Naphthalene water reducer composite nanocrystal nucleus early strength agent and preparation method thereof

Abstract

The invention discloses a naphthalene water reducer composite nanocrystal nucleus early strength agent and a preparation method thereof, and relates to the technical field of early strength agents. The high-early-strength water reducing agent comprises the following materials in parts by weight: 68 parts of a naphthalene water reducing agent, 0.1 to 1 part of a defoaming agent, 3 to 30 parts of a super early-strength agent, 5 to 30 parts of an auxiliary dispersing agent, 120 to 160 parts of calcium salt or magnesium salt, 65 to 100 parts of sodium salt, 4.5 to 5.5 parts of sodium hydroxide and 500 to 700 parts of water. The invention can be used as a seed material of Portland cement, magnesium cement and gypsum building materials, and has good compatibility and workability; the early strength agent is wide in application range and low in price, and can well meet the market requirements of Portland cement, magnesium cement and gypsum building materials; the process is green, safe, low in cost and easy to control, and large-scale production can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of early strength agents, and particularly relates to a naphthalene-based water reducer composite nano-crystal core early strength agent and a preparation method thereof. Background Art

[0002] In the field of building materials and engineering, in order to shorten the demoulding cycle of prefabricated components, speed up the turnover of formwork and the utilization rate of pedestals, and carry out construction in low temperatures in northern winter, engineering technologies that improve the early strength of concrete are involved. General early strength technologies are divided into three categories: the use of special early strength cement, steam curing of engineering components, and the addition of early strength agents. Due to the convenience and flexibility of engineering, the early strength strategy of adding concrete early strength agents has been widely adopted. Traditional early strength admixtures are mainly inorganic salts and organic alcohol amines, but anions such as chloride ions and sulfate ions in inorganic salts will seriously reduce the durability of concrete, and the direct addition of potassium and sodium salts will cause salting out and stimulate alkali-aggregate reaction; organic alcohol amines have problems such as high price, high requirements for cement quality, poor universality, and strength shrinkage.

[0003] The use of nanocrystalline core concrete additives to improve the early strength of concrete is a relatively new one among the existing technical means. The current common preparation method is to use a chemical titration sol method, that is, to use sodium metasilicate, a soluble calcium source, and prepare a nanoparticle sol system in the presence of a dispersant. The size distribution of the nanocrystalline core determines the product stability of the early strength agent itself. The dispersant used in the commercially available nano-type early strength agent is a polycarboxylic acid-type polymer, i.e., a water-reducing agent product. Its structural molecular weight is large, and it has good steric hindrance and certain dispersing effects, but the product performance and process requirements are very high. At the same time, different types of polycarboxylic acid water-reducing agents have a great influence on the nucleation form of nano-crystal seeds and the performance of the product. As a competitive product of polycarboxylic acid water-reducing agent, naphthalene-based water-reducing agent, its related nanocrystalline core early strength additives have not been reported, and at the same time, the powder early strength additives based on naphthalene-based nanocrystalline cores have not been reported. Naphthalene-based water-reducing agent itself is a water-reducing agent with the widest applicability, which accounts for more than 70% of the water-reducing agent dosage, and the accumulated process conditions are mature and the cost is low. At the same time, naphthalene products are chemically incompatible with some polycarboxylic acid products, which will cause precipitation and deactivation. Therefore, the development of naphthalene-based nanocrystalline core early strength additives is of great significance for naphthalene-based concrete systems. Summary of the invention

[0004] The invention provides a naphthalene-based water-reducing agent composite nano-crystal core early strength agent and a preparation method thereof. The early strength agent comprises a naphthalene-based water-reducing agent, a defoaming agent, a super early strength agent, a dispersant, a calcium salt or a magnesium salt, a sodium salt and sodium hydroxide, etc. The early strength agent can be used as a seed material of silicate cement, magnesium cement and gypsum building materials, has good compatibility and workability, and the early strength agent has a wide application range and a low price, and can well meet the market demand for silicate cement, magnesium cement and gypsum building materials; the early strength agent of the scheme is used as a seed material of silicate cement and gypsum board and as an admixture for concrete gypsum board building materials, has a wide application range and wide adaptability, has a green and safe process and a low cost, is easy to control, and can realize large-scale production; in summary, the problems in the background technology are solved.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The invention discloses a naphthalene series water reducer composite nano crystal core early strength agent, which comprises the following materials in parts by weight: 68 parts by weight of a naphthalene series water reducer, 0.1 to 1 parts by weight of a defoamer, 3 to 30 parts by weight of a super early strength agent, 5 to 30 parts by weight of a dispersant, 120 to 160 parts by weight of a calcium salt or a magnesium salt, 65 to 100 parts by weight of a sodium salt, 4.5 to 5.5 parts by weight of sodium hydroxide and 500 to 700 parts by weight of water.

[0007] Furthermore, the naphthalene-based water reducer is any naphthalene-based high-concentration water reducer powder, a low-concentration product with the same effective solid content by weight, or a compound liquid product with the same solid content by weight.

[0008] Furthermore, the defoaming agent is at least one of a high-carbon alcohol defoaming agent, an organosilicon emulsion defoaming agent or a polysiloxane defoaming agent.

[0009] Furthermore, the super early strength agent is at least one of ethylenediamine, triethanolamine, sodium thiosulfate, sodium formate, sodium thiocyanate, lithium sulfate or lithium carbonate.

[0010] Furthermore, the dispersant is at least one of ethylenediaminetetraacetic acid, tributanolamine, triisopropanolamine, tetrahydroxypropylethylenediamine, tetrahydroxyethylethylenediamine, tetramethylethylenediamine or triethanolamine.

[0011] Furthermore, the calcium salt or magnesium salt is any one of calcium nitrate, calcium formate, calcium chloride, magnesium nitrate, magnesium formate or magnesium chloride.

[0012] Furthermore, the sodium salt is any one of sodium metasilicate, sodium sulfate or sodium thiocyanate.

[0013] A method for preparing a naphthalene-based water-reducing agent composite nano-crystal core early strength agent is used to prepare the above-mentioned naphthalene-based water-reducing agent composite nano-crystal core early strength agent, comprising the following steps:

[0014] S1. Prepare sodium salt, calcium salt or magnesium salt according to corresponding parts by weight;

[0015] S2, prepare naphthalene series water reducing agent, add corresponding weight parts of water to dilute, add corresponding weight parts of sodium hydroxide to alkalize;

[0016] S3, adding corresponding weight parts of defoamer, super early strength agent and dispersant to dissolve to obtain naphthalene water reducer alkalization mother solution;

[0017] S4, in a highly dispersed state, the sodium salt and the calcium salt or magnesium salt prepared in step S1 are simultaneously and uniformly added to the alkalized mother solution of the naphthalene-based water reducer obtained in step S3 at a certain rate, and the resulting solution is a nano early strength agent;

[0018] S5, spray-drying the nano early strength agent obtained in step S4 to obtain a powder early strength agent.

[0019] Furthermore, the titration in step S4 is completed in four hours, and the titration rate is adjusted according to the amount of the material.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The early strength agent of the present technical solution includes naphthalene-based water reducer, defoamer, super early strength agent, dispersant, calcium salt or magnesium salt, sodium salt and sodium hydroxide, etc., which can be used as seed materials for silicate cement, magnesium cement and gypsum building materials, and has good compatibility and workability;

[0022] (2) The early strength agent has a wide range of applications and is low in price, and can well meet the market demand for silicate cement, magnesium cement and gypsum building materials;

[0023] (3) The early strength agent of this scheme is used as the seed material of silicate cement and gypsum board, and as the admixture of concrete gypsum board building materials, it has a wide range of applications, wide adaptability, green and safe process, low cost, easy control, and can achieve large-scale production;

[0024] (4) The early strength agent in this scheme can significantly improve the structural strength of silicate cement and gypsum board.

[0025] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 This is a composition and weight percentage diagram of a naphthalene-based water-reducing agent composite nano-crystalline core early strength agent of the present invention;

[0028] Figure 2 A scene diagram of a cement slurry mixer for mixing in a specific embodiment of the present invention;

[0029] Figure 3 This is a scene diagram of a slurry expansion degree experiment using a springboard in a specific embodiment of the present invention;

[0030] Figure 4 This is a scene diagram of performing a mold filling operation on the mortar and smoothing the surface slurry in a specific embodiment of the present invention;

[0031] Figure 5 This is a scene diagram of using an integrated press to test the compressive and flexural strengths of a mortar test block in a specific embodiment of the present invention;

[0032] Figure 6 This is a micrograph at 200 nm obtained by electron microscope observation of the early strength agent sample of Example 7;

[0033] Figure 7 This is a micrograph at 50 nm obtained by electron microscope observation of the early strength agent sample of Example 7;

[0034] Figure 8 The early strength agent sample of Example 9 was observed by electron microscope, and the micrograph at 500nm was obtained;

[0035] Fig. 9 This is a micrograph at 500 nm obtained by electron microscope observation of the early strength agent sample of Example 1. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1As shown, a naphthalene-based water-reducing agent composite nano-crystal core early strength agent of the present invention comprises the following materials in parts by weight: 68 parts by weight of a naphthalene-based water-reducing agent, 0.1 to 1 parts by weight of a defoaming agent, 3 to 30 parts by weight of a super early strength agent, 5 to 30 parts by weight of a dispersant, 120 to 160 parts by weight of a calcium salt or a magnesium salt, 65 to 100 parts by weight of a sodium salt, 4.5 to 5.5 parts by weight of sodium hydroxide, and 500 to 700 parts by weight of water.

[0038] The naphthalene-based water reducer may be any naphthalene-based high-concentration water reducer powder, a low-concentration product with the same effective solid content by weight, or a compound liquid product with the same solid content by weight.

[0039] The defoaming agent is at least one of a high-carbon alcohol defoaming agent, an organosilicon emulsion defoaming agent or a polysiloxane defoaming agent.

[0040] The super early strength agent is at least one of ethylenediamine, triethanolamine, sodium thiosulfate, sodium formate, sodium thiocyanate, lithium sulfate or lithium carbonate.

[0041] The dispersant is at least one of ethylenediaminetetraacetic acid, tributanolamine, triisopropanolamine, tetrahydroxypropylethylenediamine, tetrahydroxyethylethylenediamine, tetramethylethylenediamine or triethanolamine.

[0042] The calcium salt or magnesium salt is any one of calcium nitrate, calcium formate, calcium chloride, magnesium nitrate, magnesium formate or magnesium chloride.

[0043] The sodium salt is any one of sodium metasilicate, sodium sulfate or sodium thiocyanate.

[0044] A method for preparing a naphthalene-based water-reducing agent composite nano-crystal core early strength agent is used to prepare the above-mentioned naphthalene-based water-reducing agent composite nano-crystal core early strength agent, comprising the following steps:

[0045] S1. Prepare sodium salt, calcium salt or magnesium salt according to corresponding parts by weight;

[0046] S2, prepare naphthalene series water reducing agent, add corresponding weight parts of water to dilute, add corresponding weight parts of sodium hydroxide to alkalize;

[0047] S3, adding corresponding weight parts of defoamer, super early strength agent and dispersant to dissolve to obtain naphthalene water reducer alkalization mother solution;

[0048] S4, in a highly dispersed state, the sodium salt and the calcium salt or magnesium salt prepared in step S1 are simultaneously and uniformly added to the alkalized mother solution of the naphthalene-based water reducer obtained in step S3 at a certain rate, and the resulting solution is a nano early strength agent;

[0049] S5, spray-drying the nano early strength agent obtained in step S4 to obtain a powder early strength agent.

[0050] The titration in step S4 is completed in four hours, and the titration rate is adjusted according to the amount of the material. Specific embodiment 1:

[0052] 68 parts by weight of naphthalene water reducer, 0.1 parts by weight of high alcohol defoamer, 3 parts by weight of ethylenediamine, 10 parts by weight of sodium thiosulfate, 5 parts by weight of dispersant, 4.5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured into a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 65 parts by weight of sodium salt are configured into a sodium salt solution, 150 parts by weight of water and 120 parts by weight of calcium salt or magnesium salt are configured into a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000 rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 2:

[0054] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0055] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 0.1 parts by weight of organosilicon emulsion defoamer, 3 parts by weight of ethylenediamine, 3 parts by weight of organosilicon emulsion defoamer, 12 parts by weight of sodium thiocyanate, 5 parts by weight of dispersant, 4.5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 70 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 120 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 3:

[0057] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0058] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 0.1 parts by weight of polysiloxane defoamer, 4 parts by weight of ethylenediamine, 5 parts by weight of dispersant and 4.5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured into a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 70 parts by weight of sodium salt are configured into a sodium salt solution, 150 parts by weight of water and 120 parts by weight of calcium salt or magnesium salt are configured into a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 4:

[0060] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0061] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 1 part by weight of high-carbon alcohol defoamer, 5 parts by weight of ethylenediamine, 4 parts by weight of lithium sulfate, 5 parts by weight of dispersant and 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 75 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 120 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 5:

[0063] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0064] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 1 part by weight of organosilicon emulsion defoamer, 3 parts by weight of ethylenediamine, 5 parts by weight of lithium sulfate, 5 parts by weight of dispersant and 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured into a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 80 parts by weight of sodium salt are configured into a sodium salt solution, 150 parts by weight of water and 120 parts by weight of calcium salt or magnesium salt are configured into a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 6:

[0066] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0067] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 1 part by weight of polysiloxane defoamer, 3 parts by weight of ethylenediamine, 5 parts by weight of lithium carbonate, 10 parts by weight of dispersant and 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 85 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 160 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 7:

[0069] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0070] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 0.5 parts by weight of high alcohol defoamer, 10 parts by weight of ethylenediamine, 10 parts by weight of triethanolamine, 10 parts by weight of lithium carbonate, 10 parts by weight of dispersant and 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 90 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 160 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 8:

[0072] This embodiment is the same as the specific embodiment 1 except that the components are adjusted;

[0073] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 0.5 parts by weight of high alcohol defoamer, 20 parts by weight of ethylenediamine, 2 parts by weight of triethanolamine, 10 parts by weight of dispersant and 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 95 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 160 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent; Specific embodiment 9:

[0075] In this embodiment, except for the adjustment of components, the process conditions are the same as those of the specific embodiment 1, except that the final product is dried by powder spraying to obtain a naphthalene-based water-reducing agent nano early strength agent powder product, and the amount used in the test block is consistent with the effective solid content of the solution product. The obtained sample is tested;

[0076] In this specific embodiment, 68 parts by weight of naphthalene water reducer, 0.5 parts by weight of high alcohol defoamer, 30 parts by weight of ethylenediamine, 2 parts by weight of lithium sulfate, 10 parts by weight of dispersant, 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 100 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 160 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent;

[0077] Comparative Example 1:

[0078] Except for the adjustment of components, the process conditions are the same as those in Example 1.

[0079] In this comparative example, 68 parts by weight of naphthalene water reducer, 2 parts by weight of triethanolamine defoamer, 20 parts by weight of ethylenediamine, 10 parts by weight of dispersant, 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 80 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 160 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000rpm; the resulting solution is a liquid nano early strength agent;

[0080] Comparative Example 2:

[0081] Except for the adjustment of components, the process conditions are the same as those in Example 1.

[0082] In this comparative example, 68 parts by weight of naphthalene water reducer, 0.5 parts by weight of high alcohol defoamer, 10 parts by weight of dispersant, 5 parts by weight of sodium hydroxide and 200 parts by weight of water are configured to form a naphthalene water reducer alkalization mother solution, 150 parts by weight of water and 80 parts by weight of sodium salt are configured to form a sodium salt solution, 150 parts by weight of water and 160 parts by weight of calcium salt or magnesium salt are configured to form a calcium salt or magnesium salt solution, and the sodium salt solution and the calcium salt or magnesium salt solution are simultaneously dripped into the naphthalene water reducer alkalization mother solution at a certain rate under a high dispersion state of 2000 rpm; the resulting solution is a liquid nano early strength agent;

[0083] The early strength agent solutions obtained in the above specific examples 1-8 and comparative examples 1-2 were subjected to compression tests on mortar test blocks with different amounts of early strength agent through mortar test blocks, and the strength indexes at different times were recorded, which can intuitively reflect the effect of the nano early strength agent on cement-based materials;

[0084] The specific proportion is 600 parts by weight of standard cement, 1500 parts by weight of standard sand, 6 parts by weight of naphthalene-based water reducer (8% solid content), 220 parts by weight of water, 2 parts by weight of naphthalene-based liquid nano early strength agent, room temperature of 25 degrees Celsius, and relative humidity of 50%; the specific results are shown in the following Table 1: Experimental results table;

[0085]

[0086]

[0087] Table 1: Experimental results

[0088] Through the above Table 1: different formulas will reflect different early strength performance, but the effect is very obvious; it is very helpful for the early strength of 8 hours, 1 day and 3 days; in this specific embodiment, Example 7 is the optimal embodiment for ultra-early strength, which is 314.81% higher than the benchmark strength, and Example 8 has the most obvious improvement in 3-day strength, which is 47.65% higher than the benchmark strength, and the 8-hour early strength is also 240.74% higher than the benchmark strength. Both are suitable for different application scenarios; and the embodiments of this scheme are improved over Comparative Examples 1 and 2.

[0089] In the above 2000rpm high dispersion state, NJ-160A cement slurry mixer is used for mixing. It is a device that implements the provisions of GB1346-89. It can make uniform experimental slurry for measuring cement standard consistency, setting time and making stability test blocks. It is a common equipment in cement plants, construction units, relevant professional colleges and scientific research institutions, and cement laboratories. For details, see Figure 2 After taking out the stirred material, the slurry expansion test was carried out using the springboard. Figure 3 As shown; then the mortar is molded and the surface slurry is scraped flat, see Figure 4 As shown, in this specific embodiment, the size of the mortar steel mold is 40*40*160mm, the template is detachable, can be maintained under different conditions, and strength tests can be performed according to specific time requirements; during the test, Figure 5 As shown, an integrated press is used to test the compressive and flexural strength of the mortar test block. The test method is to continuously apply pressure with a jack. When the test block breaks, the pressure value will instantly decrease, and the machine will record its value and fill the recorded value into Table 1;

[0090] For further observation, the early strength agent sample of the best embodiment 7 of this scheme was observed by electron microscope, and the following Figure 6 The micrograph at 200 nm is shown. Figure 7 The micrograph at 50 nm is shown. Figure 8 The figure shows a micrograph at 500 nm obtained by electron microscope observation of the early strength agent sample of Example 9; Fig. 9 This is a micrograph of the early strength agent sample of specific example 1 observed by electron microscope at 500 nm.

[0091] Through the above specific embodiments and data comparison, it can be known that the early strength agent prepared by the present technical solution can greatly improve the structural strength; it can be used as a seed material for silicate cement, magnesium cement and gypsum building materials, with good compatibility and workability; as an admixture for concrete gypsum board building materials, it has a wide range of applications and wide adaptability, and can achieve large-scale production; at the same time, the naphthalene-based water reducer itself is an economical water reducer with a low price, which can well meet the market demand for silicate cement, magnesium cement and gypsum building materials.

[0092] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A naphthalene-based water reducer composite nanocrystalline core early strength agent, characterized in that: The invention comprises the following materials in parts by weight: 68 parts by weight of a naphthalene-based water reducer, 0.1 to 1 parts by weight of a defoamer, 3 to 30 parts by weight of a super early strength agent, 5 to 30 parts by weight of a dispersant, 120 to 160 parts by weight of a calcium salt or a magnesium salt, 65 to 100 parts by weight of a sodium salt, 4.5 to 5.5 parts by weight of sodium hydroxide and 500 to 700 parts by weight of water.

2. A naphthalene-based water reducer composite nanocrystalline core early strength agent according to claim 1, characterized in that: The naphthalene series water reducer is any naphthalene series high-concentration water reducer powder, a low-concentration product with the same effective solid content by weight, or a compound liquid product with the same solid content by weight.

3. A naphthalene-based water reducer composite nano-crystal core early strength agent according to claim 1, characterized in that: The defoamer is at least one of a high-carbon alcohol defoamer, an organosilicon emulsion defoamer or a polysiloxane defoamer.

4. A naphthalene-based water reducer composite nano-crystal core early strength agent according to claim 1, characterized in that: The super early strength agent is at least one of ethylenediamine, triethanolamine, sodium thiosulfate, sodium formate, sodium thiocyanate, lithium sulfate or lithium carbonate.

5. A naphthalene-based water reducer composite nano-crystal core early strength agent according to claim 1, characterized in that: The dispersant is at least one of ethylenediaminetetraacetic acid, tributanolamine, triisopropanolamine, tetrahydroxypropylethylenediamine, tetrahydroxyethylethylenediamine, tetramethylethylenediamine or triethanolamine.

6. A naphthalene-based water reducer composite nano-crystal core early strength agent according to claim 1, characterized in that: The calcium salt or magnesium salt is any one of calcium nitrate, calcium formate, calcium chloride, magnesium nitrate, magnesium formate or magnesium chloride.

7. A naphthalene-based water reducer composite nano-crystal core early strength agent according to claim 1, characterized in that: The sodium salt is any one of sodium metasilicate, sodium sulfate or sodium thiocyanate.

8. A method for preparing a naphthalene-based water-reducing agent composite nano-crystal core early strength agent, which is used to prepare a naphthalene-based water-reducing agent composite nano-crystal core early strength agent as claimed in any one of claims 1 to 7, characterized in that: The steps include: S1. Prepare sodium salt, calcium salt or magnesium salt according to corresponding parts by weight; S2, prepare naphthalene series water reducing agent, add corresponding weight parts of water to dilute, add corresponding weight parts of sodium hydroxide to alkalize; S3, adding corresponding weight parts of defoamer, super early strength agent and dispersant to dissolve to obtain naphthalene water reducer alkalization mother solution; S4, in a highly dispersed state, the sodium salt and the calcium salt or magnesium salt prepared in step S1 are simultaneously and uniformly added to the alkalized mother solution of the naphthalene-based water reducer obtained in step S3 at a certain rate, and the resulting solution is a nano early strength agent; S5. Spray-dry the nano early strength agent obtained in step S4 to obtain a powder early strength agent.

9. The method for preparing a naphthalene-based water reducer composite nano-crystal core early strength agent according to claim 8, characterized in that: The titration in step S4 is completed in four hours, and the titration rate is adjusted according to the amount of material.

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