Sound insulation adhesive for ceramic tiles and preparation method thereof

Abstract

The invention discloses a sound insulation adhesive for ceramic tiles and a preparation method of the sound insulation adhesive, and relates to the technical field of adhesives. The cement-based composite material comprises the following raw materials: cement, mineral aggregate, sodium sulfate, deionized water, pretreated tire powder, diatomite, modified silica fume, mineral aggregate, a latex solution, microcapsule particles and nano calcium carbonate. The waste tire powder is treated by a sodium hydroxide aqueous solution and then modified by a silane coupling agent KH570, the modified silica fume is prepared by combining silica fume pretreated by sodium hydroxide and graphene oxide reduced by ascorbic acid under the action of a silane coupling agent KH550, and butyl stearate is used as a core material. The introduction of microcapsule particles taking polyurea formed by reaction of isophorone diisocyanate and hexamethylenediamine as a wall material effectively improves the sound insulation capability, water resistance, heat aging resistance and flexibility of the sound insulation adhesive for ceramic tiles. Therefore, the method has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, specifically to a sound-insulating adhesive for ceramic tiles and its preparation method. Background Technology

[0002] In everyday construction, tiles are typically bonded using cement or tile adhesive. Cement is a traditional and widely used material that, after drying, bonds tiles to the surface through mechanical interlocking force. Its advantages include low cost, readily available raw materials, and simple preparation; however, its disadvantages are also obvious: difficulty in controlling the thickness of the tile and a tendency to create hollow spots. Therefore, tile adhesive was developed. Tile adhesive is a modern decorative material used for bonding ceramic tiles, wall tiles, floor tiles, and other decorative materials. It works by allowing the slurry to penetrate the capillaries on the back of the tile, creating adhesion. This bonding method prevents hollow spots and detachment between the tile and the surface. Furthermore, by adding sound-insulating materials to the tile adhesive, it can also achieve sound insulation, combining tile installation and soundproofing functions into one product. Sound-insulating tile adhesive is suitable for bonding tiles to floors and walls.

[0003] However, in practical applications, sound-insulating tile adhesive still exhibits relatively poor sound insulation capabilities against low-frequency noise. Furthermore, it suffers from insufficient heat aging resistance and is prone to absorbing water and swelling in humid environments, leading to reduced bonding strength. Therefore, the sound insulation, heat aging resistance, and waterproofing capabilities of existing sound-insulating tile adhesives still require further improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a sound-insulating adhesive for ceramic tiles and its preparation method, thereby solving the following technical problems: Existing soundproof tile adhesives still have problems with poor sound insulation, heat aging resistance, and waterproofing.

[0005] The objective of this invention can be achieved through the following technical solutions: A sound-insulating adhesive for ceramic tiles comprises the following raw materials in parts by weight: 60-90 parts cement, 80-90 parts mineral aggregate, 1.4-2.4 parts sodium sulfate, 15-20 parts deionized water, 20-40 parts pretreated tire powder, 10-12 parts diatomaceous earth, 5-7 parts modified silica fume, 6-16 parts mineral aggregate, 110-130 parts latex solution, 8-10 parts microcapsule particles, and 0.5-1 parts nano-calcium carbonate; The pretreated tire powder is waste tire powder that has been treated with sodium hydroxide aqueous solution and then modified with silane coupling agent KH570. The modified silica fume is prepared by combining silica fume pretreated with sodium hydroxide with graphene oxide reduced by ascorbic acid under the action of silane coupling agent KH550. The microcapsule particles are microcapsules with butyl stearate as the core material and polyurea, formed by the reaction of isophorone diisocyanate and hexamethylenediamine, as the wall material.

[0006] Preferably, the mineral aggregate is any one or more of quartz sand, river sand, and basalt sand; The particle size of the mineral aggregate is 0.1-2 mm; The mineral aggregate is quartz powder and talc powder in a mass ratio of 2-3:1.

[0007] Preferably, the method for preparing the pretreated tire powder is as follows: A1: Add silane coupling agent KH570 to deionized water and stir well. Then adjust the pH to 4-5 with glacial acetic acid and stir for 10-20 minutes to obtain the coupling agent solution. A2: Add waste tire powder to an aqueous sodium hydroxide solution and sonicate at 55-60℃ for 2-3 hours. After filtration, wash with deionized water until the pH is 7-7.5. Then add it to a coupling agent solution and stir for 30-40 minutes. Finally, filter and dry to obtain pretreated tire powder.

[0008] Preferably, the mass ratio of deionized water to silane coupling agent KH570 in A1 is 200-250:2-5; The mass ratio of the sodium hydroxide aqueous solution, waste tire powder, and coupling agent solution in A2 is 300-350:100-120:200-255; The sodium hydroxide aqueous solution described in A2 has a mass fraction of 6%-8%.

[0009] Preferably, the modified silica fume is prepared as follows: B1: Add silica fume to an aqueous sodium hydroxide solution and stir at 75-80℃ for 1-2 hours. Then centrifuge and wash with deionized water until the pH is 7-7.5. After drying, the pretreated silica fume is obtained. B2: Add graphene oxide to deionized water and ultrasonically exfoliate for 1-2 hours. Then add pretreated silica fume and silane coupling agent KH550 and stir at 75-80℃ for 4-5 hours. Then add ascorbic acid and stir for 10-20 minutes. Filter and freeze dry at -50℃ for 20-30 hours. Then add polyvinylpyrrolidone and ball mill until D50 is 3-4 μm to obtain modified silica fume.

[0010] Preferably, the mass ratio of the sodium hydroxide aqueous solution to silica fume in B1 is 200-300:110-130; The sodium hydroxide aqueous solution described in B1 has a mass fraction of 2%; The mass ratio of deionized water, graphene oxide, pretreated silica fume, silane coupling agent KH550, ascorbic acid, and polyvinylpyrrolidone in B2 is 200-220:1-1.2:100-110:0.5-1:1-1.5:0.1-0.2.

[0011] Preferably, the microcapsule particles are prepared as follows: Add Tween 80 and Span 80 to deionized water and stir at 3500-4000 rpm for 10-15 min. Then add butyl stearate, isophorone diisocyanate, and nano-silica and stir at 3500-4000 rpm for 10-15 min. Next, add hexamethylenediamine aqueous solution at 3-5℃ and stir for 30-40 min. Adjust the pH to 8-8.5 with ammonia water. Stir at 63-65℃ for 2-2.5 h and filter. Wash 3-5 times with 40%-50% ethanol aqueous solution. Vacuum dry at 35-40℃ for 20-30 h and pass through a 200-400 mesh sieve to obtain microcapsule particles.

[0012] Preferably, the mass ratio of the deionized water, Tween 80, Span 80, butyl stearate, isophorone diisocyanate, nano silica, and hexamethylenediamine aqueous solution is 150-180: 2.7-3.2: 0.9-1.1: 60-72: 15-18: 0.3-0.5: 20-24; The mass fraction of the hexamethylenediamine aqueous solution is 8%-10%.

[0013] Preferably, the latex solution is prepared as follows: Add hydroxypropyl methylcellulose to deionized water and stir at 75-80℃. After cooling to 35-40℃, add ethylene-vinyl acetate copolymer and defoamer BYK-024 and stir for 20-30 min. Then defoam under vacuum at -0.08MPa for 15-20 min to obtain latex solution. The mass ratio of the deionized water, hydroxypropyl methylcellulose, ethylene-vinyl acetate copolymer, and defoamer BYK-024 is 100-113:0.8-1.2:10-16:0.1-0.3.

[0014] A method for preparing a sound-insulating adhesive for ceramic tiles includes the following steps; Add mineral aggregates, sodium sulfate, and deionized water to cement and stir at 180-200 r / min for 3-5 min. Then add pretreated tire powder, diatomaceous earth, modified silica fume, and mineral aggregates and stir at 260-300 r / min for 4-5 min. Next, add latex solution 1 and stir at 120-150 r / min for 3-5 min. Finally, add microcapsule particles and latex solution 2 and stir at 60-70 r / min for 2-3 min. After adding nano calcium carbonate, seal and let stand for 40-60 min to obtain a sound-insulating adhesive for ceramic tiles. Both latex solution 1 and latex solution 2 are latex solutions; The mass ratio of latex solution 1 to latex solution 2 is 80-90:30-40.

[0015] The beneficial effects of this invention are: This invention provides a sound-insulating adhesive for ceramic tiles and its preparation method. The invention effectively improves the sound insulation ability, heat aging resistance, and waterproof ability of the sound-insulating adhesive for ceramic tiles through the following method.

[0016] (1) The waste tire powder pretreated in this invention contains a large number of micropores and cavities, which can reduce the sound transmission efficiency through sound wave reflection, scattering and vibration energy absorption. After pretreatment, the tire powder is more evenly dispersed and forms a composite structure with cement and latex matrix, further enhancing the dissipation capacity of sound waves of different frequencies and effectively improving sound insulation performance. After pretreatment, the waste tire powder is more tightly bonded to the matrix, which can reduce interfacial peeling at high temperatures. Pretreatment enhances the surface polarity of the tire powder, which can reduce the penetration of water at the interface. The introduced siloxane groups can reduce the hydrophilicity of the tire powder-matrix interface and reduce the damage of water to the bonding interface. The rubber elasticity of the tire powder can alleviate the internal stress caused by temperature changes and substrate shrinkage. After pretreatment, the stress can be more evenly dispersed, reducing the risk of brittle fracture and significantly enhancing flexibility.

[0017] (2) The reduced graphene oxide in the modified silica fume of this invention has a sheet-like barrier structure, which can effectively reflect and absorb sound waves; the ultrafine silica fume particles can fill the internal pores of the adhesive, reduce the air transmission channels, and form a synergistic barrier network with the graphene sheets, enhancing the attenuation effect of sound waves and improving the overall sound insulation performance. After pretreatment, the surface hydroxyl groups of silica fume increase, which can react with cement hydration products to generate more hydrated calcium silicate gel, enhancing the strength of the inorganic phase; the high mechanical properties of graphene can strengthen the matrix, and the silane coupling agent improves the interfacial bonding between the modified silica fume and the organic and inorganic phases, reducing interfacial defects and synergistically improving the tensile bond strength. Graphene can uniformly disperse heat and reduce local overheating; silica fume can make the adhesive structure more compact and reduce the rate of water evaporation and component decomposition at high temperatures; the chemical stability of reduced graphene oxide and the interfacial bonding strengthened by the coupling agent can resist the structural degradation caused by high temperature and improve the heat aging resistance. Graphene sheets reduce water penetration pathways; the gel generated from the reaction of silica fume fills the pores, effectively reducing the material's water absorption rate; the coupling agent KH550 reduces interfacial hydrophilicity, minimizing water damage to the organic-inorganic interface and improving water resistance. Graphene sheets form an elastic network in adhesives, alleviating stress concentration; the uniform dispersion of ultrafine silica fume reduces the adverse effects of rigid particles on flexibility, and the coupling agent promotes synergistic effects with the latex, making the material more prone to plastic deformation under stress and enhancing flexibility.

[0018] (3) The core-shell structure of the microcapsule particles of this invention causes multiple reflections and scatterings of sound waves at the interface between the microcapsule and the matrix during propagation; at the same time, the viscous damping effect of the core material can absorb sound wave energy and reduce sound wave transmission efficiency; in addition, the microcapsules fill the pores of the matrix, reduce the air transmission channels, and significantly improve the sound insulation ability. The core material can be slowly released at high temperatures, and the plastic flow can relieve the internal stress of the matrix caused by thermal expansion and contraction; the polyurea and nano-silica in the wall material can resist the damage of the wall material by high temperature, delay the excessive loss of the core material, and reduce the embrittlement of the matrix caused by high temperature. The microcapsule wall material is hydrophobic, and its filling of the capillary pores in the matrix can reduce the water penetration channels and reduce the softening of the matrix caused by water absorption. The microcapsule particles increase the internal friction resistance of the system, increase the apparent viscosity of the adhesive, and reduce the tendency of the tiles to slip after installation; the mechanical interlocking effect between the particles and the matrix can enhance the cohesion. When subjected to stress, the core material of the microcapsule can absorb energy through plastic deformation. Combined with the elasticity of the wall material, this can alleviate stress concentration, making the adhesive more prone to deformation without becoming brittle, and improving its flexibility.

[0019] (4) The diatomaceous earth of this invention has a unique porous structure that can adsorb and scatter sound waves, while also enhancing the porosity of the adhesive and improving the absorption efficiency of sound waves. Diatomaceous earth particles can fill the voids inside the system and enhance the interfacial adhesion; its siliceous structure can form a synergistic effect with the inorganic components in the system, improving the overall density and thus increasing the tensile bond strength. Diatomaceous earth can reduce the risk of thermal shrinkage or degradation of the system at high temperatures and enhance the material's resistance to temperature changes. Diatomaceous earth particles can increase the internal friction and consistency of the system, improve the thixotropy of the adhesive before curing, and reduce the tendency to slide during tile laying; after curing, its porous structure and the mechanical interlocking effect with the matrix will also enhance the overall stability and improve the anti-slip ability.

[0020] Therefore, the sound-insulating adhesive for ceramic tiles prepared by this invention has excellent sound insulation ability, tensile bond strength, heat aging resistance, waterproof ability, flexibility, and a wider range of application prospects. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0022] Unless otherwise specified, the following information pertains to some of the raw materials used in the following embodiments and comparative examples of this invention: Waste tire powder was screened using a 20-mesh sieve before use; polyvinylpyrrolidone was purchased from Shanghai Yuanye Biotechnology Co., Ltd., item number: S30268; cement was screened using a 40-mesh sieve before use.

[0023] Example 1: A method for preparing a sound-insulating adhesive for ceramic tiles is as follows: S1: Add 2g of silane coupling agent KH570 to 200g of deionized water and stir for 20min. Then adjust the pH to 4 with glacial acetic acid and stir for 10min to obtain the coupling agent solution. S2: Add 100g of waste tire powder to 300g of sodium hydroxide aqueous solution with a mass fraction of 6% and sonicate at 55℃ for 2h. After filtration, wash with deionized water until pH is 7. Then add to 200g of coupling agent solution and stir for 30min. Finally filter and dry at 100℃ to obtain pretreated tire powder. S3: Add 110g of silica fume to 200g of sodium hydroxide aqueous solution with a mass fraction of 2% and stir at 75℃ for 1h. Then centrifuge and wash with deionized water until pH is 7. After drying, pretreated silica fume is obtained. S4: Add 1g of graphene oxide to 200mL of deionized water and ultrasonically exfoliate for 1h. Then add 100g of pretreated silica fume and 0.5g of silane coupling agent KH550 and stir at 75℃ for 4h. Then add 1g of ascorbic acid and stir for 10min. Filter and freeze dry at -50℃ for 20h. Then add 0.1g of polyvinylpyrrolidone and ball mill until D50 is 3μm to obtain modified silica fume. S5: Add 2.7g Tween 80 and 0.9g Span 80 to 150g deionized water and stir at 3500r / min for 10min. Then add 60g butyl stearate, 15g isophorone diisocyanate and 0.3g nano silica and stir at 3500r / min for 10min. Then add 20g of 8% hexamethylenediamine aqueous solution at 3℃ at 1mL / min and stir for 30min. Adjust the pH to 8 with ammonia water. Stir at 63℃ for 2h and filter. Wash three times with 40% ethanol aqueous solution. Vacuum dry at 35℃ for 20h and pass through a 200-mesh sieve to obtain microcapsule particles. S6: Add 0.8g of hydroxypropyl methylcellulose to 100g of deionized water and stir at 75℃ for 10min. After cooling to 35℃, add 10g of ethylene-vinyl acetate copolymer and 0.1g of defoamer BYK-024 and stir for 20min. Then defoam under vacuum at -0.08MPa for 15min to obtain a latex solution. S7: Add 80g of quartz sand with a particle size of 0.1-2mm, 1.4g of sodium sulfate, and 15g of deionized water to 60g of cement and stir at 180r / min for 3min. Then add 20g of pretreated tire powder, 10g of diatomaceous earth, 5g of modified silica fume, 4g of quartz powder, and 2g of talc powder and stir at 260r / min for 4min. Then add 70g of latex solution and stir at 120r / min for 3min. Finally, add 8g of microcapsule particles and 30g of latex solution and stir at 60r / min for 2min. After adding 0.5g of nano calcium carbonate, seal and let stand for 40min to obtain the sound insulation adhesive for ceramic tiles.

[0024] Example 2: A method for preparing a sound-insulating adhesive for ceramic tiles is as follows: S1: Add 3.5g of silane coupling agent KH570 to 225g of deionized water and stir for 25min. Then adjust the pH to 4.5 with glacial acetic acid and stir for 15min to obtain the coupling agent solution. S2: Add 110g of waste tire powder to 325g of sodium hydroxide aqueous solution with a mass fraction of 7% and sonicate at 58℃ for 2.5h. After filtration, wash with deionized water until the pH is 7.3. Then add to 227g of coupling agent solution and stir for 35min. Finally filter and dry at 103℃ to obtain pretreated tire powder. S3: Add 120g of silica fume to 250g of 2% sodium hydroxide aqueous solution and stir at 78℃ for 1.5h. Then centrifuge and wash with deionized water until pH 7.3. After drying, pretreated silica fume is obtained. S4: Add 1.1g of graphene oxide to 210mL of deionized water and ultrasonically exfoliate for 1.5h. Then add 105g of pretreated silica fume and 0.8g of silane coupling agent KH550 and stir at 78℃ for 4.5h. Then add 1.3g of ascorbic acid and stir for 15min. Filter and freeze dry at -50℃ for 25h. Then add 0.15g of polyvinylpyrrolidone and ball mill until D50 is 3.5μm to obtain modified silica fume. S5: Add 3g Tween 80 and 1g Span 80 to 165g deionized water and stir at 3800r / min for 13min. Then add 66g butyl stearate, 16.5g isophorone diisocyanate and 0.4g nano silica and stir at 3800r / min for 13min. Then add 22g of 9% hexamethylenediamine aqueous solution at 4℃ at 1mL / min and stir for 35min. Adjust the pH to 8.3 with ammonia water. Stir at 64℃ for 2.2h and filter. Wash 4 times with 45% ethanol aqueous solution. Vacuum dry at 38℃ for 25h and pass through a 300-mesh sieve to obtain microcapsule particles. S6: Add 1g of hydroxypropyl methylcellulose to 106g of deionized water and stir at 78℃ for 15min. After cooling to 38℃, add 13g of ethylene-vinyl acetate copolymer and 0.2g of defoamer BYK-024 and stir for 25min. Then defoam under vacuum at -0.08MPa for 18min to obtain a latex solution. S7: Add 55g of quartz sand with a particle size of 0.1-2mm, 30g of river sand with a particle size of 0.1-2mm, 1.9g of sodium sulfate, and 18g of deionized water to 75g of cement and stir at 190r / min for 4min. Then add 30g of pretreated tire powder, 11g of diatomaceous earth, 6g of modified silica fume, 7.8g of quartz powder, and 3.2g of talc powder and stir at 280r / min for 4.5min. Then add 75g of latex solution and stir at 135r / min for 4min. Finally, add 9g of microcapsule particles and 35g of latex solution and stir at 65r / min for 2.5min. After adding 0.8g of nano calcium carbonate, seal and let stand for 50min to obtain the sound insulation adhesive for ceramic tiles.

[0025] Example 3: A method for preparing a sound-insulating adhesive for ceramic tiles is as follows: S1: Add 5g of silane coupling agent KH570 to 250g of deionized water and stir for 30min. Then adjust the pH to 5 with glacial acetic acid and stir for 20min to obtain the coupling agent solution. S2: Add 120g of waste tire powder to 350g of sodium hydroxide aqueous solution with a mass fraction of 8% and sonicate at 60℃ for 3h. After filtration, wash with deionized water until pH is 7.5. Then add to 255g of coupling agent solution and stir for 40min. Finally filter and dry at 105℃ to obtain pretreated tire powder. S3: Add 130g of silica fume to 300g of 2% sodium hydroxide aqueous solution and stir at 80℃ for 2h. Then centrifuge and wash with deionized water until pH 7.5. After drying, pretreated silica fume is obtained. S4: Add 1.2g of graphene oxide to 220mL of deionized water and ultrasonically exfoliate for 2h. Then add 110g of pretreated silica fume and 1g of silane coupling agent KH550 and stir at 80℃ for 5h. Then add 1.5g of ascorbic acid and stir for 20min. Filter and freeze dry at -50℃ for 30h. Then add 0.2g of polyvinylpyrrolidone and ball mill until D50 is 4μm to obtain modified silica fume. S5: Add 3.2g Tween 80 and 1.1g Span 80 to 180g deionized water and stir at 4000r / min for 15min. Then add 72g butyl stearate, 18g isophorone diisocyanate and 0.5g nano silica and stir at 4000r / min for 15min. Then add 24g of 10% hexamethylenediamine aqueous solution at 5℃ at 1mL / min and stir for 40min. Adjust the pH to 8.5 with ammonia water. Stir at 65℃ for 2.5h and filter. Wash 5 times with 50% ethanol aqueous solution. Vacuum dry at 40℃ for 30h and pass through a 400-mesh sieve to obtain microcapsule particles. S6: Add 1.2g of hydroxypropyl methylcellulose to 113g of deionized water and stir at 80℃ for 20min. After cooling to 40℃, add 16g of ethylene-vinyl acetate copolymer and 0.3g of defoamer BYK-024 and stir for 30min. Then defoam under vacuum at -0.08MPa for 20min to obtain a latex solution. S7: Add 90g of basalt sand with a particle size of 0.1-2mm, 2.4g of sodium sulfate, and 20g of deionized water to 90g of cement and stir at 200r / min for 5min. Then add 40g of pretreated tire powder, 12g of diatomaceous earth, 7g of modified silica fume, 12g of quartz powder, and 4g of talc powder and stir at 300r / min for 5min. Then add 80g of latex solution and stir at 150r / min for 5min. Finally, add 10g of microcapsule particles and 40g of latex solution and stir at 70r / min for 3min. After adding 1g of nano calcium carbonate, seal and let stand for 60min to obtain the sound insulation adhesive for ceramic tiles.

[0026] Comparative Example 1: Compared with Example 1, this comparative example only replaces the "pretreated tire powder" added in the preparation process of S7 with "waste tire powder". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, a sound-insulating adhesive for ceramic tiles is obtained.

[0027] Comparative Example 2: Compared with Example 1, this comparative example only did not add "pretreated tire powder" in the preparation process of S7. All other steps and parameters were the same, and will not be repeated here. The final product is a sound-insulating adhesive for ceramic tiles.

[0028] Comparative Example 3: Compared with Example 1, this comparative example only omits the addition of "modified silica fume" in the preparation process of S7. All other steps and parameters are the same, and will not be repeated here. The final product is a sound-insulating adhesive for ceramic tiles.

[0029] Comparative Example 4: Compared with Example 1, this comparative example only did not add "modified microcapsule particles" in the preparation process of S7. All other steps and parameters were the same, and will not be repeated here. The final product is a sound-insulating adhesive for ceramic tiles.

[0030] Comparative Example 5: Compared with Example 1, this comparative example only did not add "diatomaceous earth" in the preparation process of S7. All other steps and parameters were the same, and will not be repeated here. The final product is a sound-insulating adhesive for ceramic tiles.

[0031] Performance testing: Clean, dry ceramic tiles with dimensions of 50×50mm were used as the substrate. A 2-3mm thick layer of sound-insulating adhesive for ceramic tiles was evenly applied to the surface of the substrate using a 6mm×6mm notched trowel. The ceramic tiles were then pasted and a 2kg weight was applied and held for 30 seconds. After curing at 25℃ for 7 days, a test specimen of the sound-insulating adhesive for ceramic tiles was obtained.

[0032] Measurement of sound insulation capability: Referring to GB / T 19889.3-2005 "Acoustic Buildings and Building Components Sound Insulation Measurement Part 3: Laboratory Measurement of Airborne Sound Insulation of Building Components", the sound insulation capacity (dB) of the sound-insulating adhesives for ceramic tiles prepared in Examples 1-3 and Comparative Examples 1-5 of this invention was determined, and the test results are shown in Table 1. Determination of tensile bond strength: Referring to GB / T 41058-2021 "Technical Requirements for Ceramic Tile Adhesives", the tensile bond strength (MPa) of the ceramic tile sound insulation adhesive specimens prepared in Examples 1-3 and Comparative Examples 1-5 of this invention was determined, and the test results are shown in Table 1. Water resistance test: Referring to GB / T 41058-2021 "Technical Requirements for Ceramic Tile Adhesives", the tensile bond strength retention rate (%) of the ceramic tile sound insulation adhesive specimens prepared in Examples 1-3 and Comparative Examples 1-5 of this invention after being immersed in deionized water at 25°C for 7 days was determined to reflect the water resistance. The test results are shown in Table 1. Determination of heat aging resistance: Referring to GB / T 41059-2021 "Technical Requirements for Ceramic Tile Adhesives", the tensile bond strength retention rate (%) of the ceramic tile sound insulation adhesive specimens prepared in Examples 1-3 and Comparative Examples 1-5 of this invention after being treated in an oven at 70°C for 14 days was determined to reflect the heat aging resistance. The test results are shown in Table 1. Determination of flexibility: Referring to GB / T 41059-2021 "Technical Requirements for Ceramic Tile Adhesives", the transverse deformation (mm) of the sound-insulating adhesives for ceramic tiles prepared in Examples 1-3 and Comparative Examples 1-5 of this invention was measured to reflect flexibility. The test results are shown in Table 1. Table 1: Performance test results of Examples 1-3 and Comparative Examples 1-5 Data Analysis: As can be seen from Table 1, the sound-insulating adhesive for ceramic tiles prepared in the embodiments of the present invention has excellent sound insulation ability, tensile bond strength, water resistance, heat aging resistance and flexibility.

[0033] In Comparative Example 2, no pretreated tire powder was added, while in Comparative Example 1, the pretreated tire powder was replaced with an equal amount of waste tire powder. The results showed that the sound insulation, water resistance, and flexibility of Comparative Example 2 were all lower than those of the control examples, with a greater decrease. This indicates that the pretreated waste tire powder can more effectively improve the sound insulation, water resistance, and flexibility of the ceramic tile sound-insulating adhesive. Comparative Example 3 did not add modified silica fume, and Comparative Example 4 did not add microcapsule particles. The results showed that the properties of Comparative Example 3 and Comparative Example 4 were lower than those of the control examples. This indicates that the addition of modified silica fume and microcapsule particles in this invention can effectively improve sound insulation, tensile bond strength, water resistance, heat aging resistance, and flexibility. Comparative Example 5, without diatomaceous earth, showed a decrease in sound insulation, tensile bond strength, and heat aging resistance. This is because diatomaceous earth's unique porous structure can adsorb and scatter sound waves, enhancing the porosity of the adhesive and improving sound absorption efficiency. Diatomaceous earth can also fill the voids within the system, strengthening interfacial adhesion. Furthermore, it can reduce the risk of thermal shrinkage or degradation at high temperatures, enhancing the material's resistance to temperature changes. Additionally, it can synergistically interact with inorganic components in the system, improving tensile bond strength.

[0034] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A sound-insulating adhesive for ceramic tiles, characterized in that, The raw materials include the following parts by weight: 60-90 parts cement, 80-90 parts mineral aggregate, 1.4-2.4 parts sodium sulfate, 15-20 parts deionized water, 20-40 parts pretreated tire powder, 10-12 parts diatomaceous earth, 5-7 parts modified silica fume, 6-16 parts mineral aggregate, 110-130 parts latex solution, 8-10 parts microcapsule particles, and 0.5-1 parts nano calcium carbonate; The pretreated tire powder is waste tire powder that has been treated with sodium hydroxide aqueous solution and then modified with silane coupling agent KH570. The modified silica fume is prepared by combining silica fume pretreated with sodium hydroxide with graphene oxide reduced by ascorbic acid under the action of silane coupling agent KH550. The microcapsule particles are microcapsules with butyl stearate as the core material and polyurea, formed by the reaction of isophorone diisocyanate and hexamethylenediamine, as the wall material.

2. The sound-insulating adhesive for ceramic tiles according to claim 1, characterized in that, The mineral aggregate is any one or more of quartz sand, river sand, and basalt sand; The mineral aggregate is quartz powder and talc powder in a mass ratio of 2-3:

1.

3. The sound-insulating adhesive for ceramic tiles according to claim 1, characterized in that, The method for preparing the pretreated tire powder is as follows: A1: Add silane coupling agent KH570 to deionized water and stir well. Then adjust the pH to 4-5 with glacial acetic acid and stir well to obtain the coupling agent solution. A2: Add waste tire powder to an aqueous sodium hydroxide solution and sonicate at 55-60℃ for 2-3 hours. After filtration, wash the precipitate, then add it to a coupling agent solution and stir for 30-40 minutes. Finally, filter and dry to obtain pretreated tire powder.

4. The sound-insulating adhesive for ceramic tiles according to claim 3, characterized in that, The mass ratio of deionized water to silane coupling agent KH570 in A1 is 200-250: 2-5; The mass ratio of the sodium hydroxide aqueous solution, waste tire powder, and coupling agent solution in A2 is 300-350:100-120:200-255; The sodium hydroxide aqueous solution described in A2 has a mass fraction of 6%-8%.

5. The sound-insulating adhesive for ceramic tiles according to claim 1, characterized in that, The modified silica fume is prepared as follows: B1: Add silica fume to sodium hydroxide aqueous solution and stir at 75-80℃ for 1-2 hours. Then centrifuge, wash the precipitate, and dry to obtain pretreated silica fume. B2: Add graphene oxide to deionized water and ultrasonically exfoliate for 1-2 hours. Then add pretreated silica fume and silane coupling agent KH550 and stir at 75-80℃ for 4-5 hours. Then add ascorbic acid and stir for 10-20 minutes. After filtration and freeze-drying, add polyvinylpyrrolidone and ball mill to obtain modified silica fume.

6. The sound-insulating adhesive for ceramic tiles according to claim 5, characterized in that, The mass ratio of sodium hydroxide aqueous solution to silica fume in B1 is 200-300: 110-130; The sodium hydroxide aqueous solution described in B1 has a mass fraction of 2%; The mass ratio of deionized water, graphene oxide, pretreated silica fume, silane coupling agent KH550, ascorbic acid, and polyvinylpyrrolidone in B2 is 200-220:1-1.2:100-110:0.5-1:1-1.5:0.1-0.

2.

7. The sound-insulating adhesive for ceramic tiles according to claim 1, characterized in that, The microcapsule particles are prepared as follows: Add Tween 80 and Span 80 to deionized water and stir at 3500-4000 rpm for 10-15 min. Then add butyl stearate, isophorone diisocyanate, and nano silica and stir at 3500-4000 rpm for 10-15 min. Next, add hexamethylenediamine aqueous solution at 3-5℃ and stir for 30-40 min. Adjust the pH to 8-8.5 and stir at 63-65℃ for 2-2.5 h. After filtration, wash the precipitate, vacuum dry, and sieve to obtain microcapsule particles.

8. The sound-insulating adhesive for ceramic tiles according to claim 7, characterized in that, The mass ratio of the deionized water, Tween 80, Span 80, butyl stearate, isophorone diisocyanate, nano silica, and hexamethylenediamine aqueous solution is 150-180: 2.7-3.2: 0.9-1.1: 60-72: 15-18: 0.3-0.5: 20-24. The mass fraction of the hexamethylenediamine aqueous solution is 8%-10%.

9. The sound-insulating adhesive for ceramic tiles according to claim 1, characterized in that, The method for preparing the latex solution is as follows: Add hydroxypropyl methylcellulose to deionized water and stir at 75-80℃. After cooling to 35-40℃, add ethylene-vinyl acetate copolymer and defoamer BYK-024 and stir for 20-30 minutes. Then defoam under vacuum to obtain latex solution. The mass ratio of the deionized water, hydroxypropyl methylcellulose, ethylene-vinyl acetate copolymer, and defoamer BYK-024 is 100-113:0.8-1.2:10-16:0.1-0.

3.

10. A method for preparing a sound-insulating adhesive for ceramic tiles according to any one of claims 1-9, characterized in that, Includes the following steps; Add mineral aggregates, sodium sulfate, and deionized water to cement and stir well. Then add pretreated tire powder, diatomaceous earth, modified silica fume, and mineral aggregates and stir well. Then add latex solution 1 and stir well. Finally, add microcapsule particles and latex solution 2 and stir well. Add nano calcium carbonate and seal and let stand for 40-60 minutes to obtain a sound-insulating adhesive for ceramic tiles. The mass ratio of latex solution 1 to latex solution 2 is 80-90:30-40.

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