Ionic-nonionic coupling embedded synergistic foaming agent and its preparation method and application

Abstract

The invention discloses an ionic-nonionic coupling inlay synergistic foaming agent and its preparation method and application, and belongs to the technical field of shield construction. The raw materials of the ionic-nonionic coupling inlay synergistic foaming agent of the invention are measured by mass, including: 5-10 parts of nonionic surfactant, 5 parts of anionic surfactant, 0.5-1 parts of coupling agent, 1 part of foam stabilizer and 83-88.5 parts of water. The foaming agent of the invention has a long half-life, a low residual concentration of toxic substances, can effectively meet the requirements of complex shield construction, solve the deficiencies in the prior art, and reduce the impact on the environment, and has good application value.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and in particular to an ion-nonionic coupling embedded synergistic foaming agent and a preparation method and application thereof. Background Art

[0002] The shield method is a fully mechanized dark excavation construction method that uses shield machinery to advance underground, and uses the shield shell and pipe segments to support the surrounding rock and soil to prevent collapse in the tunnel. At the same time, the soil is excavated using a cutting device, and the soil is transported out of the hole by an excavation machine, and the jack is used to pressurize the rear part and assemble prefabricated concrete pipe segments to form a tunnel structure.

[0003] The earth pressure balance shield method is currently the mainstream method in urban subway construction. In this method, foam improvers, as soil improvers, occupy a dominant position and have broad application prospects. During the construction of the earth pressure balance shield, special bubbles need to be injected into the excavation face or soil chamber to adjust the soil cut from the excavation face into a "plastic flow state" in the pressure chamber to avoid problems such as gushing, occlusion, caking, and instability of the construction excavation face, thereby ensuring the safety and stability of the shield construction process.

[0004] However, most of the related foaming agents in the existing technology still have problems such as low foaming rate, poor foam stability, non-green, non-environmental protection and poor resistance to hard water. These problems will make it difficult for the foaming agents to meet the requirements of shield construction in complex strata and still need further improvement. Summary of the invention

[0005] The purpose of the present invention is to provide an ionic-nonionic coupling embedded synergistic foaming agent and its preparation method and application to solve the above-mentioned problems in the background technology. The foaming agent of the present invention has a long half-life, a low residual concentration of toxic substances, can effectively meet the requirements of complex shield construction, solve the deficiencies in the prior art, and reduce the impact on the environment, and has good application value.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] One of the technical solutions of the present invention is to provide an ionic-nonionic coupling embedded synergistic foaming agent, wherein the raw materials, calculated by weight, include:

[0008] 5-10 parts of nonionic surfactant, 5 parts of anionic surfactant, 0.5-1 parts of coupling agent, 1 part of foam stabilizer and 83-88.5 parts of water.

[0009] Preferably, the nonionic surfactant is an alkyl glycoside.

[0010] The nonionic surfactant of the present invention is selected from alkyl polyglycosides, which has low surface tension, no cloud point, adjustable HLB value, strong wetting power, rich and delicate foam, strong compatibility, non-toxic, harmless, non-irritating to the skin, environmentally friendly, rapid and thorough biodegradation, can be rapidly and thoroughly decomposed by microorganisms, can be compounded with anionic surfactants, and has obvious synergistic effect. It has strong broad-spectrum antibacterial activity and significant product thickening effect.

[0011] Preferably, the anionic surfactant is sodium dodecylbenzene sulfonate.

[0012] The anionic surfactant of the present invention is selected from sodium dodecylbenzene sulfonate, has a biodegradability of more than 90%, has a low degree of environmental pollution, is not easily oxidized, has a strong foaming power and is relatively low in cost.

[0013] Preferably, the coupling agent is a titanate coupling agent.

[0014] Preferably, the foam stabilizer comprises silicone polyether emulsion and nano silicon dioxide.

[0015] The foam stabilizer of the present invention is selected from silicone polyether emulsion and nano silicon dioxide. Silicone polyether emulsion can significantly improve the stability of foam. It changes the internal arrangement order of molecules so that bubbles are arranged closely and neatly to form a dense inner film, thereby enhancing the compressive resistance of foam. The addition of nano silicon dioxide can improve the foaming performance of the foaming agent and make the foam richer and more stable. The synergistic effect of nano silicon dioxide and surfactant can further improve the stability of foam. The addition of nano silicon dioxide in the foaming agent can make the foam last for a long time without breaking after formation, which is very important for the stable supply and continuous effect of foam in shield construction.

[0016] More preferably, the mass ratio of the silicone resin polyether emulsion to the nano-silicon dioxide is 1:1.

[0017] The second technical solution of the present invention is to provide a method for preparing the above-mentioned ionic-nonionic coupling embedded synergistic foaming agent, comprising the following steps:

[0018] The raw materials are mixed in proportion to obtain the ionic-nonionic coupling embedded synergistic foaming agent.

[0019] Preferably, the preparation method of the ionic-nonionic coupled mosaic synergistic foaming agent is:

[0020] The coupling agent, nonionic surfactant and anionic surfactant are mixed, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water are added, and stirred with a glass rod for 3 minutes to obtain the ionic-nonionic coupling embedded synergistic foaming agent.

[0021] More preferably, when the titanate coupling agent is added, it is diluted with a diluent, the mass ratio of the titanate coupling agent to the diluent is 1:1, and the type of the diluent is isopropyl alcohol.

[0022] Preferably, the mixing temperature is 18-23°C.

[0023] The third technical solution of the present invention is to provide an application of the above-mentioned foaming agent in improving the soil in the soil bin of a shield machine.

[0024] The beneficial technical effects of the present invention are as follows:

[0025] The ionic-nonionic coupling embedded synergistic foaming agent designed by the present invention is very sensitive to changes in environmental pressure. After being discharged from the soil bin of the shield machine to the ground environment, it can disappear automatically in a short time as the pressure changes. It is also biodegradable and environmentally friendly. In addition, the foaming agent has a high bubble efficiency and a high foaming ratio, which can save material consumption, reduce costs, and have obvious economic benefits. The foaming agent can reduce the adhesion and blockage of ballast soil to the cutterhead, effectively prevent the formation of mud cakes, and help improve construction quality and ensure the efficiency and safety of shield construction.

[0026] This foaming agent can effectively solve the problems of gushing, occlusion, cake formation and instability of the construction excavation surface in the earth pressure balance shield, and can significantly improve the plasticity, fluidity and impermeability of the soil, and maintain the stability of the excavation surface. The improved soil is in a fluid plastic state, which is convenient for excavation, reduces the wear of the excavation system, and thus improves the construction efficiency. The mixture of ionic and non-ionic surfactants changes the microenvironment of the color development reaction, and produces a synergistic sensitization effect on the synergistic effect of the electron cloud distribution of the color development system.

[0027] The foaming agent of the present invention has a very long half-life, and the residual concentration of toxic substances is reduced by more than 90%. It can effectively meet the requirements of complex shield construction, solve the deficiencies in the prior art, and reduce the impact on the environment, and has good application value. DETAILED DESCRIPTION

[0028] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0029] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0030] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention pertains. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention.

[0031] The words “include,” “including,” “have,” “contain,” etc. used in the present invention are open-ended terms, meaning including but not limited to.

[0032] The "room temperature" in the present invention is 18-23°C unless otherwise specified.

[0033] All raw materials used in the following examples and comparative examples of the present invention are commercially available products.

[0034] Example 1

[0035] A foaming agent for a shield machine, comprising the following raw materials in parts by weight:

[0036] 5g of nonionic surfactant (alkyl polyglycoside APG0810), 5g of anionic surfactant (sodium dodecylbenzene sulfonate), 0.5g of coupling agent (titanium ester coupling agent), 1g of foam stabilizer (silicone resin polyether emulsion and nano-silicon dioxide in a mass ratio of 1:1) and 88.5g of water.

[0037] Preparation of foaming agent for shield machine:

[0038] At room temperature, the titanate coupling agent was diluted with 0.5 g of diluent (isopropanol), and then nonionic surfactant and anionic surfactant were poured in, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water were added, and stirred with a glass rod for 3 minutes to obtain a foaming agent for a shield machine.

[0039] Example 2

[0040] A foaming agent for a shield machine, comprising the following raw materials in parts by weight:

[0041] 5g of nonionic surfactant (alkyl polyglycoside APG0810), 5g of anionic surfactant (sodium dodecylbenzene sulfonate), 1g of coupling agent (titanium ester coupling agent), 1g of foam stabilizer (silicone resin polyether emulsion and nano-silica in a mass ratio of 1:1) and 88g of water.

[0042] Preparation of foaming agent for shield machine:

[0043] At room temperature, the titanate coupling agent was diluted with 1 g of diluent (isopropyl alcohol), and then nonionic surfactant and anionic surfactant were poured in, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water were added, and stirred with a glass rod for 3 minutes to obtain a foaming agent for a shield machine.

[0044] Example 3

[0045] A foaming agent for a shield machine, comprising the following raw materials in parts by weight:

[0046] 7g of nonionic surfactant (alkyl polyglycoside APG0810), 5g of anionic surfactant (sodium dodecylbenzene sulfonate), 0.5g of coupling agent (titanium ester coupling agent), 1g of foam stabilizer (silicone resin polyether emulsion and nano-silicon dioxide in a mass ratio of 1:1) and 86.5g of water.

[0047] Preparation of foaming agent for shield machine:

[0048] At room temperature, the titanate coupling agent was diluted with 0.5 g of diluent (isopropanol), and then nonionic surfactant and anionic surfactant were poured in, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water were added, and stirred with a glass rod for 3 minutes to obtain a foaming agent for a shield machine.

[0049] Example 4

[0050] A foaming agent for a shield machine, comprising the following raw materials in parts by weight:

[0051] 7g of nonionic surfactant (alkyl polyglycoside APG0810), 5g of anionic surfactant (sodium dodecylbenzene sulfonate), 1g of coupling agent (titanium ester coupling agent), 1g of foam stabilizer (silicone resin polyether emulsion and nano-silicon dioxide in a mass ratio of 1:1) and 86g of water.

[0052] Preparation of foaming agent for shield machine:

[0053] At room temperature, the titanate coupling agent was diluted with 1 g of diluent (isopropyl alcohol), and then nonionic surfactant and anionic surfactant were poured in, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water were added, and stirred with a glass rod for 3 minutes to obtain a foaming agent for a shield machine.

[0054] Example 5

[0055] A foaming agent for a shield machine, comprising the following raw materials in parts by weight:

[0056] 10g of nonionic surfactant (alkyl polyglycoside APG0810), 5g of anionic surfactant (sodium dodecylbenzene sulfonate), 0.5g of coupling agent (titanium ester coupling agent), 1g of foam stabilizer (silicone resin polyether emulsion and nano-silica in a mass ratio of 1:1) and 83.5g of water.

[0057] Preparation of foaming agent for shield machine:

[0058] At room temperature, the titanate coupling agent was diluted with 0.5 g of diluent (isopropanol), and then nonionic surfactant and anionic surfactant were poured in, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water were added, and stirred with a glass rod for 3 minutes to obtain a foaming agent for a shield machine.

[0059] Example 6

[0060] A foaming agent for a shield machine, comprising the following raw materials in parts by weight:

[0061] 10g of nonionic surfactant (alkyl polyglycoside APG0810), 5g of anionic surfactant (sodium dodecylbenzene sulfonate), 1g of coupling agent (titanium ester coupling agent), 1g of foam stabilizer (silicone resin polyether emulsion and nano-silica in a mass ratio of 1:1) and 83g of water.

[0062] Preparation of foaming agent for shield machine:

[0063] At room temperature, the titanate coupling agent was diluted with 1 g of diluent (isopropyl alcohol), and then nonionic surfactant and anionic surfactant were poured in, stirred with a glass rod for 5 minutes, and then a foam stabilizer and water were added, and stirred with a glass rod for 3 minutes to obtain a foaming agent for a shield machine.

[0064] Comparative Example 1

[0065] A commercially available SF-02 foaming agent is used as Comparative Example 1.

[0066] Effect verification

[0067] (1) Foaming rate test:

[0068] The foaming rate test of the foaming agent is one of the important indicators for evaluating the performance of the foaming agent, which reflects the volume of foam that can be generated by a unit volume of the foaming agent solution. The present invention adopts a high-speed stirring method to test the foaming rate, using the same conditions to stir the solution at high speed to generate foam, and recording the maximum volume of the generated foam when the stirring is just stopped, and calculating the foaming rate. The test results are shown in Table 1.

[0069] The calculation formula of the foaming ratio is: Foaming ratio (%) = (foam volume when stirring stops / original solution volume) × 100%

[0070] (2) Half-life test:

[0071] The half-life of the foaming agent reflects the stability of the foam, that is, the time required for the foam volume to decay to half of its original volume. The present invention uses a high-speed stirring method to measure the half-life. The solution is stirred at high speed under the same conditions to produce foam, and the foam volume is recorded when the stirring is just stopped; the time required for the foam volume to decay to half of the original volume is the foam half-life. The test results are shown in Table 1.

[0072] (3) Test of residual concentration of toxic substances:

[0073] Liquid phase gas spectroscopy was used to measure the residual concentration of toxic substances (surfactants). The test results are shown in Table 1.

[0074] (4) Degradation time test:

[0075] The half-life was measured by high-speed stirring method, where the solution was stirred at high speed under the same conditions to generate foam, and the time required for the foam to degrade was recorded. The test results are shown in Table 1.

[0076] (5) Adhesion test:

[0077] Add the foaming agent to the soil sample, observe the changes in the fluidity, adhesion and other indicators of the soil sample, and observe the adhesion of the ballast soil to the mixing arm. The test results are shown in Table 1.

[0078] Table 1

[0079]

[0080] It can be seen from Table 1 that the foaming ratio of the products of each embodiment of the present invention is improved compared with that of Comparative Example 1; the half-life increases with the increase in the amount of alkyl glycoside used, and generally speaking, the half-life is increased by more than 15% compared with Comparative Example 1; by comparing the residual toxic substances, it can be found that the residual toxic substances in the products of each embodiment are reduced by more than 90% compared with Comparative Example 1.

[0081] Low toxic residues mean less impact on the environment and lower biological toxicity to the ecosystem. Long half-life means the foam produced by this foaming agent can provide a longer-lasting maintenance effect, reducing the need for frequent use. Due to the low toxicity and long half-life characteristics, this foaming agent produces fewer pollutants during use, helping to reduce pollution to water and soil.

[0082] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An ionic-nonionic coupling embedded synergistic foaming agent, characterized in that: The raw materials are calculated by mass: 5-10 parts of nonionic surfactant, 5 parts of anionic surfactant, 0.5-1 parts of coupling agent, 1 part of foam stabilizer and 83-88.5 parts of water; The nonionic surfactant is alkyl polyglycoside APG0810; The anionic surfactant is sodium dodecylbenzene sulfonate; The foam stabilizer is a silicone resin polyether emulsion and nano silicon dioxide in a mass ratio of 1:

1.

2. The ionic-nonionic coupling mosaic synergistic foaming agent according to claim 1, characterized in that: The coupling agent is a titanate coupling agent.

3. A method for preparing the ionic-nonionic coupling embedded synergistic foaming agent according to claim 1 or 2, characterized in that: The following steps are involved: The raw materials are mixed in proportion to obtain the ionic-nonionic coupling embedded synergistic foaming agent.

4. The preparation method according to claim 3, characterized in that: The mixing temperature is 18-23°C.

5. Use of the foaming agent according to claim 1 or 2 in improving the soil in a soil bin of a shield machine.

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