Self-curing paste and preparation method thereof

Abstract

The invention relates to the technical field of stickers, in particular to a self-curing sticker and a preparation method thereof. The preparation method of the self-curing paste comprises the following steps: (1) in a nitrogen atmosphere, carrying out vacuum heating and cooling on polytetramethylene ether glycol, then adding isophorone diisocyanate, DBTDL, a pigment, an ultraviolet absorbent and N, N-dimethylacetamide, carrying out stirring treatment, then adding a modified halloysite dispersion liquid, and continuously stirring to obtain a prepolymer; and (2) adding a chain extension flame retardant into N, N-dimethylacetamide, then dropwise adding the mixture into the prepolymer prepared in the step (1), continuously stirring, pouring the mixture into a mold while the mixture is hot, vacuumizing and packaging to obtain the self-curing paste. The self-curing paste prepared by the invention realizes self-curing at normal temperature, has excellent sealing performance, excellent high temperature resistance and atmospheric aging resistance, the flame retardant grade of the material is as high as V0, the delayed combustion risk is avoided, and the field construction is flexible and convenient.

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, specifically relating to a self-curing adhesive and its preparation method. Background Technology

[0002] Barrier tape combines the ease of installation with strong sealing performance of ordinary tape, representing a new concept in electrical equipment sealing materials. It is suitable for moisture-proofing and fire-proofing sealing of internal and external electrical cabinets, power conduits, cable trays, and other areas at 35kV and below, preventing accidents such as short circuits, fires, accidental tripping, and electric shocks caused by moisture condensation. The tape material must possess excellent sealing and adhesion properties, as well as good flame-retardant properties, ensuring it does not burn or is difficult to ignite at high temperatures to prevent fire damage to equipment, and it has a long service life.

[0003] Therefore, there is an urgent need for an adhesive with good sealing properties, durability, flame retardancy, and ease of application. Summary of the Invention

[0004] The purpose of this invention is to provide a self-curing adhesive tape and its preparation method, in order to solve the technical problems in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a method for preparing a self-curing adhesive tape, comprising the following steps: Step (1) Under a nitrogen atmosphere, polytetramethylene ether glycol is vacuum heated and cooled. Then, isophorone diisocyanate, DBTDL, pigment, UV absorber and N,N-dimethylacetamide are added and stirred. Then, modified halloysite dispersion is added and stirred to obtain the prepolymer. Step (2) Add the chain extender flame retardant to N,N-dimethylacetamide, then drop it into the prepolymer prepared in step (1), continue stirring, pour it into the mold while hot, vacuum and package it to obtain the self-curing sticker.

[0006] Preferably, in step (1), the number average molecular weight of polytetramethylene ether glycol is 2000 g / mol; the ratio of polytetramethylene ether glycol, isophorone diisocyanate, DBTDL, pigment, UV absorber, N,N-dimethylacetamide, and modified halloysite dispersion is 20-40 g: 12-19 g: 0.2-0.4 mL: 1-3 g: 0.3-0.6 g: 100-200 mL: 50-100 mL; vacuum heating conditions: vacuum heating temperature is 115-125℃, vacuum heating... The heating time is 110-130 min; the cooling temperature is 75-85℃; the stirring conditions are: stirring temperature 75-85℃, stirring time 1.5-2.5 h; the preparation method of the modified halloysite dispersion is: dispersing modified halloysite in N,N-dimethylacetamide to obtain a 5-8 wt% modified halloysite dispersion; the stirring conditions are: stirring temperature 75-85°C, stirring time 0.5-1 h; the pigment is carbon black; the ultraviolet absorber is UV-531 or UV-327.

[0007] Preferably, in step (2), the ratio of chain extender flame retardant to N,N-dimethylacetamide is 9.8-20g:75-150mL; the stirring conditions are: stirring temperature is 80-90℃, stirring time is 1.5-2.5h; the dimensions of the self-curing sticker are: width is 90mm, length is 280mm, and thickness is 1.8mm; the vacuuming time is 10-15min; the packaging method is: vacuum packaging in a high-barrier aluminum-plastic composite film bag.

[0008] Preferably, the preparation method of the chain extender flame retardant includes the following steps: Vanillylamine hydrochloride was added to water and stirred to obtain solution A; bis-(5-formylfurfuryl) ether was added to ethanol and stirred to obtain solution B; solution B was added dropwise to solution A and stirred to react, then DOPO was added and the reaction continued. The mixture was cooled to room temperature, impurities were removed, and the mixture was dried under vacuum to obtain the chain extender flame retardant.

[0009] In the above process, the amino group of vanillin hydrochloride reacts with the aldehyde group of bis-(5-formylfurfural) ether to form an imine bond C=N, which is then grafted with the PH bond of DOPO to obtain a chain extender flame retardant with hydroxyl groups.

[0010] Preferably, the ratio of vanillylamine hydrochloride, water, bis-(5-formylfurfuryl) ether, ethanol, and DOPO is 44.8-89g:60-120mL:30.7-61g:60-120mL:28.1-56g; stirring conditions: stirring temperature 40-50℃, stirring time 10-20min; re-stirring conditions: re-stirring temperature 50-60℃, re-stirring time 10-20min; dropwise addition method: solution B is added dropwise to solution A stirred at 400-600rpm over 40-60min; stirring reaction conditions: stirring reaction temperature 55-65℃, stirring reaction time 2.5-3.5h; continued reaction time 3.5-4.5h; impurity removal method: vacuum filtration, washing with methanol 3-5 times; vacuum drying conditions: vacuum drying temperature 65-75℃, vacuum drying time 5.5-6.5h.

[0011] Preferably, the method for preparing the modified halloysite includes the following steps: S1: 3-Aminopropyltriethoxysilane and triethylamine were added to toluene to obtain a mixture. A solution of hexachlorocyclotriphosphazene was added dropwise to the mixture. The mixture was reacted and impurities were removed to obtain silane-modified hexachlorocyclotriphosphazene. In the above process, the amino group of 3-aminopropyltriethoxysilane reacts with the chlorine atom of hexachlorocyclotriphosphazene for grafting.

[0012] S2: Silane-modified hexachlorocyclotriphosphazene was added to glacial acetic acid solution under ultrasonication to obtain hydrolyzed silane-modified hexachlorocyclotriphosphazene; S3: Halloysite was added to glacial acetic acid solution under ultrasonication, and then dropped into hydrolyzed silane-modified hexachlorocyclotriphosphazene. The mixture was stirred continuously, ammonia was added dropwise, and stirring was continued under reflux conditions to remove impurities and obtain modified halloysite.

[0013] In the above process, the Si-OH of hydrolyzed silane-modified hexachlorocyclotriphosphazene reacts with the hydroxyl groups on the surface of halloysite to obtain modified halloysite.

[0014] Preferably, in step S1, the ratio of 3-aminopropyltriethoxysilane, triethylamine, and toluene is 42-84 g: 21-42 mL: 100-200 mL; the hexachlorocyclotriphosphazene solution is prepared by dissolving 10-20 g of hexachlorocyclotriphosphazene in 40-80 mL of toluene; the reaction conditions are: a reaction temperature of 100 °C and a reaction time of 3.5-4.5 h; the impurity removal method is: filtering the mixture to remove triethylamine hydrochloride, and removing toluene from the filtrate by rotary evaporation.

[0015] Preferably, in step S2, the glacial acetic acid solution is prepared by adding 20-40 mL of glacial acetic acid to 1200-2400 mL of water to obtain an acetic acid solution; the ratio of silane-modified hexachlorocyclotriphosphazene to acetic acid solution is 30-60 g: 600-1200 mL.

[0016] Preferably, in step S3, the ratio of halloysite, glacial acetic acid solution, and ammonia is 5-10 g; 600-1200 mL: 40-80 mL; continuous stirring conditions: continuous stirring temperature 75-85℃, continuous stirring time 5.5-6.5 h; continued stirring time 14-18 h; impurity removal method: washing the product by centrifugation and freeze-drying; the concentration of ammonia is 1 mol / L.

[0017] The self-curing sticker is prepared using the aforementioned method.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The self-curing adhesive prepared by this invention can self-cur at room temperature in the air after a certain period of time without heating or other special processes. The cured materials are fused together, and the cured adhesive can be tightly attached to the protected part, with excellent sealing performance, excellent high temperature resistance and atmospheric aging resistance. The material has a flame retardant rating of up to V0, avoiding the risk of flame spread, and the on-site construction is flexible and convenient.

[0019] 2. This invention prepares a chain extender flame retardant with hydroxyl groups by reacting the amino group of vanillin hydrochloride with the aldehyde group of bis-(5-formylfurfuryl) ether, followed by grafting with DOPO. During polyurethane preparation, the chain extender flame retardant is introduced into the polyurethane network as a flame-retardant chain extender via the hydroxyl groups. Modified halloysite is obtained by grafting silane-modified phosphazene flame retardant onto the surface of halloysite nanotubes. The DOPO in the chain extender flame retardant and the phosphazene in the modified halloysite release non-flammable gases during combustion, diluting oxygen and combustibles, while simultaneously promoting char formation on the polymer surface, forming a dense char layer that isolates heat and oxygen. Through the synergistic flame retardancy of phosphorus-nitrogen-silicon, the flame retardancy of the self-curing adhesive is improved.

[0020] 3. This invention improves the compatibility with polyurethane by modifying halloysite to enhance its hydrophobicity, resulting in a nanofiller with nano-reinforcement and shielding properties. This prevents the self-curing tape from becoming brittle and forms a dense and strong hydrogen bond network with polyurethane. During polymer curing, the polyurethane molecular chains physically entwine around the halloysite nanotubes, forming a mechanically interlocked structure. This enhances the barrier properties and mechanical strength of the self-curing tape while maintaining high elasticity. Together with the rigid crosslinking point chain extender flame retardant, it synergistically improves the mechanical properties of the self-curing tape.

[0021] 4. This invention effectively absorbs ultraviolet light through aromatic groups, and works synergistically with ultraviolet absorbers to improve ultraviolet durability. The dense cross-linked network and aromatic ring structure resist degradation by heat and oxygen. Modified halloysite forms tortuous paths in the polymer, reducing water vapor permeability, preventing moisture intrusion, and improving resistance to damp heat aging. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a physical image of the self-curing adhesive of the present invention; Figure 2 These are actual construction photos of the self-curing adhesive tape of this invention; Figure 3 This is a bar chart showing the mechanical properties of the self-curing adhesive of the present invention; Figure 4 This is a line graph showing the water vapor transmission rate of the self-curing sticker of the present invention; Figure 5 This is a bar chart showing the adhesive force of the self-curing adhesive of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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. Example

[0025] This embodiment discloses a method for preparing a chain extender flame retardant, including the following steps: 67.2 g of vanillylamine hydrochloride was added to 90 mL of water and stirred at 45 °C for 15 min to obtain solution A; 45 g of bis-(5-formylfurfuryl) ether was added to 90 mL of ethanol and stirred at 55 °C for 15 min to obtain solution B; solution B was added dropwise to solution A under stirring at 500 rpm over 50 min, and the reaction was stirred at 60 °C for 3 h, 42 g of DOPO was added, and the reaction was continued for 3.5-4.5 h, cooled to room temperature, filtered under reduced pressure, washed 4 times with methanol, and dried under vacuum at 70 °C for 6 h to obtain the chain extender flame retardant. Example

[0026] This embodiment discloses a method for preparing modified halloysite, including the following steps: S1: 63g of 3-aminopropyltriethoxysilane and 31.5mL of triethylamine were added to 150mL of toluene to obtain a mixture. 15g of hexachlorocyclotriphosphazene was dissolved in 60mL of toluene to obtain a hexachlorocyclotriphosphazene solution, which was then added dropwise to the mixture. The mixture was reacted at 100℃ for 4h. The mixture was filtered to remove triethylamine hydrochloride, and toluene was removed by rotary evaporation to obtain silane-modified hexachlorocyclotriphosphazene. S2: Add 30 mL of glacial acetic acid to 1800 mL of water to obtain an acetic acid solution. Add 45 g of silane-modified hexachlorocyclotriphosphazene to 900 mL of acetic acid solution under ultrasonication to obtain hydrolyzed silane-modified hexachlorocyclotriphosphazene. S3: 7.5g halloysite was added to 900mL of glacial acetic acid solution under ultrasonication, and then added dropwise to hexachlorocyclotriphosphazene modified with hydrolyzed silane. The mixture was stirred continuously at 80℃ for 6h, and 60mL of ammonia water was added dropwise. The mixture was stirred under reflux for 14-18h. The product was washed by centrifugation and then freeze-dried to obtain modified halloysite. Example

[0027] This embodiment discloses a method for preparing a self-curing adhesive tape, including the following steps: Step (1) Under a nitrogen atmosphere, 35g of polytetramethylene ether glycol was vacuum heated at 120°C for 120min. After cooling to 80°C, 17g of isophorone diisocyanate, 0.3mL of DBTDL, 2g of pigment, 0.45g of UV absorber UV-531 and 150mL of N,N-dimethylacetamide were added. The mixture was stirred at 80°C for 2h. Then, 75mL of the modified halloysite dispersion prepared in Example 2 was added and stirred at 80°C for 1h to obtain the prepolymer. Step (2) Add 15g of the chain extender flame retardant prepared in Example 1 to 115mL of N,N-dimethylacetamide, then drop it into the prepolymer, continue stirring at 85℃ for 2h, pour it into a mold that is 90mm wide, 280mm long and 1.8mm thick while hot, vacuum for 12min to remove air bubbles, put it into a high-barrier aluminum-plastic composite film bag for vacuum packaging, and obtain a self-curing sticker.

[0028] The modified halloysite dispersion was prepared by dispersing modified halloysite in N,N-dimethylacetamide to obtain a 6wt% modified halloysite dispersion. Example

[0029] This embodiment discloses a method for preparing a self-curing adhesive tape, including the following steps: Step (1) Under a nitrogen atmosphere, 20g of polytetramethylene ether glycol was vacuum heated at 125°C for 110min. After cooling to 85°C, 12g of isophorone diisocyanate, 0.2mL of DBTDL, 1g of pigment, 0.3g of UV absorber UV-327 and 100mL of N,N-dimethylacetamide were added. The mixture was stirred at 85°C for 1.5h. Then, 100mL of the modified halloysite dispersion prepared in Example 2 was added and stirred at 75°C for 1h to obtain the prepolymer. Step (2) Add 9.8g of the chain extender flame retardant prepared in Example 1 to 150mL of N,N-dimethylacetamide, then drop it into the prepolymer, continue stirring at 80℃ for 2.5h, pour it into a mold with a width of 90mm × 280mm in length × 1.8mm in thickness while hot, vacuum for 10min to remove air bubbles, put it into a high-barrier aluminum-plastic composite film bag for vacuum packaging, and obtain a self-curing sticker.

[0030] The modified halloysite dispersion is prepared by dispersing modified halloysite in N,N-dimethylacetamide to obtain a 5wt% modified halloysite dispersion. Example

[0031] This embodiment discloses a method for preparing a self-curing adhesive tape, including the following steps: Step (1) Under a nitrogen atmosphere, 40g of polytetramethylene ether glycol was vacuum heated at 115°C for 130min. After cooling to 75°C, 19g of isophorone diisocyanate, 0.4mL of DBTDL, 3g of pigment, 0.6g of UV absorber UV-531 and 200mL of N,N-dimethylacetamide were added. The mixture was stirred at 75°C for 2.5h. Then, 50mL of the modified halloysite dispersion prepared in Example 2 was added and stirred at 85°C for 0.5h to obtain the prepolymer. Step (2) Add 20g of the chain extender flame retardant prepared in Example 1 to 120mL of N,N-dimethylacetamide, then drop it into the prepolymer, continue stirring at 90℃ for 1.5h, pour it into a mold that is 90mm wide, 280mm long and 1.8mm thick while hot, vacuum for 15min to remove air bubbles, put it into a high-barrier aluminum-plastic composite film bag for vacuum packaging, and obtain a self-curing sticker.

[0032] The modified halloysite dispersion is prepared by dispersing modified halloysite in N,N-dimethylacetamide to obtain an 8wt% modified halloysite dispersion.

[0033] Comparative Example 1 Compared with Example 3, Comparative Example 1 used an equal mass of polytetramethylene ether glycol to replace the chain extender flame retardant in the preparation of the self-curing sticker, and did not add modified halloysite dispersion, while keeping other conditions unchanged.

[0034] Comparative Example 2 Compared with Example 3, Comparative Example 2 used an equal mass of polytetramethylene ether glycol to replace the chain extender flame retardant in the preparation of the self-curing sticker, while keeping other conditions unchanged.

[0035] Comparative Example 3 Compared with Example 3, Comparative Example 3 did not add modified halloysite dispersion during the preparation of self-curing stickers, and all other conditions remained unchanged.

[0036] Comparative Example 4 Compared with Example 3, Comparative Example 4 used an equal mass of halloysite to replace the modified halloysite in the preparation of the self-curing sticker, while keeping other conditions unchanged.

[0037] Comparative Example 5 Compared with Example 3, Comparative Example 5 used an equal mass of DOPO to replace the chain extender flame retardant in the preparation of the self-curing sticker, while keeping other conditions unchanged.

[0038] Experimental Example The self-curing adhesive tapes prepared in Examples 3-5 and Comparative Examples 1-5 are designated as A, B, C, D, E, F, G, and H, respectively. Their performance was tested, and the test standards and results are shown in Table 2. Tensile strength and elongation at break: tested using a universal tensile testing machine according to GB / T 528-2009 standard; Flame retardancy (UL-94): vertical burning test according to ANSI / UL 94-2013 standard; High temperature aging test requirements: 90℃, 7 days, 1 meter water depth, 4 hours, no cracking or leakage; Low temperature aging test requirements: 90℃, 7 days, 1 meter water depth, 4 hours, no cracking or leakage; Double 85 aging test requirements: 85℃, 85%, 1000 hours, 1 meter water depth, 4 hours, no cracking or leakage; UV aging test requirements: according to GB / T 16422, 2000 hours, no cracking; Water vapor transmission rate test requirements: according to GB / T 21529-2008 standard, under conditions of 38℃ and 90% relative humidity (RH), the water vapor transmission rate of the sample is tested, unit g / m 2 • day; Test results are shown in Tables 1 and 2: Table 1

[0039] Table 2

[0040] Based on Tables 1 and 2, and from Examples 3-5 and Comparative Examples 1-5, the self-curing adhesive tape prepared in Example 3 of this invention exhibits good strength, flame retardancy, adhesion, durability, and barrier properties. A comparison between Comparative Examples 1-5 and Examples 3-5 shows that the lack of chemically bonded chain extenders and flame retardants reduces the stability of the crosslinking network, resulting in decreased strength, flame retardancy, durability, and barrier properties of the self-curing adhesive tape. Direct physical mixing of DOPO damages the polyurethane structure, further reducing its performance. The lack of nano-reinforcement and shielding effects from modified halloysite reduces the strength and barrier properties of the self-curing adhesive tape, and the lack of flame retardant synergy further reduces its flame retardancy. Unmodified halloysite has poor compatibility with the matrix; therefore, other methods are not as effective as those of this invention.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0042] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a self-curing adhesive tape, characterized in that, Includes the following steps: Step (1) Under a nitrogen atmosphere, polytetramethylene ether glycol is vacuum heated and cooled. Then, isophorone diisocyanate, DBTDL, pigment, UV absorber and N,N-dimethylacetamide are added and stirred. Then, modified halloysite dispersion is added and stirred to obtain the prepolymer. Step (2) Add the chain extender flame retardant to N,N-dimethylacetamide, then drop it into the prepolymer prepared in step (1), continue stirring, pour it into the mold while hot, vacuum and package it to obtain the self-curing sticker.

2. The method for preparing the self-curing adhesive tape according to claim 1, characterized in that, In step (1), the ratio of polytetramethylene ether glycol, isophorone diisocyanate, DBTDL, pigment, UV absorber, N,N-dimethylacetamide, and modified halloysite dispersion is 20-40g:12-19g:0.2-0.4mL:1-3g:0.3-0.6g:100-200mL:50-100mL; the vacuum heating conditions are: vacuum heating temperature of 115-125℃ and vacuum heating time of 110-130min. n; Cooling temperature is 75-85℃; Stirring conditions: stirring temperature is 75-85℃, stirring time is 1.5-2.5h; The preparation method of modified halloysite dispersion is: dispersing modified halloysite in N,N-dimethylacetamide to obtain 5-8wt% modified halloysite dispersion; Continued stirring conditions: continued stirring temperature is 75-85°C, continued stirring time is 0.5-1h; The number average molecular weight of polytetramethylene ether glycol is 2000g / mol.

3. The method for preparing the self-curing adhesive tape according to claim 1, characterized in that, In step (2), the ratio of chain extender flame retardant to N,N-dimethylacetamide is 9.8-20g:75-150mL; the stirring conditions are as follows: the stirring temperature is 80-90℃ and the stirring time is 1.5-2.5h; the dimensions of the self-curing sticker are 90mm wide, 280mm long, and 1.8mm thick; the vacuuming time is 10-15min; and the packaging method is to vacuum pack it in a high-barrier aluminum-plastic composite film bag.

4. The method for preparing the self-curing adhesive tape according to claim 1, characterized in that, The preparation method of the chain extender flame retardant includes the following steps: Vanillylamine hydrochloride was added to water and stirred to obtain solution A; bis-(5-formylfurfuryl) ether was added to ethanol and stirred to obtain solution B; solution B was added dropwise to solution A and stirred to react, then DOPO was added and the reaction continued. The mixture was cooled to room temperature, impurities were removed, and the mixture was dried under vacuum to obtain the chain extender flame retardant.

5. The method for preparing the self-curing adhesive tape according to claim 4, characterized in that, The ratio of vanillylamine hydrochloride, water, bis-(5-formylfurfuryl) ether, ethanol, and DOPO is 44.8-89 g: 60-120 mL: 30.7-61 g: 60-120 mL: 28.1-56 g; stirring conditions: stirring temperature 40-50℃, stirring time 10-20 min; re-stirring conditions: re-stirring temperature 50-60℃, re-stirring time 10-20 min; dropwise addition method: solution B is added dropwise to solution A stirred at 400-600 rpm over 40-60 min; stirring reaction conditions: stirring reaction temperature 55-65℃, stirring reaction time 2.5-3.5 h; continued reaction time 3.5-4.5 h; impurity removal method: vacuum filtration, washing with methanol 3-5 times; vacuum drying conditions: vacuum drying temperature 65-75℃, vacuum drying time 5.5-6.5 h.

6. The method for preparing the self-curing adhesive tape according to claim 1, characterized in that, The method for preparing the modified halloysite includes the following steps: S1: 3-Aminopropyltriethoxysilane and triethylamine were added to toluene to obtain a mixture. A solution of hexachlorocyclotriphosphazene was added dropwise to the mixture. The mixture was reacted and impurities were removed to obtain silane-modified hexachlorocyclotriphosphazene. S2: Silane-modified hexachlorocyclotriphosphazene was added to glacial acetic acid solution under ultrasonication to obtain hydrolyzed silane-modified hexachlorocyclotriphosphazene; S3: Halloysite was added to glacial acetic acid solution under ultrasonication, and then dropped into hydrolyzed silane-modified hexachlorocyclotriphosphazene. The mixture was stirred continuously, ammonia was added dropwise, and stirring was continued under reflux conditions to remove impurities and obtain modified halloysite.

7. The method for preparing the self-curing adhesive tape according to claim 6, characterized in that, In S1, the ratio of 3-aminopropyltriethoxysilane, triethylamine, and toluene is 42-84g:21-42mL:100-200mL; the hexachlorocyclotriphosphazene solution is prepared by dissolving 10-20g of hexachlorocyclotriphosphazene in 40-80mL of toluene; the reaction conditions are: the reaction temperature is 100℃ and the reaction time is 3.5-4.5h; the impurity removal method is: filtering the mixture to remove triethylamine hydrochloride, and removing toluene from the filtrate by rotary evaporation.

8. The method for preparing the self-curing adhesive tape according to claim 6, characterized in that, In S2, the glacial acetic acid solution is prepared by adding 20-40 mL of glacial acetic acid to 1200-2400 mL of water to obtain the glacial acetic acid solution; the ratio of silane-modified hexachlorocyclotriphosphazene to acetic acid solution is 30-60 g: 600-1200 mL.

9. The method for preparing the self-curing adhesive tape according to claim 6, characterized in that, In step S3, the ratio of halloysite, glacial acetic acid solution, and ammonia is 5-10 g: 600-1200 mL: 40-80 mL; the continuous stirring conditions are: continuous stirring temperature of 75-85℃, continuous stirring time of 5.5-6.5 h, and continued stirring time of 14-18 h; the impurity removal method is: washing the product by centrifugation and then freeze-drying; the concentration of ammonia is 1 mol / L.

10. A self-curing adhesive tape prepared by the method according to any one of claims 1-9.

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