Rapid alcohol-soluble 3D printing support material based on MJP technology, preparation and application

Abstract

The invention belongs to the technical field of 3D printing materials, and particularly relates to a rapid alcohol-soluble 3D printing supporting material based on an MJP technology, preparation and application, and the rapid alcohol-soluble 3D printing supporting material is mainly used for supporting forming and efficient removal of complex structural parts. The material is prepared by taking a composite material of polyethylene glycol (PEG), polyvinylpyrrolidone (PVP) and cetanol as an alcohol-soluble base material and supplementing a viscosity modifier, a filler and a functional additive through a specific ratio and a specific process. The supporting material adopts a synergistic effect of a polyethylene glycol base material and an alcohol-soluble toughening agent, and the supporting structure can be quickly dissolved in an alcohol solvent (less than or equal to 30 minutes), so that the surface of a printed piece is effectively prevented from being damaged; the rheological property is optimized through the viscosity modifier, the plug or soft collapse phenomenon is prevented, and high printing stability is achieved; and the material and the cleaning waste liquid are biodegradable, so that the green manufacturing requirement is met.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing materials technology, specifically relating to a rapid alcohol-soluble 3D printing support material based on MJP technology, its preparation and application. Background Technology

[0002] MultiJet Printing (MJP) is a 3D printing technology that utilizes the principle of photopolymerization. It precisely deposits droplets of photosensitive resin through a multi-nozzle nozzle, which are then cured layer by layer by ultraviolet light to form the final shape. This technology uses a soluble wax material as a support structure, enabling the creation of complex geometries and internal cavities. A smooth surface is achieved by dissolving the support material during post-processing. Due to its high precision and ability to manufacture complex geometries, MJP technology is widely used in the fabrication of complex structural components such as biosensors, lab-grown chips, medical models, and dental models.

[0003] In the 3D printing process, support materials play a crucial role, being indispensable for ensuring the forming accuracy and quality of 3D printed parts. When printing objects with complex structures such as suspensions or voids, support materials form suspended structures on the material surface, shaping specific areas. After printing, the support material can be quickly removed without adversely affecting the main material product. Traditional MJP support materials often rely on water-soluble systems, such as polyvinyl alcohol (PVA) or paraffin wax systems. PVA readily absorbs moisture from the air, causing the material to become sticky after absorbing moisture, affecting print quality and even clogging the nozzle. Therefore, PVA must be stored in a strictly sealed container and may require drying before use. Although PVA is soluble in water, complete dissolution typically takes several hours, especially for complex internal support structures, which may require even longer or higher water temperatures to accelerate dissolution. During the printing process, PVA may not form a strong bond with certain model materials (such as PETG and TPU), leading to unstable support structures or printing failures.

[0004] Rapidly alcohol-soluble support material is a support material that can be rapidly dissolved in specific alcohol solvents. It can provide good support performance during the printing process and can be quickly removed after printing by simple alcohol dissolution, avoiding the residue and damage problems that may occur during the removal of traditional support materials. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a rapid alcohol-soluble 3D printing support material based on MJP technology, its preparation and application.

[0006] To address the aforementioned technical problems and achieve the aforementioned technical effects, one of the objectives of this invention is to provide a rapid alcohol-soluble 3D printing support material based on MJP technology. The supporting material, by weight, consists of the following components: Alcohol-soluble base material: 50-80 parts; Viscosity modifier: 15-25 parts; Filler: 5-25 parts; Functional additives: 0.15 parts.

[0007] Furthermore, the alcohol-soluble base material is prepared by blending polyethylene glycol (PEG), polyvinylpyrrolidone (PVP), and hexadecyl alcohol in a mass ratio of (30-80):(2-10):(20-60).

[0008] Furthermore, the polyethylene glycol is prepared by blending polyethylene glycol wax with liquid polyethylene glycol; the molecular weight of the polyethylene glycol wax is 2000-6000, and the molecular weight of the liquid polyethylene glycol is 400-1000.

[0009] Further, the viscosity modifier is at least one of diethylene glycol, polyethylene glycol dimethyl ether (average molecular weight 440-1500), hydrogenated rosin resin, and hydrogenated petroleum resin; Furthermore, the viscosity modifier is a combination of diethylene glycol and polyethylene glycol dimethyl ether in a mass ratio of 1:(1-3).

[0010] Furthermore, the filler is modified nano-silica; Furthermore, the modified nano-silica is nano-silica modified with ionic liquid, with a particle size of 10-50 nm.

[0011] Furthermore, the ionic liquid is a vinyl-containing ionic liquid; Furthermore, the preparation method of the ethylene-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 10-50 nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in Step 2, the product is filtered, washed, and dried to obtain vinyl ion-modified nano-silica.

[0012] The second objective of this invention is to provide a method for preparing the aforementioned 3D printing support material, comprising the following steps: Step 1: Preparation of alcohol-soluble base material Weigh out polyethylene glycol according to the required ratio and add it to the reaction vessel. Heat it to 100-120℃. After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone. Continue to react at a stirring speed of 600 r / min for 1 hour to ensure that the mixture is fully mixed. Step 2: Add the viscosity modifier to the alcohol-soluble base material that has been mixed evenly in Step 1, and melt-mix it at 100-120℃ with a stirring rate of 500-800 r / min for 0.5 h. Step 3: After stirring, add filler and functional additives, maintain the temperature and stir for 0.5-1 hour. After mixing evenly, filter while hot and cool to form. The filter element pore size is ≤5 μm.

[0013] The third objective of this invention is to provide applications of the aforementioned 3D printing support material, namely, applications in precision casting, jewelry casting, medical devices, and 3D printing of complex aerospace structural parts.

[0014] Furthermore, the application includes the following operational steps: Step 1: Immerse the printed part in the alcohol dissolving solution and sonicate for 10-30 minutes at a frequency of 40-60 kHz. Step 2: The residual support material is removed by secondary alcohol washing or mechanical peeling.

[0015] Furthermore, the alcohol dissolution test solution is prepared by mixing polypropylene glycol, anhydrous ethanol, and isopropanol in a mass ratio of 1:5:5.

[0016] Furthermore, the alcohol-dissolving test solution also contains 0.1-1 wt% of the surfactant sodium dodecylbenzenesulfonate.

[0017] The present invention has the following beneficial effects: (1) This approach involves adding alcohol-soluble base materials, supplemented with viscosity modifiers, fillers, and functional additives, and preparing the material through specific ratios and processes. Multi-component synergistic modification optimizes the comprehensive properties of the support material, including viscosity, toughness, strength, flowability, and alcohol solubility. This successfully develops a support material with low shrinkage and high strength, whose performance indicators meet the requirements of 3D printing processes, providing technical support for the industrialization of domestically produced support materials. Specifically: (2) Due to the poor adhesion and rough surface of the PEG composite system, the overall effect will be affected during use. The addition of viscosity modifier can strengthen the interfacial interaction, ensure the dimensional stability of the support structure during molding, and effectively improve the adhesion of the overall material, thereby improving the hardness, strength and surface smoothness of the overall material. The addition of ethylene ionic liquid modified nano-silica filler can not only adjust the rheological behavior of the system, but also improve the overall strength of the material and ensure the stability of the support. Attached Figure Description

[0018] Figure 1 This is the infrared spectrum analysis diagram of the alcohol-soluble base material of the present invention.

[0019] Figure 2 The above are DSC diagrams of the support material with 15% and 20% filler content according to the present invention.

[0020] Figure 3 This is a graph showing the alcohol solubility of the support material sample of the present invention. Detailed Implementation

[0021] The following will be combined with the appendix Figure 1-3 The embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Unless otherwise specified, all raw materials used in the following embodiments are commercially available.

[0023] Example 1: 80 parts of alcohol-soluble base material: including 56.6 parts of polyethylene glycol wax (molecular weight 4000), 23.4 parts of liquid PEG400, 2 parts of PVP, and 20 parts of hexadecanoic acid; 15 parts viscosity modifier; 5 parts of filler; 0.15 parts functional additives Weigh out polyethylene glycol according to the predetermined ratio and add it to the reaction vessel. Heat to 100-120℃ (the temperature should be appropriately increased depending on the increase of PVP content). After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone. Continue the reaction at a stirring speed of 600 r / min for 1 hour to ensure thorough mixing and obtain an alcohol-soluble base material (such as...). Figure 1 ); Add 15 parts of viscosity modifier (diethylene glycol to polyethylene glycol dimethyl ether in a 1:1 ratio) to 80 parts of alcohol-soluble base material that have been mixed evenly, melt mix at 100°C, stir at 500 r / min for 0.5 h, add 5 parts of vinyl ionic liquid modified nano silica and 0.15 parts of functional additives, maintain the temperature and stir for 0.5 h, mix evenly and filter while hot (filter pore size ≤ 5 μm), cool and shape.

[0024] The preparation method of the vinyl-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 30nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in step 2, filter, wash and dry the product to obtain vinyl ion-modified nano-silica.

[0025] Example 2: Alcohol-soluble base material 70 parts: polyethylene glycol wax (molecular weight 4000) 46.2 parts, liquid PEG600 19.8 parts, PVP 4 parts, 16-alkyl alcohol 30 parts; 20 parts viscosity modifier; 10 parts of packing material; 0.15 parts of functional additives; Add the weighed polyethylene glycol according to the predetermined ratio to the reaction vessel and heat it to 100-120℃ (the temperature should be appropriately increased according to the increase of PVP content). After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone and continue to react for 1 hour at a stirring speed of 600 r / min to make it fully mixed and uniform to obtain alcohol-soluble base material. Add 20 parts of viscosity modifier (diethylene glycol to polyethylene glycol dimethyl ether in a 1:1 ratio) to 70 parts of alcohol-soluble base material that have been mixed evenly, melt mix at 100°C, stir at 600 r / min for 0.5 h, add 10 parts of vinyl ionic liquid modified nano silica and 0.15 parts of functional additives, maintain the temperature and stir for 0.5 h, mix evenly and filter while hot (filter pore size ≤ 5 μm), cool and shape.

[0026] The preparation method of the vinyl-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 30nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in step 2, filter, wash and dry the product to obtain vinyl ion-modified nano-silica.

[0027] Example 3: Alcohol-soluble base material 70 parts: polyethylene glycol wax (molecular weight 2000) 27.8 parts, liquid PEG600 16.2 parts, PVP 6 parts, 16-alkyl alcohol 40 parts; 20 parts viscosity modifier; 15 parts of filler; 0.15 parts of functional additives; Add the weighed polyethylene glycol according to the predetermined ratio to the reaction vessel and heat it to 100-120℃ (the temperature should be appropriately increased according to the increase of PVP content). After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone and continue to react for 1 hour at a stirring speed of 600 r / min to make it fully mixed and uniform to obtain alcohol-soluble base material. Add 20 parts of viscosity modifier (diethylene glycol to polyethylene glycol dimethyl ether in a 1:1 ratio) to 70 parts of pre-mixed alcohol-soluble base material, melt mix at 100℃ with a stirring rate of 600 r / min for 0.5 h, then add 15 parts of vinyl ionic liquid-modified nano-silica and 0.15 parts of functional additives, maintain the temperature and stir for 0.5 h, mix thoroughly, filter while hot (filter pore size ≤ 5 μm), and cool to form. Figure 2 (This is a DSC diagram of the support material with 15% filler content according to the present invention).

[0028] The preparation method of the vinyl-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 30nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in step 2, filter, wash and dry the product to obtain vinyl ion-modified nano-silica.

[0029] Example 4: Alcohol-soluble base material (60 parts): 29.4 parts polyethylene glycol wax (molecular weight 1500), 12.6 parts liquid PEG1000, 8 parts PVP, and 50 parts hexadecyl alcohol; 20 parts viscosity modifier; 20 parts of filler; 0.15 parts of functional additives; Add the weighed polyethylene glycol according to the predetermined ratio to the reaction vessel and heat it to 100-120℃ (the temperature should be appropriately increased according to the increase of PVP content). After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone and continue to react for 1 hour at a stirring speed of 600 r / min to make it fully mixed and uniform to obtain alcohol-soluble base material. Add 20 parts of viscosity modifier (diethylene glycol to polyethylene glycol dimethyl ether in a 1:1 ratio) to 60 parts of pre-mixed alcohol-soluble base material, melt mix at 120℃ with a stirring rate of 700 r / min for 0.5 h, then add 20 parts of vinyl ionic liquid-modified nano-silica and 0.15 parts of functional additives, maintain the temperature and stir for 1 h, mix thoroughly, filter while hot (filter pore size ≤ 5 μm), and cool to form. Figure 2 (This is a DSC diagram of the support material with 20% filler content according to the present invention).

[0030] The preparation method of the vinyl-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 30nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in step 2, filter, wash and dry the product to obtain vinyl ion-modified nano-silica.

[0031] Example 5: 50 parts alcohol-soluble base material: 21 parts polyethylene glycol wax (molecular weight 6000), 9 parts liquid PEG400, 10 parts PVP, 60 parts hexadecyl alcohol; 25 parts viscosity modifier; 25 parts of filler; 0.15 parts of functional additives; Add the weighed polyethylene glycol according to the predetermined ratio to the reaction vessel and heat it to 100-120℃ (the temperature should be appropriately increased according to the increase of PVP content). After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone and continue to react for 1 hour at a stirring speed of 600 r / min to make it fully mixed and uniform to obtain alcohol-soluble base material. Add 25 parts of viscosity modifier (diethylene glycol to polyethylene glycol dimethyl ether in a ratio of 1:3) to 50 parts of alcohol-soluble base material that have been mixed evenly, melt mix at 120°C, stir at 800 r / min for 0.5 h, add 25 parts of vinyl ionic liquid modified nano silica and 0.15 parts of functional additives, maintain the temperature and stir for 1 h, mix evenly and filter while hot (filter pore size ≤5 μm), cool and shape.

[0032] The preparation method of the vinyl-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 30nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in step 2, filter, wash and dry the product to obtain vinyl ion-modified nano-silica.

[0033] Comparative Example 1: The only difference between Comparative Example 1 and Example 3 is that the filler used is unmodified nano-silica.

[0034] Comparative Example 2: The only difference between Comparative Example 2 and Example 4 is that the filler used is unmodified nano-silica.

[0035] The performance test results of Examples 1-5 and Comparative Examples 1-2 are shown in Table 1: Table 1. Test results of support material performance As shown in Table 1, using vinyl-containing ionic liquid-modified nano-silica as a filler, its surface is functionalized by ionic liquid, which significantly improves the interfacial compatibility between nano-silica and other components. The nano-silica modified with ionic liquid significantly improves the mechanical strength and deformation resistance of the support material. This invention employs an alcohol-soluble base material to composite polyethylene glycol (PEG), polyvinylpyrrolidone (PVP), and hexadecyl alcohol. The synergistic effect of these three components gives the base material excellent overall performance. PEG, as an alcohol-soluble base material, not only has good water solubility but is also soluble in organic solvents such as benzene, acetonitrile, and ethanol. Its outstanding advantages include broad compatibility with various solvents, a wide viscosity range, good adhesion, thermal stability, and low toxicity, making it an ideal alcohol-soluble base material. The strongly polar carbonyl group (C=O) of polyvinylpyrrolidone (PVP) is connected to the terminal hydroxyl group (-OH) of PEG through dynamic hydrogen bonds, forming a uniformly dispersed intermolecular interaction network, which produces a synergistic intermolecular effect with PEG. The addition of PVP can increase the tensile strength of the composite material by 10 times while lowering the glass transition temperature (Tg), thus enhancing ductility. Introducing specific groups (such as hydroxyl and carboxyl groups) at the ends of hexadecyl alcohol polymer chains can reduce intermolecular interaction forces, optimize melt rheological properties, reduce material viscosity, and ensure the uniformity and continuity of extruded support materials during printing, thereby reducing the possibility of printhead clogging. The hydrophobic alkyl chains of hexadecyl alcohol form local lubricating microregions in the polar network, reducing intermolecular frictional resistance. At the same time, its steric hindrance effect interferes with the extension of PEG chains, reducing physical entanglement density.

[0036] Alcohol solubility test of support material samples, as follows Figure 3 As shown, when printed parts using the 3D printing support material described in this embodiment are immersed in an alcohol-soluble solution (polypropylene glycol: anhydrous ethanol: isopropanol mixed in a 1:5:5 ratio, with 0.1-1% sodium dodecylbenzenesulfonate surfactant added), and ultrasonically treated (frequency 40-60 kHz) for 10-30 minutes, the support structure dissolves rapidly without leaving any residue, and the surface of the printed parts maintains a good surface finish. This is due to the introduction of vinyl ionic liquid-modified nano-silica filler into the alcohol-soluble base material. The rigid nano-silica particles act as "physical cross-linking points" in the polymer matrix. When the material is immersed in the alcohol solution, the solvent tends to preferentially penetrate along the interface between the filler and the polymer. The uniformly dispersed nano-filler forms a three-dimensional penetration network channel throughout the entire material, allowing ethanol molecules to quickly and deeply penetrate the interior of the material, thereby greatly accelerating the swelling and disintegration process. In addition, ionic liquids themselves, especially imidazole ionic liquids containing alkyl chains, have good compatibility with polar solvents such as ethanol. The modified filler surface is covered with a layer of alcohol-loving ionic liquid. When ethanol comes into contact with the support material, it will preferentially "wet" and "solventize" these ionic liquid regions. This not only accelerates solvent penetration, but may also cause the ionic liquid to "extract" from the interface. The presence of the filler further hinders the tight packing of polymer chains. Amorphous regions are more easily attacked and swollen by solvents, causing the material to rapidly disintegrate from the inside.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid alcohol-soluble 3D printing support material based on MJP technology, characterized in that, The supporting material, by weight, consists of the following components: Alcohol-soluble base material: 50-80 parts; Viscosity modifier: 15-25 parts; Filler: 5-25 parts; Functional additives: 0.15 parts.

2. The 3D printing support material according to claim 1, characterized in that, The alcohol-soluble base material is prepared by blending polyethylene glycol, polyvinylpyrrolidone, and hexadecyl alcohol in a mass ratio of (30-80):(2-10):(20-60).

3. The 3D printing support material according to claim 2, characterized in that, The polyethylene glycol is prepared by blending polyethylene glycol wax with liquid polyethylene glycol; the molecular weight of the polyethylene glycol wax is 2000-6000, and the molecular weight of the liquid polyethylene glycol is 400-1000.

4. The 3D printing support material according to claim 1, characterized in that, The viscosity modifier is at least one of diethylene glycol, polyethylene glycol dimethyl ether, hydrogenated rosin resin, and hydrogenated petroleum resin.

5. The 3D printing support material according to claim 1, characterized in that, The filler is ethylene-containing ionic liquid-modified nano-silica, and the preparation method of the ethylene-containing ionic liquid-modified nano-silica includes the following steps: Step 1: Add 5g of 1-vinyl-3-butylimidazolium bromide to anhydrous ethanol and stir until completely dissolved. Then add 0.1g of azobisisobutyronitrile and stir until homogeneous to form a mixed solution. Step 2: Add 10g of 10-50 nm nano-silica to 80 mL of anhydrous ethanol, sonicate for 20 minutes, and then slowly add the mixed solution prepared in step 1 under nitrogen protection. Stir at 70°C for 5 hours. Step 3: After stirring in step 2, filter, wash and dry the product to obtain vinyl ion-modified nano-silica.

6. The method for preparing the 3D printing support material according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Preparation of alcohol-soluble base material Weigh out polyethylene glycol according to the required ratio and add it to the reaction vessel. Heat it to 100-120℃. After the material melts, add hexadecyl alcohol and polyvinylpyrrolidone. Continue to react at a stirring speed of 600 r / min for 1 hour to ensure that the mixture is fully mixed. Step 2: Add the viscosity modifier to the alcohol-soluble base material that has been mixed evenly in Step 1, and melt-mix it at 100-120℃ with a stirring rate of 500-800 r / min for 0.5 h. Step 3: After stirring, add filler and functional additives, maintain the temperature and stir for 0.5-1 hour. After mixing evenly, filter while hot and cool to form. The filter element pore size is ≤5 μm.

7. The application of the 3D printing support material as described in claims 1-5, characterized in that, The applications are in precision casting, jewelry casting, medical devices, and 3D printing of complex aerospace structural parts.

8. The application of the 3D printing support material as described in claim 6, characterized in that, The operation includes the following steps: Step 1: Immerse the printed part in the alcohol dissolving solution and sonicate for 10-30 minutes at a frequency of 40-60 kHz. Step 2: The residual support material is removed by secondary alcohol washing or mechanical peeling.

9. The application of the 3D printing support material as described in claim 8, characterized in that, The alcohol dissolution test solution was prepared by mixing polypropylene glycol, anhydrous ethanol and isopropanol in a mass ratio of 1:5:

5.

10. The application of the 3D printing support material as described in claim 8, characterized in that, The alcohol-dissolving test solution also contains 0.1-1 wt% of the surfactant sodium dodecylbenzenesulfonate.

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