CN113416091B

CN113416091B - Concrete curing agent

Info

Publication number: CN113416091B
Application number: CN202110755202.7A
Authority: CN
Inventors: 涂玲俐; 凃小良; 尹培民; 龙承峰; 李云; 阙小文; 曾令彰; 涂春明; 张伟; 曾建才; 邹隆华; 肖小华; 张培云
Original assignee: Jiangxi Shengyuan Commercial Concrete Co ltd
Current assignee: Jiangxi Shengyuan Commercial Concrete Co ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2022-07-12
Anticipated expiration: 2041-07-05
Also published as: CN113416091A

Abstract

The invention discloses a concrete curing agent which comprises, by mass, 20-40 parts of a high-molecular emulsion and 15-25 parts of a penetrant. The concrete curing agent provided by the invention can comprehensively improve the water retention rate, the surface strength and the wear resistance of concrete.

Description

Concrete curing agent

Technical Field

The invention belongs to the technical field of concrete curing, and particularly relates to a concrete curing agent.

Background

Concrete curing is a very important link in concrete construction. The strength of concrete comes from hydration of cement, and cement hydration can only occur in the capillary filled with water, so that conditions must be created to prevent water from evaporating and losing from the capillary, so that the cement can be fully hydrated to ensure that the strength of the concrete is continuously increased. Due to the limitations of traditional curing methods (covering wet gunny bags, wet straw bags and the like), chemical curing methods are mostly adopted at present, namely curing agents are smeared on the surface of newly poured concrete.

The concrete curing agent is also called concrete protective agent and concrete curing liquid, is a novel high-molecular preparation prepared by modern high technology, is a liquid film-forming compound with very wide adaptability, is convenient to use, is sprayed on the surface of concrete or mortar, can quickly form a colorless and waterproof film when moisture is evaporated to a certain degree, can prevent the moisture in the concrete or mortar from evaporating, and reduces the shrinkage and the cracking of the concrete.

The concrete curing agent mainly comprises the following types: (1) a paraffin wax emulsion; (2) silicate aqueous solution mainly containing water glass; (3) a solvent type resin solution. The paraffin emulsion has good water-retaining property but is not wear-resistant, the water glass-based curing agent has strong wear resistance but has poor water-retaining property, and the solvent type resin solution has good water-retaining property but is not environment-friendly enough and has unstable performance. The existing organic and inorganic compound curing agent often has the problem of poor compatibility.

To sum up, how to design a concrete curing agent can comprehensively improve the water retention rate, the surface strength and the wear resistance of concrete, and is a problem which needs to be solved urgently at present.

Disclosure of Invention

The invention aims to solve the technical problems, and provides a concrete curing agent which comprises a high-molecular emulsion and a penetrant, wherein the high-molecular emulsion can form a high-strength high-hardness waterproof organic film on the surface, the penetrant can effectively penetrate into the deep layer of concrete to promote the hydration process, and the water retention rate, the surface strength and the wear resistance of the concrete can be effectively improved by combining the high-molecular emulsion and the penetrant.

The concrete curing agent comprises, by mass, 20-40 parts of a polymer emulsion and 15-25 parts of a penetrant.

Further, the preparation method of the polymer emulsion comprises the following steps:

s1, mixing and melting paraffin and polyethylene wax, adding polyaryletherketone powder, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain superfine mixed granules;

s2, mixing sodium propylene sulfonate and 1/3 initiator to prepare a first reaction liquid, mixing vinyl acetate and 1/3 initiator to prepare a second reaction liquid, adding deionized water, sodium alkyl sulfonate and the rest 1/3 initiator into a reactor, uniformly mixing, adding the mixed granules obtained in the step S1, adjusting the temperature and stirring parameters of the reactor, simultaneously introducing ethylene, the first reaction liquid and the second reaction liquid, reacting for 6-8 hours, and collecting a reaction product;

s3, mixing the reaction product obtained in the step S2 with polyvinyl alcohol, adding the mixture into a high-speed dispersion machine, and uniformly dispersing to obtain the high-molecular emulsion.

Further, the mass ratio of the paraffin to the polyethylene wax to the polyaryletherketone powder is 1: (0.1-0.3): (0.4-0.6), wherein the mass ratio of the ethylene to the vinyl acetate to the sodium propylene sulfonate is 1: (0.05-0.1): (0.03-0.08), the ratio of the total mass of the paraffin, the polyethylene wax and the polyaryletherketone powder to the total mass of the ethylene, the vinyl acetate and the sodium propylene sulfonate, the mass of the deionized water and the mass of the polyvinyl alcohol is 1: (0.4-0.6): (1.5-2): (0.1-0.2).

Further, in step S2, the initiator is dimethyl azodiisobutyrate, and the addition amount thereof is 0.2-0.5% of the total mass of ethylene, vinyl acetate and sodium propylene sulfonate, and the addition amount of the sodium alkyl sulfonate is 0.8-1% of the deionized water.

Further, in step S1, the temperature for melting the mixture of paraffin wax and polyethylene wax is 120-130 ℃, the temperature for extruding the double screw is 330-340 ℃, the particle size of the ultrafine mixed particles is 0.1-0.6 μm, and in step S2, the temperature parameter of the reactor is 80-90 ℃, and the stirring parameter is 200-400 r/min.

Further, the raw materials for preparing the penetrant comprise 5-10 parts of sodium silicate, 20-30 parts of carboxymethyl cellulose gel particles, 0.1-0.3 part of retarder and 50-60 parts of deionized water, wherein the materials for preparing the carboxymethyl cellulose gel particles comprise 1-3 parts of lignin, 8-12 parts of barite powder, 50-60 parts of carboxymethyl cellulose sodium salt powder, 8-15 parts of aluminum sulfate powder and 5-10 parts of ferric sulfate powder.

Further, the preparation method of the carboxymethyl cellulose gel particle comprises the following steps:

A. heating and melting lignin, spraying the lignin onto the surface of barite powder by using a spray gun, and cooling and drying at normal temperature to obtain lignin-barite powder;

B. dissolving sodium carboxymethyl cellulose powder in deionized water to prepare sodium carboxymethyl cellulose solution, and then respectively dissolving aluminum sulfate and ferric sulfate powder in deionized water to prepare aluminum sulfate and ferric sulfate mixed solution;

C. dropwise adding a sodium carboxymethylcellulose solution into a mixed solution of aluminum sulfate and ferric sulfate, heating to 70-90 ℃, cooling to 30-40 ℃ after the sodium carboxymethylcellulose solution is dropwise added, standing for 30-50min, adding lignin-barite powder, stirring uniformly, continuously cooling to 5-10 ℃, standing for 1-2h, and carrying out suction filtration and shaping by using a distributed funnel to obtain a carboxymethyl cellulose gel sphere;

D. adding the carboxymethyl cellulose gel balls into 5-10 times of deionized water, then placing the mixture into a high-speed shearing machine to be sheared into particles with the particle size of 10-100 mu m, and then introducing the particles into a microfluid homogenizer to be homogenized to obtain the carboxymethyl cellulose gel particles.

Further, the heating and melting temperature of the lignin in the step A is 170-; in the step B, the mass concentration of the sodium carboxymethylcellulose solution is 2-3%, and the mass concentration of the aluminum sulfate and ferric sulfate mixed solution is 4-5%; c, dripping the sodium carboxymethyl cellulose solution for 30-40 min; the speed of the high-speed shearing machine in the step D is 700-.

The invention also provides a construction method of the concrete curing agent, which comprises the following concrete steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, and after the surface is semi-dried, spraying a high-molecular emulsion; wherein the dosage of the concrete curing agent is 0.18-0.22kg/m³。

The invention also provides another construction method of the concrete curing agent, which comprises the following concrete steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, spraying a boric acid aqueous solution after the surface is half-dried, then immediately spraying 1/4-1/2 high polymer emulsion, and after the surface is half-dried, spraying the rest 1/2-3/4 high polymer emulsion;

wherein the dosage of the concrete curing agent is 0.18-0.22kg/m³The mass concentration of the boric acid aqueous solution is 2-3%, and the spraying amount of the boric acid aqueous solution is 4-6% of the concrete curing agent.

The invention has the beneficial effects that:

(1) the concrete curing agent comprises the high-molecular emulsion and the penetrant, wherein the high-molecular emulsion can form a high-strength high-hardness waterproof organic film on the surface, the penetrant can effectively penetrate into the deep layer of concrete to promote the hydration process, and the combination of the two can effectively improve the curing effect of the concrete;

(2) according to the invention, when the high-molecular emulsion is prepared, ethylene, vinyl acetate and sodium propylene sulfonate are used as monomers, and paraffin wax, polyethylene wax and polyaryletherketone powder superfine mixed granules are used as matrixes to carry out emulsion polymerization in water, so that the components of the finally obtained high-molecular emulsion can be tightly combined, a compact, high-strength and high-hardness film can be formed on the surface of concrete, and the water retention rate, strength and wear resistance of the concrete curing agent are improved;

(3) because the hardness and strength of the paraffin are not enough, and the maintenance effect is influenced, when the high-molecular emulsion is prepared, the paraffin, the high-hardness polyethylene wax and the high-strength polyaryletherketone are compounded to form a matrix of the modified paraffin emulsion, so that the high-molecular emulsion can form a high-strength and high-hardness film on the surface of concrete, and the strength and the wear resistance of the concrete can be obviously improved;

(4) when the high-molecular emulsion is prepared, in the emulsion polymerization process, ethylene, vinyl acetate and sodium propylene sulfonate are used as monomers, the ethylene component can improve the hardness, the vinyl acetate enhances the toughness, and the film forming property is good, the sodium propylene sulfonate not only participates in the emulsion polymerization reaction, but also contains anionic groups with emulsification, and simultaneously promotes the emulsification and the polymerization reaction, so that the emulsion product is more stable;

(5) when the high-molecular emulsion is prepared, the polyvinyl alcohol is added for high-speed dispersion, so that the film forming property of the emulsion is improved, and the problem that the film is difficult to form due to more particles in the emulsion is solved;

(6) the penetrant contains sodium silicate and carboxymethyl cellulose gel particles, the sodium silicate can quickly permeate into concrete and coagulate, and the carboxymethyl cellulose gel particles can smoothly flow to deep pores of the concrete due to the softness and fluidity of gel, and then release aluminum ions, iron ions and sulfate ions in the gel to promote hydration reaction in the concrete, so that the surface strength and the wear resistance of the concrete are improved;

(7) according to the invention, when the carboxymethyl cellulose gel particles are prepared, the barite powder is introduced, so that the weight of the gel particles is increased, and the penetration speed of the carboxymethyl cellulose gel particles in concrete pores is faster and the range is deeper;

(8) according to the invention, when the carboxymethyl cellulose gel particles are prepared, the surface of the barite powder is coated with lignin to prepare lignin-barite powder, and the lignin contains a plurality of negative electricity radicals, so that iron and aluminum cations can be gathered on the surface of the lignin-barite powder when the lignin-barite powder participates in the preparation process of the carboxymethyl cellulose gel, a large amount of gel is formed around the lignin-barite powder, and the dispersion stability of the lignin-barite powder in the gel is promoted;

(9) the penetrating agent is also introduced with the retarder, so that the penetrating agent is prevented from being hydrated too fast after being contacted with concrete, the flow of carboxymethyl cellulose gel particles is restrained, and the retarder is required to be added to slow down the hydration rate;

(10) the invention provides a construction method of a concrete curing agent, wherein the penetrant contains water glass, so that the penetrant has certain viscosity when being sprayed on the surface of concrete and is semi-dry, and then the high-molecular emulsion is sprayed, so that the viscosity between a permeable layer formed by the penetrant and an organic film formed by the high-molecular emulsion can be promoted, and the curing and water retention effects are enhanced;

(11) the invention also provides another construction method of the concrete curing agent, after the penetrant is sprayed to the surface and semi-dried, the boric acid solution is sprayed, part of the boric acid solution reacts with the sodium silicate in the penetrant to be solidified, then the high polymer emulsion is sprayed immediately, and part of the polyvinyl alcohol in the high polymer emulsion can be quickly gelated with the boric acid solution, so that the viscosity between a permeable layer formed by the concrete curing agent and an organic film is effectively enhanced, and the curing and water-retaining effects of the concrete curing agent are enhanced.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The embodiment provides a concrete curing agent which comprises, by mass, 20 parts of a polymer emulsion and 15 parts of a penetrant.

The preparation method of the polymer emulsion comprises the following steps:

s1, mixing and melting paraffin wax and polyethylene wax, adding polyaryletherketone powder, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain superfine mixed granules;

s2, mixing sodium propylene sulfonate and 1/3 initiator to prepare a first reaction solution, mixing vinyl acetate and 1/3 initiator to prepare a second reaction solution, adding deionized water, sodium alkylsulfonate and the rest 1/3 initiator into a reactor, uniformly mixing, adding the mixed granules obtained in the step S1, adjusting the temperature and stirring parameters of the reactor, simultaneously introducing ethylene, the first reaction solution and the second reaction solution, reacting for 6-8 hours, and collecting a reaction product;

The mass ratio of the paraffin to the polyethylene wax to the polyaryletherketone powder is 1: 0.1: 0.4, the mass ratio of ethylene to vinyl acetate to sodium propylene sulfonate is 1: 0.05: 0.03, wherein the ratio of the total mass of the paraffin, the polyethylene wax and the polyaryletherketone powder to the total mass of the ethylene, the vinyl acetate and the sodium propylene sulfonate to the mass of the deionized water and the polyvinyl alcohol is 1: 0.4: 1.5: 0.1.

in step S2, the initiator is dimethyl azodiisobutyrate, the amount of which is 0.2% of the total mass of ethylene, vinyl acetate and sodium allylsulfonate, and the amount of which is 0.8% of deionized water.

In step S1, the temperature for melting the mixture of paraffin wax and polyethylene wax is 120 ℃, the temperature for extruding the double screw is 330 ℃, the particle size of the superfine mixed granules is 0.1 μm, and in step S2, the temperature parameter of the reactor is 80 ℃ and the stirring parameter is 200 r/min.

The embodiment also provides a construction method of the concrete curing agent, which comprises the following specific steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, and after the surface is semi-dried, spraying a high-molecular emulsion; wherein the dosage of the concrete curing agent is 0.18kg/m³。

Example 2

The preparation raw materials of the penetrant comprise 5 parts of sodium silicate, 20 parts of carboxymethyl cellulose gel particles, 0.1 part of retarder and 50 parts of deionized water, and the preparation materials of the carboxymethyl cellulose gel particles comprise 1 part of lignin, 8 parts of barite powder, 50 parts of carboxymethyl cellulose sodium salt powder, 8 parts of aluminum sulfate powder and 5 parts of ferric sulfate powder.

The preparation method of the carboxymethyl cellulose gel particles comprises the following steps:

B. dissolving sodium carboxymethyl cellulose powder in deionized water to prepare sodium carboxymethyl cellulose solution, and then respectively dissolving aluminum sulfate powder and ferric sulfate powder in deionized water to prepare mixed solution of aluminum sulfate and ferric sulfate;

C. dropwise adding a sodium carboxymethylcellulose solution into a mixed solution of aluminum sulfate and ferric sulfate, heating to 70 ℃, cooling to 30 ℃ after the sodium carboxymethylcellulose solution is dropwise added, standing for 30min, adding lignin-barite powder, stirring uniformly, continuously cooling to 5 ℃, standing for 1h, and carrying out suction filtration and shaping by using a distributed funnel to obtain a carboxymethyl cellulose gel sphere;

D. adding the carboxymethyl cellulose gel balls into deionized water in an amount which is 5 times that of the carboxymethyl cellulose gel balls, then placing the carboxymethyl cellulose gel balls into a high-speed shearing machine to be sheared into particles with the diameter of 10 mu m, and then introducing the particles into a micro-jet homogenizer to be homogenized to obtain the carboxymethyl cellulose gel particles.

In the step A, the heating and melting temperature of the lignin is 170 ℃, and the ejection quantity of a spray gun is 0.3 mL/s; in the step B, the mass concentration of the sodium carboxymethylcellulose solution is 2%, and the mass concentration of the aluminum sulfate and ferric sulfate mixed solution is 4%; c, dripping the sodium carboxymethyl cellulose solution for 30 min; and D, the speed of the high-speed shearing machine is 700r/min, the homogenizing pressure of the micro-jet homogenizer is 1500bar, and the rotating speed is 800 r/min.

The invention also provides a construction method of the concrete curing agent, which comprises the following concrete steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, and after the surface is semi-dried, spraying a high-molecular emulsion; wherein the dosage of the concrete curing agent is 0.2kg/m³。

Example 3

This example is a combination of examples 1 and 2, wherein the amount of the concrete curing agent is 0.22kg/m³。

Example 4

The embodiment also provides another construction method of the concrete curing agent, which comprises the following specific steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, after the surface is half-dried, spraying a boric acid aqueous solution, then immediately spraying 1/4 high polymer emulsion, after the surface is half-dried, spraying the rest 3/4 high polymer emulsion;

wherein the dosage of the concrete curing agent is 0.18kg/m³The mass concentration of the boric acid aqueous solution is 2 percent, and the spraying amount of the boric acid aqueous solution is 6 percent of the concrete curing agent.

The rest is the same as in example 3.

Example 5

The embodiment provides a concrete curing agent which comprises, by mass, 30 parts of a polymer emulsion and 20 parts of a penetrant.

The preparation method of the polymer emulsion comprises the following steps:

The mass ratio of the paraffin to the polyethylene wax to the polyaryletherketone powder is 1: 0.2: 0.5, the mass ratio of ethylene to vinyl acetate to sodium propylene sulfonate is 1: 0.07: 0.05, wherein the ratio of the total mass of the paraffin, the polyethylene wax and the polyaryletherketone powder to the total mass of the ethylene, the vinyl acetate and the sodium propylene sulfonate to the mass of the deionized water and the polyvinyl alcohol is 1: 0.5: 1.75: 0.15.

in step S2, the initiator is dimethyl azodiisobutyrate, the amount of which added is 0.35% of the total mass of ethylene, vinyl acetate and sodium propylene sulfonate, and the amount of added sodium alkyl sulfonate is 0.9% of deionized water.

In step S1, the temperature for melting the mixture of paraffin wax and polyethylene wax is 125 ℃, the temperature for extruding the double screw is 335 ℃, the particle size of the superfine mixed granules is 0.35 μm, and in step S2, the temperature parameter of the reactor is 85 ℃ and the stirring parameter is 300 r/min.

The preparation raw materials of the penetrant comprise 7.5 parts of sodium silicate, 25 parts of carboxymethyl cellulose gel particles, 0.2 part of retarder and 55 parts of deionized water, and the preparation materials of the carboxymethyl cellulose gel particles comprise 2 parts of lignin, 10 parts of barite powder, 55 parts of carboxymethyl cellulose sodium salt powder, 11.5 parts of aluminum sulfate powder and 7.5 parts of ferric sulfate powder.

C. dropwise adding a sodium carboxymethylcellulose solution into a mixed solution of aluminum sulfate and ferric sulfate, heating to 80 ℃, cooling to 35 ℃ after the sodium carboxymethylcellulose solution is dropwise added, standing for 40min, adding lignin-barite powder, stirring uniformly, continuously cooling to 7 ℃, standing for 1.5h, and carrying out suction filtration and shaping by using a distributed funnel to obtain the carboxymethyl cellulose gel balls;

D. adding the carboxymethyl cellulose gel spheres into deionized water in an amount which is 7.5 times that of the carboxymethyl cellulose gel spheres, then placing the carboxymethyl cellulose gel spheres into a high-speed shearing machine to be sheared into particles with the diameter of 55 mu m, and then introducing the particles into a micro-jet homogenizer to be homogenized to obtain carboxymethyl cellulose gel particles.

In the step A, the heating and melting temperature of the lignin is 180 ℃, and the ejection quantity of a spray gun is 0.4 mL/s; in the step B, the mass concentration of the sodium carboxymethylcellulose solution is 2.5 percent, and the mass concentration of the aluminum sulfate and ferric sulfate mixed solution is 4.5 percent; c, dripping the sodium carboxymethyl cellulose solution for 35 min; and D, the speed of the high-speed shearing machine is 750r/min, the homogenizing pressure of the micro-jet homogenizer is 1650bar, and the rotating speed is 850 r/min.

The concrete curing agent construction method in the embodiment specifically comprises the following steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, after the surface is half-dried, spraying a boric acid aqueous solution, then immediately spraying 3/8 high polymer emulsion, after the surface is half-dried, spraying the rest 5/8 high polymer emulsion;

wherein the dosage of the concrete curing agent is 0.2kg/m³Quality of aqueous boric acid solutionThe amount concentration is 2.5%, and the spraying amount is 5% of the concrete curing agent.

Example 6

The embodiment provides a concrete curing agent which comprises, by mass, 40 parts of a polymer emulsion and 25 parts of a penetrant.

The preparation method of the polymer emulsion comprises the following steps:

The mass ratio of the paraffin to the polyethylene wax to the polyaryletherketone powder is 1: 0.3: 0.6, wherein the mass ratio of ethylene to vinyl acetate to sodium propylene sulfonate is 1: 0.1: 0.08, the ratio of the total mass of the paraffin, the polyethylene wax and the polyaryletherketone powder to the total mass of the ethylene, the vinyl acetate and the sodium propylene sulfonate to the mass of the deionized water and the polyvinyl alcohol is 1: 0.6: 2: 0.2.

in step S2, the initiator is dimethyl azodiisobutyrate, the amount of which is 0.5% of the total mass of ethylene, vinyl acetate, and sodium propylene sulfonate, and the amount of which is 1% of the deionized water.

In step S1, the temperature for melting the mixture of paraffin wax and polyethylene wax is 130 ℃, the temperature for extruding the double screw is 340 ℃, the particle size of the superfine mixed granules is 0.6 μm, and in step S2, the temperature parameter of the reactor is 90 ℃ and the stirring parameter is 400 r/min.

The preparation raw materials of the penetrant comprise 10 parts of sodium silicate, 30 parts of carboxymethyl cellulose gel particles, 0.3 part of retarder and 60 parts of deionized water, and the preparation materials of the carboxymethyl cellulose gel particles comprise 3 parts of lignin, 12 parts of barite powder, 60 parts of carboxymethyl cellulose sodium salt powder, 15 parts of aluminum sulfate powder and 10 parts of ferric sulfate powder.

C. dropwise adding a sodium carboxymethylcellulose solution into a mixed solution of aluminum sulfate and ferric sulfate, heating to 90 ℃, cooling to 40 ℃ after the sodium carboxymethylcellulose solution is dropwise added, standing for 50min, adding lignin-barite powder, stirring uniformly, continuously cooling to 10 ℃, standing for 2h, and carrying out suction filtration and shaping by using a distributed funnel to obtain a carboxymethyl cellulose gel ball;

D. adding the carboxymethyl cellulose gel balls into 10 times of deionized water, then placing the mixture into a high-speed shearing machine to be sheared into particles with the particle size of 100 mu m, and then introducing the particles into a micro-jet homogenizer to be homogenized to obtain the carboxymethyl cellulose gel particles.

In the step A, the heating and melting temperature of the lignin is 190 ℃, and the ejection quantity of a spray gun is 0.5 mL/s; in the step B, the mass concentration of the sodium carboxymethylcellulose solution is 3%, and the mass concentration of the aluminum sulfate and ferric sulfate mixed solution is 5%; c, dripping the sodium carboxymethyl cellulose solution for 40 min; and D, the speed of the high-speed shearing machine is 800r/min, the homogenizing pressure of the micro-jet homogenizer is 1800bar, and the rotating speed is 900 r/min.

The concrete curing agent construction method in the embodiment specifically comprises the following steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, after the surface is half-dried, spraying a boric acid aqueous solution, then immediately spraying 1/2 high polymer emulsion, after the surface is half-dried, spraying the rest 1/2 high polymer emulsion;

wherein the dosage of the concrete curing agent is 0.22kg/m³The mass concentration of the boric acid aqueous solution is 3 percent, and the spraying amount of the boric acid aqueous solution is 4 percent of the concrete curing agent.

Comparative example 1

This comparative example differs from example 4 in that the polymer emulsion is a normal paraffin wax emulsion.

Comparative example 2

This comparative example is different from example 4 in that polyethylene wax is not included in the raw materials for preparing the polymer emulsion.

Comparative example 3

The difference between the comparative example and example 4 is that polyaryletherketone powder is not included in the raw materials for preparing the polymer emulsion.

Comparative example 4

The comparative example is different from example 4 in that sodium propylene sulfonate is not included in the raw materials for preparing the polymer emulsion, and in this case, step S2 in the method for preparing the polymer emulsion is: mixing vinyl acetate and 1/2 initiator to prepare reaction liquid, adding deionized water, sodium alkyl sulfonate and the rest 1/2 initiator into a reactor, uniformly mixing, then adding the mixed granules obtained in the step S1, adjusting the temperature and stirring parameters of the reactor, simultaneously introducing the ethylene and the reaction liquid, reacting for 6-8h, and collecting reaction products.

Comparative example 5

This comparative example is different from example 4 in that polyvinyl alcohol is not included in the raw materials for preparing the polymer emulsion.

Comparative example 6

The difference between the comparative example and the example 4 is that the mass ratio of the paraffin, the polyethylene wax and the polyaryletherketone powder is 1: 0.08: 0.4.

comparative example 7

The difference between the comparative example and the example 4 is that the mass ratio of the paraffin, the polyethylene wax and the polyaryletherketone powder is 1: 0.35: 0.4.

comparative example 8

The difference between the comparative example and the example 4 is that the mass ratio of the paraffin, the polyethylene wax and the polyaryletherketone powder is 1: 0.1: 0.35.

comparative example 9

The difference between the comparative example and the example 4 is that the mass ratio of the paraffin, the polyethylene wax and the polyaryletherketone powder is 1: 0.1: 0.65.

comparative example 10

The difference between the comparative example and the example 4 is that the mass ratio of the ethylene to the vinyl acetate to the sodium propylene sulfonate is 1: 0.04: 0.03.

comparative example 11

The difference between the comparative example and the example 4 is that the mass ratio of the ethylene to the vinyl acetate to the sodium propylene sulfonate is 1: 0.11: 0.03.

comparative example 12

The difference between the comparative example and the example 4 is that the mass ratio of the ethylene to the vinyl acetate to the sodium propylene sulfonate is 1: 0.05: 0.02.

comparative example 13

The difference between the comparative example and the example 4 is that the mass ratio of the ethylene to the vinyl acetate to the sodium propylene sulfonate is 1: 0.05: 0.09.

comparative example 14

The difference between this comparative example and example 4 is that step S1 in the method for preparing the polymer emulsion is: mixing and melting paraffin, polyethylene wax and polyaryletherketone powder, extruding by a double-screw extruder, and granulating to obtain superfine mixed granules. The temperature of the mixture and the melt at this time is 350 ℃ or higher.

Comparative example 15

The difference between this comparative example and example 4 is that step S2 in the method for preparing the polymer emulsion is: mixing sodium propylene sulfonate and 1/3 initiator to prepare a first reaction solution, adding deionized water, vinyl acetate, sodium alkyl sulfonate and the rest of 2/3 initiator into a reactor, uniformly mixing, then adding the mixed granules obtained in the step S1, adjusting the temperature and stirring parameters of the reactor, simultaneously introducing ethylene and the first reaction solution, reacting for 6-8h, and collecting a reaction product.

Comparative example 16

The difference between this comparative example and example 4 is that step S2 in the preparation method of the polymer emulsion is: adding deionized water, sodium propylene sulfonate, vinyl acetate and sodium alkyl sulfonate into a reactor, uniformly mixing, then adding the mixed granules obtained in the step S1, adjusting the temperature and stirring parameters of the reactor, simultaneously introducing ethylene and an initiator, reacting for 6-8h, and collecting a reaction product.

Comparative example 17

This comparative example is different from example 4 in that the temperature parameter of the reactor in step S2 in the method for preparing a polymer emulsion was 78 ℃.

Comparative example 18

This comparative example is different from example 4 in that the temperature parameter of the reactor in step S2 in the method for preparing a polymer emulsion was 92 ℃.

Comparative example 19

This comparative example differs from example 4 in that sodium alkyl sulfonate was added in an amount of 0.7% based on deionized water in step S2.

Comparative example 20

This comparative example is different from example 4 in that sodium alkylsulfonate is added in an amount of 1.1% based on deionized water in step S2.

Comparative example 21

This comparative example differs from example 5 in that the starting material for the preparation of the penetrant does not include carboxymethyl cellulose gel particles.

Comparative example 22

This comparative example is different from example 5 in that the carboxymethylcellulose gel particles as the starting material for the preparation of the penetrant are 18 parts.

Comparative example 23

This comparative example is different from example 5 in that 32 parts of carboxymethylcellulose gel particles as a raw material for the preparation of the penetrant.

Comparative example 24

The present comparative example differs from example 5 in that carboxymethylcellulose gel particles were changed to alginic acid gel particles in the starting material for the preparation of the osmotic agent, and in this case, carboxymethylcellulose sodium salt powder in the starting material for the preparation of the gel particles was changed to sodium alginate powder.

Comparative example 25

The present comparative example is different from example 5 in that carboxymethyl cellulose gel particles are changed to chitosan gel particles in the raw material for the preparation of the penetrant, and at this time, carboxymethyl cellulose sodium salt powder in the raw material for the preparation of the gel particles is changed to chitosan.

Comparative example 26

This comparative example differs from example 5 in that the raw materials for the preparation of the penetrant do not include a retarder.

Comparative example 27

This comparative example differs from example 5 in that the amount of the retarder in the starting material for the preparation of the penetrant was 0.08 part.

Comparative example 28

This comparative example differs from example 5 in that the amount of the retarder in the starting material for the preparation of the penetrant was 0.32 part.

Comparative example 29

The present comparative example is different from example 5 in that the preparation material of the carboxymethyl cellulose gel particles does not include lignin, the preparation method thereof does not include step a, and the lignin-barite powder in the remaining steps is changed to barite powder.

Comparative example 30

The present comparative example is different from example 5 in that the preparation material of the carboxymethyl cellulose gel particles does not include the blanc fixe, the preparation method thereof does not include step a, and the lignin-blanc fixe in the remaining steps is changed to lignin.

Comparative example 31

The present comparative example differs from example 5 in that the preparation method of carboxymethyl cellulose gel particles, step a, is: and uniformly mixing the lignin and the barite powder, and drying to obtain the lignin-barite powder.

Comparative example 32

This comparative example differs from example 5 in that the preparation of carboxymethyl cellulose gel particles is carried out in step C: dropwise adding the sodium carboxymethyl cellulose solution into the mixed solution of aluminum sulfate and ferric sulfate, heating to 80 ℃, adding lignin-barite powder after the sodium carboxymethyl cellulose solution is dropwise added, uniformly stirring, cooling to 7 ℃, standing for 1.5h, and carrying out suction filtration and sizing by using a cloth-type funnel to obtain the carboxymethyl cellulose gel balls.

Comparative example 33

This comparative example differs from example 5 in that the preparation of carboxymethyl cellulose gel particles is carried out in step C: uniformly mixing the mixed solution of aluminum sulfate and ferric sulfate with the lignin-barite powder, then dropwise adding the sodium carboxymethyl cellulose solution, heating to 80 ℃, cooling to 35 ℃ after the sodium carboxymethyl cellulose solution is dropwise added, standing for 40min, stirring uniformly, continuously cooling to 7 ℃, standing for 1.5h, and carrying out suction filtration and shaping by using a cloth-type funnel to obtain the carboxymethyl cellulose gel balls.

Comparative example 34

This comparative example differs from example 5 in that the method for producing carboxymethyl cellulose gel beads does not include step D, and the raw material for producing the penetrant is carboxymethyl cellulose gel beads.

Comparative example 35

This comparative example differs from example 5 in that the preparation of carboxymethyl cellulose gel particles, step D, does not: adding the carboxymethyl cellulose gel balls into deionized water in an amount which is 7.5 times that of the carboxymethyl cellulose gel balls, then placing the carboxymethyl cellulose gel balls into a high-speed shearing machine to be sheared into particles with the diameter of 5 mu m, and then introducing the particles into a micro-jet homogenizer to be homogenized to obtain the carboxymethyl cellulose gel particles.

Comparative example 36

This comparative example differs from example 5 in that the preparation of carboxymethyl cellulose gel particles, step D, does not: adding the carboxymethyl cellulose gel balls into deionized water in an amount which is 7.5 times that of the carboxymethyl cellulose gel balls, then placing the carboxymethyl cellulose gel balls into a high-speed shearing machine to be sheared into particles with the diameter of 105 mu m, and then introducing the particles into a micro-jet homogenizer to be homogenized to obtain the carboxymethyl cellulose gel particles.

Comparative example 37

The difference between the comparative example and the example 3 is that the concrete curing agent construction method comprises the following specific steps: and after the surface of the concrete is dried, spraying the penetrant on the surface of the concrete, and after the surface is dried, spraying the high-molecular emulsion.

Comparative example 38

The difference between the comparative example and the example 6 is that the concrete curing agent construction method comprises the following specific steps: after the surface of the concrete is dried, spraying the penetrant on the surface of the concrete, spraying boric acid aqueous solution after the surface is half-dried, and then immediately spraying the high-molecular emulsion.

Comparative example 39

The comparative example is different from example 6 in that the construction method of the concrete curing agent is such that the mass concentration of the boric acid aqueous solution is 3% and the sprayed amount thereof is 3.5% of the concrete curing agent.

Comparative example 40

The comparative example is different from example 6 in that the construction method of the concrete curing agent has a boric acid aqueous solution with a mass concentration of 3% and a spraying amount of 6.5% of the concrete curing agent.

First, the basic performance parameters of the concrete curing agent of the invention

The concrete curing agents prepared in examples 1-6 of the present invention were added to cement (P. O42.5 portland cement) according to the corresponding construction methods, and the basic properties of the concrete were measured according to the method specified in the industry standard of "cement concrete curing agents" (JC 901-:

TABLE 1

The results in table 1 show that the concrete curing agents designed in examples 1 to 6 of the present invention can meet the standards of the qualified products in terms of effective water retention rate, compressive strength ratio and abrasion loss, and can be used for curing concrete.

Among them, examples 4 to 6 have the best maintenance effect, and the indexes thereof not only reach the first-class product standard, but also have the effective water retention rate of more than 96%, the compressive strength ratios of 7d and 28d of more than 112% and 119%, respectively, and the abrasion loss of less than 0.5 kg/m2, thus showing excellent maintenance effect.

As can be seen from the comparison of examples 1 to 3, the concrete curing agent prepared by combining the polymer emulsion and the penetrant can comprehensively improve the concrete curing effect. As can be seen from the comparison between the embodiments 3 and 4, in the construction process of the concrete curing agent, the operation of spraying the boric acid aqueous solution is added between the operations of spraying the penetrant and the polymer emulsion, so that the curing effect can be obviously improved.

Comparison of Performance parameters of concrete curing Agents of comparative examples 1 to 36

The concrete curing agents prepared in comparative examples 1 to 36 of the present invention were added to cement (P & lt. O42.5 ordinary portland cement) according to the corresponding construction method, and the basic properties of the concrete were measured according to the method specified in the Industrial Standard of Cement concrete curing agent (JC 901 & lt 2002), and the results are shown in Table 2:

TABLE 2

As is clear from the results in Table 2, the concrete curing agents prepared in comparative examples 1 to 36 were less effective in water retention, compressive strength ratio and abrasion loss than those of examples 4 to 6 of the present invention.

Wherein, the comparison example 1 changes the macromolecule emulsion into the common paraffin emulsion, and the effective water retention rate, the compressive strength ratio and the abrasion loss are all obviously reduced, which shows that the macromolecule emulsion designed by the invention greatly improves the curing effect of the concrete curing agent after being improved on the basis of the paraffin emulsion.

Compared with example 4, comparative examples 2-20 changed the raw materials and method for preparing the polymer emulsion, respectively, and as a result, the effective water retention rate, the compressive strength ratio, and the abrasion loss were reduced to different degrees, which indicates that only the polymer emulsion prepared strictly according to the method of the present invention can effectively improve the curing effect of the concrete curing agent.

Compared with the example 5, the raw materials for preparing the penetrant are respectively changed in the comparative examples 21 to 28, and the raw materials for preparing the carboxymethyl cellulose gel particles in the penetrant and the method are respectively changed in the comparative examples 29 to 36, so that the effective water retention rate, the compressive strength ratio and the abrasion loss are reduced to different degrees, which shows that the curing effect of the concrete curing agent can be effectively improved only by the penetrant prepared strictly according to the method of the present invention.

Influence of concrete curing agent construction method on water retention rate

Comparative examples 37 to 40 the construction method of the concrete curing agent was adjusted, and the concrete curing agent of the present invention was constructed according to the construction method of comparative examples 37 to 40 according to the above-mentioned method for measuring water retention, and the water retention of concrete was measured as shown in table 3:

TABLE 3

As is clear from the comparison between example 3 and comparative example 37, in the construction method of the curing agent of the present invention, the penetrant is sprayed on the surface of the concrete, and the polymer emulsion is sprayed after the surface is half-dried, and the half-dried penetrant (water-containing glass) has a certain viscosity, and then the polymer emulsion is sprayed, so that the viscosity between the permeation layer formed by the penetrant and the organic film formed by the polymer emulsion can be promoted, and the curing and water retention effects can be enhanced.

Compared with the comparative example 38, the embodiment 6 shows that the polymer emulsion is sprayed twice after the boric acid aqueous solution is sprayed, so that the influence of the boric acid aqueous solution on the film formation of the polymer emulsion can be reduced, and the water retention effect of the curing agent is improved. Comparative examples 39 to 40 change the amount of the boric acid aqueous solution sprayed, and as a result, the water retention of the concrete was decreased, indicating that the amount of the boric acid aqueous solution sprayed must be controlled within the range specified in the present invention to effectively enhance the adhesion between the permeable layer formed by the concrete curing agent and the organic film, thereby enhancing the water retention effect of the concrete curing agent.

The invention has the beneficial effects that: according to the concrete curing agent provided by the invention, the high-molecular emulsion can form a high-strength high-hardness waterproof organic film on the surface, the penetrant can effectively penetrate into the deep layer of concrete to promote the hydration process, and the concrete curing effect can be effectively improved by combining the penetrant and the concrete curing agent.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or some technical features thereof can be replaced. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete curing agent is characterized in that: the emulsion comprises 20-40 parts of polymer emulsion and 15-25 parts of penetrant by mass;

the preparation method of the polymer emulsion comprises the following steps:

s3, mixing the reaction product obtained in the step S2 with polyvinyl alcohol, adding the mixture into a high-speed dispersion machine, and uniformly dispersing to obtain a high-molecular emulsion;

the mass ratio of the paraffin to the polyethylene wax to the polyaryletherketone powder is 1: (0.1-0.3): (0.4-0.6), wherein the mass ratio of the ethylene to the vinyl acetate to the sodium propylene sulfonate is 1: (0.05-0.1): (0.03-0.08), the ratio of the total mass of the paraffin, the polyethylene wax and the polyaryletherketone powder to the total mass of the ethylene, the vinyl acetate and the sodium propylene sulfonate, the mass of the deionized water and the mass of the polyvinyl alcohol is 1: (0.4-0.6): (1.5-2): (0.1-0.2);

in step S2, the initiator is dimethyl azodiisobutyrate, the addition amount of the dimethyl azodiisobutyrate is 0.2-0.5% of the total mass of ethylene, vinyl acetate and sodium propylene sulfonate, and the addition amount of the sodium alkyl sulfonate is 0.8-1% of deionized water;

the raw materials for preparing the penetrant comprise 5-10 parts of sodium silicate, 20-30 parts of carboxymethyl cellulose gel particles, 0.1-0.3 part of retarder and 50-60 parts of deionized water, wherein the materials for preparing the carboxymethyl cellulose gel particles comprise 1-3 parts of lignin, 8-12 parts of barite powder, 50-60 parts of carboxymethyl cellulose sodium salt powder, 8-15 parts of aluminum sulfate powder and 5-10 parts of ferric sulfate powder;

2. The concrete curing agent of claim 1, wherein: in step S1, the temperature for mixing and melting the paraffin wax and the polyethylene wax is 120-130 ℃, the temperature for twin-screw extrusion is 330-340 ℃, the particle size of the ultrafine mixed granules is 0.1-0.6 μm, and in step S2, the temperature parameter of the reactor is 80-90 ℃, and the stirring parameter is 200-400 r/min.

3. The concrete curing agent of claim 1, wherein: in the step A, the heating and melting temperature of the lignin is 170-190 ℃, and the ejection quantity of the spray gun is 0.3-0.5 mL/s; in the step B, the mass concentration of the sodium carboxymethylcellulose solution is 2-3%, and the mass concentration of the aluminum sulfate and ferric sulfate mixed solution is 4-5%; c, dripping the sodium carboxymethyl cellulose solution for 30-40 min; the speed of the high-speed shearing machine in the step D is 700-.

4. A method of constructing a concrete curing agent according to any one of claims 1 to 3, characterized in that: the method comprises the following specific steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, and after the surface is semi-dried, spraying a high-molecular emulsion; wherein the dosage of the concrete curing agent is 0.18-0.22kg/m³。

5. A method of constructing a concrete curing agent according to any one of claims 1 to 3, characterized in that: the method comprises the following specific steps: after the surface of the concrete is dried, spraying a penetrating agent on the surface of the concrete, spraying a boric acid aqueous solution after the surface is half-dried, then immediately spraying 1/4-1/2 polymer emulsion, and after the surface is half-dried, spraying the rest 1/2-3/4 polymer emulsion;