CN114574217B - Ecological friendly shield foaming agent and preparation method and application thereof - Google Patents

Ecological friendly shield foaming agent and preparation method and application thereof Download PDF

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Publication number
CN114574217B
CN114574217B CN202111663320.1A CN202111663320A CN114574217B CN 114574217 B CN114574217 B CN 114574217B CN 202111663320 A CN202111663320 A CN 202111663320A CN 114574217 B CN114574217 B CN 114574217B
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China
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foaming agent
parts
foam
shield
surfactant
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CN114574217A (en
Inventor
王德乾
王明杰
李博
刘娇妹
谢宇飞
斯芳芳
孙世豪
焦文杰
刘焕卿
王粟丰
梁宏林
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Beijing China Railway New Material Technology Co ltd
China Railway Fifth Survey and Design Institute Group Co Ltd
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Beijing China Railway New Material Technology Co ltd
China Railway Fifth Survey and Design Institute Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • C09K17/42—Inorganic compounds mixed with organic active ingredients, e.g. accelerators
    • 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
    • E21D9/0685—Foaming agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2103/00—Civil engineering use
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to an ecological friendly shield foaming agent, a preparation method and application thereof, and the shield foaming agent comprises the following components in parts by weight: 4-12 parts of foaming agent, 2-5 parts of foam stabilizer and 0.15-0.3 part of thickener; wherein the foaming agent comprises 1-7 parts of zwitterionic surfactant, 2-3 parts of nonionic surfactant and 1-2 parts of anionic surfactant. The shield foaming agent provided by the disclosure not only has excellent foaming performance, but also has good foam stability; meanwhile, the used raw materials are degradable, are nontoxic and harmless, and cannot pollute the environment, so that the improved muck of the shield foaming agent provided by the disclosure cannot pollute the environment such as water, can ensure normal growth of plants, and can even improve muck without nutrients such as humus, so that the muck has the capability of growing plants.

Description

Ecological friendly shield foaming agent and preparation method and application thereof
Technical Field
The disclosure relates to the technical field of shield construction, in particular to an ecological friendly shield foaming agent and a preparation method and application thereof.
Background
In the construction of the earth pressure balance shield, the maintenance of stable excavation surface and the formation of good plastic flow soil in the earth cabin are important preconditions for the smooth construction of the shield. Sand layers and sandy gravel layers have strong water permeability and poor plastic fluidity and have mechanical instability, and in order to keep excavation smooth, the sand layers and the sandy gravel layers must be subjected to residue soil improvement. The foam improvement muck technology is a soil improvement technology of a soil pressure balance shield which is applicable from a gravel layer to a clay layer, has a great number of successful construction cases since the 80 s of the 20 th century, and is the most common method for solving the construction problem caused by the poor excavation of the soil at present. Therefore, the shield foaming agent is used as an important material for improving the slag soil of the shield machine, and has high requirements on foamability and foam stability during construction and high requirements on the flow plasticity of the improved slag soil.
At present, as for formulation components of the shield foaming agent, most of the components of the shield foaming agent come from undegradable petrochemical raw materials and derivatives thereof, and are extremely easy to cause pollution to the environment. As about 8 ten thousand tons of shield foaming agent are injected into the stratum every year, the slag containing the foaming agent can reach millions of tons, and because of the undegradable compounds included in the foaming agent, the foaming agent has a long-term or large or small adverse effect on environments such as water sources, and the like, and a huge burden is caused on the environment and the whole ecological system.
CN103951311a discloses an environment-friendly foaming agent and a preparation method thereof, wherein the foaming agent comprises the following components in parts by weight, such as carbide slag, animal hair, an excitation auxiliary agent, a regulator, an active agent and a stabilizer. CN103864334a discloses an environment-friendly foaming agent for earth pressure balance shield machine, which comprises the formula components of foaming agent, thickener, foam stabilizer, emulsifier, water quality stabilizer, preservative and the like; the patent application mainly achieves the aim of environmental protection by reducing the addition amount of heavy metals and organic pollutants in the product, but K12, LAS, sodium petronate, AES and the like used in the patent are all from petroleum and materials of derivatives thereof, and cannot be biodegraded. CN111349443a discloses a shield foam agent, which at least comprises a foaming agent, a thickening agent, a foam stabilizer and an air entraining agent; wherein the foaming agent comprises an anionic surfactant and a zwitterionic surfactant; the soil pressure balance shield foaming agent provided by the patent application has good foaming performance, but partial components used by the soil pressure balance shield foaming agent are biodegradable, but have a certain harm to the environment in practice.
Therefore, it is desired to provide a shield foaming agent which is excellent in foaming property, good in foam stability and environmentally friendly.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the disclosure provides an eco-friendly shield foaming agent and a preparation method and application thereof.
In a first aspect, the present disclosure provides an eco-friendly shield foam agent, the shield foam comprising, in parts by weight: 4-12 parts of foaming agent, 2-5 parts of foam stabilizer and 0.15-0.3 part of thickener;
wherein the foaming agent comprises 1-7 parts of zwitterionic surfactant, 2-3 parts of nonionic surfactant and 1-2 parts of anionic surfactant.
The shield foaming agent provided by the disclosure selects three surfactants as foaming agents simultaneously, and the zwitterionic surfactants, the nonionic surfactants and the anionic surfactants are matched with each other, so that on one hand, the foaming performance of the foaming agent is excellent while the use amount of the anionic surfactants and the nonionic surfactants is reduced, on the other hand, the use amount of the anionic surfactants and the nonionic surfactants is reduced, and meanwhile, the total use amount of the foaming agent is low, and the influence of excessive use of the anionic surfactants or the nonionic surfactants on ecology, especially the influence on plants, can be avoided.
The 1-7 parts of the zwitterionic surfactant disclosed in the present disclosure can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, etc.
The nonionic surfactant of the present disclosure may be 2.2 parts, 2.5 parts, 2.8 parts, etc.
The anionic surfactant 1-2 parts of the present disclosure may be 1.2 parts, 1.5 parts, 1.8 parts, etc.
The 2-5 parts of the foam stabilizer disclosed by the disclosure can be 3 parts, 4 parts and the like.
The thickener of the present disclosure may be 0.15-0.3 part, 0.18 part, 0.2 part, 0.22 part, 0.25 part, etc.
As a preferred embodiment of the present disclosure, the zwitterionic surfactant is selected from any one or a combination of at least two of coco propyl amide amine oxide, poly coco alcohol-maleic anhydride, poly coco alcohol-hydroxyethyl ethylenediamine, coco amidopropyl betaine, lauryl hydroxysulfobetaine, dodecyl betaine, lauramidopropyl amine oxide or lauryl amphoteric sodium acetate, preferably coco propyl amide amine oxide.
The poly coco alcohol-maleic anhydride is a copolymer of coco alcohol and maleic anhydride, and the poly coco alcohol-hydroxyethyl ethylenediamine is a copolymer of coco alcohol and hydroxyethyl ethylenediamine.
The preferred zwitterionic surfactant of the present disclosure is coco-propylamide ammonium oxide, which is obtained by modifying coco-oleyl alcohol with small molecules, is a pale yellow oily liquid, has excellent foamability, foam stability and biodegradability, and can meet the requirements of improvement of slag soil of a shield foaming agent.
The preferred zwitterionic surfactants of the present disclosure are non-toxic and harmless, and biodegradable, particularly preferred coco-propylamide amine oxides, whose main raw material coco alcohol is derived from coconut oil extracted from natural plants, are renewable resources.
As a preferred embodiment of the present disclosure, the nonionic surfactant is selected from any one or a combination of at least two of caprylyl glucoside, coco glucoside, lauryl glucoside, plant saponin, animal hoof-angle surfactant, animal hair surfactant, or animal blood gum surfactant, preferably caprylyl glucoside.
The animal hair surfactant disclosed by the disclosure refers to a surfactant obtained by modifying animal hair through hydrolysis extraction of fatty acid.
The preferred octenyl glucoside of the present disclosure is prepared by dehydration of octanol and decanol with glucose acetal, and the prepared main raw materials are natural, nontoxic, harmless, non-irritating and quick in biodegradation.
As a preferred embodiment of the present disclosure, the anionic surfactant is selected from any one or a combination of at least two of sodium cocoyl sulfate, sodium lauroyl glutamate, sodium cocoyl glutamate, potassium fatty acyl glycinate, sodium fatty acyl myoamino triethanolamine, sodium laureth sulfate, laureth phosphate and potassium laureth phosphate, and preferably sodium cocoyl glutamate. The sodium cocoyl glutamate is prepared by the acylation reaction of cocoyl chloride and glutamic acid, the prepared raw materials are natural and nontoxic and biodegradable, and the finally obtained sodium cocoyl glutamate is also nontoxic and degradable and does not pollute the environment.
As a preferred technical scheme of the present disclosure, the foam stabilizer is selected from any one or a combination of at least two of coconut acid monoacetic acid amide, coconut oil fatty acid diethanol amide or modified silicone polyether emulsion, preferably coconut oil fatty acid diethanol amide. The foam stabilizer disclosed by the disclosure is also mainly prepared from coconut oil extract, has excellent foam stabilizing performance, and is safe, nontoxic and degradable.
As a preferred embodiment of the present disclosure, the thickener is selected from any one or a combination of at least two of sodium chloride, potassium chloride, ammonium chloride, urea or potassium sulfate, preferably potassium chloride. The potassium chloride is preferably used as a thickening agent of the foaming agent, so that the thickening agent not only can play a role in thickening, but also can provide necessary nutrients for the growth of plants.
As a preferred technical scheme of the present disclosure, the shield foaming agent further comprises 76.4-89.75 parts of deionized water and 0.1-0.3 part of preservative in parts by weight.
The deionized water 76.4-89.75 parts of the present disclosure can be 78 parts, 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, etc.
The preservative of the present disclosure may be 0.1 to 0.3 parts, etc.
As a preferred technical scheme of the present disclosure, the total weight of the shield foaming agent is 100 parts by weight.
As a preferred embodiment of the present disclosure, the preservative includes any one or a combination of at least two of potassium sorbate, sodium lactate, or sodium dehydroacetate, preferably potassium sorbate. The potassium sorbate preferred by the present disclosure is the most widely used preservative in food additives, has excellent preservative properties and degradability, and is safe and nontoxic.
As a preferred technical scheme of the present disclosure, based on 100 parts of the total weight of the shield foaming agent, the shield foaming agent comprises the following components: 1-7 parts of amphoteric ion surfactant, 2-3 parts of nonionic surfactant, 1-2 parts of anionic surfactant, 2-5 parts of foam stabilizer, 0.15-0.3 part of thickener, 76.4-89.75 parts of deionized water and 0.1-0.3 part of preservative.
The shield foaming agent provided by the disclosure not only has excellent foaming performance, but also has good foam stability; meanwhile, the used raw materials are degradable, are nontoxic and harmless, and cannot pollute the environment, so that the improved muck of the shield foaming agent provided by the disclosure cannot pollute the environment such as water, can ensure normal growth of plants, and can even improve muck without nutrients such as humus, so that the muck has the capability of growing plants.
In a second aspect, the present disclosure provides a method for preparing the eco-friendly shield foam agent of the first aspect, the method comprising:
(1) Mixing the foaming agent with partial water, and adding the foam stabilizer for mixing;
(2) And (3) adding a formula amount of thickener, optional preservative and the rest of water into the mixed solution in the step (1) and mixing to obtain the ecological friendly shield foaming agent.
As a preferred embodiment of the present disclosure, the mixing temperature of the foaming agent and water is 40 ℃.
As a preferred embodiment of the present disclosure, the partial water is 40% water.
As a preferred embodiment of the present disclosure, the temperature of the mixing in step (2) is 50 ℃.
As a specific embodiment of the present disclosure, the preparation method of the present disclosure includes the steps of:
(1) Adding 40% of water into a stirring barrel, setting the stirring temperature to 40 ℃ for stirring, adding a zwitterionic surfactant, an anionic surfactant and a nonionic surfactant after the water in the stirring barrel reaches 40 ℃, stirring for 20min, and uniformly mixing to obtain a mixed solution 1.
(2) And adding a foam stabilizer into the mixed solution 1, and stirring for 10min to obtain a mixed solution 2.
(3) And (3) raising the stirring temperature to 50 ℃, continuously adding the thickening agent, the preservative and the rest water into the mixed solution 2, and stirring for 30min to obtain the ecological friendly shield foaming agent.
The preparation method provided by the disclosure has the advantages of simple process, no chemical reaction, no generation of industrial three wastes, no higher than 50 ℃ of production heating temperature, low energy consumption and no production danger.
In a third aspect, the present disclosure provides the use of the eco-friendly shield foam agent of the first aspect for improving dregs.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
(1) The foaming agent provided by the disclosure has excellent foamability and foam stability on the premise of low anion content by matching three different surfactants and matching components such as the foam stabilizer, so that the production cost can be reduced;
(2) Meanwhile, the addition of the lower anionic surfactant can avoid the adverse effect on plant growth caused by the fact that too much anionic surfactant exists in the dregs;
(3) The composition components of the shield foaming agent provided by the disclosure are basically degradable, so that the shield foaming agent is degradable, is nontoxic and harmless, and does not pollute the environment, therefore, the residue soil improved by using the shield foaming agent provided by the disclosure does not pollute the environment such as water, and can ensure the normal growth of plants, and is completely friendly to ecology;
(4) Meanwhile, the foam agent provided by the disclosure specifically prefers potassium chloride as a thickening agent, and even can improve the dregs without humus and other nutrients, so that the dregs have the capability of growing plants.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Example 1
The embodiment provides an ecological friendly shield foaming agent, which consists of the following components:
6kg of cocamidopropyl amine oxide, 2kg of caprylyl glucoside, 2kg of sodium cocoyl glutamate, 2kg of coconut fatty acid diethanolamide, 0.3kg of potassium chloride, 0.1kg of potassium sorbate and 87.6kg of water.
The preparation method comprises the following steps:
(1) Adding 40kg of water into a stirring barrel, setting the stirring temperature to 40 ℃ for stirring, adding 6kg of cocamidopropyl amine oxide, 2kg of sodium cocoyl glutamate and 2kg of caprylyl glucoside after the water in the stirring barrel reaches 40 ℃, and stirring for about 20min to obtain a uniform mixed solution 1;
(2) Adding 2kg of coconut oil fatty acid diethanolamide into the mixed solution 1, and stirring for about 10min to obtain a mixed solution 2;
(3) And (3) heating the stirring temperature to 50 ℃, continuously adding 0.3kg of potassium chloride, 0.1kg of potassium sorbate and 47.6kg of water into the mixed solution 2, and stirring for about 30min to obtain the ecological friendly shield foaming agent.
Examples 2 to 4
The embodiment provides an ecological friendly shield foaming agent.
The difference from example 1 is that the addition amount of cocamidopropyl amine oxide (zwitterionic surfactant) in this example was 4kg (example 2), 2kg (example 3), 1kg (example 4), and the same mass increased sodium cocoyl glutamate (anionic surfactant).
Example 5
The embodiment provides an ecological friendly shield foaming agent.
The difference from example 1 is that the cocamidopropyl amine oxide (zwitterionic surfactant) in this example is added in an amount of 9kg.
Examples 6 to 8
The embodiment provides an ecological friendly shield foaming agent.
The difference from example 1 is that the zwitterionic surfactant in this example is cocamidopropyl betaine (example 6), polycocobalyl-maleic anhydride (example 7), sodium lauryl amphoacetate (example 8).
Examples 9 to 11
The embodiment provides an ecological friendly shield foaming agent.
The difference from example 1 is that in this example, the amount of potassium chloride added was 0.2kg (example 9), 0.1kg (example 10), 1.0kg (example 11).
Example 12
The embodiment provides an ecological friendly shield foaming agent, which consists of the following components:
7kg of cocamidopropyl amine oxide, 3kg of caprylyl glucoside, 1kg of sodium cocoyl glutamate, 5kg of coconut fatty acid diethanolamide, 0.15kg of potassium chloride, 0.3kg of potassium sorbate and 83.55kg of water.
The preparation method is described in example 1.
Comparative examples 1 to 2
The comparative example provides an eco-friendly shield foaming agent.
The difference from example 1 is that cocamidopropyl amine oxide (zwitterionic surfactant) from example 1 is replaced by equal mass sodium cocoyl glutamate (comparative example 1, anionic surfactant), octyiglucoside (comparative example 2, nonionic surfactant).
Comparative examples 3 to 4
The comparative example provides an eco-friendly shield foaming agent.
The difference from example 1 is that in this comparative example, octyldecyl glucoside is replaced with equal mass of sodium cocoyl glutamate (comparative example 3, anionic surfactant), cocamidopropyl amine oxide (comparative example 4, zwitterionic surfactant).
Comparative example 5
The comparative example provides an eco-friendly shield foaming agent.
The difference from example 1 is that the foaming agent in this comparative example is sodium cocoyl glutamate, added in an amount of 10kg.
Comparative example 6
The comparative example provides an eco-friendly shield foaming agent.
The difference from example 1 is that the blowing agent in this comparative example is cocamidopropyl amine oxide added in an amount of 10kg.
Comparative example 7
The comparative example provides an eco-friendly shield foaming agent.
The difference from example 1 is that in this comparative example, potassium chloride is replaced with sodium chloride.
Performance testing
The foam formulations provided in examples 1-12 and comparative examples 1-7 were tested for performance by the following procedure:
(1) Foaming ratio testing method (refer to the enterprise standard of the group of the middle iron fifth investigation design institute, inc.)
Parameter set-point: the pressure of the foaming agent solution and the compressed air is 0.4MPa; the flow rate of the compressed air is 210L/min, the flow rate of the foaming agent solution is 14L/min, and the gas-liquid ratio is 15:1.
The bubble expansion ratio was measured by the following instrument, an electronic balance (precision: 0.01g, measuring range: 600 g), and a glass measuring cup (volume: 500 mL).
The test steps are as follows: placing a glass measuring cup with a certain volume on an electronic balance, and zeroing; foaming 3wt% of the shield foaming agent aqueous solution through the foaming device, filling the glass measuring cup with foam, and weighing to obtain foam mass m, wherein the mass of gas in the foam is ignored, namely the foam mass is approximately equal to the mass of the shield foaming agent aqueous solution after the foam is completely broken; the density rho of the shield foaming agent aqueous solution is about 1.0g/cm through densitometer test 3 The volume V of the shield foaming agent aqueous solution in the glass measuring cup can be obtained 1 Foam volume V f The volume of the glass measuring cup is calculated as the foaming multiplying power: er=v f /V l Wherein V is 1 ＝m/ρ。
And taking at least three times for each test, and taking an average value to obtain the foaming ratio measurement value of the shield foaming agent under the test condition.
(2) Half-life test method: half-life of a foam is a parameter that characterizes the stability of the foam, meaning the time corresponding to a mass of foam collapse of 50% of the total mass of the foam. According to the actual condition in shield construction, the stability of the foam for shield generally requires the half life of the foam to be more than 5min;
the experimental steps are as follows: placing the fading barrel on an electronic balance, and returning to zero; filling the foam just generated by the foaming device with a fading barrel, starting a stopwatch, and rapidly placing the stopwatch on an electronic balance to measure the mass of the foam; then rapidly placing the shield foaming agent on a tripod, wherein the bottom of the fading barrel is provided with a beaker and an electronic balance, and the half-life period is the time when the mass of the shield foaming agent aqueous solution dripped into the beaker is half of the mass of the foam in the fading barrel.
And taking at least three times for each test, and taking an average value to obtain the half-life measurement value of the shield foaming agent under the test condition.
(3) Plant viability test: culturing scindapsus aureus plants by using slag soil containing a foaming agent, and observing the survival condition of the plants after 3 months so as to test whether the environment is polluted or not;
the experimental steps are as follows: preparing a 3% ecological friendly foaming agent, preparing shield muck (anhydrous fine sand), mixing and stirring the foaming agent and the anhydrous fine sand until the mixture is uniform, preparing 30 scindapsus aureus with the height of 30+/-5 cm and good growth, normally culturing for 14 days, putting 30 scindapsus aureus into 10 flowerpots with the length and width of 10cm multiplied by 10cm on average, culturing for three months by adopting muck containing the foaming agent, taking plant withering as survival after three months, and recording the survival rate as a reference value of the foaming agent on the degree of environmental hazard.
The test results are shown in Table 1:
TABLE 1
According to the embodiment and the performance test, the shield foaming agent provided by the disclosure has excellent environmental protection, excellent foaming performance and excellent foam stability, and meanwhile, the thickening agent containing nitrogen, phosphorus and potassium fertilizers is innovatively adopted, so that the slag soil without humus and other nutrients after the improvement of the foaming agent has the capability of growing plants, the foaming multiplying power is more than 15, and the optimal foaming multiplying power is up to 17.0; the foam stability of the plant is better and can reach more than 7.0min, the optimal time is 8.3min, the plant survival rate is more than 80%, and the optimal time is 95%.
As is clear from comparison of examples 1 and examples 2 to 4, when the addition amount of the amphoteric surfactant in the foaming agent of the present disclosure is in the range of 1 to 7 parts, it is necessary to keep the addition amount of the anionic surfactant in the range of 1 to 2 parts, so that it is possible to achieve a double increase in the foaming ratio and foam stability while maintaining a certain balance, and it is harmless to plants, and if the addition amount of the anionic surfactant is too high, the plant irritation increases, resulting in a decrease in the survival rate thereof. From a comparison of example 1 and example 5, it is understood that if the amount of the zwitterionic surfactant added in the foaming agent exceeds the range defined in the present disclosure, the foaming stabilizing effect will be rather suppressed due to saturation of the surfactant content, while the plant is stimulated beyond the normal range, resulting in reduced viability. From a comparison of example 1 and examples 6-8, it can be seen that the zwitterionic surfactants of the present disclosure are selected from the group consisting of cocamidopropyl amine oxide, cocamidopropyl betaine, poly coco alcohol-maleic anhydride, sodium lauryl amphoacetate, and the like, and the preferred cocamidopropyl amine oxide has better foam stabilizing effect than other amphoteric surfactants. As is clear from comparison of examples 1 and examples 9 to 11, the foam provided by the present disclosure has an improved effect of improving the muck without humus with an increase in potassium chloride content in the range of 0.15 to 0.3 parts, and the plant survival rate is gradually increased, and when the foam is not in the range defined by the present disclosure, it is difficult to supply nutrition required for normal growth of plants if the concentration of potassium chloride is low, and the plant root system is desiccated and withered if the concentration of potassium chloride is high. As can be seen from comparison of example 1 and example 12, the foaming agent provided by the present disclosure has better foaming performance and foam stabilizing performance, and the plant survival condition is objective.
From example 1 and comparative examples 1-2, it is seen that the foaming and foam stabilizing effects are better when the present disclosure selects a zwitterionic surfactant as the predominant component. Meanwhile, as is apparent from comparison of example 1 and comparative examples 1 to 6, the present disclosure selects a zwitterionic surfactant, an anionic surfactant and a nonionic surfactant at the same time, is capable of stabilizing foam while the foaming agent has stable and excellent foaming properties, is harmless to plants, is capable of improving plant survival rate, and is poor in plant survival when the anionic surfactant or the nonionic surfactant exceeds the range defined in the present disclosure. As can be seen from example 1 and comparative example 7, the present invention selects potassium chloride as a thickener to make plant survival higher.
It should be noted that in this document, 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. Moreover, 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. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. 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 disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The ecological friendly shield foam agent is characterized in that the total weight of the shield foam is 100 parts by weight, and the shield foam agent comprises the following components in parts by weight: 4-12 parts of foaming agent, 2-5 parts of foam stabilizer, 0.15-0.3 part of thickener, 76.4-89.75 parts of deionized water and 0.1-0.3 part of preservative;
wherein the foaming agent comprises 1-7 parts of zwitterionic surfactant, 2-3 parts of nonionic surfactant and 1-2 parts of anionic surfactant;
the amphoteric surfactant is coco propyl amide amine oxide, the nonionic surfactant is caprylyl glucoside, the anionic surfactant is sodium cocoyl glutamate, and the thickener is potassium chloride.
2. The eco-friendly shield foam according to claim 1, wherein the foam stabilizer is selected from any one or a combination of at least two of coconut monoacetate amide, coconut fatty acid diethanolamide, or modified silicone polyether emulsion.
3. The eco-friendly shield foam formulation of claim 2, wherein the foam stabilizer is coconut oil fatty acid diethanolamide.
4. The eco-friendly shield foam according to claim 1, wherein the preservative comprises any one or a combination of at least two of potassium sorbate, sodium lactate or sodium dehydroacetate.
5. The eco-friendly shield foam formulation according to claim 4, wherein the preservative is potassium sorbate.
6. The method for preparing the eco-friendly shield foam agent according to any one of claims 1 to 5, wherein the method comprises:
(1) Mixing the foaming agent with partial water according to the formula amount, and then adding the foam stabilizer for mixing;
(2) And (3) adding a formula amount of thickener, preservative and the rest water into the mixed solution in the step (1) to mix, thereby obtaining the ecological friendly shield foaming agent.
7. Use of the eco-friendly shield foam agent of any one of claims 1 to 5 for improving slag.
CN202111663320.1A 2021-12-31 2021-12-31 Ecological friendly shield foaming agent and preparation method and application thereof Active CN114574217B (en)

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AU2005237158A1 (en) * 1999-08-12 2005-12-22 Construction Research & Technology Gmbh Tunnel Boring Method
CN103864334A (en) * 2014-02-12 2014-06-18 东莞市明洁隧道建设材料有限公司 Environment-friendly foaming agent for earth pressure balance shield tunneling machine
CN106635027A (en) * 2016-11-17 2017-05-10 纳拓润滑技术（上海）有限公司 Foaming agent for shielding and preparation method thereof
CN106753408A (en) * 2016-12-27 2017-05-31 福建中科建科技有限公司 A kind of novel shield foaming agent
CN106929023A (en) * 2017-02-17 2017-07-07 山东大学 The stable foam agent and preparation method and application of bad ground shield-tunneling construction
CN107033916A (en) * 2017-04-21 2017-08-11 中国建筑材料科学研究总院 A kind of Soil pressure balance shield foam agent and preparation method thereof

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AU2005237158A1 (en) * 1999-08-12 2005-12-22 Construction Research & Technology Gmbh Tunnel Boring Method
CN103864334A (en) * 2014-02-12 2014-06-18 东莞市明洁隧道建设材料有限公司 Environment-friendly foaming agent for earth pressure balance shield tunneling machine
CN106635027A (en) * 2016-11-17 2017-05-10 纳拓润滑技术（上海）有限公司 Foaming agent for shielding and preparation method thereof
CN106753408A (en) * 2016-12-27 2017-05-31 福建中科建科技有限公司 A kind of novel shield foaming agent
CN106929023A (en) * 2017-02-17 2017-07-07 山东大学 The stable foam agent and preparation method and application of bad ground shield-tunneling construction
CN107033916A (en) * 2017-04-21 2017-08-11 中国建筑材料科学研究总院 A kind of Soil pressure balance shield foam agent and preparation method thereof

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