US20050025690A1 - Mesoporous silica particles and production process thereof - Google Patents

Mesoporous silica particles and production process thereof Download PDF

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US20050025690A1
US20050025690A1 US10/901,057 US90105704A US2005025690A1 US 20050025690 A1 US20050025690 A1 US 20050025690A1 US 90105704 A US90105704 A US 90105704A US 2005025690 A1 US2005025690 A1 US 2005025690A1
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mesoporous silica
silica particles
mesopores
surfactant
particles
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Kentaro Fukuda
Kenji Fukunaga
Hiroya Yamashita
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Tokuyama Corp
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Tokuyama Corp
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Priority claimed from JP2003203206A external-priority patent/JP4737922B2/ja
Priority claimed from JP2003324750A external-priority patent/JP4519433B2/ja
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Assigned to TOKUYAMA CORPORATION reassignment TOKUYAMA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKUDA, KENTARO, FUKUNAGA, KENJI, YAMASHITA, HIROYA
Publication of US20050025690A1 publication Critical patent/US20050025690A1/en
Priority to US12/191,591 priority Critical patent/US7959728B2/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
    • C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates

Definitions

  • the present invention relates to mesoporous silica and a production process thereof. More specifically, it relates to mesoporous silica particles having a particle diameter in a submicron order and useful as a catalyst support, separating agent, adsorbent, low-dielectric film or ink absorbent for ink jet recording paper and to a process for producing the above particles efficiently at a high yield.
  • Mesoporous silica is a new material having pores with a diameter of 2 to 50 nm (to be referred to as “mesopores” hereinafter) and expected to be used in various fields such as catalyst support and separating agents. Like other inorganic materials, it is preferably in the form of fine particles in most cases when it is actually used.
  • mesoporous silica when it is used as thin film like an ink absorbent for ink jet recording paper or low-dielectric thin film, to obtain a flat homogeneous film, mesoporous silica must be particulate and submicron-sized mesoporous silica particles are needed.
  • mesoporous silica is granulated, molded or dispersed uniformly in a matrix. To improve the mechanical strength of a granulated or molded product or dispersibility in the matrix, mesoporous silica must be particulate.
  • mesoporous silica must be particulate.
  • mesoporous silica is pulverized into fine particles, mesopores that are the greatest feature of mesoporous silica collapse, resulting in a greatly reduced value as a material.
  • mesoporous silica is pulverized into submicron-sized fine particles, the collapse of mesopores is marked and the volume of mesopores in mesoporous silica greatly decreases.
  • JP-A 2002-356621 a process for obtaining particulate mesoporous silica by processing a mixed solution of mesoporous silica and a cationic resin dissolved in an aqueous solvent with a high-pressure homogenizer (JP-A 2002-356621) (the term “JP-A” as used herein means an “unexamined published Japanese patent application”).
  • mesoporous silica produced by the above process contains the cationic resin for the prevention of the collapse of its mesoporous structure, its application is limited and there is a problem with uniformity in mesopore size due to a wide mesopore distribution. Therefore, it is difficult to use it as a catalyst support or separating agent which is used for a specific-sized substance.
  • mesoporous silica in order to prevent the collapse of mesopores, mesoporous silica can be pulverized into particles of a size only about 10 ⁇ m. When it is pulverized into submicron-sized fine particles, the volume of mesopores in mesoporous silica greatly decreases.
  • the above objects and advantages of the present invention are attained by a process for producing pulverized mesoporous silica particles, comprising wet pulverizing mesoporous silica particles while a surfactant exists in mesopores.
  • mesoporous silica particles having an average particle diameter of 1 ⁇ m or less, wherein the volume of mesopores having a diameter of 2 to 50 nm is 0.7 mL/g or more, and the geometric standard deviation of a mesopore distribution is 2.0 or less.
  • the above objects and advantages of the present invention are attained by a dispersion containing the above mesoporous silica particles of the present invention and a granulated product obtained by granulating the above mesoporous silica particles of the present invention.
  • FIG. 1 is a graph showing the mesopore distribution curves of mesoporous silica particles obtained in Example 1, Comparative Example 1 and Comparative Example 2.
  • the mesoporous silica particles of the present invention are obtained by using an aggregate of a surfactant as template for mesopores when silica is formed.
  • the mesoporous structure of the mesoporous silica particles is not particularly limited and is, for example, a mesoporous structure that tubular mesopores are arranged in a honeycomb-like form or a 3-D net-like mesoporous structure that spherical mesopores are arranged regularly and communicate with one another, depending on the type of the surfactant and others.
  • the mesopore diameter of the mesoporous silica particles is not particularly limited and may be selected according to application purpose.
  • the mesopore diameter of the mesoporous silica particles can be controlled according to the type of the surfactant and others.
  • the silica source and the surfactant are first mixed together in a polar solvent.
  • an appropriate amount of an acid or alkali is preferably added.
  • Examples of the above polar solvent include water, organic solvents such as alcohols including methanol, ethanol and isopropanol, ethers and ketones, and mixed solvents thereof. Out of these, it is the most preferred to use water alone from the viewpoint of handling ease.
  • silica source examples include particulate silica such as fumed silica, precipitated silica and colloidal silica, alkali metal silicates and silicon alkoxides.
  • alkali metal silicates and active silica sols obtained by dealkalizing these alkali metal silicates are the most preferred because mesoporous silica can be obtained under mild reaction conditions and they are inexpensive.
  • the above surfactant is a compound which forms a micellar or lamellar aggregate and may be a cationic, anionic or nonionic surfactant or polymer having surface activity.
  • a surfactant capable of forming a micelle is selected according to the above polar solvent.
  • the surfactant include alkyltrimethylammonium and polyoxyethylene alkyl ethers having a linear alkyl group having 8 to 20 carbon atoms, and block copolymer of ethylene glycol and propylene glycol.
  • polyoxyethylene alkyl ethers having a linear alkyl group having 8 to 20 carbon atoms and block copolymer of ethylene glycol and propylene glycol are preferred because they are inexpensive and have low toxicity and biodegradability.
  • the amount of the above surfactant is not particularly limited but preferably 50 to 200 parts by weight based on 100 parts by weight of the silica source in terms of SiO 2 .
  • a hydrophobic compound such as 1,3,5-trimethylbenzene or 1,3,5-tributylbenzene may further be added.
  • reaction conditions are not particularly limited and reaction conditions suitable for a reaction system can be selected.
  • particulate silica when used as the above silica source, it is preferably reacted in an alkaline reaction solution at 100 to 150° C. under pressure.
  • an alkali metal silicate or silicon alkoxide when used as the silica source, it is preferably reacted in an alkaline or acid solution at 20 to 100° C. under atmospheric pressure.
  • mesoporous silica particles produced by the above process are wet pulverized while the surfactant is existent in mesopores.
  • mesoporous silica particles obtained by the above production process are pulverized after the surfactant is substantially removed from the particles. According to the processes, when the mesoporous silica particles are pulverized into submicron-sized fine particles, mesopores collapse and the characteristic properties of mesoporous silica greatly deteriorate unless a special pulverizing technique is used.
  • mesoporous silica particles are wet pulverized while a surfactant exists in mesopores, even when mesoporous silica particles are pulverized into submicron-sized fine particles with an ordinary pulverizer, mesopores rarely collapse and the specific surface area and the volume of mesopores can be maintained.
  • Characteristic mesopores are formed in the mesoporous silica particles by the function of the surfactant when the silica source precipitates as silica. Therefore, it is presumed that when the surfactant exists during the above wet pulverizing, even if hydrolysis and precipitation are repeated many times, the characteristic mesopores are retained by the function of the surfactant.
  • surfactant can be added to the mesoporous silica particles produced by the process of the prior art.
  • the surfactant used as a template for the mesopores of the mesoporous silica particles should remain in the mesopores and not be removed from the mesopores.
  • the amount of the surfactant which exists during wet pulverizing is preferably 20 to 300 parts by weight, particularly preferably 50 to 200 parts by weight based on 100 parts by weight of the mesoporous silica particles.
  • the amount of the surfactant is 20 parts or more by weight, the collapse of mesopores can be effectively suppressed.
  • the amount is 300 parts or less by weight, cost required for the surfactant can be reduced and the surfactant can be easily removed after pulverizing.
  • Examples of the dispersion medium used for wet pulverizing in the present invention include water, organic solvents such as alcohols including methanol, ethanol and isopropanol, ethers and ketones, and mixed solvents thereof. Out of these, it is the most preferred to use water alone from the viewpoint of handling ease.
  • the pH of the solution to be processed by wet pulverizing while the surfactant exists in mesopores is adjusted to a range of pH at which mesoporous silica particles formed from silica source ⁇ 2.
  • the collapse of mesopores by wet pulverizing can be particularly effectively suppressed by controlling the pH. Even when the mesoporous silica particles are wet pulverized into submicron-sized particles, the retainability of mesopores (volume of mesopores after wet pulverizing/volume of mesopores before wet pulverizing) can be adjusted to 90% or more.
  • the surfactant and the silica source are reacted with each other in an aqueous solvent to obtain mesoporous silica particles containing the surfactant, and then the mesoporous silica particles are wet pulverized by using part or all of the reaction solution as a dispersion medium.
  • the amount of the surfactant and pH at the time of wet pulverizing can be adjusted without taking special means and a series of production steps can be greatly simplified.
  • a process for producing pulverized mesoporous silica particles comprising a reaction step for forming mesoporous silica particles in a polar solvent by precipitating silica in the presence of a surfactant, a pulverizing step for wet pulverizing the mesoporous silica particles contained in a reaction solution obtained in the above reaction step as the solution to be processed, and a removing step for removing at least part of the surfactant existent in the mesopores of the mesoporous silica particles.
  • aging at normal temperature or under heating may be carried out after wet pulverizing.
  • wet pulverizing method is not particularly limited and any known method may be employed.
  • wet pulverizing with a wet medium type dispersion device such as a bead mill or pot mill, ultrasonic dispersion device, high-pressure homogenizer or a medium-free dispersion device, such as a colloid mill in which particles are pulverized by passing through the gap (several ⁇ m to several tens of ⁇ m) between a fixed disk and a rotary disk is employed.
  • a wet medium type dispersion device is preferred because it has high pulverizing efficiency and can easily pulverize mesoporous silica into submicron-sized fine particles.
  • the content of the mesoporous silica particles in the solution to be processed by wet pulverizing is preferably 1 to 40 wt %, more preferably 3 to 20 wt %.
  • wet pulverizing efficiency can be improved and when the content is 40 wt % or less, the mesoporous silica particles can be uniformly and easily pulverized into fine particles.
  • the solution to be processed may foam and the pulverizing efficiency may lower.
  • it is preferred to take a measure for preventing the inclusion of foam into the solution for example, the elimination of a dead volume in a vessel for pulverizing.
  • the addition of a small amount of an anti-foaming agent is also effective.
  • Preferred examples of the anti-foaming agent include acetylene glycol-based anti-foaming agents and silicone-based anti-foaming agents.
  • the pulverized mesoporous silica particles can be obtained by removing at least part of the surfactant from the pulverized mesoporous silica particles containing the surfactant obtained by the above wet pulverizing.
  • the method of removing the surfactant is not particularly limited, for example, extraction with a suitable solvent, extraction with a supercritical fluid such as carbon dioxide, or calcinations at 400 to 600° C. are mentioned.
  • the surfactant is preferably removed completely but the surfactant residue may be contained in limits that do not impair the characteristic properties of the mesopores of the mesoporous silica particles.
  • the method of extracting the surfactant using an extraction solvent is preferred because the extracted surfactant can be recycled and the re-agglomeration of mesoporous silica particles after wet pulverizing can be easily suppressed.
  • the pulverized mesoporous silica particles containing the surfactant are dispersed into the extraction solvent, stirred at normal temperature or under heating for a specific period of time and subjected to solid-liquid separation.
  • Any extraction solvent may be used if it can extract the surfactant from the pulverized mesoporous silica particles.
  • the extraction solvent include alcohols such as methanol, ethanol and propanol and ketones such as acetone, from which a suitable solvent may be selected.
  • the above solid-liquid separation is not particularly limited but it is preferably carried out by filtration with a filter press, centrifugation with a centrifugal separator or a decanter, or ultrafiltration.
  • impurities other than the surfactant such as an acid, alkali and salt may be contained in the processed solution after wet pulverizing. These impurities may be removed simultaneously with the removal of the surfactant. When it is difficult to remove them simultaneously with the removal of the surfactant, it may be removed by washing separately.
  • mesoporous silica particles having an average particle diameter of 1 ⁇ m or less, a volume of mesopores having a diameter of 2 to 50 nm of 0.7 mL/g or more and a geometric standard deviation of a mesopore distribution of 2.0 or less can be particularly advantageously used in the fields of catalyst supports, separating agents, adsorbents, low-dielectric films and ink absorbents for ink jet recording paper.
  • the mesoporous silica particles provided by the present invention have an average particle diameter of 1 ⁇ m or less.
  • the mesoporous silica particles having the above average particle diameter can form a flat homogeneous film in fields in which a film formed from mesoporous silica particles is used. Since a granulated or molded product obtained from the mesoporous silica particles has high mechanical strength, it is also useful in the fields of catalyst supports, separating agents and adsorbents.
  • mesoporous silica particles having the above average particle diameter mesoporous silica particles having an average particle diameter of 0.5 ⁇ m or less are preferred, and mesoporous silica particles having an average particle diameter of 0.3 ⁇ m or less are particularly preferred.
  • the lower limit of the average particle diameter is not particularly limited but generally 0.01 ⁇ m, preferably 0.03 ⁇ m.
  • the mesoporous silica particles of the present invention are characterized in that the volume of mesopores is 0.7 mL/g or more though they are fine particulate as described above.
  • the porosity of the obtained film grows, thereby making it possible to increase the amount of ink absorbed into ink jet recording paper and to reduce the dielectric constant of a low-dielectric film.
  • Mesoporous silica particles having the above volume of mesopores are excellent in improving the catalytic activity, the separation efficiency, the adsorption capacity and the holding amount of a medicine.
  • mesoporous silica particles having the above volume of mesopores mesoporous silica particles having a mesopore volume of 1.0 mL/g or more are particularly preferred.
  • the upper limit of mesopore volume is not particularly limited but generally 3 mL/g.
  • the mesoporous silica particles of the present invention are also characterized in that the geometric standard deviation of a mesopore distribution (to be referred to as “ ⁇ p ” hereinafter) is 2.0 or less.
  • ⁇ p is an index of uniformity in mesopore diameter. As ⁇ p becomes smaller, the mesopores become more uniform in diameter.
  • mesoporous silica particles having the above ⁇ p are extremely uniform in mesopore diameter, a substance having a specific size can be selectively treated in the fields of catalyst supports, separating agents and adsorbents.
  • mesoporous silica particles having the above ⁇ p mesoporous silica particles having a geometric standard deviation of 1.7 or less are particularly preferred.
  • the lower limit of ⁇ p of the mesoporous silica particles is not particularly limited but generally 1.
  • the mesoporous silica particles of the present invention are preferably amorphous silica particles. That is, crystalline silica often forms a crystalline silica dust in process of making and use, and the crystalline silica dust causes silicosis which is difficult to be cured. Therefore, special attention must be paid to the crystalline silica. In contrast to this, as amorphous silica does not form a crystalline silica dust, it is extremely advantageous in terms of safety.
  • the mesoporous silica particles of the present invention have a geometric standard deviation of a particle size distribution (to be referred to as “ ⁇ d ” hereinafter) of preferably 1 to 3, particularly preferably 1.5 to 2.5.
  • ⁇ d is an index of uniformity in particle diameter. As ⁇ d becomes smaller, the fine particles become more uniform in particle diameter.
  • Mesoporous silica particles having a ⁇ d of 1 or more have a high packing density when they are granulated or molded. This is because the porosity of a packed layer decreases as the particle size distribution becomes wider as described in Kagaku Kogaku Ronbunshuu (Papers on Chemical Engineering), vol. 11, No. 4, pp. 438, 1985. Therefore, when the mesoporous silica particles having ⁇ d of 1 or more are granulated or molded, they tend to become dense, whereby a granulated or molded product having high mechanical strength can be formed with a small amount of a binder. When the mesoporous silica particles are filled into a container and used, the container can be made compact. Since mesoporous silica particle shaving a ⁇ d of more than 3 include coarse particles and extremely fine particles, they may cause a handling problem.
  • the mesoporous silica particles of the present invention preferably have an average mesopore diameter of 5 nm or more. That is, the mesoporous silica particles having an average mesopore diameter of 5 nm or more are useful for not only the above application purposes but also other application purposes because they can adsorb, separate or carry a polymer substance such as protein.
  • the mesoporous silica particles of the present invention preferably have an X-ray diffraction peak corresponding to a d value of 2 to 50 nm. Since the mesoporous silica particles having the above diffraction peak have mesopores uniform in diameter and arranged regularly, they can be used as a functional material for an optical device, electronic device or others. They can also display more stable performance in other application fields.
  • the process for producing the mesoporous silica particles of the present invention is not particularly limited, they can be advantageously produced by the following process.
  • an alkali metal silicate, surfactant and acid are mixed together to precipitate silica
  • mesoporous silica particles are obtained by using a micellar or lamellar aggregate of the molecules of the surfactant as a template, the mesoporous silica particles are wet pulverized, and the surfactant is extracted and removed from the pulverized mesoporous silica particles.
  • the amount of the above surfactant is preferably 100 parts or more by weight based on 100 parts by weight of silica.
  • the amount of the surfactant is 100 parts or more by weight, the volume of mesopores can be increased.
  • Mesoporous silica particles having a small ⁇ p and a uniform mesopore diameter can be obtained.
  • the above surfactant is preferably a block copolymer of ethylene glycol and propylene glycol.
  • this block copolymer mesoporous silica particles having a small ⁇ p and an average mesopore diameter of 5 nm or more can be obtained.
  • ⁇ p tends to become large and it is difficult to obtain mesoporous silica particles having an average mesopore diameter of 5 nm or more.
  • the reaction mixture is preferably maintained at 20 to 40° C. for 0.5 to 10 hours and then at 80 to 100° C. for 5 to 20 hours. According to this process, the mesopores become uniform in diameter and are arranged regularly, thereby making it possible to obtain mesoporous silica particles having an X-ray diffraction peak.
  • the above wet pulverizing is preferably carried out without removing the surfactant used as a template for the mesopores of the mesoporous silica particles. According to this process, mesoporous silica particles can be easily pulverized into fine particles without impairing pore volume and uniformity in the diameter of the mesopores of the mesoporous silica particles.
  • the above wet pulverizing is the most preferably carried out by using part or all of the reaction solution as a dispersion medium.
  • the pulverizer used for the above wet pulverizing is preferably a wet medium type pulverizer such as boad mill or pot mill.
  • the wet medium type pulverizer has high pulverizing efficiency and can pulverize mesoporous silica particles into fine particles having a particle diameter of 1 ⁇ m or less efficiently.
  • the average particle diameter and ⁇ d of the obtained pulverized mesoporous silica particles can be controlled by suitably selecting the particle diameter of beads as a medium and the processing time (residence time in the pulverizing unit of a continuous pulverizer).
  • the mesoporous silica particles containing the surfactant are dispersed in an extraction solvent and stirred under heating for a specific period of time, followed by solid-liquid separation.
  • the extraction solvent is preferably an alcohol such as methanol, ethanol or propanol, and the solid-liquid separation is preferably carried out by centrifugation, ultrafiltration or precision filtration.
  • the mesoporous silica dispersion of the present invention is obtained by dispersing the mesoporous silica particles of the present invention into a dispersion medium.
  • the mesoporous silica dispersion can form a flat homogeneous film and is useful as a coating solution for forming a thin film such as the ink absorbing layer of ink jet recording paper or a low-dielectric film.
  • any dispersion medium of the mesoporous silica dispersion may be used without restriction if it can disperse the mesoporous silica particles.
  • the dispersion medium include water, organic solvents such as alcohols including methanol, ethanol and isopropanol, ethers and ketones, and mixed solvents thereof. Out of these, it is the most preferred to use water alone from the viewpoint of handling ease.
  • the content of the mesoporous silica particles in the mesoporous silica dispersion is not particularly limited but preferably 5 to 50 wt %, particularly preferably 10 to 40 wt %.
  • the content of the mesoporous silica particles in the mesoporous silica dispersion is higher than 50 wt %, the fluidity of the dispersion is apt to be lower and when the content is lower than 5 wt %, it is difficult to obtain a film having a desired thickness and energy cost required for drying after application is apt to become high.
  • a dispersant may be added to the mesoporous silica dispersion of the present invention in order to enhance the dispersion stability of the mesoporous silica particles.
  • dispersant examples include cationic, anionic and nonionic resins and surfactants.
  • cationic resins having a primary, secondary or tertiary amine or quaternary ammonium salt are particularly preferred.
  • the fixability of an anionic dye contained in ink for ink jet printing can be improved by the function of the cationic resin and ink jet recording paper which is excellent in water resistance and printing density can be obtained.
  • the mesoporous silica granulated product of the present invention can be obtained by granulating the mesoporous silica particles of the present invention.
  • Mesoporous silica particles having a large particle diameter of the prior art have pores all of which are mesopores and it is difficult for a certain substance to diffuse into a mesopore and reach the inside of a particle. Therefore, the inside of each particle cannot be effectively used.
  • the mesoporous silica granulated product of the present invention has macropores between fine particles, a substance diffuses into the macropores and easily reaches the inside of each particle. Therefore, the inside of the mesoporous silica granulated product can be effectively used, whereby it is useful as a catalyst support, separating agent, adsorbent or medical carrier for medicines.
  • the mesoporous silica particles can be granulated to a size of several ⁇ m to several tens of mm according to application purpose. Compared with a case where the mesoporous silica particles are used as they are, the mesoporous silica granulated product is extremely advantageous in handling ease when it is separated or collected.
  • the method of obtaining the above mesoporous silica granulated product is not particularly limited and any known method can be employed without restriction. Specifically, spray granulation for granulating a dispersion of mesoporous silica particles by spraying and drying, rolling granulation for powdery mesoporous silica particles, fluidized bed granulation, stirring granulation, compression granulation or extrusion granulation may be employed.
  • a binder may be added during granulation.
  • Preferred examples of the binder include gelatin, polyvinyl pyrrolidone, polyvinyl alcohol, cellulose and derivatives thereof.
  • the physical properties of the mesoporous silica particles were measured by the following methods.
  • a nitrogen adsorption isotherm at 75K of fully dried mesoporous silica particles was taken by using a high-speed specific surface area/pore distribution measuring instrument (ASAP2010 of Micromeritics Co., Ltd.), and from the isotherm, specific surface area and mesopore distribution was calculated by BET method and BJH method respectively.
  • the mesopore diameter axis of the mesopore distribution curve was a logarithmic scale.
  • the volume, retainability, average diameter (av p ) and ⁇ p of mesopores having a diameter of 2 to 50 nm were calculated from the above mesopore distribution curve.
  • av p and ⁇ p of the mesopores the following equations (1), (2) and (3) were used, respectively.
  • i denotes an i-th section when the mesopore diameter axis is divided into an N number of sections, with the proviso that 1 to N are natural numbers.
  • v i denotes the volume of mesopores having a diameter in the i-th section and p i is a geometric mean between the lower limit and the upper limit of mesopore diameter in the i-th section.
  • Mesoporous silica particles were dispersed in ion exchange water to a concentration of 3 wt % and processed with an ultrasonic dispersion device (UT-205 of Sharp Co., Ltd.) at 200 W for 5. minutes to prepare a sample.
  • the volume-based particle size distribution of the sample was measured with a laser diffraction particle size analyzer (Coulter LS-230 of Coulter Co., Ltd.) at a dispersion medium (water) refractive index as 1.332 and a silica refractive index as 1.458.
  • the particle diameter axis of the particle size distribution curve was a logarithmic scale.
  • i denotes an i-th section when the mesopore diameter axis is divided into an N number of sections, with the proviso that 1 to N are natural numbers.
  • v i denotes the volume of particles having a diameter in the i-th section and d i is a geometric mean between the lower limit and the upper limit of particle diameter in the i-th section.
  • Mesoporous silica particles were dispersed in ion exchange water to a concentration of 0.1 wt % and processed with an ultrasonic dispersion device for 5 minutes to prepare a sample. The sample was dropped to a grid and dried at room temperature under reduced pressure. The mesoporous silica particles on the grid were observed through a transmission electron microscope to evaluate the mesoporous structure of the particles.
  • Mesoporous silica particles powders were filled into a measurement holder and measured at a CuK ⁇ -ray with an X-ray diffraction device (RINT-1400 of Rigaku Denki Co., Ltd.).
  • a block copolymer of ethylene glycol and propylene glycol (Pluronic-P123 of BASF Co., Ltd.) was dissolved in ion exchange water to prepare a 20 wt % surfactant solution.
  • 150 g of the surfactant solution, 44 g of 25 wt % sulfuric acid and 73 g of ion exchange water were mixed together to prepare a transparent solution.
  • 133 g of sodium silicate (containing 15 wt % of SiO 2 and 5.1 wt % of Na 2 O) was added dropwise to this solution under stirring to obtain a cloudy reaction mixture.
  • the pH of the reaction mixture was 2.7.
  • the reaction mixture was maintained at 30° C. for 1 hour under stirring, heated at 95° C. and maintained at that temperature for 12 hours to produce mesoporous silica particles having the surfactant existent in mesopores.
  • a polyethylene pot was filled with 390 g of the above reaction mixture and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the mixture with a pot mill.
  • the amount of the surfactant existent in the mesopores was 150 parts by weight based on 100 parts by weight of silica, the pH of the solution to be processed was 2.8, and the content of the mesoporous silica particles in the solution was 5 wt %.
  • the mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant, and the particles were dried to obtain mesoporous silica particles of the present invention.
  • mesoporous silica particles had a regular mesoporous structure. Since only a broad halo was seen and no peak derived from crystalline silica was seen on a high angle region, it was confirmed that the mesoporous silica particles were amorphous.
  • the physical properties of the mesoporous silica particles are shown in Table 1 and the mesopore distribution curve is shown in FIG. 1 .
  • a block copolymer of ethylene glycol and propylene glycol (Pluronic-P123 of BASF Co., Ltd.) was dissolved in ion exchange water to prepare a 20 wt % surfactant solution.
  • 150 g of the surfactant solution, 44 g of 25 wt % sulfuric acid and 73 g of ion exchange water were mixed together to prepare a transparent solution.
  • 133 g of sodium silicate (containing 15 wt % of SiO 2 and 5.1 wt % of Na 2 O) was added dropwise to this solution under stirring to obtain a cloudy reaction mixture.
  • the pH of the reaction mixture was 2.7.
  • the reaction mixture was maintained at 30° C. for 1 hour under stirring, heated at 95° C. and maintained at that temperature for 12 hours to produce mesoporous silica particles having the surfactant existent in mesopores.
  • mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant so as to obtain mesoporous silica particles as Comparative Example 1.
  • the mesoporous silica particles were dispersed in ion exchange water to prepare a dispersion containing 5 wt % of mesoporous silica particles.
  • a polyethylene pot was filled with 390 g of the above dispersion and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the dispersion with a pot mill.
  • the amount of the surfactant existent in the mesopores was 8 parts by weight based on 100 parts by weight of silica, and the pH of the processed solution was 5.6.
  • a precipitate was collected from the processed solution by centrifugation after wet pulverizing to obtain mesoporous silica particles as Comparative Example 2.
  • a block copolymer of ethylene glycol and propylene glycol (Pluronic-F127 of BASF Co., Ltd.) was dissolved in ion exchange water to prepare a 10 wt % surfactant solution.
  • 210 g of the surfactant solution, 59 g of 25 wt % sulfuric acid and 291 g of ion exchange water were mixed together to prepare a transparent solution.
  • 140 g of sodium silicate (containing 15 wt % of SiO 2 and 5.1 wt % of Na 2 O) was added dropwise to this solution under stirring to obtain a cloudy reaction mixture.
  • the pH of the reaction mixture was 1.0.
  • the reaction mixture was maintained at 30° C. for 10 hours under stirring, heated at 80° C. and maintained at that temperature for 12 hours to produce mesoporous silica particles having the surfactant existent in mesopores.
  • a polyethylene pot was filled with 390 g of the above reaction mixture containing 5 wt % of the mesoporous silica particles and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the mixture with a pot mill.
  • the amount of the surfactant existent in the mesopores was 100 parts by weight based on 100 parts by weight of silica, and the pH of the processed solution was 1.1.
  • the mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant, and the particles were dried to obtain mesoporous silica particles of the present invention.
  • mesoporous silica particles had a regular mesoporous structure. Since only a broad halo was seen and no peak derived from crystalline silica was seen on a large angle side, it was confirmed that the mesoporous silica particles were amorphous.
  • a block copolymer of ethylene glycol and propylene glycol (Pluronic-F127 of BASF Co., Ltd.) was dissolved in ion exchange water to prepare a 10 wt % surfactant solution.
  • 210 g of the surfactant solution, 59 g of 25 wt % sulfuric acid and 291 g of ion exchange water were mixed together to prepare a transparent solution.
  • 140 g of sodium silicate (containing 15 wt % of SiO 2 and 5.1 wt % of Na 2 O) was added dropwise to this solution under stirring to obtain a cloudy reaction mixture.
  • the pH of the reaction mixture was 1.0.
  • the reaction mixture was maintained at 30° C. for 10 hours under stirring, heated at 80° C. and maintained at that temperature for 12 hours to produce mesoporous silica particles having the surfactant existent in mesopores.
  • mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant so as to obtain mesoporous silica particles as Comparative Example 3.
  • the mesoporous silica particles were dispersed in ion exchange water to prepare a dispersion containing 5 wt % of the mesoporous silica particles.
  • a polyethylene pot was filled with 390 g of the above dispersion and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the dispersion with a pot mill.
  • the amount of the surfactant existent in the mesopores was 7 parts by weight based on 100 parts by weight of silica, and the pH of the processed solution was 5.6.
  • a precipitate was collected from the processed solution by centrifugation after wet pulverizing to obtain mesoporous silica particles as Comparative Example 4.
  • a block copolymer of ethylene glycol and propylene glycol (Pluronic-P123 of BASF Co., Ltd.) was dissolved in ion exchange water to prepare a 20 wt % surfactant solution.
  • 100 g of the surfactant solution, 44 g of 25 wt % sulfuric acid and 123 g of ion exchange water were mixed together to prepare a transparent solution.
  • 133 g of sodium silicate (containing 15 wt % of SiO 2 and 5.1 wt % of Na 2 O) was added dropwise to this solution under stirring to obtain a cloudy reaction mixture.
  • the pH of the reaction mixture was 2.7.
  • the reaction mixture was maintained at 30° C. for 10 hours under stirring to produce mesoporous silica particles having the surfactant existent in mesopores.
  • a polyethylene pot was filled with 390 g of the above reaction mixture and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the mixture with a pot mill.
  • the amount of the surfactant existent in the mesopores was 100 parts by weight based on 100 parts by weight of silica, the pH of the processed solution was 2.8, and the content of the mesoporous silica particles in the processed solution was 5 wt %.
  • the above processed solution after wet pulverizing was maintained at 80° C. for 12 hours to age the mesoporous silica particles.
  • the mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant, and the-particles were dried to obtain mesoporous silica particles of the present invention.
  • mesoporous silica particles had a regular mesoporous structure. Since only a broad halo was seen and no peak derived from crystalline silica was seen on a large angle side, it was confirmed that the mesoporous silica particles were amorphous.
  • a block copolymer of ethylene glycol and propylene glycol (Pluronic-P123 of BASF Co., Ltd.) was dissolved in ion exchange water to prepare a 20 wt % surfactant solution.
  • 100 g of the surfactant solution, 44 g of 25 wt % sulfuric acid and 123 g of ion exchange water were mixed together to prepare a transparent solution.
  • 133 g of sodium silicate (containing 15 wt % of SiO 2 and 5.1 wt % of Na 2 O) was added dropwise to this solution under stirring to obtain a cloudy reaction mixture.
  • the pH of the reaction mixture was 2.7.
  • the reaction mixture was maintained at 30° C. for 10 hours under stirring, heated at 80° C. and maintained at that temperature for 12 hours to produce mesoporous silica particles having the surfactant existent in mesopores.
  • Ion exchange water was added to the above precipitate obtained by centrifugation and stirred to obtain a dispersion containing 5 wt % of mesoporous silica particles.
  • a polyethylene pot was filled with 390 g of the above dispersion and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the dispersion with a pot mill.
  • the amount of the surfactant existent in the mesopores was 85 parts by weight based on 100 parts by weight of silica, and the pH of the processed solution was 5.8.
  • a precipitate was collected from the processed solution after wet pulverizing by centrifugation.
  • the mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant, and the particles were dried to obtain mesoporous silica particles.
  • mesoporous silica particles had a regular mesoporous structure. Since only a broad halo was seen and no peak derived from crystalline silica was seen on a large angle side, it was confirmed that the mesoporous silica particles were amorphous.
  • An active silica solution was obtained by treating sodium silicate (containing 4.0 wt % of SiO 2 and 1.4 wt % of Na 2 O) with a strong acid cationic exchange resin.
  • This active silica solution was added dropwise to an aqueous solution containing 150 parts by weight of hexadecyltrimethylammonium hydroxide and 200 parts by weight of 1,3,5-trimethylbenzene based on 100 parts by weight of silica under stirring with a propeller mixer. Then, sodium hydroxide was added to adjust the pH of the reaction solution to 8.5. Stirring was continued to carry out a reaction at 80° C. for 3 hours to obtain a cloudy reaction mixture. The pH of the reaction mixture was 8.4.
  • a polyethylene pot was filled with 390 g of the above reaction mixture containing 5 wt % of mesoporous silica particles and 1,520 g of zirconia balls having a diameter of 2 mm and sealed up without a dead volume in the pot to wet pulverize the mixture with a pot mill.
  • the amount of the surfactant existent in the mesopores was 150 parts by weight based on 100 parts by weight of silica, the pH of the processed solution was 8.4, and the content of the mesoporous silica particles in the processed solution was 5 wt %.
  • the mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect particles. Stirring in ethanol and the collection of particles by centrifugation were repeated to remove the surfactant so as to obtain mesoporous silica particles.
  • An active silica solution was obtained by treating sodium silicate (containing 4.0 wt % of SiO 2 and 1.4 wt % of Na 2 O) with a strong acid cationic exchange resin.
  • This active silica solution was added little by little to an aqueous solution containing 150 parts by weight of hexadecyltrimethylammonium hydroxide and 200 parts by weight of 1,3,5-trimethylbenzene based on 100 parts by weight of silica under stirring with a-propeller mixer. Then, sodium hydroxide was added to adjust the pH of the reaction solution to 8.5. Stirring was continued to carry out a reaction at 80° C. for 3 hours to obtain a precipitate which was then filtered and rinsed to obtain mesoporous silica particles having the surfactant existent in mesopores.
  • the mesoporous silica particles were dispersed in ethanol to a concentration of 1 wt %, stirred under heating and centrifuged to collect a precipitate. Stirring in ethanol and the collection of a precipitate by centrifugation were repeated to remove the surfactant.
  • Ion exchange water was added to the mesoporous silica particles obtained in Example 1 to a concentration of 15 wt % and agitated violently to obtain the mesoporous silica particle dispersion of the present invention.
  • the thin film had a glossy surface. When its section was observed through an optical microscope, it was confirmed that it was a flat homogenous film.
  • a thin film was obtained in the same manner as in Example 6 except that the mesoporous silica particles obtained in Comparative Example 1 were used.
  • the thin film had a rough surface. When its section was observed through an optical microscope, it was found that the surface was very rough and coarse particles were contained in the film.
  • a dispersion containing 10 wt % of mesoporous silica particles was prepared by adding ion exchange water to the mesoporous silica particles obtained in Example 1. The dispersion was introduced into a spray dryer and granulated by spraying to obtain the mesoporous silica particle granulated product of the present invention.
  • the granulated product When the obtained mesoporous silica particle granulated product was observed through a scanning electron microscope, the granulated product was composed of agglomerates of fine particles each of which was as large as about 120 ⁇ m. A large number of macropores having a diameter of about 100 to 300 nm derived from the gap between fine particles were existent in the granulated product.
  • Spray granulation was carried out in the same manner as in Example 7 except that the mesoporous silica particles obtained in Comparative Example 1 were used.
  • the obtained granulated product was fragile and got powdered immediately.
  • the powdered granulated product When the powdered granulated product was observed through a scanning electron microscope, it was composed of particles as large as about 10 to 100 ⁇ m each of which was just a mass, and the existence of macropores was not observed.
  • mesoporous silica particles can be pulverized into submicron-sized fine particles while the collapse of mesopores is suppressed.
  • novel mesoporous silica particles having a particle diameter of 1 ⁇ m or less which could not be achieved in the prior art, a satisfactory mesopore volume and uniformity in mesopore diameter.
  • mesoporous silica particles are used as an ink absorbent for ink jet recording paper, they greatly improve the gloss and printing density of the ink jet recording paper, compared with those of the prior art.
  • the mesoporous silica particles of the present invention are useful as a low-dielectric film, catalyst support, separating agent, adsorbent and medical carrier for medicines in addition to the above applications.

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  • Inorganic Chemistry (AREA)
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  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Silicon Compounds (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
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US20090060816A1 (en) * 2003-07-29 2009-03-05 Tokuyama Corporation Mesoporous silica particles and production process thereof
US20090082201A1 (en) * 2005-04-20 2009-03-26 Hideyuki Negishi Mesoporous silica thick-film, process for producing the same, absorption apparatus and adsorbing film
US7520994B2 (en) 2006-07-12 2009-04-21 Xing Dong Method to remove agent from liquid phase
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US8304924B2 (en) 2009-05-29 2012-11-06 Mitsui Chemicals, Inc. Composition for sealing semiconductor, semiconductor device, and process for producing semiconductor device
US20130196848A1 (en) * 2010-05-21 2013-08-01 Grace Gmbh & Co. Kg Porous inorganic oxide particles and methods of making and using the same
US8999052B2 (en) 2009-08-07 2015-04-07 Panasonic Corporation Method for producing fine mesoporous silica particles, fine mesoporous silica particles, liquid dispersion of fine mesoporous silica particles, composition containing fine mesoporous silica particles and molded article containing fine mesoporous silica particles
US9150422B2 (en) 2009-03-12 2015-10-06 Mitsui Chemicals, Inc. Porous metal oxide, method for producing the same, and use of the same
US10239022B2 (en) * 2016-06-02 2019-03-26 C-Crete Technologies, Llc Porous calcium-silicates and method of synthesis
US10525448B2 (en) 2015-07-22 2020-01-07 Basf Corporation High geometric surface area catalysts for vinyl acetate monomer production
CN112320806A (zh) * 2020-10-22 2021-02-05 辽宁科技学院 一种介孔二氧化硅复合体用热解法制备设备
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US11246931B2 (en) 2017-05-19 2022-02-15 Tokuyama Corporation Active pharmaceutical ingredient carrier and production method of the same
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US20090060816A1 (en) * 2003-07-29 2009-03-05 Tokuyama Corporation Mesoporous silica particles and production process thereof
US7959728B2 (en) * 2003-07-29 2011-06-14 Tokuyama Corporation Mesoporous silica particles and production process thereof
US20060079606A1 (en) * 2004-10-08 2006-04-13 Industrial Technology Research Institute Low dielectric constant substrate
US20090082201A1 (en) * 2005-04-20 2009-03-26 Hideyuki Negishi Mesoporous silica thick-film, process for producing the same, absorption apparatus and adsorbing film
US7781369B2 (en) * 2005-04-20 2010-08-24 National Institute Of Advanced Industrial Science And Technology Mesoporous silica thick-film, process for producing the same, adsorption apparatus and adsorbing film
US7520994B2 (en) 2006-07-12 2009-04-21 Xing Dong Method to remove agent from liquid phase
WO2008045948A2 (en) * 2006-10-10 2008-04-17 Steward Environmental Solutions, Llc Adsorbent composition and method of making same
US20080083672A1 (en) * 2006-10-10 2008-04-10 Xing Dong Adsorbent composition and method of making same
WO2008045948A3 (en) * 2006-10-10 2008-07-03 Xing Dong Adsorbent composition and method of making same
US20090234107A1 (en) * 2006-12-04 2009-09-17 Canon Kabushiki Kaisha Protein-immobilized carrier
US7960185B2 (en) * 2006-12-04 2011-06-14 Canon Kabushiki Kaisha Protein-immobilized carrier
US9150422B2 (en) 2009-03-12 2015-10-06 Mitsui Chemicals, Inc. Porous metal oxide, method for producing the same, and use of the same
US8304924B2 (en) 2009-05-29 2012-11-06 Mitsui Chemicals, Inc. Composition for sealing semiconductor, semiconductor device, and process for producing semiconductor device
US8999052B2 (en) 2009-08-07 2015-04-07 Panasonic Corporation Method for producing fine mesoporous silica particles, fine mesoporous silica particles, liquid dispersion of fine mesoporous silica particles, composition containing fine mesoporous silica particles and molded article containing fine mesoporous silica particles
US20130196848A1 (en) * 2010-05-21 2013-08-01 Grace Gmbh & Co. Kg Porous inorganic oxide particles and methods of making and using the same
US10525448B2 (en) 2015-07-22 2020-01-07 Basf Corporation High geometric surface area catalysts for vinyl acetate monomer production
US10864500B2 (en) 2015-07-22 2020-12-15 Basf Corporation High geometric surface area catalysts for vinyl acetate monomer production
US10239022B2 (en) * 2016-06-02 2019-03-26 C-Crete Technologies, Llc Porous calcium-silicates and method of synthesis
US11246931B2 (en) 2017-05-19 2022-02-15 Tokuyama Corporation Active pharmaceutical ingredient carrier and production method of the same
CN112320806A (zh) * 2020-10-22 2021-02-05 辽宁科技学院 一种介孔二氧化硅复合体用热解法制备设备
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