CN112551933A - Low-temperature foaming agent for foamed light soil - Google Patents
Low-temperature foaming agent for foamed light soil Download PDFInfo
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- CN112551933A CN112551933A CN202011598747.3A CN202011598747A CN112551933A CN 112551933 A CN112551933 A CN 112551933A CN 202011598747 A CN202011598747 A CN 202011598747A CN 112551933 A CN112551933 A CN 112551933A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/42—Pore formers
Abstract
The invention discloses a low-temperature foaming agent for foamed light soil, which comprises, by weight, 30-50 parts of modified alpha-alkenyl sodium sulfonate, 10-30 parts of dodecyl benzyl ammonium chloride, 5-20 parts of polyethyleneimine, 1-5 parts of a foam stabilizer, 1-3 parts of an anti-caking agent, 10-15 parts of a solvent and 0.5-1 part of an acid substance. The alpha-sodium alkenyl sulfonate is modified, so that the foaming agent has higher foaming rate, enhances the low-temperature water solubility, and greatly improves the saline-alkali resistance. The modified alpha-alkenyl sodium sulfonate and the dodecyl methyl benzyl ammonium chloride generate synergistic effect, and the foam stability is enhanced. The foaming agent has high foaming ratio due to the synergistic effect of the components of the formula, the generated foam is uniform and fine, the foam wall is stable, and independent closed bubbles form a bubble group; good stability in cement slurry or slurry, uniform and independent honeycomb pores of the hardened foam light soil, no large air bubbles, suitability for low-temperature environment and the like.
Description
Technical Field
The invention relates to the technical field of foaming agents, in particular to a low-temperature foaming agent for foamed light soil.
Background
The foamed light soil is a light material prepared by preparing foaming agent aqueous solution into foam by a physical method, mixing and stirring the foam with necessary components of cement-based cementing material, water and optional components of aggregate, admixture and the like according to a certain proportion, and hardening through physical and chemical actions. The foaming agent is one of the important components for producing the foamed lightweight soil, and is the main condition and material basis for forming the foamed lightweight soil. According to different gas production modes, foaming agents are divided into two categories of physical foaming agents and chemical foaming agents. The foaming principle of the physical foaming agent is that an bilayer structure formed by surface active matters in a foaming agent solution wraps air to form bubbles. The foaming principle of the chemical foaming agent is that the foaming agent reacts with a base material to release new gas to generate bubbles.
The high-quality foaming agent for the foamed light soil is required to meet the requirements of high foaming rate, the generated foam is uniform and fine, the foam wall is stable, and independent closed bubbles form a bubble group; the stability in cement slurry or slurry is good, and the honeycomb pores of the hardened foam light soil are uniform and independent without large air bubbles and other conditions.
The invention aims to provide a low-temperature foaming agent for foamed lightweight soil, which has the characteristics of high foaming rate, good foam stability and the like, has low-temperature resistance and can be suitable for being used at lower environmental temperature.
Disclosure of Invention
In order to solve the problems, the invention provides a low-temperature foaming agent for foamed lightweight soil, which comprises 30-50 parts by weight of modified alpha-alkenyl sodium sulfonate, 10-30 parts by weight of dodecyl methyl benzyl ammonium chloride, 5-20 parts by weight of polyethyleneimine, 1-5 parts by weight of a foam stabilizer, 1-3 parts by weight of an anticaking agent, 10-15 parts by weight of a solvent and 0.5-1 part by weight of an acid substance.
As a preferable technical scheme, the modified alpha-sodium alkenyl sulfonate is acrylamide modified alpha-sodium alkenyl sulfonate.
As a preferable technical scheme, the content of active substances of the dodecyl benzyl ammonium chloride is more than or equal to 80 percent.
As a preferable technical scheme, the viscosity (mpa.s-25 ℃) of the polyethyleneimine is 1500-16000.
As a preferable technical scheme, the foam stabilizer is polyisobutylene.
As a preferable technical scheme, the number average molecular weight of the polyisobutene is 900-2500.
As a preferable technical scheme, the anticaking agent is a mixture of white carbon black and talcum powder, and the mass ratio of the white carbon black to the talcum powder is 0.3-0.5: 1.
as a preferable technical scheme, the particle size of the white carbon black is 1250-1500 meshes.
As a preferred technical scheme, the particle size of the talcum powder is 3000-5000 meshes.
The second aspect of the present invention also provides a preparation method of the low temperature foaming agent for foamed lightweight soil, which comprises the following steps:
s1, modification of alpha-olefin sodium sulfonate: placing alpha-olefin sodium sulfonate, acrylamide and an initiator in a reaction bottle, adding water, stirring and heating to 50-55 ℃, carrying out thermal polymerization reaction for 4-6h, adding a formaldehyde solution, reacting for 1-2h, then dropwise adding an ethylenediamine solution, and reacting for 3-4h to obtain the modified alpha-olefin sodium sulfonate.
S2, preparation of foaming agent: the modified alpha-sodium alkenyl sulfonate, dodecyl methyl benzyl ammonium chloride, polyethyleneimine, a foam stabilizer, an anticaking agent, a solvent and an acid substance are sequentially added into a stirring tank according to a ratio, and are stirred and mixed for 0.5-1h under the conditions that the stirring speed is 50-500 r/min and the reaction temperature is 30-70 ℃ to obtain the low-temperature foaming agent for the foamed lightweight soil.
Advantageous effects
The alpha-sodium alkenyl sulfonate is modified, so that the foaming agent has higher foaming rate, enhances the low-temperature water solubility, and greatly improves the saline-alkali resistance. The modified alpha-alkenyl sodium sulfonate and the dodecyl methyl benzyl ammonium chloride generate synergistic effect, and the foam stability is enhanced. The foaming agent has high foaming ratio due to the synergistic effect of the components of the formula, the generated foam is uniform and fine, the foam wall is stable, and independent closed bubbles form a bubble group; good stability in cement slurry or slurry, uniform and independent honeycomb pores of the hardened foam light soil, no large air bubbles, suitability for low-temperature environment and the like.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
In order to solve the problems, the invention provides a low-temperature foaming agent for foamed lightweight soil, which comprises 30-50 parts by weight of modified alpha-alkenyl sodium sulfonate, 10-30 parts by weight of dodecyl methyl benzyl ammonium chloride, 5-20 parts by weight of polyethyleneimine, 1-5 parts by weight of a foam stabilizer, 1-3 parts by weight of an anticaking agent, 10-15 parts by weight of a solvent and 0.5-1 part by weight of an acid substance.
In some preferred embodiments, the modified sodium alpha-alkenyl sulfonate is acrylamide modified sodium alpha-alkenyl sulfonate. The alpha-sodium alkenyl sulfonate is an anionic surfactant with super foaming capacity, has low toxicity, small irritation to skin, mild performance and good low-temperature water solubility, so that the prepared foaming agent is suitable for low-temperature environment; but is susceptible to the electrolyte content in the system due to SO in the molecular structure of sodium alpha-alkenyl sulfonate3 2-Encounter with Ca2+、Mg2+When polyvalent cations are used, precipitates are easily generated, so that the foaming property and the foam stability of the system are influenced, and in the system, acrylamide and ethylenediamine are used for modifying the system, so that the system has stronger salt resistance, and the foaming property and the foam stability of the system are improved.
Sodium alpha-alkenyl sulfonate is commercially available in the present invention, as purchased from Guangzhou Baxon chemical Co., Ltd, grade: industrial grade.
In some preferred embodiments, the dodecyl benzyl ammonium chloride has an active content of 80% or more.
The dodecyl methyl benzyl ammonium chloride is added into the foaming agent because the dodecyl methyl benzyl ammonium chloride and the modified alpha-alkenyl sodium sulfonate in the system can generate a synergistic effect, so that the surface and interface tension of the system is reduced; because of the electric attraction between the dodecyl benzyl ammonium chloride and the modified alpha-sodium olefin sulfonate, the electric repulsion between surface active ions in the adsorption layer is weakened by the charge action, so that the surface adsorption is increased, and the compound system has very low surface and interface tension and increases the foaming multiplying power. The dodecyl methyl benzyl ammonium chloride with the active matter content of more than or equal to 80 percent is selected in the invention because the molecules in the adsorption layer of the dodecyl methyl benzyl ammonium chloride with higher active matter content are arranged more closely, and when the dodecyl methyl benzyl ammonium chloride with higher active matter content acts with the modified alpha-alkenyl sodium sulfonate, stronger interaction is generated among the molecules, so that the surface viscosity is increased, the mechanical strength of a surface film is increased, the surface film is not easy to break under the action of external force, the gas permeability is reduced, the foam life is prolonged, and the foam stability is good.
The dodecyl methyl benzyl ammonium chloride can be purchased from the North China Fine chemical Co., Ltd, and the content of active substances is more than or equal to 80 percent.
In some preferred embodiments, the polyethyleneimine has a viscosity (mpa.s-25 ℃) of 1500 to 16000. Polyethyleneimine with the viscosity (mpa.s-25 ℃) of 1500-16000 is also added into the system, the polyethyleneimine is typical water-soluble polyamine, and the polyethyleneimine has strong proton affinity due to abundant nitrogen atoms on a macromolecular chain, and can generate a synergistic effect with the modified alpha-alkenyl sodium sulfonate in the system, so that the polyethyleneimine has excellent low-temperature resistance; the viscosity (mpa.s-25 ℃) is selected to be in the range of 1500-16000, because when the viscosity (mpa.s-25 ℃) is lower than 1500, formed bubbles are mostly in a two-sided body, the surface tension is large, and the bubble stability is poor; when the viscosity (mpa.s-25 ℃) is higher than 16000, the viscosity of the system is too high, so that the foaming ratio is reduced; when the viscosity (mpa.s-25 ℃) is in the range of 1500-16000, the bubbles are mostly polyhedral, and the interface of the intersected boundaries of the polyhedral bubbles is curved, namely the surface tension is small, so that the foam liquid drainage is slow, and the foam stability is strong.
The polyethyleneimine of the present invention is commercially available from Ganbuke New Material science and technology (Shanghai) Co., Ltd.
In some preferred embodiments, the foam stabilizer is polyisobutylene.
In some preferred embodiments, the polyisobutylene has a number average molecular weight of 900 to 2500. The foam stabilizer disclosed by the invention selects polyisobutylene with the number average molecular weight of 900-2500, and the reason is that in the system, the viscosity (mpa.s-25 ℃) of polyethyleneimine is selected within 1500-16000, and the high stability and the high foaming ratio of foaming agent foam are ensured under the combined action of the polyisobutylene and the polyethyleneimine, so that the honeycomb pores of the hardened foamed lightweight soil are uniform and independent and have no large bubbles.
Polyisobutylene is available from Shandong Hongrui New Material science and technology, Inc. in the present invention.
In some preferred embodiments, the anticaking agent is a mixture of white carbon black and talc powder, and the mass ratio of the white carbon black to the talc powder is 0.3-0.5: 1.
in some preferred embodiments, the white carbon black has a particle size of 1250 to 1500 meshes.
In some preferred embodiments, the talc powder has a particle size of 3000 to 5000 mesh.
According to the invention, the anticaking agent is a mixture of white carbon black with the particle size of 1250-1500 meshes and talcum powder with the particle size of 3000-5000 meshes, and the white carbon black and the talcum powder with different particle sizes are selected to act together, so that the anticaking property of the foaming agent is ensured, and the influence on the foaming multiplying power is reduced; and the stability of the foaming agent in slurry is enhanced by adding the white carbon black and the talcum powder into the system for mixing.
The white carbon black can be purchased from Shandong Hongxing white carbon black Limited liability company, and the type is as follows: hx 728-11; talc powder is available from commercial limited le hua city, changzhou.
In some preferred embodiments, the solvent is one of ethanol, propanol, isopropanol, or pentaerythritol; preferably isopropanol.
In some preferred embodiments, the acid is one of oxalic acid, citric acid, or stearic acid; citric acid is preferred.
The second aspect of the present invention also provides a preparation method of the low temperature foaming agent for foamed lightweight soil, which comprises the following steps:
s1, modification of alpha-olefin sodium sulfonate: adding alpha-olefin sodium sulfonate and acrylamide into a reaction bottle, wherein the mass ratio of the alpha-olefin sodium sulfonate to the acrylamide is 1: 2, adding an initiator accounting for 0.1 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide and water accounting for 20 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide, stirring and heating to 50-55 ℃, carrying out thermal polymerization reaction for 4-6h, adding a formaldehyde solution, reacting for 1-2h, dropwise adding an ethylenediamine solution, and reacting for 3-4h (the mass ratio of the acrylamide, the formaldehyde and the ethylenediamine is 1: 0.5: 0.75), thus obtaining the modified alpha-olefin sodium sulfonate.
S2, preparation of foaming agent: the modified alpha-sodium alkenyl sulfonate, dodecyl methyl benzyl ammonium chloride, polyethyleneimine, a foam stabilizer, an anticaking agent, a solvent and an acid substance are sequentially added into a stirring tank according to a ratio, and are stirred and mixed for 0.5-1h under the conditions that the stirring speed is 50-500 r/min and the reaction temperature is 30-70 ℃ to obtain the low-temperature foaming agent for the foamed lightweight soil.
The initiator is ammonium persulfate (CAS number: 7727-54-0).
The acrylamide was purchased from mcelin, CAS No.: 79-06-1.
The ethylene diamine was purchased from Michael.
Examples
The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples. Unless otherwise specified, all the raw materials in the present invention are commercially available.
Example 1
Embodiment 1 provides a low-temperature foaming agent for foamed lightweight soil, which comprises, by weight, 30 parts of modified alpha-alkenyl sodium sulfonate, 30 parts of dodecyl benzyl ammonium chloride, 5 parts of polyethyleneimine, 1 part of a foam stabilizer, 3 parts of an anti-caking agent, 15 parts of a solvent, and 0.5 part of an acid substance.
The modified alpha-sodium alkenyl sulfonate is acrylamide modified alpha-sodium alkenyl sulfonate.
The active matter content of the dodecyl benzyl ammonium chloride is more than or equal to 80 percent (manufacturer: Zhongbei Fine chemical Co., Ltd.).
The viscosity (mpa.s-25 ℃) of the polyethyleneimine is 1500-13500 (manufacturer: Ganbuk New Material science and technology (Shanghai) Co., Ltd., model: GBK-PEI 9).
The foam stabilizer is polyisobutylene, and the number average molecular weight of the polyisobutylene is 900-1150 (the manufacturer: Shandong Hongyui New Material science and technology Co., Ltd., model: HRD-10H).
The anticaking agent is a mixture of white carbon black and talcum powder, and the mass ratio of the white carbon black to the talcum powder is 0.3: 1; the particle size of the white carbon black is 1250-1500 meshes (the manufacturer: Shandong Hongxing white carbon black Limited liability company, the model: hx 728-11); the particle size of the talcum powder is 3000 meshes (the manufacturer: Changzhou Lehuahua commercial Co., Ltd., model: LH-3000 meshes).
The solvent is isopropanol.
The acid substance is citric acid.
The embodiment also provides a preparation method of the low-temperature foaming agent for the foamed lightweight soil, which comprises the following steps:
s1, modification of alpha-olefin sodium sulfonate: adding alpha-olefin sodium sulfonate and acrylamide into a reaction bottle, wherein the mass ratio of the alpha-olefin sodium sulfonate to the acrylamide is 1: 2, adding an initiator accounting for 0.1 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide and water accounting for 20 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide, stirring and heating to 50 ℃, carrying out thermal polymerization reaction for 6 hours, adding a formaldehyde solution, reacting for 1 hour, dropwise adding an ethylenediamine solution, and reacting for 3 hours (the mass ratio of the acrylamide, the formaldehyde and the ethylenediamine is 1: 0.5: 0.75), thus obtaining the modified alpha-olefin sodium sulfonate.
S2, preparation of foaming agent: the modified alpha-sodium alkenyl sulfonate, dodecyl methyl benzyl ammonium chloride, polyethyleneimine, a foam stabilizer, an anticaking agent, a solvent and an acid substance are sequentially added into a stirring tank according to the proportion, and are stirred and mixed for 1h under the conditions that the stirring speed is 50r/min and the reaction temperature is 70 ℃ to obtain the low-temperature foaming agent for the foamed lightweight soil.
Example 2
Embodiment 2 provides a low-temperature foaming agent for foamed lightweight soil, which comprises, by weight, 50 parts of modified alpha-sodium alkenyl sulfonate, 10 parts of dodecyl benzyl ammonium chloride, 20 parts of polyethyleneimine, 5 parts of a foam stabilizer, 3 parts of an anti-caking agent, 15 parts of a solvent, and 1 part of an acid substance.
The modified alpha-sodium alkenyl sulfonate is acrylamide modified alpha-sodium alkenyl sulfonate.
The active matter content of the dodecyl benzyl ammonium chloride is more than or equal to 80 percent (manufacturer: Zhongbei Fine chemical Co., Ltd.).
The viscosity (mpa.s-25 ℃) of the polyethyleneimine is 2200-15800 (manufacturer: Ganbuk New Material science and technology (Shanghai) Co., Ltd., model number: GBK-PEI 7).
The foam stabilizer is polyisobutylene, and the number average molecular weight of the polyisobutylene is 1900-2500 (the manufacturer: Shandong Hongyui New Material science and technology Co., Ltd., model: HRD-23H).
The anticaking agent is a mixture of white carbon black and talcum powder, and the mass ratio of the white carbon black to the talcum powder is 0.5: 1; the particle size of the white carbon black is 1250-1500 meshes (the manufacturer: Shandong Hongxing white carbon black Limited liability company, the model: hx 728-11); the particle size of the talcum powder is 5000 meshes (the manufacturer: Lehua Huayuanqi limited company in Changzhou city, model: LH-5000 meshes).
The solvent is isopropanol.
The acid substance is citric acid.
The embodiment also provides a preparation method of the low-temperature foaming agent for the foamed lightweight soil, which comprises the following steps:
s1, modification of alpha-olefin sodium sulfonate: adding alpha-olefin sodium sulfonate and acrylamide into a reaction bottle, wherein the mass ratio of the alpha-olefin sodium sulfonate to the acrylamide is 1: 2, adding an initiator accounting for 0.1 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide and water accounting for 20 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide, stirring and heating to 55 ℃, carrying out thermal polymerization reaction for 4 hours, adding a formaldehyde solution, reacting for 2 hours, dropwise adding an ethylenediamine solution, and reacting for 4 hours (the mass ratio of the acrylamide, the formaldehyde and the ethylenediamine is 1: 0.5: 0.75), thus obtaining the modified alpha-olefin sodium sulfonate.
S2, preparation of foaming agent: the modified alpha-sodium alkenyl sulfonate, the dodecyl methyl benzyl ammonium chloride, the polyethyleneimine, the foam stabilizer, the anticaking agent, the solvent and the acid substance are sequentially added into a stirring tank according to the proportion, and are stirred and mixed for 0.5h under the conditions that the stirring speed is 500r/min and the reaction temperature is 30 ℃ to obtain the low-temperature foaming agent for the foamed lightweight soil.
Example 3
Embodiment 3 provides a low-temperature foaming agent for foamed lightweight soil, which comprises, by weight, 40 parts of modified alpha-sodium alkenyl sulfonate, 20 parts of dodecyl benzyl ammonium chloride, 15 parts of polyethyleneimine, 3 parts of a foam stabilizer, 2 parts of an anti-caking agent, 13 parts of a solvent, and 1 part of an acid substance.
The modified alpha-sodium alkenyl sulfonate is acrylamide modified alpha-sodium alkenyl sulfonate.
The active matter content of the dodecyl benzyl ammonium chloride is more than or equal to 80 percent (manufacturer: Zhongbei Fine chemical Co., Ltd.).
The viscosity (mpa.s-25 ℃) of the polyethyleneimine is 1500-13500 (manufacturer: Ganbuk New Material science and technology (Shanghai) Co., Ltd., model: GBK-PEI 9).
The foam stabilizer is polyisobutylene, and the number average molecular weight of the polyisobutylene is 1200-1600 (the manufacturer: the model: HRD-13H of New Material science and technology Co., Ltd., Shandong Hongyui).
The anticaking agent is a mixture of white carbon black and talcum powder, and the mass ratio of the white carbon black to the talcum powder is 0.4: 1; the particle size of the white carbon black is 1250-1500 meshes (the manufacturer: Shandong Hongxing white carbon black Limited liability company, the model: hx 728-11); the particle size of the talcum powder is 5000 meshes (the manufacturer: Lehua Huayuanqi limited company in Changzhou city, model: LH-5000 meshes).
The solvent is isopropanol.
The acid substance is citric acid.
The embodiment also provides a preparation method of the low-temperature foaming agent for the foamed lightweight soil, which comprises the following steps:
s1, modification of alpha-olefin sodium sulfonate: adding alpha-olefin sodium sulfonate and acrylamide into a reaction bottle, wherein the mass ratio of the alpha-olefin sodium sulfonate to the acrylamide is 1: 2, adding an initiator accounting for 0.1 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide and water accounting for 20 percent of the total mass of the alpha-olefin sodium sulfonate and the acrylamide, stirring and heating to 55 ℃, carrying out thermal polymerization for 5 hours, adding a formaldehyde solution, reacting for 2 hours, dropwise adding an ethylenediamine solution, and reacting for 3 hours (the mass ratio of the acrylamide, the formaldehyde and the ethylenediamine is 1: 0.5: 0.75), thus obtaining the modified alpha-olefin sodium sulfonate.
S2, preparation of foaming agent: the modified alpha-sodium alkenyl sulfonate, dodecyl methyl benzyl ammonium chloride, polyethyleneimine, a foam stabilizer, an anticaking agent, a solvent and an acid substance are sequentially added into a stirring tank according to a ratio, and are stirred and mixed for 1h under the conditions that the stirring speed is 250r/min and the reaction temperature is 60 ℃ to obtain the low-temperature foaming agent for the foamed lightweight soil.
Comparative example 1
The sodium alpha-olefin sulfonate was not modified (manufacturer: purchased from Guangzhou Baosen chemical Co., Ltd., grade: technical grade), and the step S1 was deleted, and the remainder was the same as in example 3.
Comparative example 2
The content of active substance of dodecyl benzyl ammonium chloride was changed to 44% or more (manufacturer: Zhongbei Fine chemical Co., Ltd.), and the rest is the same as in example 3.
Comparative example 3
The viscosity (mpa.s-25 ℃) of polyethyleneimine was changed to 8300-97900 (manufacturer: Bibi New materials science and technology (Shanghai) Co., Ltd., model: GBK-PEI 3), and the rest was the same as in example 3.
Comparative example 4
The number average molecular weight of the polyisobutylene was changed to 320 (manufactured by Shanghai chess, Inc., model: L-8), and the rest was the same as in example 3.
Comparative example 5
The number average molecular weight of polyisobutylene was changed to 6000 (manufacturer: Shanghai chess, Ltd., model: H-18000), and the rest was the same as in example 3.
Comparative example 6
The anticaking agent is changed into single white carbon black with the particle size of 1250-1500 meshes (the manufacturer: Shandong Hongxing white carbon black LLC, model: hx728-11), and the rest is the same as the example 3.
Comparative example 7
The anti-caking agent was changed to a single talc powder having a particle size of 5000 mesh (type LH-5000 mesh, manufactured by Lehuan Hua commercial Co., Ltd., Changzhou city), and the rest was the same as in example 3.
Performance testing
1. Foaming ratio: the foaming agents prepared in examples 1 to 3 and comparative examples 1 to 7 were diluted by 30 times with water to obtain foaming solutions, the foaming solutions were placed in a test foaming apparatus, a foaming gun was adjusted to foam, and then a volumetric cylinder was used to hold the foam and weigh the foam density ρ, and the foaming ratio was calculated according to the following formula:
M＝N*(1000/ρ)；
wherein:
m is foaming multiplying power, is dimensionless and takes an integer;
n-dilution multiplying power, dimensionless, get the integer;
rho-measured foam density, g/cm 3; specific values are shown in table 1.
2. Stability: the foam stability is foam bleeding rate (the time for the foam to be stable and not broken in the air after the foam is generated is measured to judge the foam stability of the foaming agent), and the greater the bleeding rate is, the poorer the stability of the foaming agent is.
(1) Respectively adding water to dilute the foaming agents prepared in the examples 1-3 and the comparative examples 1-7 by 30 times under the standard condition of 20 +/-2 ℃ to obtain foaming liquid, placing the foaming liquid in a test foaming device, adjusting the foaming of a foaming gun, taking foam in a volumetric cylinder, weighing the foam density rhowAnd observing whether the foam particles are uniform and fine and whether the foam flow is complete.
(2) Peeling an organic glass measuring cylinder on an electronic scale, opening a foaming gun to take foam to fill the measuring cylinder, simultaneously starting timing immediately by a stopwatch and scraping the measuring cylinder immediately to enable the foam to be level with a cylinder opening, wiping the outer wall of the cylinder cleanly, and weighing the net weight m of the foamq(ii) a Standing the weighed foam at a windless place, and reading the scale of the liquid level of the bleeding water at the bottom end of the measuring cylinder, namely the volume V of the foaming liquid, for 1 time every 5 minuteswUntil the stopwatch reaches 30 minutes.
The foam bleeding rate was calculated as follows:
α＝{(Vw*ρw)/mq}*100％
wherein:
vwmeasuring time and accumulating the weight of the foaming liquid aqueous solution after defoaming;
ρw-the net weight of foam in the volumetric cylinder;
mq-net weight of foam; specific values are shown in table 1.
3. Low temperature resistance: the foaming agents prepared in examples 1-3 and comparative examples 1-7 were diluted 30 times with water, and then placed in a low temperature test chamber (at 5 ℃ in the chamber), and after 72 hours, the foaming agents were observed to see if flocculation, layered precipitation, crystallization, etc., as shown in Table 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The low-temperature foaming agent for the foamed light soil is characterized by comprising, by weight, 30-50 parts of modified alpha-alkenyl sodium sulfonate, 10-30 parts of dodecyl methyl benzyl ammonium chloride, 5-20 parts of polyethyleneimine, 1-5 parts of a foam stabilizer, 1-3 parts of an anti-caking agent, 10-15 parts of a solvent and 0.5-1 part of an acid substance.
2. The low-temperature foaming agent for the foamed lightweight soil as claimed in claim 1, wherein the modified sodium α -alkenyl sulfonate is acrylamide-modified sodium α -alkenyl sulfonate.
3. The low-temperature foaming agent for the foamed lightweight soil as claimed in claim 1, wherein the active content of the dodecyl methyl benzyl ammonium chloride is not less than 80%.
4. The low-temperature foaming agent for foamed lightweight soil according to claim 1, wherein the polyethyleneimine has a viscosity of 1500 to 16000mpa.s at a temperature of 25 ℃.
5. The low-temperature foaming agent for foamed lightweight soil according to claim 1, wherein the foam stabilizer is polyisobutylene.
6. The low-temperature foaming agent for foamed lightweight soil according to claim 5, wherein the number average molecular weight of the polyisobutylene is 900 to 2500.
7. The low-temperature foaming agent for the foamed lightweight soil as claimed in claim 1, wherein the anti-caking agent is a mixture of white carbon black and talcum powder, and the mass ratio of the white carbon black to the talcum powder is 0.3-0.5: 1.
8. the low-temperature foaming agent for the foamed lightweight soil as claimed in claim 7, wherein the white carbon black has a particle size of 1250 to 1500 meshes.
9. The low-temperature foaming agent for the foamed lightweight soil as claimed in claim 7, wherein the particle size of the talc powder is 3000-5000 mesh.
10. A method for preparing a low-temperature foaming agent for foamed lightweight soil according to any one of claims 1 to 9, comprising the steps of:
s1, modification of alpha-olefin sodium sulfonate: placing alpha-olefin sodium sulfonate, acrylamide and an initiator in a reaction bottle, adding water, stirring and heating to 50-55 ℃, carrying out thermal polymerization reaction for 4-6h, adding a formaldehyde solution, reacting for 1-2h, then dropwise adding an ethylenediamine solution, and reacting for 3-4h to obtain modified alpha-olefin sodium sulfonate;
s2, preparation of foaming agent: the modified alpha-sodium alkenyl sulfonate, dodecyl methyl benzyl ammonium chloride, polyethyleneimine, a foam stabilizer, an anticaking agent, a solvent and an acid substance are sequentially added into a stirring tank according to a ratio, and are stirred and mixed for 0.5-1h under the conditions that the stirring speed is 50-500 r/min and the reaction temperature is 30-70 ℃ to obtain the low-temperature foaming agent for the foamed lightweight soil.
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| CN113754371A (en) * | 2021-08-30 | 2021-12-07 | 广东盛瑞科技股份有限公司 | Foamed light soil with high stone powder content and preparation method thereof |
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