CN113480232A - Preparation method of concrete defoaming agent for municipal engineering construction - Google Patents
Preparation method of concrete defoaming agent for municipal engineering construction Download PDFInfo
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- CN113480232A CN113480232A CN202110769315.2A CN202110769315A CN113480232A CN 113480232 A CN113480232 A CN 113480232A CN 202110769315 A CN202110769315 A CN 202110769315A CN 113480232 A CN113480232 A CN 113480232A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/50—Defoamers, air detrainers
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Abstract
The invention relates to the technical field of defoaming agents, and discloses a preparation method of a concrete defoaming agent for municipal engineering construction, which comprises the following steps: s1: preparing stock solution, namely performing vacuum distillation on 4-6 parts of 4% low-hydrogen siloxane and 0.5-1 part of 12% glycosyl-containing acrylate compound until the water content is below 0.1% to obtain the stock solution; s2: and (3) preparing a mixed solution, namely adding a solvent isopropanol and a polymerization inhibitor hydroquinone into the stock solution in the S1, and adding a catalyst when the temperature is raised to 50 ℃. The invention not only can enable the defoamer to have excellent emulsifying property through the acrylate compound containing glycosyl, but also can prevent the generation of foam through the protection of nitrogen, and can also enable the concrete defoamer to be free from demulsification, floating oil and strong in defoaming through mixing and heating.
Description
Technical Field
The invention relates to the technical field of defoaming agents, in particular to a preparation method of a concrete defoaming agent for municipal engineering construction.
Background
The antifoaming agent is a general term of substances which are added into foaming liquid at low concentration and can control foam, and is divided into foam inhibition and foam breaking from the action mechanism, in recent years, along with the development of high-performance concrete, people pay more attention to the strength and durability of concrete, and due to the addition of concrete admixture, too many large bubbles are introduced into fresh concrete, the gas content is higher, and the strength and durability of the hardened concrete are greatly influenced.
At this time, the defoaming agent is required to be added to eliminate bubbles and reduce the gas content of concrete, the commonly used defoaming agent at present can be roughly divided into three types of mineral oil type, organic silicon type and polyether type in composition, and the commonly used defoaming agent is widely applied in the fields of papermaking, coating, textile, food, pharmacy, petrochemical industry and the like, but the emulsification problem of the conventional concrete defoaming agent is complex, and if the emulsification is incomplete, the demulsification seriously influences the use effect in use and cannot meet the requirements of people.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a concrete defoamer for municipal engineering construction, which mainly solves the problems that the emulsification problem of the conventional concrete defoamer is complex, and if the emulsification is incomplete, the demulsification seriously affects the use effect in use.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a concrete defoaming agent for municipal engineering construction comprises the following steps:
s1: preparing stock solution, namely performing vacuum distillation on 4-6 parts of 4% low-hydrogen siloxane and 0.5-1 part of 12% glycosyl-containing acrylate compound until the water content is below 0.1% to obtain the stock solution;
s2: preparing a mixed solution, namely adding a solvent isopropanol and a polymerization inhibitor hydroquinone into the stock solution in the S1, adding a catalyst when the temperature is raised to 50 ℃, raising the temperature to 85-95 ℃, stirring, and dropwise adding an additive at a constant speed;
s3: distilling, dripping siloxane with low hydrogen content while stirring, carrying out addition reaction, and after the reaction is finished, carrying out vacuum distillation to remove low-boiling-point substances and a solvent to obtain a defoaming agent monomer;
s4, emulsifying, namely adding a defoaming agent monomer, an emulsifier Span 60 and an emulsifier Tween60 into a container in sequence, and stirring and dispersing to emulsify and mix the materials;
s5: adding the anticorrosive component, adding the thickening anticorrosive component, and continuously stirring for 2-3min to prepare the concrete defoamer emulsion;
s6: nitrogen protection, namely putting the prepared concrete defoamer into a nitrogen box for nitrogen protection, and uniformly stirring;
s7: and cooling, stopping stirring, and naturally cooling the solution to room temperature to obtain the concrete defoamer.
Based on the scheme, the glycosyl acrylate compound in S1 is glucosyloxyethyl acrylate or glucosyloxyethyl methacrylate.
As a further scheme of the invention, the additives in S2 are allyl alcohol polyoxyethylene polyoxypropylene ether and glycosyl acrylate compounds, the dropping speed is 3-10ml/min, the dropping time is 50-60min, and the reaction is continued for 2-3h after the dropping is finished.
Further, the catalyst in S2 is an isopropanol solution of chloroplatinic acid, an ethanol solution of chloroplatinic acid or a vinyl complex of chloroplatinic acid, and the platinum content in the catalyst is 10-100ppm of the total mass of the reactant system.
On the basis of the scheme, stirring for 4-5min at room temperature by using a high-shear disperser at a rotating speed of 8000-10000r/min in S4 to ensure that the emulsifier is completely and uniformly dispersed, adding hot water at 65-85 ℃ along the stirring direction for 8-10min, and continuously stirring for 2-5min after the addition is finished.
According to a further scheme of the invention, the anticorrosive component in S5 is composed of 2-methyl-4-isothiazolin-3-one and 2-methyl-5-chloro-4-isothiazolin-3-one, and the mass ratio of the 2-methyl-4-isothiazolin-3-one to the 2-methyl-5-chloro-4-isothiazolin-3-one is 4-22: 5.
Further, the temperature of the nitrogen box in the S6 is 68-76 ℃, and the stirring time is 1.5-2 h.
On the basis of the scheme, the cooling time in the S7 is 40-50min, and the cooling temperature is 26-38 ℃.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a concrete defoaming agent for municipal engineering construction, which has the following beneficial effects:
1. the water-soluble acrylate compound containing hydrophilic glycosyl is endowed with water solubility, the hydrophobic siloxane is endowed with hydrophobicity, the hydrophilic glycosyl and the hydrophobic siloxane are matched in a certain proportion, the water-soluble acrylate compound and the hydrophobic siloxane have excellent emulsifying property in water, have good compatibility with other additives for concrete, and simultaneously have strong acid and alkali resistance when being used as a nonionic surfactant.
2. The invention can keep the defoaming agent in good physical state by mixing and heating, does not break emulsion, does not float oil, has strong defoaming effect, has quick defoaming and lasting defoaming effect, and can be used for defoaming.
3. The invention can fully play the synergistic effect of each component through nitrogen protection, remarkably improve the defoaming capability, prevent the generation of foam, maintain excellent bubble stability, keep beneficial small bubbles and have certain foam inhibition performance.
4. The raw materials used in the invention are environment-friendly and efficient, are nontoxic and tasteless, do not cause any pollution to the environment, have low use cost and simple process, and have the advantages of low foam, good biodegradability and the like.
5. The invention can be used as a stabilizer through the preservative, has the advantage of reducing surface tension, has less foam and has certain defoaming capability.
Drawings
FIG. 1 is a schematic flow structure diagram of a preparation method of a concrete defoamer for municipal engineering construction, which is provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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
Referring to fig. 1, a preparation method of a concrete defoamer for municipal engineering construction comprises the following steps:
s1: preparing stock solution, namely performing vacuum distillation on 4 parts of 4% low-hydrogen siloxane and 0.5 part of 12% glycosyl-containing acrylate compound until the water content is 0.05% to obtain the stock solution;
s2: preparing a mixed solution, namely adding isopropanol serving as a solvent and hydroquinone serving as a polymerization inhibitor into the stock solution in S1, adding a catalyst when the temperature is raised to 50 ℃, then raising the temperature to 86 ℃, stirring, dropwise adding an additive at a constant speed, mixing and raising the temperature to ensure that a defoaming agent after reaction can keep a good physical state, does not break emulsion, does not float oil, has strong defoaming and foam-breaking and foam-inhibiting effects, is quick in defoaming and lasting in foam inhibition;
s3: distilling, dripping siloxane with low hydrogen content while stirring, carrying out addition reaction, and after the reaction is finished, carrying out vacuum distillation to remove low-boiling-point substances and a solvent to obtain a defoaming agent monomer;
s4, emulsifying, namely adding a defoaming agent monomer, an emulsifier Span 60 and an emulsifier Tween60 into a container in sequence, and stirring and dispersing to emulsify and mix the materials;
s5: adding an anticorrosive component, adding a thickening anticorrosive component, and continuously stirring for 2min to prepare a prepared concrete defoamer emulsion;
s6: the preparation concrete defoaming agent is placed into a nitrogen box for nitrogen protection and is uniformly stirred, the nitrogen protection can fully exert the synergistic effect of each component, the defoaming capability is obviously improved, the foam is prevented from being generated, the excellent bubble stability is maintained, beneficial small bubbles are kept, and the preparation concrete defoaming agent has certain foam inhibition performance;
s7: and cooling, stopping stirring, and naturally cooling the solution to room temperature to obtain the concrete defoamer.
The glycosyl acrylate compound in S1 is glucose oxyethyl acrylate or glucose oxyethyl methacrylate, the hydrophilic glycosyl acrylate compound is endowed with water solubility, the hydrophobic siloxane is endowed with hydrophobicity, the hydrophilic glycosyl acrylate compound and the hydrophobic siloxane are matched in a certain proportion, the water emulsifying property is good, the compatibility with other additives for concrete is good, meanwhile, the glycosyl surfactant is used as a nonionic surfactant, the acid and alkali resistance is strong, the additives in S2 are allyl alcohol polyoxyethylene polyoxypropylene ether and glycosyl acrylate compounds, the dropping speed is 4ml/min, the dropping time is 51min, the continuous reaction is completed after the dropping for 2.1h, the catalyst in S2 is an isopropanol solution of chloroplatinic acid, an ethanol solution of chloroplatinic acid or a vinyl complex of chloroplatinic acid, and the platinum content in the catalyst is 15ppm of the total mass of the reactant system.
It is to be noted that, stirring is carried out for 4.1min at a rotation speed of 8100r/min by a high shear disperser at room temperature in S4, after the emulsifier is completely dispersed uniformly, hot water with the temperature of 66 ℃ is added along the stirring direction, the adding time is 8.1min, stirring is continued for 2.2min after the adding is finished, the used raw materials are environment-friendly, efficient, nontoxic and tasteless, can not cause any pollution to the environment, the use cost is low, the process is simple, and the raw materials have the advantages of low foam, good biodegradability and the like, the antiseptic component in S5 consists of 2-methyl-4-isothiazoline-3-ketone and 2-methyl-5-chloro-4-isothiazoline-3-ketone, the mass ratio of the 2-methyl-4-isothiazoline-3-ketone to the 2-methyl-5-chloro-4-isothiazoline-3-ketone is 6:5, the preservative can also be used as a stabilizer, has the advantage of reducing surface tension, has less foam per se and certain defoaming capability, and has the advantages that the temperature of a nitrogen box in S6 is 69 ℃, the stirring time is 1.5h, the cooling time in S7 is 41min, and the cooling temperature is 27 ℃.
Example 2
Referring to fig. 1, a preparation method of a concrete defoamer for municipal engineering construction comprises the following steps:
s1: preparing stock solution, namely performing vacuum distillation on 5 parts of 4% low-hydrogen siloxane and 0.8 part of 12% glycosyl-containing acrylate compound until the water content is 0.08% to obtain the stock solution;
s2: preparing a mixed solution, namely adding isopropanol serving as a solvent and hydroquinone serving as a polymerization inhibitor into the stock solution in S1, adding a catalyst when the temperature is raised to 50 ℃, then raising the temperature to 90 ℃, stirring, dropwise adding an additive at a constant speed, mixing and raising the temperature to ensure that a defoaming agent after reaction can keep a good physical state, does not break emulsion, does not float oil, has strong defoaming and foam-breaking and foam-inhibiting effects, is quick in defoaming and lasting in foam inhibition;
s3: distilling, dripping siloxane with low hydrogen content while stirring, carrying out addition reaction, and after the reaction is finished, carrying out vacuum distillation to remove low-boiling-point substances and a solvent to obtain a defoaming agent monomer;
s4, emulsifying, namely adding a defoaming agent monomer, an emulsifier Span 60 and an emulsifier Tween60 into a container in sequence, and stirring and dispersing to emulsify and mix the materials;
s5: adding the anticorrosive component, adding the thickening anticorrosive component, and continuously stirring for 2.5min to prepare the concrete defoamer emulsion;
s6: the preparation concrete defoaming agent is placed into a nitrogen box for nitrogen protection and is uniformly stirred, the nitrogen protection can fully exert the synergistic effect of each component, the defoaming capability is obviously improved, the foam is prevented from being generated, the excellent bubble stability is maintained, beneficial small bubbles are kept, and the preparation concrete defoaming agent has certain foam inhibition performance;
s7: and cooling, stopping stirring, and naturally cooling the solution to room temperature to obtain the concrete defoamer.
The glycosyl acrylate compound in S1 is glucose oxyethyl acrylate or glucose oxyethyl methacrylate, the hydrophilic glycosyl acrylate compound is endowed with water solubility, the hydrophobic siloxane is endowed with hydrophobicity, the hydrophilic glycosyl acrylate compound and the hydrophobic siloxane are matched in a certain proportion, the water emulsifying property is good, the compatibility with other additives for concrete is good, meanwhile, the glycosyl surfactant is used as a nonionic surfactant, the acid and alkali resistance is strong, the additives in S2 are allyl alcohol polyoxyethylene polyoxypropylene ether and glycosyl acrylate compounds, the dropping speed is 6ml/min, the dropping time is 55min, the continuous reaction is completed after the dropping for 2.7h, the catalyst in S2 is an isopropanol solution of chloroplatinic acid, an ethanol solution of chloroplatinic acid or a vinyl complex of chloroplatinic acid, and the platinum content in the catalyst is 30ppm of the total mass of the reactant system.
It should be noted that, stirring for 4.5min at 9000r/min by a high shear disperser at room temperature in S4 to completely disperse the emulsifier uniformly, adding 75 ℃ hot water along the stirring direction for 9min, and continuously stirring for 3.5min after the addition is completed, the used raw materials are environment-friendly, efficient, nontoxic and tasteless, do not cause any pollution to the environment, have low use cost and simple process, and have the advantages of low foam, good biodegradability and the like, the antiseptic component in S5 comprises 2-methyl-4-isothiazoline-3-one and 2-methyl-5-chloro-4-isothiazoline-3-one, the mass ratio of the 2-methyl-4-isothiazoline-3-one to the 2-methyl-5-chloro-4-isothiazoline-3-one is 9:5, the preservative can also be used as a stabilizer, has the advantage of reducing surface tension, has less foam per se and certain defoaming capability, and has the temperature of 72 ℃ in a nitrogen box in S6, the stirring time of 1.8h, the cooling time of 47min in S7 and the cooling temperature of 32 ℃.
Example 3
Referring to fig. 1, a preparation method of a concrete defoamer for municipal engineering construction comprises the following steps:
s1: preparing stock solution, namely performing vacuum distillation on 6 parts of 4% low-hydrogen siloxane and 1 part of 12% glycosyl-containing acrylate compound until the water content is 0.09% to obtain the stock solution;
s2: preparing a mixed solution, namely adding isopropanol serving as a solvent and hydroquinone serving as a polymerization inhibitor into the stock solution in S1, adding a catalyst when the temperature is raised to 50 ℃, then raising the temperature to 94 ℃, stirring and dropwise adding an additive at a constant speed, mixing and raising the temperature to ensure that a defoaming agent after reaction can keep a good physical state, does not break emulsion, does not float oil, has strong defoaming and foam-breaking and inhibiting effects, is quick in defoaming and lasting in foam inhibition;
s3: distilling, dripping siloxane with low hydrogen content while stirring, carrying out addition reaction, and after the reaction is finished, carrying out vacuum distillation to remove low-boiling-point substances and a solvent to obtain a defoaming agent monomer;
s4, emulsifying, namely adding a defoaming agent monomer, an emulsifier Span 60 and an emulsifier Tween60 into a container in sequence, and stirring and dispersing to emulsify and mix the materials;
s5: adding an anticorrosive component, adding a thickening anticorrosive component, and continuously stirring for 3min to prepare a prepared concrete defoamer emulsion;
s6: the preparation concrete defoaming agent is placed into a nitrogen box for nitrogen protection and is uniformly stirred, the nitrogen protection can fully exert the synergistic effect of each component, the defoaming capability is obviously improved, the foam is prevented from being generated, the excellent bubble stability is maintained, beneficial small bubbles are kept, and the preparation concrete defoaming agent has certain foam inhibition performance;
s7: and cooling, stopping stirring, and naturally cooling the solution to room temperature to obtain the concrete defoamer.
The glycosyl acrylate compound in S1 is glucose oxyethyl acrylate or glucose oxyethyl methacrylate, the hydrophilic glycosyl acrylate compound is endowed with water solubility, the hydrophobic siloxane is endowed with hydrophobicity, the hydrophilic glycosyl acrylate compound and the hydrophobic siloxane are matched in a certain proportion, the water emulsifying property is good, the compatibility with other additives for concrete is good, the nonionic surfactant is used, the acid and alkali resistance is strong, the additives in S2 are allyl alcohol polyoxyethylene polyoxypropylene ether and glycosyl acrylate compounds, the dropping speed is 10ml/min, the dropping time is 60min, the reaction is continued for 3h after the dropping, the catalyst in S2 is an isopropanol solution of chloroplatinic acid, an ethanol solution of chloroplatinic acid or a vinyl complex of chloroplatinic acid, and the platinum content in the catalyst is 80ppm of the total mass of the reactant system.
It should be noted that, stirring is carried out for 5min at 9500r/min by a high shear disperser at room temperature in S4, after the emulsifier is completely dispersed uniformly, 84 ℃ hot water is added along the stirring direction for 9.5min, stirring is continued for 5min after the addition is finished, the used raw materials are environment-friendly, efficient, nontoxic and tasteless, do not cause any pollution to the environment, the use cost is low, the process is simple, and the raw materials have the advantages of low foam, good biodegradability and the like, the antiseptic component in S5 consists of 2-methyl-4-isothiazoline-3-ketone and 2-methyl-5-chloro-4-isothiazoline-3-ketone, the mass ratio of the 2-methyl-4-isothiazoline-3-ketone to the 2-methyl-5-chloro-4-isothiazoline-3-ketone is 17:5, the preservative can also be used as a stabilizer, has the advantage of reducing surface tension, has less foam per se and certain defoaming capability, and has the temperature of a nitrogen box in S6 of 75 ℃, the stirring time of 2h, the cooling time of 50min in S7 and the cooling temperature of 37 ℃.
In the description herein, it is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A preparation method of a concrete defoaming agent for municipal engineering construction is characterized by comprising the following steps:
s1: preparing stock solution, namely performing vacuum distillation on 4-6 parts of 4% low-hydrogen siloxane and 0.5-1 part of 12% glycosyl-containing acrylate compound until the water content is below 0.1% to obtain the stock solution;
s2: preparing a mixed solution, namely adding a solvent isopropanol and a polymerization inhibitor hydroquinone into the stock solution in the S1, adding a catalyst when the temperature is raised to 50 ℃, raising the temperature to 85-95 ℃, stirring, and dropwise adding an additive at a constant speed;
s3: distilling, dripping siloxane with low hydrogen content while stirring, carrying out addition reaction, and after the reaction is finished, carrying out vacuum distillation to remove low-boiling-point substances and a solvent to obtain a defoaming agent monomer;
s4, emulsifying, namely adding a defoaming agent monomer, an emulsifier Span 60 and an emulsifier Tween60 into a container in sequence, and stirring and dispersing to emulsify and mix the materials;
s5: adding the anticorrosive component, adding the thickening anticorrosive component, and continuously stirring for 2-3min to prepare the concrete defoamer emulsion;
s6: nitrogen protection, namely putting the prepared concrete defoamer into a nitrogen box for nitrogen protection, and uniformly stirring;
s7: and cooling, stopping stirring, and naturally cooling the solution to room temperature to obtain the concrete defoamer.
2. The method for preparing the concrete defoamer for municipal engineering construction according to claim 1, wherein the sugar-based acrylate compound in S1 is glucosoxyethyl acrylate or glucosoxyethyl methacrylate.
3. The method for preparing the concrete defoamer for municipal engineering construction according to claim 1, wherein the additives in S2 are allyl alcohol polyoxyethylene polyoxypropylene ether and glycosyl acrylate compounds, the dropping speed is 3-10ml/min, the dropping time is 50-60min, and the reaction is continued for 2-3h after the dropping.
4. The method for preparing the concrete defoamer for municipal engineering construction according to claim 3, wherein the catalyst in S2 is an isopropanol solution of chloroplatinic acid, an ethanol solution of chloroplatinic acid or a vinyl complex of chloroplatinic acid, and the platinum content in the catalyst is 10-100ppm of the total mass of the reactant system.
5. The method for preparing the concrete defoamer for municipal engineering construction according to claim 1, wherein the concrete defoamer is stirred at room temperature in S4 for 4-5min by a high shear disperser at a rotation speed of 8000-10000r/min, after the emulsifier is completely dispersed uniformly, hot water at 65-85 ℃ is added along the stirring direction for 8-10min, and after the addition is completed, the concrete defoamer is continuously stirred for 2-5 min.
6. The preparation method of the concrete defoamer for municipal engineering construction according to claim 5, wherein the preservative component in S5 consists of 2-methyl-4-isothiazolin-3-one and 2-methyl-5-chloro-4-isothiazolin-3-one, and the mass ratio of 2-methyl-4-isothiazolin-3-one to 2-methyl-5-chloro-4-isothiazolin-3-one is 4-22: 5.
7. The preparation method of the concrete defoamer for municipal engineering construction according to claim 1, wherein the temperature of the nitrogen tank in S6 is 68-76 ℃, and the stirring time is 1.5-2 h.
8. The method for preparing the concrete defoamer for municipal engineering construction according to claim 1, wherein the cooling time in S7 is 40-50min, and the cooling temperature is 26-38 ℃.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105293990A (en) * | 2015-12-14 | 2016-02-03 | 中建商品混凝土有限公司 | Self-emulsifying concrete defoamer and preparation method thereof |
| CN107955173A (en) * | 2017-11-22 | 2018-04-24 | 中建西部建设北方有限公司 | A kind of new concrete defoamer and its synthetic method |
| CN112707676A (en) * | 2020-10-23 | 2021-04-27 | 科之杰新材料集团有限公司 | Concrete defoaming agent and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105293990A (en) * | 2015-12-14 | 2016-02-03 | 中建商品混凝土有限公司 | Self-emulsifying concrete defoamer and preparation method thereof |
| CN107955173A (en) * | 2017-11-22 | 2018-04-24 | 中建西部建设北方有限公司 | A kind of new concrete defoamer and its synthetic method |
| CN112707676A (en) * | 2020-10-23 | 2021-04-27 | 科之杰新材料集团有限公司 | Concrete defoaming agent and preparation method thereof |
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| 白浩等: "高效乳液消泡剂的研制", 《应用化工》 * |
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