Superstrong water-based adhesive and method for preparing the same
By introducing a dispersion system of aluminum salts, cellulose nanocrystals, and amorphous calcium carbonate into an aqueous adhesive, and utilizing the in-situ polymerization of polyurethane monomers to form an organic-inorganic hybrid structure, the problem of unstable bonding strength in traditional aqueous adhesives is solved, achieving high strength and water resistance, and avoiding the use of toxic substances.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUIZHOU GUANGHUI FLOOR ENGINEERING CO LTD
- Filing Date
- 2026-03-26
- Publication Date
- 2026-05-29
AI Technical Summary
Traditional water-based adhesives have large fluctuations in bonding strength, which cannot meet the needs of long-term use, and the use of toxic raw materials in the production process poses a threat to the environment and human health.
In situ polymerization of polyurethane monomers was carried out in a dispersion system of aluminum salt, sodium carboxymethyl cellulose, and cellulose nanocrystals to form an ionogel structure and chemical bonding with nanofillers. Combined with acrylic acid polymerization to encapsulate amorphous calcium carbonate, the nanoparticles were uniformly dispersed in the polymer matrix, forming an organic-inorganic hybrid reinforcement structure.
It significantly enhances the adhesive's bonding strength and water resistance, provides stable bonding results, and avoids the use of toxic raw materials.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of adhesive technology, specifically to a super-strong adhesive water-based adhesive and its preparation method. Background Technology
[0002] In modern industrial production and consumer applications, adhesives, as the core materials for bonding materials, directly determine the structural stability, service life, and safety and reliability of products. Adhesion, as a core indicator of adhesives, is a critical requirement across various application scenarios. Adhesives can be used to bond various substrates such as wood, metal, and plastics, and are applicable in fields such as automobiles, construction, and medicine. Huge market demand has driven the rapid development of the adhesive industry. However, many adhesive production processes inevitably involve the use of toxic raw materials, causing serious environmental pollution and posing threats to human health during use. With increasing environmental and health awareness, the requirements for adhesives are no longer limited to their functionality; therefore, developing "environmentally friendly, healthy, and safe" adhesives is quite urgent.
[0003] Water-based adhesives, also known as water-based adhesives, are environmentally friendly adhesives made from natural or synthetic polymers as raw materials and water as a solvent or dispersion medium, replacing toxic organic solvents that pollute the environment. While traditional water-based adhesives meet environmental standards, their bond strength fluctuates greatly (deviation exceeding 20%), failing to meet long-term usage requirements. Bonding failure can lead to equipment malfunctions, highlighting the importance of superior adhesion and performance stability. Summary of the Invention
[0004] The purpose of this invention is to provide a super-strong adhesive water-based adhesive and its preparation method, so as to solve the problems existing in the prior art.
[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing a super-strong adhesive water-based adhesive, comprising the following steps: (1) Mix aluminum salt, sodium carboxymethyl cellulose and deionized water, adjust the pH of the solution to 8-9 with sodium hydroxide solution, then add cellulose nanocrystal dispersion, heat to 50℃, stir at 200 rpm for 2 hours, and spray dry to obtain filler A; (2) Amorphous calcium carbonate was reacted with acrylic acid and initiator under nitrogen protection at a flow rate of 70 mL / min, and solvent was added at the same time. The mixture was stirred at 60~80℃ and 500 rpm for 3~6 h. Then it was washed three times with ethanol and deionized water in sequence and dried at 80℃ for 12 h to obtain filler B. (3) Premix filler A, filler B and deionized water, stir at 1000~2000 rpm for 30~80 min, then add isocyanate, polyol and catalyst, and carry out polymerization reaction at 60~80℃ for 2~4 h. Finally, add neutralizer and preservative to obtain super strong adhesive water-based adhesive.
[0006] Furthermore, in step (1), the mass ratio of aluminum salt, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water is 1:1:10:10~30.
[0007] Furthermore, the aluminum salt in step (1) is at least one of aluminum chloride, aluminum nitrate, and aluminum sulfate.
[0008] Further, the preparation method of the cellulose nanocrystal dispersion in step (1) is as follows: microcrystalline cellulose and 15wt% sulfuric acid solution are hydrolyzed at 60℃ for 4-6 hours at a mass ratio of 1:10. Then, the pH of the solution is adjusted to 5 with sodium hydroxide solution, and then dispersed in deionized water by ultrasonic treatment at 30kHz for 20 minutes. After centrifugation at 12000rpm for 20 minutes, the solid is taken and dispersed again in deionized water until the solid content is 3%, thus obtaining the cellulose nanocrystal dispersion.
[0009] Furthermore, the process parameters for spray drying in step (1) are as follows: the drying gas is nitrogen, the nitrogen flow rate is 8L / min, the inlet air temperature is 180~220℃, the outlet air temperature is 80~100℃, the atomization speed is 15000~25000rpm, and the feed rate is 20mL / min.
[0010] Furthermore, the particle size of filler A in step (1) is 10~50μm.
[0011] Furthermore, in step (2), the mass ratio of amorphous calcium carbonate, acrylic acid, initiator, and solvent is 10:0.1:0.01:15~30.
[0012] Furthermore, in step (3), the mass ratio of filler A, filler B, deionized water, isocyanate, polyol, catalyst, neutralizer, and preservative is 1:1:5~10:1.2:1:0.007:0.02:0.01.
[0013] Furthermore, the isocyanate in step (3) is at least one of diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
[0014] Furthermore, the polyol mentioned in step (3) is at least one of polyethylene adipate and polyoxypropylene ether.
[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention achieves excellent adhesive strength and water resistance by in-situ polymerization of polyurethane monomers in a dispersion system of aluminum gel, cellulose nanocrystals, and surface-carboxylated amorphous calcium carbonate, thereby realizing chemical bonding and uniform dispersion between the nanofiller and the polymer matrix. Specifically, aluminum ions and sodium carboxymethyl cellulose form an ionogel structure through a coordination reaction, with ionic bonds providing strong interfacial bonding and enhancing the mechanical interlocking between the adhesive and the substrate. Simultaneously, acrylic acid polymerization encapsulates the amorphous calcium carbonate, introducing carboxyl groups. These carboxyl groups react with the isocyanate groups of the polyurethane to generate acylurea or amide structures, stabilizing the nanoparticles and allowing calcium carbonate to diffuse into the polyurethane matrix. This achieves an organic-inorganic hybrid reinforcement structure in the adhesive, significantly enhancing the adhesive strength and water resistance. Furthermore, the in-situ polymerization of polyurethane monomers in the presence of nanofillers forms a composite structure with the polymer as the continuous phase and the nanofiller as the dispersed phase, stabilizing the crystal form of calcium carbonate and the mechanical properties of the adhesive, thereby enhancing the overall structural integrity of the matrix and further improving the adhesive strength and water resistance. Detailed Implementation
[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0017] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The test methods for various indicators of the super-strong adhesive water-based adhesive prepared in the following embodiments are as follows: The super-strong adhesive water-based adhesive is applied at 200g / m 2 The coating was applied to a 100mm*25mm*3mm poplar board, and then the two poplar boards were pressed together and dried at 80℃ for 4 hours. The composite board was then tested.
[0018] The composite board was subjected to a tensile test using a universal tensile testing machine at a tensile speed of 20 mm / min. The maximum force at the moment of being stretched was recorded, which is the bonding strength. Then, a water resistance test was conducted by immersing the composite board in water at 65°C for 5 consecutive days without drying. The composite board was then stretched again using the universal tensile testing machine to test its strength retention rate.
[0019] Example 1
[0020] (1) Microcrystalline cellulose and 15wt% sulfuric acid solution were hydrolyzed at 60℃ for 4 hours at a mass ratio of 1:10. Then, the pH of the solution was adjusted to 5 with sodium hydroxide solution. The solution was then dispersed in deionized water by ultrasonic treatment at 30kHz for 20 minutes. After centrifugation at 12000rpm for 20 minutes, the solid was collected and dispersed again in deionized water until the solid content was 3%, thus obtaining a cellulose nanocrystal dispersion. Aluminum chloride, sodium carboxymethyl cellulose, and deionized water were mixed and the pH of the solution was adjusted to 8 with sodium hydroxide solution. Then, cellulose nanocrystal dispersion was added, the temperature was raised to 50℃, and the mixture was stirred at 200 rpm for 2 hours. After spray drying, the process parameters were: drying gas was nitrogen, nitrogen flow rate was 8 L / min, inlet air temperature was 180℃, outlet air temperature was 80℃, atomization speed was 15000 rpm, and feed rate was 20 mL / min, yielding filler A. The mass ratio of aluminum chloride, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water was 1:1:10:10; the particle size of filler A was 10 μm. (2) Amorphous calcium carbonate was reacted with acrylic acid and an initiator under nitrogen protection at a flow rate of 70 mL / min, while solvent was added. The mixture was stirred at 60°C and 500 rpm for 3 h, then washed three times with ethanol and deionized water, and dried at 80°C for 12 h to obtain filler B. The mass ratio of amorphous calcium carbonate, acrylic acid, initiator and solvent was 10:0.1:0.01:15. The particle size of amorphous calcium carbonate was 50 nm. The initiator was ammonium persulfate. The solvent was 30 wt% ethanol-water solution. (3) Premix filler A, filler B, and deionized water, stir at 1000 rpm for 30 min, then add isocyanate, polyol and catalyst, and carry out polymerization reaction at 60℃ for 2 h. Finally, add neutralizer and preservative to obtain super-strong adhesive water-based adhesive; the mass ratio of filler A, filler B, deionized water, diphenylmethane diisocyanate, polyethylene adipate, catalyst, neutralizer and preservative is 1:1:5:1.2:1:0.007:0.02:0.01; the catalyst is dibutyltin dilaurate; the neutralizer is triethylamine; the preservative is isothiazolinone.
[0021] Example 2
[0022] (1) Microcrystalline cellulose and 15wt% sulfuric acid solution were hydrolyzed at 60℃ for 5h at a mass ratio of 1:10. Then, the pH of the solution was adjusted to 5 with sodium hydroxide solution. The solution was then dispersed in deionized water by ultrasonic treatment at 30kHz for 20min. After centrifugation at 12000rpm for 20min, the solid was collected and dispersed again in deionized water until the solid content was 3%, thus obtaining a cellulose nanocrystal dispersion. Aluminum chloride, sodium carboxymethyl cellulose and deionized water were mixed and the pH of the solution was adjusted to 8 with sodium hydroxide solution. 5. Then, add the cellulose nanocrystal dispersion, heat to 50℃, stir at 200 rpm for 2 hours, and spray dry. The process parameters are: drying gas is nitrogen, nitrogen flow rate is 8 L / min, inlet air temperature is 200℃, outlet air temperature is 90℃, atomization speed is 20000 rpm, and feed rate is 20 mL / min to obtain filler A; the mass ratio of aluminum chloride, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water is 1:1:10:20; the particle size of filler A is 30 μm. (2) Amorphous calcium carbonate was reacted with acrylic acid and an initiator under nitrogen protection at a flow rate of 70 mL / min, while solvent was added. The mixture was stirred at 70°C and 500 rpm for 4 h, then washed three times with ethanol and deionized water, and dried at 80°C for 12 h to obtain filler B. The mass ratio of amorphous calcium carbonate, acrylic acid, initiator and solvent was 10:0.1:0.01:23. The particle size of amorphous calcium carbonate was 50 nm. The initiator was ammonium persulfate. The solvent was 30 wt% ethanol-water solution. (3) Premix filler A, filler B, and deionized water, stir at 1500 rpm for 60 min, then add isocyanate, polyol and catalyst, and carry out polymerization reaction at 70℃ for 3 h. Finally, add neutralizer and preservative to obtain super-strong adhesive water-based adhesive; the mass ratio of filler A, filler B, deionized water, diphenylmethane diisocyanate, polyethylene adipate, catalyst, neutralizer and preservative is 1:1:8:1.2:1:0.007:0.02:0.01; the catalyst is dibutyltin dilaurate; the neutralizer is triethylamine; the preservative is isothiazolinone.
[0023] Example 3
[0024] (1) Microcrystalline cellulose and 15wt% sulfuric acid solution were hydrolyzed at 60℃ for 6 hours at a mass ratio of 1:10. Then, the pH of the solution was adjusted to 5 with sodium hydroxide solution. The solution was then dispersed in deionized water by ultrasonic treatment at 30kHz for 20 minutes. After centrifugation at 12000rpm for 20 minutes, the solid was collected and dispersed again in deionized water until the solid content was 3%, thus obtaining a cellulose nanocrystal dispersion. Aluminum chloride, sodium carboxymethyl cellulose, and deionized water were mixed and the pH of the solution was adjusted to 9 with sodium hydroxide solution. Then, cellulose nanocrystal dispersion was added, the temperature was raised to 50℃, and the mixture was stirred at 200 rpm for 2 hours. After spray drying, the process parameters were: drying gas was nitrogen, nitrogen flow rate was 8 L / min, inlet air temperature was 220℃, outlet air temperature was 100℃, atomization speed was 25000 rpm, and feed rate was 20 mL / min, yielding filler A. The mass ratio of aluminum chloride, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water was 1:1:10:30; the particle size of filler A was 50 μm. (2) Amorphous calcium carbonate was reacted with acrylic acid and an initiator under nitrogen protection at a flow rate of 70 mL / min, while solvent was added. The mixture was stirred at 80°C and 500 rpm for 6 h, then washed three times with ethanol and deionized water, and dried at 80°C for 12 h to obtain filler B. The mass ratio of amorphous calcium carbonate, acrylic acid, initiator and solvent was 10:0.1:0.01:30. The particle size of amorphous calcium carbonate was 50 nm. The initiator was ammonium persulfate. The solvent was 30 wt% ethanol-water solution. (3) Premix filler A, filler B, and deionized water, stir at 2000 rpm for 80 min, then add isocyanate, polyol and catalyst, and carry out polymerization reaction at 80℃ for 4 h. Finally, add neutralizer and preservative to obtain super-strong adhesive water-based adhesive; the mass ratio of filler A, filler B, deionized water, diphenylmethane diisocyanate, polyethylene adipate, catalyst, neutralizer and preservative is 1:1:10:1.2:1:0.007:0.02:0.01; the catalyst is dibutyltin dilaurate; the neutralizer is triethylamine; the preservative is isothiazolinone.
[0025] Example 4
[0026] (1) Microcrystalline cellulose and 15wt% sulfuric acid solution were hydrolyzed at 60℃ for 5h at a mass ratio of 1:10. Then, the pH of the solution was adjusted to 5 with sodium hydroxide solution. The solution was then dispersed in deionized water by ultrasonic treatment at 30kHz for 20min. After centrifugation at 12000rpm for 20min, the solid was collected and dispersed again in deionized water until the solid content was 3%, thus obtaining a cellulose nanocrystal dispersion. Aluminum chloride, sodium carboxymethyl cellulose and deionized water were mixed and the pH of the solution was adjusted to 8 with sodium hydroxide solution. 5. Then, add the cellulose nanocrystal dispersion, heat to 50℃, stir at 200 rpm for 2 hours, and spray dry. The process parameters are: drying gas is nitrogen, nitrogen flow rate is 8 L / min, inlet air temperature is 200℃, outlet air temperature is 90℃, atomization speed is 20000 rpm, and feed rate is 20 mL / min to obtain filler A; the mass ratio of aluminum chloride, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water is 1:1:10:20; the particle size of filler A is 30 μm. (2) Amorphous calcium carbonate was reacted with acrylic acid and an initiator under nitrogen protection at a flow rate of 70 mL / min, while solvent was added. The mixture was stirred at 70°C and 500 rpm for 4 h, then washed three times with ethanol and deionized water, and dried at 80°C for 12 h to obtain filler B. The mass ratio of amorphous calcium carbonate, acrylic acid, initiator and solvent was 10:0.1:0.01:23. The particle size of amorphous calcium carbonate was 50 nm. The initiator was ammonium persulfate. The solvent was 30 wt% ethanol-water solution. (3) Premix filler A, filler B, and deionized water, stir at 1500 rpm for 60 min, then add isocyanate, polyol and catalyst, and carry out polymerization reaction at 70℃ for 3 h. Finally, add neutralizer and preservative to obtain super-strong adhesive water-based adhesive; the mass ratio of filler A, filler B, deionized water, diphenylmethane diisocyanate, polyethylene adipate, catalyst, neutralizer and preservative is 0.5:1:8:1.2:1:0.007:0.02:0.01; the catalyst is dibutyltin dilaurate; the neutralizer is triethylamine; the preservative is isothiazolinone.
[0027] Example 5
[0028] (1) Microcrystalline cellulose and 15wt% sulfuric acid solution were hydrolyzed at 60℃ for 5h at a mass ratio of 1:10. Then, the pH of the solution was adjusted to 5 with sodium hydroxide solution. The solution was then dispersed in deionized water by ultrasonic treatment at 30kHz for 20min. After centrifugation at 12000rpm for 20min, the solid was collected and dispersed again in deionized water until the solid content was 3%, thus obtaining a cellulose nanocrystal dispersion. Aluminum chloride, sodium carboxymethyl cellulose and deionized water were mixed and the pH of the solution was adjusted to 8 with sodium hydroxide solution. 5. Then, add the cellulose nanocrystal dispersion, heat to 50℃, stir at 200 rpm for 2 hours, and spray dry. The process parameters are: drying gas is nitrogen, nitrogen flow rate is 8 L / min, inlet air temperature is 200℃, outlet air temperature is 90℃, atomization speed is 20000 rpm, and feed rate is 20 mL / min to obtain filler A; the mass ratio of aluminum chloride, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water is 1:1:10:20; the particle size of filler A is 30 μm. (2) Amorphous calcium carbonate was reacted with acrylic acid and an initiator under nitrogen protection at a flow rate of 70 mL / min, while solvent was added. The mixture was stirred at 70°C and 500 rpm for 4 h, then washed three times with ethanol and deionized water, and dried at 80°C for 12 h to obtain filler B. The mass ratio of amorphous calcium carbonate, acrylic acid, initiator and solvent was 10:0.1:0.01:23. The particle size of amorphous calcium carbonate was 50 nm. The initiator was ammonium persulfate. The solvent was 30 wt% ethanol-water solution. (3) Premix filler A, filler B, and deionized water, stir at 1500 rpm for 60 min, then add isocyanate, polyol and catalyst, and carry out polymerization reaction at 70℃ for 3 h. Finally, add neutralizer and preservative to obtain super-strong adhesive water-based adhesive; the mass ratio of filler A, filler B, deionized water, diphenylmethane diisocyanate, polyethylene adipate, catalyst, neutralizer and preservative is 1:0.5:8:1.2:1:0.007:0.02:0.01; the catalyst is dibutyltin dilaurate; the neutralizer is triethylamine; the preservative is isothiazolinone.
[0029] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that cellulose nanocrystals are not added; the remaining steps are the same as in Example 2.
[0030] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that step (1) is omitted, and step (3) is changed to: premixing cellulose nanocrystals, filler B, and deionized water, stirring at 1500 rpm for 60 min, then adding isocyanate, polyol, and catalyst, and carrying out polymerization reaction at 70°C for 3 h, and finally adding neutralizer and preservative to obtain a super-strong adhesive water-based adhesive; the mass ratio of cellulose nanocrystals, filler B, deionized water, diphenylmethane diisocyanate, polyethylene adipate, catalyst, neutralizer, and preservative is 1:1:8:1.2:1:0.007:0.02:0.01; the catalyst is dibutyltin dilaurate; the neutralizer is triethylamine; the preservative is isothiazolinone; the remaining steps are the same as in Example 2.
[0031] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that filler B is not added; the remaining steps are the same as in Example 2.
[0032] Example of effect Table 1 below presents the performance analysis results of the super-strong adhesive water-based adhesives of Examples 1 to 5 and Comparative Examples 1 to 3 of the present invention.
[0033] Table 1
[0034] A comparison of the experimental data of the embodiments and comparative examples in Table 1 reveals that the present invention achieves chemical bonding and uniform dispersion of nanofillers and polymer matrix through in-situ polymerization of polyurethane monomers in a dispersion system of aluminum gel, cellulose nanocrystals, and surface carboxylated amorphous calcium carbonate. This results in excellent adhesive strength and water resistance. Specifically, aluminum ions and sodium carboxymethyl cellulose form an ion gel structure through coordination reaction, with ionic bonds providing strong interfacial bonding. Simultaneously, acrylic acid polymerization encapsulates amorphous calcium carbonate, thereby stabilizing the nanoparticles and allowing calcium carbonate to diffuse into the polyurethane matrix, achieving an organic-inorganic hybrid reinforcement structure for the adhesive. This significantly enhances the adhesive strength and water resistance of the substrate.
[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.
Claims
1. A method for preparing a super-strong adhesive water-based adhesive, characterized in that, Includes the following steps: (1) Mix aluminum salt, sodium carboxymethyl cellulose and deionized water, adjust the pH of the solution to 8-9 with sodium hydroxide solution, then add cellulose nanocrystal dispersion, and spray dry to obtain filler A; (2) Amorphous calcium carbonate was reacted with acrylic acid and an initiator under nitrogen protection, while a solvent was added. After washing and drying, filler B was obtained. (3) Premix filler A, filler B and deionized water, then add isocyanate, polyol and catalyst to carry out polymerization reaction, and finally add neutralizer and preservative to obtain super strong adhesive water-based adhesive.
2. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The mass ratio of aluminum salt, sodium carboxymethyl cellulose, cellulose nanocrystal dispersion, and deionized water in step (1) is 1:1:10:10~30.
3. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The aluminum salt mentioned in step (1) is at least one of aluminum chloride, aluminum nitrate, and aluminum sulfate.
4. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The preparation method of the cellulose nanocrystal dispersion in step (1) is as follows: microcrystalline cellulose and 15wt% sulfuric acid solution are hydrolyzed at 60℃ for 4-6 hours at a mass ratio of 1:
10. Then, the pH of the solution is adjusted to 5 with sodium hydroxide solution. The solution is then dispersed in deionized water by ultrasonic treatment at 30kHz for 20 minutes. After centrifugation at 12000rpm for 20 minutes, the solid is collected and dispersed again in deionized water until the solid content is 3%, thus obtaining the cellulose nanocrystal dispersion.
5. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The process parameters for spray drying in step (1) are as follows: the drying gas is nitrogen, the nitrogen flow rate is 8L / min, the inlet air temperature is 180~220℃, the outlet air temperature is 80~100℃, the atomization speed is 15000~25000rpm, and the feed rate is 20mL / min.
6. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The particle size of filler A in step (1) is 10~50μm.
7. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The mass ratio of amorphous calcium carbonate, acrylic acid, initiator, and solvent in step (2) is 10:0.1:0.01:15~30.
8. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The mass ratio of filler A, filler B, deionized water, isocyanate, polyol, catalyst, neutralizer and preservative in step (3) is 1:1:5~10:1.2:1:0.007:0.02:0.
01.
9. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The isocyanate in step (3) is at least one of diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
10. The method for preparing a super-strong adhesive water-based adhesive according to claim 1, characterized in that, The polyol mentioned in step (3) is at least one of polyethylene adipate and polyoxypropylene ether.