A high-durability tile adhesive and its preparation process

Abstract

This invention relates to the field of adhesive technology, specifically to a high-durability tile adhesive and its preparation process, comprising the following components: 8-12 parts by weight of a modified reinforcing agent, 45-55 parts by weight of cement, 23-32 parts by weight of quartz sand, 1-3 parts by weight of cellulose ether, 1-5 parts by weight of L-lysine triisocyanate, 0.8-1.4 parts by weight of propiconazole antifungal agent, and 0.6-1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent; wherein the modified reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5-10:1. This solution effectively addresses the durability issue of tile adhesives by employing modified reinforcing agents. Through crosslinking of dihydroxyl-terminated polydimethylsiloxane with L-lysine triisocyanate, the mechanical properties and high-temperature resistance of the tile adhesive are improved. Tartaric acid is used to enhance the wettability of the dihydroxyl-terminated polydimethylsiloxane to the substrate and increase the number of active functional groups, thereby increasing the mechanical bonding force between the adhesive and the tile and substrate, and reducing the risk of tile detachment.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, and more specifically, to a high-durability tile adhesive and its preparation process. Background Technology

[0002] Tile adhesive, as an indispensable material in modern building decoration, plays a crucial role in firmly adhering tiles to various substrates. It not only ensures that tiles are both aesthetically pleasing and stable on walls or floors, but also greatly expands the boundaries of tile application scenarios, freeing tile decoration from the limitations of traditional materials and processes. Tile adhesive is mainly composed of cement, quartz sand, polymer, and various functional additives in a scientifically proportioned ratio. These components work synergistically to give tile adhesive excellent bonding strength, impermeability, weather resistance, and ease of construction. Compared with traditional cement mortar, tile adhesive has higher bonding strength and lower shrinkage rate, effectively avoiding problems such as hollowing and detachment caused by substrate deformation or the weight of the tiles themselves, greatly extending the service life of the decoration project. However, existing tile adhesives are prone to losing their bonding strength under high temperature environments, leading to tile detachment and poor durability. In view of this, we propose a high-durability tile adhesive and its preparation process. Summary of the Invention

[0003] The purpose of this invention is to provide a high-durability tile adhesive and its preparation process to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides a high-durability tile adhesive, comprising the following components: 8-12 parts by weight of modified reinforcing agent, 45-55 parts by weight of cement, 23-32 parts by weight of quartz sand, 1-3 parts by weight of cellulose ether, 1-5 parts by weight of L-lysine triisocyanate, 0.8-1.4 parts by weight of propiconazole mildew inhibitor, and 0.6-1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0005] The modifier is prepared by mixing dihydroxy-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5 to 10:1.

[0006] Preferably, the preparation method of the modified reinforcing agent is as follows:

[0007] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare an aqueous tartaric acid solution. The dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred and mixed thoroughly using a high-speed shear mixer. While continuously stirring, the aqueous tartaric acid solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution. Stirring was continued for 20-30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath for reaction. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration. The product was placed in a vacuum oven and dried at 50-60℃ for 12-24 hours to obtain the modified reinforcing agent.

[0008] Dihydroxyl-terminated polydimethylsiloxane is a linear high-molecular-weight polyorganosiloxane synthetic material with excellent high and low temperature resistance, aging resistance and chemical corrosion resistance. Adding it to tile adhesive can effectively improve the stability and durability of the adhesive under harsh environmental conditions and extend its service life.

[0009] Dihydroxyl-terminated polydimethylsiloxanes (PDMS) can react with other crosslinking agents to form a stable network structure, improving the strength and durability of the material. The main chain of PDMS is composed of silicon-oxygen bonds, with methyl groups as side chains, exhibiting strong hydrophobicity. The hydroxyl groups at both ends of the molecule give it a certain degree of hydrophilicity; however, this hydrophilicity is relatively weak, thus primarily manifesting as hydrophobicity. Hydrophobic substances have the problem of not easily wetting the substrate, making it difficult to spread evenly and form the required adhesive layer, increasing the difficulty of construction. Therefore, tartaric acid is added to modify PDMS. Utilizing the two carboxyl groups and two hydroxyl groups on tartaric acid, the hydrophilic groups on the PDMS are increased, thereby solving the problem of PDMS… The wettability of siloxanes is improved, and the hydroxyl and carboxyl groups can form hydrogen bonds with hydroxyl groups or other polar groups on the substrate surface and chelate with metal ions, enhancing the adhesion and cohesiveness of the adhesive to the substrate. This helps reduce the risk of delamination or detachment. In addition, the introduction of more active functional groups can increase the crosslinking density. Higher crosslinking density means more crosslinking points. These crosslinking points act like "anchors" to fix the polymer chains and restrict their movement. Even when the temperature rises, the free movement of the polymer chains is suppressed due to the presence of the crosslinking network, and the entire network structure can still maintain a certain degree of integrity, thereby maintaining high modulus and mechanical properties, further improving the high-temperature resistance of the adhesive, and thus improving the durability of the adhesive.

[0010] L-Lysine triisocyanate has three isocyanate groups that can crosslink with the hydroxyl groups on modified dihydroxyl-terminated polydimethylsiloxane to form a network structure, which promotes the curing reaction, reduces curing time, and thus improves the overall construction efficiency.

[0011] Preferably, the tartaric acid aqueous solution has a mass fraction of 5-10%.

[0012] Preferably, the mass ratio of the Tween 80 surfactant to tartaric acid is 1 to 3:5.

[0013] Preferably, the high-speed shear mixer has a rotation speed of 5000-8000 rpm / min and a stirring time of 5-10 min.

[0014] Preferably, the temperature of the constant temperature water bath is controlled at 60-80℃, and the reaction time is 2-4 hours.

[0015] On the other hand, the present invention provides a preparation process for a high-durability tile adhesive, which includes the following steps:

[0016] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluraxol P4250 water-reducing agent are added sequentially. The mixture is stirred at 300-500 rpm for 20-30 minutes until homogeneous. Then, a modifier and reinforcing agent are added and stirred continuously. Next, L-lysine triisocyanate is added. Finally, water is added while mixing to adjust the state of the mixture. The mixture is then stirred at 1000-1500 rpm for 10-15 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0017] Preferably, the particle size of the quartz sand is 50-200 mesh.

[0018] Preferably, the amount of water added is 23%-35% of the total weight of the mixture.

[0019] Preferably, the dihydroxyl-terminated polydimethylsiloxane has a kinematic viscosity of 500-2000 cst at 25°C.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In this high-durability tile adhesive and its preparation process, a modifier is used to enhance the adhesive's performance. The excellent high and low temperature resistance of dihydroxyl-terminated polydimethylsiloxane is utilized to improve the adhesive's temperature resistance, preventing loss of adhesion at high temperatures and thus preventing tile detachment. Tartaric acid modification of the dihydroxyl-terminated polydimethylsiloxane increases its hydrophilic groups, improving its wettability on the substrate surface. Simultaneously, it enhances the reactive functional groups on the dihydroxyl-terminated polydimethylsiloxane, forming a stable network structure with L-lysine triisocyanate. This significantly improves the high modulus and mechanical properties at high temperatures, further enhancing the adhesive's bond strength to tiles and walls, and effectively improving the durability of the tile adhesive. Detailed Implementation

[0022] 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.

[0023] The present invention provides a high-durability tile adhesive comprising the following components: 8-12 parts by weight of a modified reinforcing agent, 45-55 parts by weight of cement, 23-32 parts by weight of quartz sand, 1-3 parts by weight of cellulose ether, 1-5 parts by weight of L-lysine triisocyanate, 0.8-1.4 parts by weight of propiconazole antifungal agent, and 0.6-1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0024] The modifier is prepared by mixing dihydroxy-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5 to 10:1.

[0025] Example 1: A high-durability tile adhesive and its preparation process, comprising the following steps:

[0026] Preparation of components: 12 parts by weight of modified reinforcing agent, 55 parts by weight of cement, 32 parts by weight of quartz sand, 3 parts by weight of cellulose ether, 5 parts by weight of L-lysine triisocyanate, 1.4 parts by weight of propiconazole mildew inhibitor and 1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0027] The modifier and reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5:1; the mass ratio of Tween 80 surfactant to tartaric acid is 3:5.

[0028] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare a 10% (w / w) tartaric acid aqueous solution. Dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred evenly using a high-speed shear mixer at 5000 rpm for 10 minutes. While continuously stirring, the tartaric acid aqueous solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution, and stirring was continued for 30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath at 80°C for 3 hours. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration, and the product was placed in a vacuum oven and dried at 60°C for 12 hours to obtain the modified reinforcing agent.

[0029] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially and mixed at 300 rpm for 20 minutes until homogeneous. Then, a modifier and reinforcing agent are added and mixing continues. Next, L-lysine triisocyanate is added, and finally, water is added while mixing, with the amount of water being 30% of the total weight of the mixture. The state of the mixture is adjusted, and then it is mixed at 1200 rpm for 10 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0030] Example 2: A high-durability tile adhesive and its preparation process, comprising the following steps:

[0031] Preparation of components: 12 parts by weight of modified reinforcing agent, 55 parts by weight of cement, 32 parts by weight of quartz sand, 3 parts by weight of cellulose ether, 5 parts by weight of L-lysine triisocyanate, 1.4 parts by weight of propiconazole mildew inhibitor and 1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0032] The modifier and reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 8:1; the mass ratio of Tween 80 surfactant to tartaric acid is 3:5.

[0033] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare a 10% (w / w) tartaric acid aqueous solution. Dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred evenly using a high-speed shear mixer at 5000 rpm for 10 minutes. While continuously stirring, the tartaric acid aqueous solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution, and stirring was continued for 30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath at 80°C for 3 hours. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration, and the product was placed in a vacuum oven and dried at 60°C for 12 hours to obtain the modified reinforcing agent.

[0034] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially and mixed at 300 rpm for 20 minutes until homogeneous. Then, a modifier and reinforcing agent are added and mixing continues. Next, L-lysine triisocyanate is added, and finally, water is added while mixing, with the amount of water being 30% of the total weight of the mixture. The state of the mixture is adjusted, and then it is mixed at 1200 rpm for 10 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0035] Example 3: A high-durability tile adhesive and its preparation process, comprising the following steps:

[0036] Preparation of components: 12 parts by weight of modified reinforcing agent, 55 parts by weight of cement, 32 parts by weight of quartz sand, 3 parts by weight of cellulose ether, 5 parts by weight of L-lysine triisocyanate, 1.4 parts by weight of propiconazole mildew inhibitor and 1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0037] The modifier and reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 10:1; the mass ratio of Tween 80 surfactant to tartaric acid is 3:5.

[0038] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare a 10% (w / w) tartaric acid aqueous solution. Dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred evenly using a high-speed shear mixer at 5000 rpm for 10 minutes. While continuously stirring, the tartaric acid aqueous solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution, and stirring was continued for 30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath at 80°C for 3 hours. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration, and the product was placed in a vacuum oven and dried at 60°C for 12 hours to obtain the modified reinforcing agent.

[0039] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially and mixed at 300 rpm for 20 minutes until homogeneous. Then, a modifier and reinforcing agent are added and mixing continues. Next, L-lysine triisocyanate is added, and finally, water is added while mixing, with the amount of water being 30% of the total weight of the mixture. The state of the mixture is adjusted, and then it is mixed at 1200 rpm for 10 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0040] Example 4: A high-durability tile adhesive and its preparation process, comprising the following steps:

[0041] Preparation of components: 12 parts by weight of modified reinforcing agent, 45 parts by weight of cement, 23 parts by weight of quartz sand, 1 part by weight of cellulose ether, 1 part by weight of L-lysine triisocyanate, 0.8 parts by weight of propiconazole mildew inhibitor and 0.6 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0042] The modified reinforcing agent was prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 10:1; the mass ratio of Tween 80 surfactant to tartaric acid was 1:5.

[0043] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare a 10% (w / w) tartaric acid aqueous solution. Dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred evenly using a high-speed shear mixer at 5000 rpm for 10 minutes. While continuously stirring, the tartaric acid aqueous solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution, and stirring was continued for 30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath at 80°C for 3 hours. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration, and the product was placed in a vacuum oven and dried at 60°C for 12 hours to obtain the modified reinforcing agent.

[0044] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially and mixed at 300 rpm for 20 minutes until homogeneous. Then, a modifier and reinforcing agent are added and mixing continues. Next, L-lysine triisocyanate is added, and finally, water is added while mixing, with the amount of water being 30% of the total weight of the mixture. The state of the mixture is adjusted, and then it is mixed at 1200 rpm for 10 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0045] Example 5: A high-durability tile adhesive and its preparation process, comprising the following steps:

[0046] Preparation of components: 8 parts by weight of modified reinforcing agent, 55 parts by weight of cement, 32 parts by weight of quartz sand, 3 parts by weight of cellulose ether, 5 parts by weight of L-lysine triisocyanate, 1.4 parts by weight of propiconazole mildew inhibitor and 1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0047] The modifier and reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 10:1; the mass ratio of Tween 80 surfactant to tartaric acid is 3:5.

[0048] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare a 10% (w / w) tartaric acid aqueous solution. Dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred evenly using a high-speed shear mixer at 5000 rpm for 10 minutes. While continuously stirring, the tartaric acid aqueous solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution, and stirring was continued for 30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath at 80°C for 3 hours. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration, and the product was placed in a vacuum oven and dried at 60°C for 12 hours to obtain the modified reinforcing agent.

[0049] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially and mixed at 300 rpm for 20 minutes until homogeneous. Then, a modifier and reinforcing agent are added and mixing continues. Next, L-lysine triisocyanate is added, and finally, water is added while mixing, with the amount of water being 30% of the total weight of the mixture. The state of the mixture is adjusted, and then it is mixed at 1200 rpm for 10 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0050] Example 6: A high-durability tile adhesive and its preparation process, comprising the following steps:

[0051] Preparation of components: 10 parts by weight of modified reinforcing agent, 55 parts by weight of cement, 32 parts by weight of quartz sand, 3 parts by weight of cellulose ether, 5 parts by weight of L-lysine triisocyanate, 1.4 parts by weight of propiconazole mildew inhibitor and 1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent;

[0052] The modifier and reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 10:1; the mass ratio of Tween 80 surfactant to tartaric acid is 3:5.

[0053] Tartaric acid was dissolved in water and stirred until completely dissolved to prepare a 10% (w / w) tartaric acid aqueous solution. Dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred evenly using a high-speed shear mixer at 5000 rpm for 10 minutes. While continuously stirring, the tartaric acid aqueous solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution, and stirring was continued for 30 minutes to ensure uniform mixing of the two components. The mixed emulsion was placed in a constant-temperature water bath at 80°C for 3 hours. After the reaction was complete, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration, and the product was placed in a vacuum oven and dried at 60°C for 12 hours to obtain the modified reinforcing agent.

[0054] In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially and mixed at 300 rpm for 20 minutes until homogeneous. Then, a modifier and reinforcing agent are added and mixing continues. Next, L-lysine triisocyanate is added, and finally, water is added while mixing, with the amount of water being 30% of the total weight of the mixture. The state of the mixture is adjusted, and then it is mixed at 1200 rpm for 10 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

[0055] Comparative Example 1: The method of Example 3 was used without adding any modifiers or reinforcing agents.

[0056] Comparative Example 2: The method of Example 3 was used, and the modifier contained only dihydroxyl-terminated polydimethylsiloxane, without tartaric acid modification.

[0057] Comparative Example 3: The method of Example 3 was used, but the modifier contained only tartaric acid and was not modified with dihydroxyl-terminated polydimethylsiloxane.

[0058] This invention relates to a high-durability tile adhesive prepared using a modified reinforcing agent. The performance indicators and testing standards for this high-durability tile adhesive are as follows:

[0059] High temperature resistance, bond strength and mechanical properties

[0060] According to the JC / T 547-2005 standard "Ceramic Wall and Floor Tile Adhesives", the tensile bond strength and slip performance of the samples were tested. The thickness of the tile adhesive coating was 3mm, and the high-temperature tensile bond strength at 70℃ was tested. Then, the change rate of high-temperature tensile bond strength was calculated as follows: High-temperature tensile bond strength change rate = (initial tensile bond strength - tensile bond strength at 70℃) / initial tensile bond strength × 100%. Bond strength refers to the maximum force per unit area determined by shear or tensile tests. Slip refers to the downward sliding of the ceramic tile on the vertical surface of the combed adhesive layer, which is part of the mechanical properties. The smaller the slip distance, the better the anti-slip performance. When the tile is subjected to horizontal forces (such as wind loads, pedestrian trampling, etc.), it will not slip, thus maintaining its positional stability and flatness.

[0061] The high-durability tile adhesives prepared in Examples 1-6 and Comparative Examples 1-3 were tested according to the above standards, and the data obtained are shown in Table 1:

[0062] Table 1 Performance data of Examples 1-6 and Comparative Examples 1-3

[0063]

[0064] The above data fully demonstrate that, compared with Comparative Examples 1-3, Examples 1-6 clearly show the effect of the modified reinforcing agent on the high-durability tile adhesive in terms of high temperature resistance, bonding strength, and mechanical properties.

[0065] Because this invention uses a modified reinforcing agent to prepare a high-durability tile adhesive, the performance of the high-durability tile adhesive is effectively improved by the modified reinforcing agent, as detailed below:

[0066] As can be seen from Examples 1-3, with the continuous increase of the proportion of modified reinforcing agent components, the tile adhesive significantly improves in high temperature resistance, bonding strength, and mechanical properties. This is because, based on the use of polydimethylsiloxane with high temperature resistance polymer dihydroxyl-terminated, tartaric acid is used to improve the active functional groups and hydrophilicity of the polymer. Through the crosslinking reaction between the multi-active functional groups and L-lysine triisocyanate, the crosslinking density is increased. The increase in crosslinking density makes the molecular network inside the adhesive more compact, thereby improving the mechanical bonding force between the adhesive and the tile and substrate, and reducing the risk of tile detachment. Therefore, with the continuous increase of the proportion of tartaric acid, the content of active functional groups increases, the crosslinking density increases, and thus the overall performance of the tile adhesive is improved.

[0067] As can be seen from Examples 3 and 4, since there are no significant changes in the high temperature resistance, bonding strength and mechanical properties of the tile adhesive, it can be seen that the small changes in other components within a certain range are not enough to significantly affect the overall performance of the adhesive. Therefore, the performance of the tile adhesive does not change significantly.

[0068] As can be seen from Examples 3, 5, and 6, the tile adhesive exhibits continuous changes in high-temperature resistance, bonding strength, and mechanical properties as the content of the modified reinforcing agent changes. This is because the dihydroxyl-terminated polydimethylsiloxane possesses excellent high-temperature resistance and can react with L-lysine triisocyanate to form a stable network structure. This network structure restricts the free movement of polymer chains, thereby significantly improving the high-temperature resistance and mechanical properties of the adhesive. Furthermore, the modification with tartaric acid enables the polymer to form hydrogen bonds with hydroxyl groups or other polar groups on the substrate surface, enhancing the adhesion and cohesion between the adhesive and the substrate, reducing the risk of hollowing or detachment, and thus significantly improving the bonding strength.

[0069] Based on the above test experiments, it can be seen that the high-durability tile adhesive prepared according to Example 3 has the best performance, so Example 3 is regarded as the best example.

[0070] A comparison of Example 3 with Comparative Examples 1-3 shows that:

[0071] In Comparative Example 1, without the addition of a modifier, the tile adhesive exhibited poorer high-temperature resistance, bonding strength, and mechanical properties. This is because the lack of cross-linking reaction between dihydroxyl-terminated polydimethylsiloxane and L-lysine triisocyanate led to a decrease in mechanical properties and temperature resistance. Furthermore, the lack of hydrophilic groups prevented the formation of effective hydrogen bonds with hydroxyl groups or other polar groups on the substrate surface, resulting in decreased bonding performance and consequently reduced durability.

[0072] Comparative Example 2, which uses a modified reinforcing agent containing only dihydroxyl-terminated polydimethylsiloxane without tartaric acid modification, exhibits poor high-temperature resistance, bonding strength, and mechanical properties in its tile adhesive. This is because dihydroxyl-terminated polydimethylsiloxane itself has weak hydrophilicity. Without tartaric acid modification, its wettability on the substrate surface is poor, making it difficult to form a uniform adhesive layer, resulting in insufficient adhesion. Furthermore, the crosslinking reaction between dihydroxyl-terminated polydimethylsiloxane and L-lysine triisocyanate depends on its hydroxyl groups. Without tartaric acid modification, the number of hydroxyl groups on the dihydroxyl-terminated polydimethylsiloxane is low, leading to insufficient crosslinking points and affecting high-temperature resistance and mechanical properties.

[0073] Comparative Example 3, which uses tartaric acid as the modifier and does not employ dihydroxyl-terminated polydimethylsiloxane modification, resulted in a tile adhesive exhibiting poorer high-temperature resistance, bonding strength, and mechanical properties. This is because dihydroxyl-terminated polydimethylsiloxane has a longer molecular chain, providing better flexibility and elasticity, and allowing for stronger intermolecular interactions. Compared to the relatively simple molecular structure of tartaric acid, it possesses a more complex cross-linking structure, thus leading to a decline in the overall performance of the tile adhesive.

[0074] In summary, the modified reinforcing agent can effectively solve the durability problem of tile adhesives. The excellent high-temperature resistance of dihydroxyl-terminated polydimethylsiloxane, combined with its crosslinking with L-lysine triisocyanate to form a complex network structure, improves the mechanical properties and high-temperature resistance of the tile adhesive. Tartaric acid is used to improve the wettability of the dihydroxyl-terminated polydimethylsiloxane to the substrate and increases the number of active functional groups, enhancing the crosslinking density and improving the mechanical bonding force between the adhesive and the tile and substrate, thus reducing the risk of tile detachment.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A high-durability tile adhesive, characterized in that, It includes the following components: 8-12 parts by weight of modified reinforcing agent, 45-55 parts by weight of cement, 23-32 parts by weight of quartz sand, 1-3 parts by weight of cellulose ether, 1-5 parts by weight of L-lysine triisocyanate, 0.8-1.4 parts by weight of propiconazole mildew inhibitor, and 0.6-1.1 parts by weight of BASF Pluraxol P4250 water-reducing agent; The modified reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5 to 10:

1. The preparation method of the modified reinforcing agent is as follows: Tartaric acid was dissolved in water and stirred until completely dissolved to prepare an aqueous tartaric acid solution. The dihydroxy-terminated polydimethylsiloxane was placed in a beaker, and Tween 80 surfactant was added. The mixture was stirred and mixed evenly with a high-speed shear mixer. While stirring continuously, the aqueous tartaric acid solution was added dropwise to the dihydroxy-terminated polydimethylsiloxane solution. The mixture was stirred for 20-30 minutes to ensure that the two components were evenly mixed. The mixed emulsion was placed in a constant temperature water bath for reaction. After the reaction was completed, the mixture was allowed to cool naturally to room temperature. Impurities were removed by filtration. The product was placed in a vacuum oven and dried at 50-60℃ for 12-24 hours to obtain the modified reinforcing agent. The tartaric acid aqueous solution has a mass fraction of 5-10%. The mass ratio of the Tween 80 surfactant to tartaric acid is 1 to 3:5; The high-speed shear mixer operates at a speed of 5000-8000 rpm and a stirring time of 5-10 min. The temperature of the constant temperature water bath is controlled at 60-80℃, and the reaction time is 2-4 hours.

2. A preparation process for a high-durability tile adhesive, used to prepare the high-durability tile adhesive as described in claim 1, characterized in that, Includes the following steps: In a mixer, cement, quartz sand, cellulose ether, propiconazole mildew inhibitor, and BASF Pluaxol P4250 water-reducing agent are added sequentially. The mixture is stirred at 300-500 rpm for 20-30 minutes until homogeneous. Then, a modifier and reinforcing agent are added and stirred continuously. Next, L-lysine triisocyanate is added. Finally, water is added while mixing to adjust the state of the mixture. The mixture is then stirred at 1000-1500 rpm for 10-15 minutes using a high-speed mixer to obtain a high-durability tile adhesive.

3. The preparation process of the high-durability tile adhesive according to claim 2, characterized in that: The particle size of the quartz sand is 50-200 mesh.

4. The preparation process of the high-durability tile adhesive according to claim 2, characterized in that: The amount of water added should be 23%-35% of the total weight of the mixture.

5. The preparation process of the high-durability tile adhesive according to claim 2, characterized in that: The dihydroxyl-terminated polydimethylsiloxane has a kinematic viscosity of 500-2000 cSt at 25°C.

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