CN113713440B - Defoaming agent for shield and preparation and application thereof - Google Patents
Defoaming agent for shield and preparation and application thereof Download PDFInfo
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- CN113713440B CN113713440B CN202110804581.4A CN202110804581A CN113713440B CN 113713440 B CN113713440 B CN 113713440B CN 202110804581 A CN202110804581 A CN 202110804581A CN 113713440 B CN113713440 B CN 113713440B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
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Abstract
The invention relates to a defoaming agent, and particularly discloses a defoaming agent for a shield, which comprises the following components in parts by mass: 0.5 to 1 portion of polyglycerol fatty acid ester defoaming agent, 0.5 to 2 portions of polyoxypropylene polyoxyethylene glycerol polyether ester, 0.05 to 0.2 portion of organic silicon defoaming agent, 0.1 to 1 portion of 2,5,8,11-tetramethyl-6-dodecene-5,8-diol, 0.05 to 0.5 portion of mineral oil defoaming agent, 0.1 to 1 portion of polyether modified silicone oil, 12 to 25 portions of industrial ethanol, 10 to 15 portions of 1,2-propylene glycol and 54.3 to 76.7 portions of water. The defoaming agent for the shield is specially used for quickly eliminating a large amount of waste foam on the ground of a shield construction site and a large amount of foam floating in a slurry shield liquid storage tank, and ensures the smooth operation of shield construction. The defoaming agent for the shield is simple to use, and can be uniformly sprayed on the surface of the floating foam by adopting a spray type spray gun. The components of the defoaming agent for the shield are nontoxic, biodegradable, green and environment-friendly, have no pollution to soil and underground water, have no corrosion to related metal parts of the shield tunneling machine, and have good application prospect.
Description
Technical Field
The invention relates to a defoaming agent, in particular to a defoaming agent for a shield.
Background
With the rapid development of urban rail transit in China, large and medium-sized cities in China start subway construction successively, the most common equipment for subway construction is a shield machine, a foaming agent is required for improving muck in the tunneling process of the shield machine, and muddy water in the construction of a muddy water shield also contains a foaming component. In order to ensure good slag soil improvement effect in the construction process, most of foams generated by the foaming agent for the shield used at present have the characteristics of high foaming rate and foam stability. However, as the country proposes the concept that the green water mountain is Jin Shanyin mountain and serves the purpose of a safe, convenient, efficient, green and economic strong traffic country, foam which is difficult to defoam in the shield construction process influences the normal construction process, influences the construction environment and causes pollution to a certain degree.
At present, the defoaming agents in domestic markets are mainly divided into oil-based defoaming agents and water-based defoaming agents, wherein the oil-based defoaming agents are most commonly used due to high defoaming speed. However, most of the defoaming agents in domestic markets are added into a foam system and then stirred to achieve the purpose of defoaming. And aiming at a large amount of waste foams on the ground of a shield construction site without stirring conditions and a large amount of foams floating in a slurry shield liquid storage tank, the existing defoaming agent cannot achieve a good defoaming effect.
Therefore, the development of a special defoaming agent which can quickly eliminate foam in a shield construction site or a slurry shield liquid storage tank without stirring is urgently needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the defoaming agent for the shield, and the preparation and the application thereof, so that foam in shield construction can disappear in a short time without stirring, the construction cost is saved, the construction progress is ensured, and the technical problem in the industry is solved.
In order to realize the purpose of the invention, the technical scheme of the invention is as follows:
in a first aspect, the invention provides a defoaming agent for a shield, which comprises the following components in parts by mass: 0.5 to 1 portion of polyglycerol fatty acid ester defoaming agent, 0.5 to 2 portions of polyoxypropylene polyoxyethylene glycerol polyether ester, 0.05 to 0.2 portion of organic silicon defoaming agent, 0.1 to 1 portion of 2,5,8,11-tetramethyl-6-dodecene-5,8-diol, 0.05 to 0.5 portion of mineral oil defoaming agent, 0.1 to 1 portion of polyether modified silicone oil, 12 to 25 portions of industrial ethanol, 10 to 15 portions of 1,2-propylene glycol and 54.3 to 76.7 portions of water.
Wherein the organosilicon defoamer is at least one of polydimethylsiloxane, ethylene glycol siloxane and dimethicone defoamer. The preferred polydimethylsiloxanes of the present invention are polydimethylsiloxanes.
The mineral oil defoaming agent is at least one of a mineral oil defoaming agent containing silicon dioxide, a mineral oil defoaming agent containing fatty acids and a mineral oil defoaming agent containing silicon oil. Preferred mineral oil defoamers of the present invention which contain silica.
In the above components, the silicone-based antifoaming agent includes, but is not limited to, polydimethylsiloxane, ethylene glycol siloxane, and dimethicone antifoaming agent.
The mineral oil type defoaming agent comprises but is not limited to a mineral oil type defoaming agent containing silicon dioxide, a mineral oil type defoaming agent containing fatty acids and a mineral oil type defoaming agent containing silicon oil.
In a second aspect, the invention provides a preparation method of the defoaming agent for the shield, which comprises the following steps:
(1) Dissolving polyoxypropylene polyoxyethylene glycerol polyether ester in industrial ethanol and 1,2-propylene glycol by a stirring device, and uniformly stirring to obtain a mixed solution 1;
(2) Adding a polyglycerol fatty acid ester defoaming agent, an organic silicon defoaming agent, 2,5,8,11-tetramethyl-6-dodecene-5,8-diol and a mineral oil defoaming agent into the mixed solution 1, and uniformly stirring to obtain a mixed solution 2;
(3) Cooling the mixed solution 2 to 30-35 ℃, and adding polyether modified silicone oil for stirring to obtain a mixed solution 3;
(4) And adding water into the mixed solution 3, and finally uniformly stirring to obtain the defoaming agent for the shield.
Preferably, in the step (1), the temperature during the stirring is controlled to 40 to 45 ℃.
In a third aspect, the invention provides an application of the defoaming agent for the shield in defoaming the shield. Specifically, the defoaming agent for the shield is uniformly sprayed on the surface of foam, for example, the defoaming agent for the shield is uniformly sprayed on the surface of ground froth and slurry shield liquid storage tank froth, so as to be specially used for quickly eliminating a large amount of waste foam appearing on the ground of a shield construction site and a large amount of foam floating in the slurry shield liquid storage tank.
The raw materials or reagents involved in the invention are all common commercial products, and the operations involved are all routine operations in the field unless otherwise specified.
The above-described preferred conditions may be combined with each other to obtain a specific embodiment, in accordance with common knowledge in the art.
The invention has the beneficial effects that:
the invention provides a defoaming agent for a shield, which is specially used for quickly eliminating a large amount of waste foam on the ground of a shield construction site and a large amount of foam floating in a slurry shield liquid storage tank, and ensures the smooth operation of the shield.
The defoaming agent for the shield is simple to use, and can be uniformly sprayed on the surface of the floating foam by adopting a spray type spray gun. The components of the defoaming agent for the shield are nontoxic, biodegradable, green and environment-friendly, have no pollution to soil and underground water, have no corrosion to related metal parts of the shield tunneling machine, and have good application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a process flow for preparing the defoamer for shield tunneling according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention may be more clearly understood, a solution of the present invention will be further described below. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein; it is to be understood that the embodiments described in this specification are only some embodiments of the invention, and not all embodiments.
Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
The embodiment provides an antifoaming agent for a shield, and the antifoaming agent formula for the shield consists of a polyglycerol fatty acid ester antifoaming agent, polyoxypropylene polyoxyethylene glycerol polyether ester, polydimethylsiloxane, 2,5,8,11-tetramethyl-6-dodecene-5,8-diol, a mineral oil antifoaming agent containing silicon dioxide, polyether modified silicone oil, industrial ethanol, 1,2-propanediol and water.
The defoaming agent for the shield comprises the following raw materials in parts by weight: 0.8kg of polyglycerin fatty acid ester defoaming agent, 0.5kg of polyoxypropylene polyoxyethylene glycerin polyether ester, 0.1kg of polydimethylsiloxane, 0.5, 8, 11-tetramethyl-6-dodecene-5,8-diol, 0.1kg of silica-containing mineral oil defoaming agent, 0.7kg of polyether modified silicone oil, 20kg of industrial ethanol, 10kg of 1, 2-propylene glycol and 67.5kg of water.
The preparation method comprises the following steps:
setting the stirring temperature of a stirring device to be 40-45 ℃, adding 0.5kg of polyoxypropylene polyoxyethylene glycerol polyether ester, 20kg of industrial ethanol and 10kg of 1, 2-propylene glycol into the stirring device, and uniformly stirring to obtain a mixed solution 1; adding 0.8kg of polyglyceryl fatty acid ester defoaming agent, 0.1kg of polydimethylsiloxane, 0.3kg of 2,5,8, 11-tetramethyl-6-dodecenyl-5,8-diol and 0.1kg of mineral oil defoaming agent containing silicon dioxide into the mixed solution 1, and stirring uniformly to obtain a mixed solution 2; cooling the mixed solution 2 to 30-35 ℃, adding 0.7kg of polyether modified silicone oil, and uniformly stirring to obtain a mixed solution 3; and adding 67.5kg of water into the mixed solution 3, and uniformly stirring to obtain the defoaming agent for the shield.
The physical and chemical indexes of the shield defoaming agent are shown in table 3.
TABLE 1 Defoamer Performance parameter Table for Shield constructs
| Index name | Detecting a value | Test methods (or standards) |
| Appearance of the product | Opalescent opaque liquid | Visual inspection of |
| Density (25 ℃ C.), g/cm3 | 0.943 | ASTM D1475 |
| pH value of acid or alkali | 8.25 | GB/T 11165-2005 |
Example 2
The embodiment provides an antifoaming agent for a shield, and the antifoaming agent formula for the shield consists of a polyglycerol fatty acid ester antifoaming agent, polyoxypropylene polyoxyethylene glycerol polyether ester, polydimethylsiloxane, 2,5,8,11-tetramethyl-6-dodecene-5,8-diol, a mineral oil antifoaming agent containing fatty acid, polyether modified silicone oil, industrial ethanol, 1,2-propanediol and water.
The defoaming agent for the shield comprises the following raw materials in parts by weight: 0.8kg of polyglycerin fatty acid ester defoaming agent, 0.5kg of polyoxypropylene polyoxyethylene glycerin polyether ester, 0.1kg of polydimethylsiloxane, 0.5, 8, 11-tetramethyl-6-dodecene-5,8-diol, 0.1kg of fatty acid-containing mineral oil defoaming agent, 0.7kg of polyether modified silicone oil, 20kg of industrial ethanol, 10kg of 1, 2-propylene glycol and 67.5kg of water.
The preparation method comprises the following steps:
setting the stirring temperature of a stirring device to be 40-45 ℃, adding 0.5kg of polyoxypropylene polyoxyethylene glycerol polyether ester, 20kg of industrial ethanol and 10kg of 1, 2-propylene glycol into the stirring device, and uniformly stirring to obtain a mixed solution 1; adding 0.8kg of polyglycerol fatty acid ester defoaming agent, 0.1kg of polydimethylsiloxane, 0.3kg of 2,5,8, 11-tetramethyl-6-dodecene-5,8-diol and 0.1kg of mineral oil defoaming agent containing fatty acid into the mixed solution 1, and stirring uniformly to obtain a mixed solution 2; cooling the mixed solution 2 to 30-35 ℃, adding 0.7kg of polyether modified silicone oil, and uniformly stirring to obtain a mixed solution 3; and adding 67.5kg of water into the mixed solution 3, and uniformly stirring to obtain the defoaming agent for the shield.
The physicochemical indexes of the shield defoaming agent are shown in table 2.
TABLE 2 Defoamer Performance parameter Table for Shield constructs
| Index name | Detecting a value | Test methods (or standards) |
| Appearance of the product | Opalescent opaque liquid | Visual inspection of |
| Density (25 ℃ C.), g/cm 3 | 0.961 | ASTM D1475 |
| pH value of acid or alkali | 8.42 | GB/T 11165-2005 |
Example 3
The embodiment provides an antifoaming agent for a shield, and the antifoaming agent formula for the shield consists of a polyglycerol fatty acid ester antifoaming agent, polyoxypropylene polyoxyethylene glycerol polyether ester, polydimethylsiloxane, 2,5,8,11-tetramethyl-6-dodecene-5,8-diol, a mineral oil antifoaming agent containing silicon oil, polyether modified silicone oil, industrial ethanol, 1,2-propanediol and water.
The defoaming agent for the shield comprises the following raw materials in parts by weight: 0.8kg of polyglycerin fatty acid ester defoaming agent, 0.5kg of polyoxypropylene polyoxyethylene glycerol polyether ester, 0.1kg of polydimethylsiloxane, 0.5, 8, 11-tetramethyl-6-dodecene-5,8-diol, 0.1kg of silicone oil-containing mineral oil defoaming agent, 0.7kg of polyether modified silicone oil, 2kg of industrial ethanol, 10kg of 1, 2-propylene glycol and 67.5kg of water.
The preparation method comprises the following steps:
setting the stirring temperature of a stirring device to be 40-45 ℃, adding 0.5kg of polyoxypropylene polyoxyethylene glycerol polyether ester, 20kg of industrial ethanol and 10kg of 1, 2-propylene glycol into the stirring device, and uniformly stirring to obtain a mixed solution 1; adding 0.8kg of polyglycerol fatty acid ester defoaming agent, 0.1kg of polydimethylsiloxane, 0.3kg of 2,5,8, 11-tetramethyl-6-dodecene-5,8-diol and 0.1kg of mineral oil defoaming agent containing silicon oil into the mixed solution 1, and stirring uniformly to obtain a mixed solution 2; cooling the mixed solution 2 to 30-35 ℃, adding 0.7kg of polyether modified silicone oil, and uniformly stirring to obtain a mixed solution 3; and adding 67.5kg of water into the mixed solution 3, and uniformly stirring to obtain the defoaming agent for the shield.
The physicochemical indexes of the defoaming agent for shield tunneling are shown in table 3.
TABLE 3 Defoamer Performance parameter Table for Shield constructs
| Index name | Detecting a value | Test methods (or standards) |
| Appearance of the product | Milky opaque liquid | Visual inspection of |
| Density (25 ℃), g/cm3 | 0.957 | ASTM D1475 |
| pH value of acid or alkali | 8.44 | GB/T 11165-2005 |
Examples of the experiments
The experimental example is used for verifying the defoaming effect of the defoaming agent for the shield, and is compared with the conventional defoaming agent.
1. Test object
Example 1 a defoaming agent for a shield, example 2 a defoaming agent for a shield, example 3 a defoaming agent for a shield, and a conventional defoaming agent RHODOLINE DF 691 for defoaming by stirring.
2. Experimental methods
According to the standard of iron five institute, a small spraying device is used for spraying 500mL of foam in a 500mL beaker at room temperature, and the defoaming time (unit: s) and the defoaming agent dosage (unit: g) after the foam sprayed into the beaker dissipates are recorded. Wherein RHODOLINE DF 691 is used in an amount of 1%, and the rest is used directly. The following results were obtained.
TABLE 4 Experimental results for antifoam
As is clear from the data in Table 4, in example 1, the defoaming effect was good because the defoaming time was short and the amount of the defoaming agent used was small.
The prior defoamer RHODOLINE DF 691 is added into a foam solution to inhibit the generation of foam or eliminate the generated foam, and the mode is difficult to eliminate a large amount of waste foam appearing on the ground of a shield construction site and a large amount of foam floating in a slurry shield liquid storage tank. And example 1 can reach fine defoaming effect under the condition of few quantity through spraying the defoaming agent to this type of foam, has very strong novelty and suitability to the abundant abandonment foam that appears on shield structure job site ground and the abundant foam that floats in the shield slurry reservoir.
Comparative example 1
The comparative example provides a preparation method of a defoaming agent grease for a shield, which has the basically same steps as the example 1, except that: 0.05kg of polydimethylsiloxane was added as a silicone defoamer.
Comparative example 2
The comparative example provides a preparation method of a defoaming agent grease for a shield, which has the basically same steps as the example 1, except that: 0.2kg of polydimethylsiloxane was added as a silicone defoamer.
Comparative example 3
The comparative example provides a preparation method of a defoaming agent grease for a shield, which has the basically same steps as the example 1, except that: 0.05kg of a mineral oil type defoaming agent containing silica was added as the mineral oil defoaming agent.
Comparative example 4
The comparative example provides a preparation method of a defoaming agent grease for a shield, which has the basically same steps as the example 1, except that: 0.2kg of a mineral oil type defoaming agent containing silica was added as a mineral oil defoaming agent.
The performance tests (by adopting the standard test of iron five institute enterprises) are carried out on the defoaming agents for the shield of the embodiment 1 and the comparative examples 1 to 4 by adopting the same method, and the test results are as follows:
TABLE 5 Performance testing of example 1 and comparative examples 1-4
As can be seen from table 5, as the content of the silicone defoaming agent or the mineral oil defoaming agent increases, the defoaming time decreases, the amount of the defoaming agent for shield tunneling decreases, but the defoaming performance does not increase further even when the content reaches a certain value, and therefore example 1 is the best example.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The preparation method of the defoaming agent for the shield is characterized by comprising the following components in parts by mass: 0.5 to 1 part of polyglycerol fatty acid ester defoaming agent, 0.5 to 2 parts of polyoxypropylene polyoxyethylene glycerol polyether ester, 0.05 to 0.2 part of silicone defoaming agent, 0.1 to 1 part of 2,5,8,11-tetramethyl-6-dodecene-5,8-diol, 0.05 to 0.5 part of mineral oil defoaming agent, 0.1 to 1 part of polyether modified silicone oil, 12 to 25 parts of industrial ethanol, 10 to 15 parts of 1,2-propylene glycol and 54.3 to 76.7 parts of water; and the preparation method comprises the following steps:
(1) At the temperature of 40-45 ℃, dissolving polyoxypropylene polyoxyethylene glycerol polyether ester into industrial ethanol and 1,2-propylene glycol by a stirring device, and uniformly stirring to obtain a mixed solution 1;
(2) Adding a polyglycerol fatty acid ester defoaming agent, an organic silicon defoaming agent, 2,5,8,11-tetramethyl-6-dodecene-5,8-diol and a mineral oil defoaming agent into the mixed solution 1, and uniformly stirring to obtain a mixed solution 2;
(3) Cooling the mixed solution 2 to 30-35 ℃, and adding polyether modified silicone oil for stirring to obtain a mixed solution 3;
(4) And adding water into the mixed solution 3, and finally uniformly stirring to obtain the defoaming agent for the shield.
2. The method according to claim 1, wherein the silicone defoaming agent is at least one of polydimethylsiloxane, ethylene glycol siloxane, and dimethylsilicone oil defoaming agent.
3. The method according to claim 1, wherein the mineral oil type antifoaming agent is at least one of a mineral oil type antifoaming agent containing silica, a mineral oil type antifoaming agent containing fatty acids, and a mineral oil type antifoaming agent containing silicone oil.
4. The use of the defoaming agent for the shield prepared by the preparation method according to any one of claims 1 to 3 in the defoaming of the shield.
5. The use according to claim 4, wherein the shield is sprayed uniformly onto the foam surface with an antifoaming agent.
6. The use of claim 5, wherein the defoaming agent for shield is specially used for rapidly eliminating a large amount of waste foam on the ground of the shield construction site and a large amount of foam floating in the slurry shield liquid storage tank by uniformly spraying the defoaming agent on the surface of the ground foam and the slurry shield liquid storage tank foam.
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| JP6181957B2 (en) * | 2013-03-27 | 2017-08-16 | 株式会社フジタ | Defoaming method for fluid excavated soil in bubble shield method |
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| CN105289048A (en) * | 2015-09-28 | 2016-02-03 | 泉州市福达科技咨询有限公司 | Organic silicon-modified polyether ester emulsion defoamer and preparation method thereof |
| CN106975247A (en) * | 2017-05-25 | 2017-07-25 | 济宁南天农科化工有限公司 | A kind of novel polyether ester defoamer and preparation method thereof |
| CN108744612B (en) * | 2018-05-25 | 2021-03-23 | 安徽銮威化工科技开发有限公司 | Mineral oil defoaming agent and preparation method thereof |
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| CN110156282A (en) * | 2019-05-13 | 2019-08-23 | 深圳申佳原环保科技有限公司 | A kind of shield slurry defoaming agent and preparation method thereof and application method |
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