Pyrolytically produced surface-modified magnesium oxide

Abstract

The present invention relates to a pyrogenically produced surface modified magnesium oxide and its method of manufacture, as well as uses thereof.

Description

[Technical field]

[0001] The present invention relates to a pyrogenically produced surface modified magnesium oxide and a process for its production and uses. [Background technology]

[0002] Ceramic oxide particles, especially silica, alumina, titania and zirconia, are known. In various applications, the use of high-surface pyrolytic magnesium oxide is advantageous, for example for applications in the field of catalysis (see, for example, S. Demirci et al., Materials Science in Semiconductor Processing 34 (2015), pp. 154-161).

[0003] For some applications, it is necessary to treat the surface of hydrophilic magnesium oxide to create a hydrophobic rather than hydrophilic surface: on the one hand, the functionalization of the hydrophobic surface prevents magnesium oxide from reacting with moisture in the air, but on the other hand, the hydrophobic surface is important for compatibility in organic systems.

[0004] So far, surface treatment of high surface pyrolytic magnesium oxide has only been described with methyl silica sol (e.g., NRDhineshbabu et al., "Hydrophobic, flame retardant, and antibacterial properties of cotton fabric functionalized with MgO / methyl silicate nanocomposites," RSC Adv. 2014, 4, 32161). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] S. Demirci et al., Materials Science in Semiconductor Processing 34 (2015), pp. 154-161 [Non-Patent Document 2] NRDhineshbabu et al., "Hydrophobic, Flame Retardant, and Antibacterial Properties of Cotton Fabric Functionalized with MgO / Methylsilicate Nanocomposites," RSC Adv. 2014, 4, 32161 Summary of the Invention [Problem to be solved by the invention]

[0006] The variability of such surface treatments is very limited. It is therefore an object of the present invention to provide a surface modified magnesium oxide with a broad spectrum of surface modifications without altering the intended properties of the magnesium oxide used. Surprisingly, this combination of difficult tasks can be achieved by the present invention. [Means for solving the problem]

[0007] Thus, in a first aspect of the present invention there is provided a pyrogenically produced surface modified magnesium oxide having the following characteristics: Surface area [m 2 / g] (DIN 66 131) is 50 to 350, Tamp density [g / L] (DIN ISO 787 / XI) of 20 to 120, preferably 40 to 120; Loss on drying [%] (DIN ISO 787 II) less than 5, Loss on ignition [%] (DIN 55 921) 0.1 to 20, Carbon content [%] (elemental analysis using LECO C744 instrument) is 0.1-15.

[0008] Therefore, a second object of the present invention is a method for producing a surface-modified pyrogenically produced magnesium oxide, which comprises spraying a surface modifier onto pyrogenically produced hydrophilic magnesium oxide at room temperature, and then heat-treating the mixture at a temperature of 50-300°C, preferably 80-180°C, for 0.5-3 hours.

[0009] An alternative method for surface modification of pyrogenically produced magnesium oxide can be achieved by treating pyrogenically produced hydrophilic magnesium oxide with a vaporous surface modifier, followed by heat treatment of the mixture at a temperature of 50-800°C, preferably 300-600°C, for 0.5-6 hours, preferably 0.5-2 hours.

[0010] The heat treatment can be carried out under a protective gas, for example nitrogen. The surface treatment can be carried out continuously or batchwise in heatable mixers and dryers equipped with spraying devices. Suitable devices are, for example, plowshare mixers or plates, cyclones or fluidized bed dryers.

[0011] The present invention has the advantage that commercially available silanes are used to modify magnesium oxide, allowing the properties of the magnesium oxide to be tailored according to the desired properties and intended purpose.

[0012] Preferably, Surface area [m 2 / g] (DIN 66 131) is 50 to 350, Tamped density [g / L] (DIN ISO 787 / XI) 20-100, Loss on drying [%] (DIN ISO 787 II) less than 5, Loss on ignition [%] (DIN 55 921) 0.1 to 15 A pyrogenically produced hydrophilic magnesium oxide having the formula:

[0013] The term "pyrogenically produced hydrophilic magnesium oxide" as used herein relates to magnesium oxide produced directly by pyrogenic processes, also known as "fumed" processes, or by further modification of pyrogenically produced precursors. The terms "pyrogenically produced", "pyrogenic" and "fumed" are used synonymously in the present context. Fumed magnesium oxide may be produced by flame hydrolysis or flame oxidation, which involves the oxidation or hydrolysis of hydrolyzable or oxidizable starting materials, typically in a hydrogen / oxygen flame. Starting materials typically used for pyrogenic processes include organic or inorganic materials such as metal chlorides.

[0014] Thus, the hydrophilic magnesium oxide according to the present invention can be prepared by subjecting at least one metal precursor solution comprising a magnesium salt, a solvent such as ethanol, methanol or water, to flame spray pyrolysis.

[0015] In the flame spray pyrolysis process, a solution of metal compounds (metal precursors), usually in the form of fine droplets, is introduced into a flame formed by ignition of a fuel gas and an oxygen-containing gas. The metal precursors used are oxidized and / or hydrolyzed to produce the corresponding magnesium oxide.

[0016] In this reaction, highly dispersed, roughly spherical primary particles are formed first, which in the further course of the reaction aggregate to form agglomerates, which then accumulate as weak agglomerates, which can usually be relatively easily separated into strong agglomerates by the introduction of energy, but the strong agglomerates cannot be further broken down without the intensive introduction of energy. The resulting highly agglomerated compound is sometimes referred to as "fumed" or "pyrogenically produced" magnesium oxide. Flame spray pyrolysis processes are generally described in WO 2015 / 173114 and elsewhere.

[0017] The flame spray pyrolysis method preferably comprises the steps of: a) atomizing a metal precursor solution with a nebulizing gas to obtain an aerosol; b) reacting the aerosol in a reaction space of a reactor with a flame obtained by ignition of a mixture of a fuel gas and an oxygen-containing gas to obtain a reaction stream; c) cooling the reaction stream; and d) thereafter removing the solid magnesium oxide from the reaction stream. Includes.

[0018] The metal precursors used in this method include magnesium salts such as magnesium chloride, magnesium nitrate, or magnesium acetate. The solvent for this solution may be any common solvent such as water, ethanol, or methanol. The amount of metal precursor in the solution may range from 5 to 80% by weight, preferably from 20 to 70% by weight, based on the total weight of the solution.

[0019] Examples of fuel gases are hydrogen, methane, ethane, natural gas, and / or carbon monoxide. It is particularly preferred to use hydrogen.

[0020] The oxygen-containing gas is generally air or oxygen-enriched air. The oxygen-containing gas is particularly used in embodiments, for example, where a high BET surface area of ​​the magnesium oxide to be produced is desired. The total amount of oxygen is generally selected to be at least sufficient for complete conversion of the fuel gas and metal precursor.

[0021] To obtain an aerosol, the vaporized solution containing the metal precursors can be mixed with a spray gas, such as nitrogen, air, and / or other gases. The average droplet size of the fine droplets of the resulting aerosol is preferably 1-120 μm, particularly preferably 30-100 μm. The droplets are usually produced using single or multi-material nozzles. The solution may be heated to increase the solubility of the metal precursors and to obtain a suitable viscosity for spraying the solution.

[0022] The particle size of the magnesium oxide can be varied by reaction conditions such as, for example, the temperature of the flame, the proportion of hydrogen or oxygen, the amount of magnesium salt, the residence time in the flame, or the length of the coagulation zone.

[0023] By the above method, the BET specific surface area is 50 to 350 m 2 / g, preferably 150 to 300m 2 A high surface area, pyrogenically produced hydrophilic magnesium oxide with a surface area of ​​100 nm / g is obtained. The material itself is advantageous in terms of its well-balanced properties, allowing for a wide range of uses for the material, and in addition, it provides an advantageous base for providing the surface-modified magnesium oxide of the present invention.

[0024] As surface modifiers the following compounds and mixtures of the following compounds can be used: a) (RO) 3 Si(C n H 2n+1 ) and (RO) 3 Si(C n H 2n-1 ) type organosilanes, where R is alkyl, for example methyl, ethyl, n-propyl, i-propyl, butyl, etc., and n is 1-20. b) R' x (RO) y Si(C n H 2n+1 ) and R' x (RO) y Si(C n H 2n-1 Organosilanes of the type: wherein R is alkyl, e.g., methyl-, ethyl-, n-propyl-, i-propyl-, butyl-, etc.; R' is alkyl, e.g., methyl, ethyl, n-propyl, i-propyl, butyl, etc.; R' is cycloalkyl, n is 1-20, x+y is 3, x is 1, 2, and y is 1, 2. c) X 3 Si(C n H 2n+1 ) and X 3 Si(C n H 2n-1) type halogen organosilanes, in which X is Cl, Br, and n is 1-20. d) X 2 (R')Si(C n H 2n+1 ) and X 2 (R')Si(C n H 2n-1 ) type halogen organosilanes, where X is Cl, Br, R' is alkyl, for example, methyl, ethyl, n-propyl, i-propyl, butyl, etc., R' is cycloalkyl, and n is 1-20. e) X(R') 2 Si(C n H 2n+1 ) and X(R') 2 Si(C n H 2n-1 ) type halogen organosilanes, where X is Cl, Br, R' is alkyl, for example, methyl, ethyl, n-propyl, i-propyl, butyl, etc., R' is cycloalkyl, and n is 1-20. f) (RO) 3 Si(CH 2 ) m Organosilanes of the type -R', where R is an alkyl, such as methyl, ethyl, propyl, etc., m is 0.1 to 20, and R' is a methyl-, aryl (e.g., -C 6 H 5 , substituted phenyl residue), C 4 F 9 , OCF 2 -CHF-CF 3 , -C 6 F 13 , -O-CF 2 -CHF 2 , -NH 2 , -N 3 , -SCN, -CH=CH 2 , -NH-CH 2 -CH 2 -NH 2 , -N-(CH 2 -CH 2 -NH 2 ) 2 , -OOC(CH 3 )C=CH 2 , -OCH 2-CH(O)CH 2 , -NH-CO-N-CO-(CH 2 ) 5 , -NH-COO-CH 3 , -NH-COO-CH 2 -CH 3 , -NH-(CH 2 ) 3 Si(OR) 3 , -S x -(CH 2 ) 3 Si(OR) 3 , -SH, -NR'R''R''', where R' is alkyl, aryl, R'' is H, alkyl, aryl, and R''' is H, alkyl, aryl, benzyl, C 2 H 4 NR''''R''''', where R'''' is H, alkyl and R''''' is H, alkyl. g) (R'') x (RO) y Si(CH 2 Organosilanes of the type m-R', where R'' is alkyl, x+y is 2, R is cycloalkyl, x is 1.2, y is 1.2, m is 0.1 to 20, and R' is methyl-, aryl (e.g., -C 6 H 5 , substituted phenyl residue), C 4 F 9 , OCF 2 -CHF-CF 3 , -C 6 F 13 , -O-CF 2 -CHF 2 , -NH 2 , -N 3 , -SCN, -CH=CH 2 , -NH-CH 2 -CH 2 -NH 2 , -N-(CH 2 -CH 2 -NH 2 ) 2 , -OOC(CH 3 )C=CH 2 , -OCH 2 -CH(O)CH2 , -NH-CO-N-CO-(CH 2 ) 5 , -NH-COO-CH 3 , -NH-COO-CH 2 -CH 3 , -NH-(CH 2 ) 3 Si(OR) 3 , -S x -(CH 2 ) 3 Si(OR) 3 , -SH, -NR'R''R''', where R' is alkyl, aryl, R'' is H, alkyl, aryl, and R''' is H, alkyl, aryl, benzyl, C 2 H 4 NR''''R''''', where R'''' is H, alkyl and R''''' is H, alkyl. h)X 3 Si(CH 2 )m-R' type halogen organosilanes, where X is Cl, Br, m is 0.1 to 20, and R' is methyl-, aryl (e.g., -C 6 H 5 , substituted phenyl residue), C 4 F 9 , OCF 2 -CHF-CF 3 , -C 6 F 13 , -O-CF 2 -CHF 2 , -NH 2 , -N 3 , -SCN, -CH=CH 2 , -NH-CH 2 -CH 2 -NH 2 , -N-(CH 2 -CH 2 -NH 2 ) 2 , -OOC(CH 3 )C=CH 2 , -OCH 2 -CH(O)CH 2 , -NH-CO-N-CO-(CH 2 ) 5 , -NH-COO-CH3 , -NH-COO-CH 2 -CH 3 , -NH-(CH 2 ) 3 Si(OR) 3 , -S x -(CH 2 ) 3 Si(OR) 3 , -SH. i) Halogenated organosilanes of the type (R)X2Si(CH2)m-R', where X is Cl, Br, R is alkyl, such as methyl, ethyl, propyl, m is 0.1 to 20, and R' is methyl-, aryl (e.g., -C 6 H 5 , substituted phenyl residue), C 4 F 9 , OCF 2 -CHF-CF 3 , -C 6 F 13 , -O-CF 2 -CHF 2 , -NH 2 , -N 3 , -SCN, -CH=CH 2 , -NH-CH 2 -CH 2 -NH 2 , -N-(CH 2 -CH 2 -NH 2 ) 2 , -OOC(CH 3 )C=CH 2 , -OCH 2 -CH(O)CH 2 , -NH-CO-N-CO-(CH 2 ) 5 , -NH-COO-CH 3 , -NH-COO-CH 2 -CH 3 , -NH-(CH 2 ) 3 Si(OR) 3 , -S x -(CH 2 ) 3 Si(OR) 3 , -SH. j) Halogenated organosilanes of the type (R)2X Si(CH2)m-R', where X is Cl, Br, R is alkyl, m is 0.1 to 20, and R' is methyl-, aryl (e.g., -C 6 H 5 , substituted phenyl residue), C 4 F 9 , OCF 2 -CHF-CF 3 , -C 6 F 13 , -O-CF 2 -CHF 2 , -NH 2 , -N 3 , -SCN, -CH=CH 2 , -NH-CH 2 -CH 2 -NH 2 , -N-(CH 2 -CH 2 -NH 2 ) 2 , -OOC(CH 3 )C=CH 2 , -OCH 2 -CH(O)CH 2 , -NH-CO-N-CO-(CH 2 ) 5 , -NH-COO-CH 3 , -NH-COO-CH 2 -CH 3 , -NH-(CH 2 ) 3 Si(OR) 3 , -S x -(CH 2 ) 3 Si(OR) 3 , -SH.

[0025] Preferably, the following silanes are used as surface modifiers, either individually or as a mixture: dimethyldichlorosilane, octyltrimethoxysilane, octyltriethoxysilane, hexamethyldisilazane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, dimethylpolysiloxane, glycidyloxypropyltrimethoxysilane, glycidyloxypropyltriethoxysilane, nanofluorohexyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, tridecafluorooctyltriethoxysilane, aminopropyltriethoxysilane. Particularly preferably, octyltrimethoxysilane and octyltriethoxysilane can be used.

[0026] The resulting surface-modified magnesium oxide has a BET surface area of ​​50–350 m 2 / g, preferably 150 to 300m 2 It shows a high value of / g.

[0027] The surface modified magnesium oxide produced pyrogenically according to the present invention can be used in a wide range of applications, such as industrial applications in electronics, catalysts, paints, and oils, or as anode and / or cathode active material coatings for the production of anodes and cathodes used in lithium ion and sodium ion batteries.

[0028] It is assumed that a person skilled in the art can fully utilize the above description without further explanation. Therefore, the preferred embodiments and examples are for illustrative purposes only and are not limiting in any way. In the following the invention will be explained in more detail by means of examples, alternative embodiments of the invention can be used in a similar manner. [Brief description of the drawings]

[0029] [Figure 1]Figure 1 shows a TEM image of hydrophilic magnesium oxide. The measurement was performed using a Hitachi H-7500 with an accelerating voltage of 100 KV and a resolution of 0.34 nm. [Diagram 2] Figure 2 shows the XRD spectrum of the hydrophilic magnesium oxide obtained in Experimental Example 1. The sample was analyzed with an X-ray diffractometer (X'Pert Pro) manufactured by Malvern Pananlytical. EXAMPLES

[0030] Measurement of physicochemical property data In the present invention, the following measurement methods were used to evaluate the properties of various materials.

[0031] A) BET surface area: The BET surface area was determined according to DIN 66 131 using nitrogen.

[0032] B) Tamped density: Determination of tamp density according to DIN ISO 787 / XI, Tamped density measurement principle: Tamped density (previously called tamp volume) is equal to the quotient of the mass and volume of a powder after tamping in a tamp volumeter under defined conditions. According to DIN ISO 787 / XI, tamp density is expressed in g / cm 3 However, since the tamp density of the oxides is very small, this value is expressed in g / L. Furthermore, the drying and sieving and repeated tamping operations are omitted.

[0033] Tamped density measuring device: Tamp volume meter Volume Cylinder Laboratory scale (readable to 0.01g)

[0034] Carrying out tamp density measurements: Fill 200±10mL of oxide into the volumetric cylinder of the tamp volumeter so that no pores remain and the surface is flat. Measure the mass of the filled sample accurately to 0.01g. Place the volumetric cylinder with the sample into the volumetric cylinder holder of the tamp volumeter and tamp 1250 times. Take one accurate reading of the volume of the oxide after tamping. Evaluation of tamp density measurement

[0035]

number

[0036] C) pH value: The pH value is measured on a 4% aqueous dispersion of the hydrophobic oxide in water:methanol (1:1).

[0037] pH value measurement reagent: Distilled or fully deionized water, pH>5.5 Methanol, PA Buffer pH7.00, pH4.66

[0038] Device for measuring pH value: Laboratory scale, (readable to 0.1g) Glass beaker, 250 mL Magnetic Stirrer Magnetic rod, length 4cm Combined pH electrode pH measuring device Dispenser, 100mL

[0039] Procedure for measuring pH value: The measurements are carried out according to DIN / ISO 787 / IX: Calibration: Before measuring the pH value, the measuring device is calibrated with a buffer solution. If several measurements are made in succession, one calibration is sufficient. 4 g of hydrophilic oxide is mixed with 96 g (96 mL) of water in a 250 mL glass beaker using a dispenser to form a paste. With the pH electrode immersed, the mixture is stirred for 5 minutes on a magnetic stirrer (rpm: approx. 1000 min). -1 ). 4 g of the hydrophobic oxide are stirred with 48 g (61 mL) of methanol in a 250 mL glass beaker to form a paste. The suspension is diluted with 48 g (48 mL) of water and stirred for 5 min on a magnetic stirrer (rpm: approx. 1000 min) with a pH electrode immersed. -1 ). After turning off the stirrer, leave the solution for 1 minute and then read the pH. Express the result to one decimal place.

[0040] D) Loss on drying In contrast to the weighing weight of 10 g as stated in DIN ISO 787 II, a weighing weight of 1 g is used to determine loss on drying. The cover is put back on before cooling. No second drying is done. Approximately 1 g of sample is weighed out accurately to 0.1 mg into a weighing dish with a ground cover dried at 105 °C and, avoiding dust generation, dried for 2 h in a drying cabinet at 105 °C. After cooling in a desiccator with the cover on, the sample is weighed again under the blue gel.

[0041]

number

[0042] Results are reported to one decimal place. E) Ignition loss Device for measuring loss on ignition: Porcelain crucible with crucible cover Muffle Furnace Analytical scale (readable down to 0.1 mg) Desiccator

[0043] How to measure loss on ignition: According to DIN 55 921, 0.3 to 1 g of wet substance is weighed out to the nearest 0.1 mg into a porcelain crucible with a crucible cover. The crucible is preheated to red-hot. Heat in a muffle furnace at 1000 °C for 2 hours. Dust generation is carefully avoided. It has proven effective to place the weighing sample in the muffle furnace while it is still cold. Slow heating of the furnace helps to avoid creating strong air turbulences in the porcelain crucible. After reaching 1000 °C, red-hot heating is continued for a further 2 h. The crucible cover is then fitted and the weight loss of the crucible is measured on a blue gel in a desiccator. Evaluation of loss on ignition measurements Ignition loss is measured based on a sample dried at 105°C for 2 hours, and the following calculation formula can be used:

[0044]

number

[0045] m0=Measurement amount (g) TV=Loss on drying (%) m1 = weight of sample after red-heating (g) Results are reported to one decimal place.

[0046] F) Carbon content The carbon content is measured by elemental analysis using a LECO C744 instrument. The measurement principle is to measure the carbon in the sample by CO 2 which is oxidized to 1,000,000, which is quantified with an infrared detector.

[0047] Preparation of magnesium oxide: Experimental Example 1: Preparation of magnesium oxide by pyrolysis 1000g Mg(CH 3 COO) 2 *4H 2 A 1.89 kg aqueous solution containing O was prepared. This dispersion is 2.5 kg / hour and air is 15 Nm 3Aerosols of 10000 / h were generated with a two-component nozzle and sprayed into a tubular reactor with a combustion flame. The combustion gas of the flame was hydrogen 8Nm 3 / hour and air 30Nm 3 / hour. In addition, 25Nm 3 / h secondary air was used. After the reactor the reaction gas was cooled and filtered. The properties of the particles are shown in Table 1. TEM images of the particles are shown in Figure 1. XRD analysis (Figure 2) showed that the main phase of the product was cubic magnesium oxide.

[0048] The resulting high surface area pyrogenically produced hydrophilic magnesium oxide has the physicochemical property data shown in Table 1.

[0049] Experimental Example 2: Production of surface-modified magnesium oxide 300 g of pyrogenically produced magnesium oxide (Example 1) was placed in a mixer and sprayed with 72 g of octyltrimethoxysilane. After spraying of the silane onto the powder was complete, mixing was continued for an additional 5 minutes. The wet powder was then conditioned in an oven at 130°C for 3 hours.

[0050] The surface modified magnesium oxide produced has the physicochemical property data shown in Table 1.

[0051] Experimental Example 3: Preparation of surface-modified magnesium oxide 300 g of pyrogenically produced magnesium oxide (Example 1) was placed in a mixer and sprayed with 36 g of octyltrimethoxysilane. After spraying of the silane onto the powder was complete, mixing was continued for an additional 5 minutes. The wet powder was then conditioned in an oven at 130°C for 3 hours.

[0052] The hydrophilic surface modified magnesium oxide has the physicochemical property data shown in Table 1. Table 1: Characteristics

[0053] [Table 1]

Claims

1. below: Surface area [m ２ / g] (DIN 66 131) is 50-350, Tamp density [g / L] (DIN ISO 787 / XI) is 20-120. Drying loss [%] (DIN ISO 787 II) is less than 5. Loss on ignition [%] (DIN 55 921) is 0.1 to 20. Surface-modified magnesium oxide produced by pyrolysis, having physical and chemical properties with a carbon content [%] (elemental analysis using LECO C744 instrument) of 0.1 to 15.

2. A method for producing surface-modified magnesium oxide by a thermal decomposition method according to claim 1, comprising spraying a surface modifier onto hydrophilic magnesium oxide produced by a thermal decomposition method at room temperature, and then heat-treating the mixture at a temperature of 50 to 300°C for 0.5 to 3 hours.

3. A method for producing surface-modified magnesium oxide by a thermal decomposition method according to claim 1, comprising spraying a surface modifier in the form of vapor onto hydrophilic magnesium oxide produced by a thermal decomposition method, and then heat-treating the mixture at a temperature of 50 to 800°C for 0.5 to 6 hours.

4. The hydrophilic magnesium oxide is produced by a method of subjecting a solution of at least one metal precursor containing a magnesium salt and a solvent to flame spray pyrolysis, according to claim 2 or 3.

5. The aforementioned flame spray thermal decomposition is as follows: a) A step of atomizing the metal precursor solution with a spray gas to obtain an aerosol, b) A step of reacting the aerosol in the reaction space of a reactor with a flame obtained by igniting a mixture of fuel gas and oxygen-containing gas to obtain a reaction flow, c) A step of cooling the reaction flow, d) The process of removing solid magnesium oxide from the reaction flow. The method according to claim 4, including the method described in claim 4.

6. The hydrophilic magnesium oxide produced by the aforementioned thermal decomposition method is as follows: Surface area [m ２ / g] (DIN 66 131) is 50-350, Tamp density [g / L] (DIN ISO 787 / XI) is 20-100. Drying loss [%] (DIN ISO 787 II) is less than 5. The method according to claim 2, wherein the physicochemical properties include a loss on ignition [%] (DIN 55 921) of 0.1 to 15.

7. The method according to claim 2, wherein the surface modifier is selected individually or as a mixture from dimethyldichlorosilane, octyltrimethoxysilane, octyltriethoxysilane, hexamethyldisilazane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, dimethylpolysiloxane, glycidyloxypropyltrimethoxysilane, glycidyloxypropyltriethoxysilane, nanofluorohexyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, tridecafluorooctyltriethoxysilane, and aminopropyltriethoxysilane.

8. Use of surface-modified magnesium oxide produced by the pyrolysis method described in claim 1 in electronic equipment, catalysts, paints, and oils, or for anode and / or cathode-active material coatings for producing anodes and cathodes used in lithium-ion batteries and sodium-ion batteries.

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