Anti-aging floor glue and preparation method thereof

Abstract

The invention provides an anti-aging floor adhesive and a preparation method thereof, and relates to the technical field of adhesives, the floor adhesive comprises the following raw materials: PVC resin powder, diisononyl phthalate, nano titanium dioxide, modified organic montmorillonite and the like. The preparation method of the floor glue comprises the following steps: mixing the nano titanium dioxide, the modified organic montmorillonite and the stearic acid; the preparation method comprises the following steps: premixing PVC resin powder, diisononyl phthalate and the like; adding the modified filler, antimony trioxide, magnesium hydroxide and light calcium carbonate into the premix, uniformly stirring, adding an ultraviolet light absorber and the like, and carrying out extrusion molding to obtain PVC colloidal particles; melting and extruding the PVC colloidal particles, coating the PVC colloidal particles on a base material, and rolling to obtain the floor glue. According to the invention, an efficient swelling system is constructed, nano titanium dioxide and quaternary ammonium salt modified OMMT are compounded, and synergistic anti-aging is realized through triple mechanisms, so that the defect that a single filler is short is overcome. Through multiple effects of all the components, the floor glue is endowed with the properties of ultraviolet resistance, high bonding strength and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to an anti-aging floor adhesive and a preparation method thereof. Background Art

[0002] Polyvinyl chloride (PVC) flooring adhesives are widely used in interior decoration, commercial flooring, and other fields due to their wear resistance, anti-slip properties, and easy construction. However, over long periods of service, PVC materials are susceptible to environmental factors such as ultraviolet radiation, oxygen, and temperature fluctuations, leading to aging reactions such as molecular chain breakage and oxidative crosslinking. These reactions can cause the material to become hard and brittle, discolor its surface, and deteriorate its mechanical properties, severely shortening its service life. Prior art techniques for improving the anti-aging properties of PVC flooring adhesives primarily rely on the addition of organic additives such as UV absorbers (such as UV-P) and antioxidants (such as 1076). However, the effectiveness of a single additive is limited, and high doses can cause compatibility issues, leading to a decrease in the material's mechanical properties.

[0003] In recent years, nanomaterials have become a research hotspot for improving the anti-aging properties of polymers due to their unique physicochemical properties, such as high specific surface area and UV shielding capabilities. For example, rutile nano-titanium dioxide effectively inhibits photooxidative cleavage of polymer chains by absorbing and scattering 280-400nm UV light. Organic montmorillonite (OMMT), a layered silicate, can form a nanoscale barrier structure after modification with quaternary ammonium salts, slowing oxygen diffusion and the progression of thermal oxidative aging. However, existing nanofillers suffer from insufficient dispersion in the PVC matrix and weak interfacial bonding with the polymer, limiting their full anti-aging properties.

[0004] The existing floor glue often has technical problems such as easy aging and poor adhesion. Summary of the Invention

[0005] The present invention provides an anti-aging floor adhesive and a preparation method thereof, so as to solve the technical problems of easy aging and poor adhesion of the floor adhesive in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: Disclosed is an anti-aging floor adhesive. Its raw materials include PVC resin powder, diisononyl phthalate, dioctyl adipate, epoxy soybean oil, antimony trioxide, magnesium hydroxide, ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew inhibitor, light calcium carbonate, organic pigment, nano titanium dioxide and modified organic montmorillonite. The nano titanium dioxide is rutile.

[0007] Preferably, the raw materials include, by mass, 45-55 parts of PVC resin powder, 25-35 parts of diisononyl phthalate, 2.5-4 parts of dioctyl adipate, 0.5-1.5 parts of epoxidized soybean oil, 2.8-4.5 parts of antimony trioxide, 4-8 parts of magnesium hydroxide, 0.05-0.25 parts of ultraviolet absorber, 0.05-0.8 parts of antioxidant, 0.5-1.8 parts of barium zinc liquid stabilizer, 0.05-0.3 parts of mildewproof agent, 2.5-6.5 parts of light calcium carbonate, 1-3 parts of organic pigment, 0.2-1.8 parts of nano titanium dioxide and 0.1-1 parts of modified organic montmorillonite.

[0008] Preferably, the particle size of the modified organic montmorillonite is 60-80 μm.

[0009] A method for preparing the anti-aging floor adhesive of the present invention comprises the following steps: S1, adding nano titanium dioxide, modified organic montmorillonite and stearic acid into a high-speed mixer, and stirring to obtain a modified filler; S2, premixing PVC resin powder, diisononyl phthalate, dioctyl adipate and epoxy soybean oil to obtain a premix; S3. Add the modified filler, antimony trioxide, magnesium hydroxide and light calcium carbonate to the premix, heat and stir (for example, heat to 100-110° C., stir at 500-600 rpm for 20-25 min); S4. Add the ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew inhibitor and organic pigment, and stir (for example, at 120-130°C for 10-15 minutes); S5. Extrusion molding through a single screw extruder (feeding section: 165°C, compression section: 175°C, metering section: 180°C, die head: 170°C) to obtain PVC pellets; S6. Preheating the high-anti-slip substrate (e.g., preheating at 120-140° C. for 30-40 minutes) to obtain a substrate; S7, melt-extruding and coating the PVC particles on the substrate to form a bottom adhesive layer; S8, winding up after cooling and shaping to obtain the floor glue.

[0010] Preferably, the amount of stearic acid added in S1 is 1.2-1.5% of the total mass of nano-titanium dioxide and modified organic montmorillonite.

[0011] Preferably, the preparation method of the modified organic montmorillonite described in S1 is as follows: nano-montmorillonite is added to deionized water at a solid-liquid ratio of 1g:15-20mL, and then octadecyltrimethylammonium chloride is added; the temperature is raised to 60-75°C, and stirred at 500-800r / min for 3-5 hours; after centrifugation and washing, the precipitate is dried at 90-100°C for 16-20h, and sieved to obtain the modified organic montmorillonite.

[0012] Preferably, the preparation method of the modified organic montmorillonite described in S1 is: (1) Add nano-montmorillonite to deionized water, then add octadecyltrimethylammonium chloride, and heat and stir; (2) After centrifugation and washing, the precipitate is dried and sieved to obtain pre-modified organic montmorillonite; (3) adding the pre-modified organic montmorillonite into water to obtain a pre-modified organic montmorillonite suspension; (4) Using Tris-HCl buffer as solvent and dopamine as solute to prepare a dopamine solution with a concentration of 5-6 mg / ml, the dopamine solution was added to the pre-modified organic montmorillonite suspension, and the mixture was stirred for 16-20 hours to obtain a modified organic montmorillonite suspension, which was then freeze-dried to obtain the modified organic montmorillonite.

[0013] Preferably, the added amount of octadecyltrimethylammonium chloride is 12%-15% of the mass of the nano-montmorillonite.

[0014] Preferably, the stirring in S1 is carried out at 40-50° C. and 900-1000 r / min for 18-30 min.

[0015] Preferably, the premixing in S2 is carried out by stirring at 200-300 r / min at 60-70° C. for 10-20 min.

[0016] The nano-titanium dioxide (rutile type) in this invention absorbs and scatters 280-400nm ultraviolet light, converting light energy into heat or low-energy radiation through electronic transitions. This directly reduces the impact of UV light on polymer molecular chains, inhibiting chain breakage and free radical generation, and suppressing photooxidative scission of polymer chains. Its high specific surface area and surface activity adsorb free radicals, synergizing with antioxidants to enhance resistance to thermal oxidative aging. The quaternary ammonium salt-modified organic montmorillonite (OMMT) forms a physical barrier through its layered structure, blocking oxygen diffusion and extending the UV light scattering path. When the interlayer spacing increases to >2.5nm, a nanoscale layered barrier is formed. When UV light is incident, the layered structure reflects some light and forces the remaining light to undergo multiple scattering between the layers, extending the light propagation path and reducing the energy density per unit area. The layered structure itself has a certain shielding effect on UV light. Combined with the absorption capacity of the nano-titanium dioxide, it forms a triple UV protection network of "absorption + scattering + shielding."

[0017] In addition, nano-titanium dioxide forms a synergistic scavenging mechanism with the antioxidants in the system (such as 1076). The antioxidants preferentially capture free radicals, and nano-titanium dioxide adsorbs residual free radicals, doubly inhibiting the oxidation reaction.

[0018] The modified organic montmorillonite simultaneously forms an "intercalation-entanglement" structure with the PVC matrix, enhancing interfacial bonding. The stearic acid coating process reduces the surface energy of the nanofiller, preventing agglomeration and enabling its uniform dispersion within the PVC matrix. This creates a stable "rigid particle-flexible matrix" composite structure, while also enhancing the filler's compatibility with plasticizers (such as DINP) and promoting interfacial adhesion. The combination of these two forms a synergistic "light absorption + oxygen barrier" network, which is more effective than single filler in delaying molecular chain breakage and oxidative crosslinking, reducing the formation of aging functional groups such as carbonyl and sulfoxide groups.

[0019] Quaternary ammonium salt modification renders the OMMT surface oleophilic. This, along with the stearic acid-coated nano-TiO2, allows for uniform dispersion within the polymer matrix through a hydrophobic-hydrophobic interaction, preventing interfacial defects caused by agglomeration. The uniform dispersion of the nanofiller forms a physically reinforced network, improving tensile strength and elongation at break retention. The OMMT layered structure interpenetrates and entangles with the PVC molecular chains, while the synergistic swelling of the plasticizer promotes interfacial compatibility and enhances the bond stability between the adhesive layer and the substrate (such as mesh).

[0020] After the overall adhesive layer cures, the nano-TiO2 acts as a rigid particle, limiting molecular chain slippage through a "pinning effect." The OMMT layered structure interpenetrates and entangles with the polymer molecular chains, forming a "rigid particle-layered reinforcement" composite network that collectively enhances tensile strength and elastic modulus. This composite system refines the polymer's crystal structure (for example, promoting uniform distribution of PVC crystallites), achieving a balanced balance of strength and toughness while avoiding the embrittlement associated with a single filler.

[0021] Improved filler dispersion uniformity reduces melt viscosity fluctuations, stabilizes melt pressure during extrusion, and reduces the risk of high-temperature degradation. Quaternary ammonium salt-modified OMMT works synergistically with plasticizers (such as DINP) to promote polymer swelling and filler wettability, enhancing blending efficiency and final product uniformity.

[0022] Organic montmorillonite modified with dopamine and octadecyltrimethylammonium chloride can enhance the anti-aging properties of floor adhesives. Dopamine undergoes auto-oxidative polymerization in Tris-HCl buffer (pH 8-9.5), forming a dense PDA film on the montmorillonite surface. The PDA film interacts with silanol groups on the montmorillonite surface and the alkyl chains of OTAC through hydrogen bonding and π-π stacking. It also covalently crosslinks with amino groups (if protonated) of OTAC via Schiff base reactions and Michael additions, enhancing coating stability. The PDA film is rich in functional groups such as phenolic hydroxyl groups, amino groups, and indole rings, providing chemically active sites for anti-aging properties. The hydrophobic layer formed by the OTAC intercalation serves as the "core," while the PDA film serves as the "shell," creating a composite structure of interlayer organic intercalation and surface functional coating. This structure retains the layered barrier properties of the montmorillonite while imparting antioxidant properties through the active groups of the PDA.

[0023] The technical solution of the present invention has at least the following beneficial effects compared with the prior art: Using a suspended PVC resin powder as the matrix, its loose, porous structure forms a highly effective swelling system with plasticizers such as diisononyl phthalate (DINP) and dioctyl adipate (DOA), imparting flexibility and processability to the flooring adhesive. Epoxidized soybean oil (EPO) acts as both a plasticizer and stabilizer, capturing HCl produced by PVC degradation and slowing thermal aging. This combination improves the matrix's elongation at break while providing a uniform continuous phase for the dispersion of nanofillers, enhancing interfacial compatibility.

[0024] The composite system of nano-titanium dioxide and quaternary ammonium salt-modified OMMT in the present invention synergistically acts through the triple mechanism of ultraviolet light physical shielding + thermal oxidation chemical barrier + interface structure reinforcement, thereby making up for the functional shortcomings of a single filler, forming a comprehensive anti-aging protection network, and ultimately significantly improving the weather resistance and service life of the substrate.

[0025] UV absorber UV-P, antioxidant 1076, and nanofillers form a synergistic "light absorption and free radical scavenging" mechanism, further reducing the formation of aging functional groups. Barium zinc liquid stabilizer (BZ) inhibits thermal degradation of PVC during processing, minimizing melt viscosity fluctuations. These components, through the multifaceted effects of "physical barrier + chemical protection + interface reinforcement," impart UV resistance, thermal oxygen resistance, flame retardancy, mildew resistance, and high bond strength to the flooring adhesive, meeting the stringent durability and functionality requirements of commercial and medical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a physical picture of the floor glue prepared in Example 1. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions of the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described 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.

[0028] The suppliers of raw materials used in the specific implementation are as follows: PVC resin powder, Shandong Langhui Petrochemical Co., Ltd.; Diisononyl phthalate, Zhuhai Liancheng Chemical Industry Co., Ltd.; Dioctyl adipate, Zhongshan Liancheng Chemical Industry Co., Ltd.; Ultraviolet absorber UV-P, Guangdong Huatai New Materials Co., Ltd.; Epoxidized soybean oil, Foshan Gaoming Shengjun Plastic Additive Co., Ltd.; The barium zinc liquid stabilizer is BZ100, produced by FRONTOY ENTERPRISE CO., LTD. The mildew inhibitor is PT410 produced by Foshan Liyuan Chemical; Antioxidant 1076, Guangzhou Baixin Pigment Chemical Co., Ltd.; Light calcium carbonate, Guangdong Huixiong Industrial Investment Co., Ltd.; Antimony trioxide, Xikuangshan Shanxing Antimony Industry Co., Ltd.; Magnesium hydroxide, magnesium hydroxide Guangdong Jinge New Materials Co., Ltd.; Organic pigment, Pigment Yellow 110 produced by Sennico Chemical (Guangzhou) Co., Ltd., CAS: 5590-18-1.

[0029] Example 1 This embodiment provides an anti-aging floor adhesive, the raw materials of which include, by mass, 48.1 parts of PVC resin powder, 27.7 parts of diisononyl phthalate, 3.1 parts of dioctyl adipate, 1.0 parts of epoxidized soybean oil, 3.5 parts of antimony trioxide, 5.1 parts of magnesium hydroxide, 0.13 parts of ultraviolet absorber, 0.11 parts of antioxidant 1076, 1.28 parts of barium zinc liquid stabilizer, 0.11 parts of mildew inhibitor, 4.1 parts of light calcium carbonate, 1.7 parts of organic pigment, 0.5 parts of nano-titanium dioxide, and 0.3 parts of modified organic montmorillonite. The modified organic montmorillonite is a quaternary ammonium salt-modified organic montmorillonite with an interlayer spacing of 3 nm and a particle size of 60 μm.

[0030] A method for preparing the anti-aging floor adhesive of the present invention comprises the following steps: S1. Adding nano-montmorillonite to deionized water at a solid-liquid ratio of 1 g:15 mL, and then adding octadecyltrimethylammonium chloride in an amount of 12% of the mass of the nano-montmorillonite; heating to 60° C. and stirring at 500 r / min for 5 hours; after centrifugation and washing with deionized water, drying the precipitate at 90° C. for 16 hours, and sieving to obtain the modified organic montmorillonite; S2. Add nano-titanium dioxide, modified organic montmorillonite and stearic acid into a high-speed mixer, stir at 900 r / min at 40° C. for 18 min, wherein the amount of stearic acid added is 1.2% of the total mass of the nano-titanium dioxide and modified organic montmorillonite, and stir evenly to obtain a modified filler; S3, premixing PVC resin powder, diisononyl phthalate, dioctyl adipate and epoxy soybean oil, and stirring at 200 rpm for 20 min at 60° C. to obtain a premix; S4, adding the modified filler, antimony trioxide, magnesium hydroxide and light calcium carbonate to the premix, heating to 100° C., and stirring at 500 r / min for 25 min; S5. Add ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew inhibitor and organic pigment, and stir at 120°C for 15 minutes; S6. Extrusion molding through a single-screw extruder (feeding section: 165°C, compression section: 175°C, metering section: 180°C, die head: 170°C) to obtain PVC pellets; S7, preheating the high-slip characteristic forest at 120° C. for 40 minutes to obtain a substrate; S8, melt-extruding and coating the PVC particles on the substrate to form a bottom adhesive layer; S9, after cooling and shaping, coiling to obtain the floor glue. Figure 1 .

[0031] Example 2 This embodiment provides an anti-aging floor adhesive, the raw materials of which include, by mass, 50.5 parts of PVC resin powder, 30.5 parts of diisononyl phthalate, 3.7 parts of dioctyl adipate, 1.1 parts of epoxidized soybean oil, 4.1 parts of antimony trioxide, 7.2 parts of magnesium hydroxide, 0.16 parts of ultraviolet absorber, 0.52 parts of antioxidant 1076, 1.35 parts of barium zinc liquid stabilizer, 0.19 parts of mildew inhibitor, 5.5 parts of light calcium carbonate, 2.2 parts of organic pigment, 1.0 part of nano-titanium dioxide, and 0.6 parts of modified organic montmorillonite. The modified organic montmorillonite is a quaternary ammonium salt-modified organic montmorillonite with an interlayer spacing of 3 nm and a particle size of 80 μm.

[0032] A method for preparing the anti-aging floor adhesive of the present invention comprises the following steps: S1. Add nano-montmorillonite to deionized water at a solid-liquid ratio of 1 g:20 mL, and then add octadecyltrimethylammonium chloride in an amount of 15% of the mass of the nano-montmorillonite; heat to 75° C. and stir at 800 rpm for 3 hours; after centrifugation and washing, dry the precipitate at 100° C. for 16 hours, and sieve to obtain the modified organic montmorillonite; S2. Add nano-titanium dioxide, modified organic montmorillonite and stearic acid into a high-speed mixer, stir at 1000 r / min at 50° C. for 30 min, wherein the amount of stearic acid added is 1.5% of the total mass of the nano-titanium dioxide and modified organic montmorillonite, and stir evenly to obtain a modified filler; S3, premixing PVC resin powder, diisononyl phthalate, dioctyl adipate and epoxy soybean oil, and stirring at 70° C. and 300 r / min for 10 min to obtain a premix; S4, adding the modified filler, antimony trioxide, magnesium hydroxide and light calcium carbonate to the premix, heating to 110° C., and stirring at 600 r / min for 25 min; S5. Add ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew inhibitor and organic pigment, and stir at 130°C for 15 minutes; S6. Extrusion molding through a single-screw extruder (feeding section: 165°C, compression section: 175°C, metering section: 180°C, die head: 170°C) to obtain PVC pellets; S7, preheating the high anti-slip characteristic forest at 140° C. for 30 min to obtain a substrate; S8, melt-extruding and coating the PVC particles on the substrate to form a bottom adhesive layer; S9, winding up after cooling and shaping to obtain the floor glue.

[0033] Example 3 This embodiment provides an anti-aging floor adhesive, the raw materials of which include, by mass, 49 parts of PVC resin powder, 29 parts of diisononyl phthalate, 3.5 parts of dioctyl adipate, 1.05 parts of epoxidized soybean oil, 3.8 parts of antimony trioxide, 6 parts of magnesium hydroxide, 0.15 parts of ultraviolet absorber, 0.4 parts of antioxidant 1076, 1.3 parts of barium zinc liquid stabilizer, 0.18 parts of mildew inhibitor, 5 parts of light calcium carbonate, 2 parts of organic pigment, 0.8 parts of nano-titanium dioxide, and 0.5 parts of modified organic montmorillonite. The modified organic montmorillonite is a quaternary ammonium salt-modified organic montmorillonite, the interlayer spacing of the quaternary ammonium salt-modified organic montmorillonite is 3 nm, and the particle size of the modified organic montmorillonite is 70 μm.

[0034] A method for preparing the anti-aging floor adhesive of the present invention comprises the following steps: S1. Adding nano-montmorillonite to deionized water at a solid-liquid ratio of 1 g:18 mL, and then adding octadecyltrimethylammonium chloride in an amount of 14% of the mass of the nano-montmorillonite; heating to 70° C. and stirring at 700 rpm for 4 hours; after centrifugation and washing, drying the precipitate at 95° C. for 18 hours, and sieving to obtain the modified organic montmorillonite; S2. Add nano-titanium dioxide, modified organic montmorillonite and stearic acid into a high-speed mixer, stir at 950 r / min for 25 min at 45° C., wherein the amount of stearic acid added is 1.3% of the total mass of the nano-titanium dioxide and modified organic montmorillonite, and stir evenly to obtain a modified filler; S3, premixing PVC resin powder, diisononyl phthalate, dioctyl adipate and epoxy soybean oil, and stirring at 250 r / min at 65° C. for 15 min to obtain a premix; S4, adding the modified filler, antimony trioxide, magnesium hydroxide and light calcium carbonate to the premix, heating to 105° C., and stirring at 550 r / min for 23 min; S5. Add ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew inhibitor and organic pigment, and stir at 125°C for 13 minutes; S6. Extrusion molding through a single-screw extruder (feeding section: 165°C, compression section: 175°C, metering section: 180°C, die head: 170°C) to obtain PVC pellets; S7, preheating the high anti-slip characteristic forest at 130° C. for 35 min to obtain a substrate; S8, melt-extruding and coating the PVC particles on the substrate to form a bottom adhesive layer; S9, winding up after cooling and shaping to obtain the floor glue.

[0035] Example 4 This embodiment is the same as embodiment 1, except that the preparation method of the modified organic montmorillonite in this embodiment is as follows: (1) Add nano-montmorillonite to deionized water at a solid-liquid ratio of 1 g:15 mL, and then add octadecyltrimethylammonium chloride, where the amount of octadecyltrimethylammonium chloride is 12% of the mass of the nano-montmorillonite; heat to 60 °C and stir at 500 r / min for 5 hours; after centrifugation and washing with deionized water, dry the precipitate at 90 °C for 16 hours and sieve to obtain pre-modified organic montmorillonite; (2) adding the pre-modified organic montmorillonite into water at a solid-liquid ratio of 1 g:20 mL to obtain a pre-modified organic montmorillonite suspension; (3) Using Tris-HCl buffer (50 mM) as solvent and dopamine as solute, a dopamine solution with a concentration of 5 mg / ml was prepared. The dopamine solution was added to the pre-modified organic montmorillonite suspension at a mass ratio of 1:1. The two solutions were stirred for 16 h to obtain a modified organic montmorillonite suspension, which was then freeze-dried (vacuum freeze-dried for 30 h) to obtain the modified organic montmorillonite.

[0036] Example 5 This embodiment is the same as embodiment 1, except that the preparation method of the modified organic montmorillonite in this embodiment is as follows: (1) Add nano-montmorillonite to deionized water at a solid-liquid ratio of 1 g:15 mL, and then add octadecyltrimethylammonium chloride, where the amount of octadecyltrimethylammonium chloride is 12% of the mass of the nano-montmorillonite; heat to 60 °C and stir at 500 r / min for 5 hours; after centrifugation and washing with deionized water, dry the precipitate at 90 °C for 16 hours and sieve to obtain pre-modified organic montmorillonite; (2) adding the pre-modified organic montmorillonite into water at a solid-liquid ratio of 1 g:20 mL to obtain a pre-modified organic montmorillonite suspension; (3) Using Tris-HCl buffer (50 mM) as solvent and dopamine as solute, a dopamine solution with a concentration of 6 mg / ml was prepared. The dopamine solution was added to the pre-modified organic montmorillonite suspension at a mass ratio of 1:1. The two solutions were stirred for 20 h to obtain a modified organic montmorillonite suspension, which was then freeze-dried (vacuum freeze-dried for 30 h) to obtain the modified organic montmorillonite.

[0037] Example 6 This embodiment is the same as embodiment 1, except that the preparation method of the modified organic montmorillonite in this embodiment is as follows: (1) Add nano-montmorillonite to deionized water at a solid-liquid ratio of 1 g:15 mL, and then add octadecyltrimethylammonium chloride, where the amount of octadecyltrimethylammonium chloride is 12% of the mass of the nano-montmorillonite; heat to 60 °C and stir at 500 r / min for 5 hours; after centrifugation and washing with deionized water, dry the precipitate at 90 °C for 16 hours and sieve to obtain pre-modified organic montmorillonite; (2) adding the pre-modified organic montmorillonite into water at a solid-liquid ratio of 1 g:20 mL to obtain a pre-modified organic montmorillonite suspension; (3) Using Tris-HCl buffer (50 mM) as solvent and dopamine as solute, a dopamine solution with a concentration of 5.5 mg / ml was prepared. The dopamine solution was added to the pre-modified organic montmorillonite suspension at a mass ratio of 1:1. The two solutions were stirred for 18 h to obtain a modified organic montmorillonite suspension, which was then freeze-dried (vacuum freeze-dried for 30 h) to obtain the modified organic montmorillonite.

[0038] Comparative Example 1 This comparative example is the same as Example 1, except that in this comparative example, an equal amount of nano-titanium dioxide is replaced by silicon dioxide.

[0039] Comparative Example 2 This comparative example is the same as Example 1, except that in this comparative example, an equal amount of nano-titanium dioxide is replaced by nano-zinc oxide.

[0040] Comparative Example 3 This comparative example is the same as Example 1, except that the amount of modified organic montmorillonite added in this comparative example is replaced by 1 part.

[0041] Comparative Example 4 This comparative example is the same as Example 1, except that in this comparative example, an equal amount of modified organic montmorillonite is replaced by nano-montmorillonite.

[0042] The floor adhesives in Examples 1-6 and Comparative Examples 1-4 were tested for anti-slip value. The thickness of the floor adhesives in Examples 1-6 and Comparative Examples 1-4 was 1.7 mm. The testing method was in accordance with GB 36246-2018. The measurement results are shown in Table 1 below.

[0043] Table 1 Anti-slip values ​​of each group of floor adhesives Group Anti-slip value 1 Anti-slip value 2 Anti-slip value 3 average value Example 1 95.1 96.0 95.0 95.37 Example 2 96.3 95.4 96.3 96.00 Example 3 96.3 95.6 95.8 95.90 Example 4 97.4 97 97.4 97.27 Example 5 98.1 98.3 97.7 98.03 Example 6 97.4 97.3 97.5 97.40 Comparative Example 1 95.4 95.6 95.3 95.43 Comparative Example 2 92.7 92.1 92.9 92.57 Comparative Example 3 95.3 96.1 95.2 95.53 Comparative Example 4 93.8 94.2 94.3 94.10 The flooring adhesives in Examples 1-6 and Comparative Examples 1-4 were subjected to a light aging test - UV radiation exposure, test method: ASTM G154-23 Cycle 1, reference ISO 105 - A02:1993 / Cor.2:2005, test conditions: Lamp type: UVA-340 Illumination: 8h, (60±3)℃ BPT, 0.89W / (m²·nm)@340nm Condensation: 4h, (50±3)℃ BPT Exposure time: 100h.

[0044] The test results are shown in Table 2.

[0045] Table 2 Test results of light aging test of floor glue Group Gray scale level 1 Gray scale level 2 Gray scale level 3 Example 1 5 5 5 Example 2 4-5 5 5 Example 3 5 5 5 Example 4 5 5 5 Example 5 5 5 5 Example 6 5 5 5 Comparative Example 1 4 5 4 Comparative Example 2 4 3-4 4 Comparative Example 3 4 5 4 Comparative Example 4 3-4 4 4 The peeling loads of the floor adhesives in Examples 1-6 and Comparative Examples 1-4 were measured using DIN 53353 as a reference standard. The measurement results are shown in Table 3.

[0046] Table 3 Peeling load of each group of floor adhesives Group Peel load 1 (N / 5cm) Peel load 2 (N / 5cm) Peel load 3 (N / 5cm) Average value (N / 5cm) Example 1 88.5 88.9 89.2 88.87 Example 2 89.2 86.6 88.5 88.10 Example 3 87.5 89.7 87 88.07 Example 4 90 89.3 90.2 89.83 Example 5 89.4 90.4 89.2 89.67 Example 6 90.2 91 90.5 90.57 Comparative Example 1 83 84 83.7 83.57 Comparative Example 2 82.2 82.2 82 82.13 Comparative Example 3 79.9 80.2 79 79.70 Comparative Example 4 80.4 79.8 80 80.07 The above data demonstrates that the floor adhesive of the present invention exhibits excellent anti-aging properties, strong adhesion, and excellent anti-slip properties. Comparing the experimental data of the floor adhesives of Example 1 with those of Comparative Examples 1 and 2 reveals that replacing titanium dioxide with silicon dioxide or zinc oxide reduces the anti-aging properties of the floor adhesive. This is evident from the differences in UV absorption and antioxidant properties.

[0047] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An anti-aging floor adhesive, characterized in that: The raw materials include PVC resin powder, diisononyl phthalate, dioctyl adipate, epoxy soybean oil, antimony trioxide, magnesium hydroxide, ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew preventer, light calcium carbonate, organic pigment, nano titanium dioxide and modified organic montmorillonite, wherein the nano titanium dioxide is rutile type.

2. The anti-aging floor adhesive according to claim 1, characterized in that: The raw materials include, by mass, 45-55 parts of PVC resin powder, 25-35 parts of diisononyl phthalate, 2.5-4 parts of dioctyl adipate, 0.5-1.5 parts of epoxy soybean oil, 2.8-4.5 parts of antimony trioxide, 4-8 parts of magnesium hydroxide, 0.05-0.25 parts of ultraviolet absorber, 0.05-0.8 parts of antioxidant, 0.5-1.8 parts of barium zinc liquid stabilizer, 0.05-0.3 parts of mildewproof agent, 2.5-6.5 parts of light calcium carbonate, 1-3 parts of organic pigment, 0.2-1.8 parts of nano titanium dioxide and 0.1-1 parts of modified organic montmorillonite.

3. The anti-aging floor adhesive according to claim 1, characterized in that: The particle size of the modified organic montmorillonite is 60-80 μm.

4. A method for preparing the anti-aging floor adhesive according to any one of claims 1 to 3, characterized in that: The following steps are included: S1, adding nano titanium dioxide, modified organic montmorillonite and stearic acid into a blender, and stirring to obtain a modified filler; S2, premixing PVC resin powder, diisononyl phthalate, dioctyl adipate and epoxy soybean oil to obtain a premix; S3, adding modified filler, antimony trioxide, magnesium hydroxide and light calcium carbonate to the premix, heating and stirring; S4, then add ultraviolet absorber, antioxidant, barium zinc liquid stabilizer, mildew inhibitor and organic pigment, and stir for n; S5, extruding through a single-screw extruder to obtain PVC pellets; S6. Preheating the high-anti-slip substrate to obtain a substrate; S7, melt-extruding and coating the PVC particles on the substrate to form a bottom adhesive layer; S8, winding up after cooling and shaping to obtain the floor glue.

5. The method for preparing the anti-aging floor adhesive according to claim 4, characterized in that: The amount of stearic acid added in S1 is 1.2-1.5% of the total mass of nano-titanium dioxide and modified organic montmorillonite.

6. The method for preparing the anti-aging floor adhesive according to claim 4, characterized in that: Preparation method of modified organic montmorillonite described in S1: adding nano-montmorillonite to deionized water at a solid-liquid ratio of 1g:15-20mL, and then adding octadecyltrimethylammonium chloride; heating and stirring; After centrifugation and washing, the precipitate is dried and sieved to obtain the modified organic montmorillonite.

7. The method for preparing the anti-aging floor adhesive according to claim 4, characterized in that: Preparation method of modified organic montmorillonite described in S1: Add nano-montmorillonite into deionized water, then add octadecyltrimethylammonium chloride, and heat and stir; After centrifugation and washing, the precipitate is dried and sieved to obtain pre-modified organic montmorillonite; adding the pre-modified organic montmorillonite into water to obtain a pre-modified organic montmorillonite suspension; A dopamine solution with a concentration of 5-6 mg / ml is prepared using Tris-HCl buffer as a solvent and dopamine as a solute. The dopamine solution is added to a pre-modified organic montmorillonite suspension, and the mixture is stirred for reaction for 16-20 hours to obtain a modified organic montmorillonite suspension. The modified organic montmorillonite is obtained by freeze-drying.

8. The method for preparing the anti-aging floor adhesive according to claim 6, characterized in that: The added amount of the octadecyltrimethylammonium chloride is 12%-15% of the mass of the nano-montmorillonite.

9. The method for preparing the anti-aging floor adhesive according to claim 4, characterized in that: The stirring in S1 is stirring at 900-1000 r / min at 40-50° C. for 18-30 min.

10. The method for preparing the anti-aging floor adhesive according to claim 5, characterized in that: The premixing in S2 is carried out by stirring at 200-300 r / min at 60-70° C. for 10-20 min.

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