Interface agent capable of improving bonding strength of ceramic tiles as well as preparation method and application of interface agent

Abstract

The invention discloses an interface agent capable of improving the bonding strength of ceramic tiles as well as a preparation method and application of the interface agent. The interface agent is prepared from the following components in parts by weight: 80 to 100 parts of deionized water, 40 to 60 parts of acrylic ester, 20 to 40 parts of styrene, 2 to 5 parts of methacrylic acid, 3 to 6 parts of hydroxyethyl acrylate, 0.5 to 2 parts of 3-methacryloxy propyl trimethoxy silane, 0.5 to 2 parts of allyloxy isomeric alcohol ether sulfate ammonia salt, 0.5 to 2 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.5 to 1.5 parts of potassium persulfate and 0.1 to 0.3 part of 10 percent sodium hydroxide solution. According to the invention, monomers such as methacrylic acid, hydroxyethyl acrylate and 3-methacryloxypropyltrimethoxysilane are introduced, so that the chemical bonding strength and water resistance of the ceramic tile back adhesive and a base material are remarkably enhanced. Styrene improves hardness and wear resistance, and silane monomers improve weather resistance. The prepared interface agent has good bonding strength, water resistance and weather resistance, is environmentally friendly and harmless, meets the national standard and is excellent in construction performance.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to an interface agent that can improve the bonding strength of ceramic tiles, its preparation method, and its application. Background Technology

[0002] In the field of architectural decoration, ceramic tiles, as a widely used surface material, require excellent adhesion, which directly affects the aesthetics and safety of a space. With the continuous development of building materials, low-absorption, large-size ceramic tiles, such as thin ceramic slabs, vitrified tiles, and polished tiles, are becoming increasingly popular. However, existing tile adhesives often experience problems such as tile hollowing and detachment when used with these new types of tiles, especially in humid environments and areas with significant temperature fluctuations. These problems not only affect the aesthetics of buildings but also pose a threat to the life and property safety of users.

[0003] Currently, tile adhesive, as a new type of bonding material, is gradually replacing traditional cement mortar and becoming the ideal choice for tile laying due to its superior performance. Through the action of polymer additives, tile adhesive significantly improves the bonding strength between the tile and the substrate, making the tile adhesion more secure and reliable. However, ordinary tile adhesives and other laying materials still cannot meet the bonding requirements of low-absorption, large-size tiles.

[0004] In existing technologies, a special interface agent for tiles and tile adhesive (referred to as interface agent) is typically used to improve the bonding strength of tiles, thereby avoiding problems such as hollowing and detachment later on. As an auxiliary bonding material, the interface agent plays a crucial role in the tile bonding process. It is an adhesive applied to the back of the tile, forming a thin film with strong adhesion on the tile surface. This film can penetrate into the tiny pores on the back of the tile, forming a tight mechanical bond with the tile, while simultaneously enhancing the bonding strength between the tile and the tile adhesive or cement mortar, fundamentally improving the adhesion of the tiles. However, existing interface agents still have shortcomings in terms of bonding strength, water resistance, and weather resistance. Summary of the Invention

[0005] In order to overcome the shortcomings of existing interface agents in terms of bonding strength, water resistance, and weather resistance, this invention provides an interface agent that can improve the bonding strength of ceramic tiles, its preparation method, and its application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In one aspect, the present invention provides an interface agent that can improve the bonding strength of ceramic tiles, comprising the following components in parts by weight:

[0008] 80-100 parts deionized water, 40-60 parts acrylate, 20-40 parts styrene, 2-5 parts methacrylic acid, 3-6 parts hydroxyethyl acrylate, 0.5-2 parts 3-methacryloyloxypropyltrimethoxysilane, 0.5-2 parts allyloxyisomeric alcohol ether sulfate ammonium salt, 0.5-2 parts 2-acrylamide-2-methylpropanesulfonic acid, 0.5-1.5 parts potassium persulfate, and 0.1-0.3 parts 10% sodium hydroxide solution.

[0009] Acrylic esters, as soft monomers, give emulsions good flexibility and initial tack, enabling them to spread and adhere better on tile surfaces.

[0010] Styrene, as a hard monomer, increases the glass transition temperature of the emulsion, enhances the hardness and wear resistance of the emulsion film, and ensures that the interface agent is not easily deformed during long-term use.

[0011] The introduction of carboxyl functional groups into methacrylic acid allows it to react chemically with metal ions on the tile surface, forming chemical bonds that significantly enhance adhesion strength. Simultaneously, the carboxyl groups also improve the dispersion stability of pigments and fillers in the emulsion.

[0012] Hydroxyethyl acrylate contains hydroxyl functional groups, which can undergo esterification with the carboxyl groups of methacrylic acid to form a cross-linked structure during emulsion film formation, further improving the film's strength and water resistance. Furthermore, the hydroxyl groups can also chemically react with active ingredients in substrates such as cement, enhancing adhesion to the substrate.

[0013] 3-Methacryloyloxypropyltrimethoxysilane possesses a unique chemical structure. Its silane moiety can hydrolyze in water to generate silanol, which then undergoes a condensation reaction with hydroxyl groups on the surface of ceramic tiles or in cementitious substrates, forming strong covalent bonds. This significantly improves the adhesion strength and water resistance of the emulsion to ceramic tiles and substrates. Simultaneously, its vinyl moiety can participate in the polymerization reaction of acrylate monomers, introducing the silane structure into the polymer backbone and endowing the emulsion with better weather resistance and durability.

[0014] Allyloxyisomeric alcohol ether sulfate ammonium salt and 2-acrylamide-2-methylpropanesulfonic acid, as reactive emulsifiers, can participate in the polymerization reaction of monomers. They have excellent emulsifying properties such as low foaming, small emulsion particle size and more stable dispersion, which can improve the water resistance, weather resistance and heat resistance of polymer coatings.

[0015] Potassium persulfate is used to initiate the polymerization of acrylate monomers. It decomposes at a certain temperature to generate free radicals, which then initiate monomer polymerization.

[0016] Sodium hydroxide is used to adjust the pH of emulsions, and emulsions have better storage stability under alkaline conditions.

[0017] As a further embodiment of the present invention: the acrylate is butyl acrylate and / or 2-ethylhexyl acrylate.

[0018] In a second aspect, the present invention provides a method for preparing an interface agent that can improve the bonding strength of ceramic tiles, comprising the following steps:

[0019] (1) Add some deionized water, acrylate, styrene, methacrylic acid, hydroxyethyl acrylate, 3-methacryloyloxypropyltrimethoxysilane, allyloxyisomeric alcohol ether sulfate ammonium salt, and 2-acrylamide-2-methylpropanesulfonic acid to an emulsification kettle, stir and emulsify to prepare an emulsion.

[0020] (2) Dissolve potassium persulfate in part of deionized water to prepare an initiator solution;

[0021] (3) Add some deionized water to the reactor and heat it to 80-88°C. Add 15% of the emulsion and then add 25% of the initiator solution to start the polymerization reaction.

[0022] (4) After 15 to 30 minutes, the remaining emulsion and the remaining initiator solution are added dropwise to the reaction vessel for 3 to 4 hours. After the addition is completed, the mixture is kept warm for 1 to 2 hours, cooled down, neutralized with 10% sodium hydroxide solution, filtered, and the interface agent is obtained.

[0023] As a further aspect of the present invention: in step (1), the weight of the deionized water is 55 to 62 parts.

[0024] As a further embodiment of the present invention: in step (2), the weight of the deionized water is 5 to 8 parts.

[0025] As a further embodiment of the present invention: in step (3), the weight of the deionized water is 20 to 30 parts, which is prepared by the above-mentioned method for preparing an interface agent that can improve the bonding strength of ceramic tiles.

[0026] In a third aspect, the present invention provides the application of the above-mentioned interface agent that can improve the bonding strength of tiles in the field of building decoration.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) This invention introduces a variety of monomers with special functional groups by rationally designing the formulation of acrylic emulsion, such as the carboxyl group of methacrylic acid, the hydroxyl group of hydroxyethyl acrylate, and the silanoxy group of 3-methacryloyloxypropyltrimethoxysilane. These functional groups can react chemically with the chemical components on the surface of the tile and the active components in the cement substrate to form chemical bonds, thereby significantly improving the bonding strength between the tile backing adhesive and the tile and substrate.

[0029] (2) This invention introduces 3-methacryloyloxypropyltrimethoxysilane, which forms strong covalent bonds with the tile surface and cement substrate during the emulsion film formation process. The silanol produced by its hydrolysis can also form hydrogen bonds with water molecules, preventing water molecule penetration, thereby significantly improving the water resistance of the tile backing adhesive. In addition, the use of reactive emulsifiers reduces the impact of emulsifiers on water resistance, while the cross-linking structure in the acrylate emulsion and the synergistic effect between the monomers further enhance the film's density and water resistance.

[0030] (3) The present invention also improves the hardness and wear resistance of the emulsion film by adding styrene monomer, enabling it to resist physical wear from the external environment. At the same time, the introduction of 3-methacryloyloxypropyltrimethoxysilane endows the emulsion with excellent weather resistance, effectively resisting the erosion of natural factors such as ultraviolet rays and temperature changes, and preventing the emulsion from aging and deteriorating in performance.

[0031] (4) The tile back adhesive prepared by the present invention has good construction performance and moderate drying time, which can be dried in 2 to 4 hours, making it convenient for construction personnel to adjust and lay the tiles during the construction process.

[0032] (5) All raw materials used in this invention meet environmental protection standards and do not contain harmful substances such as formaldehyde and benzene. The production process follows green chemistry principles, reducing pollutant emissions. The product has been tested by authoritative institutions, and all environmental indicators meet national standards. It will not cause pollution to the indoor environment during construction and use, thus protecting human health. Detailed Implementation

[0033] The present invention is further illustrated below by way of examples, but these examples do not limit the invention to the scope of the embodiments described. Experimental methods in the following examples, unless otherwise specified, were performed according to conventional methods and conditions, or as selected in the product instructions. Furthermore, all reagents and raw materials used in this invention are commercially available.

[0034] Example 1

[0035] A method for preparing an interface agent that can improve the adhesive strength of ceramic tiles includes the following steps:

[0036] (1) Add 58 parts deionized water, 50 parts butyl acrylate, 30 parts styrene, 3.5 parts methacrylic acid, 4.5 parts hydroxyethyl acrylate, 1.2 parts 3-methacryloyloxypropyltrimethoxysilane, 1.2 parts allyloxyisomeric alcohol ether sulfate ammonium salt, and 1.2 parts 2-acrylamide-2-methylpropanesulfonic acid to an emulsification tank, stir and emulsify to prepare an emulsion;

[0037] (2) Dissolve 1 part of potassium persulfate in 7 parts of deionized water to prepare an initiator solution;

[0038] (3) Add 25 parts of deionized water to the reactor, heat to 85°C, add 15% emulsion, and then add 25% initiator solution to start the polymerization reaction;

[0039] (4) After 25 minutes, start adding the remaining emulsion and initiator solution dropwise into the reactor over a period of 3 hours. After the addition is complete, keep the reactor warm for 1.5 hours, cool it down, add 0.2 parts of 10% sodium hydroxide solution, neutralize it, and then filter it.

[0040] Example 2

[0041] A method for preparing an interface agent that can improve the adhesive strength of ceramic tiles includes the following steps:

[0042] (1) Add 55 parts deionized water, 30 parts butyl acrylate, 10 parts 2-ethylhexyl acrylate, 20 parts styrene, 2.2 parts methacrylic acid, 4 parts hydroxyethyl acrylate, 0.7 parts 3-methacryloyloxypropyltrimethoxysilane, 1 part allyloxyisomeric alcohol ether sulfate ammonium salt, and 1 part 2-acrylamide-2-methylpropanesulfonic acid to an emulsification kettle, stir and emulsify to prepare an emulsion;

[0043] (2) Dissolve 0.8 parts of potassium persulfate in 6 parts of deionized water to prepare an initiator solution;

[0044] (3) Add 20 parts of deionized water to the reactor, heat to 86°C, add 15% emulsion, and then add 25% initiator solution to start the polymerization reaction.

[0045] (4) After 15 minutes, start adding the remaining emulsion and initiator solution dropwise into the reactor over a period of 4 hours. After the addition is complete, keep the reactor warm for 2 hours, cool it down, add 0.2 parts of 10% sodium hydroxide solution, neutralize it, and then filter it.

[0046] Example 3

[0047] A method for preparing an interface agent that can improve the adhesive strength of ceramic tiles includes the following steps:

[0048] (1) Add 62 parts deionized water, 60 parts butyl acrylate, 35 parts styrene, 4 parts methacrylic acid, 5 parts hydroxyethyl acrylate, 2 parts 3-methacryloyloxypropyltrimethoxysilane, 2 parts allyloxyisomeric alcohol ether sulfate ammonium salt, and 2 parts 2-acrylamide-2-methylpropanesulfonic acid to an emulsification kettle, stir and emulsify to prepare an emulsion;

[0049] (2) Dissolve 1.5 parts of potassium persulfate in 8 parts of deionized water to prepare an initiator solution;

[0050] (3) Add 30 parts of deionized water to the reactor, heat to 82°C, add 15% emulsion, and then add 25% initiator solution to start the polymerization reaction.

[0051] (4) After 30 minutes, start adding the remaining emulsion and initiator solution dropwise into the reactor over a period of 3 hours. After the addition is complete, keep the reactor warm for 1 hour, cool it down, add 0.3 parts of 10% sodium hydroxide solution, neutralize it, and then filter it.

[0052] The present invention also provides the following comparative examples.

[0053] Comparative Example 1

[0054] The difference from Example 1 is only that in step (1), 1.2 parts of allyloxyisomeric alcohol ether sulfate ammonium salt and 1.2 parts of 2-acrylamide-2-methylpropanesulfonic acid are replaced with 2.4 parts of sodium dodecylbenzenesulfonate.

[0055] Comparative Example 2

[0056] The only difference from Example 1 is that 3-methacryloyloxypropyltrimethoxysilane is not added in step (1).

[0057] Comparative Example 3

[0058] The difference from Example 1 is only that: in step (1), 2-acrylamide-2-methylpropanesulfonic acid is not added, and the amount of allyloxyisomeric alcohol ether sulfate ammonium salt is 2.4 parts.

[0059] After synthesis in Comparative Example 3, 40 parts of gel were obtained, which did not meet the production requirements.

[0060] Comparative Example 4

[0061] Commercially available product: Baolijia Company's BLJ-6101.

[0062] Effect Example

[0063] The interface agents prepared in Examples 1-3 and Comparative Examples 1-4 were applied to the tile construction process as follows: During construction, the back of the tile was first cleaned to remove dust, oil, and other impurities, ensuring the tile surface was clean and dry. Then, a special scraper or brush was used to evenly apply the interface agent to the back of the tile, at a dosage of approximately 5-30 g / m². 2 Afterward, allow it to air dry in a cool, well-ventilated place, generally for 2-4 hours. Then, apply tile adhesive to the substrate surface, controlling the thickness to 0.5-1mm. After application, wait for the adhesive to surface dry, which generally takes 1-2 hours. Once the tile adhesive is surface dry, you can lay the tiles on the substrate, gently tapping them with a rubber mallet to ensure full adhesion between the tiles and the substrate, and to ensure the tiles are flat and vertical.

[0064] Application performance tests were conducted on the above embodiments and comparative examples, and the test methods selected are as follows:

[0065] I. Bond Strength Test: The test was conducted according to the JC / T547-2017 standard "Ceramic Tile Adhesives". The tiles were laid on a cement mortar base. After 7 days of curing, a tensile bond strength test was performed.

[0066] 2. Water resistance test: Immerse the laid tile specimens in water for 7 days, remove them, wipe off the surface moisture, and then conduct a tensile bond strength test again.

[0067] III. Weather Resistance Test: The ceramic tile specimens were subjected to accelerated aging tests using a xenon lamp aging chamber for 1000 hours. After aging, the surface of the ceramic tiles was observed, and tensile bond strength tests were performed again.

[0068] IV. Environmental Testing: Samples were sent to a professional environmental testing agency for testing in accordance with GB 18582-2020. The test results for samples from Examples 1-3 and Comparative Examples 1-4 showed that the formaldehyde content was less than 10 mg / kg and the total benzene content was less than 30 mg / kg, which meets the environmental protection standards for water-based wall coatings.

[0069] The test results are shown in the table below:

[0070]

[0071] The comparative examples show that reactive emulsifiers can significantly improve water resistance, while silane coupling agents can significantly improve both water resistance and weather resistance.

[0072] As can be seen from the above embodiments, the acrylic emulsion for interface agents of the present invention exhibits excellent performance in terms of bonding strength, water resistance, weather resistance, and environmental protection, and has significant economic and social benefits. It can be widely used in tile laying projects in the field of building decoration.

[0073] Finally, it should be noted that in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0074] Although this disclosure has been described above through specific embodiments, it should be understood that those skilled in the art can devise various modifications, improvements, or equivalents to this disclosure within the spirit and scope of the appended solutions. Such modifications, improvements, or equivalents should also be considered to be included within the scope of protection claimed in this disclosure.

Claims

1. An interface agent that can improve the bonding strength of ceramic tiles, characterized in that, It consists of the following components in parts by weight: 80-100 parts deionized water, 40-60 parts acrylate, 20-40 parts styrene, 2-5 parts methacrylic acid, 3-6 parts hydroxyethyl acrylate, 0.5-2 parts 3-methacryloyloxypropyltrimethoxysilane, 0.5-2 parts allyloxyisomeric alcohol ether sulfate ammonium salt, 0.5-2 parts 2-acrylamide-2-methylpropanesulfonic acid, 0.5-1.5 parts potassium persulfate, and 0.1-0.3 parts 10% sodium hydroxide solution.

2. The interface agent for improving the bonding strength of tiles according to claim 1, characterized in that, The acrylate is butyl acrylate and / or 2-ethylhexyl acrylate.

3. The method for preparing the interface agent for improving the adhesive strength of ceramic tiles according to any one of claims 1 to 2, characterized in that, Includes the following steps: (1) Add some deionized water, acrylate, styrene, methacrylic acid, hydroxyethyl acrylate, 3-methacryloyloxypropyltrimethoxysilane, allyloxyisomeric alcohol ether sulfate ammonium salt, and 2-acrylamide-2-methylpropanesulfonic acid to an emulsification kettle, stir and emulsify to prepare an emulsion. (2) Dissolve potassium persulfate in part of deionized water to prepare an initiator solution; (3) Add some deionized water to the reactor and heat it to 80-88°C. Add 15% of the emulsion and then add 25% of the initiator solution to start the polymerization reaction. (4) After 15 to 30 minutes, the remaining emulsion and the remaining initiator solution are added dropwise to the reaction vessel for 3 to 4 hours. After the addition is completed, the mixture is kept warm for 1 to 2 hours, cooled down, neutralized with 10% sodium hydroxide solution, filtered, and the interface agent is obtained.

4. The method for preparing the interface agent that can improve the bonding strength of tiles according to claim 3, characterized in that, In step (1), the weight of the deionized water is 55 to 62 parts.

5. The method for preparing the interface agent that can improve the bonding strength of tiles according to claim 3, characterized in that, In step (2), the weight of the deionized water is 5 to 8 parts.

6. The method for preparing the interface agent that can improve the bonding strength of tiles according to claim 3, characterized in that, In step (3), the weight of the deionized water is 20 to 30 parts.

7. The application of an interface agent for improving tile adhesion strength as described in claims 1-2, or an interface agent for improving tile adhesion strength prepared by the preparation method of the interface agent for improving tile adhesion strength as described in claims 3-6, in the field of building decoration.

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