Environment-friendly concrete water-reducing additive and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and discloses an environment-friendly concrete water-reducing additive and a preparation method thereof, the environment-friendly concrete water-reducing additive is prepared from the following components: an intercalation water-reducing compound, sodium citrate, 4-aminobenzene fucoside, isopropanol and methyl allyl polyoxyethylene ether; the prepared environment-friendly concrete water-reducing additive has excellent water-reducing performance, can be adsorbed on the surfaces of cement particles through adsorption and dispersion effects in concrete, enables the cement particles to carry the same charges, enables the cement particles to be better dispersed in a concrete mixture due to the fact that the charges of the same polarity repel each other, and meanwhile, the water-reducing performance of the concrete is improved. In addition, a layer of adsorption solvation water film can also be formed to wrap the surfaces of cement particles, the water film plays a lubricating role, in the concrete stirring process, the frictional resistance among the particles is reduced, the fluidity of a concrete mixture can be improved, and therefore the water consumption is reduced on the premise that the working performance of concrete is not changed, and the water reducing performance is excellent.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to an environmentally friendly concrete water-reducing additive and a preparation method thereof. Background Art

[0002] In recent years, with the continuous development of social production and life, various related buildings and infrastructure have also been continuously developed.

[0003] The main construction materials used for various buildings and infrastructure are engineering materials, and concrete is one of the indispensable engineering materials.

[0004] Concrete, referred to as "concrete", usually refers to cement as a gelling material, sand and stone as aggregates, concrete additives, and water in a certain proportion, mixed and mixed. Among them, concrete additives are an important component of concrete and one of the essential ingredients to ensure the excellent workability, strength and durability of concrete.

[0005] Water reducer is a kind of concrete additive, which is used to reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. The water reducing effect of water reducer for concrete prepared by existing technology is relatively general, which limits its application.

[0006] Based on this, we proposed an environmentally friendly concrete water-reducing additive. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly concrete water-reducing additive and a preparation method thereof.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: An environmentally friendly concrete water-reducing additive, comprising the following components by weight: 15-18 parts of intercalation water-reducing compound, 2-5 parts of sodium citrate, 1.5-1.8 parts of 4-aminophenyl fucoside, 5-8 parts of isopropanol, and 3.2-3.5 parts of methyl allyl polyoxyethylene ether; The weight ratio of the intercalated water-reducing complex and 4-aminophenylfucoside is 10:1.

[0009] As a further technical solution, the method for preparing the intercalated water-reducing composite comprises the following steps: Mixing ethanol and deionized water and stirring to obtain an ethanol solution; The volume ratio of ethanol to deionized water was 1:1; Sodium lignin sulfonate was added to the ethanol solution, the temperature was adjusted to 35°C, and the mixture was stirred for 40 minutes to obtain a composite solution; Mixing ethylenediamine and diethanolamine to obtain a mixture; The obtained mixture was added to the composite liquid, the temperature was adjusted to 85°C, the mixture was stirred in a water bath for 2 hours, glutaraldehyde was added dropwise, the mixture was stirred for 3 hours, and anhydrous ethanol 3 times the amount of the system was added for precipitation, and the mixture was centrifuged at high speed, filtered, and dried to obtain a preliminary water-reducing composite; The preliminary water-reducing composite is subjected to intercalation treatment to obtain an intercalated water-reducing composite.

[0010] As a further technical solution, the mixing ratio of the sodium lignin sulfonate and the ethanol solution is 12 g: 200 mL; The mass ratio of ethylenediamine to diethanolamine is 1:2.

[0011] As a further technical solution, the mass ratio of the mixture to the composite liquid is 3:1; The mass ratio of glutaraldehyde to the complex was 1:35; The high-speed centrifugation speed is 5500r / min and the time is 20min; The drying was performed in vacuum at 60°C for 4 hours.

[0012] As a further technical solution: the intercalation process is: First, anhydrous ethanol and deionized water were mixed in a volume ratio of 1:1 to obtain an isomeric ethanol solution; Add attapulgite powder to an equal amount of ethanol solution, then adjust the temperature to 40°C, and stir for 2 hours to obtain a mixed slurry; Add the preliminary water-reducing compound to the mixed slurry, adjust the temperature to 80°C, continue stirring for 4 hours, and then dry it by rotary evaporation.

[0013] As a further technical solution: the mixing ratio of the attapulgite powder and the ethanol solution is 10g:150mL.

[0014] As a further technical solution: the mixing ratio of the mixed slurry and the preliminary water-reducing compound is 150ml:12g.

[0015] A method for preparing an environmentally friendly concrete water-reducing additive, comprising: Weigh the following according to weight: intercalation water-reducing complex, sodium citrate, 4-aminophenylfucoside, isopropanol, methyl allyl polyoxyethylene ether; The components were added into a mixer in turn and mixed at high speed for 1 hour to obtain an environmentally friendly concrete water-reducing additive.

[0016] As a further technical solution: the high-speed mixing speed is 1200r / min; The stirring and mixing temperature was 60°C. Beneficial Effects

[0017] Compared with the prior art, the present invention provides an environmentally friendly concrete water-reducing additive, which has the following beneficial effects: The environmentally friendly concrete water-reducing additive prepared by the present invention has excellent water-reducing performance. Through the adsorption and dispersion effect in concrete, it can be adsorbed on the surface of cement particles, so that the cement particles carry the same charge. Since like charges repel each other, the cement particles can be better dispersed in the concrete mixture. At the same time, it can also form a layer of adsorbed solvated water film wrapped on the surface of the cement particles. This water film plays a lubricating role. During the concrete mixing process, the friction resistance between the particles is reduced, and the fluidity of the concrete mixture can be increased, thereby reducing the water consumption without changing the working performance of the concrete, and the water-reducing performance is excellent.

[0018] The present invention can significantly improve the dispersibility of concrete particles through the interaction of various components, especially the effect of the intercalated water-reducing compound, and after the introduction of the concrete water-reducing additive, the fluidity of the concrete becomes stronger and the slump is further improved accordingly.

[0019] The concrete water-reducing additive prepared by the present invention has a strong steric hindrance effect. Due to the hydrophilic side chains in the structure, it can extend in the aqueous solution, thereby forming a hydrophilic three-dimensional adsorption layer with a certain thickness on the surface of the adsorbed cement particles. When the cement particles are close to each other, the adsorption layers begin to overlap, that is, a steric hindrance effect is generated between the cement particles. The more overlaps there are, the greater the steric repulsion force is, and the greater the hindrance to the cohesion between the cement particles is, so that the slump of the concrete is maintained well. DETAILED DESCRIPTION

[0020] The following will be combined with 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 making creative work are within the scope of protection of the present invention. Example 1

[0021] A method for preparing an environmentally friendly concrete water-reducing additive, comprising: Weigh the following according to weight: 15 parts of intercalation water-reducing compound, 2 parts of sodium citrate, 1.5 parts of 4-aminophenylfucoside, 5 parts of isopropanol, and 3.2 parts of methyl allyl polyoxyethylene ether; The weight ratio of the intercalated water-reducing complex and 4-aminophenylfucoside is 10:1.

[0022] The method for preparing the intercalation water-reducing composite comprises the following steps: Mixing ethanol and deionized water and stirring to obtain an ethanol solution; The volume ratio of ethanol to deionized water was 1:1; Sodium lignin sulfonate was added to the ethanol solution, the temperature was adjusted to 35°C, and the mixture was stirred for 40 minutes to obtain a composite solution; Mixing ethylenediamine and diethanolamine to obtain a mixture; The obtained mixture was added to the composite liquid, the temperature was adjusted to 85°C, the mixture was stirred in a water bath for 2 hours, glutaraldehyde was added dropwise, the mixture was stirred for 3 hours, and anhydrous ethanol 3 times the amount of the system was added for precipitation, and the mixture was centrifuged at high speed, filtered, and dried to obtain a preliminary water-reducing composite; The preliminary water-reducing composite is subjected to intercalation treatment to obtain an intercalated water-reducing composite.

[0023] The mixing ratio of sodium lignin sulfonate and ethanol solution is 12g:200mL; The mass ratio of ethylenediamine to diethanolamine is 1:2.

[0024] The mass ratio of the mixture to the compound liquid is 3:1; The mass ratio of glutaraldehyde to the complex was 1:35; The high-speed centrifugation speed is 5500r / min and the time is 20min; The drying was performed in vacuum at 60°C for 4 hours.

[0025] The intercalation process is: First, anhydrous ethanol and deionized water were mixed in a volume ratio of 1:1 to obtain an isomeric ethanol solution; Add attapulgite powder to an equal amount of ethanol solution, then adjust the temperature to 40°C, and stir for 2 hours to obtain a mixed slurry; Add the preliminary water-reducing compound to the mixed slurry, adjust the temperature to 80°C, continue stirring for 4 hours, and then dry it by rotary evaporation.

[0026] The mixing ratio of attapulgite powder and ethanol solution is 10g:150mL.

[0027] The mixing ratio of the mixed slurry and the preliminary water-reducing compound is 150ml:12g; The components were added to the mixer in turn and mixed at high speed for 1 hour to obtain an environmentally friendly concrete water-reducing additive; the high-speed mixing speed was 1200 r / min; The stirring and mixing temperature was 60°C. Example 2

[0028] A method for preparing an environmentally friendly concrete water-reducing additive, comprising: Weigh the following according to weight: 17 parts of intercalation water-reducing compound, 3 parts of sodium citrate, 1.7 parts of 4-aminophenylfucoside, 6 parts of isopropanol, and 3.4 parts of methyl allyl polyoxyethylene ether; The weight ratio of the intercalated water-reducing complex and 4-aminophenylfucoside is 10:1.

[0029] The method for preparing the intercalation water-reducing composite comprises the following steps: Mixing ethanol and deionized water and stirring to obtain an ethanol solution; The volume ratio of ethanol to deionized water was 1:1; Sodium lignin sulfonate was added to the ethanol solution, the temperature was adjusted to 35°C, and the mixture was stirred for 40 minutes to obtain a composite solution; Mixing ethylenediamine and diethanolamine to obtain a mixture; The obtained mixture was added to the composite liquid, the temperature was adjusted to 85°C, the mixture was stirred in a water bath for 2 hours, glutaraldehyde was added dropwise, the mixture was stirred for 3 hours, and anhydrous ethanol 3 times the amount of the system was added for precipitation, and the mixture was centrifuged at high speed, filtered, and dried to obtain a preliminary water-reducing composite; The preliminary water-reducing composite is subjected to intercalation treatment to obtain an intercalated water-reducing composite.

[0030] The mixing ratio of sodium lignin sulfonate and ethanol solution is 12g:200mL; The mass ratio of ethylenediamine to diethanolamine is 1:2.

[0031] The mass ratio of the mixture to the compound liquid is 3:1; The mass ratio of glutaraldehyde to the complex was 1:35; The high-speed centrifugation speed is 5500r / min and the time is 20min; The drying was performed in vacuum at 60°C for 4 hours.

[0032] The intercalation process is: First, anhydrous ethanol and deionized water were mixed in a volume ratio of 1:1 to obtain an isomeric ethanol solution; Add attapulgite powder to an equal amount of ethanol solution, then adjust the temperature to 40°C, and stir for 2 hours to obtain a mixed slurry; Add the preliminary water-reducing compound to the mixed slurry, adjust the temperature to 80°C, continue stirring for 4 hours, and then dry it by rotary evaporation.

[0033] The mixing ratio of attapulgite powder and ethanol solution is 10g:150mL.

[0034] The mixing ratio of the mixed slurry and the preliminary water-reducing compound is 150ml:12g; The components were added to the mixer in turn and mixed at high speed for 1 hour to obtain an environmentally friendly concrete water-reducing additive; the high-speed mixing speed was 1200 r / min; The stirring and mixing temperature was 60°C. Example 3

[0035] A method for preparing an environmentally friendly concrete water-reducing additive, comprising: Weigh the following according to weight: 18 parts of intercalation water-reducing compound, 5 parts of sodium citrate, 1.8 parts of 4-aminophenylfucoside, 8 parts of isopropanol, and 3.5 parts of methyl allyl polyoxyethylene ether; The weight ratio of the intercalated water-reducing complex and 4-aminophenylfucoside is 10:1.

[0036] The method for preparing the intercalation water-reducing composite comprises the following steps: Mixing ethanol and deionized water and stirring to obtain an ethanol solution; The volume ratio of ethanol to deionized water was 1:1; Sodium lignin sulfonate was added to the ethanol solution, the temperature was adjusted to 35°C, and the mixture was stirred for 40 minutes to obtain a composite solution; Mixing ethylenediamine and diethanolamine to obtain a mixture; The obtained mixture was added to the composite liquid, the temperature was adjusted to 85°C, the mixture was stirred in a water bath for 2 hours, glutaraldehyde was added dropwise, the mixture was stirred for 3 hours, and anhydrous ethanol 3 times the amount of the system was added for precipitation, and the mixture was centrifuged at high speed, filtered, and dried to obtain a preliminary water-reducing composite; The preliminary water-reducing composite is subjected to intercalation treatment to obtain an intercalated water-reducing composite.

[0037] The mixing ratio of sodium lignin sulfonate and ethanol solution is 12g:200mL; The mass ratio of ethylenediamine to diethanolamine is 1:2.

[0038] The mass ratio of the mixture to the compound liquid is 3:1; The mass ratio of glutaraldehyde to the complex was 1:35; The high-speed centrifugation speed is 5500r / min and the time is 20min; The drying was performed in vacuum at 60°C for 4 hours.

[0039] The intercalation process is: First, anhydrous ethanol and deionized water were mixed in a volume ratio of 1:1 to obtain an isomeric ethanol solution; Add attapulgite powder to an equal amount of ethanol solution, then adjust the temperature to 40°C, and stir for 2 hours to obtain a mixed slurry; Add the preliminary water-reducing compound to the mixed slurry, adjust the temperature to 80°C, continue stirring for 4 hours, and then dry it by rotary evaporation.

[0040] The mixing ratio of attapulgite powder and ethanol solution is 10g:150mL.

[0041] The mixing ratio of the mixed slurry and the preliminary water-reducing compound is 150ml:12g; The components were added to the mixer in turn and mixed at high speed for 1 hour to obtain an environmentally friendly concrete water-reducing additive; the high-speed mixing speed was 1200 r / min; The stirring and mixing temperature was 60°C.

[0042] The following is a comparative example: Comparative Example 1: On the basis of Example 1, no intercalated water-reducing composite material is added, and the rest of the technical scheme is consistent with the technical scheme of Example 1.

[0043] Comparative Example 2: On the basis of Example 1, the intercalation treatment is not performed during the preparation of the intercalation water-reducing composite material, and the rest of the technical scheme is consistent with the technical scheme of Example 1.

[0044] test: The water reduction rate test of the water-reducing additives of the embodiment and the comparative example was carried out with reference to the specific requirements of JGJ56-1984 "Quality Standards and Test Methods for Concrete Water-Reducing Agents and Test Methods for Concrete Water-Reducing Agents", and 10 samples were tested in each group, and the results were averaged; the test results are shown in Table 1; Table 1

[0045] It can be seen from Table 1 that the concrete water-reducing additive prepared by the present invention has an excellent water-reducing effect.

[0046] Using Example 1 as the basic sample, the water-reducing performance of the concrete water-reducing additive was compared under different weights of the intercalated water-reducing composite; Table 2

[0047] It can be seen from Table 2 that with the increase in the weight of the intercalated water-reducing compound, the water-reducing performance of the concrete water-reducing additive first increases and then gradually remains unchanged.

[0048] The slump test of the concrete water-reducing additives of the embodiment and the comparative example was carried out with reference to the specific requirements of JGJ56-1984 "Quality Standards and Test Methods for Concrete Water-Reducing Agents Appendix C Test Methods for Concrete with Water-Reducing Agents C1 Slump and Slump Loss", and the comparison was carried out: Table 3

[0049] It can be seen from Table 3 that the slump of the concrete water-reducing additive of the present invention is relatively high.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly concrete water-reducing additive, characterized in that: The following ingredients are included by weight: 15-18 parts of intercalation water-reducing compound, 2-5 parts of sodium citrate, 1.5-1.8 parts of 4-aminophenyl fucoside, 5-8 parts of isopropanol, and 3.2-3.5 parts of methyl allyl polyoxyethylene ether; The weight ratio of the intercalated water-reducing complex and 4-aminophenylfucoside is 10:

1.

2. The environmentally friendly concrete water reducing additive according to claim 1, characterized in that: The method for preparing the intercalated water-reducing composite comprises the following steps: Mixing ethanol and deionized water and stirring to obtain an ethanol solution; The volume ratio of ethanol to deionized water was 1:1; Sodium lignin sulfonate was added to the ethanol solution, the temperature was adjusted to 35°C, and the mixture was stirred for 40 minutes to obtain a composite solution; Mixing ethylenediamine and diethanolamine to obtain a mixture; The obtained mixture was added to the composite liquid, the temperature was adjusted to 85°C, the mixture was stirred in a water bath for 2 hours, glutaraldehyde was added dropwise, the mixture was stirred for 3 hours, and anhydrous ethanol 3 times the amount of the system was added for precipitation, and the mixture was centrifuged at high speed, filtered, and dried to obtain a preliminary water-reducing composite; The preliminary water-reducing composite is subjected to intercalation treatment to obtain an intercalated water-reducing composite.

3. The environmentally friendly concrete water reducing additive according to claim 2, characterized in that: The mixing ratio of the sodium lignin sulfonate and the ethanol solution is 12 g: 200 mL; The mass ratio of ethylenediamine to diethanolamine is 1:

2.

4. The environmentally friendly concrete water reducing additive according to claim 2, characterized in that: The mass ratio of the mixture to the composite liquid is 3:1; The mass ratio of glutaraldehyde to the complex was 1:35; The high-speed centrifugation speed is 5500r / min and the time is 20min; The drying was performed in vacuum at 60°C for 4 hours.

5. The environmentally friendly concrete water reducing additive according to claim 2, characterized in that: The intercalation process is as follows: First, anhydrous ethanol and deionized water were mixed in a volume ratio of 1:1 to obtain an isomeric ethanol solution; Add attapulgite powder to an equal amount of ethanol solution, then adjust the temperature to 40°C, and stir for 2 hours to obtain a mixed slurry; Add the preliminary water-reducing compound to the mixed slurry, adjust the temperature to 80°C, continue stirring for 4 hours, and then dry it by rotary evaporation.

6. The environmentally friendly concrete water reducing additive according to claim 5, characterized in that: The mixing ratio of the attapulgite powder and the ethanol solution is 10g:150mL.

7. The environmentally friendly concrete water reducing additive according to claim 5, characterized in that: The mixing ratio of the mixed slurry and the preliminary water-reducing compound is 150 ml:12 g.

8. A method for preparing an environmentally friendly concrete water-reducing additive according to any one of claims 1 to 7, characterized in that: include: Weigh the following according to weight: intercalation water-reducing complex, sodium citrate, 4-aminophenylfucoside, isopropanol, methyl allyl polyoxyethylene ether; The components were added into a mixer in turn and mixed at high speed for 1 hour to obtain an environmentally friendly concrete water-reducing additive.

9. The method for preparing an environmentally friendly concrete water-reducing additive according to claim 8, characterized in that: The high-speed mixing speed is 1200r / min; The stirring and mixing temperature was 60°C.

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