CN111517690B

CN111517690B - Concrete anti-seepage agent and preparation process thereof

Info

Publication number: CN111517690B
Application number: CN202010318761.7A
Authority: CN
Inventors: 陈礼平
Original assignee: Hangzhou Lipin Technology Co ltd
Current assignee: Hangzhou Lipin Technology Co ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2022-05-06
Anticipated expiration: 2040-04-21
Also published as: CN111517690A

Abstract

The invention relates to the technical field of concrete additives, and discloses a concrete anti-seepage agent and a preparation process thereof, wherein the raw materials of the anti-seepage agent comprise, by weight, 30-60 parts of polyoxyethylene, 10-40 parts of isocyanatopropyl triethoxysilane, 40-80 parts of nano silicon dioxide, 12-25 parts of sodium laureth sulfate and 70-100 parts of water. The action time of the anti-seepage agent on the concrete can be prolonged. The preparation process comprises S1 base setting, S2 adsorption immersion, S3 pH adjustment and S4 crosslinking, thereby preparing the anti-seepage agent.

Description

Concrete anti-seepage agent and preparation process thereof

Technical Field

The invention relates to the technical field of concrete additives, in particular to a concrete anti-seepage agent and a preparation process thereof.

Background

Concrete, referred to as "concrete" for short, refers to a general term for materials in engineering where aggregates are cemented into a whole by cementitious materials. The term concrete generally refers to cement as the gel material and sand and stone as the aggregate; the cement concrete, also called as common concrete, can be mixed with water (containing admixture and admixture) according to a certain proportion and then stirred, and is widely applied to civil engineering. The concrete is mainly divided into two stages and states; plastic state before setting and hardening, namely fresh concrete or concrete mixture. Hard state after hardening; i.e. hardened concrete or concrete.

In the use process of the concrete, the capillary pore channel can be formed in the evaporation process of the water in the concrete, and then the air hole can be left, so that the water seepage pore channel is formed in the concrete. Meanwhile, the construction vibration is not tight, and the problems of honeycomb holes and the like can also occur, so that the inner part cracks, and the concrete is caused to seep water. Thus, water enters the concrete structure under the action of static pressure or capillary, damages the concrete structure along with the passage of time, and the structure appearance is gradually old, loses luster, generates stains and causes fading.

In order to solve the problem of water seepage of concrete, an anti-permeability agent is usually added into the concrete. An anti-permeability agent is also called an anti-permeability agent. The water-soluble polymer can replace water to mix concrete or mortar, can be densely distributed in a high-molecular structure of the concrete or mortar layer in the reaction process of the water-soluble polymer and the concrete or mortar layer, and completely blocks capillary channels of the concrete or mortar, so that the cement and the mortar have hydrophobicity, the impermeability of the concrete is improved, and the compactness of the concrete is increased.

When the existing impermeable agent is mixed in concrete, the impermeable agent filled and blocked in a concrete gap can fall off after a long time, so that the action time of the impermeable agent on the concrete is short, and therefore the impermeable agent with long action time on the concrete is urgently needed to be provided.

Disclosure of Invention

One of the purposes of the invention is to provide a concrete anti-seepage agent, which can improve the acting force between the anti-seepage agent and coarse aggregate and fine aggregate, so that the acting force between the concrete anti-seepage agent and concrete raw materials can be improved, and finally the acting time of the concrete anti-seepage agent can be prolonged.

The technical purpose of the invention is realized by the following technical scheme:

30-60 parts of polyoxyethylene, 10-40 parts of isocyanatopropyl triethoxysilane, 40-80 parts of nano silicon dioxide, 12-25 parts of sodium laureth sulfate and 70-100 parts of water.

By adopting the technical scheme, the polyoxyethylene has good thermoplasticity and crystallinity, has good flexibility, is resistant to bacterial erosion, has low hygroscopicity in air and has good compatibility with other resins. The nano-silica has excellent aging resistance and chemical resistance, can improve the structural strength between concrete coarse aggregate and fine aggregate, has stable properties, and can resist acid rain and sunlight under the condition of long-term use, thereby improving the structural strength of the concrete and the compactness of the concrete.

The nano silicon dioxide and the polyoxyethylene are mixed to be used as the filler between the coarse aggregate and the fine aggregate, and the nano silicon dioxide and the polyoxyethylene are mixed by molecules, so that the nano silicon dioxide has the structural characteristics of stable structure, high strength and stable property.

The isocyanatopropyl triethoxysilane has isocyanate and ethoxy, can be used for coupling organic molecules and inorganic fillers, can enhance the action strength between the nano silicon dioxide and the polyoxyethylene and improve the action force between the nano silicon dioxide and the polyoxyethylene on the one hand, so that the structural strength of the fillers is higher. On the other hand, the acting force between the polyethylene oxide and the coarse aggregate and the fine aggregate can be improved, so that the acting force between the concrete anti-seepage agent and the concrete raw material can be improved, and finally the acting time of the concrete anti-seepage agent can be prolonged.

Because the particle size of the nano silicon dioxide is small, although the nano silicon dioxide has poor solubility in water, the solubility of the nano silicon dioxide in a system can be increased by adding the sodium laureth sulfate, the surface tension of the system is reduced, and the system becomes emulsion, so that the nano silicon dioxide can conveniently enter between coarse aggregate and fine aggregate in concrete, and the concrete anti-seepage agent can better play a role.

As a further improvement of the invention, the raw materials also comprise 8-13 parts of magnesium aluminum silicate and 10-17 parts of polydimethylsiloxane PEG-8 beeswax ester.

By adopting the technical scheme, the magnesium aluminum silicate has a large specific surface area and a developed micropore system. And the polydimethylsiloxane PEG-8 beeswax is a good emulsifier, and can promote the dispersibility of the aluminum magnesium silicate in water. Simultaneously, the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax are mutually combined to be used as an adsorbent, before the adsorbent is used, the anti-seepage agent is firstly contacted with a mixture of the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax, then the mixture of the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax and the anti-seepage agent are simultaneously coated on the concrete or are mixed in the concrete, and during the use process, polyethylene oxide, isocyanic acid propyl triethoxysilane, nano silicon dioxide and sodium lauryl alcohol polyether sulfate in the anti-seepage agent can be slowly released and play a role, so that the anti-seepage effect of the concrete on water can be prolonged.

As a further improvement of the invention, the raw materials also comprise 20 to 35 parts by weight of dimethylamino propionamido PCA polydimethylsiloxane.

By adopting the technical scheme, the dimethylamino propionamido PCA polydimethylsiloxane can act together with the polydimethylsiloxane PEG-8 beeswax ester to generate a gel product with calcium hydroxide in concrete, so that the porosity is reduced, the impermeability of the concrete is improved, the early strength of the concrete can be obviously improved, the acting force between the impermeable agent and the concrete can be improved, the acting time of the impermeable agent is further prolonged, and the impermeable agent is prevented from falling off.

As a further improvement of the invention, the raw materials also comprise 20-40 parts of triethoxyoctylsilane, 2-5 parts of azodiisobutyronitrile and 1-2 parts of diethylenetriamine by weight parts.

By adopting the technical scheme, triethoxyoctylsilane is added into the anti-seepage agent, and under the initiation of azodiisobutyronitrile and the promotion of diethylenetriamine, the triethoxyoctylsilane, the isocyanatopropyltriethoxysilane and the dimethylaminopropionylamino PCA polydimethylsiloxane are subjected to a cross-linking reaction, so that a three-dimensional net structure is generated on the surface of the concrete, the three-dimensional net structure has the characteristic of hydrophobicity, the acting force between the isocyanatopropyltriethoxysilane and the dimethylaminopropionylamino PCA polydimethylsiloxane and the concrete is stronger, the three-dimensional net structure can be prevented from falling off from the concrete, meanwhile, the three-dimensional net structure can better prevent water from permeating into the concrete, and the anti-seepage effect of the anti-seepage agent is improved; and meanwhile, the chloride ions can be prevented from permeating into the concrete, so that the steel bars in the concrete can be prevented from rusting.

As a further improvement of the invention, the raw materials further comprise 2-3 parts of buffer solution in parts by weight, and the buffer solution is a mixed solution of sodium acetate and acetic acid.

By adopting the technical scheme, the buffer solution is used, so that the anti-seepage agent is alkalescent, the cross-linking and curing effects of the diethylenetriamine on the triethoxyoctylsilane, the isocyanic acid propyltriethoxysilane and the dimethylamino propionamido PCA polydimethylsiloxane are better, and the structural strength of a three-dimensional network formed by the triethoxyoctylsilane, the isocyanic acid propyltriethoxysilane and the dimethylamino propionamido PCA polydimethylsiloxane is higher, and the acting time between the three-dimensional network and concrete is longer.

As a further improvement of the invention, the average particle size of the nano-silica is 140-180 nm.

The second purpose of the invention is to provide a preparation process of the concrete anti-seepage agent;

a preparation process of the concrete anti-seepage agent comprises the following steps:

s1: placing a base; firstly, mixing and stirring water, aluminum magnesium silicate and polydimethylsiloxane PEG-8 beeswax ester according to parts by weight for 20-30 min;

s2: adsorption and immersion; then adding nano silicon dioxide, sodium laureth sulfate, polyoxyethylene, isopropyltriethoxysilane isocyanate and dimethylamino propionamido PCA polydimethylsiloxane into the liquid treated by S1 according to the parts by weight, stirring for 5-8min, and standing for 10 min;

s3: adjusting the pH value; adding a buffer solution into the liquid treated by the S2, and adjusting the pH of the liquid system to 8-9;

s4: crosslinking; adding triethoxyoctylsilane, azobisisobutyronitrile and diethylenetriamine into the liquid treated by S3 according to the parts by weight, continuously stirring for 3-10min, and standing for 5-8 min;

and obtaining the concrete anti-seepage agent after S4.

By adopting the technical scheme, the water, the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax are uniformly mixed to prepare the slow-release matrix, and then the nano silicon dioxide, the sodium laureth sulfate, the polyoxyethylene, the isopropyltriethoxysilane isocyanate and the dimethylamino propionamido PCA polydimethylsiloxane can enter the slow-release matrix under the full soaking and stirring, so that the slow-release matrix can be acted for a longer time when being used in concrete subsequently. And then, the pH value is adjusted to be weakly acidic, and the diethylenetriamine is alkaline, so that the diethylenetriamine can play a good role in crosslinking and curing in a weakly alkaline environment, and a three-dimensional network structure can be finally obtained by the triethoxysilane, the isocyanatopropyltriethoxysilane and the dimethylaminopropionylamino PCA polydimethylsiloxane.

As a further improvement of the invention, the S4 crosslinking is that triethoxyoctylsilane, azobisisobutyronitrile and diethylenetriamine are added into the liquid treated by the S3 according to the parts by weight, the liquid is heated to 70-80 ℃ until the standing is finished, and the liquid is cooled to room temperature by air to obtain the concrete anti-seepage agent.

By adopting the technical scheme, the temperature is raised, so that the cross-linking reaction speed of the diethylenetriamine promoting triethoxyoctylsilane, the isocyanic acid propyl triethoxy silane and the dimethylamino propionamido PCA polydimethylsiloxane can be improved, the speed of preparing the anti-seepage agent is higher, and the time of workers is saved.

In conclusion, the invention has the advantages and beneficial effects that:

1. the action strength between the nano silicon dioxide and the polyoxyethylene can be enhanced, the action force between the nano silicon dioxide and the polyoxyethylene is improved, and the structural strength of the filler is higher; meanwhile, the acting force between the polyethylene oxide and the coarse aggregate and the fine aggregate can be improved, so that the acting force between the concrete anti-seepage agent and the concrete raw material can be improved, and the acting time of the concrete anti-seepage agent can be prolonged finally;

2. the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax are mutually combined to be used as an adsorbent, before use, the anti-seepage agent is coated on the mixture of the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax, then the mixture of the aluminum magnesium silicate and the polydimethylsiloxane PEG-8 beeswax and the anti-seepage agent are simultaneously coated on the concrete or are blended in the concrete, and during use, polyethylene oxide, isocyanic acid propyl triethoxysilane, nano silicon dioxide and sodium lauryl polyether sulfate in the anti-seepage agent can be slowly released and play a role, so that the anti-seepage effect of the concrete on water can be prolonged;

3. the dimethyl amino propionamido PCA polydimethylsiloxane can act together with the dimethyl polysiloxane PEG-8 beeswax to generate a gel product with calcium hydroxide in concrete, so that the porosity is reduced, the impermeability of the concrete is improved, the early strength of the concrete can be obviously improved, the acting force between an impermeable agent and the concrete can be improved, the acting time of the impermeable agent is further prolonged, and the impermeable agent is prevented from falling off;

4. by adding triethoxycaprylylsilane into the anti-seepage agent and under the initiation of azodiisobutyronitrile and the promotion of diethylenetriamine, the triethoxycaprylylsilane, the isocyanatopropyltriethoxysilane and the dimethylamino propionamido PCA polydimethylsiloxane are subjected to a cross-linking reaction, so that a three-dimensional net structure is generated on the surface of the concrete, the three-dimensional net structure can better prevent moisture from permeating into the concrete, and the anti-seepage effect of the anti-seepage agent is improved; meanwhile, chlorine ions can be prevented from permeating into the concrete, so that reinforcing steel bars in the concrete can be prevented from rusting;

5. firstly, uniformly mixing water, aluminum magnesium silicate and polydimethylsiloxane PEG-8 beeswax to prepare a slow-release matrix, and then enabling nano silicon dioxide, sodium laureth sulfate, polyoxyethylene, isopropyltriethoxysilane isocyanate and dimethylamino propionamido PCA polydimethylsiloxane to enter the slow-release matrix under the condition of sufficient soaking and stirring, so that the slow-release matrix can be acted for a longer time when the slow-release matrix is used in concrete subsequently; meanwhile, the pH value of the system is adjusted to be alkalescent, so that diethylenetriamine can play a good role in crosslinking and curing, and a three-dimensional network structure can be finally obtained by triethoxyoctylsilane, isocyanatopropyltriethoxysilane and dimethylamino propionamido PCA polydimethylsiloxane.

Drawings

FIG. 1 is a process flow diagram of a process for preparing a concrete anti-seepage agent according to example 1 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1:

a concrete anti-seepage agent comprises, by weight, 45 parts of polyethylene oxide, 25 parts of isopropyl triethoxysilane isocyanate, 60 parts of nano silica, 18 parts of sodium laureth sulfate, 85 parts of water, 10 parts of magnesium aluminum silicate, 13 parts of polydimethylsiloxane PEG-8 beeswax, 27 parts of dimethylamino propionamido PCA polydimethylsiloxane, 30 parts of triethoxyoctyl silane, 3 parts of azodiisobutyronitrile, 2 parts of diethylenetriamine and 2 parts of a buffer solution, wherein the buffer solution is a mixed solution of sodium acetate and acetic acid, and the pH value of a liquid system is adjusted to be equal to 8 by adjusting the respective amounts of the acetic acid and the sodium acetate. The average particle size of the nanosilica was 160 nm.

Referring to fig. 1, a process for preparing a concrete anti-seepage agent includes the following steps:

s1: and (4) setting a base. Firstly, water, magnesium aluminum silicate and polydimethylsiloxane PEG-8 beeswax are added into a stirring barrel according to the parts by weight in the embodiment, and the stirring is continued for 25 min.

S2: and (5) adsorbing and immersing. Then adding the nano-silica, sodium laureth sulfate, polyethylene oxide, isopropyltriethoxysilane isocyanate and dimethylamino propionamido PCA polydimethylsiloxane into the stirring barrel treated by S1 according to the weight parts in the embodiment, stirring for 6min, and standing for 10 min.

S3: the pH is adjusted. The buffer was added to the agitation tank after the treatment of S2, and the respective amounts of sodium acetate and acetic acid were controlled so that the pH in the agitation tank was adjusted to 8.

S4: and (4) crosslinking. And adding triethoxyoctylsilane, azodiisobutyronitrile and diethylenetriamine into the stirring barrel treated by S3 according to parts by weight, heating the liquid in the stirring barrel to 75 ℃, continuously stirring for 6min, standing for 6min, and then air-cooling to room temperature to obtain the concrete anti-seepage agent.

Examples 2 to 5 are different from example 1 in that the raw materials of the concrete anti-permeability agent are shown in table 1 in parts by weight: unit: portions are

TABLE 1

Examples 6-9 differ from example 1 in that the average particle size of the nanosilica is as shown in table 2: unit: nano meter

TABLE 2

Examples	Example 6	Example 7	Example 8	Example 9
					Particle size	140	180	150	170

Example 10 is different from example 1 in that the raw materials of the concrete anti-seepage agent include, in parts by weight, 45 parts of polyethylene oxide, 25 parts of isocyanatopropyltriethoxysilane, 60 parts of nano-silica, 18 parts of sodium laureth sulfate, and 85 parts of water.

A preparation process of a concrete anti-seepage agent comprises the following steps:

s1: and (4) setting a base. Water was added to the mixing vessel in the above-mentioned weight parts of this example and the mixing was continued for 25 min.

S2: and (5) adsorbing and immersing. Then, the nano-silica, sodium laureth sulfate, polyethylene oxide and isopropyltriethoxysilane were added to the stirring barrel treated in S1 in the above-mentioned weight parts, stirred for 6min and left to stand for 10 min. Obtaining the concrete anti-seepage agent. The average particle size of the nanosilica was 160 nm.

Example 11 is different from example 1 in that the raw materials of the concrete anti-seepage agent comprise, by weight, 45 parts of polyethylene oxide, 25 parts of isocyanatopropyl triethoxysilane, 60 parts of nano silicon dioxide, 18 parts of sodium laureth sulfate, 85 parts of water, 10 parts of magnesium aluminum silicate and 13 parts of polydimethylsiloxane PEG-8 beeswax ester. The average particle size of the nanosilica was 160 nm.

s1: and (4) setting a base. Water, magnesium aluminum silicate and polydimethylsiloxane PEG-8 beeswax were added into the stirring tank according to the above weight parts of this example and stirred for 25 min.

S2: and (5) adsorbing and immersing. Then, the nano-silica, sodium laureth sulfate, polyethylene oxide and isopropyltriethoxysilane were added to the stirring barrel treated in S1 in the above-mentioned weight parts, stirred for 6min and left to stand for 10 min. Obtaining the concrete anti-seepage agent. The average particle size of the nanosilica was 160 nm. Obtaining the concrete anti-seepage agent.

Example 12 is different from example 1 in that the raw materials of the concrete anti-seepage agent comprise, by weight, 45 parts of polyethylene oxide, 25 parts of isocyanatopropyl triethoxysilane, 60 parts of nano silica, 18 parts of sodium laureth sulfate, 85 parts of water, 10 parts of magnesium aluminum silicate, 13 parts of polydimethylsiloxane PEG-8 beeswax and 27 parts of dimethylaminopropionylamino PCA polydimethylsiloxane. The average particle size of the nanosilica was 160 nm.

Example 13 is different from example 1 in that raw materials of the concrete barrier agent in parts by weight include 45 parts of polyethylene oxide, 25 parts of isocyanatopropyltriethoxysilane, 60 parts of nano-silica, 18 parts of sodium laureth sulfate, 85 parts of water, 10 parts of magnesium aluminum silicate, 13 parts of polydimethylsiloxane PEG-8 beeswax, 27 parts of dimethylaminopropionylamido PCA polydimethylsiloxane, 30 parts of triethoxycaprylsilane, 3 parts of azobisisobutyronitrile, and 2 parts of diethylenetriamine, and the average particle size of the nano-silica is 160 nm.

Example 14 is different from example 1 in that a process for preparing a concrete permeation preventive comprises the following steps:

s1: and (4) setting a base. Firstly, water, magnesium aluminum silicate and polydimethylsiloxane PEG-8 beeswax are added into a stirring barrel according to the parts by weight in the embodiment, and the stirring is continued for 20 min.

S2: and (5) adsorbing and immersing. Then adding the nano-silica, sodium laureth sulfate, polyethylene oxide, isopropyltriethoxysilane isocyanate and dimethylamino propionamido PCA polydimethylsiloxane into the stirring barrel treated by S1 according to the weight parts in the embodiment, stirring for 5min, and standing for 10 min.

S3: the pH is adjusted. The buffer was added to the agitation tank after the treatment of S2, and the respective amounts of sodium acetate and acetic acid were controlled so that the pH in the agitation tank was adjusted to 9.

S4: and (4) crosslinking. And adding triethoxyoctylsilane, azodiisobutyronitrile and diethylenetriamine into the stirring barrel treated by S3 according to parts by weight, heating the liquid in the stirring barrel to 70 ℃, continuously stirring for 3min, standing for 5min, and then air-cooling to room temperature to obtain the concrete anti-seepage agent.

Example 15 differs from example 1 in that a process for preparing a concrete impermeability agent includes the following steps:

s1: and (4) setting a base. Firstly, water, magnesium aluminum silicate and polydimethylsiloxane PEG-8 beeswax are added into a stirring barrel according to the parts by weight in the embodiment, and the stirring is continued for 30 min.

S2: and (5) adsorbing and immersing. Then adding the nano-silica, sodium laureth sulfate, polyethylene oxide, isopropyltriethoxysilane isocyanate and dimethylamino propionamido PCA polydimethylsiloxane into the stirring barrel treated by S1 according to the weight parts in the embodiment, stirring for 8min, and standing for 10 min.

S4: and (4) crosslinking. Adding triethoxyoctylsilane, azodiisobutyronitrile and diethylenetriamine into the stirring barrel treated by S3 according to the parts by weight, heating the liquid in the stirring barrel to 80 ℃, continuously stirring for 10min, standing for 8min, and then air-cooling to room temperature to obtain the concrete anti-seepage agent.

Example 16 differs from example 1 in that S4: and (4) crosslinking. And adding triethoxyoctylsilane, azodiisobutyronitrile and diethylenetriamine into the stirring barrel treated by the S3 according to the parts by weight, continuously stirring for 6min, standing for 6min, and then air-cooling to room temperature to obtain the concrete anti-seepage agent.

Comparative example 1: is a concrete anti-permeability agent sold by Henan kang Wang Biotechnology Limited.

Comparative example 2: the difference from example 1 is that the raw materials are free of magnesium aluminum silicate and polydimethylsiloxane PEG-8 beeswax ester.

Comparative example 3: the difference from example 1 is that the starting materials are dimethyl amino propionamido PCA polydimethyl siloxane.

Comparative example 4: the difference from example 1 is that triethoxyoctylsilane, azobisisobutyronitrile and diethylenetriamine are not contained in the raw materials.

Comparative example 5: the concrete anti-seepage agent is characterized in that the preparation process of the concrete anti-seepage agent comprises the following steps of directly adding 45 parts by weight of polyethylene oxide, 25 parts by weight of isopropyl triethoxysilane, 60 parts by weight of nano silicon dioxide, 18 parts by weight of sodium laureth sulfate, 85 parts by weight of water, 10 parts by weight of magnesium aluminum silicate, 13 parts by weight of polydimethylsiloxane PEG-8 beeswax, 27 parts by weight of dimethylaminopropionyl PCA polydimethylsiloxane, 30 parts by weight of triethoxyoctylsilane, 3 parts by weight of azodiisobutyronitrile, 2 parts by weight of diethylenetriamine and 2 parts by weight of buffer solution, wherein the buffer solution is a mixed solution of sodium acetate and acetic acid, and the pH value of the liquid system is enabled to be equal to 8 by adjusting the respective amounts of the acetic acid and the sodium acetate, and completely adding the mixture into a stirring barrel to be stirred for 15min and 15 min.

Test one:

and (5) testing the concrete impermeability grade.

Referring to the standard test method myopia test in GB 501664 concrete quality control Standard, the measured impermeability grade of the test block is shown in Table 3:

and (2) test II: the test block after the test one measurement was left outdoors for 8 months, and then the test block was repeated again with the measurement data recorded to table 3.

TABLE 3

	Initial barrier rating	Grade of impermeability after 8 months
			Example 1	P12	P12
Example 10	P8	P4
			Example 11	P8	P6
Example 12	P8	P8
			Example 13	P10	P10
Example 16	P12	P12
			Comparative example 1	P4	-
Comparative example 2	P6	-
			Comparative example 3	P6	P4
Comparative example 4	P6	P4
			Comparative example 5	P6	P4

And (4) conclusion: according to the test data, the three-dimensional network structure generated by the cross-linking reaction of triethoxyoctylsilane, isocyanatopropyltriethoxysilane and dimethylaminopropionylamino PCA polydimethylsiloxane under the initiation of azodiisobutyronitrile and the promotion of diethylenetriamine can be obtained, the anti-seepage effect of the anti-seepage agent can be obviously improved, and the anti-seepage effect after 8 months is still the same as the initial anti-seepage effect. The higher the barrier rating, the stronger its barrier properties and the more durable its resistance. Wherein comparative example 1 and comparative example 2 have almost no permeation preventive effect after eight months, indicating that the produced permeation preventive has a short acting time.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The concrete anti-seepage agent is characterized by comprising the following raw materials, by weight, 30-60 parts of polyethylene oxide, 10-40 parts of isocyanatopropyl triethoxysilane, 40-80 parts of nano silicon dioxide, 12-25 parts of sodium laureth sulfate, 70-100 parts of water, 8-13 parts of magnesium aluminum silicate, 10-17 parts of polydimethylsiloxane PEG-8 beeswax ester, and 10-17 parts of dimethylamino propionamido PCA polydimethylsiloxane: 20-35 parts of triethoxyoctylsilane, 20-40 parts of azodiisobutyronitrile, 2-5 parts of diethylenetriamine and 2-3 parts of buffer solution; the buffer solution is a mixed solution of sodium acetate and acetic acid;

the preparation process of the concrete anti-seepage agent comprises the following steps:

s1, setting; firstly, mixing and stirring water, aluminum magnesium silicate and polydimethylsiloxane PEG-8 beeswax ester according to parts by weight for 20-30 min;

s2, adsorption immersion; then adding nano silicon dioxide, sodium laureth sulfate, polyoxyethylene, isopropyltriethoxysilane isocyanate and dimethylamino propionamido PCA polydimethylsiloxane into the liquid treated by S1 according to the parts by weight, stirring for 5-8min, and standing for 10 min;

s3, adjusting the pH value; adding a buffer solution into the liquid treated by the S2, and adjusting the pH of the liquid system to 8-9;

s4, crosslinking; adding triethoxyoctylsilane, azobisisobutyronitrile and diethylenetriamine into the liquid treated by S3 according to the parts by weight, continuously stirring for 3-10min, and standing for 5-8 min;

and obtaining the concrete anti-seepage agent after S4.

2. The concrete anti-seepage agent as recited in claim 1, wherein the nano silica has an average particle size of 140-180 nm.

3. The concrete anti-seepage agent according to claim 1, wherein the S4 is crosslinked, triethoxyoctylsilane, azobisisobutyronitrile and diethylenetriamine are added into the liquid treated by the S3 according to parts by weight, the liquid is heated to 70-80 ℃ until the standing is finished, and the liquid is cooled to room temperature by air to obtain the concrete anti-seepage agent.