CN107603629A - A kind of environment-friendly type shield foaming agent and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of environment-friendly type shield foaming agent, it is made up of the raw material of following weight/mass percentage composition：Foaming agent 5~18%, foam stabilizer 4~10%, tackifier 2~8%, dispersant 2~6%, antistaling agent 0.2~2%, stabilizer 0.2~2%, foaming aidses 0.2~2%, surplus are water.The environment-friendly type shield foaming agent, its stability is high, and foam uniformity, good penetrability are environmentally safe.The invention also discloses the preparation method of above-mentioned environment-friendly type shield foaming agent, this method concise in technology, cost are low.

Description

A kind of environment-friendly shield foaming agent and preparation method thereof

technical field

The invention belongs to the field of building materials, and in particular relates to an environment-friendly shield foaming agent and a preparation method thereof.

Background technique

With the rapid development of society and economy and the continuous acceleration of urbanization, the development and utilization of urban underground space has become one of the important directions for the sustainable development of our society. The construction of underground transportation facilities has entered a stage of rapid development. In the shield construction technology of underground engineering that has attracted much attention, the earth pressure balance shield has been widely used due to its advantages of wide application range and low cost, and has become the mainstream of tunnel technology. When excavating in the mode of earth pressure balance, such as in the sand layer, gravel layer, especially in the excavation construction of the soil layer with large particle size, due to the high viscosity of the soil, high friction, high water permeability and poor fluidity of the cutting soil For other reasons, the soil entering the soil bin and the soil residue entering the screw conveying system are easy to be compacted and difficult to discharge.

In the subway construction site, the foam agent with a certain concentration, pressure and flow rate is used to fill the work area, and water, bentonite mud or foam agent are injected during the excavation process. After being fully stirred, the performance of the soil can be improved and ensured. Improve the fluidity of the soil and reduce the water permeability of the soil while maintaining the stability of the excavation surface. At the same time, adding foam can also reduce the friction between the cutter head and the soil body, reduce the torque, reduce the adhesion of clay on the casing and the cutter head, which is beneficial to the excavation of the soil discharge mechanism, and the required driving power can be reduced.

At present, the foaming agent used in my country's subway shield construction is mainly imported from abroad, and its price is relatively high, while the domestically produced shield foaming agent is usually based on the formula of foaming agent used in other fields such as lightweight foam concrete, and its stability Compared with imported products, there is still a certain distance, and the adaptability is limited.

Contents of the invention

The object of the present invention is to provide an environment-friendly shield foaming agent with high stability, good foam uniformity and permeability, and no pollution to the environment.

The object of the present invention is also to provide a preparation method of the above-mentioned environment-friendly shield foaming agent, which has simple process and relatively low cost.

The first object of the present invention is achieved through the following technical solutions: an environment-friendly shield foaming agent is made of the following raw materials in mass percentage:

Foaming agent 5～18%

Foam stabilizer 4～10%

Tackifier 2～8%

Dispersant 2～6%

Preservative 0.2～2%

Stabilizer 0.2～2%

Foaming aid 0.2～2%

The balance is water.

Further, in the environment-friendly shield foaming agent provided by the present invention, the mass percentage of each raw material is:

Foaming agent 8～15%

Foam stabilizer 5-8%

Tackifier 3~6%

Dispersant 3～6%

Preservative 0.2～1%

Stabilizer 0.2～1%

Foaming aid 0.2～1%

The balance is water.

Among the raw materials of the above-mentioned environment-friendly shield foaming agent:

The foaming agent described in the present invention is preferably sodium lauryl sulfate, fatty alcohol polyoxyethylene ether sodium sulfate, sodium α-alkenyl sulfonate, ammonium lauryl sulfate and sodium dodecylbenzenesulfonate one or several.

The foam stabilizer of the present invention is preferably one or more of sodium α-methyl sulfopalmitate, modified silicone resin polyether emulsion, coconut oil fatty acid diethanolamide and methyl cellulose.

The tackifier of the present invention is preferably one or more of alkyl glucoside, octylphenol polyoxyethylene ether and sodium naphthenate.

The dispersant of the present invention is preferably alkylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether.

The preservative of the present invention is preferably sodium benzoate, methylisothiazolinone or isothiazolone; the stabilizer is preferably sodium ethylenediamine tetramethylene phosphonate or disodium edetate; The foam aid is preferably fatty acid diethanolamide, fatty amine polyoxyethylene ether or gum arabic.

The water described in the present invention is preferably deionized water, and the temperature of the water is preferably 35-45°C.

The effect of each component among the present invention is as follows:

Foaming agent: has high surface activity, can effectively reduce the surface tension of the liquid, and arranges the double electron layer on the surface of the liquid film to surround the air. When the mechanical force is introduced into the air, bubbles are formed, and then composed of a single bubble Foam.

Foam stabilizer: It can improve the stability of shield foam agent and prolong the half-life of foam burst.

Viscosifier: Dissolved in water, through the same-sex electrostatic repulsion of ions, the molecular chain is extended from a helical shape to a rod shape, thereby increasing the viscosity of the water phase. In addition, the viscosity of the system is increased by bridging between latex particles and pigments to form a network structure.

Dispersant: A substance that can improve the surface tension between the various constituent phases in the foam to form a uniform and stable emulsion. Dispersants are surface-active substances with both hydrophilic and lipophilic groups in their molecules. They gather on the oil/water interface, which can reduce interfacial tension and reduce the energy required to form emulsions, thereby increasing the energy of emulsions.

Antistaling agent: can destroy the cell membrane of microorganisms, denature the protein in the cell, and inhibit the activity of the respiratory enzyme system of the cell.

Stabilizer: It can form a stable complex with calcium, magnesium ions and other scale-forming substances in water. It is easily soluble in water and plays a good role in chelation, dispersion and corrosion inhibition, preventing scaling and loosening the old scale layer. , easy to clean.

Foaming aid: it belongs to the surface active substance, which mainly reduces the interfacial tension on the air-water interface, promotes the formation of small air bubbles in the slurry, expands the sorting interface, and ensures that the bubbles rise to form a foam layer.

By using foaming agent, foam stabilizer, dispersant, tackifier, preservative, foam aid, and stabilizer together, an environmentally friendly shield foam agent can be made, which can effectively improve the quality of the foam agent and the foam stabilization performance Well, strong corrosion resistance.

The second object of the present invention is achieved through the following technical solutions: the preparation method of the above-mentioned environment-friendly shield foaming agent comprises the following steps: taking part of the water, adding a foaming agent, a foam stabilizer, and a dispersant under stirring conditions , stir until uniform, then add tackifier, preservative, stabilizer, foam aid and the remaining part of water, and continue to stir until light yellow transparent liquid, to obtain an environmentally friendly shield foam agent.

Wherein the consumption of part of the water is preferably 30-50% of the total mass of water. More preferably, it is 40%.

Further, the preparation method of the environment-friendly shield foaming agent provided by the present invention comprises the following steps: setting the temperature of the stainless steel stirring tank at 35-45°C, adding deionized water accounting for 40% of the total mass of deionized water into the stirring tank, Add foaming agent, foam stabilizer, and dispersant while stirring, and stir until uniform, then add tackifier, preservative, stabilizer, foam aid and remaining water, and continue stirring until light yellow transparent liquid, to obtain an environmentally friendly Shield foam.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The environment-friendly shield foaming agent of the present invention has a relatively high foaming rate, rich and delicate foam, good foam stability, and all indicators can meet the requirements of shield construction.

(2) The raw materials used in the environment-friendly shield foaming agent of the present invention have high degradability, are environmentally friendly, do not cause environmental pollution, and have low cost.

(3) The environment-friendly shield foaming agent of the present invention has stable quality, good corrosion resistance, is not affected by storage temperature and storage time, and has a long shelf life.

detailed description

In order to further understand the present invention, the following will be described in conjunction with specific examples, and the following examples are only used to illustrate the present invention rather than limit the present invention.

In the following examples, the raw materials used are commercially available raw materials unless otherwise specified.

Example 1

The environment-friendly shield foaming agent provided in this embodiment is made from the following raw materials in mass percentage:

Foaming agent 12%

Foam stabilizer 4%

Tackifier 3%

Dispersant 3%

Preservative 0.2%

Stabilizer 0.2%

Foaming aid 0.2%

The balance is 77.4% water.

Among the raw materials of this environment-friendly shield foaming agent:

The foaming agent is 6% sodium lauryl sulfate, 3% sodium fatty alcohol polyoxyethylene ether sulfate and 3% sodium α-alkenyl sulfonate.

The foam stabilizer is 2% of modified silicone resin polyether emulsion and 2% of methyl cellulose.

The tackifier is octylphenol polyoxyethylene ether.

The dispersant is selected from alkylphenol polyoxyethylene ether.

The preservative is selected from isothiazolinone.

The stabilizer is disodium edetate.

The foam aid is selected from fatty acid diethanolamide.

The water is deionized water, and the water temperature is 40°C.

The preparation process of this environment-friendly shield foaming agent is as follows: set the temperature of the stainless steel stirring tank at 40° C., add 35 to 45% (accounting for the total water mass) of deionized water in the stirring tank, add foaming agent while stirring, stabilize Foaming agent, dispersing agent, stir until uniform, then add tackifier, preservative, stabilizer, foam aid and remaining water, and continue stirring until light yellow transparent liquid, to obtain an environmentally friendly shield foaming agent.

Example 2

The environment-friendly shield foaming agent provided in this embodiment is made from the following raw materials in mass percentage:

Foaming agent 10%

Foam stabilizer 6%

Tackifier 4%

Dispersant 2%

Preservative 0.4%

Stabilizer 0.4%

Foaming aid 0.4%

The balance is 76.8% water.

Among the raw materials of this environment-friendly shield foaming agent:

The foaming agent is 5% sodium fatty alcohol polyoxyethylene ether sulfate, 3% sodium α-alkenyl sulfonate and 2% ammonium lauryl sulfate.

The foam stabilizer is 3% sodium α-methyl sulfopalmitate and 3% coconut oil fatty acid diethanolamide.

The thickener is selected from alkyl glycosides.

The dispersant is nonylphenol polyoxyethylene ether.

The preservative is methylisothiazolinone.

The stabilizer is sodium ethylenediamine tetramethylene phosphonate.

The foam aid is made of aliphatic amine polyoxyethylene ether.

The water is deionized water, and the water temperature is 35°C.

The preparation process of the environment-friendly shield foam agent is as follows: set the temperature of the stainless steel stirring tank at 35°C, add 35-45% deionized water into the stirring tank, add foaming agent, foam stabilizer and dispersant while stirring, Stir until uniform, then add tackifier, preservative, stabilizer, foam aid and remaining water, and continue to stir until light yellow transparent liquid, to obtain an environmentally friendly shield foam.

Example 3

The environment-friendly shield foaming agent provided in this embodiment is made from the following raw materials in mass percentage:

Foaming agent 14%

Foam stabilizer 7%

Tackifier 4%

Dispersant 3%

Preservative 0.3%

Stabilizer 0.3%

Foaming aid 0.3%

The balance is 71.1% water.

Among the raw materials of this environment-friendly shield foaming agent:

The foaming agent is 4% sodium fatty alcohol polyoxyethylene ether sulfate, 4% sodium α-alkenyl sulfonate and 6% sodium dodecylbenzenesulfonate.

The foam stabilizer is 4% modified silicone resin polyether emulsion and 3% methyl cellulose.

The tackifier is sodium naphthenate.

The dispersant is nonylphenol polyoxyethylene ether.

Antistaling agent selects sodium benzoate for use.

The stabilizer is disodium edetate.

The foam aid is selected from gum arabic.

The water is deionized water, and the water temperature is 40°C.

The preparation process of the environment-friendly shield foam agent is as follows: set the temperature of the stainless steel stirring tank at 40°C, add 35-45% deionized water into the stirring tank, add foaming agent, foam stabilizer and dispersant while stirring, Stir until uniform, then add tackifier, preservative, stabilizer, foam aid and remaining water, and continue to stir until light yellow transparent liquid, to obtain an environmentally friendly shield foam.

Example 4

The environment-friendly shield foaming agent provided in this embodiment is made from the following raw materials in mass percentage:

Foaming agent 5%

Foam stabilizer 10%

Tackifier 8%

Dispersant 6%

Preservative 2%

Stabilizer 2%

Foaming aid 2%

The balance is water.

Among the raw materials of the above-mentioned environment-friendly shield foaming agent:

The foaming agent is sodium dodecylbenzene sulfonate, the foam stabilizer is methyl cellulose, the viscosity enhancer is 2% of alkyl glycoside, 3% of octylphenol polyoxyethylene ether and 3% of sodium naphthenate, dispersed Agent is nonylphenol polyoxyethylene ether, and antistaling agent, stabilizer, foam aid are with embodiment 1.

The preparation method of this environment-friendly shield foaming agent is the same as in Example 1.

Example 5

The main performance index test of the foaming agent of embodiment 1-4

The prepared environment-friendly shield foaming agent is divided into 5 groups, and the first group to the fourth group correspond to Embodiments 1-4 of the present invention respectively, and the fifth group is a commercially available shield foaming agent sold by a certain company for comparative example, Foam each group of samples with a foaming machine, adjust the foaming speed of the foaming agent, and keep it constant.

Table 1 embodiment 1-4 and comparative document 1 main performance index of shield foaming agent

The test results in Table 1 show that: by comparing the two main technical indicators of the shield foaming agent, the 1h bleeding rate and the 1h settlement distance, the foam 1h bleeding rate ε of Examples 1-4 is the highest at 68.0%, and the lowest is 60.5%, all lower than 68.8% of comparative example; the 1h settlement distance of embodiment 1-4, the highest is 2mm, the minimum is 1mm, all lower than 5mm of comparative example; Show that the present invention has higher by above-mentioned result Foaming rate, rich and delicate foam, good foam stability, the foaming performance of the foaming agent of the present invention is better than that of the comparative sample.

Each component listed in the present invention, as well as the upper and lower limits and interval values of each component in the present invention can realize the present invention, and the examples are not listed one by one here. Some specific examples are listed above to illustrate the present invention, and it is necessary to point out that the above and below specific examples are only used to further illustrate the present invention, and do not represent limitations on the protection scope of the present invention. Some non-essential modifications and adjustments made by others according to the present invention still belong to the protection scope of the present invention.

Claims (10)

1. An environment-friendly shield foaming agent is characterized in that it is made from the following raw materials in mass percentage: Foaming agent 5～18% Foam stabilizer 4～10% Tackifier 2～8% Dispersant 2～6% Preservative 0.2～2% Stabilizer 0.2～2% Foaming aid 0.2～2% The balance is water. 2. environment-friendly type shield foaming agent according to claim 1, is characterized in that the mass percentage composition of each raw material is: Foaming agent 8～15% Foam stabilizer 5-8% Tackifier 3~6% Dispersant 3～6% Preservative 0.2～1% Stabilizer 0.2～1% Foaming aid 0.2～1% The balance is water. 3. The environment-friendly shield foaming agent according to claim 1 or 2, characterized in that: the foaming agent is sodium lauryl sulfate, fatty alcohol polyoxyethylene ether sodium sulfate, α-alkenyl sulfonic acid One or more of sodium, ammonium lauryl sulfate and sodium dodecylbenzenesulfonate. 4. The environment-friendly shield foaming agent according to claim 1 or 2, characterized in that: the foam stabilizer is sodium methyl α-sulfopalmitate, modified silicone resin polyether emulsion, coconut oil fatty acid One or more of diethanolamide and methylcellulose. 5. The environment-friendly shield foaming agent according to claim 1 or 2, characterized in that: said tackifier is one or more of alkyl glucoside, octylphenol polyoxyethylene ether and sodium naphthenate Several kinds. 6. The environment-friendly shield foam agent according to claim 1 or 2, characterized in that: the dispersant is alkylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether. 7. The environment-friendly shield foaming agent according to claim 1 or 2, characterized in that: said preservative is sodium benzoate, methylisothiazolinone or isothiazolone; said stabilizer is ethylene glycol Sodium amine tetramethylene phosphonate or disodium ethylenediamine tetraacetate; the foam aid is fatty acid diethanolamide, fatty amine polyoxyethylene ether or gum arabic. 8. The environment-friendly shield foaming agent according to claim 1 or 2, characterized in that: the water is deionized water, and the temperature of the water is 35-45°C. 9. The preparation method of the environment-friendly type shield foaming agent described in any one of claims 1-8, is characterized in that comprising the following steps: get part of water, add foaming agent, foam stabilizer, dispersant under stirring condition, Stir until uniform, then add tackifier, preservative, stabilizer, foam aid and the remaining part of water, and continue to stir until light yellow transparent liquid, to obtain an environmentally friendly shield foam. 10. The preparation method of the environment-friendly shield foaming agent according to claim 9, characterized in that: the amount of part of the water is 30-50% of the total mass of water.