CN113351109A - Switch type composite emulsifier containing boric acid-based surfactant and application thereof - Google Patents
Switch type composite emulsifier containing boric acid-based surfactant and application thereof Download PDFInfo
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Abstract
The invention relates to a switch type composite emulsifier containing boric acid-based surfactant, which is formed by dispersing inorganic nano particles in aqueous solution of the boric acid-based surfactant, and an ultra-stable emulsion can be prepared by adding the composite emulsifier into an oil phase or two phases of oil and water, and can be prepared by controlling pH value and CO2/N2The concentration is used for changing the molecular structure of the boric acid group surfactant and the surface wettability of the inorganic nano particles, and the rapid conversion between 'emulsification' and 'emulsion breaking' is realized, so that the boric acid group surfactant can be applied to occasions needing to keep the emulsion to be temporarily stable, has wide application prospects in various fields such as heterogeneous catalysis, emulsion polymerization and the like, has the characteristics of excellent sterilization, corrosion prevention, no toxicity, no pollution, easy biodegradation and the like, and greatly reduces the environmental pollution caused by the surfactant by combining the conversion characteristic of the prepared emulsionThe dyeing and the recovery difficulty are reduced, and the development concept of green chemistry is met.
Description
Technical Field
The invention relates to the technical field of emulsion preparation, in particular to a switch type composite emulsifier containing a boric acid-based surfactant and application thereof.
Background
Surfactants have important applications in the fields of mineral flotation, food, medicine, etc., but in many practical applications, it is often only necessary that the surfactant be surface active (emulsifiable, foaming, etc.) at some stage of the process, and not necessary to function after the process is completed. For example, in the process of oil recovery, it is common to add a certain amount of surfactant to the injection water to emulsify the underground oil with the injection water for enhanced oil recovery, and after obtaining an oil/water emulsion, it is desirable to rapidly break and stratify the emulsion to separate the oil. However, for the conventional surfactant-stabilized crude oil/water emulsion, the demulsification and separation process is often energy-consuming and causes problems of raw material waste, environmental pollution and the like. Therefore, conventional surfactants have not been able to meet the existing application requirements, and a new surfactant is needed to be developed to meet the diversified application requirements.
Different from the traditional surfactant, the stimulus-responsive surfactant (also called a switchable surfactant) has a molecular structure which is reversibly changed under the stimulation of an external environment, so that the surface (interface) tension of the surfactant is greatly changed, and the aggregates (such as micelles and the like) can be controllably and reversibly changed, and the change can simplify the operations of separating and recycling an aggregate system, greatly reduce the problems of environmental pollution, raw material waste and the like caused by the surfactant, and accord with the development concept of green chemistry.
Disclosure of Invention
The invention provides a method for preparing a boracic acid group-containing surfactantThe related composite emulsifier is added into oil phase or oil-water phase to obtain ultra-stable emulsion, and pH and CO can be controlled2/N2The structure of the boric acid-based surfactant and the surface wettability of the inorganic nano-particles are changed by the concentration, so that the rapid switching between 'emulsification' and 'emulsion breaking' is realized, the intellectualization of the emulsion is realized, and the method has wide application prospects in the fields of two-phase catalysis, emulsion polymerization and the like.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a switch type composite emulsifier containing a boric acid-based surfactant, which is formed by dispersing inorganic nano particles in an aqueous solution of the boric acid-based surfactant; the inorganic nano particles are nano metal oxides and/or nano metal salts; the boric acid-based surfactant is shown in the following structural formula:
wherein R is C1～C18A linear or branched, saturated or unsaturated, aromatic ring-containing or amide group-free alkyl group, a boronic acid group is located ortho, meta or para to the pyridine functional group, X is a metal ion, and the metal ion is sodium, potassium or calcium.
Further, the R is preferably dodecyl, tetradecyl, hexadecyl, octadecyl, 9-octadecenyl, isohexadecyl, or 3-carbonyl-tetradecyl.
The boric acid based surfactant has negative charge in water, and is pH and CO resistant2Has the stimulation response performance and is introduced with CO2Or when the pH value is adjusted to be less than 6, the surfactant is converted into pyridinium with positive charges and cannot be used for stabilizing the emulsion independently, and the boron-containing surfactant has the characteristics of excellent sterilization, corrosion prevention, wear resistance, flame retardance, static resistance, no toxicity, no public nuisance, easy biodegradation and the like.
Further, the primary particle size of the inorganic nano-particles is 10-5000nm, and the use concentration of the inorganic nano-particles based on the water phase is 0.1-0.5 wt%; the concentration of the emulsifier relative to the aqueous phase is 0.001-5.0 mmol/L.
Further, the inorganic nanoparticles are positively charged in the aqueous phase.
Further, the nano metal oxide is one or more of nano aluminum oxide, nano iron oxide, nano titanium oxide and nano magnesium oxide; the nano metal salt is nano calcium carbonate and/or nano calcium phosphate.
The inorganic nano particles are dispersed in the water phase, the particles are positively charged, and because boron atoms in the boric acid group of the boric acid group-containing surfactant in the water phase are negatively charged and the positive charges and the negative charges are mutually attracted, the inorganic nano particles can be adsorbed on the surfactant, so that the inorganic nano particles can obtain amphiphilic performance, and the emulsion can be stabilized.
Further, the pH of the aqueous phase is 6-8.
Further, the compound emulsifier is added into the oil phase or the oil phase and the water phase to form emulsion.
Further, the oil phase is one or more of polar organic matters immiscible with water, hydrocarbon mineral oil, triglyceride animal oil, gasoline, diesel oil or heavy oil.
Further, the volume fraction of the oil phase in the emulsion is 30% to 90%.
Further, the emulsion belongs to Pickering emulsion; the Pickering emulsion can be prepared by controlling the pH value or CO2/N2The concentration is used for regulating and controlling the conversion between emulsification and demulsification.
Further, the pH value regulation specifically comprises: adding an acid reagent into the emulsion, adjusting the pH of the system to be less than 6, demulsifying the emulsion, adding an alkali reagent into the demulsified system, adjusting the pH of the system to be more than 6.8, and homogenizing the system again to recover the emulsified state.
Further, the acid reagent is one or more of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid; the alkali reagent is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate.
Further, the CO is2/N2The concentration regulation and control specifically comprises the following steps: introducing carbon dioxide into the emulsion to break the emulsion, introducing gas into the system after breaking the emulsion or heating the system, and homogenizing the system again to recover the emulsified state; the gas is air or nitrogen, and the heating temperature is 30-80 ℃.
The invention also provides application of the switch type composite emulsifier containing the boric acid-based surfactant in the industries of food, cosmetics, pharmacy, pesticides, oil product transportation, crude oil drilling, machining, material synthesis, emulsion catalysis and emulsion explosives.
Further, the application of the compound emulsifier in emulsion catalysis is specifically as follows: and adding a composite emulsifier into the two-phase system to form an emulsion, promoting the reaction efficiency, and after the reaction is finished, regulating and controlling the pH of the system to be less than 6 and demulsifying the system.
Compared with the prior art, the invention has the beneficial effects that:
1. the emulsion prepared by the composite emulsifier has excellent stability, wherein the addition of the boric acid-based surfactant can reduce the surface tension in an emulsion system, and the boric acid group helps the surfactant to be adsorbed on the surface of inorganic nanoparticles, so that the inorganic nanoparticles obtain amphiphilic performance, a compact rigid particle adsorption layer can be formed on an oil-water interface, the aggregation between liquid drops is effectively prevented, an oil-water dispersion phase is further stabilized, and a stable emulsion system which can not be broken for more than 1 month can be obtained under the action of the composite emulsifier (the boric acid-based surfactant and the inorganic nanoparticles).
2. According to the switch type composite emulsifier containing the boric acid-based surfactant, the introduction of the inorganic nano particles reduces the dosage of the emulsifier added in the preparation of the emulsion, reduces the cost, and the boron surfactant has the characteristics of excellent sterilization, corrosion resistance, wear resistance, flame retardance, static resistance, no toxicity, no public nuisance, easy biodegradation and the like, has lower toxicity compared with the traditional surfactant, and is environment-friendly.
3. Compared with the existing stimulus-responsive small-molecule surfactant with a single component, the compound emulsifier is obtained by compounding the stimulus-responsive boric acid-based surfactant and inorganic nanoparticles, and is stimulated by external environment (such as pH value and CO)2Concentration change), the molecular structure of the boric acid-based surfactant is reversibly changed, so that the surface (interface) surface tension of the boric acid-based surfactant is greatly changed, and aggregates (such as micelles and the like) of the boric acid-based surfactant can be controllably and reversibly changed; in addition, the pH<6 hours and by CO2Then, the boric acid-based surfactant with negative overall charge is converted into pyridinium surfactant with positive charge, the surfactant is desorbed from the surface of the inorganic nano-particles, the particles lose the amphiphilic property, thereby causing the demulsification phenomenon, and the pH is readjusted>6.8 or nitrogen is introduced to recover the surfactant to be in an anionic state and adsorbed on the nanoparticle surfactant, so that the amphiphilic property of the nanoparticles is recovered again, the emulsion can be stabilized, and the rapid conversion between emulsification and demulsification is realized. Through the synergistic effect of the boric acid-based surfactant and the inorganic nanoparticles, the emulsion prepared by using the composite emulsifier has sensitive pH response performance and CO2/N2A reversible switch with double responsiveness, when a proper amount of acid (or CO is introduced) is dripped into the emulsion2) The emulsion is broken rapidly, and then proper amount of alkali is added (or N is introduced)2Air or heating) to form stable emulsion after the system is homogenized again, the particle size is not changed obviously, the system is stable as the initial state and can be repeated for many times, and economic, rapid and green regulation and control are realized.
Drawings
FIG. 1 is a chemical structural formula of sodium N-hexadecyl-pyridine-4-borate bromate;
FIG. 2 shows the pH and CO of sodium N-hexadecyl-pyridine-4-borate bromate2/N2(ii) a response of (d);
FIG. 3 is an apparent photograph of emulsions stabilized with different concentrations of N-hexadecyl-pyridine-4-boronic acid sodium bromide standing at room temperature for 12 hours;
FIG. 4 is an apparent photograph of emulsions stabilized with different concentrations of sodium N-hexadecyl-pyridine-4-borate bromide and nano calcium carbonate particles standing at room temperature for 24 hours;
FIG. 5 is an apparent photograph of emulsions stabilized with sodium N-hexadecyl-pyridine-4-borate bromide and nano-alumina particles at different concentrations, standing at room temperature for 24 hours;
FIG. 6 is a schematic of the acid-base response of an emulsion stabilized with sodium N-hexadecyl-pyridine-4-borate bromide in combination with alumina;
FIG. 7 CO of an emulsion stabilized with sodium N-hexadecyl-pyridine-4-borate bromide in combination with calcium carbonate2/N2Schematic control.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
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. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.
Example 1: emulsifying Properties of boric acid-based surfactant
The N-hexadecyl-pyridine-4-boric acid sodium bromide surfactant is a typical boric acid-based surfactant, has weak emulsifying capacity, is prepared by respectively preparing 0, 0.01, 0.5, 0.8, 1.0, 1.5, 2 and 2.5mmol/L of N-hexadecyl-pyridine-4-boric acid sodium bromide aqueous solution, adding N-octane to form an N-octane/water emulsion, and observing the state of the system after standing for 12 hours at room temperature.
FIG. 3 is an apparent photograph of an N-octane/water emulsion containing different amounts of N-hexadecyl-pyridine-4-boronic acid sodium bromide taken after the emulsion is allowed to stand at room temperature for 12 hours, and it can be seen from the figure that the system is in an oil-water separation state after the emulsion is allowed to stand at room temperature for 12 hours.
Example 2: emulsifying property of N-hexadecyl-pyridine-4-sodium borate bromide-0.1 wt% nano calcium carbonate composite emulsifier
0.002, 0.004, 0.01, 0.03, 0.05, 0.1 and 0.3mmol/L of N-hexadecyl-pyridine-4-boric acid sodium bromide solution is prepared respectively, 0.1 wt% of nano calcium carbonate particles are added into the solution respectively, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-octane was transferred to the vial as the oil phase. Homogenizing for 2min with a homogenizer at a rotation speed of 11000r/min to obtain stable emulsion.
And observing the state of the emulsion prepared by the composite emulsifier with different contents of the boric acid-based surfactant after standing for 24 hours at room temperature, wherein as shown in figure 4, the obtained emulsion is not demulsified.
In addition, 0.5mmol/L of N-hexadecyl-pyridine-4-boric acid sodium bromide solution was prepared, 0.1 wt% of nano calcium carbonate particles was added thereto, and dispersion was assisted by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-octane was transferred to the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 3: emulsifying property of N-hexadecyl-pyridine-4-sodium borate bromide-0.1 wt% nano alumina composite emulsifier
0, 0.002, 0.004, 0.01, 0.03, 0.05, 0.1, 0.3mmol/L of N-hexadecyl-pyridine-4-boric acid sodium bromide solution is prepared respectively, 0.1 wt% of nano alumina particles are added into the solution respectively, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-octane was transferred to the vial as the oil phase. Homogenizing for 2min with a homogenizer at a rotation speed of 11000r/min to obtain stable emulsion.
Observing the state of the emulsion prepared by the composite emulsifier with different boric acid-based surfactants after standing for 24 hours at room temperature, as shown in figure 5, the obtained emulsion is not completely demulsified, wherein the system with the content of the N-hexadecyl-pyridine-4-boric acid sodium bromide solution higher than 0.05mmol/L has better emulsification effect and stability.
In addition, 0.5mmol/L of N-hexadecyl-pyridine-4-boronic acid sodium bromide solution was prepared, to which 0.1 wt% nano-alumina particles were added and dispersed with the aid of an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-octane was transferred to the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 4: emulsifying property of N-tetradecyl-pyridine-4-sodium borate bromide-0.5 wt% nano calcium carbonate composite emulsifier
0.5mmol/L of N-tetradecyl-pyridine-4-boric acid sodium bromide solution is prepared, 0.5 wt% of nano calcium carbonate particles are added into the solution, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-octane was transferred to the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 5: emulsifying property of N-octadecyl-pyridine-4-boric acid potassium bromide-0.3 wt% nano magnesium oxide composite emulsifier
0.3mmol/L of N-octadecyl-pyridine-4-boric acid potassium bromide solution is prepared, 0.3 wt% of nano magnesium oxide particles are added into the solution, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-decane was removed from the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 6: emulsifying property of N-dodecyl-pyridine-4-sodium chloride borate-0.1 wt% nano alumina composite emulsifier
0.8mmol/L N-dodecyl-pyridine-4-sodium chloride borate solution is prepared, 0.1 wt% nanometer alumina particle is added into the solution, and ultrasonic processor is used to assist dispersion. 5mL of the aqueous phase was placed in a 25mL sample bottle, and 5mL of soybean oil was transferred to the bottle as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 7: emulsifying property of N-tetradecyl-pyridine-4-sodium borate bromide-0.4 wt% nano calcium phosphate composite emulsifier
0.5mmol/L N-tetradecyl-pyridine-4-boric acid sodium bromide solution is prepared, 0.1 wt% nanometer alumina particles are added into the solution, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample bottle, and 5mL of n-hexane was transferred into the bottle as an oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 8: emulsifying property of N-9-octadecenyl-pyridine-3-potassium borate bromide-0.3 wt% nano iron oxide composite emulsifier
0.5mmol/L of N-9-octadecenyl-pyridine-3-boric acid potassium bromide solution is prepared, 0.3 wt% of nano iron oxide particles are added into the solution, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-decane was removed from the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 9: emulsifying property of N-isohexadecane-pyridine-2-boric acid calcium bromide-0.5 wt% nano titanium oxide composite emulsifier
0.5mmol/L of N-isohexadecane-pyridine-2-boric acid calcium bromide solution is prepared, 0.5 wt% of nano titanium oxide particles are added into the solution, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-decane was removed from the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 10: emulsifying property of N-3-carbonyl-tetradecane-pyridine-2-boric acid calcium bromide-0.3 wt% nano-alumina composite emulsifier
0.5mmol/L of N-3-carbonyl-tetradecane-pyridine-2-boric acid calcium bromide solution is prepared, 0.3 wt% of nano alumina particles are added into the solution, and the solution is dispersed by an ultrasonic processor. 5mL of the aqueous phase was placed in a 25mL sample vial, and 5mL of n-decane was removed from the vial as the oil phase. Homogenizing for 2min to obtain stable emulsion at the rotation speed of 11000r/min, wherein the emulsion can be maintained at room temperature for 1 month without demulsification.
Example 11: pH controlled demulsification and emulsification
The emulsion prepared by using 0.5mmol/L N-hexadecyl-pyridine-4-boric acid sodium bromide and 0.1 wt% nano-alumina composite emulsifier in example 3 was subjected to pH response test, and as a result, as shown in FIG. 6, hydrochloric acid was added to the emulsion to adjust the pH to 5, the emulsion was rapidly separated by emulsion breaking, NaOH solution was added to the system to adjust the pH to 7, and the emulsion was obtained after re-homogenization. In addition, the stable/unstable state of the emulsion can be flexibly regulated and controlled by repeatedly and alternately adding the HCl solution and the NaOH solution. The micrograph in fig. 6 is an ultra-depth microscopic image of the more stable emulsion obtained by adjusting the pH of the emulsion twice and recovering the pH, respectively, by a metallographic microscope.
Example 12: CO 22/N2Regulated demulsification and emulsification
The emulsion prepared in example 2 using 0.5mmol/L N-hexadecyl-pyridine-4-boric acid sodium bromide-0.1 wt% nano calcium carbonate composite emulsifier was subjected to CO2In response to the test, the results are shown in FIG. 7, where CO was introduced into the prepared emulsion system2The emulsion is completely broken and separated, and then N is introduced into the emulsion2The re-homogenization of the system resulted in the formation of a stable emulsion, and the micrograph in FIG. 7 revealed no significant change in the emulsion before and after the stimulus response.
Example 13: CO 22Air-regulated demulsification and emulsification
The emulsion prepared from 0.5mmol/L N-tetradecyl-pyridine-4-boric acid sodium bromide-0.5 wt% nano calcium carbonate composite emulsifier used in example 4 was subjected to CO2In response to the test, CO was introduced into the prepared emulsion system2The emulsion is completely broken and separated, then air is introduced into the emulsion, and after re-homogenization, a stable emulsion can be formed again.
Example 14: CO 22Heating controlled demulsification and emulsification
The emulsion prepared in example 3 using 0.5mmol/L of N-hexadecyl-pyridine-4-boric acid sodium bromide-0.1 wt% of nano-alumina composite emulsifier was subjected to CO2In response to the test, CO was introduced into the prepared emulsion system2The emulsion can be completely broken and separated, then the system is heated to 40 ℃, and after re-homogenization, stable emulsion can be formed again.
The embodiment shows that the boric acid-based surfactant has weak emulsifying capacity, the emulsifying property of the composite emulsifier obtained by adding the inorganic nanoparticles is greatly improved, the content of the required boric acid-based surfactant is reduced, and the emulsion prepared from the composite emulsifier has excellent stability and can still keep a good emulsifying state after being placed at room temperature for 1 month; in addition, the emulsion prepared based on the composite emulsifier has sensitive pH response performance and CO2/N2The reversible switch with double responsivity can realize the intellectualization of the emulsion and has wide application prospect in a plurality of fields such as heterogeneous catalysis, emulsion polymerization and the like.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A switch type composite emulsifier containing a boric acid-based surfactant is characterized in that the composite emulsifier is formed by dispersing inorganic nanoparticles in an aqueous solution of the boric acid-based surfactant; the inorganic nano particles are nano metal oxides and/or nano metal salts; the boric acid-based surfactant is shown in the following structural formula:
wherein R is C1～C18A linear or branched, saturated or unsaturated, aromatic ring-containing or amide group-free alkyl group, a boronic acid group is located ortho, meta or para to the pyridine functional group, X is a metal ion, and the metal ion is sodium, potassium or calcium.
2. The switch type composite emulsifier containing the boric acid-based surfactant according to claim 1, wherein the nano metal oxide is one or more of nano aluminum oxide, nano iron oxide, nano titanium oxide and nano magnesium oxide; the nano metal salt is nano calcium carbonate and/or nano calcium phosphate.
3. The switch type composite emulsifier containing the boric acid-based surfactant according to claim 1, wherein the primary particle size of the inorganic nano-particles is 10-5000nm, and the use concentration based on the water phase is 0.1-0.5 wt%; the concentration of the boric acid group-containing surfactant relative to the aqueous phase is 0.001-5.0 mmol/L.
4. The switch type complex emulsifier containing borate surfactant as claimed in claim 3, wherein the pH of the aqueous phase is 6-8.
5. The switch type composite emulsifier containing the boric acid-based surfactant according to claim 1, wherein the composite emulsifier is added into an oil phase or an oil phase and a water phase to form an emulsion; the oil phase is one or more of polar organic matters, hydrocarbon mineral oil, triglyceride animal oil, gasoline, diesel oil or heavy oil which are not mutually soluble with water; the volume fraction of the oil phase in the emulsion is 30-90%.
6. The switch type composite emulsifier containing the boric acid-based surfactant as claimed in claim 5, wherein the emulsion belongs to Pickering emulsion; the Pickering emulsion can be prepared by controlling the pH value or CO2/N2The concentration is used for regulating and controlling the conversion between emulsification and demulsification.
7. The switch type composite emulsifier containing the borate surfactant according to claim 6, wherein the pH value regulation is specifically as follows: adding an acid reagent into the emulsion, adjusting the pH of the system to be less than 6, demulsifying the emulsion, adding an alkali reagent into the demulsified system, adjusting the pH of the system to be more than 6.8, and homogenizing the system again to recover the emulsified state; the acid reagent is one or more of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid, and the alkali reagent is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate.
8. The switch type composite emulsifier containing borate surfactant as claimed in claim 6, wherein the CO is selected from the group consisting of2/N2The concentration regulation and control specifically comprises the following steps: introducing carbon dioxide into the emulsion to break the emulsion, introducing gas into the system after breaking the emulsion or heating the system, and recovering the emulsified state after the system is homogenized again; the gas is air or nitrogen, and the heating temperature is 30-80 ℃.
9. Use of a boric acid based surfactant containing switching type complex emulsifier according to any one of claims 1 to 8 in food, cosmetic, pharmaceutical, pesticide, oil transportation, crude oil drilling, machining, material synthesis, emulsion catalysis and emulsion explosive industries.
10. The application of the boric acid based surfactant containing switch type composite emulsifier according to claim 9 is characterized in that the application of the composite emulsifier in emulsion catalysis is specifically as follows: and adding a composite emulsifier into the two-phase system to form an emulsion, promoting the reaction efficiency, and after the reaction is finished, regulating and controlling the pH of the system to be less than 6 and demulsifying the system.
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| CN101162634A (en) * | 2007-09-20 | 2008-04-16 | 华东师范大学 | Ion liquid based magnetofluid preparation method |
| CN104177390A (en) * | 2013-05-23 | 2014-12-03 | 中国药科大学 | Preparation method for pyridyl boric acid |
| US20160325256A1 (en) * | 2015-05-08 | 2016-11-10 | Christoffer Karl Abrahamsson | Methods and compositions for stimulus-controlled permeability |
| CN112657475A (en) * | 2020-12-02 | 2021-04-16 | 常州大学 | Boron affinity functionalized microsphere adsorbent and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162634A (en) * | 2007-09-20 | 2008-04-16 | 华东师范大学 | Ion liquid based magnetofluid preparation method |
| CN104177390A (en) * | 2013-05-23 | 2014-12-03 | 中国药科大学 | Preparation method for pyridyl boric acid |
| US20160325256A1 (en) * | 2015-05-08 | 2016-11-10 | Christoffer Karl Abrahamsson | Methods and compositions for stimulus-controlled permeability |
| CN112657475A (en) * | 2020-12-02 | 2021-04-16 | 常州大学 | Boron affinity functionalized microsphere adsorbent and preparation method and application thereof |
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