CN117887472B - Environment-friendly dry powder foaming agent for shield construction and preparation method thereof - Google Patents
Environment-friendly dry powder foaming agent for shield construction and preparation method thereof Download PDFInfo
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- CN117887472B CN117887472B CN202410289013.9A CN202410289013A CN117887472B CN 117887472 B CN117887472 B CN 117887472B CN 202410289013 A CN202410289013 A CN 202410289013A CN 117887472 B CN117887472 B CN 117887472B
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- 239000004088 foaming agent Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- 238000010276 construction Methods 0.000 title claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 98
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 95
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 94
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 82
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 41
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 41
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 41
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 41
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 41
- 239000011734 sodium Substances 0.000 claims abstract description 41
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 41
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims abstract description 41
- 235000010234 sodium benzoate Nutrition 0.000 claims abstract description 41
- 239000004299 sodium benzoate Substances 0.000 claims abstract description 41
- 239000011780 sodium chloride Substances 0.000 claims abstract description 41
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 41
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- 235000010493 xanthan gum Nutrition 0.000 claims abstract description 41
- 238000003756 stirring Methods 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000008367 deionised water Substances 0.000 claims description 31
- 229910021641 deionized water Inorganic materials 0.000 claims description 31
- 239000000243 solution Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000007873 sieving Methods 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
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- 238000005260 corrosion Methods 0.000 abstract description 7
- 239000004035 construction material Substances 0.000 abstract description 2
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 14
- 239000002689 soil Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
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- IIEJGTQVBJHMDL-UHFFFAOYSA-N 2-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-5-[2-oxo-2-[3-(sulfamoylamino)pyrrolidin-1-yl]ethyl]-1,3,4-oxadiazole Chemical compound C1CN(CC1NS(=O)(=O)N)C(=O)CC2=NN=C(O2)C3=CN=C(N=C3)NC4CC5=CC=CC=C5C4 IIEJGTQVBJHMDL-UHFFFAOYSA-N 0.000 description 1
- JXDXANRCLTZYDP-UHFFFAOYSA-N 2-[3-(1,4-diazepan-1-ylmethyl)-4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]pyrazol-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound N1(CCNCCC1)CC1=NN(C=C1C=1C=NC(=NC=1)NC1CC2=CC=CC=C2C1)CC(=O)N1CC2=C(CC1)NN=N2 JXDXANRCLTZYDP-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention relates to the field of shield construction materials, in particular to an environment-friendly dry powder foaming agent for shield construction and a preparation method thereof, and specifically discloses an environment-friendly dry powder foaming agent for shield construction and a preparation method thereof, wherein the environment-friendly dry powder foaming agent comprises the following components in parts by weight: 5 to 10 parts of sodium dodecyl sulfate, 1 to 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.5 to 1 part of sodium chloride, 1.5 to 2 parts of xanthan gum, 1 to 2 parts of polyethylene glycol, 1 part of sodium benzoate and 0.5 to 2 parts of SDS functionalized graphene sheets; compared with the prior art, the anti-corrosion performance of the dry powder foaming agent is improved by using the SDS functionalized graphene oxide sheets, and further, the half life of the dry powder foaming agent is improved by using the SDS functionalized medium-size graphene oxide sheets.
Description
Technical Field
The invention relates to the field of shield construction materials, in particular to an environment-friendly dry powder foaming agent for shield construction and a preparation method thereof.
Background
In recent years, urban traffic is rapidly developed under the background of continuous and rapid development of economy in China, so that urban ground traffic resources are more and more tense. In order to solve the problem, urban traffic development gradually turns to underground space, and subway construction becomes one of the key points of urban development. In subway construction, the earth pressure balance shield construction method is widely applied, and has remarkable technical and economic advantages because the earth pressure balance shield construction method is not limited by factors such as topography, landform, soil layer and the like.
The earth pressure balance shield construction method requires that the muck have good fluidity, viscosity-soft consistency and low friction and water permeability. However, different formations (e.g., clay, sandy, water-rich) have different performance requirements for the slag modifier. For example, clay layers have a low permeability coefficient and relatively good water-stopping properties, but tend to adhere to cutterheads, resulting in excavation and soil removal difficulties. Therefore, it is necessary to use a slag modifier to prevent the occurrence of the sticking phenomenon. The sandy soil layer has larger internal friction angle and friction coefficient, so that the soil body has poorer mobility, the torque of the cutter head and the spiral soil discharger is increased, and the excavation and soil discharge are difficult. Therefore, the slag modifier needs to provide a certain water-stopping property.
In earth pressure balance shield construction, the properties of the soil body have an important influence on the excavation and soil discharge processes. Therefore, the ideal state of the soil body, namely the plastic flow state, is proposed, and is important for improving the construction effect. In order to improve soil properties, it is often necessary to use additives for soil improvement. Wherein, the dry powder foaming agent is a common modifier and has wide applicability and research value. The dry powder foaming agent can change the physical properties of soil, such as density reduction, fluidity improvement and adhesiveness reduction, so as to improve the engineering properties of soil and facilitate the construction of the earth pressure balance shield. However, the existing dry powder foaming agent has certain defects in foaming capacity, stability and corrosion resistance.
Disclosure of Invention
The invention aims to provide an environment-friendly dry powder foaming agent for shield construction and a preparation method thereof, which are used for solving the problem that the dry powder foaming agent in the prior art has certain defects in foaming capacity, stability and corrosion resistance.
The invention is realized by the following technical scheme:
The environment-friendly dry powder foaming agent for shield construction comprises the following components in parts by weight: 5 to 10 parts of sodium dodecyl sulfate, 1 to 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.5 to 1 part of sodium chloride, 1.5 to 2 parts of xanthan gum, 1 to 2 parts of polyethylene glycol, 1 part of sodium benzoate and 0.5 to 2 parts of SDS functionalized graphene sheets.
Further, the composition comprises the following components in parts by weight: 7-10 parts of sodium dodecyl sulfate, 1.5-2 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.8-1 part of sodium chloride, 1.5-2 parts of xanthan gum, 1.5-2 parts of polyethylene glycol, 1 part of sodium benzoate and 1-2 parts of SDS functionalized graphene sheets.
Further, the composition comprises the following components in parts by weight: 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 100 parts of water, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of SDS functionalized graphene sheets.
Further characterized in that the SDS-functionalized graphene is selected from SDS-functionalized medium-sized graphene oxide sheets;
the preparation method of the SDS functionalized medium-size graphene oxide sheet layer comprises the following steps: the medium-sized graphene oxide platelets were taken to disperse into an SDS ethanol solution, then sonicated, the precipitate was washed with ethanol to remove unreacted SDS, and then dried at 30 ℃.
Further, the preparation method of the medium-size graphene oxide sheet layer comprises the following steps: taking graphene oxide suspension, performing ultrasonic treatment, centrifuging, and then drying.
Further, the power of the ultrasonic wave is 500W, and the time of the ultrasonic wave is 5min.
Further, the preparation method of the graphene oxide suspension comprises the following steps: adding KNO 3 and graphene into 98% sulfuric acid, stirring, then slowly adding KMnO 4,, heating the obtained mixed solution to 35 ℃, and stirring for 6h; then adding deionized water dropwise and stirring vigorously, maintaining the temperature of the solution at 80 ℃ for 30min; and adding deionized water and H 2O2, centrifuging, washing and precipitating to be neutral, and diluting with deionized water to obtain graphene oxide suspension.
The invention also provides a preparation method of the shield construction environment-friendly dry powder foaming agent, which is characterized in that sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate are added into deionized water, after uniform stirring, the solution is heated, then sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional medium-size graphene oxide sheets are added, after uniform stirring, drying, crushing and sieving treatment are carried out, and a dry powder substance is obtained.
Further, the solution was heated to a temperature of 40 ℃.
Compared with the prior art, the invention has the following advantages and beneficial effects: the use of SDS functionalized graphene oxide sheets improves the corrosion resistance of the dry powder foam and further, the half life of the dry powder foam is improved by using SDS functionalized medium size graphene oxide sheets.
Detailed Description
The present invention will be described in further detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, and the description thereof is merely illustrative of the present invention and not intended to be limiting.
Preparation of graphene oxide in the invention:
adding KNO 3 1.2.2 g and graphene 1.0g into 46mL 98% sulfuric acid, stirring for 10min, slowly adding 6.0g KMnO 4,, heating the obtained mixed solution to 35 ℃, and stirring for 6h; then, 80mL of deionized water is added dropwise and stirred vigorously, and after 80mL of deionized water is added completely, the solution temperature is maintained at 80 ℃ for 30min; and adding 200mL of deionized water and 6mL of H 2O2, centrifuging, washing the precipitate to be neutral, and diluting with deionized water to 600mL to obtain graphene oxide suspension.
The preparation method comprises the following steps of:
40mL of the graphene oxide suspension prepared above was taken and stirred at 160 rpm h, then centrifuged, and then lyophilized.
The preparation of the medium-size graphene oxide sheet layer comprises the following steps:
taking 40mL of graphene oxide suspension prepared above, performing ultrasonic treatment at 500W power for 5min, centrifuging, and then drying.
The preparation of small-size graphene oxide sheets comprises the following steps:
40mL of the graphene oxide suspension prepared above was sonicated at 500W power for 1h, then centrifuged, and then dried.
The preparation of SDS functionalized graphene oxide sheets comprises the following steps:
Dispersing 2.5mg graphene oxide sheets into 50mL SDS ethanol solution, wherein the concentration of SDS in the SDS ethanol solution is 200mg/L, performing ultrasonic treatment for 30min, washing the precipitate with ethanol for 5 times to remove unreacted SDS, and then drying at 30 ℃; the SDS is sodium dodecyl sulfate, and the graphene oxide sheets are selected from one of large-size graphene oxide sheets, medium-size graphene oxide sheets and small-size graphene oxide sheets according to requirements; and when the graphene oxide sheets are selected from large-size graphene oxide sheets, obtaining SDS-functionalized large-size graphene oxide sheets, and similarly obtaining SDS-functionalized medium-size graphene oxide sheets and SDS-functionalized small-size graphene oxide sheets.
The preparation of CTAB functionalized graphene oxide sheets in the invention comprises the following steps:
Dispersing 2.5mg of graphene oxide sheets into 30mL of deionized water, carrying out ultrasonic treatment for 30min, then adding 10mg of CTAB, heating the mixed solution to 60 ℃ in a reflux way, refluxing at 60 ℃ for 1h, centrifuging the obtained mixed solution, washing the obtained precipitate with deionized water for 5 times, and drying the washed precipitate in a vacuum drying oven at a drying temperature of 80 ℃; wherein CTAB is cetyl trimethyl ammonium bromide, and the graphene oxide sheets are selected from one of large-size graphene oxide sheets, medium-size graphene oxide sheets and small-size graphene oxide sheets according to requirements; and when the graphene oxide sheets are selected from large-size graphene oxide sheets, obtaining CTAB functionalized large-size graphene oxide sheets, and similarly obtaining CTAB functionalized medium-size graphene oxide sheets and CTAB functionalized small-size graphene oxide sheets.
Example 1
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 5 parts of sodium dodecyl sulfate, 1 part of sodium dodecyl polyoxyethylene ether sulfate, 0.5 part of sodium chloride, 1.5 parts of xanthan gum, 1 part of polyethylene glycol, 1 part of sodium benzoate and 0.5 part of SDS functionalized large-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional large-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 2
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 7 parts of sodium dodecyl sulfate, 1.5 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.8 part of sodium chloride, 1.8 parts of xanthan gum, 1.5 parts of polyethylene glycol, 1 part of sodium benzoate and 1 part of SDS functionalized large-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional large-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 3
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 8 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 1.5 parts of SDS functionalized large-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional large-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 4
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of SDS functionalized large-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional large-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 5
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 5 parts of sodium dodecyl sulfate, 1 part of sodium dodecyl polyoxyethylene ether sulfate, 0.5 part of sodium chloride, 1.5 parts of xanthan gum, 1 part of polyethylene glycol, 1 part of sodium benzoate and 0.5 part of SDS functionalized medium-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functionalized medium-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 6
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 7 parts of sodium dodecyl sulfate, 1.5 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.8 part of sodium chloride, 1.8 parts of xanthan gum, 1.5 parts of polyethylene glycol, 1 part of sodium benzoate and 1 part of SDS functionalized medium-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functionalized medium-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 7
The environment-friendly dry powder foaming agent for shield construction comprises 8 parts by weight of sodium dodecyl sulfate, 2 parts by weight of sodium dodecyl polyoxyethylene ether sulfate, 1 part by weight of sodium chloride, 2 parts by weight of xanthan gum, 2 parts by weight of polyethylene glycol, 1 part by weight of sodium benzoate and 1.5 parts by weight of SDS functionalized medium-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functionalized medium-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 8
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of SDS functionalized medium-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functionalized medium-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 9
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 5 parts of sodium dodecyl sulfate, 1 part of sodium dodecyl polyoxyethylene ether sulfate, 0.5 part of sodium chloride, 1.5 parts of xanthan gum, 1 part of polyethylene glycol, 1 part of sodium benzoate and 0.5 part of SDS functionalized small-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional small-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 10
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 7 parts of sodium dodecyl sulfate, 1.5 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.8 part of sodium chloride, 1.8 parts of xanthan gum, 1.5 parts of polyethylene glycol, 1 part of sodium benzoate and 1 part of SDS functionalized small-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional small-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 11
The environment-friendly dry powder foaming agent for shield construction comprises 8 parts by weight of sodium dodecyl sulfate, 2 parts by weight of sodium dodecyl polyoxyethylene ether sulfate, 1 part by weight of sodium chloride, 2 parts by weight of xanthan gum, 2 parts by weight of polyethylene glycol, 1 part by weight of sodium benzoate and 1.5 parts by weight of SDS functionalized small-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional small-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Example 12
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of SDS functionalized small-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and SDS functional small-size graphene oxide sheets, uniformly stirring at 40 ℃, and then drying, crushing and sieving to obtain a dry powder substance.
Comparative example 1
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of CTAB functionalized large-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and CTAB functionalized large-size graphene oxide sheets, and uniformly stirring at 40 ℃ to obtain the modified graphene oxide.
Comparative example 2
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of CTAB functionalized medium-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and CTAB functionalized medium-size graphene oxide sheets, and uniformly stirring at 40 ℃ to obtain the modified graphene oxide.
Comparative example 3
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of CTAB functionalized small-size graphene oxide sheets.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, then adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and CTAB functionalized small-size graphene oxide sheets, and uniformly stirring at 40 ℃ to obtain the modified graphene oxide.
Comparative example 4
The environment-friendly dry powder foaming agent for shield construction comprises, by weight, 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol and 1 part of sodium benzoate.
The preparation method comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into 50 parts of deionized water, uniformly stirring, heating the solution to 40 ℃, adding sodium chloride, xanthan gum, polyethylene glycol and sodium benzoate, and uniformly stirring at 40 ℃.
Test case
The dry powder foaming agents obtained in the examples and the comparative examples are dissolved in deionized water, mixed according to the mass ratio of 2:8, and stirred uniformly for subsequent performance test.
Measurement of the foaming Rate: the foaming agent prepared in each example was added to a measuring cup, the pre-formulated foaming agent solution was foamed with a foaming device, the measuring cup machine was used to filter the bubble volume, and the indoor temperature was 30 ℃.
Bubble stability performance test: the stability of the dry powder foam was measured at 30 ℃, 35 ℃ and 40 ℃ respectively, and averaged. The time corresponding to a foam defoaming rate of 50% was noted as the half-life of the bubbles.
Corrosion rate: measured according to JB/T7901, wherein the specification of the 20# steel plate is 50 x 25 x 2mm, and the pore diameter is 3mm.
TABLE 1 Performance test results
| Foaming ratio (times) | Half-life(s) | Corrosion rate ((40.+ -. 2) °C,24 h) mm/a | |
| Example 1 | 12 | 700 | 0.091 |
| Example 2 | 11 | 710 | 0.084 |
| Example 3 | 13 | 717 | 0.077 |
| Example 4 | 12 | 718 | 0.071 |
| Example 5 | 11 | 1315 | 0.083 |
| Example 6 | 13 | 1310 | 0.072 |
| Example 7 | 12 | 1323 | 0.069 |
| Example 8 | 11 | 1387 | 0.066 |
| Example 9 | 13 | 729 | 0.087 |
| Example 10 | 12 | 741 | 0.072 |
| Example 11 | 11 | 737 | 0.071 |
| Example 12 | 11 | 712 | 0.066 |
| Comparative example 1 | 11 | 654 | 0.069 |
| Comparative example 2 | 12 | 678 | 0.071 |
| Comparative example 3 | 11 | 701 | 0.063 |
| Comparative example 4 | 6 | 520 | 0.154 |
The following conclusions can be drawn from the performance test of table 1: half-life of the middle-size graphene oxide sheets functionalized with SDS was longer in examples 5 to 8, while half-life of the large-size graphene oxide functionalized with SDS, the small-size graphene oxide functionalized with SDS, and the CTAB functionalized graphene were not greatly improved. Because the SDS functionalized medium-size graphene oxide sheets are more matched with bubbles, the gas in the bubbles is difficult to discharge, and the movement of liquid on the bubble liquid film is limited, so that the half-life period is improved. In addition, the anti-corrosion performance is improved when the graphene structure is added into the dry powder foaming agent.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The environment-friendly dry powder foaming agent for shield construction is characterized by comprising the following components in parts by weight: 5 to 10 parts of sodium dodecyl sulfate, 1 to 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.5 to 1 part of sodium chloride, 1.5 to 2 parts of xanthan gum, 1 to 2 parts of polyethylene glycol, 1 part of sodium benzoate and 0.5 to 2 parts of sodium dodecyl sulfate functionalized medium-size graphene oxide sheets;
The preparation method of the sodium dodecyl sulfate functionalized medium-size graphene oxide sheet layer comprises the following steps: dispersing a medium-size graphene oxide sheet into an ethanol solution of sodium dodecyl sulfate, performing ultrasonic treatment, washing the precipitate with ethanol to remove unreacted sodium dodecyl sulfate, and then drying at 30 ℃;
The preparation method of the medium-size graphene oxide sheet layer comprises the following steps: taking graphene oxide suspension, performing ultrasonic treatment at 500W power for 5min, centrifuging, and then freeze-drying;
The preparation method of the graphene oxide suspension comprises the following steps: adding KNO 3 and graphene into 98% sulfuric acid, stirring, then slowly adding KMnO 4,, heating the obtained mixed solution to 35 ℃, and stirring for 6h; then adding deionized water dropwise and stirring vigorously, maintaining the temperature of the solution at 80 ℃ for 30min; adding deionized water and H 2O2, centrifuging, washing and precipitating to neutrality, and diluting with deionized water to obtain graphene oxide suspension;
The preparation method of the dry powder foaming agent comprises the following steps: adding sodium dodecyl sulfate and sodium dodecyl polyoxyethylene ether sulfate into deionized water, stirring uniformly, heating the solution, adding sodium chloride, xanthan gum, polyethylene glycol, sodium benzoate and sodium dodecyl sulfate functionalized medium-size graphene oxide sheets, stirring uniformly, and then drying, crushing and sieving to obtain a dry powder substance.
2. The environment-friendly dry powder foaming agent for shield construction according to claim 1, which is characterized by comprising the following components in parts by weight: 7 to 10 parts of sodium dodecyl sulfate, 1.5 to 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 0.8 to 1 part of sodium chloride, 1.5 to 2 parts of xanthan gum, 1.5 to 2 parts of polyethylene glycol, 1 part of sodium benzoate and 1 to 2 parts of sodium dodecyl sulfate functionalized medium-size graphene oxide sheets.
3. The environment-friendly dry powder foaming agent for shield construction according to claim 1, which is characterized by comprising the following components in parts by weight: 10 parts of sodium dodecyl sulfate, 2 parts of sodium dodecyl polyoxyethylene ether sulfate, 100 parts of water, 1 part of sodium chloride, 2 parts of xanthan gum, 2 parts of polyethylene glycol, 1 part of sodium benzoate and 2 parts of sodium dodecyl sulfate functionalized medium-size graphene oxide sheets.
4. The environment-friendly dry powder foaming agent for shield construction according to claim 1, wherein the temperature of the solution heated in the preparation method of the dry powder foaming agent is 40 ℃.
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