Coal gasification slag reinforced alkali-activated environment-friendly ceramic tile adhesive and preparation method thereof

Abstract

The present application relates to the technical field of building materials, and particularly relates to a coal gasification slag reinforced alkali-activated environment-friendly ceramic tile adhesive and a preparation method thereof.The present application provides a coal gasification slag reinforced alkali-activated environment-friendly ceramic tile adhesive, which comprises, in terms of mass fractions, 30-50 parts of active silicate powder, 5-10 parts of a reinforcing agent, 0.1-0.3 parts of a water reducing agent, 0.03-0.05 parts of a smoothing agent, 5-10 parts of stone powder, 0.09-0.15 parts of cellulose, 3-5 parts of glue powder, 60-100 parts of fine aggregate and 10-20 parts of an activator; wherein the reinforcing agent is modified coal gasification slag powder.The environment-friendly ceramic tile adhesive uses alkali-activated materials to replace cement, is green and environment-friendly, has the advantages of fast setting, fast hardening, high early strength, smooth construction and labor saving, and has excellent bonding strength in different scenarios.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive and a preparation method thereof. Background Art

[0002] Alkali-activated materials have received widespread attention as a green and environmentally friendly cementitious material, and many new technologies and products related to alkali-activated materials have emerged. The raw materials for the preparation of alkali-activated materials mainly include industrial solid wastes with potential pozzolanic activity, such as mineral powder and fly ash. When combined with alkali activators, a cementitious material with compressive strength comparable to that of cement, high early strength, and better corrosion resistance can be obtained. However, compared with traditional cement, as a new type of material, if alkali-activated materials are to completely replace cement as a structural material, whether they meet the requirements in terms of safety and durability remains to be verified. Moreover, alkali-activated materials are often accompanied by problems such as efflorescence, shrinkage cracking, and high brittleness during their application, which limits their application.

[0003] Tile adhesive, a specialty mortar, requires a large amount of cement during its preparation. Furthermore, to ensure the mortar possesses good plasticity and bonding properties, it also requires the addition of a variety of organic admixtures that simultaneously retain water and increase viscosity. This results in high costs and leaves room for improvement in the material's early strength. Consequently, research has begun on how to use alkali-activated materials to prepare tile adhesives, thereby reducing cement usage and material costs.

[0004] However, when using alkali-activated materials to prepare tile adhesives, although organic admixtures can still be added and their water-retention and viscosity-increasing effects can be used to improve the problems of alkali-activated materials such as efflorescence, shrinkage cracking, and brittleness, tile adhesives prepared by simply replacing cement with alkali-activated materials still have the problems of efflorescence, shrinkage cracking, and brittleness inherent in the alkali-activated materials themselves. In addition, conventional adhesive powders are easily ineffective in a strong alkaline environment or after being immersed in water, and thus cannot play a role in enhancing the bonding strength, resulting in the adhesive being unable to meet the performance requirements of tile adhesives. In addition, when alkali-activated materials are used instead of cement, in order to ensure the strength of the material, a large amount of water glass is often needed as an activator to improve the strength of the alkali-activated material, resulting in increased production costs. Summary of the Invention

[0005] In view of this, the present invention provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive and a preparation method thereof. The environmentally friendly tile adhesive uses an alkali-activated material instead of cement, and the alkali-activated material is used in combination with other specific additives, thereby solving the problems of alkali-activated materials being prone to efflorescence, shrinkage cracking, and high brittleness. The obtained adhesive has the advantages of fast setting and hardening and high early strength.

[0006] To solve the above technical problems, the present invention provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive, which comprises, in parts by mass: 30-50 parts of active silicate powder, 5-10 parts of a reinforcing agent, 0.1-0.3 parts of a water reducer, 0.03-0.05 parts of a smoothing agent, 5-10 parts of stone powder, 0.09-0.15 parts of cellulose, 3-5 parts of glue powder, 60-100 parts of fine aggregate, and 10-20 parts of an activator; wherein the reinforcing agent is modified coal gasification slag powder.

[0007] In the coal gasification slag reinforced alkali-activated environmentally friendly tile adhesive provided by the present invention, active silicate powder generates strength under the stimulation of the activator, thereby providing basic strength for the tile adhesive; modified coal gasification slag powder is used as a reinforcing agent, and the modified coal gasification slag powder can be better combined with organic materials such as glue powder and smoothing agent, thereby improving the strength and workability of the material, and can also improve the bonding strength of the alkali-activated material while ensuring low cost; the water reducer can reduce the water consumption of the tile adhesive; the smoothing agent can improve the smoothness of construction, making the construction process more convenient and labor-saving; the stone powder can improve the density of the tile adhesive, improve the smoothness of construction and increase the strength; the cellulose can play a role in water retention and plasticization; the glue powder can improve the bonding strength of the tile adhesive; the fine aggregate plays a role in the skeleton and filling in the tile adhesive; the activator can stimulate the activity of the active silicate powder, hydrate it and generate strength.

[0008] In combination with the first aspect, the modified coal gasification slag powder is prepared according to the following method: grinding the coal gasification slag powder to a specific surface area greater than 400m 2 / kg, soaking it with sodium hydroxide solution, washing the soaked coal gasification slag powder with ethanol and water in sequence, then adding the washed coal gasification slag powder into ethanol aqueous solution and stirring evenly, subsequently adding ethyl orthosilicate and stirring for surface modification, then performing solid-liquid separation, collecting the solid phase and drying to obtain the modified coal gasification slag powder.

[0009] Preferably, the modified coal gasification slag powder is prepared by the following method: grinding the coal gasification slag powder to a specific surface area greater than 400m 2 / kg, soaking it with sodium hydroxide solution, washing the soaked coal gasification slag powder with ethanol and water in sequence, then adding the washed coal gasification slag powder into a 30% ethanol aqueous solution in a mass volume ratio of 1:9-11, stirring evenly, then adding ethyl orthosilicate accounting for 1 / 10 of the volume of the ethanol aqueous solution, stirring for surface modification, and then performing solid-liquid separation, collecting the solid phase and drying to obtain the modified coal gasification slag powder.

[0010] More preferably, the concentration of the sodium hydroxide solution used is 15 wt %, and the soaking time is 25-35 minutes.

[0011] More preferably, after adding ethyl orthosilicate, stirring is carried out for 1-2 hours to perform surface modification.

[0012] The present invention adopts modified coal gasification slag powder as a reinforcing agent, which can significantly improve the flexural strength of alkali-activated materials, thereby solving the problems of easy shrinkage and cracking and high brittleness of alkali-activated cementitious materials. At the same time, the modified coal gasification slag powder can also participate in the alkali activation reaction, consume excess alkalinity in the system, and improve the compressive strength of the material.

[0013] In combination with the first aspect, the active silicate powder is selected from at least one of slag powder, yellow phosphorus slag powder and fly ash, and the specific surface area of ​​the active silicate powder is greater than 400m 2 / kg.

[0014] The main raw materials used in the present invention, slag powder, yellow phosphorus slag powder and fly ash, are all industrial solid wastes, thus avoiding the use of cement with high production costs. The invention is both economical and environmentally friendly, and the comprehensive performance of the obtained environmentally friendly tile adhesive meets the use requirements.

[0015] In combination with the first aspect, the water reducer is selected from at least one of a naphthalene-based water reducer and a lignin sulfonate water reducer, and the lubricant is selected from at least one of sodium lauryl sulfate powder and calcium stearate powder.

[0016] In combination with the first aspect, the stone powder is a powder mixed with heavy calcium powder and talcum powder in equal quantities.

[0017] Preferably, the particle size of the stone powder is less than 45 μm.

[0018] In combination with the first aspect, the cellulose is selected from at least one of hydroxypropyl methylcellulose, hydroxyethyl cellulose and carboxymethyl cellulose.

[0019] In combination with the first aspect, the gum powder is selected from at least one of guar gum and xanthan gum.

[0020] The coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive provided by the present invention does not use the types of glue powder commonly used in preparing tile adhesives (such as polyvinyl alcohol, redispersible latex powder, etc.). Instead, it uses plant glue powders with excellent alkali resistance - guar gum and / or xanthan gum. This type of glue powder can still exert its adhesive effect even in alkali-activated materials with strong alkalinity, solving the problem that conventional glue powders are easily ineffective in strong alkaline environments and thus cannot play the role of enhancing bonding strength.

[0021] In combination with the first aspect, the fine aggregate is selected from at least one of quartz sand, dried river sand and tailings sand, and the fineness of the fine aggregate is 30-80 mesh.

[0022] In combination with the first aspect, the activator is obtained by mixing red mud, calcium hydroxide and instant sodium silicate in a mass ratio of 1:2:1.

[0023] Preferably, the fineness of the activator is 400-600 mesh.

[0024] In order to avoid the efflorescence phenomenon of alkali-activated materials, the present invention does not select water glass and sodium hydroxide commonly used in alkali-activated materials as activators, but instead selects a composite activator prepared from red mud, calcium hydroxide and instant sodium silicate, which have certain alkalinity but slow hydroxide dissolution. This activator can not only provide sufficient alkalinity for the alkali-activated material to promote its reaction, but also effectively avoid the occurrence of efflorescence; moreover, the activator also includes a certain amount of red mud, which provides direction for the resource utilization of solid waste material red mud, while greatly reducing the amount of water glass used and significantly reducing production costs.

[0025] Preferably, red mud, calcium hydroxide and instant sodium silicate are mixed in a mass ratio of 1:2:1, and then ground in a ball mill for at least 20 minutes to obtain the product.

[0026] The present invention also provides a method for preparing the above-mentioned coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, specifically comprising: uniformly mixing active silicate powder, a reinforcing agent, a water reducer, a smoothing agent, stone powder, cellulose, rubber powder, fine aggregate and an activator in proportion, then mixing and stirring with water to obtain the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive.

[0027] Preferably, the components are mixed in proportion, added to 17.5-30 parts of water, stirred evenly, and allowed to stand for 3-5 minutes to obtain the product.

[0028] The gasification slag enhanced alkali-activated environmentally friendly tile adhesive provided by the present invention has the following advantages: (1) It is green and environmentally friendly. The main raw material used in the environmentally friendly tile adhesive is industrial solid waste, which avoids the high-cost calcination process in cement production and is a green and environmentally friendly material; (2) The environmentally friendly tile adhesive has the characteristics of fast setting and hardening and high early strength, which reduces the problems of falling off and slipping that are prone to occur in the early stage of tile laying; (3) Smoothing agent and stone powder are added to the environmentally friendly tile adhesive. By adjusting the material ratio and preparing the smoothing agent for the alkali-activated material, it does not affect the material strength and can make the construction smoother and more labor-saving; (4) The environmentally friendly tile adhesive obtained by the present invention is completely made of environmentally friendly materials, the production cost is greatly reduced, and it has a water immersion tensile bonding strength, heat aging tensile bonding strength or freeze-thaw cycle tensile bonding strength that is equivalent to or even better than that of the tile adhesive made from cement, and has great economic value and practical value. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] In view of the problems of alkali activation material replacing cement still existing in the ceramic tile adhesive, such as alkali effusion, easy dry shrinkage cracking and large brittleness, and the problems of the used glue powder in the alkali environment, such as easy failure and resulting in the ceramic tile bonding not firm, the present application provides a coal gasification slag reinforced alkali activated environment-friendly ceramic tile adhesive and a preparation method thereof, the environment-friendly ceramic tile adhesive replaces cement with alkali activated material, and simultaneously adds a reinforcing agent, a self-made new composite activator and plant glue powder and other auxiliary materials, solves the problems of easy alkali effusion, dry shrinkage cracking and large brittleness of the alkali activated material, and the obtained adhesive has the advantages of fast setting, fast hardening and high early strength, simultaneously avoids the use of a large amount of high-cost water glass, and greatly reduces the production cost.

[0031] The raw and auxiliary materials and reagents used in the following examples and comparative examples are all commercially available industrial products, and the instruments used for preparation or testing are also all commonly used instruments in the industry.

[0032] Example 1

[0033] The present embodiment provides a coal gasification slag reinforced alkali activated environment-friendly ceramic tile adhesive, and the specific raw material composition and ratio are shown in Table 1:

[0034] Table 1

[0035]

[0036]

[0037] The activator used is obtained by mixing red mud, calcium hydroxide and instant sodium silicate in a mass ratio of 1:2:1 and then mixing and grinding by a ball mill; the modified coal gasification slag powder is prepared by the following method: grinding the coal gasification slag powder to a specific surface area greater than 400 m 2 / kg, soaking in a 15wt% sodium hydroxide solution for 30 minutes, washing the soaked coal gasification slag powder with ethanol and water, respectively, adding the washed coal gasification slag powder to a 30% ethanol aqueous solution in a mass-volume ratio of 1:10, stirring uniformly, then adding tetraethyl orthosilicate accounting for 1 / 10 of the volume of the ethanol aqueous solution, stirring for 1h for surface modification, and then performing solid-liquid separation, collecting the solid phase and drying to obtain the modified coal gasification slag powder.

[0038] The preparation method of the coal gasification slag reinforced alkali activated environment-friendly ceramic tile adhesive is as follows:

[0039] The active silicate powder, reinforcing agent, water reducing agent, smoothing agent, stone powder, cellulose, glue powder, fine aggregate and activator are mixed and stirred uniformly in the proportions in Table 1 to obtain a ceramic tile adhesive powder, the ceramic tile adhesive powder is added to 25 parts of water and stirred uniformly, and then left to stand for 4 minutes to obtain the ceramic tile adhesive.

[0040] Example 2

[0041] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 2:

[0042] Table 2

[0043]

[0044]

[0045] The preparation method of the stimulant used is the same as that of the stimulant in Example 1; the modified coal gasification slag powder used is prepared according to the following method: the coal gasification slag powder is ground to a specific surface area greater than 400m 2 / kg, soaked in 15wt% sodium hydroxide solution for 35 minutes, washed thoroughly with ethanol and water in turn, then added the washed coal gasification slag powder into 30% ethanol aqueous solution in a mass volume ratio of 1:9, stirred evenly, then added with ethyl orthosilicate accounting for 1 / 10 of the volume of the ethanol aqueous solution, stirred for 1.5h for surface modification, and then subjected to solid-liquid separation, the solid phase was collected and dried to obtain the modified coal gasification slag powder.

[0046] The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is as follows:

[0047] Active silicate powder, reinforcing agent, water reducing agent, smoothing agent, stone powder, cellulose, glue powder, fine aggregate and activator are mixed and stirred in the proportions in Table 1 to obtain tile adhesive powder. The tile adhesive powder is added to 18 parts of water and stirred evenly. The mixture is allowed to stand for 5 minutes.

[0048] Example 3

[0049] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 3:

[0050] Table 3

[0051]

[0052] The preparation method of the stimulant used is the same as that of the stimulant in Example 1; the modified coal gasification slag powder used is prepared according to the following method: the coal gasification slag powder is ground to a specific surface area greater than 400m 2 / kg, soaked in 15wt% sodium hydroxide solution for 25 minutes, washed thoroughly with ethanol and water in turn, then added the washed coal gasification slag powder into 30% ethanol aqueous solution at a mass volume ratio of 1:11, stirred evenly, then added with ethyl orthosilicate accounting for 1 / 10 of the volume of the ethanol aqueous solution, stirred for 2h for surface modification, and then subjected to solid-liquid separation, the solid phase was collected and dried to obtain modified coal gasification slag powder.

[0053] The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is as follows:

[0054] Active silicate powder, reinforcing agent, water reducing agent, smoothing agent, stone powder, cellulose, glue powder, fine aggregate and activator are mixed and stirred in the proportions in Table 1 to obtain tile adhesive powder. The tile adhesive powder is added to 30 parts of water and stirred evenly, and then allowed to stand for 3 minutes.

[0055] Example 4

[0056] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 4:

[0057] Table 4

[0058]

[0059] The preparation method of the stimulant used is the same as that of the stimulant in Example 1; the modified coal gasification slag powder used is prepared according to the following method: the coal gasification slag powder is ground to a specific surface area greater than 400m 2 / kg, soaked in 15wt% sodium hydroxide solution for 30 minutes, washed thoroughly with ethanol and water in turn, then added the washed coal gasification slag powder into 30% ethanol aqueous solution in a mass volume ratio of 1:10, stirred evenly, then added with ethyl orthosilicate accounting for 1 / 10 of the volume of the ethanol aqueous solution, stirred for 2h for surface modification, and then subjected to solid-liquid separation, the solid phase was collected and dried to obtain modified coal gasification slag powder.

[0060] The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is as follows:

[0061] Active silicate powder, reinforcing agent, water reducing agent, smoothing agent, stone powder, cellulose, glue powder, fine aggregate and activator are mixed and stirred in the proportions in Table 1 to obtain tile adhesive powder. The tile adhesive powder is added to 25 parts of water and stirred evenly, and then allowed to stand for 4 minutes.

[0062] Example 5

[0063] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 5:

[0064] Table 5

[0065]

[0066] The preparation methods of the activator and modified coal gasification slag powder are the same as those in Example 1. The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is the same as that in Example 1.

[0067] Example 6

[0068] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 6:

[0069] Table 6

[0070]

[0071]

[0072] The preparation methods of the activator and modified coal gasification slag powder are the same as those in Example 1. The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is the same as that in Example 1.

[0073] Example 7

[0074] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 7:

[0075] Table 7

[0076]

[0077] The preparation methods of the activator and modified coal gasification slag powder are the same as those in Example 1. The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is the same as that in Example 1.

[0078] Example 8

[0079] This embodiment provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, the specific raw material composition and proportion of which are shown in Table 8:

[0080] Table 8

[0081]

[0082] The preparation methods of the activator and modified coal gasification slag powder are the same as those in Example 1. The preparation method of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive is the same as that in Example 1.

[0083] Comparative Example 1

[0084] This comparative example provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that an equal amount of 42.5 ordinary Portland cement is used instead of the active silicate powder. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0085] Comparative Example 2

[0086] This comparative example provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that no reinforcing agent is added. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0087] Comparative Example 3

[0088] This comparative example provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that the reinforcing agent is an equal amount of unmodified coal gasification slag powder. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0089] Comparative Example 4

[0090] This comparative example provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that the type of reinforcing agent is different: this comparative example uses calcium carbonate powder instead of coal gasification slag powder and is modified according to the method of Example 1 to obtain modified calcium carbonate powder. The remaining materials and adhesive preparation methods are the same as those in Example 1.

[0091] Comparative Example 5

[0092] This comparative example provides a coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that no activator is added. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0093] Comparative Example 6

[0094] This comparative example provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that the activator used does not contain red mud, that is, the red mud is replaced by an equal amount of calcium hydroxide. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0095] Comparative Example 7

[0096] This comparative example provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that the adhesive powder used is vinyl acetate homopolymer adhesive powder. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0097] Comparative Example 8

[0098] This comparative example provides a coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive. Its raw material formula is similar to that of Example 1, except that the activator used is water glass with a modulus of 2.0 and a Baume degree of 50 degrees. The remaining materials and the preparation method of the adhesive are the same as those in Example 1.

[0099] Test Example

[0100] The performance tests of the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesives obtained in Examples 1 to 8 and Comparative Examples 1 to 8 were respectively carried out. The tensile bonding strength under different scenarios was tested according to the standard "Ceramic Tile Adhesives" (JC / T 547-2017). The test results are shown in Table 9.

[0101] Table 9

[0102]

[0103]

[0104] The test results of Examples 1-8 in Table 9 demonstrate that the coal gasification slag-enhanced alkali-activated environmentally friendly tile adhesive provided by the present invention exhibits high early strength and excellent bonding strength in various scenarios, meeting the performance requirements of tile adhesives. Furthermore, compared to Example 1, the tile adhesive prepared using the alkali-activated material prepared with activated silicate powder in Comparative Example 1 exhibits superior bonding strength compared to the adhesive prepared using ordinary Portland cement at the same admixture dosage. This demonstrates that selecting the appropriate activated silicate powder significantly impacts the performance of modified coal gasification slag powder-enhanced alkali-activated tile adhesives. This also indirectly demonstrates that the combination of the reinforcing agent (modified coal gasification slag powder) provided by the present invention with specific activated silicate powders can produce a tile adhesive with superior performance. The results of Comparative Example 2 demonstrate that the addition of modified coal gasification slag powder significantly improves the bonding performance of tile adhesives prepared with alkali-activated materials, effectively enhancing the bonding strength of tile adhesives prepared with alkali-activated materials. The results of Comparative Example 3 show that modified coal gasification slag powder can better bond with other organic components in tile adhesives, thereby improving the adhesive's bond strength. The results of Comparative Example 4 show that tile adhesive prepared by replacing coal gasification slag powder with calcium carbonate and modifying it does not effectively enhance the adhesive's bond strength. The results of Comparative Example 5 show that the activity of the active silicate component in the alkali-activated material depends on the activation of the alkali activator. When no activator is added, the resulting tile adhesive exhibits a significant decrease in bond strength, compressive strength, and flexural strength, accompanied by cracking. The results of Comparative Example 6 show that when the composite activator formula is modified (by removing red mud), the resulting tile adhesive exhibits a decrease in bond strength, compressive strength, and flexural strength, accompanied by slight efflorescence. The results of Comparative Example 7 show that when the glue powder used in the present invention is replaced with a vinyl acetate homopolymer glue powder instead of the more alkali-resistant plant glue powder, the bonding strengths of the different materials decrease to varying degrees, and cracks are generated, indicating that the plant glue powder is more suitable for this system. The results of Comparative Example 8 show that when the composite activator in the present invention is replaced with the commonly used water glass, the compressive strength of the resulting tile adhesive increases, but the bonding strength decreases significantly, and efflorescence and cracking are obvious, indicating that the composite activator used in the present invention can effectively improve the efflorescence and cracking of alkali-activated materials.

[0105] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive, characterized in that: According to the mass ratio, it includes: 30-50 parts of active silicate powder, 5-10 parts of reinforcing agent, 0.1-0.3 parts of water reducing agent, 0.03-0.05 parts of smoothing agent, 5-10 parts of stone powder, 0.09-0.15 parts of cellulose, 3-5 parts of rubber powder, 60-100 parts of fine aggregate, and 10-20 parts of activator; The reinforcing agent is modified coal gasification slag powder, which is prepared by the following method: grinding the coal gasification slag powder to a specific surface area greater than 400 m 2 / kg, soaking it in a sodium hydroxide solution, washing the soaked coal gasification slag powder with ethanol and water in sequence, then adding the washed coal gasification slag powder into an ethanol aqueous solution and stirring evenly, subsequently adding ethyl orthosilicate and stirring for surface modification, then performing solid-liquid separation, collecting the solid phase and drying to obtain the modified coal gasification slag powder; the active silicate powder is selected from at least one of slag powder, yellow phosphorus slag powder and fly ash, the gum powder is selected from at least one of guar gum and xanthan gum, and the activator is obtained by mixing red mud, calcium hydroxide and instant sodium silicate in a mass ratio of 1:2:

1.

2. The coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive according to claim 1, characterized in that: The specific surface area of ​​the active silicate powder is greater than 400m 2 / kg.

3. The coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive according to claim 1, characterized in that: The water reducer is selected from at least one of a naphthalene-based water reducer and a lignin sulfonate water reducer, and the lubricant is selected from at least one of a sodium lauryl sulfate powder and a calcium stearate powder.

4. The coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive according to claim 1, characterized in that: The stone powder is a powder obtained by mixing heavy calcium powder and talcum powder in equal amounts.

5. The coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive according to claim 1, characterized in that: The cellulose is selected from at least one of hydroxypropyl methylcellulose, hydroxyethyl cellulose and carboxymethyl cellulose.

6. The coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive according to claim 1, characterized in that: The fine aggregate is selected from at least one of quartz sand, dried river sand and tailings sand, and the fineness of the fine aggregate is 30-80 mesh.

7. The method for preparing the coal gasification slag enhanced alkali-activated environmentally friendly tile adhesive according to any one of claims 1 to 6, characterized in that: Active silicate powder, reinforcing agent, water reducing agent, smoothing agent, stone powder, cellulose, rubber powder, fine aggregate and activator are mixed evenly in proportion, then mixed with water and stirred evenly to obtain the coal gasification slag reinforced alkali-activated environmentally friendly tile adhesive.

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