rosin, heat at 260°C, and continuously stir for 6 hours, until the esterification rate of rosin is more than 95%, and then separate the terpene phenol resin carboxylic acid sodium salt;

[0075] (2) heat the esterified rosin obtained in step (1) at 120-130°C for 4 minutes, then add LDPE, and continuously stir for 3h until the remaining LDPE content in the reactor is less than 8%, to obtain mixture A;

[0076] (3) under stirring, add epoxy resin into the mixture A obtained in step (2), increase the heating temperature to 160℃, continue stirring until the three components are completely melted, to obtain mixture B;

[0077] (4) reduce the temperature of the reactor to 120℃, add lignum wax into the mixture B obtained in step (3) and continuously stir until the lignum wax is completely melted, to obtain mixture C;

[0078] (5) continue heating the mixture C obtained in step (4) for 6 minutes, then adjust the temperature of the reactor to 110℃, and after the temperature is stable, add 58# paraffin and stir until it is completely melted, to obtain mixture D;

[0079] (6) continue heating the mixture D obtained in step (5) at 110℃ for 5 minutes, add modified h-BN, keep the temperature at 100~110℃, and continuously stir until the h-BN is completely dispersed and uniform, to obtain mixture E;

[0080] (7) keep the temperature of the reactor at 100℃, and continue dispersing and stirring the mixture E obtained in step (6) at this temperature for 4h;

[0081] (8) reduce the temperature of the reactor to 95℃, and continue stirring the mixture E at this temperature for 20 minutes, then further reduce the temperature of the reactor to 90℃, and after the temperature is stable, add stearic acid, and heat and stir until the stearic acid is completely melted, to obtain mixture F;

[0082] (9) continue heating and stirring the mixture F obtained in step (8) at 90℃ for 3h, then stop heating, and when the temperature of the melt cools to 80~85℃, granulate, to obtain the filling wax mold material for precision casting.

[0083] In the embodiment, the LDPE, rosin and h-BN are combined in the above mass proportions, which helps to improve the strength, shrinkage consistency and thermal conductivity of the casting wax, and further improve the precision and yield of the titanium alloy castings.

[0084] Take the prepared modulated wax of the embodiments 1, 2, 3 and 4 of the application respectively, test the technical indexes, take three common modulated waxes, and measure the following technical indexes, and the experimental data are shown in Table 1:

[0085] Table 1: detection results of the modulated wax prepared in the embodiments of the application and common modulated wax

[0086]

[0087] From the detection results in Table 1, it can be seen that the filled wax mold material manufactured by the application has good uniformity, the bending strength can be kept above 6 MPa, the penetration is obviously improved, which indicates that the mold material has good strength and hardness matching, ensures the structural integrity and surface quality of the mold; the softening point is kept at about 74℃, which ensures the smooth removal of the mold and improves the yield of high-quality shell; the shrinkage is stable and low, which ensures the stability and accuracy of the product size; the ash content is obviously reduced, which effectively inhibits the reaction of the alloy liquid and ensures the casting without pollution and low surface roughness. In summary, the overall comprehensive performance of the prepared wax mold material is better than that of the ordinary wax material.

[0088] The above is the preferred embodiment of the application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the application. These improvements and refinements are also considered within the protection scope of the application.

Claims

1. A titanium alloy precision casting wax pattern-filling compound characterized by: According to the weight fraction, including the following components: rosin 4~6 parts, low density polyethylene 4~6 parts, 58# paraffin wax 48~50 parts, stearic acid 30~32 parts, lignite wax 2~4 parts, epoxy resin 4~8, filler 0.5~1.5 parts; In the titanium alloy precision casting filling wax, the filler is hexagonal boron nitride modified by silane coupling agent; the weight ratio of the two components of 58# paraffin wax and stearic acid should be in the range of 1.55~1.

6.

2. The titanium alloy investment wax for precision casting according to claim 1, wherein: In the titanium alloy precision casting filling wax, the rosin requires the following pretreatment in advance: removing the contained double bond and carboxyl by esterification treatment; the used low-density polyethylene has a molecular weight distribution of 1000-1500; the filler adopts spherical hexagonal boron nitride, the median particle size of the powder is 43-45 μm, and the specific surface area is 30-40 m 2 / g.

3. The method for preparing the filled wax pattern material for titanium alloy precision casting according to claim 1, characterized in that: The preparation method comprises the following steps and contents in sequence: Step 1, mix terpene phenol resin carboxylic acid sodium salt and isobutyl alcohol in rosin, heat at 260℃, continuously stir for 6 hours, until the esterification rate of rosin is more than 95%, then separate the terpene phenol resin carboxylic acid sodium salt to obtain esterified rosin; Step 2, heat the esterified rosin obtained in step 1 at 120~130℃ for 4 minutes, then add low density polyethylene, continuously stir for 3h until the remaining unmelted low density polyethylene content in the reaction kettle is less than 8%, to obtain mixture A; Step 3, under stirring, add epoxy resin to the mixture A obtained in step 2, increase the heating temperature to 160℃, continue to stir until the three components are completely melted, then obtain mixture B; Step 4, reduce the temperature of the reaction kettle to 120℃, add lignite wax to the mixture B obtained in step 3, and continuously stir until the lignite wax is completely melted, to obtain mixture C; Step 5, continue to heat the mixture C obtained in step 4 for 6 minutes, then adjust the temperature of the reaction kettle to 110℃, add 58# paraffin wax after the temperature is stable, and stir until it is completely melted, to obtain mixture D; Step 6, continue to heat the mixture D obtained in step 5 at 110℃ for 5 minutes, add modified hexagonal boron nitride, keep the temperature at 100~110℃, and continuously stir until the modified hexagonal boron nitride is completely dispersed and uniform, to obtain mixture E; Step 7, keep the temperature of the reaction kettle at 100℃, and continue to disperse and stir the mixture E obtained in step 6 at this temperature for 4h; Step 8, reduce the temperature of the reaction kettle to 95℃, continue to stir the mixture E at this temperature for 20 minutes, then further reduce the temperature of the reaction kettle to 90℃, add stearic acid after the temperature is stable, and heat and stir until the stearic acid is completely melted, to obtain mixture F; Step 9, continue to heat and stir the mixture F obtained in step 8 at 90℃ for 3h, then stop heating, and granulate when the melt temperature cools to 80~85℃, to obtain the filling wax mold material.

4. The method for preparing a filled wax pattern material for titanium alloy precision casting according to claim 3, characterized in that: In step 1, the specific requirements for mixing terpene phenol resin carboxylic acid sodium salt and isobutyl alcohol in rosin are as follows: a certain molar ratio of isobutyl alcohol is mixed into rosin, and the molar ratio of rosin to isobutyl alcohol is 1:25; then a certain amount of terpene phenol resin carboxylic acid sodium salt is added, and the amount of terpene phenol resin carboxylic acid sodium salt is 5%~7% of the amount of rosin; accurately weigh the above three substances according to the proportion, and add them into the reaction kettle.

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