Dust-free cement-based binder as well as preparation method and application thereof

Abstract

The invention provides a dust-free cement-based binder as well as a preparation method and application thereof, and the dust-free cement-based binder is prepared from the following raw materials in percentage by weight: 0.1%-0.2% of a dust inhibitor, 0.1%-0.2% of a binding agent, 0.1%-0.2% of a binding agent and the balance of water. 35%-45% of cement; 35%-60% of quartz sand; 3%-8% of quartz powder; 3%-6% of rubber powder; 0.5%-2% of an auxiliary agent; the dust inhibitor is prepared from the following raw materials in percentage by weight: 80-90% of fatty acid ester; 5% to 10% of C12-C14 alkyl glycidyl ether; 0.1% to 0.5% of triethanolamine monooleate; and 5%-20% of modified talcum powder. By adding the specific dust inhibitor, the dust raising problem of the cement-based binder in the production process is solved, so that the production process is cleaner; the problem of dust raising in the using process of the cement-based adhesive is solved, and the environment is protected; and the performance of the cement-based binder product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cement-based adhesives and relates to a dust-free cement-based adhesive and a preparation method and application thereof. Background Art

[0002] Cement-based binders are widely used, covering many fields such as construction engineering, road engineering, civil engineering, and water supply and drainage engineering. Dust will be generated during the production process, transportation process, and use process. Although sealed production and dust control can be carried out during the production process with the upgrading of production equipment, there are fewer control measures for cement dust during transportation and use, and the users are also weak in labor protection. Cement-based binders will generate dust during the mixing and use process, which pollutes the environment on the one hand, and long-term inhalation of cement dust by the human body can easily cause occupational diseases such as silicosis and cement pneumoconiosis on the other hand. In order to solve the risk of dust pollution and harm to the human body caused by cement-based binders, cement-based binders need to be treated at the source so that they do not generate dust during production and use, and environmentally friendly products are prepared.

[0003] CN117735923A discloses a method for preparing a dust-free caulking agent, which comprises the following steps: mixing an organic solvent with latex powder to obtain a mixture A; mixing the mixture A with a powder composition containing silicate cement to obtain a mixture B; and drying the mixture B at a temperature higher than the boiling point of the organic solvent to obtain a dust-free caulking agent. The dust-free caulking agent obtained by the method significantly reduces dust, does not affect the hydration process of silicate cement, and has good strength properties.

[0004] The high-boiling-point organic solvent used in the preparation of dust-free caulking agent in this method has a strong odor on the one hand, and on the other hand, the evaporation of the solvent during drying will still cause pollution to the environment.

[0005] Therefore, in the art, it is desired to develop a dust-free cement-based adhesive which does not use organic solvents and is safe and environmentally friendly. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a dust-free cement-based binder and a preparation method and application thereof.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a dust-free cement-based binder, wherein the raw materials for preparing the dust-free cement-based binder include the following components by weight percentage:

[0009]

[0010] The raw materials for preparing the dust suppressant include the following components by weight percentage:

[0011]

[0012] The present invention solves the dust problem of cement-based binders during production by adding dust suppressants, thereby making the production process cleaner; solves the dust problem of cement-based binders during use, thereby protecting the environment; and while solving the dust problem of cement-based binders, improves the performance of cement-based binder products.

[0013] The dust suppressant provided by the present invention has readily available raw materials, low cost, is non-volatile, non-hygroscopic, non-flammable, and is environmentally friendly and safe to produce; by adding the dust suppressant, other components in the cement-based binder can be effectively wetted and adsorbed, dust during production and use of the cement-based binder can be reduced, the environmental dust concentration can be reduced, and the health of production and construction personnel can be protected; by introducing the dust suppressant, the viscosity of the system can be reduced, the fluidity of the system can be increased, the processing performance of the system can be improved, deformation can be reduced, and dimensional stability can be improved; the introduction of polymer esters in the formula can effectively reduce the amount of water reducer used and save costs; by introducing the dust suppressant, the polymer material can effectively coordinate with calcium ions and improve the degree of combination between inorganic materials and organic materials, the rigidity of the cement-based binder can be effectively changed, the toughness can be improved, and the comprehensive performance of the cement-based binder can be improved.

[0014] By introducing high molecular weight esters and ethers into the raw materials for preparing dust suppressants, not only can the dust of cement-based products be greatly reduced, but also the amount of water used during mixing can be effectively reduced, thus saving water resources.

[0015] In the present invention, the amount of dust suppressant used in the preparation of the dust-free cement-based binder can be 0.1%, 0.12%, 0.14%, 0.16%, 0.18%, 0.2%, etc., based on weight percentage.

[0016] In the present invention, the raw materials for preparing the dust-free cement-based adhesive can be 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, etc. in terms of weight percentage.

[0017] In the present invention, the raw materials for preparing the dust-free cement-based adhesive can be used in an amount of quartz sand of 35%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, etc., calculated by weight percentage.

[0018] In the present invention, the raw materials for preparing the dust-free cement-based adhesive can be used in an amount of quartz powder of 3%, 4%, 5%, 6%, 7%, 8%, etc., in terms of weight percentage.

[0019] In the present invention, the raw materials for preparing the dust-free cement-based adhesive can be calculated by weight percentage, and the amount of rubber powder used can be 3%, 4%, 5%, 6%, etc.

[0020] In the present invention, the raw materials for preparing the dust-free cement-based adhesive are calculated by weight percentage, and the amount of the additive used can be 0.5%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, etc.

[0021] In the present invention, the amount of fatty acid ester used in the preparation of the dust suppressant raw materials can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, etc., calculated by weight percentage.

[0022] In the present invention, the amount of C12-C14 alkyl glycidyl ether used in the preparation of the dust suppressant can be 5%, 6%, 7%, 8%, 9%, 10%, etc., based on weight percentage.

[0023] In the present invention, the amount of triethanolamine monooleate used in the preparation of the dust suppressant can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc., based on weight percentage.

[0024] In the present invention, the amount of modified talc powder used in the preparation of the dust suppressant can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc., calculated by weight percentage.

[0025] Preferably, the modified talc is prepared by the following method:

[0026] The talc powder is dried at 90-120° C. (e.g., 90° C., 100° C., 110° C., 120° C., etc.) under stirring for 20-40 min (e.g., 20 min, 25 min, 30 min, 35 min, 40 min, etc.), and then a titanate coupling agent is added and mixed to obtain the modified talc powder.

[0027] The present invention introduces talcum powder modified by a titanate coupling agent, thereby facilitating the mixing and use of the dust inhibitor and improving the compatibility of the dust inhibitor with powder materials such as cement.

[0028] Preferably, based on the total amount of talc and titanate coupling agent as 100%, the amount of talc is 98.5% to 99.5%, for example, 98.5%, 98.6%, 98.7%, 98.8%, 98.9%, 99%, 99.1%, 99.2%, 99.3%, 99.4%, 99.5%, etc., and the amount of titanate coupling agent is 0.5% to 1.5%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, etc.

[0029] Preferably, the titanate coupling agent includes any one of a monoalkoxy pyrophosphate coupling agent and a chelate titanate coupling agent, or a combination of at least two of them, such as Anhui Tianchen Chemical TC-201, Nanjing Shuguang NDZ201 and other models.

[0030] Preferably, the mixing time is 10-20 min, such as 10 min, 15 min, 20 min, etc.

[0031] Preferably, the fatty acid ester includes any one of glycerol fatty acid ester, glycerol monooleate, propylene glycol fatty acid ester, propylene glycol monooleate, lauryl alcohol oleate, tetradecyl alcohol oleate, and isooctyl alcohol fatty acid ester, or a combination of at least two thereof.

[0032] Preferably, the cement comprises any one of PO32.5, PO42.5, PO52.5 ordinary Portland cement or a combination of at least two thereof.

[0033] Preferably, the rubber powder includes any one of vinyl acetate and ethylene copolymer, vinyl laurate, ethylene and vinyl chloride copolymer, and acrylic resin rubber powder, or a combination of at least two of them.

[0034] Preferably, the auxiliary agent includes any one of hydroxypropyl methylcellulose, bentonite, calcium formate, a water reducing agent, and starch ether, or a combination of at least two thereof.

[0035] In a second aspect, the present invention provides a method for preparing the dust-free cement-based binder as described in the first aspect, the preparation method comprising the following steps:

[0036] (1) mixing a formulated amount of fatty acid ester, C12-C14 alkyl glycidyl ether, triethanolamine monooleate, and modified talc, and stirring to obtain the dust suppressant;

[0037] (2) Add dust suppressant to cement, then add quartz sand, quartz powder, rubber powder and additives under stirring, mix and obtain the dust-free cement-based binder.

[0038] Preferably, the stirring frequency in step (1) is 15-25 Hz, for example 15 Hz, 18 Hz, 20 Hz, 23 Hz, 25 Hz, etc., and the stirring time is 30-60 min, for example 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, etc.

[0039] Preferably, the step (2) of adding the dust suppressant into the cement specifically comprises: adding the dust suppressant into the cement by dropwise addition during cement transportation, and using a twin-screw extruder for conveying and mixing.

[0040] In the preparation method of the dust-free cement-based binder provided by the present invention, a dust suppressant is first prepared, and at the same time, the dust suppressant is dripped into the cement transportation pipeline and mixed evenly, so that the generation of dust is controlled at the source. The method can be applied to the production of all cement-based binder products, has simple operation and low cost, and can improve the mechanical properties of cement-based products.

[0041] In a third aspect, the present invention provides a use of the dust-free cement-based binder as described in the first aspect in construction engineering, road engineering, civil engineering, and water supply and drainage engineering.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] The present invention solves the dust problem of cement-based binders in the production process by adding a specific dust inhibitor, thereby making the production process cleaner; solves the dust problem of cement-based binders in the use process, thereby protecting the environment; and while solving the dust problem of cement-based binders, improves the performance of cement-based binder products. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0045] Preparation Example 1

[0046] In this preparation example, a modified talcum powder is provided, and the modified talcum powder is prepared by the following method:

[0047] The talc powder was stirred and dried in a high-speed mixer preheated to 100° C. for 30 minutes, and then a titanate coupling agent was added and mixed for 15 minutes to obtain the modified talc powder;

[0048] Wherein, based on the total amount of talcum powder and titanate coupling agent as 100%, the amount of talcum powder (particle size of 10-15 μm) is 99%, and the amount of titanate coupling agent is 1%; the titanate coupling agent is Anhui Tianchen Chemical TC-201.

[0049] Preparation Example 2

[0050] In this preparation example, a modified talcum powder is provided, and the modified talcum powder is prepared by the following method:

[0051] The talc powder was stirred and dried in a high-speed mixer preheated to 90° C. for 20 minutes, and then a titanate coupling agent was added and mixed for 10 minutes to obtain the modified talc powder;

[0052] Wherein, based on the total amount of talcum powder and titanate coupling agent as 100%, the amount of talcum powder (particle size of 10-15 μm) is 98.5%, and the amount of titanate coupling agent is 1.5%; the titanate coupling agent is Anhui Tianchen Chemical TC-201.

[0053] Preparation Example 3

[0054] In this preparation example, a modified talcum powder is provided, and the modified talcum powder is prepared by the following method:

[0055] The talc powder was stirred and dried in a high-speed mixer preheated to 120° C. for 40 minutes, and then a titanate coupling agent was added and mixed for 20 minutes to obtain the modified talc powder;

[0056] Wherein, based on the total amount of talcum powder and titanate coupling agent as 100%, the amount of talcum powder (particle size of 10-15 μm) is 99.5%, and the amount of titanate coupling agent is 0.5%; the titanate coupling agent is Anhui Tianchen Chemical TC-201.

[0057] Synthesis Examples 1-3, Comparative Synthesis Examples 1-3

[0058] In Synthesis Examples 1-3 and Comparative Synthesis Examples 1-3, a dust suppressant is provided respectively. The raw materials and dosage (weight percentage) of the dust suppressant are shown in Table 1.

[0059] Table 1

[0060]

[0061]

[0062] The preparation method of the dust suppressant comprises the following steps:

[0063] According to the formulation in Table 1, the components were mixed in a disperser and stirred at 20 Hz for 40 minutes to obtain the dust suppressant.

[0064] Examples 1-5, Comparative Examples 1-4

[0065] In Examples 1-5 and Comparative Examples 1-4, a dust-free cement-based binder is provided respectively. The raw materials and dosage (weight percentage) of the dust-free cement-based binder are shown in Table 2.

[0066] Table 2

[0067]

[0068] Among them, the additives in Table 2 are a mixture of commercially available hydroxypropyl methylcellulose Tianpu 30011C, commercially available lithium bentonite, commercially available Jiantubao food-grade calcium formate, commercially available Jianhua Tianbao polycarboxylic acid water reducer, and commercially available starch ether Siam E300 in a mass ratio of 1:1:1:1:1.

[0069] The preparation method of the dust-free cement-based binder comprises the following steps:

[0070] According to the formula in Table 2, the dust suppressant is added to the cement by dripping when conveying the cement, and a twin-screw is used for conveying and mixing; then, quartz sand, quartz powder, rubber powder, and additives are added in sequence under high-speed stirring, mixed evenly, and packaged to obtain the dust-free cement-based binder.

[0071] The dust suppressants provided in the synthesis examples and comparative synthesis examples were tested as follows. The test methods and results are shown in Table 3.

[0072] Table 3

[0073] Inspection items Uniformity Compatibility with cement Test Method Visual Visual index Mix evenly without sedimentation or stratification Cement without agglomeration Synthesis example 1 Mix evenly without sedimentation or stratification No clumping Synthesis example 2 Mix evenly without sedimentation or stratification No clumping Synthesis example 3 Mix evenly without sedimentation or stratification No clumping Comparative Synthesis Example 1 Uneven mixing, with sedimentation and stratification There is agglomeration Comparative Synthesis Example 2 Mix evenly without sedimentation or stratification There is agglomeration Comparative Synthesis Example 3 Uneven mixing, with sedimentation and stratification There is agglomeration

[0074] The dust-free cement-based adhesives provided in the examples and comparative examples were subjected to performance tests, and the test methods and results are shown in Tables 4 and 5.

[0075] Table 4

[0076]

[0077]

[0078] Table 5

[0079]

[0080] It can be seen from Table 4 and Table 5 that the dust-free cement-based adhesives provided by the embodiments of the present invention have lower dust concentrations, higher tensile bond strength, better flexibility and anti-slip properties.

[0081] Compared with Example 1, the dust concentrations of the cement-based binders provided in Comparative Examples 1-4 were all significantly increased.

[0082] The applicant declares that the present invention illustrates the dust-free cement-based binder and its preparation method and application through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A dust-free cement-based adhesive, characterized in that: The raw materials for preparing the dust-free cement-based binder include the following components by weight percentage: The raw materials for preparing the dust suppressant include the following components by weight percentage:

2. The dust-free cement-based adhesive according to claim 1, characterized in that: The modified talcum powder is prepared by the following method: The talc powder is dried at 90-120° C. for 20-40 minutes under stirring conditions, and then a titanate coupling agent is added and mixed to obtain the modified talc powder.

3. The dust-free cement-based adhesive according to claim 2, characterized in that: Taking the total amount of talc and titanate coupling agent as 100%, the amount of talc is 98.5% to 99.5%, and the amount of titanate coupling agent is 0.5% to 1.5%; Preferably, the titanate coupling agent includes any one of a monoalkoxy pyrophosphate coupling agent and a chelate titanate coupling agent, or a combination of at least two thereof; Preferably, the mixing time is 10-20 min.

4. The dust-free cement-based adhesive according to any one of claims 1 to 3, characterized in that: The fatty acid ester includes any one of glycerol fatty acid ester, glycerol monooleate, propylene glycol fatty acid ester, propylene glycol monooleate, lauryl alcohol oleate, tetradecyl alcohol oleate, and isooctyl alcohol fatty acid ester, or a combination of at least two thereof.

5. The dust-free cement-based adhesive according to any one of claims 1 to 4, characterized in that: The cement includes any one of PO32.5, PO42.5, PO52.5 ordinary Portland cement or a combination of at least two of them.

6. The dust-free cement-based adhesive according to any one of claims 1 to 5, characterized in that: The rubber powder includes any one of vinyl acetate and ethylene copolymer, vinyl laurate, ethylene and vinyl chloride copolymer, and acrylic resin rubber powder, or a combination of at least two of them.

7. The dust-free cement-based adhesive according to any one of claims 1 to 6, characterized in that: The auxiliary agent includes any one of hydroxypropyl methylcellulose, bentonite, calcium formate, a water reducing agent, and starch ether, or a combination of at least two thereof.

8. A method for preparing a dust-free cement-based binder as claimed in any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: (1) mixing a formulated amount of fatty acid ester, C12-C14 alkyl glycidyl ether, triethanolamine monooleate, and modified talc, and stirring to obtain the dust suppressant; (2) Add dust suppressant to cement, then add quartz sand, quartz powder, rubber powder and additives under stirring, mix and obtain the dust-free cement-based binder.

9. The preparation method according to claim 8, characterized in that: The stirring frequency in step (1) is 15-25 Hz, and the stirring time is 30-60 min; Preferably, the step (2) of adding the dust suppressant into the cement specifically comprises: adding the dust suppressant into the cement by dropwise addition during cement transportation, and using a twin-screw extruder for conveying and mixing.

10. Use of the dust-free cement-based binder according to any one of claims 1 to 7 in construction engineering, road engineering, civil engineering, and water supply and drainage engineering.

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