A lost-wax casting 3D photosensitive resin, its preparation method and application

Abstract

The present invention belongs to the technical field of jewelry manufacturing, and particularly relates to a lost-wax casting 3D photosensitive resin and its preparation method and application. The methacrylate oligomer used in the present invention contains a large amount of methyl groups, and the steric effect of the methyl groups can reduce the shrinkage rate after curing, improve the hardness and precision of the wax mold; polytetrahydrofuran can improve the flexibility of the cured wax mold and endow the wax mold with better physical and mechanical properties. The difunctional methacrylate monomer can reduce the viscosity of the system, improve the fluidity of the lost-wax casting 3D photosensitive resin, and at the same time can also adjust the ratio of the oligomer and the reactive monomer in the material to improve the printing success rate. The trifunctional methacrylate monomer has high reaction activity and a fast curing speed during printing, can quickly increase the initial strength during printing, is beneficial to 3D printing forming, and improves the printing precision.

Description

Technical Field

[0001] The present invention belongs to the technical field of jewelry manufacturing, and particularly relates to a lost-wax casting 3D photosensitive resin, a preparation method thereof, and an application thereof. Background Art

[0002] The production of wax patterns is an important part of the successful casting of jewelry. At present, there are three methods for producing wax patterns in the industry. The first method is to directly make a model with metal, polish it smoothly to obtain a master mold, then use mold rubber to press a rubber mold on the master mold, and use a wax injection machine to inject wax patterns on the rubber mold, and trim the wax patterns for casting; the second method is to use relatively hard hand-carved wax to carve a model, which is the wax pattern plate, and then use gypsum to make a gypsum mold according to the wax pattern plate, and cast it into a metal master mold by lost-wax casting, and then repeat the mold pressing and wax injection process described in the first method; the third method is to draw a digital model with jewelry design software (such as Rhino), and use 3D photosensitive resin to print a resin model as a wax pattern through a 3D printer for casting. The comparison of the three methods is as Figure 1 shown. However, the first two methods have a long production cycle, are severely dependent on the level of craftsmen, require a large amount of manpower and time costs, and it is also very difficult to modify the design later. The third method applies 3D printing technology, that is, "additive manufacturing" technology, and its technical connotation is to realize the manufacturing of structural parts by digitally adding materials. This method can not only produce wax patterns quickly and efficiently, reduce the cost and risk of process research, but also conform to the demand trend of personalized customization.

[0003] At present, the application of 3D printing technology in the jewelry industry has been widely recognized. However, the subsequent problem lies in the lost-wax casting 3D photosensitive resin that matches it. Due to the particularity of the jewelry industry, the printed wax pattern needs to be burned at high temperature in the lost-wax casting step after being cleaned, removing supports, and secondary photocuring before it can be cast to finally obtain a jewelry casting. This requires that the lost-wax casting 3D photosensitive resin not only has a high printing success rate and good accuracy, but also has less ash residue and low burning odor during the subsequent burning process. However, the lost-wax casting 3D photosensitive resins on the current market cannot fully meet the customer's requirements in both the printing and casting processes. Those that are easy to print are not easy to cast. Due to a large amount of ash residue, the surface of the castings is not smooth or even defective, and it needs to rely on craftsmen for later polishing and trimming, thus consuming a large amount of manpower. Those that are easy to cast are not easy to print, and the printing success rate is very low, seriously affecting production efficiency. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a lost-wax casting 3D photosensitive resin, a preparation method thereof, and an application thereof. The lost-wax casting 3D photosensitive resin provided by the present invention has high printing accuracy, less ash residue, and low odor during casting.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a lost-wax casting 3D photosensitive resin, comprising the following raw materials in parts by mass:

[0007] 50-95 parts of methacrylate oligomer,

[0008] 0.5-45 parts of methacrylate monomer,

[0009] 0.1-5 parts of photoinitiator,

[0010] 0.2-1 part of coupling agent;

[0011] The methacrylate oligomer includes polytetrahydrofuran and / or polyether methacrylate;

[0012] The methacrylate monomer includes difunctional methacrylate monomer and trifunctional methacrylate monomer.

[0013] Preferably, the difunctional methacrylate monomer includes one or more of 1,4-butanediol dimethacrylate, ethoxylated bisphenol A dimethacrylate, neopentyl glycol dimethacrylate, ethoxylated bisphenol A dimethacrylate, and polyethylene glycol dimethacrylate.

[0014] Preferably, the trifunctional methacrylate monomer includes ethoxylated trimethylolpropane trimethacrylate.

[0015] Preferably, the photoinitiator includes one or more of 1-hydroxy-cyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, bis(2,4,6-trimethylbenzoyl)phenyl phosphine oxide, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, and isopropyl thioxanthone.

[0016] Preferably, the coupling agent includes a silane coupling agent.

[0017] Preferably, the viscosity of the methacrylate oligomer is 200-300 cps.

[0018] The present invention also provides a preparation method of the lost-wax casting 3D photosensitive resin described in the above technical solution, comprising the following steps:

[0019] Mix the methacrylate oligomer, methacrylate monomer, photoinitiator, and coupling agent to obtain the lost-wax casting 3D photosensitive resin.

[0020] Preferably, the temperature of the mixing is 40-50 °C.

[0021] Preferably, the mixing is carried out under stirring; the stirring rate is 500 - 1000 r / min.

[0022] The present invention also provides the use of the investment casting 3D photosensitive resin described in the above technical solution or the investment casting 3D photosensitive resin prepared by the preparation method described in the above technical solution in 3D printing wax molds.

[0023] The present invention provides an investment casting 3D photosensitive resin, comprising the following raw materials in parts by mass: 50 - 95 parts of methacrylate oligomer, 0.5 - 45 parts of methacrylate monomer, 0.1 - 5 parts of photoinitiator, 0.2 - 1 part of coupling agent; the methacrylate oligomer includes polytetrahydrofuran and / or polyether methacrylate; the methacrylate monomer includes difunctional methacrylate monomer and trifunctional methacrylate monomer.

[0024] The methacrylate oligomer adopted in the present invention contains a large number of methyl groups. The steric hindrance effect of the methyl groups can reduce the shrinkage rate after curing, improve the hardness and precision of the wax mold; polytetrahydrofuran can improve the flexibility of the wax mold after curing, endow the wax mold with better physical and mechanical properties, and is beneficial to the subsequent casting process. The difunctional methacrylate monomer has the effect of reducing the viscosity of the system, thereby improving the fluidity of the investment casting 3D photosensitive resin, and at the same time can also adjust the ratio of the oligomer and the reactive monomer, improving the printing success rate. The trifunctional methacrylate monomer has a high reaction activity and a fast curing speed during printing, can quickly increase the initial strength during printing, is beneficial to 3D printing forming, and improves the printing precision. In addition, the oligomer and the reactive monomer are the main components constituting the investment casting 3D photosensitive resin provided by the present invention, which not only affect the printing effect but also the casting effect, and have a significant impact on the ash content and odor during investment casting. While using oligomers and reactive monomers without heteroelements in the present invention, the use of additives is also reduced, thereby achieving the effects of less ash residue after burning and less odor during burning. Description of the Drawings

[0025] Figure 1 It is a comparison diagram of three wax mold manufacturing methods;

[0026] Figure 2 It is a diagram of the wax mold and casting prepared in Application Example 1;

[0027] Figure 3 It is a diagram of the wax mold and casting prepared in Application Example 2;

[0028] Figure 4 It is a diagram of the wax mold and casting prepared in Application Example 3. Detailed Embodiments

[0029] The present invention provides an investment casting 3D photosensitive resin, comprising the following raw materials in parts by mass:

[0030] 50 - 95 parts of methacrylate oligomer,

[0031] 0.5 - 45 parts of methacrylate monomer,

[0032] 0.1 - 5 parts of photoinitiator,

[0033] 0.2 - 1 part of coupling agent;

[0034] The methacrylate oligomer includes polytetrahydrofuran and / or polyether methacrylate;

[0035] The methacrylate monomer includes difunctional methacrylate monomer and trifunctional methacrylate monomer.

[0036] Unless otherwise specified, the present invention has no special requirements for the sources of the raw materials used, and commercially available products well-known to those skilled in the art can be used.

[0037] The lost-wax casting 3D photosensitive resin provided by the present invention includes 50 - 95 parts by mass of methacrylate oligomer, preferably 80 - 95 parts.

[0038] In the present invention, the methacrylate oligomer includes polytetrahydrofuran and / or polyether methacrylate, more preferably polytetrahydrofuran and polyether methacrylate; the mass ratio of polytetrahydrofuran to polyether methacrylate is preferably (0 - 50):(40 - 90), more preferably (20 - 40):(40 - 70).

[0039] In the present invention, the methacrylate oligomer preferably further includes a diluent monomer; the diluent monomer is preferably a difunctional methacrylate; the difunctional methacrylate preferably includes one or more of 1,4-butanediol dimethacrylate, ethoxylated bisphenol A dimethacrylate, neopentyl glycol dimethacrylate, and polyethylene glycol dimethacrylate, more preferably neopentyl glycol dimethacrylate and / or polyethylene glycol dimethacrylate; the ethoxylated bisphenol A dimethacrylate preferably includes one or more of 10E0 type ethoxylated bisphenol A dimethacrylate, 20E0 type ethoxylated bisphenol A dimethacrylate, and 30E0 type ethoxylated bisphenol A dimethacrylate, more preferably 20E0 type ethoxylated bisphenol A dimethacrylate and / or 30E0 type ethoxylated bisphenol A dimethacrylate; the polyethylene glycol dimethacrylate preferably includes 400 type polyethylene glycol dimethacrylate and / or 600 type polyethylene glycol dimethacrylate, more preferably 600 type polyethylene glycol dimethacrylate; when there are multiple difunctional methacrylates, the present invention has no special limitation on the ratio of different types of difunctional methacrylates, and any ratio can be used.

[0040] The polyether methacrylate used in the present invention contains a methyl group. The steric effect of the methyl group can reduce the shrinkage rate after curing, and improve the hardness and precision of the wax mold. Poly(tetrahydrofuran) can improve the flexibility of the cured wax mold, endow the wax mold with better physical and mechanical properties, and is beneficial to the subsequent casting process. The difunctional methacrylate monomer, as a diluent in the methacrylate oligomer, can reduce the viscosity of the mixed oligomer on the one hand, and on the other hand, increase the methyl content in the mixed oligomer, which helps to improve the hardness and precision of the cured wax mold.

[0041] In the present invention, the viscosity of the methacrylate oligomer is preferably 200-300 cps, more preferably 280-300 cps. The present invention has no special limitation on the dosage of the diluent monomer, as long as the viscosity of the methacrylate oligomer can meet the aforementioned requirements.

[0042] In the present invention, the preparation method of the methacrylate oligomer is preferably: mixing poly(tetrahydrofuran) and / or polyether methacrylate, and a diluent monomer, and stirring to obtain a methacrylate oligomer.

[0043] In the present invention, the stirring rate is preferably 500 r / min; the stirring time is preferably 1-3 h, more preferably 2-3 h.

[0044] Based on 1 part by mass of the methacrylate oligomer in the lost-wax casting 3D photosensitive resin, the lost-wax casting 3D photosensitive resin provided by the present invention includes 0.5-45 parts by mass of a methacrylate monomer, preferably 0.5-20 parts.

[0045] In the present invention, the methacrylate monomer includes a difunctional methacrylate monomer and a trifunctional methacrylate monomer; the difunctional methacrylate monomer preferably includes one or more of 1,4-butanediol dimethacrylate, ethoxylated bisphenol A dimethacrylate, neopentyl glycol dimethacrylate, ethoxylated bisphenol A dimethacrylate, and polyethylene glycol dimethacrylate, more preferably neopentyl glycol dimethacrylate and / or polyethylene glycol dimethacrylate; the ethoxylated bisphenol A dimethacrylate preferably includes one or more of 10E0 type ethoxylated bisphenol A dimethacrylate, 20E0 type ethoxylated bisphenol A dimethacrylate, and 30E0 type ethoxylated bisphenol A dimethacrylate, more preferably 20E0 type ethoxylated bisphenol A dimethacrylate and / or 30E0 type ethoxylated bisphenol A dimethacrylate; the polyethylene glycol dimethacrylate preferably includes 400 type polyethylene glycol dimethacrylate and / or 600 type polyethylene glycol dimethacrylate, more preferably 600 type polyethylene glycol dimethacrylate; when there are multiple difunctional methacrylate monomers, the present invention has no special limitation on the ratio of different types of difunctional methacrylate monomers, and any ratio is acceptable.

[0046] In the present invention, the trifunctional methacrylate monomer preferably includes ethoxylated trimethylolpropane trimethacrylate; the ethoxylated trimethylolpropane trimethacrylate preferably includes 9E0 type ethoxylated trimethylolpropane trimethacrylate and / or 30E0 type ethoxylated trimethylolpropane trimethacrylate; when there are multiple trifunctional methacrylate monomers, the present invention has no special limitation on the ratio of different types of difunctional methacrylate monomers, and any ratio is acceptable.

[0047] In the present invention, the mass ratio of the difunctional methacrylate monomer to the trifunctional methacrylate monomer is preferably (10 - 60):(1 - 15), more preferably (10 - 30):(1 - 10).

[0048] In the present invention, the difunctional methacrylate monomer has the effect of reducing the viscosity of the system, thereby improving the fluidity of the lost-wax casting 3D photosensitive resin. At the same time, it can also adjust the ratio of the oligomer and the reactive monomer in the material, improving the printing success rate. The trifunctional methacrylate monomer has a high reaction activity and a fast curing speed during printing, which can quickly increase the initial strength during printing and is beneficial to 3D printing forming.

[0049] Based on 1 part by mass of the methacrylate oligomer in the lost-wax casting 3D photosensitive resin, the lost-wax casting 3D photosensitive resin provided by the present invention includes 0.1 - 5 parts by mass of a photoinitiator, preferably 1 - 3 parts.

[0050] In the present invention, the photoinitiator preferably includes one or more of 1-hydroxy-cyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, bis(2,4,6-trimethylbenzoyl)phenyl phosphine oxide, 2-phenylbenzyl-2-dimethylamino-1-(4-morpholinobenzylphenyl)butanone, and isopropyl thioxanthone, and more preferably 1-hydroxy-cyclohexyl phenyl ketone or 2,4,6-trimethylbenzoyl diphenyl phosphine oxide. When there are multiple photoinitiators, the present invention has no special limitation on the ratio of different types of photoinitiators, and any ratio is acceptable.

[0051] Based on 1 part by mass of the methacrylate oligomer in the investment casting 3D photosensitive resin, the investment casting 3D photosensitive resin provided by the present invention includes 0.2 to 1 part by mass of a coupling agent, preferably 0.2 to 0.5 part by mass.

[0052] In the present invention, the coupling agent is preferably a silane coupling agent; the silane coupling agent can increase the water resistance of the resin and the adhesion to the printing substrate, which is beneficial to improving the printing success rate. The silane coupling agent preferably includes KH-570 coupling agent and / or KH-560 coupling agent, and more preferably KH-570 coupling agent or KH-560 coupling agent. When there are multiple coupling agents, the present invention has no special limitation on the ratio of different types of coupling agents, and any ratio is acceptable.

[0053] The present invention increases the water resistance of the resin itself and the adhesion to the printing substrate through the coupling agent, which is beneficial to improving the printing success rate.

[0054] Based on 1 part by mass of the methacrylate oligomer in the investment casting 3D photosensitive resin, the investment casting 3D photosensitive resin provided by the present invention also preferably includes 0.01 to 0.5 part by mass of a dye, preferably 0.01 to 0.05 part by mass.

[0055] The present invention has no special limitation on the color of the dye, and it can be selected according to actual needs.

[0056] Both the photoinitiator and the dye have ultraviolet absorption functions, but their absorption bands are not exactly the same. While adjusting the color, it is also necessary to adjust the relative ratio of the photoinitiator and the dye to control the printing layer thickness. The higher the content of the photoinitiator, the worse the deep curing; the lower its content, the better the deep curing. The curing depth is adjusted by adjusting the dosage of the photoinitiator. And the more the content of the dye, the worse the light absorption and the weaker the penetration of the investment casting 3D photosensitive resin, the shallower the curing and the worse the deep curing; on the contrary, the smaller the content, the better the penetration and the better the deep curing effect. Reasonably adjust the ratio of the two to achieve the purpose of controlling the layer thickness, improve the printing accuracy at the same time, and endow the wax mold with vivid printing details.

[0057] During the production of the auxiliary agent, catalysts and the like are inevitably used, which increases the ash content after combustion and affects the surface effect of the casting. Moreover, elements such as halogen (fluorine, chlorine, bromine, iodine), nitrogen, sulfur, and phosphorus commonly found in organic substances will produce strong pungent odors during combustion and even have a flame retardant effect, and are prone to ash residue. In the present invention, oligomers and reactive monomers without impurity elements are used, and at the same time, the use of the auxiliary agent is reduced, so as to achieve the effects of less ash residue after combustion and less odor during combustion.

[0058] The present invention also provides a preparation method of the lost-wax casting 3D photosensitive resin described in the above technical solution, including the following steps:

[0059] Mix the methacrylate oligomer, methacrylate monomer, photoinitiator and coupling agent to obtain the lost-wax casting 3D photosensitive resin.

[0060] In the present invention, the temperature of the mixing is preferably 40-50°C, more preferably 45-50°C; the mixing is preferably carried out under stirring conditions; the stirring rate is preferably 500-1000 r / min, more preferably 800-1000 r / min.

[0061] In the present invention, the mixing process is preferably to carry out the first stirring on the methacrylate oligomer and methacrylate monomer, then add the photoinitiator and carry out the second stirring, and then add the coupling agent and carry out the third stirring.

[0062] In the present invention, the time of the first stirring is preferably 1-1.5 h, more preferably 1.2-1.5 h; the time of the second stirring is preferably 0.5-1 h, more preferably 0.5-0.8 h; the time of the third stirring is preferably 0.5-1 h, more preferably 0.8-1 h.

[0063] When the lost-wax casting 3D photosensitive resin includes a dye, the present invention preferably adds the dye after the third stirring and carries out the fourth stirring; the time of the fourth stirring is preferably 0.5-1 h, more preferably 0.8-1 h.

[0064] After the mixing, the present invention preferably filters the obtained mixture; the equipment used for the filtering is preferably a 150-200 mesh filter screen, more preferably a 200 mesh filter screen.

[0065] The present invention also provides an application of the lost-wax casting 3D photosensitive resin described in the above technical solution or the lost-wax casting 3D photosensitive resin prepared by the preparation method described in the above technical solution in 3D printing wax molds.

[0066] The present invention has no special limitation on the application method of the lost-wax casting 3D photosensitive resin in 3D printing wax molds, and the well-known application methods in the art can be adopted.

[0067] In the application example of the present invention, the application method is specifically 3D printing.

[0068] In the present invention, the dimensional deviation of the wax mold obtained by 3D printing is preferably ≤0.05 mm; the layer thickness of 3D printing is ≤0.03 mm; the printing temperature of 3D printing is preferably 25 °C. When the room temperature is 25 °C, taking the wax mold printed by Novatech industrial machine color screen LCD printer as an example, the printing parameters of 3D printing: the printing layer thickness is preferably 0.03 mm / 10 s. When the room temperature is 30 °C, the printing layer thickness is preferably 0.03 mm / 9 s.

[0069] The printing process is an exothermic process. As the temperature rises, the temperature of the resin in the material tank also rises, the activity increases, and the printing accuracy is affected. As the temperature increases, the activity of the resin increases, the reaction speed increases, and the printing time needs to be adjusted to ensure the accuracy. In winter, when the temperature is too low, it also affects printing, and the printing parameters also need to be adjusted.

[0070] While improving the printing accuracy by controlling the printing layer thickness, the present invention can reduce layer lines and save the subsequent polishing time.

[0071] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention, but they cannot be understood as limiting the protection scope of the present invention.

[0072] Example 1

[0073] Mix 30 parts of polytetrahydrofuran, 30 parts of polyether methacrylate, and 40 parts of the diluent monomer neopentyl glycol dimethacrylate, and stir at 500 r / min for 3 h to obtain a methacrylate oligomer (the viscosity measured by a digital display rotational viscometer is 300 cps);

[0074] Take 94 parts of the above methacrylate oligomer and add it to a stirring kettle. Then add 2.45 parts of ethoxylated (9EO) trimethylolpropane trimethacrylate. Stir at a speed of 800 r / min at 40-50 °C for 1 h. Then add 2 parts of the photoinitiator 1-hydroxy-cyclohexyl phenyl ketone and 1 part of 2,4,6-trimethylbenzoyl diphenyl phosphine oxide (TPO). After stirring for 1 h, add 0.5 part of KH-570 coupling agent and continue to stir for 0.5 h. Finally, add 0.05 part of blue dye and continue to stir for 1 h. After filtering through a 200-mesh filter screen, the material is discharged to obtain a 3D photosensitive resin for investment casting.

[0075] Example 2

[0076] Mix 20 parts of polytetrahydrofuran, 40 parts of polyether methacrylate, and 40 parts of the diluent monomer neopentyl glycol dimethacrylate, and stir at 500 r / min for 3 h to obtain a methacrylate oligomer (viscosity measured by a digital display rotational viscometer: 280 cps).

[0077] Add 80 parts of the above methacrylate oligomer to a stirring kettle, then add 5 parts of ethoxylated (9E0) trimethylolpropane trimethacrylate and 11.46 parts of ethoxylated (10E0) bisphenol A dimethacrylate. Stir at 800 r / min for 1 h at 40 - 50 °C, then add 2 parts of the photoinitiator 1-hydroxy-cyclohexyl phenyl ketone (184) and 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide (TPO). After stirring for 1 h, add 0.5 part of KH-570 coupling agent and continue stirring for 0.5 h. Finally, add 0.04 part of green dye, continue stirring for 1 h, filter through a 200-mesh filter screen and then discharge to obtain a lost-wax casting 3D photosensitive resin.

[0078] Example 3

[0079] Mix 10 parts of polytetrahydrofuran, 40 parts of polyether methacrylate, and 50 parts of the diluent monomer neopentyl glycol dimethacrylate, and stir at 500 r / min for 3 h to obtain a methacrylate oligomer (viscosity measured by a digital display rotational viscometer: 250 cps).

[0080] Add 50 parts of the above methacrylate oligomer to a stirring kettle, then add 10 parts of ethoxylated (9E0) trimethylolpropane trimethacrylate and 35.47 parts of ethoxylated (10E0) bisphenol A dimethacrylate. Stir at 800 r / min for 1 h at 40 - 50 °C, then add 2 parts of the photoinitiator 1-hydroxy-cyclohexyl phenyl ketone (184) and 2 parts of 2,4,6-trimethylbenzoyl diphenylphosphine oxide (TPO). Continue stirring for 1 h, then add 0.5 part of KH-570 coupling agent and continue stirring for 0.5 h. Finally, add 0.03 part of green dye, continue stirring for 1 h, filter through a 200-mesh filter screen and then discharge to obtain a lost-wax casting 3D photosensitive resin.

[0081] Application Examples 1 - 3

[0082] Add 200 mL of the lost-wax casting 3D photosensitive resins prepared in Examples 1 - 3 to the trough of a Nova industrial color screen LCD printer respectively, let it stand for 15 min, and after the bubbles disappear, conduct 3D printing. Control the size deviation of the wax mold within 0.05 mm and the printing layer thickness at 0.03 mm per layer to obtain a wax mold (as Figures 2 to 4 shown), and then conduct lost-wax casting. After the casting is completed and the gypsum is washed off, obtain a casting without manual treatment (asFigures 2 to 4 as shown

[0083] Performance test

[0084] The performance of the wax patterns obtained from Application Examples 1 to 3 was tested, and the results are shown in Table 1.

[0085] Table 1 Performance of the wax patterns obtained from Application Examples 1 to 3

[0086] Application example Ash residue Printing precision Situation after combustion 1 None 0.03 mm / 10 s Small combustion odor and small black smoke 2 0.01％ 0.03 mm / 10 s Small combustion odor and slightly larger black smoke 3 0.02％ 0.03 mm / 10 s Small combustion odor and slightly larger black smoke

[0087] As can be seen from Table 1, the investment casting 3D photosensitive resin provided by the present invention has less ash residue, high printing accuracy, low burning odor, and less black smoke generated during burning in the wax patterns manufactured by 3D printing.

[0088] Although the above embodiments have described the present invention in detail, they are only a part rather than all of the embodiments of the present invention. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A lost-wax casting 3D photosensitive resin, characterized in that, It consists of raw materials in the following parts by mass: 50 - 95 parts of methacrylate oligomer, 0.5 - 45 parts of methacrylate monomer, 0.1 - 5 parts of photoinitiator, 0.2 - 1 part of coupling agent; The methacrylate oligomer is composed of polytetrahydrofuran, polyether methacrylate and diluent monomer; the diluent monomer is difunctional methacrylate; the difunctional methacrylate is composed of one or more of 1,4 - butanediol dimethacrylate, ethoxylated bisphenol A dimethacrylate, neopentyl glycol dimethacrylate and polyethylene glycol dimethacrylate; The viscosity of the methacrylate oligomer is 200 - 300 cps; The methacrylate monomer is composed of difunctional methacrylate monomer and trifunctional methacrylate monomer; The coupling agent is a silane coupling agent.

2. The lost-wax casting 3D photosensitive resin according to claim 1, wherein The difunctional methacrylate monomer includes one or more of 1,4 - butanediol dimethacrylate, ethoxylated bisphenol A dimethacrylate, neopentyl glycol dimethacrylate, ethoxylated bisphenol A dimethacrylate and polyethylene glycol dimethacrylate.

3. The lost wax casting 3D photosensitive resin according to claim 1, characterized in that, The trifunctional methacrylate monomer includes ethoxylated trimethylolpropane trimethacrylate.

4. The lost wax casting 3D photosensitive resin according to claim 1, wherein The photoinitiator includes one or more of 1 - hydroxy - cyclohexyl phenyl ketone, 2,4,6 - trimethylbenzoyl diphenylphosphine oxide, bis(2,4,6 - trimethylbenzoyl)phenylphosphine oxide, 2 - benzyl - 2 - dimethylamino - 1 - (4 - morpholinobenzylphenyl)butanone and isopropylthioxanthone.

5. The preparation method of the investment casting 3D photosensitive resin according to any one of claims 1 - 4, comprising the following steps: Mix the methacrylate oligomer, methacrylate monomer, photoinitiator and coupling agent to obtain the investment casting 3D photosensitive resin.

6. The preparation method according to claim 5, characterized in that, The temperature of the mixing is 40 - 50 °C.

7. The preparation method according to claim 5, characterized in that, The mixing is carried out under stirring; the stirring rate is 500 - 1000 r / min.

8. The application of the investment casting 3D photosensitive resin according to any one of claims 1 - 4 or the investment casting 3D photosensitive resin prepared by the preparation method according to any one of claims 5 - 7 in 3D printing wax molds.

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