Tile adhesive flexibility-promoting composition and tile adhesive

Abstract

The present invention relates to a tile adhesive flexibility-enhancing composition comprising the following components, by weight: 5% to 25% wood fiber, 5% to 25% polypropylene fiber, 10% to 35% superabsorbent resin, 10% to 20% diacetone acrylamide, and 10% to 20% adipic acid dihydrazide. This composition, as a key component of tile adhesive, when mixed with other components to form the tile adhesive, significantly enhances the flexibility of the tile adhesive. Using this tile adhesive for tile laying can effectively reduce undesirable phenomena such as hollowing and cracking of the tiles.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a tile adhesive flexibility promoting composition and tile adhesive. Background Art

[0002] Ceramic tiles are an indispensable building material in building decoration. They come in a variety of types and sizes. Consumers can choose different types of tiles according to their preferences and uses.

[0003] With the development of the ceramic tile market, large and extra-large slabs of ceramic tiles are becoming increasingly popular. These types of tiles are not suitable for paving with traditional cement mortar and usually require the use of specialized tile adhesives. Currently, the common tile adhesives on the market are of poor quality. When these common tile adhesives are used to lay large and extra-large slabs of ceramic tiles, undesirable phenomena such as hollowing or cracking often occur. Summary of the Invention

[0004] Based on this, the present application provides a tile adhesive flexibility-promoting composition, which can be used as an important component of tile adhesive to improve the flexibility of tile adhesive.

[0005] Furthermore, the present application also provides a tile adhesive that can reduce undesirable phenomena such as hollowing and cracking of tiles.

[0006] One embodiment of the present application provides a tile adhesive flexibility-promoting composition, comprising the following components by weight percentage:

[0007]

[0008]

[0009] In one embodiment, the tile adhesive flexibility-promoting composition satisfies at least one of the following conditions:

[0010] (1) The length of the wood fiber is 0.5 mm to 5 mm;

[0011] (2) The length of the polypropylene fiber is 0.5 mm to 5 mm.

[0012] In one embodiment, the composition comprises the following components by weight:

[0013]

[0014] In one embodiment, the components further include at least one of rubber powder, vitrified microspheres and metakaolin.

[0015] In one embodiment, the composition comprises the following components by weight:

[0016]

[0017]

[0018] In one embodiment, the tile adhesive flexibility-promoting composition satisfies at least one of the following conditions:

[0019] (1) The fineness of the rubber powder is 60 mesh to 90 mesh;

[0020] (2) The fineness of the vitrified microspheres is 90-120 mesh;

[0021] (3) The fineness of the metakaolin is D90 ≥ 15 μm.

[0022] One embodiment of the present application provides a tile adhesive, comprising the components of the tile adhesive flexibility-promoting composition as described in any of the above embodiments.

[0023] In one embodiment, the tile adhesive has a flexibility grade not lower than S1, and comprises the following components by weight percentage:

[0024]

[0025] In one embodiment, the tile adhesive has a flexibility grade not lower than S2, and comprises the following components by weight percentage:

[0026]

[0027]

[0028] The tile adhesive flexibility-promoting composition is the tile adhesive flexibility-promoting composition described in any of the above embodiments.

[0029] In one embodiment, the tile adhesive satisfies at least one of the following conditions:

[0030] (1) The cement is a Portland cement with a 28-day strength of ≥42.5 MPa;

[0031] (2) The fineness of the first silica sand is 30 mesh to 70 mesh;

[0032] (3) The fineness of the second silica sand is 70 mesh to 140 mesh.

[0033] An embodiment of the present application provides a method for laying ceramic tiles, comprising the following steps:

[0034] The tiles are laid using the tile adhesive described in any of the above embodiments.

[0035] An embodiment of the present application provides a building structure, comprising a substrate and tiles, wherein the substrate and the tiles are bonded together by the tile adhesive as described in any of the above embodiments.

[0036] The above-mentioned tile adhesive flexibility-promoting composition contains wood fiber, polypropylene fiber, super absorbent resin, diacetone acrylamide and adipic acid dihydrazide, among which wood fiber and polypropylene fiber are beneficial to improving the toughness of tile adhesive. After mixing them with the cement and other mortar systems in the tile adhesive, they are three-dimensionally distributed in the mortar system to form a spatial three-dimensional structure, which can effectively improve the phenomenon of local stress concentration in the mortar and reduce the source of cracks in the laying of tiles; the super absorbent resin can realize pre-water absorption treatment of the tile adhesive after laying, which can effectively reduce the shrinkage of the tile adhesive due to water loss and drying in the later stage of tile laying using the tile adhesive, thereby helping to reduce internal stress and meet the requirements of improving the flexibility of the tile adhesive; adipic acid dihydrazide and diacetone acrylamide will cross-link under water conditions, which is beneficial to improve the flexibility of the tile adhesive. Wood fiber, polypropylene fiber, highly absorbent resin, diacetone acrylamide and adipic acid dihydrazide are mixed in specific weight percentages to prepare a tile adhesive flexibility-promoting composition. This composition, as an important component of tile adhesive, is mixed with other components to prepare tile adhesive, which can greatly improve the flexibility of the tile adhesive. Using this tile adhesive for tile laying can effectively reduce undesirable phenomena such as hollowing and cracking of tiles.

[0037] Furthermore, the use of the above-mentioned tile adhesive flexibility-promoting composition can greatly reduce the amount of cellulose ether and redispersible latex powder added to the tile adhesive, which is relatively expensive, is beneficial to reducing costs and is more environmentally friendly. DETAILED DESCRIPTION

[0038] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with embodiment.The present invention can be implemented in many different forms and is not limited to the embodiments described herein.On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0041] One embodiment of the present invention provides a tile adhesive flexibility-promoting composition, comprising the following components by weight percentage:

[0042]

[0043] Large or extra-large tiles often experience hollowing or cracking in the later stages of laying. The main reasons for these adverse phenomena are, on the one hand, that the bonding strength of the tile adhesive used is insufficient and the tiles are not firmly bonded; on the other hand, the flexibility of the tile adhesive used (i.e., its lateral deformation ability) is poor. After the tiles are laid with tile adhesive, when the tile adhesive is deformed by stress, it cannot produce corresponding deformation to offset this effect.

[0044] To this end, the industry standard "JC / T 547-2017 Ceramic Tile Adhesives" stipulates that cement-based tile adhesives suitable for bonding large or extra-large ceramic tiles must meet a strength grade of C2 enhanced or higher. Specifically, the design requirements for the bond strength of the tile adhesive are: tensile bond strength ≥ 1.0 MPa when untreated, tensile bond strength ≥ 1.0 MPa after immersion in water, and tensile bond strength ≥ 1.0 MPa after freeze-thaw cycles. Furthermore, the industry standard requires the tile adhesive to meet S1 or S2 flexibility grades. Specifically, the design requirements for the flexibility of tile adhesives are: for flexibility grade S1, the lateral deformation capacity of the tile adhesive must be at least 2.5 mm, and for flexibility grade S2, the lateral deformation capacity of the tile adhesive must be at least 5 mm.

[0045] The inventors have discovered that the aforementioned tile adhesive flexibility-enhancing composition, when further formulated into tile adhesive, exhibits tensile bond strengths of ≥1.0 MPa in untreated form, after immersion in water, and after freeze-thaw cycles, meeting the C2 enhanced performance requirements for high-grade tile adhesives. Furthermore, the composition significantly improves the flexibility of the tile adhesive, enhancing its ability to deform laterally under stress, achieving S1 or even S2 flexibility standards.

[0046] Furthermore, the inventors have discovered that the C2 enhanced tile adhesive currently available on the market, suitable for large or extra-large tiles, regardless of its flexibility level of S1 or S2, requires the use of a large amount of cellulose ether and glue powder in the tile adhesive formula to achieve a higher flexibility level. Cellulose ethers can further include, for example, methyl cellulose, hydroxypropyl methyl cellulose, etc. Cellulose ethers have water-retaining, bonding, and lubricating properties, effectively improving the bond strength and flexibility of tile adhesives and reducing tile cracking. Glue powder is typically a redispersible latex powder, and can further include, for example, vinyl acetate-ethylene copolymer, acrylic redispersible glue powder, styrene-acrylic glue powder, etc. Glue powder, especially redispersible latex powder, has a significant enhancing effect on the bond strength, water resistance, freeze-thaw resistance, and flexibility of tile adhesives. For conventional C2 enhanced tile adhesives on the market, when the flexibility grade reaches S1, the cellulose ether content usually needs to reach more than 0.3%, and the content of rubber powder materials such as redispersible latex powder usually needs to reach more than 5%; when the flexibility grade reaches S2, the cellulose ether content usually needs to reach more than 0.3%, and the content of rubber powder materials such as redispersible latex powder usually needs to reach more than 12%. However, the prices of raw materials such as cellulose ether and redispersible latex powder on the market are very expensive. Adding large amounts of them will lead to high production costs of tile adhesives. In addition, the energy consumption in the production process of cellulose ether and redispersible latex powder is high, and it is easy to generate a large amount of toxic wastewater. It is difficult to degrade and has an adverse impact on the environment. The above-mentioned tile adhesive flexibility-promoting composition can replace part of the cellulose ether and redispersible latex powder in the traditional tile adhesive formula. After adding a certain amount of the above-mentioned tile adhesive flexibility-promoting composition to the tile adhesive formula, the bonding strength and flexibility level of the tile adhesive can be reduced while the amount of cellulose ether and redispersible latex powder is reduced. The amount of high-cost raw materials such as cellulose ether and redispersible latex powder is reduced, and the introduced tile adhesive flexibility-promoting composition is affordable. The performance level of the tile adhesive obtained after the improved formula remains unchanged while the production cost of the product is greatly reduced. In addition, reducing the amount of cellulose ether and redispersible latex powder can make the tile adhesive more green and environmentally friendly.

[0047] Specifically, in the above-mentioned tile adhesive flexibility-promoting composition:

[0048] Wood fiber and polypropylene fiber are beneficial to improving the toughness of tile adhesive. After mixing them with cement and other mortar systems in tile adhesive, they are distributed three-dimensionally in the mortar system to form a spatial structure, which can effectively improve the phenomenon of local stress concentration in the mortar and reduce the source of cracks in laying tiles.

[0049] In a specific example, the length of the wood fiber is 0.5 mm to 5 mm. It is understood that the length of the wood fiber can be, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., without limitation. The wood fiber can be a single length or a mixture of multiple lengths. Preferably, the length of the wood fiber is 1 mm to 3 mm.

[0050] In a specific example, the length of the polypropylene fiber is 0.5 mm to 5 mm. It is understood that the length of the polypropylene fiber can be, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., without limitation. The polypropylene fiber can be a single length or a mixture of multiple lengths. Preferably, the length of the polypropylene fiber is 1 mm to 3 mm.

[0051] Super absorbent resin (SAP) can achieve pre-water absorption treatment of tile adhesive after paving, which can effectively reduce the shrinkage of tile adhesive due to water loss and drying in the later stage of tile paving, thereby helping to reduce internal stress and achieve the requirement of improving the flexibility of tile adhesive. In a specific example, super absorbent resin comes from BASF in Germany, and the product model is S 3911F.

[0052] Adipic acid dihydrazide is a bifunctional compound, and diacetone acrylamide carries highly electronegative oxygen and nitrogen atoms. It is an important monomer containing unsaturated vinyl groups and also contains amino groups. When adipic acid dihydrazide and diacetone acrylamide are used in combination, cross-linking will occur under aqueous conditions, which can effectively improve the water resistance and flexibility of tile adhesives.

[0053] The above-mentioned tile adhesive flexibility-promoting composition is prepared by mixing and compounding wood fiber, polypropylene fiber, super absorbent resin, diacetone acrylamide and adipic acid dihydrazide according to specific weight percentages. After the composition is mixed with other components as an important component of tile adhesive to form tile adhesive, it can not only make the tile adhesive reach the C2 enhanced performance index suitable for large or extra-large tile paving, but also greatly improve the flexibility of the tile adhesive, which can reach the flexibility level S1 or above. Using this tile adhesive for tile paving can effectively reduce the hollowing, cracking and other undesirable phenomena of tiles.

[0054] In a specific example, for a tile adhesive with a flexibility grade of S1, the tile adhesive flexibility-promoting composition preferably includes the following components by weight percentage:

[0055]

[0056]

[0057] The tile adhesive flexibility-promoting composition is formulated according to the above weight percentage, which can improve the overall performance of the tile adhesive with a flexibility grade of S1.

[0058] It can be understood that the above-mentioned tile adhesive flexibility-promoting composition can be used as one of the important components of tile adhesive to further prepare tile adhesive with a flexibility grade not lower than S1.

[0059] In a specific example, the tile adhesive with a flexibility grade not lower than S1 includes the following components by weight percentage:

[0060]

[0061] Furthermore, when achieving an S2 flexibility grade for tile adhesive, the adhesive must exhibit stronger lateral deformation capabilities, placing even higher demands on the tile adhesive flexibility-enhancing composition. Based on the above, the inventors have further improved the tile adhesive flexibility-enhancing composition by adding at least one of rubber powder, vitrified microspheres, and metakaolin to the original components.

[0062] In a specific example, for a tile adhesive with a flexibility grade of S2, the tile adhesive flexibility-promoting composition preferably includes the following components by weight percentage:

[0063]

[0064]

[0065] Rubber powder is preferably renewable rubber powder, primarily derived from waste rubber and tires. It is a widely used environmentally friendly material. Incorporating rubber powder into the additive can further enhance the flexibility of tile adhesive. In a specific example, the rubber powder has a fineness of 60 to 90 mesh. It is understood that the fineness of the rubber powder can be, for example, 60 mesh, 65 mesh, 70 mesh, 75 mesh, 80 mesh, 85 mesh, 90 mesh, and so on, without limitation. The rubber powder can have a single fineness or a mixture of multiple finenesses. Preferably, the rubber powder has a fineness of 70 to 85 mesh.

[0066] Vitrified microspheres are a lightweight aggregate with very stable performance. They can improve the fluidity and self-resistance of cement-based tile adhesives, which helps reduce the material shrinkage caused by drying and water loss, and can further improve the bonding strength and flexibility of tile adhesives, which helps reduce the hollowing, cracking and other undesirable phenomena after tile laying. In a specific example, the fineness of the vitrified microspheres is 90 mesh to 120 mesh. It can be understood that the fineness of the vitrified microspheres can be, for example, 90 mesh, 95 mesh, 100 mesh, 105 mesh, 110 mesh, 115 mesh, 120 mesh, etc., but is not limited to this. The vitrified microspheres can have only a single fineness or a mixture of multiple finenesses. Preferably, the fineness of the vitrified microspheres is 95 mesh to 105 mesh.

[0067] Introducing the rubber powder and vitrified microbeads into the above-mentioned tile adhesive flexibility-promoting composition system can reduce the overall dry density of the tile adhesive while minimizing the impact on the strength, which is beneficial to improving the overall performance of the tile adhesive product.

[0068] Metakaolin is a highly active mineral admixture that can enhance the early strength of tile adhesives. When combined with other ingredients in the additive system, it can enhance the adhesive's bonding and flexibility. In a specific example, the fineness of the metakaolin is D90 ≥ 15 μm.

[0069] By adding a certain amount of at least one of rubber powder, vitrified microspheres and metakaolin to the original tile adhesive flexibility-promoting composition system composed of wood fiber, polypropylene fiber, super absorbent resin, diacetone acrylamide and adipic acid dihydrazide, the tensile bonding strength of the tile adhesive when untreated, after immersion in water and after freeze-thaw cycles can meet the basic performance C2 enhanced grade requirements of high-grade tile adhesive. In addition, the lateral deformation capacity of the tile adhesive is further improved to more than 5mm, meeting the flexibility grade S2 requirement.

[0070] It is understandable that the tile adhesive flexibility-promoting composition formulated for tile adhesive with a flexibility grade of S2 can further be used to produce a tile adhesive with a flexibility grade not lower than S2. In a specific example, the tile adhesive with a flexibility grade not lower than S2 includes the following components by weight percentage:

[0071]

[0072] It can be understood that, whether the tile adhesive has a flexibility grade of S1 or S2, its raw materials, except for the tile adhesive flexibility-promoting composition provided in one embodiment of the present invention, are all commonly used raw materials for making tile adhesive.

[0073] Furthermore, the cement may be, for example, ordinary Portland cement having a 28-day strength of ≥42.5 MPa.

[0074] Furthermore, the first silica sand may be, for example, ordinary silica sand with a fineness of 30 to 70 meshes.

[0075] Furthermore, the second silica sand may be, for example, ordinary silica sand with a fineness of 70 to 140 meshes.

[0076] It is understandable that when preparing the above-mentioned tile adhesive, not only can the prefabricated flexibility-promoting composition according to the percentage of each component be directly added, but the corresponding components can also be directly mixed with other components of the tile adhesive according to the formula of the flexibility-promoting composition to prepare the tile adhesive.

[0077] An embodiment of the present invention further provides a method for laying ceramic tiles, comprising the following steps:

[0078] Lay the tiles using tile adhesive such as in any of the examples above.

[0079] Furthermore, the above method may also include the steps of preparing the tile adhesive flexibility-promoting composition in any of the above examples, and compounding the tile adhesive flexibility-promoting composition with other raw materials to prepare a tile adhesive with a specific performance grade.

[0080] It is understandable that the above-mentioned tile adhesive usually needs to be mixed with water or other liquids before use.

[0081] One embodiment of the present invention further provides a building structure, comprising a substrate and tiles, wherein the substrate and the tiles are bonded together by a tile adhesive as described in any of the above examples.

[0082] The present invention is described in detail below with reference to specific examples. In the following specific examples, unless otherwise specified, all raw materials can be sourced from commercial sources.

[0083] in:

[0084] The manufacturer of super absorbent resin is BASF of Germany, with the brand name S 3911F;

[0085] The manufacturer of cellulose ether is Northern Tianpu Cellulose Co., Ltd., and the brand is 1005p;

[0086] The manufacturer of the redispersible latex powder is Wacker Chemical (China) Co., Ltd., and the brand is 5010N;

[0087] The manufacturer of metakaolin is BASF of Germany, and the brand is Metamax high-activity metakaolin.

[0088] Example 1

[0089] The flexibility grade of the tile adhesive is S1. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0090] Tile adhesive flexibility promoting composition: comprising the following components by weight: 20% wood fiber, 20% polypropylene fiber, 30% highly absorbent resin, 15% diacetone acrylamide, and 15% adipic acid dihydrazide.

[0091] Tile adhesive: comprising the following components by weight: 33% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.3% cellulose ether, 4% redispersible latex powder, and 3% tile adhesive flexibility-promoting composition.

[0092] Example 2

[0093] The flexibility grade of the tile adhesive is S1. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0094] Tile adhesive flexibility promoting composition: comprising the following components by weight: 20% wood fiber, 20% polypropylene fiber, 30% highly absorbent resin, 15% diacetone acrylamide, and 15% adipic acid dihydrazide.

[0095] Tile adhesive: comprising the following components by weight: 31% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.3% cellulose ether, 4% redispersible latex powder, and 5% tile adhesive flexibility-promoting composition.

[0096] Example 3

[0097] The flexibility grade of the tile adhesive is S1. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0098] Tile adhesive flexibility promoting composition: comprising the following components by weight: 20% wood fiber, 20% polypropylene fiber, 30% highly absorbent resin, 15% diacetone acrylamide, and 15% adipic acid dihydrazide.

[0099] Tile adhesive: comprising the following components by weight: 29% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.3% cellulose ether, 4% redispersible latex powder, and 7% tile adhesive flexibility-promoting composition.

[0100] Example 4

[0101] The flexibility grade of the tile adhesive is S1. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0102] Tile adhesive flexibility promoting composition: comprising the following components by weight: 20% wood fiber, 20% polypropylene fiber, 30% highly absorbent resin, 15% diacetone acrylamide, and 15% adipic acid dihydrazide.

[0103] Tile adhesive: comprising the following components by weight: 29.15% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.15% cellulose ether, 4% redispersible latex powder, and 7% tile adhesive flexibility-promoting composition.

[0104] Example 5

[0105] The flexibility grade of the tile adhesive is S1. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0106] Tile adhesive flexibility promoting composition: comprising the following components by weight: 15% wood fiber, 15% polypropylene fiber, 30% highly absorbent resin, 20% diacetone acrylamide, and 20% adipic acid dihydrazide.

[0107] Tile adhesive: comprising the following components by weight: 29.15% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.15% cellulose ether, 4% redispersible latex powder, and 7% tile adhesive flexibility-promoting composition.

[0108] Example 6

[0109] The flexibility grade of the tile adhesive is S1. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0110] Tile adhesive flexibility promoting composition: comprising the following components by weight: 25% wood fiber, 25% polypropylene fiber, 26% highly absorbent resin, 12% diacetone acrylamide, and 12% adipic acid dihydrazide.

[0111] Tile adhesive: comprising the following components by weight: 29.15% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.15% cellulose ether, 4% redispersible latex powder, and 7% tile adhesive flexibility-promoting composition.

[0112] Comparative Example 1

[0113] The composition formula of the tile adhesive flexibility promoting composition and the tile adhesive is as follows:

[0114] Tile adhesive flexibility promoting composition: comprising the following components by weight percentage: 50% highly absorbent resin, 25% diacetone acrylamide, and 25% adipic acid dihydrazide.

[0115] Tile adhesive: comprising the following components by weight: 29.15% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.15% cellulose ether, 4% redispersible latex powder, and 7% tile adhesive flexibility-promoting composition.

[0116] Comparative Example 2:

[0117] Traditional tile adhesive with a flexibility grade of S1 does not contain a tile adhesive flexibility-promoting composition. The composition formula of the tile adhesive is as follows:

[0118] Tile adhesive: comprising the following components by weight: 35% cement, 0.7% calcium formate, 20% first silica sand, 39% second silica sand, 0.3% cellulose ether, and 5% redispersible latex powder.

[0119] The tile adhesives prepared in Examples 1 to 6 and Comparative Examples 1 and 2 were tested for bond strength and lateral deformation performance according to the industry standard "JC / T547-2017 Ceramic Tile Adhesives." Tile laying experiments were also conducted on pre-leveled walls. Commercially available 600*600 vitrified tiles were used, and double-sided adhesive was applied. The tile adhesive layer thickness was controlled to approximately 1.5 cm. Four tiles were adhered with the tile adhesive prepared in each Example and Comparative Example, and hollowing was observed after 28 days of curing. The test results are shown in Table 1.

[0120] Table 1. Tile adhesive performance test results of Examples 1 to 6 and Comparative Examples 1 to 2

[0121]

[0122]

[0123]

[0124] As shown in Table 1 above, compared to Comparative Example 2, Examples 1 to 6 show that the addition of a tile adhesive flexibility-promoting composition comprising wood fiber, polypropylene fiber, a superabsorbent resin, diacetone acrylamide, and adipic acid dihydrazide results in a certain loss in the untreated tile adhesive's bond strength, but an improvement in the bond strength after both immersion in water and freeze-thaw cycles. Even with a 20% reduction in the amount of redispersible latex powder, the tile adhesive still maintains a bond strength of ≥1.0 MPa in the untreated state, after immersion in water, and after freeze-thaw cycles, meeting the C2 strength grade standard. The lateral deformation capacity is ≥2.5 mm, meeting the S1 flexibility grade standard. A comparison of Examples 1 to 4 indicates that increasing the amount of the tile adhesive flexibility-promoting composition improves the lateral deformation capacity, resulting in improved tile adhesive flexibility.

[0125] Furthermore, the prepared tile adhesive was used to lay tiles and observe the hollowing situation. It can be seen that compared with Comparative Example 2, the addition of the tile adhesive flexibility-promoting composition to the components of the tile adhesive in Examples 1 to 6 can significantly improve the hollowing situation of the tiles. When the addition amount of the tile adhesive flexibility-promoting composition reaches 7%, the hollowing situation decreases by 25%, and the effect is obvious.

[0126] Compared with Comparative Example 1, Examples 4 to 6 adjusted the mass percentages of the components of the tile adhesive flexibility-promoting composition. The lateral deformation capacity of the tile adhesives prepared in Examples 4 to 6 was ≥2.5 mm, while the lateral deformation capacity of the tile adhesive prepared in Comparative Example 1 was <2.5 mm. It can be seen that when the mass percentages of the components of the tile adhesive flexibility-promoting composition exceed the ranges of 5% to 25% of wood fiber, 5% to 25% of polypropylene fiber, 10% to 35% of super absorbent resin, 10% to 20% of diacetone acrylamide, and 10% to 20% of adipic acid dihydrazide, the prepared tile adhesive cannot meet the flexibility grade S1 or above.

[0127] Example 7

[0128] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0129] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 10% wood fiber, 10% polypropylene fiber, 10% super absorbent resin, 15% diacetone acrylamide, 15% adipic acid dihydrazide, 10% rubber powder, 20% glass microspheres, and 10% metakaolin.

[0130] Tile adhesive: comprising the following components by weight: 28% cement, 0.7% calcium formate, 17% first silica sand, 35% second silica sand, 0.3% cellulose ether, 9% redispersible latex powder, and 10% tile adhesive flexibility-promoting composition.

[0131] Example 8

[0132] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0133] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 10% wood fiber, 10% polypropylene fiber, 10% super absorbent resin, 15% diacetone acrylamide, 15% adipic acid dihydrazide, 10% rubber powder, 20% glass microspheres, and 10% metakaolin.

[0134] Tile adhesive: comprising the following components by weight: 26% cement, 0.7% calcium formate, 17% first silica sand, 35% second silica sand, 0.3% cellulose ether, 9% redispersible latex powder, and 12% tile adhesive flexibility-promoting composition.

[0135] Example 9

[0136] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0137] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 10% wood fiber, 10% polypropylene fiber, 10% super absorbent resin, 15% diacetone acrylamide, 15% adipic acid dihydrazide, 10% rubber powder, 20% glass microspheres, and 10% metakaolin.

[0138] Tile adhesive: comprising the following components by weight: 24% cement, 0.7% calcium formate, 17% first silica sand, 35% second silica sand, 0.3% cellulose ether, 9% redispersible latex powder, and 14% tile adhesive flexibility-promoting composition.

[0139] Example 10

[0140] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0141] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 10% wood fiber, 10% polypropylene fiber, 10% super absorbent resin, 15% diacetone acrylamide, 15% adipic acid dihydrazide, 10% rubber powder, 20% glass microspheres, and 10% metakaolin.

[0142] Tile adhesive: comprising the following components by weight: 24% cement, 0.7% calcium formate, 17% first silica sand, 35.1% second silica sand, 0.2% cellulose ether, 9% redispersible latex powder, and 14% tile adhesive flexibility-promoting composition.

[0143] Example 11

[0144] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0145] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 10% wood fiber, 10% polypropylene fiber, 20% super absorbent resin, 10% diacetone acrylamide, 10% adipic acid dihydrazide, 10% rubber powder, 20% glass microspheres, and 10% metakaolin.

[0146] Tile adhesive: comprising the following components by weight: 24% cement, 0.7% calcium formate, 17% first silica sand, 35.1% second silica sand, 0.2% cellulose ether, 9% redispersible latex powder, and 14% tile adhesive flexibility-promoting composition.

[0147] Example 12

[0148] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0149] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 12% wood fiber, 12% polypropylene fiber, 10% super absorbent resin, 10% diacetone acrylamide, 10% adipic acid dihydrazide, 15% rubber powder, 25% glass beads, and 6% metakaolin.

[0150] Tile adhesive: comprising the following components by weight: 24% cement, 0.7% calcium formate, 17% first silica sand, 35.1% second silica sand, 0.2% cellulose ether, 9% redispersible latex powder, and 14% tile adhesive flexibility-promoting composition.

[0151] Example 13

[0152] The flexibility grade of the tile adhesive is S2. Specifically, the composition formula of the tile adhesive flexibility-promoting composition and the tile adhesive is as follows:

[0153] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 5% wood fiber, 5% polypropylene fiber, 15% super absorbent resin, 20% diacetone acrylamide, 20% adipic acid dihydrazide, 5% rubber powder, 15% glass beads, and 15% metakaolin.

[0154] Tile adhesive: comprising the following components by weight: 24% cement, 0.7% calcium formate, 17% first silica sand, 35.1% second silica sand, 0.2% cellulose ether, 9% redispersible latex powder, and 14% tile adhesive flexibility-promoting composition.

[0155] Comparative Example 3

[0156] The composition formula of the tile adhesive flexibility promoting composition and the tile adhesive is as follows:

[0157] Tile adhesive flexibility promoting composition: includes the following components by weight percentage: 20% wood fiber, 20% polypropylene fiber, 10% super absorbent resin, 0% diacetone acrylamide, 0% adipic acid dihydrazide, 20% rubber powder, 20% glass microspheres, and 10% metakaolin.

[0158] Tile adhesive: comprising the following components by weight: 24% cement, 0.7% calcium formate, 17% first silica sand, 35.1% second silica sand, 0.2% cellulose ether, 9% redispersible latex powder, and 14% tile adhesive flexibility-promoting composition.

[0159] Comparative Example 4

[0160] Traditional tile adhesive with a flexibility grade of S2 does not contain a tile adhesive flexibility-promoting composition. The composition formula of the tile adhesive is as follows:

[0161] Tile adhesive: comprising the following components by weight: 30% cement, 0.7% calcium formate, 20% first silica sand, 37% second silica sand, 0.3% cellulose ether, and 12% redispersible latex powder.

[0162] The S2-grade tile adhesives prepared in Examples 6-11 and Comparative Examples 3-4 were tested for bond strength and lateral deformation according to the industry standard "JC / T 547-2017 Ceramic Tile Adhesives." Tile laying experiments were also conducted on pre-leveled walls. Commercially available 600*600 vitrified tiles were used, and double-sided adhesive was applied. The adhesive layer thickness was controlled to approximately 1.5 cm. Four tiles were bonded using the tile adhesive prepared in each Example and Comparative Example, and hollowing was observed after 28 days of curing. The test results are shown in Table 2.

[0163] Table 2. Tile adhesive performance test results of Examples 7 to 13 and Comparative Examples 3 to 4

[0164]

[0165]

[0166]

[0167] As shown in Table 2 above, compared to Comparative Example 4, Examples 7-13 show a slight decrease in the untreated tile adhesive's bond strength after adding the tile adhesive flexibility-enhancing composition, comprising wood fiber, polypropylene fiber, superabsorbent resin, diacetone acrylamide, adipic acid dihydrazide, rubber powder, vitrified microspheres, and metakaolin. However, the bond strength improves after both water immersion and freeze-thaw cycles. Furthermore, even with a 25% reduction in the amount of redispersible latex powder and a 33% reduction in the amount of cellulose ether, the tile adhesive still maintains a bond strength of ≥1.0 MPa in the untreated state, after water immersion, and after freeze-thaw cycles, meeting the C2 grade standard. Furthermore, the lateral deformation capacity is ≥5 mm, meeting the S2 flexibility grade standard.

[0168] From the comparison of Examples 7 to 9, it can be concluded that as the amount of the tile adhesive flexibility-promoting composition added increases, the lateral deformation ability is also improved to a certain extent, that is, the flexibility of the tile adhesive is better.

[0169] Compared with Examples 10 to 13 and Comparative Example 3, when the tile adhesive flexibility-promoting composition contains 5% to 15% wood fiber, 5% to 15% polypropylene fiber, 10% to 20% super absorbent resin, 10% to 20% diacetone acrylamide, 10% to 20% adipic acid dihydrazide, 5% to 15% rubber powder, 15% to 25% glass microspheres, and 5% to 15% metakaolin, the overall strength of the tile adhesive meets the C2 strength standard and the flexibility meets the S2 standard. When exceeding this range, the strength and flexibility of the tile adhesive are reduced, and the tile adhesive of Comparative Example 3 can no longer meet the C2 strength standard.

[0170] Furthermore, the prepared tile adhesive was used to lay tiles and observe the hollowing situation. It can be seen that the addition of the tile adhesive flexibility promoting composition to the components of the tile adhesive is beneficial to reducing the occurrence of hollowing, especially when the addition amount of the tile adhesive flexibility promoting composition reaches 14%, completely no hollowing can be achieved, and the tile laying effect is good.

[0171] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A tile adhesive flexibility-promoting composition, characterized in that: Calculated by weight percentage, it includes the following components:

2. The tile adhesive flexibility-promoting composition according to claim 1, characterized in that: The tile adhesive flexibility promoting composition satisfies at least one of the following conditions: (1) The length of the wood fiber is 0.5 mm to 5 mm; (2) The length of the polypropylene fiber is 0.5 mm to 5 mm.

3. The tile adhesive flexibility-promoting composition according to any one of claims 1 to 2, characterized in that: The components further include at least one of rubber powder, vitrified microspheres and metakaolin.

4. The tile adhesive flexibility-promoting composition according to claim 3, characterized in that: Calculated by weight percentage, it includes the following components:

5. The tile adhesive flexibility-promoting composition according to claim 4, characterized in that: The tile adhesive flexibility promoting composition satisfies at least one of the following conditions: (1) The fineness of the rubber powder is 60 mesh to 90 mesh; (2) The fineness of the vitrified microspheres is 90-120 mesh; (3) The fineness of the metakaolin is D90 ≥ 15 μm.

6. A tile adhesive, characterized in that: The invention comprises the components of the tile adhesive flexibility promoting composition according to any one of claims 1 to 5.

7. The tile adhesive according to claim 6, characterized in that: The flexibility grade of the tile adhesive is not lower than S1 grade. The tile adhesive comprises the following components in terms of weight percentage:

8. The tile adhesive according to claim 6, characterized in that The flexibility grade of the tile adhesive is not lower than S2 grade. The tile adhesive comprises the following components by weight percentage: The tile adhesive flexibility-promoting composition is the tile adhesive flexibility-promoting composition according to any one of claims 4 to 6.

9. The tile adhesive according to any one of claims 7 to 8, characterized in that: The tile adhesive satisfies at least one of the following conditions: (1) The cement is a Portland cement with a 28-day strength of ≥42.5 MPa; (2) The fineness of the first silica sand is 30 mesh to 70 mesh; (3) The fineness of the second silica sand is 70 mesh to 140 mesh.

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