阅读说明：本技术 一种混凝土防渗剂及其制备工艺 (Concrete anti-seepage agent and preparation process thereof ) 是由 陈礼平 于 2020-04-21 设计创作，主要内容包括：本发明涉及混凝土助剂技术领域,公开了一种混凝土防渗剂及其制备工艺,防渗剂的原料以重量份计包括聚氧化乙烯30-60份、异氰酸丙基三乙氧基硅烷10-40份、纳米二氧化硅40-80份、月桂醇聚醚硫酸酯钠12-25份以及水70-100份。能够延长防渗剂对混凝土的作用时间。制备工艺包括S1置基、S2吸附沉浸、S3调节pH以及S4交联,从而制得防渗剂。(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.)

1. A concrete anti-seepage agent is characterized in that: the raw materials comprise the following components in parts 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 and 70-100 parts of water.

2. A concrete penetration inhibitor according to claim 1, wherein: the raw materials also comprise 8-13 parts of magnesium aluminum silicate and 10-17 parts of polydimethylsiloxane PEG-8 beeswax ester by weight.

3. A concrete penetration inhibitor according to claim 2, wherein: the raw materials also comprise 20-35 parts of dimethylamino propionamido PCA polydimethylsiloxane.

4. A concrete penetration inhibitor according to claim 3, wherein: the raw materials also comprise, by weight, 20-40 parts of triethoxyoctylsilane, 2-5 parts of azodiisobutyronitrile and 1-2 parts of diethylenetriamine.

5. A concrete penetration inhibitor according to claim 4, wherein: the raw materials also 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.

6. A concrete penetration inhibitor according to claim 1, wherein: the average particle size of the nano-silica is 140-180 nm.

7. A process for preparing a concrete anti-seepage agent according to claim 5, which is characterized in that: the method 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.

8. The preparation process of the concrete anti-seepage agent according to claim 7, which is characterized in that: and S4 crosslinking, namely adding triethoxyoctylsilane, azodiisobutyronitrile and diethylenetriamine into the liquid treated by the S3 according to the parts by weight, heating the liquid to 70-80 ℃, and after standing is finished, cooling the liquid to room temperature in air to obtain the concrete anti-seepage agent.

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 is cracked, and the concrete is seeped. 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 silicon dioxide has excellent ageing resistance and chemical resistance, can improve the structural strength between the concrete coarse aggregate and the concrete 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 improving 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 sodium laureth sulfate, the surface tension of the system is reduced, and the system becomes an 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, triethoxyoctylsilane, isocyanic acid propyl triethoxy silane and dimethylamino propionamido PCA polydimethylsiloxane are subjected to cross-linking reaction, so that a three-dimensional net structure is generated on the surface of concrete, the three-dimensional net structure has the characteristic of hydrophobicity, the acting force between the isocyanic acid propyl triethoxy silane and the dimethylamino propionamido PCA polydimethylsiloxane and the concrete is stronger, the three-dimensional net structure can be prevented from falling off from the concrete, and meanwhile, 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; 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.