High-performance flame-retardant inkjet ink and preparation method thereof

Abstract

The invention relates to the technical field of flame-retardant materials, and discloses a high-performance flame-retardant inkjet ink, which comprises the following components by mass: 20-35% of ammonium polyphosphate; 8%-15% of organic siloxane; 10% to 20% of melamine polyphosphate; 5%-10% of modified montmorillonite; 2%-8% of nano silicate; 1%-5% of boron nitride sheets; 0.5%-2% of rare earth oxide; 2%-10% of color paste; 1%-3% of a dispersing agent; 1%-3% of a coalescing agent; 2%-6% of a viscosity modifier; and 25%-35% of deionized water. Through the synergistic effect of ammonium polyphosphate and melamine polyphosphate, a continuous and compact carbon layer in a high-temperature environment is formed, compared with a single-scale enhanced flame-retardant system in the prior art, the carbon layer structure is continuously optimized in multiple temperature stages, and the defects that the carbon layer is prone to cracking and poor in oxidation resistance are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of flame retardant materials, in particular to a high-performance flame retardant inkjet ink and a preparation method thereof. Background Art

[0002] With the rapid development of industrialization and urbanization, the increase in fire risks has led to a growing demand for flame retardant materials in the fields of construction, electronics, and transportation. In this context, flame retardant coatings and flame retardant inks have gradually attracted widespread attention due to their easy coating and multifunctionality.

[0003] The flame retardant properties of existing flame retardant inks usually rely on a single carbonizing agent (such as ammonium polyphosphate) or a simple carbonizing filler (such as silicate) to generate a carbon layer through high-temperature decomposition. However, this single-acting carbon layer often shows crack expansion and increased pores at high temperatures, which significantly reduces the thermal barrier function of the carbon layer and thus affects the flame retardant properties.

[0004] Current research shows that the density and mechanical properties of the carbon layer directly determine its ability to resist high-temperature oxidation and its thermal insulation effect. However, in traditional flame retardant systems, the carbon layer has a single formation path and lacks a dynamic enhancement mechanism, making it difficult to effectively inhibit crack propagation. This defect causes existing flame retardant inks to show problems such as carbon layer embrittlement and decreased flame retardant properties when exposed to high temperatures for a long time.

[0005] For example, although traditional phosphorus-based flame retardants can catalyze carbonization in the early stages of combustion, the carbonization efficiency is limited and the carbon layer structure is loose. In addition, although the ceramicization reaction of silicon-based materials at high temperatures can improve the performance of some carbon layers, the dispersion is poor and the reaction window is single, resulting in insufficient synergy. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a high-performance flame-retardant inkjet ink and a preparation method thereof, which solves the problem of insufficient density of the carbon layer in the prior art flame-retardant inkjet ink.

[0007] To achieve the above objectives, the present invention is implemented by the following technical solution: a high-performance flame-retardant inkjet ink, comprising the following components in percentage by mass: Ammonium polyphosphate: 20% to 35%; Organic siloxane: 8% to 15%; Melamine polyphosphate: 10% to 20%; Modified montmorillonite: 5% to 10%; Nano silicate: 2% to 8%; Boron nitride flakes: 1% to 5%; Rare earth oxides: 0.5% to 2%; Color paste: 2%~10%; Dispersant: 1%~3%; Film-forming aid: 1% to 3%; Viscosity regulator: 2% to 6%; Deionized water: 25%~35%.

[0008] Preferably, the thermal decomposition temperature of the color paste is ≥400°C.

[0009] Preferably, the modified montmorillonite is modified by a silane coupling agent, and the amount of the silane coupling agent used is 0.5% to 2% of the mass of the modified montmorillonite.

[0010] Preferably, the rare earth oxide is cerium oxide.

[0011] Preferably, the dispersant is polyvinyl pyrrolidone.

[0012] Preferably, the film-forming aid is ethylene glycol monobutyl ether, and the viscosity modifier is polyethylene glycol.

[0013] A method for preparing a high-performance flame-retardant inkjet ink comprises the following steps: S1, mixing the modified montmorillonite and nano-silicate to obtain nano-composite particles; S2, mixing ammonium polyphosphate and melamine polyphosphate, adding deionized water and stirring to form a flame retardant base slurry; S3, adding dynamic enhancement components, nanocomposite particles, color paste and auxiliary components to the flame retardant base slurry in sequence and stirring evenly; S4, subjecting the mixture to ultrasonic dispersion treatment; S5. Obtain flame-retardant inkjet ink through filtering and vacuum degassing processes in sequence.

[0014] Preferably, the step S1 comprises treating the modified montmorillonite and the nano-silicate in a ratio of 2:1 to 5:1 in a ball mill at a rotation speed of 100 to 300 rpm for 2 to 4 hours.

[0015] Preferably, the ultrasonic dispersion treatment time in step S4 is 15 to 30 minutes and the temperature is 25 to 40°C.

[0016] Preferably, the pore size of the filter membrane used in step S5 is 0.2 μm, the vacuum degree of the vacuum degassing process is -0.08 to -0.1 MPa, and the time is 15 to 30 minutes.

[0017] The present invention provides a high-performance flame-retardant inkjet ink and a preparation method thereof, which has the following beneficial effects: 1. The present invention forms a continuous and dense carbon layer under high temperature environment through the synergistic effect of ammonium polyphosphate and melamine polyphosphate, combined with the dynamic release of nano-silicate and boron nitride flakes. Compared with the single-scale enhanced flame retardant system in the prior art, the present invention continuously optimizes the carbon layer structure in multiple temperature stages, overcoming the shortcomings of easy cracking and weak antioxidant ability of the carbon layer.

[0018] 2. The present invention optimizes the type and particle size of the color paste, selects inorganic pigments with excellent thermal stability and specific dispersants, ensures that the pigment is stable at high temperatures, and does not interfere with the decomposition path of the flame retardant base material. This not only improves the coloring ability of the ink, but also enhances the density of the carbon layer under high temperature environments.

[0019] 3. The present invention adopts a step-by-step treatment process of modified nanoparticles and dynamic enhancement components, and improves the dispersibility and uniformity of the flame retardant ink through precise parameter control of processes such as mechanochemistry, ultrasonic dispersion and vacuum degassing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the preparation method steps of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please see attached Figure 1 Example 1: Preparation of flame-retardant ink with multi-scale synergistic enhancement of dynamic carbon layer Pretreatment of nanofillers: Modified Montmorillonite (MMT) and nano silicate (NS) were mixed in a mass ratio of 3:1 and placed in a ball mill for treatment at 150 rpm for 3 hours. Then, silane coupling agent (SCA) (mass ratio was 1% of the total mass of the filler) was added and stirred at 70°C for 90 minutes to obtain nanocomposite particles.

[0023] Preparation of flame retardant base material: Ammonium polyphosphate (APP) and melamine polyphosphate (MPP) were mixed in a mass ratio of 2:1. Deionized water (DI Water) was added (solid-liquid ratio 1:4), and stirred at 350 rpm for 20 minutes to form a uniform slurry.

[0024] Dynamic reinforcement component addition: Polydimethylsiloxane Emulsion (PDMS emulsion, 10% by mass), boron nitride nanosheets (BN, 3% by mass) and the aforementioned nanocomposite particles were added to the base slurry in sequence, and the stirring speed was controlled at 600 rpm for 40 minutes.

[0025] Color paste and additives: Carbon Black Pigment (CB, 5%, particle size 100 nm), Polyvinylpyrrolidone (PVP, 2%), Ethylene Glycol Monobutyl Ether (EGBE, 2%, film-forming aid), Polyethylene Glycol (PEG, 4%, viscosity regulator), Rare Earth Oxide (REO, cerium oxide, mass fraction 1%).

[0026] The mixture was treated under an ultrasonic disperser for 25 minutes with the temperature controlled at 30°C.

[0027] Filtration and degassing: Filter with a 0.2 μm filter membrane to remove large particles. Vacuum degassing (-0.09 MPa) for 25 minutes to obtain a flame retardant inkjet ink.

[0028] Example 2: Preparation of ink with optimized color paste and flame retardant performance Nanofiller pretreatment: Modified montmorillonite (MMT) and nanosilicate (NS) were mixed in a ratio of 2:1 and processed using a ball mill at 200 rpm for 4 hours.

[0029] Preparation of flame retardant base material: APP and MPP were mixed in a ratio of 3:1, DI Water (solid-liquid ratio 1:3) was added, and stirred at 400 rpm for 30 minutes.

[0030] Dynamic reinforcement component addition: PDMS emulsion (mass fraction 12%), BN (mass fraction 4%), and the aforementioned nanofiller were added to the base slurry; the stirring speed was 700 rpm, and the time was 50 minutes.

[0031] Addition of color paste and additives: Add iron oxide color paste (Iron Oxide Pigment, IOP, mass fraction 7%, particle size 80 nm), PVP dispersant (2%), EGBE (2%, film-forming aid), PEG (3%, viscosity regulator), REO (cerium oxide, mass fraction 1.5%), and treat under ultrasonic disperser for 30 minutes.

[0032] Filtration and degassing: Filter using a filter membrane with a pore size of 0.2 μm and degas under vacuum (-0.1 MPa) for 30 minutes.

[0033] Example 3: Ink preparation with refined process optimization Nanofiller pretreatment: Modified montmorillonite (MMT) and nanosilicate (NS) were mixed in a mass ratio of 3:1, ball-milled at 150 rpm for 3.5 h, SCA (mass fraction 1.2%) was added, and stirred at 70 °C for 1.5 h.

[0034] Preparation of flame retardant base material: APP and MPP were mixed in a mass ratio of 3:1, DI Water (solid-liquid ratio 1:4) was added, and stirred at 400 rpm for 25 minutes to form a uniform base slurry.

[0035] Dynamic reinforcement components were added: PDMS emulsion (mass fraction 10%), BN (mass fraction 5%), and the aforementioned nanocomposite particles. Stirring was performed at 600 rpm for 45 minutes.

[0036] Add the following color paste and additives: IOP (5% by mass), PVP dispersant (2%), EGBE (2%, film-forming aid), PEG (4%, viscosity regulator), REO (cerium oxide, 1.8% by mass), and disperse with ultrasonic for 20 minutes.

[0037] Filtration and degassing: After filtering with a 0.2μm filter membrane, vacuum degassing (-0.09MPa) for 20 minutes.

[0038] Comparative Example 1: Preparation of flame retardant ink without dynamic enhancement Nanofiller pretreatment: The mixing treatment of montmorillonite and nanosilicate was omitted, and untreated montmorillonite particles (unmodified) were directly added without adding silane coupling agent.

[0039] Preparation of flame retardant base material: ammonium polyphosphate and melamine polyphosphate are directly mixed without slurry stirring and used directly as the base material.

[0040] Dynamic enhancement component addition: No PDMS was added, only APP and MPA were added, and the stirring speed was reduced to 300 rpm for 10 minutes.

[0041] Color paste and additives are added: carbon black (particle size 500nm) that has not been dispersed is added, and dispersants and film-forming additives are added in conventional proportions, but ultrasonic dispersion treatment is not performed.

[0042] Filtration and degassing: The pore size of the filter membrane was adjusted to 1 μm and the vacuum degassing time was reduced to 10 minutes.

[0043] Comparative Example 2: Preparation of flame retardant ink with unoptimized color paste Nanofiller pretreatment: Unmodified montmorillonite was used and the ball milling time was shortened to 1 h.

[0044] Preparation of flame retardant base material: ammonium polyphosphate and melamine polyphosphate were mixed in a ratio of 2:1, the solid-liquid ratio of deionized water was changed to 1:2, and the stirring speed was 250 rpm.

[0045] Dynamic enhancement component addition: PDMS addition amount was reduced to 5%, and stirring speed was changed to 400 rpm.

[0046] Addition of color paste and additives: Add phthalocyanine blue paste (particle size 800nm) that has not been dispersed, and add dispersant and film-forming additive in proportion, but do not perform ultrasonic dispersion.

[0047] Filtration and degassing: The pore size of the filter membrane is adjusted to 0.5 μm, and the vacuum degassing process is omitted.

[0048] Comparative Example 3: Ink prepared by unoptimized process Nanofiller pretreatment: Modified montmorillonite was directly mixed with nanosilicate without ball milling.

[0049] Preparation of flame retardant base material: The mixing ratio of APP and MPA was changed to 1:1, the stirring speed was reduced to 200 rpm, and the time was shortened to 10 minutes.

[0050] Dynamic enhancement component addition: PDMS addition amount is 2%, and BN flakes are not added.

[0051] Color paste and additives addition: The color paste uses iron oxide with a particle size of 1µm, the ratio of dispersant and film-forming additive is halved, and ultrasonic dispersion is not performed.

[0052] Filtration and degassing: The pore size of the filter membrane was adjusted to 1µm, and no degassing treatment was performed.

[0053] Next, the experimental setting is based on the aforementioned embodiments and comparative examples, and combined with actual application scenarios, a test experiment covering flame retardant performance, color performance, ink compatibility and comprehensive stability is designed.

[0054] Experiment 1: Specific experimental instructions for flame retardant performance test Purpose: The flame retardant properties of the inks of different embodiments and comparative examples were verified, and the compactness and flame retardant effect of the carbon layer formed were evaluated by the UL-94 vertical burning test.

[0055] Experimental Materials: Coating substrate: 3mm thick polycarbonate board (PC board).

[0056] Test samples: flame retardant inkjet inks prepared in Example 1, Example 3, and Comparative Example 1 and Comparative Example 3.

[0057] Tools and equipment: UL-94 vertical burning tester, electronic balance (accuracy 0.01g).

[0058] Experimental steps: Preparation of coating samples: The inks of different embodiments and comparative examples were uniformly coated on the surface of the PC board, and the coating thickness was controlled to be 50 μm.

[0059] Allow to dry naturally at room temperature for 24 hours.

[0060] Burning test: The coated sample was fixed to the fixture of the UL-94 vertical burning tester.

[0061] Use a flame of specified size to ignite the bottom of the sample, with a burning time of 10 seconds.

[0062] After removing the flame, observe and record: the self-extinguishing time of the sample. The thickness of the residual carbon layer. The height of the flame extension. Determination of carbon layer residue: Weigh the sample after combustion with an electronic balance and calculate the residual carbon percentage (residual carbon mass / initial sample mass × 100%). Visually record the cracks and integrity of the carbon layer.

[0063] Experimental replication: Each group of samples was tested 5 times, and the average value was taken as the final data.

[0064] Experimental data table: Experimental Summary The compactness of the carbon layer is obviously one of the core advantages of the present invention, especially under the synergistic effect of the dynamic reinforcement components, the residual mass of the carbon layer is greatly improved. In Example 1 and Example 3, the initial forming efficiency of the carbon layer is significantly improved by the dynamic release of ammonium polyphosphate (APP) and PDMS. In comparison, the crack density of the carbon layer in Comparative Example 1 and Comparative Example 3 is higher, and the residual carbon mass is lower. It can be seen that the lack of a dynamic ceramicization path will rapidly reduce the antioxidant capacity of the carbon layer, and the flame retardant effect is difficult to ensure.

[0065] In terms of the height comparison of flame extension, the flame height of Example 3 is only 9 mm, which is nearly 60% less than that of Comparative Example 3. This is not the effect of a single material, but the result of the synergy of multiple components. The SiO2 released by nano-silicates at medium and high temperature stages obviously participates in the filling of cracks and forms a stable barrier layer. This enhancement effect is more prominent for gas phase and condensed phase flame retardant reactions at high temperatures. The integrity of the carbon layer remains stable even after multiple tests, indicating that the design of the dynamic carbon layer has achieved good optimization.

[0066] The difference in self-extinguishing time fully demonstrates the importance of multi-scale synergistic mechanism. The self-extinguishing time of Example 1 is only 2.1 seconds, while that of Comparative Example 1 is 4.7 seconds, which is nearly double the difference. This is largely because the dynamic reinforcement component fails to effectively stimulate the cross-linking reaction of the carbon layer. In contrast, the cross-action of siloxane and melamine polyphosphate is particularly critical in the examples. The high-strength network formed by cross-linking obviously improves the physical strength of the carbon layer and enhances the crack resistance of the carbon layer. This feature is directly reflected in the test as an improvement in the flame retardant grade.

[0067] Experiment 2: Color performance and flame retardant performance compatibility test Purpose The performance of the color paste in the flame retardant inkjet ink of the present invention is tested, including the color saturation and the flame retardant performance of the coating, to verify the compatibility of the color paste with the flame retardant component.

[0068] Experimental Materials Coating substrate: white smooth PVC board (100×100mm).

[0069] Test samples: inks prepared in Example 2, Example 3, and Comparative Examples 2 and 3.

[0070] Tools and equipment: spectrophotometer (color measurement equipment), UL-94 vertical burning tester.

[0071] Experimental procedures Color coating preparation Each sample was coated on the surface of a PVC plate, and the ink coating thickness was controlled to be 40 μm.

[0072] Allow to dry naturally for 12 hours at 25°C and 50% relative humidity.

[0073] Color performance test Use a spectrophotometer to measure the CIE-Lab* value (reflecting brightness, hue, and saturation in the color space) of the coating sample.

[0074] Compare the color difference value ΔE of each sample (compared with the standard color card) and record the saturation at the same time.

[0075] Flame retardant performance test According to the UL-94 vertical burning test, the PVC board coating sample is fixed to the tester fixture.

[0076] Ignite with a 10-second flame and record the burning time, flame extension height, and self-extinguishing time.

[0077] Coating distribution observation Observe the uniformity of the colorant coating under natural light.

[0078] Use a microscope to magnify and observe the particle aggregation phenomenon to determine whether the color paste and flame retardant are evenly dispersed.

[0079] Experimental replication Each test was repeated 3 times and the average value was taken.

[0080] Experimental data table: Experimental Summary The compatibility of color and flame retardancy has always been a difficulty in industrial applications. In this experiment, the performance of the examples was impressive. The color difference value ΔE of Example 2 is only 3.2, which is almost indistinguishable from the standard color card. At the same time, its saturation reaches 85, and the color performance is bright and full. This is obviously because the particle size of the color paste is finely controlled, and the color paste particles are evenly suspended with the optimized design of the dispersant. In Comparative Example 2, the phthalocyanine blue that has not been dispersed forms large particle agglomerates, the color difference reaches 5.9, and the saturation is significantly reduced. Insufficient dispersion makes the color performance almost a decoration.

[0081] The data of flame retardant performance is more intuitive. The self-extinguishing time of Example 3 is only 2.1 seconds, and the flame extension height is controlled within 9mm. The realization of this effect is inseparable from the strengthening effect of the dynamic carbon layer. The color paste not only does not interfere with the flame retardant base material, but also plays a subtle role in the densification of the carbon layer. Comparative Example 3 is completely different. The thermal decomposition of the color paste not only generates combustion promoters, but also destroys the decomposition path of the flame retardant.

[0082] Observation of coating distribution also reveals the importance of compatibility optimization. The uniformity of the color paste coating of the embodiment is very outstanding, and almost no particle aggregation can be seen under the microscope. This performance is obviously due to the effect of the dispersant. The particles in the comparative example are relatively rough, and even obvious sedimentation and aggregation occur. This uneven distribution has a negative impact on both color and flame retardant properties. Compatibility optimization is the key. It not only makes the color bright and lasting, but also significantly improves the flame retardant properties.

[0083] Experiment 3: Carbon layer structure and density test Purpose Through high-temperature carbonization experiments and carbon layer mechanical property tests, the effectiveness of the dynamic carbon layer reinforcement technology in the present invention is evaluated, and the performance advantages of the carbon layer in terms of crack number, density and compressive strength are verified.

[0084] Experimental Materials Coating substrate: 50×50×2 mm stainless steel sheet.

[0085] Test samples: flame retardant inks of Example 1, Example 3, and Comparative Example 1 and Comparative Example 3.

[0086] Equipment: high temperature furnace, scanning electron microscope (SEM, 1000×), nanoindenter (to measure compressive strength).

[0087] Experimental procedures Sample preparation: Different ink samples were evenly coated on the surface of stainless steel sheets, and the coating thickness was controlled at 50 μm. They were left to dry at room temperature for 24 hours to ensure that the coating was stable and fully adhered to the substrate.

[0088] High temperature treatment: The dried sample was placed in a high temperature furnace, heated to 600°C at a heating rate of 10°C / min, and kept at this temperature for 10 minutes.

[0089] The sample was taken out of the furnace and cooled to room temperature before observing the carbon layer formed by carbonization of the coating.

[0090] Microstructure analysis: SEM was used to observe the number, length and distribution of micro cracks in the carbon layer.

[0091] Focus on whether the cracks are concentrated, whether the expansion path is uniform, and the overall surface density of the carbon layer.

[0092] Compressive strength test The compressive strength of the carbon layer was measured using a nanoindenter.

[0093] Select three test points on the surface of the carbon layer for measurement, record the compressive strength value at each point, and calculate the average value.

[0094] Experimental replication Each group of samples was tested 3 times to ensure the accuracy and repeatability of the results.

[0095] Experimental data table: Experimental Summary The comparison of the number and length of cracks has revealed the importance of the dynamic enhancement mechanism. In Example 1, the number of cracks in the carbon layer is only 14, while that in Comparative Example 1 reaches 27, almost double. The formation process of the dynamic carbon layer depends on synergistic reactions, especially the combined release of ammonium polyphosphate and siloxane. In the high temperature stage, nanosilicates and boron nitride flakes effectively fill the cracks in the initial stage of formation, blocking the further expansion of the cracks. This behavior is not a single reaction, but a synergistic result of the components. The cracks in the comparative samples are not only numerous, but also have complex paths, and it is obvious that an effective inhibition mechanism has not been formed.

[0096] The performance difference in compressive strength is even more significant. The compressive strength of Example 3 reaches 45.8MPa, which is more than twice that of Comparative Example 1. During the high-temperature carbonization process, the decomposition products of the dynamic reinforcement components form a cross-linked network with the carbon layer, giving it higher mechanical properties. In particular, the addition of rare earth oxides significantly improves the pressure resistance of the carbon layer. Due to the lack of this reinforcement mechanism, the mechanical properties of the carbon layer in Comparative Example 1 are significantly reduced. This strength gap is not accidental, but a direct reflection of the difference in high-temperature reaction path design.

[0097] The density score of the carbon layer fully illustrates the advantage of dynamic synergy. The carbon layer score of the example is close to 9, while the comparative example is only between 4 and 6. In the later stage of high temperature, the nanoparticles in the example fill the tiny pores through the ceramic reaction, making the surface of the carbon layer more complete. This difference in density is not just a superficial problem, but also directly affects the sustainability of flame retardant properties. The denser the carbon layer, the more difficult it is for oxygen to penetrate and the slower the spread of combustion. In the comparative example, due to the propagation of cracks and the accumulation of defects, the carbon layer quickly broke down at high temperature and could not form an effective protective barrier. This structural weakening makes the final performance of the comparative example almost lose its industrial value.

[0098] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high performance flame retardant inkjet ink, characterized in that: The following components are included in mass percentage: Ammonium polyphosphate: 20% to 35%; Organic siloxane: 8% to 15%; Melamine polyphosphate: 10% to 20%; Modified montmorillonite: 5% to 10%; Nano silicate: 2% to 8%; Boron nitride flakes: 1% to 5%; Rare earth oxides: 0.5% to 2%; Color paste: 2%~10%; Dispersant: 1%~3%; Film-forming aid: 1% to 3%; Viscosity regulator: 2% to 6%; Deionized water: 25%~35%.

2. A high performance flame retardant inkjet ink according to claim 1, characterized in that: The thermal decomposition temperature of the color paste is ≥400°C.

3. A high performance flame retardant inkjet ink according to claim 1, characterized in that: The modified montmorillonite is modified by a silane coupling agent, and the amount of the silane coupling agent used is 0.5% to 2% of the mass of the modified montmorillonite.

4. The high performance flame retardant inkjet ink according to claim 1, characterized in that: The rare earth oxide is cerium oxide.

5. The high performance flame retardant inkjet ink according to claim 1, characterized in that: The dispersant is polyvinyl pyrrolidone.

6. The high performance flame retardant inkjet ink according to claim 1, characterized in that: The film-forming aid is ethylene glycol monobutyl ether, and the viscosity regulator is polyethylene glycol.

7. A method for preparing a high-performance flame-retardant inkjet ink, according to a high-performance flame-retardant inkjet ink according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, mixing the modified montmorillonite and nano-silicate to obtain nano-composite particles; S2, mixing ammonium polyphosphate and melamine polyphosphate, adding deionized water and stirring to form a flame retardant base slurry; S3, adding polydimethylsiloxane emulsion, boron nitride flakes, modified montmorillonite, nanosilicate, color paste and polyvinyl pyrrolidone, ethylene glycol monobutyl ether, polyethylene glycol, cerium oxide, and deionized water to the flame retardant base slurry in sequence, and stirring evenly; S4, subjecting the mixture to ultrasonic dispersion treatment; S5. Obtain flame-retardant inkjet ink through filtering and vacuum degassing processes in sequence.

8. The method for preparing a high-performance flame-retardant inkjet ink according to claim 7, characterized in that: The step S1 comprises treating the modified montmorillonite and the nano-silicate in a ratio of 2:1 to 5:1 in a ball mill at a rotation speed of 100 to 300 rpm for 2 to 4 hours.

9. The method for preparing a high-performance flame-retardant inkjet ink according to claim 7, characterized in that: The ultrasonic dispersion treatment time in step S4 is 15 to 30 minutes and the temperature is 25 to 40°C.

10. The method for preparing a high-performance flame-retardant inkjet ink according to claim 7, characterized in that: The pore size of the filter membrane used in step S5 is 0.2 μm, the vacuum degree of the vacuum degassing process is -0.08 to -0.1 MPa, and the time is 15 to 30 minutes.

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