High-durability ceramic tile adhesive and preparation process thereof

Abstract

The invention relates to the technical field of bonding, in particular to a high-durability ceramic tile adhesive and a preparation process thereof. The mildew-proof and mildew-proof building material is prepared from the following components in parts by weight: 8 to 12 parts of a modified reinforcing agent, 45 to 55 parts of cement, 23 to 32 parts of quartz sand, 1 to 3 parts of cellulose ether, 1 to 5 parts of L-lysine triisocyanate, 0.8 to 1.4 parts of a propiconazole mildew-proof agent and 0.6 to 1.1 parts of a BASF Pluraxol P4250 water reducing agent, wherein the modified reinforcing agent is prepared by mixing dihydroxyl-terminated polydimethylsiloxane and tartaric acid according to the mass ratio of (5-10): 1. According to the scheme, the problem of durability of the ceramic tile adhesive is effectively solved by adopting the modified reinforcing agent, the mechanical property and high temperature resistance of the ceramic tile adhesive are improved through crosslinking of the dihydroxyl-terminated polydimethylsiloxane and the L-lysine triisocyanate, the wettability of the dihydroxyl-terminated polydimethylsiloxane to a base material is improved by utilizing the tartaric acid, and the service life of the ceramic tile adhesive is prolonged. The quantity of active functional groups is increased, the mechanical occlusion force between the ceramic tile and a base material is improved, and the risk that the ceramic tile falls off is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bonding, in particular to a high-durability tile adhesive and a preparation process thereof. Background Art

[0002] Tile adhesive, as one of the indispensable materials in modern building decoration, plays a key role in firmly adhering tiles to various base surfaces. It not only ensures that tiles are both beautiful and stable on walls or floors, but also greatly broadens the boundaries of tile application scenarios, making tile decoration no longer limited by traditional materials and processes. Tile adhesives are mainly made of cement, quartz sand, high molecular polymers and a variety of functional additives in a scientific ratio. These ingredients work synergistically to give tile adhesives excellent bonding strength, impermeability, weather resistance and construction convenience. Compared with traditional cement mortar, tile adhesives have higher bonding strength and lower shrinkage, which can effectively avoid hollowing and falling off caused by base deformation or tile self-weight, greatly extending the service life of decoration projects. However, existing tile adhesives are prone to lose bonding strength in high temperature environments, resulting in tile falling off and poor durability. In view of this, we propose a high-durability tile adhesive and its preparation process. Summary of the invention

[0003] The object of the present invention is to provide a highly durable tile adhesive and a preparation process thereof to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides a highly durable tile adhesive, comprising the following components: 8-12 parts by weight of a modifier and enhancer, 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 a propiconazole mildew preventer, and 0.6-1.1 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5 to 10:1.

[0005] Preferably, the preparation method of the modified enhancer is as follows: Add tartaric acid into water and dissolve it, stir until it is completely dissolved to prepare a tartaric acid aqueous solution, place dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, and stir and mix evenly with a high-speed shear mixer. Under continuous stirring, add the tartaric acid aqueous solution drop by drop into the dihydroxy-terminated polydimethylsiloxane solution, and continue stirring for 20-30 minutes to ensure that the two components are evenly mixed. Place the mixed emulsion in a constant temperature water bath to react. After the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 50-60°C for 12-24 hours to obtain a modified enhancer.

[0006] Dihydroxy-terminated polydimethylsiloxane is a linear high molecular weight polysiloxane synthetic material with excellent high and low temperature resistance, aging resistance and chemical corrosion resistance. Adding it to tile adhesives can effectively improve the stability and durability of the adhesives under harsh environmental conditions and extend their service life.

[0007] Dihydroxy-terminated polydimethylsiloxane can react with other crosslinking agents to form a stable network structure and improve the strength and durability of the material. The main chain of dihydroxy-terminated polydimethylsiloxane is composed of silicon-oxygen bonds, and the side chain is methyl, which is highly hydrophobic. The hydroxyl groups at both ends of the molecule make it have a certain hydrophilicity, but this hydrophilicity is relatively weak, so it mainly manifests as hydrophobicity. Hydrophobic substances have the problem of not being able to fully wet the substrate, so it is difficult to evenly spread and form the required bonding layer, which increases the difficulty of construction. Therefore, tartaric acid is added to modify the dihydroxy-terminated polydimethylsiloxane. Tartaric acid contains 2 carboxyl groups and 2 hydroxyl groups. By increasing the hydrophilic groups on the dihydroxy-terminated polydimethylsiloxane, the problem of dihydroxy-terminated polydimethylsiloxane is solved. The wettability problem of siloxane is solved. At the same time, hydroxyl and carboxyl groups can form hydrogen bonds with hydroxyl groups or other polar groups on the surface of the substrate and chelate with metal ions, which enhances the adhesion between the adhesive and the substrate and the cohesion of the adhesive, and helps to reduce the risk of hollowing or falling off. In addition, the introduction of more active functional groups can increase the cross-linking density. Higher cross-linking density means more cross-linking points. These cross-linking points fix the polymer chains like "anchors" and restrict their movement. Even if the temperature rises, the free movement of the polymer chains is inhibited due to the existence of the cross-linking network, and the entire network structure can still maintain a certain integrity, thereby maintaining a higher modulus and mechanical properties, further improving the high temperature resistance of the adhesive, and then improving the durability of the adhesive.

[0008] L-lysine triisocyanate has three isocyanate groups that can undergo cross-linking reactions with the hydroxyl groups on the modified dihydroxy-terminated polydimethylsiloxane to form a network structure, promote the curing reaction, reduce the curing time, and thus improve the overall construction efficiency.

[0009] Preferably, the mass fraction of the tartaric acid aqueous solution is 5-10%.

[0010] Preferably, the mass ratio of the Tween 80 surfactant to tartaric acid is 1 to 3:5.

[0011] Preferably, the rotation speed of the high-speed shear mixer is 5000-8000 rpm / min, and the stirring time is 5-10 min.

[0012] Preferably, the temperature of the constant temperature water bath is controlled at 60-80°C, and the reaction time is 2-4h.

[0013] On the other hand, the present invention provides a preparation process of a high-durability tile adhesive, which is used to prepare the above-mentioned high-durability tile adhesive, comprising the following steps: Add cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer to the mixer in sequence, stir at 300-500 rpm for 20-30 min to mix evenly, then add the modifier and continue stirring, then add L-lysine triisocyanate, finally add water while mixing, adjust the state of the mixture, use a high-speed stirrer at 1000-1500 rpm to stir for 10-15 min, and obtain a highly durable tile adhesive.

[0014] Preferably, the particle size of the quartz sand is 50-200 mesh.

[0015] Preferably, the amount of water added is 23%-35% of the total weight of the mixture.

[0016] Preferably, the dihydroxy-terminated polydimethylsiloxane has a kinematic viscosity of 500-2000 cst at 25°C.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the highly durable tile adhesive and its preparation process, a modified reinforcing agent is used, and the dihydroxy-terminated polydimethylsiloxane has excellent high and low temperature resistance, so the temperature resistance of the adhesive is improved, and the loss of bonding strength at high temperature is prevented, which causes the tiles to fall off. The dihydroxy-terminated polydimethylsiloxane is modified by tartaric acid, so that its hydrophilic groups are increased, and its wettability on the surface of the substrate is improved. At the same time, the reactive functional groups on the dihydroxy-terminated polydimethylsiloxane are increased, and a stable network structure is formed with L-lysine triisocyanate, which significantly improves the high modulus and mechanical properties at high temperatures, and further improves the bonding strength of the adhesive to tiles and walls, effectively improving the durability of the tile adhesive. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0019] A highly durable tile adhesive of the present invention comprises the following components: 8-12 parts by weight of a modifier and enhancer, 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 a propiconazole mildew preventer, and 0.6-1.1 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5 to 10:1.

[0020] Embodiment 1: A highly durable tile adhesive and a preparation process thereof, comprising the following steps: Prepare the following components: 12 parts by weight of a 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 a propiconazole mildew preventer, and 1.1 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-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; Add tartaric acid to water and dissolve it, stir until it is completely dissolved, prepare a tartaric acid aqueous solution with a mass fraction of 10%, place the dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, stir and mix evenly with a high-speed shear mixer, the speed is 5000rpm / min, the stirring time is 10min, under continuous stirring, dropwise add the tartaric acid aqueous solution to the dihydroxy-terminated polydimethylsiloxane solution, continue stirring for 30min to ensure that the two components are evenly mixed, place the mixed emulsion in a constant temperature water bath for reaction, the temperature is controlled at 80℃, the reaction time is 3h, after the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 60℃ for 12h to obtain a modified enhancer; Cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer were added to the mixer in sequence, and the mixture was evenly mixed by stirring at 300 rpm for 20 min. Then, the modified enhancer was added and the stirring was continued. Then, L-lysine triisocyanate was added. Finally, water was added while mixing, and the amount of water added was 30% of the total weight of the mixture. The state of the mixture was adjusted, and the mixture was stirred at 1200 rpm for 10 min using a high-speed stirrer to obtain a highly durable tile adhesive.

[0021] Embodiment 2: A highly durable tile adhesive and a preparation process thereof, comprising the following steps: Prepare the following components: 12 parts by weight of a 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 a propiconazole mildew preventer, and 1.1 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-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; Add tartaric acid to water and dissolve it, stir until it is completely dissolved, prepare a tartaric acid aqueous solution with a mass fraction of 10%, place the dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, stir and mix evenly with a high-speed shear mixer, the speed is 5000rpm / min, the stirring time is 10min, under continuous stirring, dropwise add the tartaric acid aqueous solution to the dihydroxy-terminated polydimethylsiloxane solution, continue stirring for 30min to ensure that the two components are evenly mixed, place the mixed emulsion in a constant temperature water bath for reaction, the temperature is controlled at 80℃, the reaction time is 3h, after the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 60℃ for 12h to obtain a modified enhancer; Cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer were added to the mixer in sequence, and the mixture was evenly mixed by stirring at 300 rpm for 20 min. Then, the modified enhancer was added and the stirring was continued. Then, L-lysine triisocyanate was added. Finally, water was added while mixing, and the amount of water added was 30% of the total weight of the mixture. The state of the mixture was adjusted, and the mixture was stirred at 1200 rpm for 10 min using a high-speed stirrer to obtain a highly durable tile adhesive.

[0022] Embodiment 3: A highly durable tile adhesive and a preparation process thereof, comprising the following steps: Prepare the following components: 12 parts by weight of a 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 a propiconazole mildew preventer, and 1.1 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-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; Add tartaric acid to water and dissolve it, stir until it is completely dissolved, prepare a tartaric acid aqueous solution with a mass fraction of 10%, place the dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, stir and mix evenly with a high-speed shear mixer, the speed is 5000rpm / min, the stirring time is 10min, under continuous stirring, dropwise add the tartaric acid aqueous solution to the dihydroxy-terminated polydimethylsiloxane solution, continue stirring for 30min to ensure that the two components are evenly mixed, place the mixed emulsion in a constant temperature water bath for reaction, the temperature is controlled at 80℃, the reaction time is 3h, after the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 60℃ for 12h to obtain a modified enhancer; Cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer were added to the mixer in sequence, and the mixture was evenly mixed by stirring at 300 rpm for 20 min. Then, the modified enhancer was added and the stirring was continued. Then, L-lysine triisocyanate was added. Finally, water was added while mixing, and the amount of water added was 30% of the total weight of the mixture. The state of the mixture was adjusted, and the mixture was stirred at 1200 rpm for 10 min using a high-speed stirrer to obtain a highly durable tile adhesive.

[0023] Embodiment 4: A highly durable tile adhesive and a preparation process thereof, comprising the following steps: Prepare the following components: 12 parts by weight of a 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 a propiconazole mildew preventer, and 0.6 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 10:1; the mass ratio of Tween 80 surfactant to tartaric acid is 1:5; Add tartaric acid to water and dissolve it, stir until it is completely dissolved, prepare a tartaric acid aqueous solution with a mass fraction of 10%, place the dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, stir and mix evenly with a high-speed shear mixer, the speed is 5000rpm / min, the stirring time is 10min, under continuous stirring, dropwise add the tartaric acid aqueous solution to the dihydroxy-terminated polydimethylsiloxane solution, continue stirring for 30min to ensure that the two components are evenly mixed, place the mixed emulsion in a constant temperature water bath for reaction, the temperature is controlled at 80℃, the reaction time is 3h, after the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 60℃ for 12h to obtain a modified enhancer; Cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer were added to the mixer in sequence, and the mixture was evenly mixed by stirring at 300 rpm for 20 min. Then, the modified enhancer was added and the stirring was continued. Then, L-lysine triisocyanate was added. Finally, water was added while mixing, and the amount of water added was 30% of the total weight of the mixture. The state of the mixture was adjusted, and the mixture was stirred at 1200 rpm for 10 min using a high-speed stirrer to obtain a highly durable tile adhesive.

[0024] Embodiment 5: A highly durable tile adhesive and a preparation process thereof, comprising the following steps: Prepare the following components: 8 parts by weight of a modifier and enhancer, 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 preventer, and 1.1 parts by weight of BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-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; Add tartaric acid to water and dissolve it, stir until it is completely dissolved, prepare a tartaric acid aqueous solution with a mass fraction of 10%, place the dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, stir and mix evenly with a high-speed shear mixer, the speed is 5000rpm / min, the stirring time is 10min, under continuous stirring, dropwise add the tartaric acid aqueous solution to the dihydroxy-terminated polydimethylsiloxane solution, continue stirring for 30min to ensure that the two components are evenly mixed, place the mixed emulsion in a constant temperature water bath for reaction, the temperature is controlled at 80℃, the reaction time is 3h, after the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 60℃ for 12h to obtain a modified enhancer; Cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer were added to the mixer in sequence, and the mixture was evenly mixed by stirring at 300 rpm for 20 min. Then, the modified enhancer was added and the stirring was continued. Then, L-lysine triisocyanate was added. Finally, water was added while mixing, and the amount of water added was 30% of the total weight of the mixture. The state of the mixture was adjusted, and the mixture was stirred at 1200 rpm for 10 min using a high-speed stirrer to obtain a highly durable tile adhesive.

[0025] Embodiment 6: A highly durable tile adhesive and a preparation process thereof, comprising the following steps: Prepare the following components: 10 parts by weight of a 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 a propiconazole mildew preventer, and 1.1 parts by weight of a BASF Pluraxol P4250 water reducer; The modified reinforcing agent is prepared by mixing dihydroxy-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; Add tartaric acid to water and dissolve it, stir until it is completely dissolved, prepare a tartaric acid aqueous solution with a mass fraction of 10%, place the dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, stir and mix evenly with a high-speed shear mixer, the speed is 5000rpm / min, the stirring time is 10min, under continuous stirring, dropwise add the tartaric acid aqueous solution to the dihydroxy-terminated polydimethylsiloxane solution, continue stirring for 30min to ensure that the two components are evenly mixed, place the mixed emulsion in a constant temperature water bath for reaction, the temperature is controlled at 80℃, the reaction time is 3h, after the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 60℃ for 12h to obtain a modified enhancer; Cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer were added to the mixer in sequence, and the mixture was evenly mixed by stirring at 300 rpm for 20 min. Then, the modified enhancer was added and the stirring was continued. Then, L-lysine triisocyanate was added. Finally, water was added while mixing, and the amount of water added was 30% of the total weight of the mixture. The state of the mixture was adjusted, and the mixture was stirred at 1200 rpm for 10 min using a high-speed stirrer to obtain a highly durable tile adhesive.

[0026] Comparative Example 1: The method of Example 3 was adopted without adding a modifier.

[0027] Comparative Example 2: The method of Example 3 was adopted, and the modified reinforcing agent contained only dihydroxy-terminated polydimethylsiloxane, and was not modified by tartaric acid.

[0028] Comparative Example 3: The method of Example 3 was adopted, but the modified reinforcing agent contained only tartaric acid and was not modified with dihydroxy-terminated polydimethylsiloxane.

[0029] The present invention adopts a high-durability tile adhesive prepared by using a modified reinforcing agent, wherein the performance index inspection items and inspection standards of the high-durability tile adhesive are as follows: High temperature resistance, bonding strength and mechanical properties According to the standard JC / T 547-2005 "Ceramic Wall and Floor Tile Adhesive", the tensile bond strength and slip performance of the samples were tested, where the thickness of the tile adhesive coating was 3mm, and its high-temperature tensile bond strength at 70°C was tested, and then the high-temperature tensile bond strength change rate was calculated, high-temperature tensile bond strength change rate = (initial tensile bond strength - tensile bond strength at 70°C) / initial tensile bond strength × 100%; bond strength refers to the maximum force per unit area measured by shear or tensile test; slip refers to the downward sliding of ceramic tiles 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 property. The tiles are less likely to slip when subjected to horizontal forces (such as wind loads, pedestrian trampling, etc.), maintaining the stability and flatness of their positions.

[0030] According to the above standards, the high-durability tile adhesives prepared in the above Examples 1-6 and Comparative Examples 1-3 were tested, and the obtained data are shown in Table 1: Table 1 Performance data of Examples 1-6 and Comparative Examples 1-3

[0031] The above data fully show that compared with Comparative Examples 1-3, Examples 1-6 can fully 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.

[0032] Since the present invention adopts 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 follows: It can be seen from Examples 1-3 that with the increasing proportion of the modified reinforcing agent component, the high temperature resistance, bonding strength and mechanical properties of the tile adhesive are significantly improved. This is because on the basis of the high temperature resistant polymer dihydroxy-terminated polydimethylsiloxane, tartaric acid is used to increase the active functional groups and hydrophilicity of the polymer, and the cross-linking reaction between the multi-active functional groups and L-lysine triisocyanate occurs to increase the cross-linking density. The increase in cross-linking density can make the molecular network inside the adhesive tighter, thereby increasing the mechanical bite force between the tile and the substrate and reducing the risk of tile falling off. Therefore, with the increasing proportion of tartaric acid, the content of active functional groups continues to increase, the cross-linking density increases, and the overall performance of the tile adhesive is improved.

[0033] It can be seen from Examples 3 and 4 that, as the tile adhesive has no significant changes in high temperature resistance, bonding strength and mechanical properties, it can be seen that small changes in other components within a certain range are not sufficient to significantly affect the overall performance of the adhesive, and therefore the performance of the tile adhesive has no significant change.

[0034] It can be seen from Examples 3, 5 and 6 that with the continuous change of the content of the modified reinforcing agent, the high temperature resistance, bonding strength and mechanical properties of the tile adhesive continue to change. This is because the dihydroxy-terminated polydimethylsiloxane has excellent high temperature resistance and can react with L-lysine triisocyanate to form a stable network structure. This network structure can limit the free movement of the polymer chain, thereby significantly improving the high temperature resistance and mechanical properties of the adhesive. The modification of tartaric acid enables the polymer to form hydrogen bonds with the hydroxyl groups or other polar groups on the surface of the substrate, thereby enhancing the adhesion and cohesion between the adhesive and the substrate, reducing the risk of hollowing or falling off, thereby significantly improving the bonding strength.

[0035] According to the above test experiments, the high-durability tile adhesive prepared according to Example 3 has the best performance, so Example 3 is taken as the best example; By comparing Example 3 with Comparative Examples 1-3, it can be seen that: In Comparative Example 1, no modified reinforcing agent is added, and the high temperature resistance, bonding strength and mechanical properties of the tile adhesive are worse. This is because there is a lack of cross-linking reaction between dihydroxy-terminated polydimethylsiloxane and L-lysine triisocyanate, which reduces the mechanical properties and temperature resistance. Secondly, there is a lack of hydrophilic groups, and it is impossible to form effective hydrogen bonds with the hydroxyl groups or other polar groups on the surface of the substrate, so the bonding performance is reduced, and thus the durability is reduced.

[0036] In comparative example 2, the modified reinforcing agent contains only dihydroxy-terminated polydimethylsiloxane, and tartaric acid modification is not used. The tile adhesive has poor high temperature resistance, bonding strength and mechanical properties. This is because the dihydroxy-terminated polydimethylsiloxane itself has weak hydrophilicity. Without tartaric acid modification, its wettability on the surface of the substrate is poor, and it is difficult to form a uniform bonding layer, resulting in insufficient bonding force. In addition, the cross-linking reaction of dihydroxy-terminated polydimethylsiloxane with L-lysine triisocyanate depends on the hydroxyl groups thereon. Without tartaric acid modification, the number of hydroxyl groups on the dihydroxy-terminated polydimethylsiloxane is small, resulting in insufficient cross-linking points, affecting the high temperature resistance and mechanical properties.

[0037] In comparative example 3, the modified reinforcing agent contains only tartaric acid, and is not modified with dihydroxy-terminated polydimethylsiloxane. The high temperature resistance, bonding strength and mechanical properties of the tile adhesive are worse. This is because the dihydroxy-terminated polydimethylsiloxane has a longer molecular chain, can provide better flexibility and elasticity, and can form stronger interactions between molecules. Compared with tartaric acid with a relatively simple molecular structure, it has a more complex cross-linking structure, so the overall performance of the tile adhesive is reduced.

[0038] In summary, the modified enhancer can effectively solve the durability problem of tile adhesives. Through the excellent high temperature resistance of dihydroxy-terminated polydimethylsiloxane and cross-linking with L-lysine triisocyanate to form a complex network structure, the mechanical properties and high temperature resistance of tile adhesives are improved. Tartaric acid is used to improve the wettability of dihydroxy-terminated polydimethylsiloxane to the substrate, and the number of active functional groups is provided, thereby enhancing the cross-linking density, improving the mechanical bite force between tiles and substrates, and reducing the risk of tiles falling off.

[0039] The above shows and describes 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 by the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention, and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A highly durable tile adhesive, characterized in that: The invention comprises the following components: 8-12 parts by weight of a modifying and 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 a propiconazole mildew preventer and 0.6-1.1 parts by weight of a BASF Pluraxol P4250 water reducing agent; The modified reinforcing agent is prepared by mixing dihydroxy-terminated polydimethylsiloxane and tartaric acid in a mass ratio of 5 to 10:

1.

2. The highly durable tile adhesive according to claim 1, characterized in that: The preparation method of the modified enhancer is as follows: Add tartaric acid into water and dissolve it, stir until it is completely dissolved to prepare a tartaric acid aqueous solution, place dihydroxy-terminated polydimethylsiloxane in a beaker, add Tween 80 surfactant, and stir and mix evenly with a high-speed shear mixer. Under continuous stirring, add the tartaric acid aqueous solution drop by drop into the dihydroxy-terminated polydimethylsiloxane solution, and continue stirring for 20-30 minutes to ensure that the two components are evenly mixed. Place the mixed emulsion in a constant temperature water bath to react. After the reaction is completed, let the mixture cool naturally to room temperature, filter to remove impurities, place the product in a vacuum oven, and dry it at 50-60°C for 12-24 hours to obtain a modified enhancer.

3. The highly durable tile adhesive according to claim 2, characterized in that: The mass fraction of the tartaric acid aqueous solution is 5-10%.

4. The highly durable tile adhesive according to claim 2, characterized in that: The mass ratio of the Tween 80 surfactant to tartaric acid is 1 to 3:

5.

5. The highly durable tile adhesive according to claim 2, characterized in that: The rotation speed of the high-speed shear mixer is 5000-8000 rpm / min, and the stirring time is 5-10 min.

6. The highly durable tile adhesive according to claim 2, characterized in that: The temperature of the constant temperature water bath is controlled at 60-80°C, and the reaction time is 2-4h.

7. A process for preparing a highly durable tile adhesive, used for preparing the highly durable tile adhesive according to any one of claims 1 to 6, characterized in that: The steps include: Add cement, quartz sand, cellulose ether, propiconazole mildew inhibitor and BASF Pluraxol P4250 water reducer to the mixer in sequence, stir at 300-500 rpm for 20-30 min to mix evenly, then add the modifier and continue stirring, then add L-lysine triisocyanate, finally add water while mixing, adjust the state of the mixture, use a high-speed stirrer at 1000-1500 rpm to stir for 10-15 min, and obtain a highly durable tile adhesive.

8. The process for preparing the highly durable tile adhesive according to claim 7, characterized in that: The particle size of the quartz sand is 50-200 meshes.

9. The process for preparing the highly durable tile adhesive according to claim 7, characterized in that: The amount of water added is 23%-35% of the total weight of the mixture.

10. The process for preparing the highly durable tile adhesive according to claim 7, characterized in that: The dihydroxy-terminated polydimethylsiloxane has a kinematic viscosity of 500-2000 cst at 25°C.

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