Oil-water universal nano organic clay and preparation method thereof

Abstract

The invention provides nano organic clay universal for oil and water. The nano organic clay comprises the following components in parts by weight: 60-80 parts of montmorillonite, 30-40 parts of hydrotalcite and 20-40 parts of polyhydroxy quaternary ammonium salt, wherein the structural formula of the polyhydroxy quaternary ammonium salt is shown in the specification, in the formula, R1 is a C1-C29 straight chain alkyl group, R2 is a C1-C10 straight chain or branched chain, saturated or unsaturated alkyl group, or aromatic hydrocarbon group, R3 is a C1-C10 straight chain or branched chain, saturated or unsaturated alkyl group, R4 is a C1-C10 straight chain or branched chain, saturated or unsaturated alkyl group, and M is Cl or Br. In an oily system, a long carbon chain of the polyhydroxy quaternary ammonium salt extends outwards, so that the clay shows excellent lipophilicity and can be efficiently thickened as traditional organic clay; in a water-based system, polyhydroxy groups extend outwards to provide strong hydration and steric hindrance, so that the clay can be dispersed and thickened like a high-performance synthetic thickening agent, and the clay can show high and stable viscosity and thixotropic index in various media under the same addition amount.

Description

Technical Field

[0001] This invention relates to the field of modified montmorillonite technology, and more particularly to an oil-water universal nano-organic clay and its preparation method. Background Technology

[0002] Rheology modifiers are chemical additives used to adjust the flow characteristics of water-based coatings, inks, and other systems. They influence production, storage, and application performance by adjusting the relationship between viscosity and shear force.

[0003] Rheology modifiers (RMDs) are used in aqueous formulations to adjust the molecular weight of base materials by replacing them with thickeners. They are mainly divided into inorganic (bentonite) and organic (polyurethane, polyurea, acrylic acid) types. Inorganic RMDs achieve thixotropic thickening through charge interactions or three-dimensional network structures. For example, bentonite forms a carob-like network, and sepiolite constructs fiber suspensions. However, bentonite-based RMDs are rarely universally applicable in both aqueous and oil-based systems. Summary of the Invention

[0004] The main objective of this invention is to propose a universal oil-water nano-organic clay and its preparation method, aiming to solve the technical problem that existing rheology modifiers cannot be universally used in both aqueous and oil-based systems.

[0005] To achieve the above objectives, this invention proposes an oil-water universal nano-organic clay, comprising the following components by weight: 60-80 parts montmorillonite, 30-40 parts hydrotalcite, and 20-40 parts polyhydroxy quaternary ammonium salt. The structural formula of the polyhydroxy quaternary ammonium salt is as follows: , In the formula, R1 is C1-C 29 straight-chain alkyl groups R2 is C1-C 10 Straight-chain or branched, saturated or unsaturated alkyl groups, or aromatic hydrocarbon groups. R3 is C1-C 10 Straight-chain or branched, saturated or unsaturated alkyl groups, R4 is C1-C 10 Straight-chain or branched, saturated or unsaturated alkyl groups, M is either Cl or Br.

[0006] Optionally, the product may include the following components by weight: 70-80 parts montmorillonite, 30-35 parts hydrotalcite, and 5-10 parts polyhydroxy quaternary ammonium salt.

[0007] Optionally, in the structural formula of the polyhydroxy quaternary ammonium salt, R1 is CH3(CH2). n n=12~29.

[0008] Optionally, in the structural formula of the polyhydroxy quaternary ammonium salt, R2 is (CH2). n , n=2~10.

[0009] Optionally, R2 is .

[0010] Alternatively, R3 is (CH2). n , n=2~10.

[0011] Alternatively, R4 is (CH2). n , n=2~10.

[0012] This invention also proposes a method for preparing the above-mentioned oil-water universal nano-organic clay, the preparation method comprising the following steps: S10. Mix montmorillonite, hydrotalcite and water, stir, centrifuge and purify to obtain a suspension; S20. Add a pH adjuster to the suspension to adjust the pH of the suspension to 6-8, and stir at 30-40°C for 1-2 hours; S30. Continue adding the polyhydroxy quaternary ammonium salt and stir at 60-90℃ for 2-5 hours; S40. Continue to add the pH adjuster to adjust the pH of the slurry to 7-8, and stir at 30-40℃ for 1-2 hours to obtain a dispersion; S50. The dispersion is filtered, washed, dried, and pulverized to obtain an oil-water universal nano-organic clay.

[0013] Optionally, in step S10, the weight ratio of montmorillonite and hydrotalcite to water is 5-10%.

[0014] Optionally, in steps S20 and S40, the pH adjuster is one or more of sulfuric acid, hydrochloric acid, triethanolamine, and sodium hydroxide.

[0015] Optionally, the step S50 is characterized in that the drying process adopts freeze drying, and after freeze drying, air jet milling is performed to control the product particle size D95≤50μm.

[0016] In this invention, a polyhydroxy quaternary ammonium salt is used as the core modifier. Utilizing the unique molecular structure of the polyhydroxy quaternary ammonium salt, the quaternary ammonium cation end can be firmly adsorbed onto the negatively charged montmorillonite surface through ion exchange. The multiple hydrophilic hydroxyl groups not only form strong hydrogen bonds with water molecules, giving the clay excellent dispersibility and thickening properties in aqueous systems, but their steric hindrance also prevents excessively dense lamellar packing. The carboxylate anion end partially interacts with the positively charged hydrotalcite, acting as a "bridge" and "synergistic modifier" between the montmorillonite-hydrotalcite complex, transforming two originally incompatible substances into a homogeneous and stable organic complex. In oily systems, the long carbon chains of the polyhydroxy quaternary ammonium salt extend outwards, giving the clay excellent oleophilicity and enabling efficient thickening like traditional organic clays. In aqueous systems, the outward extension of the polyhydroxy groups provides strong hydration and steric hindrance, allowing the clay to disperse and thicken like a high-performance synthetic thickener. This clay, when added in the same amount, exhibits high and stable viscosity and thixotropic index in various media such as white oil, diesel oil, ethanol, water, and water-based emulsions, truly achieving "one agent for multiple uses". Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of an embodiment of the preparation method of the oil-water universal nano-organic clay provided by the present invention.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0021] It should be noted that, unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer should be followed. Reagents or instruments whose manufacturers are not specified are all commercially available products. Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention. Based on the embodiments of this invention... Examples of embodiments obtained by those skilled in the art without inventive effort are all within the scope of protection of this invention.

[0022] Bentonite is a natural inorganic nanolayered silicate mineral, with montmorillonite as its main mineral component. Montmorillonite sheets consist of two layers of silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedra. The thickness of a single sheet is approximately 0.96 nm, and the sheet width ranges from 50 to 200 nm, making it a natural two-dimensional nanomaterial. The surface of montmorillonite carries a negative charge and possesses cation exchange capacity, enabling it to adsorb metal cations from water or the environment.

[0023] Hydrotalcite materials belong to the anionic layered compound family. Layered compounds refer to a class of compounds with a layered structure, interlayer ions, and exchangeability. Utilizing the intercalation capability of the main layered compound under the influence of strongly polar molecules and the exchangeability of interlayer ions, functional guest substances are introduced into the interlayer voids, widening the gaps between the layers to form a layered compound. Hydrotalcite compounds (LDHs) are a new type of inorganic functional material with a layered structure. The chemical composition of the main layered plates of LDHs is closely related to factors such as the cation characteristics of the plates, the charge density or anion exchange capacity, and the supramolecular intercalation structure. Hydrotalcite, in particular, consists of positively charged metal hydroxide plates and exchangeable anions. Its interlayer anions (such as...) , (e.g., can enter organic solvents through ion exchange, thus enabling them to function as adsorbents in organic solvents.)

[0024] This invention employs a "montmorillonite / hydrotalcite" positive and negative charge composite substrate design, combining naturally negatively charged montmorillonite with naturally positively charged hydrotalcite (LDHs) to construct a "complementary" composite substrate. This simultaneously introduces negatively charged centers (montmorillonite sheets) and positively charged centers (hydrotalcite sheets) at the nanoscale. In aqueous systems, the double-layer effect of these composite particles is enhanced; in oil-based systems, their unique amphiphilicity makes them easier to solubilize and disperse. This provides a fundamental material basis for achieving universal compatibility with both oil and water, effectively overcoming the unipolar limitations of traditional products that are either "oleophilic but not hydrophilic" or "hydrophilic but not oleophilic."

[0025] This invention proposes an oil-water universal nano-organic clay, comprising the following components by weight: 60-80 parts montmorillonite, 30-40 parts hydrotalcite, and 20-40 parts polyhydroxy quaternary ammonium salt, preferably comprising the following components by weight: 70-80 parts montmorillonite, 30-35 parts hydrotalcite, and 20-40 parts polyhydroxy quaternary ammonium salt.

[0026] The structural formula of the polyhydroxy quaternary ammonium salt is as follows: , In the formula, R1 is CH3(CH2). n n=0~29, R2 is C1-C 10 Straight-chain or branched, saturated or unsaturated alkyl, or aromatic hydrocarbon group, where R3 is C1-C. 10 It is a straight-chain or branched, saturated or unsaturated alkyl group, where M is Cl or Br.

[0027] Montmorillonite is selected from one or both of sodium-based montmorillonite and artificial sodium-modified montmorillonite, and hydrotalcite is selected from one or more of Mg / Al hydrotalcite, Zn / Al hydrotalcite, and Mg / Zn / Al hydrotalcite.

[0028] In a preferred embodiment, in the structural formula of the polyhydroxy quaternary ammonium salt, R1 is CH3(CH2). n With n=12~29, in oily systems, the longer carbon chains enable organic clays to be better dispersed in organic solvents.

[0029] In a preferred embodiment, in the structural formula of the polyhydroxy quaternary ammonium salt, R2 is (CH2). n With n=2~10, by extending the distance between the ends of the Gemini quaternary ammonium cations, their adsorption on the surface of montmorillonite sheets becomes more robust.

[0030] In a preferred embodiment, R2 is or The steric hindrance effect of phenyl isolates the montmorillonite and hydrotalcite layers from each other, allowing the carboxylate anion end on the quaternary ammonium cation side of the gemini to better bind to the positively charged hydrotalcite layer surface.

[0031] In a preferred embodiment, R3 is (CH2). n With n=2~10, in an aqueous system, the terminal hydroxyl groups and the remaining carboxylic acid groups can form hydrogen bonds with water, providing strong hydration and steric hindrance, allowing the clay to disperse and thicken like a high-performance synthetic thickener.

[0032] In the technical solution of this invention, a polyhydroxy quaternary ammonium salt is used as the core modifier. Utilizing the unique molecular structure of the polyhydroxy quaternary ammonium salt, the quaternary ammonium cation end can be firmly adsorbed onto the negatively charged montmorillonite surface through ion exchange. The multiple hydrophilic hydroxyl ends can not only form strong hydrogen bonds with water molecules, giving the clay excellent dispersibility and thickening properties in the water system, but their steric hindrance effect can also prevent excessively dense stacking of the lamellae. The remaining cation ends partially interact with the negatively charged hydrotalcite, playing a "bridging" and "synergistic modification" role between the "montmorillonite-hydrotalcite" composite, thus forming a uniform and stable organic composite from two originally incompatible substances.

[0033] In oil-based systems, the long carbon chains of the polyhydroxy quaternary ammonium salt extend outwards, giving the clay excellent oleophilicity and enabling it to thicken efficiently like traditional organic clays. In water-based systems, the polyhydroxy groups extend outwards, providing strong hydration and steric hindrance, allowing the clay to disperse and thicken like a high-performance synthetic thickener. This clay, at the same addition amount, exhibits high and stable viscosity and thixotropic index in various media, including white oil, diesel oil, ethanol, and other organic solvents, as well as water and water-based emulsions, truly achieving "one agent, multiple uses."

[0034] The following is in conjunction with the appendix Figure 1 The steps and specific embodiments of the present invention will be described in further detail below. It should be understood that the following embodiments are merely for explaining the present invention and are not intended to limit the present invention. The polyhydroxy quaternary ammonium salt used in the embodiments was synthesized by the inventors themselves, and its structural formula is as follows, wherein the alkyl groups on both sides are straight chains. The reagents and materials were purchased from the market, including sodium montmorillonite, Mg / Al hydrotalcite, 20 wt% dilute sulfuric acid, and 10 wt% sodium hydroxide solution.

[0035] Example 1: Weigh 500g of montmorillonite, 200g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and maintain the temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 240g of polyhydroxy quaternary ammonium salt, and stir at 75℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T1.

[0036] Example 2: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and maintain the temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1 hour, add 240g of polyhydroxy quaternary ammonium salt, and stir at 75℃ for 3 hours. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at 40℃ for 1.5 hours to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T2.

[0037] Example 3: Weigh 500g of montmorillonite, 300g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and maintain the temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 240g of polyhydroxy quaternary ammonium salt, and stir at 75℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T3.

[0038] Example 4: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and maintain the temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 240g of polyhydroxy quaternary ammonium salt, and stir at 60℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T4.

[0039] Example 5: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and maintain the temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 240g of polyhydroxy quaternary ammonium salt, and stir at 70℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T5.

[0040] Example 6: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and put them into a stirrer to fully disperse them. Then, put them into a centrifuge to purify them and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension into a reactor, heat it to 35℃ and keep it at a constant temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 240g of polyhydroxy quaternary ammonium salt, and stir at a constant temperature of 80℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at a constant temperature of 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T6.

[0041] Example 7: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and maintain the temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1 hour, add 240g of polyhydroxy quaternary ammonium salt, and stir at 90℃ for 3 hours. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at 40℃ for 1.5 hours to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T7.

[0042] Example 8: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and keep it at a constant temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 300g of polyhydroxy quaternary ammonium salt, and stir at a constant temperature of 75℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at a constant temperature of 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T8.

[0043] Example 9: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and keep it at a constant temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1 hour, add 180g of polyhydroxy quaternary ammonium salt, and stir at a constant temperature of 75℃ for 3 hours. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at a constant temperature of 40℃ for 1.5 hours to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T9.

[0044] Example 10: Weigh 500g of montmorillonite, 250g of hydrotalcite, and 10L of deionized water, mix them, and stir thoroughly in a stirrer to disperse them. Then, centrifuge to purify and obtain a suspension of montmorillonite and hydrotalcite. Take 5L of the suspension in a reactor, heat it to 35℃ and keep it at a constant temperature. Add dilute sulfuric acid to adjust the pH of the reaction solution to 7, stir for 1h, add 140g of polyhydroxy quaternary ammonium salt, and stir at a constant temperature of 75℃ for 3h. Add sodium hydroxide solution to adjust the pH of the slurry to 8, and stir at a constant temperature of 40℃ for 1.5h to obtain a dispersion. Cool the dispersion to room temperature, filter, wash, freeze dry, and pulverize to obtain sample T10.

[0045] The samples from Examples 1-10 were dispersed in white oil for rheological viscosity testing. 10g of each of the organoclay samples T1-T10 prepared in Examples 1-10 and 10g of conventional organoclay D1 (a mixture of sodium montmorillonite and long-chain alkyl quaternary ammonium salt in a 2:1 weight ratio) were weighed and dispersed in 100g of white oil. The mixture was stirred at 2000 rpm for 10 minutes, maintaining a constant temperature of approximately 30°C during the stirring process. The resulting gel was then placed in a rotational viscosifier for viscosity testing. The test results are shown in Table 1.

[0046]

[0047] As can be seen from the data in Table 1, the sample in this embodiment is effectively dispersed in organic solvents and has higher thickening properties compared with traditional organic clays.

[0048] The samples from Examples 1-10 were dispersed in water to test their rheological viscosity. 10g of the organoclay samples prepared in Examples 1-10 and 10g of traditional organoclay D2 (sodium montmorillonite) were weighed and dispersed in 200mL of water. The mixture was stirred at 2000rpm for 10min, maintaining a constant temperature of approximately 30℃ during the stirring process. The resulting gel was then placed in a rotational viscosifier to test its viscosity. The test results are shown in Table 2.

[0049]

[0050] As can be seen from the data in Table 2, the sample in this embodiment is effectively dispersed in an aqueous system and has higher thickening properties compared with traditional organic clay.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil-water universal nanoclay, characterized by, The oil-water universal nano organic clay comprises the following components in parts by weight: 60-80 parts of montmorillonite, 30-40 parts of hydrotalcite, and 20-40 parts of a polyhydroxy quaternary ammonium salt. The structural formula of the polyhydroxy quaternary ammonium salt is , wherein R1is a linear alkyl group of C1-C 29 4 carbon atoms, R2is a linear or branched, saturated or unsaturated alkyl group, or an aromatic hydrocarbon group, 10 R2is a linear or branched, saturated or unsaturated alkyl group, or an aromatic hydrocarbon group, 10 R2is a linear or branched, saturated or unsaturated alkyl group, or an aromatic R3is a linear or branched, saturated or unsaturated alkyl group of 1 to 6 carbon atoms, 10 linear or branched, saturated or unsaturated alkyl group of 1 to 6 carbon atoms, R4is a linear or branched, saturated or unsaturated alkyl group of 1 to 6 C atoms, 10 R4is a linear or branched, saturated or unsaturated alkyl group of 1 to 6 C atoms, M is Cl or Br.

2. The organoclay of claim 1, wherein the organoclay is a water- swellable organoclay. In the structural formula of the polyhydroxy quaternary ammonium salt, R1 is CH3(CH2) n , n = 12~29.

3. The organoclay of claim 1, wherein the organoclay is a water- swellable organoclay. In the structural formula of the polyhydroxy quaternary ammonium salt, R2 is (CH2) n , n = 2 ~ 10.

4. The organoclay of claim 1, wherein the organoclay has a cation exchange capacity of at least 50 meq / 100 g. R2 is or .

5. The organoclay of claim 1, wherein the organoclay has a cation exchange capacity of at least 50 meq / 100 g. R3 is (CH2) n n = 2-10.

6. The organoclay of claim 1, wherein the organoclay has a cation exchange capacity of at least 50 meq / 100 g. R4 is (CH2) n n = 2-10.

7. A method of preparing the organo-nanoclay of claim 1, wherein, The preparation method comprises the following steps: ​ S10. mixing the montmorillonite, the hydrotalcite and water, stirring and centrifuging to obtain a suspension; S20. adding a pH regulator to the suspension to adjust the pH of the suspension to 6-8, and stirring at 30-40°C for 1-2 hours; S30. continuously adding the polyhydroxy quaternary ammonium salt, and stirring at 60-90°C for 2-5 hours; S40. continuously adding the pH regulator to adjust the pH of the slurry to 7-8, and stirring at 30-40°C for 1-2 hours to obtain a dispersion; S50. filtering, washing, drying and crushing the dispersion to obtain the oil-water universal nano organic clay.

8. The method for preparing the oil-water universal nano-organic clay as described in claim 1, characterized in that, In the step S10, the weight ratio of the montmorillonite and the hydrotalcite to water is 5-10%.

9. The method for preparing the oil-water universal nano-organic clay as described in claim 1, characterized in that, In the steps S20 and S40, the pH regulator is one or more of sulfuric acid, hydrochloric acid, triethanolamine and sodium hydroxide.

10. The method of claim 3, wherein the organoclay is an organo- montmorillonite clay. In the step S50, the drying process adopts freeze drying, and after freeze drying, airflow crushing is performed to control the product particle size D95≤50 μm.

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