CN112358222A - Environment-friendly concrete early strength agent and preparation method thereof - Google Patents
Environment-friendly concrete early strength agent and preparation method thereof Download PDFInfo
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- CN112358222A CN112358222A CN202011287250.XA CN202011287250A CN112358222A CN 112358222 A CN112358222 A CN 112358222A CN 202011287250 A CN202011287250 A CN 202011287250A CN 112358222 A CN112358222 A CN 112358222A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/40—Polyamides containing oxygen in the form of ether groups
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
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Abstract
The invention discloses an environment-friendly concrete early strength agent which is characterized by comprising the following components in parts by weight: 4-8 parts of phosphine-containing terminal hyperbranched polyether, 3-5 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 6-8 parts of volcanic ash, 10-15 parts of dolomite, 4-6 parts of 1-butyl-3-methylimidazole nitrate, 2-4 parts of tris (hydroxymethyl) methylglycine and 25-30 parts of deionized water. The invention also discloses a preparation method of the environment-friendly concrete early strength agent. The environment-friendly concrete early strength agent disclosed by the invention has an obvious early strength effect, can quickly improve the early strength of concrete, greatly shortens the setting and hardening time of cement concrete, improves the construction efficiency, and is safe to use, environment-friendly and pollution-free.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to an environment-friendly concrete early strength agent and a preparation method thereof.
Background
Concrete is the most used building material in the world at present, and the main advantages of low price, strong bearing capacity and high durability are the concrete. Along with the continuous updating of the application range of the concrete, different requirements are provided for the performance of the concrete, and different application environments have different requirements for the performance of the concrete, such as the requirement of slowing down the hydration speed of the cement, delaying the occurrence of the hydration heat peak of the cement and reducing the probability of generating cracks due to temperature stress; however, in some rush repair projects, the concrete is required to be quickly set and to obtain strength so as to meet the requirements of rush repair of the projects. In the prior art, different performances of concrete are realized by adopting a method of adding additives into the concrete, so that the requirements of application environments are met.
The early strength agent is a common concrete additive, can accelerate the hydration speed of cement, improves the early strength of concrete, has no obvious influence on the later strength, and is mostly adopted in winter or emergency repair. According to the chemical component classification, the early strength agents are mainly divided into inorganic early strength agents and organic early strength agents. The inorganic salt early strength agent comprises chlorine salt, sulfate, nitrite, silicate and the like; the organic early strength agent comprises triethanolamine, calcium formate, urea and the like. The inorganic salt early strength agent is a concrete early strength agent with the widest application range and better early strength effect, but the application of the early strength agent has limitation due to the disadvantages of chloride, sulfate and other early strength agents, such as corrosivity, salting-out, large mixing amount and the like. The organic early strength agent does not damage concrete, but the reaction dosage of the organic early strength agent is difficult to control and the price is high, so the organic early strength agent is rarely used alone in practical application. In addition, the concrete early strength agent on the market has corresponding toxicity, is easy to cause environmental pollution and influences human health. The compounding of the early strength agents is a common method at the present stage, but the performance of the compounded product is only the performance superposition of different types of early strength agents, and the defects of various types of early strength agents cannot be fundamentally overcome.
The Chinese patent with application publication number CN 104031624A discloses a preparation method of a low-density cement slurry early strength agent, wherein the early strength agent is prepared from the following components in parts by weight: 35-55 parts of CaO and Al2O331 to 58 parts of SiO25 to 10 parts of Fe2O35-10 parts by weight, ball-milling, calcining at 1250-2CO3And (4) ball milling to obtain the low-density cement paste early strength agent. Although it achieves a certain early strength effect, it is not satisfactory in concrete applications, particularly in concrete strength. In addition, the calcination temperature is 1250-1400 ℃, which increases the preparation cost virtually and restricts the development of the early strength agent to a certain extent.
Therefore, the development of the environment-friendly concrete early strength agent which can rapidly improve the early strength of concrete, greatly shorten the setting and hardening time of cement concrete and improve the construction efficiency, is safe to use, environment-friendly and pollution-free, meets the market demand, has wide market value and application prospect, and has very important significance for promoting the development of the concrete additive industry.
Disclosure of Invention
In view of the above, the invention aims to provide an environment-friendly concrete early strength agent, which has an obvious early strength effect, can quickly improve the early strength of concrete, greatly shorten the setting and hardening time of cement concrete, improve the construction efficiency, and is safe to use, environment-friendly and pollution-free; meanwhile, the invention also provides a preparation method of the environment-friendly concrete early strength agent, and the preparation method is simple and easy to implement, convenient to operate, easy to obtain raw materials, low in equipment investment, high in preparation efficiency and finished product qualification rate, low in preparation cost and suitable for continuous large-scale production.
In order to achieve the purpose, the invention adopts the technical scheme that:
the environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 4-8 parts of phosphine-containing terminal hyperbranched polyether, 3-5 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 6-8 parts of volcanic ash, 10-15 parts of dolomite, 4-6 parts of 1-butyl-3-methylimidazole nitrate, 2-4 parts of tris (hydroxymethyl) methylglycine and 25-30 parts of deionized water.
Preferably, the number average molecular weight of the phosphine-containing terminal group hyperbranched polyether is 7530, the weight average molecular weight is 9812, the branching degree is 0.61, the preparation method is the prior art, and refer to the preparation method of the hyperbranched scale inhibiting polymer 3 of the Chinese patent application No. 201810383523.7 in the patent example 3 of China.
Preferably, the particle size of the volcanic ash is 500-800 meshes.
Preferably, the particle size of the dolomite is 300-500 meshes.
Preferably, the method for preparing the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 8-12 hours at 40-60 ℃ under the atmosphere of nitrogen or inert gas, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 85-95 ℃ to constant weight to obtain the urea/polyethylene glycol dicarboxylic acid condensation polymer.
Preferably, the molar ratio of the urea to the high-boiling-point solvent to the polyethylene glycol dicarboxylic acid to the catalyst is 1 (6-10) to 1 (0.8-1.2).
Preferably, the high boiling point solvent is at least one of dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone.
Preferably, the polyethylene glycol dicarboxylic acid is alpha, omega-dicarboxyethylene glycol, and the weight average molecular weight is 10000.
Preferably, the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline.
Preferably, the inert gas is any one of helium, neon and argon.
The invention also aims to provide a preparation method of the environment-friendly concrete early strength agent, which is characterized by comprising the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 6.5-7.5, and then the mixture is stirred for 1-3 hours at the temperature of 40-50 ℃, so that the environment-friendly concrete early strength agent is obtained.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
(1) the preparation method of the environment-friendly concrete early strength agent provided by the invention is simple and easy to implement, convenient to operate, easy to obtain raw materials, low in equipment investment, high in preparation efficiency and finished product qualification rate, low in preparation cost, suitable for continuous large-scale production, free of toxic and harmful gas generation in the preparation process, and high in social value, economic value and ecological value.
(2) The environment-friendly concrete early strength agent provided by the invention overcomes the disadvantages of traditional early strength agents such as chloride, sulfate and the like, such as corrosivity, salting-out, large mixing amount and the like, so that the application of the early strength agent has limitation; the reaction dosage of the organic early strength agent is difficult to control and the price is high, so that the organic early strength agent is rarely used independently in practical application; the environment-friendly concrete early strength agent also overcomes the defects that the concrete early strength agent on the market still has corresponding toxicity, is easy to cause environmental pollution and affects human health, the performance of a compound product is only the performance superposition of different types of early strength agents, and the technical problems of various types of early strength agents can not be solved fundamentally.
(3) The environment-friendly concrete early strength agent provided by the invention does not contain traditional early strength components such as chloride and sulfate, effectively avoids the defects of the environment-friendly concrete early strength agent, accelerates the hydration speed of cement by introducing water-soluble organic salts such as hyperbranched polyether containing phosphine end groups, and can accelerate the hydration of cement especially at low temperature, so that the early strength of cement concrete is greatly improved. The introduction of the hyperbranched polyether structure is beneficial to improving the adaptability of the early strength agent and concrete, so that the compatibility between the early strength agent and gas components is better, and the hyperbranched polyether structure is also beneficial to forming stable products with other components; the terminal phosphine group is beneficial to water reduction and slump retaining performance improvement.
(4) The environment-friendly concrete early strength agent provided by the invention is added with urea/polyethylene glycol dicarboxylic acid polycondensate to plasticize concrete and mixture, the early strength effect can be improved by introducing the polycondensate, the loss and the uneven dispersion of micromolecule urea are avoided, and the hydration process of cement can be effectively accelerated by introducing a soluble polyethylene glycol structure on a molecular main chain, so that the early strength performance of concrete is improved.
(5) According to the environment-friendly concrete early strength agent provided by the invention, the addition of 1-butyl-3-methylimidazole nitrate can promote the generation of calcium silicate hydrate, improve the pore structure of a hydrate product and improve the compactness of a mortar structure, and Ca is generated due to an ionic effect2+The increase of the concentration can accelerate the crystallization speed, increase the solid phase ratio, and is beneficial to the formation of a cement stone structure, nitrate ions are introduced in the form of organic salt and have synergistic effect with other components, so that the hydration of cement can be accelerated, and the cement can be promoted to generate a large amount of calcium hydroxide at an earlier age, thereby improving the early strength performance. The addition of volcanic ash and dolomite promotes the hydration process of cement, improves the early strength of concrete, and simultaneously has fillingThe effect is to increase the compactness of the concrete and improve the early strength of the concrete. In addition, the compactness of the concrete can be improved, the impermeability is improved, and the phenomena of layering and segregation and bleeding are reduced, so that the early strength of the concrete is obviously improved. The tris (hydroxymethyl) methylglycine can simultaneously improve the water reducing, retarding and early strength performances of the concrete; the early strength agent is prepared by the components according to the combination and proportion related to the technical scheme of the invention for the first time, and the beneficial technical effect of more obvious early strength effect is achieved on the whole.
Detailed Description
In order to make the technical solutions of the present invention better understood and make the above features, objects, and advantages of the present invention more comprehensible, the present invention is further described with reference to the following examples. The examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
In the embodiment of the invention, the raw materials are all purchased commercially; the number average molecular weight of the phosphine-containing terminal group hyperbranched polyether is 7530, the weight average molecular weight is 9812, the branching degree is 0.61, the preparation method is the prior art, and the preparation method is referred to the preparation method of the hyperbranched scale-inhibiting polymer 3 of the Chinese patent application No. 201810383523.7 in the patent example 3; the polyethylene glycol dicarboxylic acid is alpha, omega-dicarboxyl polyethylene glycol, and the weight average molecular weight is 10000.
Example 1
The environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 4 parts of phosphine-containing terminal hyperbranched polyether, 3 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 6 parts of volcanic ash, 10 parts of dolomite, 4 parts of 1-butyl-3-methylimidazole nitrate, 2 parts of tris (hydroxymethyl) methylglycine and 25 parts of deionized water.
The particle size of the volcanic ash is 500 meshes; the grain size of the dolomite is 300 meshes.
The preparation method of the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 8 hours at 40 ℃ in a nitrogen atmosphere, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 85 ℃ to constant weight to obtain a urea/polyethylene glycol dicarboxylic acid condensation polymer; the molar ratio of the urea to the high-boiling point solvent to the polyethylene glycol dicarboxylic acid to the catalyst is 1:6:1: 0.8; the high boiling point solvent is dimethyl sulfoxide; the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline.
The preparation method of the environment-friendly concrete early strength agent is characterized by comprising the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 6.5, and then the mixture is stirred for 1 hour at the temperature of 40 ℃, so that the environment-friendly concrete early strength agent is obtained.
Example 2
The environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 5 parts of hyperbranched polyether containing phosphine end groups, 3.5 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 6.5 parts of volcanic ash, 11 parts of dolomite, 4.5 parts of 1-butyl-3-methylimidazole nitrate, 2.5 parts of tris (hydroxymethyl) methylglycine and 26 parts of deionized water.
The particle size of the volcanic ash is 600 meshes; the grain size of the dolomite is 350 meshes.
The preparation method of the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 9 hours at 45 ℃ in an inert gas atmosphere, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 88 ℃ to constant weight to obtain a urea/polyethylene glycol dicarboxylic acid condensation polymer; the molar ratio of the urea to the high-boiling point solvent to the polyethylene glycol dicarboxylic acid to the catalyst is 1:7:1: 0.9; the high boiling point solvent is N, N-dimethylformamide; the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline; the inert gas is helium.
The preparation method of the environment-friendly concrete early strength agent is characterized by comprising the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 6.8, and then the mixture is stirred for 1.5 hours at the temperature of 43 ℃, so that the environment-friendly concrete early strength agent is obtained.
Example 3
The environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 6 parts of phosphine-containing terminal hyperbranched polyether, 4 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 7 parts of volcanic ash, 13 parts of dolomite, 5 parts of 1-butyl-3-methylimidazole nitrate, 3 parts of tris (hydroxymethyl) methylglycine and 27 parts of deionized water.
The particle size of the volcanic ash is 650 meshes; the grain size of the dolomite is 400 meshes.
The preparation method of the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 10 hours at 50 ℃ in an inert gas atmosphere, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 90 ℃ to constant weight to obtain a urea/polyethylene glycol dicarboxylic acid condensation polymer; the molar ratio of the urea to the high-boiling point solvent to the polyethylene glycol dicarboxylic acid to the catalyst is 1:8:1: 1; the high boiling point solvent is N, N-dimethylacetamide; the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline; the inert gas is neon.
The preparation method of the environment-friendly concrete early strength agent is characterized by comprising the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 7, and then the mixture is stirred for 2 hours at the temperature of 45 ℃ to obtain the environment-friendly concrete early strength agent.
Example 4
The environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 7 parts of phosphine-containing terminal hyperbranched polyether, 4.5 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 7.5 parts of volcanic ash, 14 parts of dolomite, 5.5 parts of 1-butyl-3-methylimidazole nitrate, 3.5 parts of tris (hydroxymethyl) methylglycine and 29 parts of deionized water.
The particle size of the volcanic ash is 750 meshes; the grain size of the dolomite is 450 meshes.
The preparation method of the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 11 hours at 55 ℃ in an inert gas atmosphere, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 93 ℃ to constant weight to obtain a urea/polyethylene glycol dicarboxylic acid condensation polymer; the molar ratio of the urea to the high-boiling point solvent to the polyethylene glycol dicarboxylic acid to the catalyst is 1:9.5:1: 1.1; the high-boiling-point solvent is formed by mixing dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone according to a mass ratio of 1:3:2: 1; the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline; the inert gas is argon.
The preparation method of the environment-friendly concrete early strength agent is characterized by comprising the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 7.3, and then the mixture is stirred for 2.5 hours at the temperature of 48 ℃, so that the environment-friendly concrete early strength agent is obtained.
Example 5
The environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 8 parts of phosphine-containing terminal hyperbranched polyether, 5 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 8 parts of volcanic ash, 15 parts of dolomite, 6 parts of 1-butyl-3-methylimidazole nitrate, 4 parts of tris (hydroxymethyl) methylglycine and 30 parts of deionized water; the particle size of the volcanic ash is 800 meshes; the grain size of the dolomite is 500 meshes.
The preparation method of the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 12 hours at 60 ℃ in a nitrogen atmosphere, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 95 ℃ to constant weight to obtain a urea/polyethylene glycol dicarboxylic acid condensation polymer; the molar ratio of the urea to the high-boiling point solvent to the polyethylene glycol dicarboxylic acid to the catalyst is 1:10:1: 1.2; the high boiling point solvent is N-methyl pyrrolidone; the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline.
The preparation method of the environment-friendly concrete early strength agent is characterized by comprising the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 7.5, and then the mixture is stirred for 3 hours at the temperature of 50 ℃, so that the environment-friendly concrete early strength agent is obtained.
Comparative example 1
The embodiment provides an environment-friendly concrete early strength agent, the formula and the preparation method of which are basically the same as those of the embodiment 1, except that hyperbranched polyether containing phosphine end groups is not added.
Comparative example 2
This example provides an environmentally friendly concrete early strength agent having a formulation and a preparation method substantially the same as those of example 1, except that no urea/polyethylene glycol dicarboxylic acid polycondensate was added.
Comparative example 3
This example provides an environmentally friendly concrete early strength agent having a formulation and a preparation method substantially the same as those of example 1, except that urea is used instead of the urea/polyethylene glycol dicarboxylic acid polycondensate.
Comparative example 4
The present example provides an environmentally friendly concrete early strength agent, which has a formulation and a preparation method substantially the same as those of example 1, except that no volcanic ash and no dolomite are added.
Comparative example 5
This example provides an environmentally friendly concrete early strength agent, which has a formulation and a preparation method substantially the same as those of example 1, except that 1-butyl-3-methylimidazole nitrate is not added.
Comparative example 6
This example provides an environmentally friendly concrete early strength agent, which has a formulation and a preparation method substantially the same as those of example 1, except that sodium nitrate is used instead of 1-butyl-3-methylimidazole nitrate.
Comparative example 7
This example provides an environmentally friendly concrete early strength agent, which has a formulation and a preparation method substantially the same as those of example 1, except that tris (hydroxymethyl) methylglycine is not added.
The environmental-friendly concrete early strength agent described in examples 1-5 and comparative examples 1-7 was subjected to performance tests, and the test results are shown in table 1. The performance test method is carried out by referring to GB8076-2008, wherein the concrete proportion is (kg/m)3) Comprises the following steps: m (cement), m (fly ash), m (sand), m (small pebble), m (water), 280:56:840:1050: 170; the mixing amount of the environment-friendly concrete early strength agent is 1 percent.
As can be seen from Table 1, compared with the comparative examples, the environment-friendly composite early strength water reducing agent disclosed by the embodiment of the invention has better water reducing effect, higher compressive strength and no negative influence on the performance of a concrete body, and is a result of the synergistic effect of the components such as the phosphine-containing terminal group hyperbranched polyether, the urea/polyethylene glycol dicarboxylic acid polycondensate, the volcanic ash, the dolomite, the 1-butyl-3-methylimidazolium nitrate, the tris (hydroxymethyl) methylglycine and the like. From comparison of the data of the comparative example with those of the examples, it can be seen that the early strength property is better by replacing urea with urea/polyethylene glycol dicarboxylic acid polycondensate, and the addition of 1-butyl-3-methylimidazole nitrate, an organic nitrate, is more effective than the early strength property of inorganic sodium nitrate.
TABLE 1
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The environment-friendly concrete early strength agent is characterized by comprising the following components in parts by weight: 4-8 parts of phosphine-containing terminal hyperbranched polyether, 3-5 parts of urea/polyethylene glycol dicarboxylic acid polycondensate, 6-8 parts of volcanic ash, 10-15 parts of dolomite, 4-6 parts of 1-butyl-3-methylimidazole nitrate, 2-4 parts of tris (hydroxymethyl) methylglycine and 25-30 parts of deionized water.
2. The environment-friendly concrete early strength agent as claimed in claim 1, wherein the number average molecular weight of the phosphine-containing terminal group hyperbranched polyether is 7530, the weight average molecular weight is 9812, and the branching degree is 0.61.
3. The environment-friendly concrete early strength agent as claimed in claim 1, wherein the particle size of the volcanic ash is 500-800 mesh.
4. The environment-friendly concrete early strength agent as claimed in claim 1, wherein the particle size of the dolomite is 300-500 mesh.
5. The environment-friendly concrete early strength agent as claimed in claim 1, wherein the preparation method of the urea/polyethylene glycol dicarboxylic acid polycondensate comprises the following steps: dissolving urea in a high-boiling-point solvent, adding polyethylene glycol dicarboxylic acid and a catalyst after the urea is completely dissolved, stirring and reacting for 8-12 hours at 40-60 ℃ under the atmosphere of nitrogen or inert gas, then performing rotary evaporation to remove the solvent and byproducts, and drying in a vacuum drying oven at 85-95 ℃ to constant weight to obtain the urea/polyethylene glycol dicarboxylic acid condensation polymer.
6. The environment-friendly concrete early strength agent as claimed in claim 5, wherein the molar ratio of the urea, the high boiling point solvent, the polyethylene glycol dicarboxylic acid and the catalyst is 1 (6-10) to 1 (0.8-1.2).
7. The environment-friendly concrete early strength agent as claimed in claim 5, wherein the high boiling point solvent is at least one of dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone.
8. The environment-friendly concrete early strength agent as claimed in claim 5, wherein the polyethylene glycol dicarboxylic acid is α, ω -dicarboxylpolyethylene glycol, and has a weight average molecular weight of 10000.
9. The environment-friendly concrete early strength agent as claimed in claim 5, wherein the catalyst is 2-ethoxy-1-ethoxycarbonyl-1, 2-dihydroquinoline; the inert gas is any one of helium, neon and argon.
10. The environment-friendly concrete early strength agent according to any one of claims 1 to 9, wherein the preparation method of the environment-friendly concrete early strength agent comprises the following steps: the components are uniformly mixed according to the parts by weight, then sodium hydroxide is added, the PH is adjusted to 6.5-7.5, and then the mixture is stirred for 1-3 hours at the temperature of 40-50 ℃, so that the environment-friendly concrete early strength agent is obtained.
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| CN104710128A (en) * | 2015-03-11 | 2015-06-17 | 东南大学 | Super early strength accelerator for portland cement concrete |
| CN106565969A (en) * | 2016-11-10 | 2017-04-19 | 江苏苏博特新材料股份有限公司 | Preparation method and application of organic and inorganic hybrid additive |
| CN106986572A (en) * | 2017-04-25 | 2017-07-28 | 北京工业大学 | A kind of method that concrete intensifier is prepared with dissaving polymer |
| CN108249845A (en) * | 2017-12-13 | 2018-07-06 | 镇江建科建设科技有限公司 | A kind of Organic-inorganic composite early strength agent and the self-compacting concrete prepared using the early strength agent |
| CN108503819A (en) * | 2018-04-26 | 2018-09-07 | 西南民族大学 | A kind of hyperbranched scale inhibition polymer and its preparation method and application |
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Application publication date: 20210212 |