Shape memory self-repairing 3D printing ink and preparation method thereof

Abstract

The invention relates to the technical field of 3D printing, and discloses a shape memory self-repairing 3D printing ink and a preparation method, through carefully selecting a shape memory material and a self-repairing material, the 3D printing ink provided by the invention realizes a shape memory function of an object under specific conditions, so that the printed object can be recovered to a preset shape; and unique advantages in intelligent materials and dynamic structure applications are shown. Meanwhile, a self-repairing material in the ink formula is combined with a repairing reinforcing material, so that the 3D printed object is endowed with the self-repairing capability, the performance reduction caused by slight damage is effectively reduced, and the reliability and durability of the 3D printed object in long-term use are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a shape memory self-repairing 3D printing ink and a preparation method thereof. Background Art

[0002] 3D printing technology is widely used in various industries, including aerospace, automobile manufacturing, medical devices, etc., for its rapid prototyping and design flexibility. However, existing 3D printing materials usually show high hardness and brittleness after curing. Although this high hardness is conducive to the stability of the structure, it also makes the printed entity more susceptible to damage when bumped or impacted. For example, plastic materials such as ABS and PLA have relatively low hardness, while metal materials such as stainless steel and titanium alloy have high hardness and high strength.

[0003] Although the hardness of these materials is necessary in some applications, in other applications that require flexibility and impact resistance, excessive hardness becomes a disadvantage. Therefore, while existing 3D printing materials meet some performance requirements, they also expose deficiencies in durability and damage resistance.

[0004] Furthermore, existing 3D printing materials generally lack self-healing capabilities. Once a break or crack occurs, these materials cannot self-repair, resulting in damage to the integrity and functionality of the entire structure. This limitation severely restricts the use of 3D printing technology in application scenarios that require durability and flexibility. For example, in automobile manufacturing, high-performance engine components need to have high hardness and wear resistance, but they also need to be able to self-repair after damage to extend service life and performance. In addition, with the development of 3D printing technology, there is an increasing demand for the versatility and intelligence of materials. For example, shape memory polymers (SMPs) have great application potential in aerospace technology, biomedical equipment and other fields. However, these smart materials often need to be combined with self-healing capabilities in practical applications to improve their stability and reliability in complex environments. Therefore, the development of a 3D printing material that has both appropriate hardness and self-healing capabilities is of great significance for promoting the application of 3D printing technology in a wider range of fields. Summary of the invention

[0005] The purpose of the present invention is to provide a shape memory self-repairing 3D printing ink and a preparation method to meet the requirements of high flexibility and self-repairing ability and improve the durability and reliability of 3D printed objects.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention discloses a shape memory self-repairing 3D printing ink, which comprises at least the following components:

[0007] Shape memory and reinforcement components, 15% to 25% by mass;

[0008] Self-repairing and reinforcing components, 10% to 20% by mass;

[0009] Photocurable monomer, 25% to 35% by mass;

[0010] Photoinitiator, 0.5% to 2% by weight;

[0011] Auxiliary agent, the mass percentage is 5% to 10%, and the rest is solvent;

[0012] Among them, the shape memory and reinforcement components include shape memory materials and memory reinforcement materials, and the self-repairing and reinforcement components include self-repairing materials and repair reinforcement materials.

[0013] Furthermore, the “shape memory material and memory enhancement material” are:

[0014] The shape memory material is a mixture of poly(N-isopropylacrylamide) and / or poly(acrylic acid-co-acrylamide) and polyvinyl alcohol / polyvinyl pyrrolidone copolymer and / or polycaprolactone;

[0015] The memory enhancement material is one or a mixture of poly(N,N-dimethylacrylamide), poly(N-vinylpyrrolidone), and poly(trimethylsiloxane propyl acrylate);

[0016] The mass percentage of the shape memory material is 15% to 20%, the mass percentage of the memory enhancement material is 5% to 10%, and the sum of the two does not exceed 25% of the total mass of the ink.

[0017] Furthermore, the “self-repairing and strengthening components” are:

[0018] The self-healing material is one or a mixture of poly(N-vinyl pyrrolidone), polyethyl dithiocarbamate, and polysulfide;

[0019] The repair and reinforcement material is one or a mixture of polyethylene glycol diacrylate, poly(acrylic acid-sodium acryloyloxyethyl methyl taurate), poly(N-isopropylacrylamide-co-acrylic acid);

[0020] The mass percentage of the self-repairing material is 10% to 15%, the mass percentage of the repairing and enhancing material is 5% to 10%, and the sum of the two does not exceed 20% of the total mass of the ink.

[0021] Wherein, the photocurable monomer is one or a mixture of ethyl acrylate, 2-hydroxyethyl acrylate, glycerol triacrylate or ethylene glycol tetraacrylate;

[0022] The photoinitiator is one or a mixture of benzoylmethane, 2-hydroxy-2-methyl-1-phenylacetone, 1-hydroxycyclohexyl benzophenone or 2,4,6-trimethylbenzoylphenylphosphine oxide.

[0023] Wherein, the auxiliary agent at least includes:

[0024] Stabilizer, mass percentage is 0.01% to 0.2%; defoamer, mass percentage is 0.01% to 0.2%;

[0025] Dispersant, 0.1% to 1% by mass; Wetting agent, 0.1% to 1% by mass;

[0026] Viscosity modifier, 1% to 3% by mass; surfactant, 0.1% to 0.5% by mass;

[0027] Preservatives, the mass percentage is 0.01% to 0.5%; colorants, the mass percentage is 0.1% to 1%.

[0028] The present invention also discloses a method for preparing shape memory self-repairing 3D printing ink, the preparation method comprising at least the following steps:

[0029] S1. Weighing reaction raw materials based on the above-mentioned shape memory self-repairing 3D printing ink;

[0030] S2, the preparation of shape memory and reinforcing components, adding them into the preparation container according to the mass fraction, and stirring at low speed and low temperature until the mixture is completely dissolved;

[0031] S3, the self-repairing and strengthening components are prepared by adding them into the preparation container according to the mass fraction, and stirring at a low speed and low temperature until the mixture is completely dissolved;

[0032] S4, mixing the shape memory and reinforcement components prepared in S2 with the self-repairing and reinforcement components prepared in S3, adding photocurable monomers and photoinitiators, and adjusting the addition of solvents and additives according to the viscosity and solubility of the mixture;

[0033] S5. Mix and disperse all components until the mixed ink is uniform and consistent without obvious stratification or precipitation;

[0034] S6. Shape memory self-repairing 3D printing ink will eventually be obtained.

[0035] Preferably, the step S5 comprises:

[0036] S51, pre-mixing the mixture prepared in S4 at room temperature and at a low speed of 200-300 rpm for 30-60 min;

[0037] S52, increase to medium speed 500-700rpm, and continue stirring for about 1-2h until the ink is uniform and consistent without obvious stratification or precipitation.

[0038] Furthermore, the step S5 further includes:

[0039] S53, transfer the mixed ink in step S52 into a vacuum degassing device, set the vacuum degree to 0.01-0.05MPa, the temperature to 25-40°C, and the degassing at a low speed of 200-300rpm for 30-60min. 15min before the end of the degassing process, restore the pressure to the same as the external pressure at a uniform speed.

[0040] Furthermore, the step S5 further includes:

[0041] S54, transferring the vacuum degassed ink in step S53 into a membrane filtration device, selecting a filtration membrane with a pore size of 0.1-0.2 microns, and controlling the filtration pressure at 0.1-0.2 MPa.

[0042] The present invention has the following beneficial effects:

[0043] 1. The present invention achieves a perfect combination of shape memory and self-healing functions through a carefully designed ink formula. By selecting appropriate shape memory materials and self-healing materials, the shape memory function of 3D printed objects under specific conditions is achieved. This function enables the printed object to return to a preset shape when subjected to external stimuli, such as temperature changes, thereby showing unique advantages in the application of smart materials and dynamic structures.

[0044] 2. The combination of self-repairing materials and repair-enhancing materials in the ink formula of the present invention gives the 3D printed object the ability to self-repair after being damaged. This self-repairing property reduces the performance degradation of the printed object caused by minor damage and improves its reliability and durability in long-term use.

[0045] 3. The present invention optimizes the photocuring behavior of the ink by precisely controlling the types and ratios of the photocurable monomers and photoinitiators. This optimization not only improves the printing efficiency, but also ensures that the printed object maintains good surface quality and detail resolution during the rapid curing process, meeting the needs of high-precision printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is an overall flow chart of Example 2 of the present invention.

[0047] Figure 2This is a detailed flow chart of step S5 in Example 2 of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments.

[0049] Example 1

[0050] This embodiment discloses a shape memory self-repairing 3D printing ink, which includes at least the following components:

[0051] Shape memory and reinforcement components, 15% to 25% by mass;

[0052] Self-repairing and reinforcing components, 10% to 20% by mass;

[0053] Photocurable monomer, 25% to 35% by mass;

[0054] Photoinitiator, 0.5% to 2% by weight;

[0055] Auxiliary agent, the mass percentage is 5% to 10%, and the rest is solvent;

[0056] Among them, the shape memory and reinforcement components include shape memory materials and memory reinforcement materials, and the self-repairing and reinforcement components include self-repairing materials and repair reinforcement materials.

[0057] Furthermore, the “shape memory material and memory enhancement material” are:

[0058] The shape memory material is a mixture of poly(N-isopropylacrylamide) and / or poly(acrylic acid-co-acrylamide) and polyvinyl alcohol / polyvinyl pyrrolidone copolymer and / or polycaprolactone;

[0059] The memory enhancement material is one or a mixture of poly(N,N-dimethylacrylamide), poly(N-vinylpyrrolidone), and poly(trimethylsiloxane propyl acrylate);

[0060] The mass percentage of the shape memory material is 15% to 20%, the mass percentage of the memory enhancement material is 5% to 10%, and the sum of the two does not exceed 25% of the total mass of the ink.

[0061] Furthermore, the “self-repairing and strengthening components” are:

[0062] The self-healing material is one or a mixture of poly(N-vinyl pyrrolidone), polyethyl dithiocarbamate, and polysulfide;

[0063] The repair and reinforcement material is one or a mixture of polyethylene glycol diacrylate, poly(acrylic acid-sodium acryloyloxyethyl methyl taurate), poly(N-isopropylacrylamide-co-acrylic acid);

[0064] The mass percentage of the self-repairing material is 10% to 15%, the mass percentage of the repairing and enhancing material is 5% to 10%, and the sum of the two does not exceed 20% of the total mass of the ink.

[0065] Wherein, the photocurable monomer is one or a mixture of ethyl acrylate, 2-hydroxyethyl acrylate, glycerol triacrylate or ethylene glycol tetraacrylate;

[0066] The photoinitiator is one or a mixture of benzoylmethane, 2-hydroxy-2-methyl-1-phenylacetone, 1-hydroxycyclohexyl benzophenone or 2,4,6-trimethylbenzoylphenylphosphine oxide.

[0067] Wherein, the auxiliary agent at least includes:

[0068] Stabilizer, mass percentage is 0.01% to 0.2%; defoamer, mass percentage is 0.01% to 0.2%;

[0069] Dispersant, 0.1% to 1% by mass; Wetting agent, 0.1% to 1% by mass;

[0070] Viscosity modifier, 1% to 3% by mass; surfactant, 0.1% to 0.5% by mass;

[0071] Preservatives, the mass percentage is 0.01% to 0.5%; colorants, the mass percentage is 0.1% to 1%.

[0072] Component design explanation:

[0073] Shape memory and enhancement components: accounting for 15% to 25% of the total mass of the ink, responsible for providing the ink with shape memory properties and enhancing its performance.

[0074] In the present invention, the shape memory material is selected based on its ability to return to its original shape under a specific stimulus, such as a temperature change. Poly(N-isopropylacrylamide) (PNIPAM) is selected for its property of undergoing a phase transition near the lower critical solution temperature (LCST), which enables it to achieve shape memory when the temperature changes. The use of poly(acrylic acid-co-acrylamide) in combination with polyvinyl alcohol / polyvinyl pyrrolidone copolymer (PVP / PVA) and polycaprolactone (PCL) is intended to improve the overall performance of the ink, including its processability and mechanical properties, although they themselves may not have significant shape memory capabilities. The combination of these materials is intended to optimize the performance of the ink through complementary properties while maintaining the shape memory properties.

[0075] The choice of memory-enhancing materials, such as poly(N,N-dimethylacrylamide), poly(N-vinylpyrrolidone), and poly(trimethylsiloxanepropyl acrylate), is to enhance the performance of shape memory materials. Although these materials do not have significant shape memory capabilities, they enhance the overall shape memory effect by improving the mechanical strength, stability, and durability of the ink. For example, poly(N-vinylpyrrolidone) (PVP) helps improve the processing performance of the ink and the durability of the final product due to its good water solubility and film-forming properties.

[0076] For daily 3D printing models, the memory generated by temperature sensitivity is the easiest to generate and trigger. However, for other materials with memory characteristics such as pH changes and electrical signal changes, the triggering conditions are generally more stringent and not easy to apply to daily 3D printing model design. However, the corresponding formula modification can also be carried out based on the design ideas of this embodiment to form a 3D printing ink with the same memory material characteristics. Although this design method is not proposed in this application, it should also be considered to belong to the technical scope of the protection requested by this application.

[0077] Self-repairing and reinforcing ingredients: accounting for 10% to 20% of the total mass of the ink, giving the ink self-repairing capabilities and enhancing its performance.

[0078] The selection of self-healing materials, such as poly(N-vinylpyrrolidone) (PVP), polydithiocarbamate (PDTC), and polythioether (PTh), is based on their ability to achieve self-healing through the breaking and reforming of chemical bonds. PVP was selected for its good water solubility and biocompatibility, and although it does not have self-healing ability itself, it can be used in combination with other self-healing materials such as PDTC and PTh, which achieve self-healing through the exchange reaction of thioether bonds.

[0079] Healing enhancement materials, such as polyethylene glycol diacrylate (PEGDA), poly(acrylic acid-sodium acryloyloxyethyl methyl taurate) (SAR-PAA), and poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-AA), are designed to enhance the performance of self-healing materials. These materials enhance the self-healing effect by improving the adhesion and mechanical strength of the ink. For example, PEGDA, as a commonly used photocurable monomer, not only helps to improve the photocuring performance of the ink, but also improves the flexibility and self-healing ability of the ink through its flexible chain segments. Although PEGDA itself does not have self-healing properties, its addition to the ink helps to improve the overall mechanical properties and durability, which is crucial for self-healing inks.

[0080] The 3D printing ink with memory properties and self-healing functions proposed in this application has a wide range of application scenarios and is innovative. In the field of smart devices, this ink can be used to manufacture smart components that can automatically adjust their shape or position according to changes in ambient temperature, such as heat sinks with adaptive temperature control or dampers that intelligently adjust the size of the opening. In the medical field, the self-healing property enables printed medical devices or implants to heal automatically when they suffer minor damage, extending their service life and ensuring patient safety. The art and toy manufacturing industries can also benefit from this ink to create more interactive and durable products that can respond to environmental changes or self-heal during use.

[0081] Photocurable monomer: accounts for 25% to 35% of the total mass of the ink and is the key component that enables the ink to cure quickly under light.

[0082] Photoinitiator: 0.5% to 2% of the total mass of the ink, used to trigger the photocuring reaction.

[0083] Additives: accounting for 5% to 10% of the total mass of the ink, used to adjust various properties of the ink, such as stability, fluidity, etc. For ease of understanding, this embodiment further explains the selection of additives. It should also be considered that other additives with the same functions can also be applied to the technology of this application.

[0084] As a stabilizer, hydroxyethylidene diphosphonic acid can be selected; as a defoamer, polydimethylsiloxane can be selected;

[0085] As dispersant, polyethylene oxide can be selected; as wetting agent, sodium oleate can be selected;

[0086] As a viscosity modifier, a mixture of alkali-swellable acrylic thickener TT-615 and DR-73 can be selected; as a surfactant, sodium butylnaphthalenesulfonate can be selected;

[0087] As a preservative, you can choose benzotriazole; as a colorant, you can choose a pigment with strong resistance to light and oxidation.

[0088] Example 2

[0089] This embodiment is based on the shape memory self-repairing 3D printing ink proposed in Example 1, and proposes a feasible method for preparing the shape memory self-repairing 3D printing ink. The specific steps are as follows: Figure 1-2 As shown;

[0090] S1. Based on the above shape memory self-repairing 3D printing ink, weigh the reaction raw materials. The specific material formula is as follows:

[0091] The “shape memory material and memory enhancement material” is 15wt% poly(N-isopropylacrylamide) and 5wt% poly(N,N-dimethylacrylamide);

[0092] The "self-repairing and strengthening components" are: 5wt% polydithiocarbamate, 5wt% polysulfide, 10wt% poly(N-isopropylacrylamide-co-acrylic acid);

[0093] The photocurable monomer is 25 wt % of 2-hydroxyethyl acrylate; and the photoinitiator is 2 wt % of benzoylmethane.

[0094] The stabilizer is 0.2 wt% of hydroxyethylidene diphosphonic acid; the defoamer is 0.2 wt% of polydimethylsiloxane;

[0095] The dispersant is 1wt% polyethylene oxide; the wetting agent is 0.5wt% sodium oleate;

[0096] The viscosity modifier is a mixture of 2 wt% of alkali-swellable acrylic thickeners TT-615 and DR-73; the surfactant is 0.5 wt% of sodium butylnaphthalene sulfonate;

[0097] The preservative is 0.2 wt% of benzotriazole; the colorant is 0.2 wt% of a coloring pigment with strong light resistance and oxidation resistance, and the rest is a solvent, which may be acetone, methanol, ethanol, tetrahydrofuran or the like.

[0098] S2, the preparation of shape memory and reinforcing components, adding them into the preparation container according to the mass fraction, and stirring at low speed and low temperature until the mixture is completely dissolved;

[0099] S3, the self-repairing and strengthening components are prepared by adding them into the preparation container according to the mass fraction, and stirring at a low speed and low temperature until the mixture is completely dissolved;

[0100] S4, mixing the shape memory and reinforcement components prepared in S2 with the self-repairing and reinforcement components prepared in S3, adding photocurable monomers and photoinitiators, and adjusting the addition of solvents and additives according to the viscosity and solubility of the mixture;

[0101] S51, pre-mixing the mixture prepared in S4 at room temperature and at a low speed of 200-300 rpm for 30-60 min;

[0102] S52, increase to medium speed 500-700rpm, and continue stirring for about 1-2h until the ink is uniform and there is no obvious stratification or precipitation;

[0103] S53, transfer the mixed ink in step S52 into a vacuum degassing device, set the vacuum degree to 0.01-0.05MPa, the temperature to 25-40°C, and the low speed to 200-300rpm for degassing for 30-60min, and restore the pressure to the same as the external pressure at a uniform speed 15min before the end of the degassing process;

[0104] S54, transferring the vacuum degassed ink in step S53 into a membrane filtration device, selecting a filtration membrane with a pore size of 0.1-0.2 microns and controlling the filtration pressure at 0.1-0.2 MPa;

[0105] S6. Shape memory self-repairing 3D printing ink will eventually be obtained.

[0106] Preparation principle:

[0107] First of all, this preparation method is based on the dual mechanism of chemical synthesis and physical mixing. In steps S2 and S3, shape memory and reinforcement components and self-repair and reinforcement components are modulated respectively. The core of this step is to ensure that various polymer materials (such as poly (N-isopropylacrylamide), polydithiocarbamate, etc.) are fully dissolved in the solvent to form a uniform solution. The selection of these polymer materials is based on their specific functions, such as shape memory effect, self-repair ability and enhanced physical properties. By stirring at low speed and low temperature, the breakage and degradation of the polymer chain can be effectively avoided, while promoting the full infiltration and dissolution of the solvent into the polymer material.

[0108] Next, in step S4, the shape memory and reinforcement components are mixed with the self-healing and reinforcement components, and photocurable monomers and photoinitiators are added. The purpose of this step is to combine polymer materials with different functions to form a multifunctional ink system. The addition of photocurable monomers and photoinitiators is to give the ink the ability to photocuring, so that it can be quickly cured and formed during the 3D printing process. In addition, the amount of solvent and additives added needs to be adjusted according to the viscosity and solubility of the mixture to ensure the fluidity and stability of the ink. The key to this step is to balance the proportions of various components to achieve optimal performance.

[0109] Finally, in steps S51 to S54, a series of treatments such as premixing, medium-speed stirring, vacuum degassing and membrane filtration were carried out to further optimize the performance of the ink. Premixing and medium-speed stirring help to disperse the various components more evenly in the solvent to form a stable ink system. Vacuum degassing can remove bubbles and volatile substances in the ink to avoid defects during the 3D printing process. Membrane filtration can further remove impurities and particles in the ink to ensure its purity and printing quality. Through these processing steps, a 3D printing ink with excellent shape memory, self-healing ability and good fluidity can be obtained, providing strong support for subsequent 3D printing applications.

[0110] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A shape memory self-repairing 3D printing ink, characterized in that: The ink comprises at least the following components: Shape memory and reinforcement components, 15% to 25% by mass; Self-repairing and reinforcing components, 10% to 20% by mass; Photocurable monomer, 25% to 35% by mass; Photoinitiator, 0.5% to 2% by weight; Auxiliary agent, the mass percentage is 5% to 10%, and the rest is solvent; Among them, the shape memory and reinforcement components include shape memory materials and memory reinforcement materials, and the self-repairing and reinforcement components include self-repairing materials and repair reinforcement materials.

2. A shape memory self-repairing 3D printing ink as claimed in claim 1, characterized in that: The "shape memory material and memory enhancement material" are: The shape memory material is a mixture of poly(N-isopropylacrylamide) and / or poly(acrylic acid-co-acrylamide) and polyvinyl alcohol / polyvinyl pyrrolidone copolymer and / or polycaprolactone; The memory enhancement material is one or a mixture of poly(N,N-dimethylacrylamide), poly(N-vinylpyrrolidone), and poly(trimethylsiloxane propyl acrylate); The mass percentage of the shape memory material is 15% to 20%, the mass percentage of the memory enhancement material is 5% to 10%, and the sum of the two does not exceed 25% of the total mass of the ink.

3. A shape memory self-repairing 3D printing ink as claimed in claim 1 or 2, characterized in that: The "self-repairing and strengthening components" are: The self-healing material is one or a mixture of poly(N-vinyl pyrrolidone), polyethyl dithiocarbamate, and polysulfide; The repair and reinforcement material is one or a mixture of polyethylene glycol diacrylate, poly(acrylic acid-sodium acryloyloxyethyl methyl taurate), poly(N-isopropylacrylamide-co-acrylic acid); The mass percentage of the self-repairing material is 10% to 15%, the mass percentage of the repairing and enhancing material is 5% to 10%, and the sum of the two does not exceed 20% of the total mass of the ink.

4. A shape memory self-repairing 3D printing ink as claimed in claim 1, characterized in that: The photocurable monomer is one or a mixture of ethyl acrylate, 2-hydroxyethyl acrylate, glycerol triacrylate or ethylene glycol tetraacrylate; The photoinitiator is one or a mixture of benzoylmethane, 2-hydroxy-2-methyl-1-phenylacetone, 1-hydroxycyclohexyl benzophenone or 2,4,6-trimethylbenzoylphenylphosphine oxide.

5. The shape memory self-repairing 3D printing ink according to claim 1, characterized in that: The auxiliary agent at least comprises: Stabilizer, mass percentage is 0.01% to 0.2%; defoamer, mass percentage is 0.01% to 0.2%; Dispersant, 0.1% to 1% by mass; Wetting agent, 0.1% to 1% by mass; Viscosity modifier, 1% to 3% by mass; surfactant, 0.1% to 0.5% by mass; Preservatives, the mass percentage is 0.01% to 0.5%; colorants, the mass percentage is 0.1% to 1%.

6. A method for preparing shape memory self-repairing 3D printing ink, characterized in that: The preparation method comprises at least the following steps: S1. Weigh the reaction raw materials according to any of the shape memory self-repairing 3D printing inks of claims 1-5; S2, the preparation of shape memory and reinforcing components, adding them into the preparation container according to the mass fraction, and stirring at low speed and low temperature until the mixture is completely dissolved; S3, the self-repairing and strengthening components are prepared by adding them into the preparation container according to the mass fraction, and stirring at a low speed and low temperature until the mixture is completely dissolved; S4, mixing the shape memory and reinforcement components prepared in S2 with the self-repairing and reinforcement components prepared in S3, adding photocurable monomers and photoinitiators, and adjusting the addition of solvents and additives according to the viscosity and solubility of the mixture; S5. Mix and disperse all components until the mixed ink is uniform and consistent without obvious stratification or precipitation; S6. Shape memory self-repairing 3D printing ink will eventually be obtained.

7. A method for preparing a shape memory self-repairing 3D printing ink as claimed in claim 6, characterized in that: The S5 step includes: S51, pre-mixing the mixture prepared in S4 at room temperature and at a low speed of 200-300 rpm for 30-60 min; S52, increase to medium speed 500-700rpm, and continue stirring for about 1-2h until the ink is uniform and consistent without obvious stratification or precipitation.

8. The method for preparing a shape memory self-repairing 3D printing ink according to claim 7, characterized in that: The step S5 further includes: S53, transfer the mixed ink in step S52 into a vacuum degassing device, set the vacuum degree to 0.01-0.05MPa, the temperature to 25-40°C, and the degassing at a low speed of 200-300rpm for 30-60min. 15min before the end of the degassing process, restore the pressure to the same as the external pressure at a uniform speed.

9. The method for preparing a shape memory self-repairing 3D printing ink according to claim 8, characterized in that: The step S5 further includes: S54, transferring the vacuum degassed ink in step S53 into a membrane filtration device, selecting a filtration membrane with a pore size of 0.1-0.2 microns and controlling the filtration pressure at 0.1-0.2 MPa.

Images