Decarburized coal gangue-based adhesive and preparation method thereof

Abstract

The invention discloses a decarburized coal gangue-based adhesive and a preparation method thereof, and belongs to the technical field of solid waste comprehensive utilization and building material production, the decarburized coal gangue-based adhesive comprises the following raw materials by mass: 20-35 parts of coal gangue-based full-solid waste cement, 66-78 parts of compound powder, 1-4 parts of latex powder, 1-2 parts of a reinforcing agent and 1-2 parts of a fiber material; the expanded graphite powder and the decarburized coal gangue with different granularities are mixed and graded, so that the bonding strength of the adhesive is enhanced, the expanded graphite is expanded when encountering water during use, cracks can be dynamically repaired, a water seepage channel can be dynamically blocked, and the compactness and the water resistance of the adhesive are improved; the silane-terminated polyurethane prepolymer is doped into the latex powder, after the latex powder is compounded with the vinyl acetate-ethylene copolymer, a rigid silicate network and flexible polymer interpenetrating structure can be formed by the latex powder, the coal gangue-based all-solid waste cement and other components, the buffer capacity of the expanded graphite powder is combined, and the anti-seismic deformation requirement of large-plate ceramic tiles is met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive utilization of solid waste and production of building materials, and particularly relates to a decarbonized coal gangue-based adhesive and a preparation method thereof. BACKGROUND

[0002] Coal gangue is a main associated solid product generated in the process of coal mining and washing, and its inorganic mineral matrix mainly contains carbonaceous shale, mudstone, sandstone and the like, and usually contains a small amount of residual coal and sulfur compounds. As the largest industrial solid waste category in the world, its long-term open-air storage poses multiple pressures on the ecological environment: large-area storage yard occupies land space; the sulfur components and trace heavy metals pose a risk of polluting the surrounding water and soil environment under the action of rainfall leaching; the internal residual coal is prone to spontaneous combustion, releasing harmful gases such as sulfur oxides and carbon oxides; the loose and large-scale accumulation body is a potential hidden danger source of inducing slope instability and mudslides and the like.

[0003] On the contrary, coal gangue is regarded as a "misplaced resource" that needs to be revitalized. Through efficient resource utilization, significant value can be created in the fields of power, building materials, chemical industry, environmental protection and the like. Specific coal gangue varieties (such as clay) are rich in more than 70% of silicon aluminum oxides, which can be used as silicon aluminum substitutes to replace raw materials in the production of traditional Portland cement clinker. At the same time, the internal residual carbon component (heat value of about 800-2000 kcal / kg) can provide part of the heat energy in the kiln calcination process, reducing the consumption of fossil fuels and achieving the dual goals of energy consumption optimization and economic improvement in the production process.

[0004] Ceramic tile adhesive is a high-performance composite material based on cement-based materials, which is prepared by compounding various functional additives and is specially used for the bonding system of ceramic tile paving. Its technology is rooted in the inherent defects exposed when traditional cement mortar is used for ceramic tile paving, mainly including low bonding strength, easy occurrence of hollowing and later falling off and the like; at the same time, it also responds to the continuous improvement needs of modern building engineering for paving efficiency, environmental friendliness and final paving quality and durability. With the popular application of ready-mixed mortar process and the iterative upgrading of the building industry, such adhesive technology is increasingly improved and standardized, and has been widely applied to various building paving engineering.

[0005] In the prior art, ceramic tile adhesives taking coal gangue as the main raw material generally focus on the "high strength" index. However, with the widespread application of low water absorption large plate ceramic tiles (≥900x1800mm) and the increase of deformation substrates such as external wall insulation, flue, elevator shaft and the like, the traditional "high strength-rigid" adhesive exposes some new problems, especially poor shear deformation adaptability to large plate ceramic tiles. SUMMARY

[0006] The present application aims to provide a decarburized coal gangue-based adhesive and a preparation method thereof, wherein silane-terminated polyurethane prepolymer is mixed into component latex powder, and after being compounded with vinyl acetate-ethylene copolymer, it can form a "rigid silicate network + flexible polymer interpenetrating structure" with components such as coal gangue-based full-solid waste cement, and combined with the buffering capacity of expanded graphite powder, it is suitable for the anti-seismic deformation requirements of large plate ceramic tiles.

[0007] The object of the present application can be achieved by the following technical solutions: A decarburized coal gangue-based adhesive, including the following components in mass parts: 20-35 parts of coal gangue-based full-solid waste cement, 66-78 parts of compounded powder, 1-4 parts of latex powder, 1-2 parts of reinforcing agent, and 1-2 parts of fiber material.

[0008] Further, the coal gangue-based full-solid waste cement is a silicate cement produced by taking coal gangue, high-calcium tailings, and quartz tailings as raw materials.

[0009] Further, the coal gangue is clay coal gangue generated in the process of coal mining and washing, and its SiO2+Al2O3 is greater than 85wt%; the high-calcium tailings are limestone gangue minerals, and its CaO is greater than 45wt%; the quartz tailings are tailings with quartz as the main component generated in industrial production or ore dressing, and its SiO2 is greater than 90wt%.

[0010] Further, the compounded powder is obtained by crushing, screening, and grading the decarburized coal gangue and grading with expanded graphite powder, and specifically composed of 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue, and 150-800 mesh decarburized coal gangue, wherein the 50-100 mesh expanded graphite powder accounts for 1.5-2wt% of the compounded powder, and the 20-150 mesh decarburized coal gangue accounts for 15-25wt% of the compounded powder.

[0011] Further, the decarburized coal gangue is obtained by screening and homogenizing coal gangue raw materials with different calorific values and carbon contents, then conveying them to a kiln, and then preheating, calcining, and cooling.

[0012] Further, the latex powder is composed of synthetic resin powder, organic tin catalyst, and protective colloid, wherein the organic tin catalyst accounts for 0.025-0.05wt% of the latex powder, and the protective colloid accounts for 4-6wt% of the latex powder.

[0013] The synthetic resin powder is made by spray drying vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the silane-terminated polyurethane prepolymer accounts for 5-10wt% of the synthetic resin powder.

[0014] Further, the silane-terminated polyurethane prepolymer is obtained by end-capping the hydroxyl-terminated polyurethane prepolymer with isocyanate silane coupling agent.

[0015] Organotin catalysts include, but are not limited to, stannous octoate.

[0016] The protective colloid is one or more of polyvinyl alcohol, sodium polyacrylate, and polyethylene glycol in any mass ratio.

[0017] Further, the reinforcing agent is one or more of calcium chloride, sodium aluminate, sodium carbonate, sodium formate, triethanolamine, and calcium formate in any mass ratio.

[0018] Further, the fibrous material is one or more of wind turbine blade recycled fiber, hydroxypropyl methylcellulose, hydroxyethyl cellulose, polypropylene fiber, polyvinyl alcohol fiber, and glass fiber in any mass ratio.

[0019] The present application also provides a preparation method of a decarburized coal gangue-based adhesive, comprising the following steps: The coal gangue-based full-solid waste cement, the compounded powder, the latex powder, the water reducing agent, the reinforcing agent, and the fibrous material are added into a mixer, and mixed at a speed of 24 r / min for 15-25 min; after the mixing is completed, the discharging, inspection, metering, sealing, and packaging procedures are sequentially performed to obtain the decarburized coal gangue-based adhesive.

[0020] The present application has the following beneficial effects: 1. The main raw material used in the present application is mainly clayey coal gangue solid waste discharged in the coal mining process and the coal washing process, which belongs to an important technology for efficient, high-value, and large-scale utilization of mining solid waste; the portland cement used is made of materials such as coal gangue, high-calcium tailings, and quartz tailings through processes such as mixing, firing, and fine grinding, which greatly reduces the production cost of cement.

[0021] 2. The present application enhances the bonding strength of the adhesive by mixing and grading the expanded graphite powder and the decarburized coal gangue of different particle sizes; when used, the expanded graphite expands when it comes into contact with water, which can dynamically repair cracks, block water seepage channels, and improve the compactness and water resistance of the adhesive.

[0022] 3. The present application incorporates silane-terminated polyurethane prepolymers into the latex powder, which, after compounding with vinyl acetate-ethylene copolymers, can form a "rigid silicate network + flexible polymer interpenetrating structure" with components such as coal gangue-based full-solid waste cement, combined with the buffering capacity of expanded graphite powder, which meets the anti-seismic deformation requirements of large plate ceramic tiles. DETAILED DESCRIPTION

[0023] With reference to the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] Embodiment 1: This embodiment provides a decarburized coal gangue-based high-strength adhesive, which comprises the following raw materials in parts by mass: 35 parts of coal gangue-based full-solid waste cement, 78 parts of compound powder, 2 parts of latex powder, 1 part of reinforcing agent and 2 parts of fiber material.

[0025] The coal gangue-based full-solid waste cement is a portland cement produced by taking coal gangue, high-calcium tailings and quartz tailings as raw materials.

[0026] The coal gangue is clay coal gangue generated in the process of coal mining and washing, and SiO2+Al2O3>85wt%; the high-calcium tailings are limestone gangue minerals, and CaO>45wt%; the quartz tailings are tailings with quartz as the main component generated in industrial production or ore dressing, and SiO2>90wt%.

[0027] The compound powder is obtained by crushing, screening and grading the decarburized coal gangue and grading with expanded graphite powder, and specifically composed of 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue and 150-800 mesh decarburized coal gangue, wherein the 50-100 mesh expanded graphite powder accounts for 1.5wt% of the compound powder, and the 20-150 mesh decarburized coal gangue accounts for 15wt% of the compound powder.

[0028] The decarburized coal gangue is obtained by screening and homogenizing coal gangue raw materials with different calorific values and carbon contents, then conveying them to a kiln, and then preheating, calcining and cooling.

[0029] The latex powder is composed of synthetic resin powder, organic tin catalyst and protective colloid, wherein the organic tin catalyst accounts for 0.025wt% of the latex powder, and the protective colloid accounts for 4wt% of the latex powder.

[0030] The synthetic resin powder is made by spray drying of vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the silane-terminated polyurethane prepolymer accounts for 5wt% of the synthetic resin powder.

[0031] The silane-terminated polyurethane prepolymer is obtained by end-capping of hydroxyl-terminated polyurethane prepolymer with isocyanate silane coupling agent.

[0032] The preparation method of the decarburized coal gangue-based adhesive comprises the following steps: The coal gangue-based full-solid waste cement, the compound powder, the latex powder, the water reducing agent, the reinforcing agent and the fiber material are added into a mixer, and mixing is performed at a speed of 24 r / min for 15 min. After the mixing is completed, a discharging, inspection, metering, sealing and packaging procedure are sequentially performed to obtain the decarburized coal gangue-based adhesive.

[0033] In this embodiment, a decarburized coal gangue-based high-strength adhesive is provided, which comprises the following raw materials in parts by mass: 35 parts of coal gangue-based full-solid waste cement, 77 parts of compound powder, 3 parts of latex powder, 2 parts of reinforcing agent and 2 parts of fiber material.

[0034] The coal gangue-based full-solid waste cement is a silicate cement produced by taking coal gangue, high-calcium tailings and quartz tailings as raw materials.

[0035] The coal gangue is clay coal gangue produced in the process of coal mining and washing, and has a SiO2+Al2O3 content of more than 85 wt%. The high-calcium tailings are limestone gangue minerals, and have a CaO content of more than 45 wt%. The quartz tailings are tailings with quartz as the main component produced in industrial production or ore dressing, and have a SiO2 content of more than 90 wt%.

[0036] The compound powder is obtained by crushing, screening and grading the decarburized coal gangue and grading with expanded graphite powder, and is specifically composed of 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue and 150-800 mesh decarburized coal gangue. The 50-100 mesh expanded graphite powder accounts for 1.8 wt% of the compound powder, and the 20-150 mesh decarburized coal gangue accounts for 25 wt% of the compound powder.

[0037] The decarburized coal gangue is obtained by screening and homogenizing coal gangue raw materials with different calorific values and carbon contents, conveying them to a kiln, and then preheating, calcining and cooling.

[0038] The latex powder is composed of synthetic resin powder, organic tin catalyst and protective colloid, wherein the organic tin catalyst accounts for 0.03 wt% of the latex powder, and the protective colloid accounts for 4 wt% of the latex powder.

[0039] The synthetic resin powder is prepared by spray drying of vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the silane-terminated polyurethane prepolymer accounts for 6 wt% of the synthetic resin powder.

[0040] The silane-terminated polyurethane prepolymer is obtained by end-capping of a hydroxyl-terminated polyurethane prepolymer with an isocyanate silane coupling agent.

[0041] The preparation method of the decarburized coal gangue-based adhesive comprises the following steps: The coal gangue-based full-solid waste cement, the compound powder, the latex powder, the water reducing agent, the reinforcing agent and the fiber material are added into a mixer, and mixing is performed at a speed of 24 r / min for 25 min. After the mixing is completed, the discharging, inspection, metering, sealing and packaging procedures are sequentially performed to obtain the decarburized coal gangue-based adhesive.

[0042] In this embodiment, a decarburized coal gangue-based high-strength adhesive is provided, which comprises the following raw materials in parts by mass: 20 parts of coal gangue-based full-solid waste cement, 71 parts of compound powder, 4 parts of latex powder, 2 parts of reinforcing agent and 1 part of fiber material.

[0043] The coal gangue-based full-solid waste cement is a silicate cement produced by taking coal gangue, high-calcium tailings and quartz tailings as raw materials.

[0044] The coal gangue is clay coal gangue generated in the process of coal mining and washing, and the content of SiO2+Al2O3 is greater than 85wt%. The high-calcium tailings are limestone gangue minerals, and the content of CaO is greater than 45wt%. The quartz tailings are tailings with quartz as the main component generated in industrial production or ore dressing, and the content of SiO2 is greater than 90wt%.

[0045] The compound powder is obtained by crushing, screening and grading the decarburized coal gangue and grading with expanded graphite powder. Specifically, the compound powder is obtained by mixing 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue and 150-800 mesh decarburized coal gangue, wherein the content of 50-100 mesh expanded graphite powder is 2wt% of the compound powder, and the content of 20-150 mesh decarburized coal gangue is 20wt% of the compound powder.

[0046] The decarburized coal gangue is obtained by screening and homogenizing coal gangue raw materials with different calorific values and carbon contents, conveying them to a kiln, and then preheating, calcining and cooling.

[0047] The latex powder is composed of synthetic resin powder, organic tin catalyst and protective colloid, wherein the content of the organic tin catalyst is 0.04wt% of the latex powder, and the content of the protective colloid is 5wt% of the latex powder.

[0048] The synthetic resin powder is prepared by spray drying of vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the content of the silane-terminated polyurethane prepolymer is 8wt% of the synthetic resin powder.

[0049] The silane-terminated polyurethane prepolymer is obtained by end-capping of hydroxyl-terminated polyurethane prepolymer with isocyanate silane coupling agent.

[0050] The preparation method of the decarburized coal gangue-based adhesive comprises the following steps: The coal gangue-based full-solid waste cement, the compound powder, the latex powder, the water reducing agent, the reinforcing agent and the fiber material are added into a mixer, and mixing is performed at a speed of 24 r / min for 15 min. After the mixing is completed, the discharging, inspection, metering, sealing and packaging procedures are sequentially performed to obtain the decarburized coal gangue-based adhesive.

[0051] In this embodiment, a decarburized coal gangue-based high-strength adhesive is provided, which comprises the following raw materials in parts by mass: 25 parts of coal gangue-based full-solid waste cement, 66 parts of compound powder, 4 parts of latex powder, 1 part of reinforcing agent and 2 parts of fiber material.

[0052] The coal gangue-based full-solid waste cement is a silicate cement produced by taking coal gangue, high-calcium tailings and quartz tailings as raw materials.

[0053] The coal gangue is clay coal gangue generated in the process of coal mining and washing, and the content of SiO2+Al2O3 is greater than 85wt%. The high-calcium tailings are limestone gangue minerals, and the content of CaO is greater than 45wt%. The quartz tailings are tailings with quartz as the main component generated in industrial production or ore dressing, and the content of SiO2 is greater than 90wt%.

[0054] The compound powder is obtained by crushing, screening and grading the decarburized coal gangue and grading with expanded graphite powder. Specifically, the compound powder is obtained by mixing 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue and 150-800 mesh decarburized coal gangue, wherein the content of 50-100 mesh expanded graphite powder is 2wt% of the compound powder, and the content of 20-150 mesh decarburized coal gangue is 25wt% of the compound powder.

[0055] The decarburized coal gangue is obtained by screening and homogenizing coal gangue raw materials with different calorific values and carbon contents, conveying them to a kiln, and then preheating, calcining and cooling.

[0056] The latex powder is composed of synthetic resin powder, organic tin catalyst and protective colloid, wherein the content of the organic tin catalyst is 0.05wt% of the latex powder, and the content of the protective colloid is 6wt% of the latex powder.

[0057] The synthetic resin powder is prepared by spray drying of vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the content of the silane-terminated polyurethane prepolymer is 10wt% of the synthetic resin powder.

[0058] The silane-terminated polyurethane prepolymer is obtained by end-capping of hydroxyl-terminated polyurethane prepolymer with isocyanate silane coupling agent.

[0059] The preparation method of the decarburized coal gangue-based adhesive comprises the following steps: The coal gangue-based full-solid waste cement, the compound powder, the latex powder, the water reducing agent, the reinforcing agent and the fiber material are added into a mixer, and mixed at a speed of 24 r / min for 25 min. After the mixing is completed, the discharging, inspection, metering, sealing and packaging procedures are sequentially performed to obtain the decarburized coal gangue-based adhesive.

[0060] In this embodiment, a decarburized coal gangue-based high-strength adhesive is provided, which comprises the following raw materials in parts by mass: 25 parts of coal gangue-based full-solid waste cement, 69 parts of compound powder, 1 part of latex powder, 1.5 parts of reinforcing agent and 2 parts of fiber material.

[0061] The coal gangue-based full-solid waste cement is a silicate cement produced by taking coal gangue, high-calcium tailings and quartz tailings as raw materials.

[0062] The coal gangue is clay coal gangue produced in the process of coal mining and washing, and has a SiO2+Al2O3 content of more than 85 wt%. The high-calcium tailings are limestone gangue minerals, and have a CaO content of more than 45 wt%. The quartz tailings are tailings with quartz as the main component produced in industrial production or ore dressing, and have a SiO2 content of more than 90 wt%.

[0063] The compound powder is obtained by crushing, screening and grading the decarburized coal gangue and grading with expanded graphite powder, and is specifically composed of 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue and 150-800 mesh decarburized coal gangue. The 50-100 mesh expanded graphite powder accounts for 1.5 wt% of the compound powder, and the 20-150 mesh decarburized coal gangue accounts for 15 wt% of the compound powder.

[0064] The decarburized coal gangue is obtained by screening and homogenizing coal gangue raw materials with different calorific values and carbon contents, conveying them to a kiln, and then preheating, calcining and cooling.

[0065] The latex powder is composed of synthetic resin powder, organic tin catalyst and protective colloid, wherein the organic tin catalyst accounts for 0.04 wt% of the latex powder, and the protective colloid accounts for 5 wt% of the latex powder.

[0066] The synthetic resin powder is prepared by spray drying of vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the silane-terminated polyurethane prepolymer accounts for 8 wt% of the synthetic resin powder.

[0067] The silane-terminated polyurethane prepolymer is obtained by end-capping of a hydroxyl-terminated polyurethane prepolymer with an isocyanate silane coupling agent.

[0068] The preparation method of the decarburized coal gangue-based adhesive comprises the following steps: The coal gangue-based full-solid waste cement, the compound powder, the latex powder, the water reducing agent, the reinforcing agent and the fiber material are added into a mixer, and mixing is carried out at a speed of 24 r / min for 15 min; after the mixing is completed, the discharging, inspection, metering, sealing and packaging procedures are sequentially carried out to obtain the decarburized coal gangue-based adhesive.

[0069] In the above examples, the raw material of the terminal hydroxyl polyurethane prepolymer is obtained by reacting PPG8000 and IPDI (nNCO:nOH is 1:2) at 80℃ for 2.5h, and the isocyanate silane coupling agent is selected as KH901, which is continuously reacted with the above-mentioned terminal hydroxyl polyurethane prepolymer (nNCO:nOH is 1:1) at 80℃ for 2.5h to obtain the silane-terminated polyurethane prepolymer.

[0070] The organic tin catalyst includes but is not limited to stannous octoate, and the above examples specifically use stannous octoate.

[0071] The protective colloid is one or more of polyvinyl alcohol, sodium polyacrylate and polyethylene glycol in any mass ratio, and the above examples specifically use polyvinyl alcohol.

[0072] The reinforcing agent is one or more of calcium chloride, sodium aluminate, sodium carbonate, sodium formate, triethanolamine and calcium formate in any mass ratio, and the above examples specifically use calcium formate with a purity of 99.8%.

[0073] The fiber material is one or more of wind turbine blade recycled fiber, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, polypropylene fiber, polyvinyl alcohol fiber and glass fiber in any mass ratio, and the above examples specifically use hydroxypropyl methyl cellulose with a viscosity of 200000 mPa·s.

[0074] Comparative Example 1: Compared with Example 1, the compound powder is completely replaced by 20-150 mesh decarburized coal gangue, and the remaining steps remain unchanged.

[0075] Comparative Example 2: Compared with Example 2, the compound powder is completely replaced by 20-150 mesh decarburized coal gangue, and the remaining steps remain unchanged.

[0076] Comparative Example 3: Compared with Example 3, the synthetic resin powder in the latex powder is made by spray drying of vinyl acetate-ethylene copolymer, and no organic tin catalyst is added, and the remaining steps remain unchanged.

[0077] Comparative Example 4: Compared with Example 4, the compound powder is completely replaced by 20-150 mesh decarburized coal gangue, and the remaining steps remain unchanged.

[0078] Comparative Example 5: Compared with Example 5, no expanded graphite powder is added in the compound powder, and the remaining steps remain unchanged.

[0079] Performance test: The decarburized coal gangue-based adhesive samples of Example 1-Example 5, Comparative Example 1-Comparative Example 5 were respectively marked as Example 1-Example 5, Comparative Example 1-Comparative Example 5, and were tested as follows: The test method was JC / T 547-2017, and the test procedure was as follows: (1) The mixed material was added to a certain amount of water, and stirred in a cement mortar mixer at low speed for 30 s, the paddle was lifted, and the adhesive on the paddle and the inner wall of the pot was cleaned within 60 s, and then the paddle was put into the pot and stirred for 60 s.

[0080] (2) Stop stirring, mature for 15 min, and finally stir for 15 s.

[0081] (3) A straight-edged trowel was used to thinly spread a layer of adhesive on the concrete board, and the force was scraped and spread, then a thicker layer of adhesive was spread with a toothed trowel, and was combed with a 6mm x 6mm (center distance 12mm) toothed trowel. When holding the trowel, it should be at an angle of 60° to the concrete board, at a right angle to one side of the concrete board, and parallel to the edge of the concrete board (moving in a straight line).

[0082] (4) At the specified time, at least 10 test ceramic tiles (40 mm apart) were placed on the adhesive. For all adhesives, the ceramic tiles should be placed in 4 rows. On each tile, a pressure block of (2000±15) g was applied for 30 s.

[0083] (5) Cured for 28 d under standard test conditions.

[0084] The test data obtained are shown in Table 1: Table 1 Performance test results of various adhesives

[0085] As can be seen from Table 1, the tensile bonding strength of the decarburized coal gangue-based high-strength adhesive samples in Example 1-Example 5 is greater than that of the corresponding comparative examples. Comparative Examples 1-2 and 4 show that the compounded powders obtained by different particle size material gradation can enhance the bonding strength of the samples.

[0086] Comparative Example 3 shows that the resin powder compounded from vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer used in the latex powder can improve the bonding strength of the sample, because the silane-terminated polyurethane prepolymer is mixed in the latex powder, and after compounding with the vinyl acetate-ethylene copolymer, it can form a "rigid silicate network + flexible polymer interpenetrating structure" with the components of the coal gangue-based full solid waste cement.

[0087] The comparative example 5 shows that the doping of the expanded graphite powder helps to improve the bonding strength of the sample, because the expanded graphite powder and the different particle size decarburized coal gangue are mixed and graded, the bonding strength of the adhesive is enhanced, the expanded graphite expands when used, the cracks can be dynamically repaired, the water seepage channel is blocked, and the compactness and water resistance of the adhesive are improved.

[0088] It should be noted that in this document, such as the term "comprise", "include" or any other variant thereof, is intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or also include elements inherent to such processes, methods, articles or devices.

[0089] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the application.

Claims

1. A decarbonized coal gangue-based adhesive, characterized by, By mass parts include the following components: 20-35 parts of coal gangue-based full solid waste cement, 66-78 parts of compound powder, 1-4 parts of latex powder, 1-2 parts of reinforcing agent and 1-2 parts of fiber material; The compound powder is obtained by crushing, screening and grading the decarburized coal gangue and grading with expanded graphite powder, and specifically composed of 50-100 mesh expanded graphite powder, 20-150 mesh decarburized coal gangue and 150-800 mesh decarburized coal gangue, wherein the 50-100 mesh expanded graphite powder accounts for 1.5-2wt% of the compound powder, and the 20-150 mesh decarburized coal gangue accounts for 15-25wt% of the compound powder.

2. The coal gangue-based adhesive according to claim 1, characterized in that, The coal gangue-based full solid waste cement is a Portland cement produced by taking coal gangue, high calcium tailings and quartz tailings as raw materials, wherein SiO2+Al2O3 in the coal gangue is greater than 85wt%, CaO in the high calcium tailings is greater than 45wt%, and SiO2 in the quartz tailings is greater than 90wt%.

3. The coal gangue-based adhesive according to claim 1, wherein the coal gangue-based adhesive is characterized by, The latex powder is composed of synthetic resin powder, organic tin catalyst and protective colloid, wherein the organic tin catalyst accounts for 0.025-0.05wt% of the latex powder, and the protective colloid accounts for 4-6wt% of the latex powder.

4. The coal gangue-based adhesive according to claim 3, characterized in that, The synthetic resin powder is prepared by spray drying of vinyl acetate-ethylene copolymer and silane-terminated polyurethane prepolymer, and the silane-terminated polyurethane prepolymer accounts for 5-10wt% of the synthetic resin powder.

5. The coal gangue-based adhesive according to claim 4, wherein, The silane-terminated polyurethane prepolymer is obtained by terminating the hydroxyl-terminated polyurethane prepolymer with isocyanate silane coupling agent.

6. The coal gangue-based adhesive according to claim 3, wherein the coal gangue-based adhesive is characterized by, The organic tin catalyst is stannous octoate.

7. The coal gangue-based adhesive according to claim 3, wherein the coal gangue-based adhesive is characterized by, The protective colloid is one or more of polyvinyl alcohol, sodium polyacrylate and polyethylene glycol in any mass ratio.

8. The coal gangue-based adhesive according to claim 1, wherein, The reinforcing agent is one or more of calcium chloride, sodium aluminate, sodium carbonate, sodium formate, triethanolamine and calcium formate in any mass ratio.

9. The coal gangue-based adhesive according to claim 1, wherein, The fiber material is one or more of wind turbine blade recycled fiber, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, polypropylene fiber, polyvinyl alcohol fiber and glass fiber in any mass ratio.

10. The preparation method of the decarburized coal gangue-based adhesive according to claim 1, comprising the following steps: The coal gangue-based full solid waste cement, compound powder, latex powder, water reducing agent, reinforcing agent and fiber material are added into a mixer, and mixed at a speed of 24r / min for 15-25min. After mixing, the discharging, inspection, metering, sealing and packaging procedures are sequentially carried out to obtain the decarburized coal gangue-based adhesive.

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