JP5679640B2 - Method for producing inorganic fine particle dispersion and method for producing organic optical element - Google Patents

Description

  The present invention relates to a method for producing an inorganic fine particle dispersion by bead-type dispersion treatment using a bead mill or the like, a method for producing an organic optical element, and a titanium dioxide dispersion.

  Inorganic substances are rich in variations in refractive index and wavelength dispersion as compared with organic substances, but generally have a problem that processing is not easy. On the other hand, organic substances are easy to process. Therefore, conventionally, it has been studied to produce a molded article having specific properties that cannot be achieved by an organic substance alone by atomizing an inorganic substance and mixing it in an organic substance at a low cost. Particularly, in recent years, the environment in which nano-sized fine particles of inorganic substances can be obtained and the measurement technique has been improved, so that utilization of inorganic fine particles for optical elements is expected.

  However, in general, finely divided inorganic substances are easily aggregated, and it has been thought that it is very difficult to disperse once aggregated inorganic particles to primary particles.

  As one method for dispersing inorganic particles in a liquid, a method using a media dispersion processing apparatus is generally known. A media dispersion processing device puts a mixture of inorganic particles and a solvent in a container containing dispersion beads called media, and stirs them to collide the beads with the inorganic particles. Can be dispersed.

  However, it is known that the inorganic particles are more easily re-aggregated as the dispersion progresses and the aggregate of the individual inorganic particles becomes smaller. The newly exposed surface of the inorganic particles dispersed by the collision with the beads becomes an activated highly polar surface. In addition, the surface newly created by pulverization is also an activated highly polar surface. Furthermore, when the aggregate of inorganic particles is reduced, the surface area of the inorganic particles increases, so the interaction force between the inorganic particles or between the inorganic particles and the liquid molecules increases, and as a result, the inorganic fine particles are considered to aggregate. ing.

  As a countermeasure for preventing re-aggregation of inorganic particles, a method using ultrasonic vibration has been proposed. Patent Document 1 discloses a media agitation type pulverizer in which beads and materials are mixed and agitated by an agitator in a pulverization container to pulverize the pulverized material. More specifically, when the particle size of the pulverized inorganic particles is 1 μm or less, pulverization does not proceed due to reaggregation. Therefore, Patent Document 1 discloses that an ultrasonic vibration generator is installed in a pulverization container and ultrasonic vibration is applied to generate cavitation and suppress reaggregation of inorganic particles.

Japanese Utility Model Publication 3-41791

  However, when producing a transparent optical material by dispersing inorganic particles and using a solution, the size of the inorganic particles needs to be about 1/10 or less of the transmission wavelength. That is, the inorganic particles must be of a size that allows light scattering to be ignored. When the light used is visible light, the particle size of the inorganic particles needs to be 100 nm or less, more preferably 30 nm or less.

  It is known that the effect of ultrasonic vibration shown in Patent Document 1 is effective for particles having a particle diameter of 1 μm. However, in the case of inorganic particles having a particle size of 100 nm or less, where the surface area of the machine particles is 100 times or more, the interaction is excessively increased due to the polarity between the inorganic particles due to the increase in the surface area. Therefore, even if ultrasonic vibration is applied as in the method of Patent Document 1, since the interaction is too strong, there is almost no effect of dispersing inorganic particles.

  The object of the present invention has been made in view of such a background art. A solution in which inorganic fine particles having an average primary particle size of 30 nm or less are dispersed in a solvent is manufactured, and light scattering / An object of the present invention is to provide an optical material satisfying the transmission performance.

In order to solve the above problems, the present invention provides a method for producing an inorganic fine particle dispersion in which inorganic fine particles having an average primary particle size of 1 nm to 30 nm are dispersed in a solvent. A mixed solution containing metal alkoxide present in a state where inorganic fine particles of 1 nm to 30 nm are aggregated is supplied to a dispersion container of a dispersion apparatus, and beads having an average particle diameter of 15 μm to 30 μm are used in the dispersion container. and simultaneously stirring and applying an ultrasonic wave following the mixed solution per 100g 10W least 1000W to the dispersion container, a method for producing an inorganic fine particle dispersed solution, which comprises dispersing treatment the inorganic fine particles.

  Moreover, the manufacturing method of the organic optical element made to harden | cure after mixing the above-mentioned inorganic fine particle dispersion solution and organic resin, volatilizing the said solvent is provided.

  The present invention can satisfactorily disperse inorganic fine particles having an average primary particle size of 30 nm or less in a solution, so that it satisfies light scattering / transmission performance and has a specific property that cannot be considered in conventional organic resins. An optical element having properties can be manufactured.

It is the schematic which shows one embodiment of the manufacturing apparatus of the inorganic fine particle dispersion | distribution solution of this invention.

  The method for producing the inorganic fine particle dispersion according to the present invention will be described.

  In the method for producing an inorganic fine particle dispersion according to the present invention, the average particle diameter of 15 μm to 30 μm is present in a mixed solution in which inorganic fine particles having an average primary particle diameter of 1 nm to 30 nm are aggregated in a solvent. The following beads are introduced and stirred. The inorganic fine particles are dispersed by applying ultrasonic waves to the mixed solution simultaneously with stirring. In addition, the mixed solution thus produced becomes an optical material by mixing with an organic resin such as an acrylic resin or a polycarbonate resin. An optical element is made by molding this optical material.

  Here, the difference between the pulverization process using beads having a large particle diameter as described in Patent Document 1 described above and the dispersion process in the present invention will be described. The process of the present invention is referred to herein as a crushing process relative to the crushing process.

  Since the pulverization process described in Patent Document 1 has a large particle size of beads, the kinetic energy acting by collision with inorganic particles is large. Therefore, the dispersion of the inorganic particles proceeds when the agglomeration is dissolved or broken by a large force. In the case of such a pulverization treatment, as described above, the newly exposed surface of the inorganic particles becomes an activated highly polar surface.

  On the other hand, in the crushing process in the present invention, since the particle diameter of the beads is as small as 30 μm or less, the kinetic energy due to the collision with the inorganic particles is small. Therefore, the aggregation of the inorganic particles is solved without breaking. In the case of such pulverization treatment, the area of the newly exposed surface of the inorganic particles having a high polarity can be made relatively small, so that re-aggregation is difficult.

  In the present invention, in order to realize such a crushing treatment, media having an average particle diameter of 15 μm or more and 30 μm or less are used for inorganic fine particles having an average primary particle diameter of 1 nm or more and 30 nm or less.

  By such crushing treatment, the present inventor has realized that a mixed solution in which inorganic fine particles having an average primary particle diameter of 1 nm to 30 nm are dispersed is produced. However, a new problem of increasing the viscosity of the mixed solution thus produced has become apparent. When the viscosity of the mixed solution is increased, handling properties are hindered, for example, handling properties are lowered. When an organic resin is added, the handling properties are further lowered. It is inferred that the increase in viscosity of the mixed solution is caused by the presence of a slightly polar surface exposed by the crushing treatment. Although this surface does not interact so as to cause aggregation between particles, it is considered that it causes the viscosity of the entire mixed solution system to increase due to the interaction with solvent molecules.

  Therefore, as a result of further studies, the present inventor has found that an increase in viscosity of the mixed solution can be suppressed by applying ultrasonic waves to the mixed solution simultaneously with stirring. Application of ultrasonic vibration to the mixed solution containing inorganic fine particles reduces the polarity of the surface of the inorganic fine particles, reduces the interaction between the inorganic fine particles and / or between the inorganic fine particles and the liquid molecules, and suppresses the increase in viscosity. Inferred. In particular, when there is a metal alkoxide on the surface of highly polar inorganic fine particles, the influence becomes remarkable.

(Distributed treatment device)
In the dispersion treatment using the beads in the present invention, a ball mill, a bead mill, a basket mill, or the like can be used, and the media is made of resin, glass, ceramics such as zirconia, or metal such as stainless steel. Can do. Of these, yttrium-stabilized zirconia, zirconia-reinforced alumina, and the like are preferably used because of the low generation of impurities due to friction with beads and dispersers. As for the size of the media, the average particle size is 15 μm or more and 30 μm or less.

(Inorganic fine particles)
The inorganic fine particles used in the present invention must be dispersed to such an extent that the light scattering and transmission performance as an optical element is satisfied. Accordingly, the primary particle diameter of the inorganic fine particles needs to be 1/10 or less of the transmission wavelength, which is generally said not to affect the light scattering and transmission performance, so that the average particle diameter is 1 nm to 30 nm. .

  As the material of the inorganic fine particles, one kind or a plurality of kinds of metals such as aluminum, indium, silicon, zirconia, tin, and titanium, or a compound thereof can be used according to desired characteristics of the optical element. Also, the modification state of the surface of the inorganic fine particles and the aggregation state of the inorganic fine particles can be adjusted according to the desired characteristics of the optical element.

  The content of the inorganic fine particles contained in the mixed solution has a desired optical performance within a range in which a dispersion state sufficient to maintain scattering and transmission performance as an optical element and a viscosity with sufficiently good handling properties in a subsequent process can be maintained. The type and density can be adjusted as required. In this invention, 10 to 30 mass% of a mixed solution is preferable. If it is less than 10% by mass, the desired optical performance cannot be obtained because the concentration is too low, and if it is 30% by mass or more, even if ultrasonic waves are applied to the mixed solution simultaneously with stirring, the effect of suppressing the increase in viscosity is It will be small.

  In general, when the amount of inorganic fine particles added to the liquid increases and / or when the atomization dispersion of the inorganic fine particles is promoted, the interaction between the inorganic fine particles and / or between the inorganic fine particles and the liquid molecules increases, The viscosity of the fine particle dispersion tends to increase. An increase in viscosity reduces moldability, particularly developability when a mold is filled with resin or cast. In addition, in the process of replacing an organic solvent or the like with a resin or coating on a substrate, an increase in viscosity causes a problem that the operability is lowered.

(Solvent / mixed solution)
As the solvent used in the present invention, water, an organic solvent, an organic substance having an unsaturated bond, or the like can be used. Organic solvents include aromatic hydrocarbons such as toluene, benzene and xylene, alcohols such as ethanol and isopropanol, alicyclic hydrocarbons such as cyclohexane, esters such as ethyl acetate and butyl acetate, ketones such as acetone and methyl ethyl ketone Amides such as DMF, DMAc and NMP, aliphatic hydrocarbons such as hexane and octane, ethers such as diethyl ether and butyl carbitol, halogenated hydrocarbons such as dichloromethane and carbon tetrachloride, etc. It is not limited to. The solvent can be selected in consideration of the affinity with the inorganic fine particles to be used, the post-process and the environmental load, and the solvent can be used alone, or two or more types within the range that does not impair the dispersibility. Can also be used in combination.

  The mixed solution may contain a resin, for example, acrylic resin, styrene resin, polycarbonate resin, polyester resin, olefin resin, silicone resin, fluorine resin, norbornene resin, polyamide resin, polyimide resin. Resins, urethane resins, polyether resins, phenol resins, aryl resins, and the like can be used.

  The organic substance having an unsaturated bond is a compound having, for example, a (meth) acrylate group or a vinyl group in the molecule as an unsaturated double bond, such as methyl (meth) acrylate or ethyl (meth). Acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, tertiary butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl ( (Meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, isomyristyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) ) Acrylate, 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 3-methoxybutyl (meth) acrylate, butoxyethyl (meth) ) Acrylate, butanediol mono (meth) acrylate, dipropylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, methoxydipropylene glycol (meth) acrylate, methoxytripropylene glycol (meth) acrylate, ethyl carbitol ( (Meth) acrylate, 2-ethylhexyl carbitol (meth) acrylate, cyclohexyl (meth) acrylate, tertiary butyl cyclohexyl (meta) Acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, 2- (meth) acryloyloxyethyl hexahydrophthalate, tetrahydrofur Furyl (meth) acrylate, (meth) acryloylmorpholine, dimethylaminoethyldicyclopentanyl (meth) acrylate, phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, phenoxytetraethylene glycol ( (Meth) acrylate, phenoxyhexaethylene glycol (meth) acrylate, benzyl (meth) acrylate, 2- (meth) acryloyloxy Ethyl phthalate, 2- (meth) acryloyloxyethyl-2-hydroxyethyl phthalate, 2- (meth) acryloyloxypropyl phthalate, neopentyl glycol benzoate (meth) acrylate, α-naphthyl (meth) acrylate, β-naphthyl (Meth) acrylate, imide acrylate, trifluoroethyl (meth) acrylate, tetrafluoropropyl (meth) acrylate, octafluoropentyl (meth) acrylate, perfluorooctylethyl (meth) acrylate, vinylpyrrolidone, N-vinylcaprolactam, 1 -1 type, or 2 or more types, such as vinyl imidazole, vinyl naphthalene, vinyl carbazole, N-vinyl phthalimide, can be used.

  Further, the mixed solution may contain a metal alkoxide that assists the dispersion of the inorganic substance. For example, metal alkoxides, such as magnesium, aluminum, silicon, titanium, etc. are mentioned. In particular, a group of silicon compounds composed of alkoxysilanes and silazanes can be mentioned, and organic materials such as vinyl, epoxy, styryl, methacryloxy, acryloxy, amino, ureido, chloropropyl, mercapto, sulfide, and isocyanate may be included. The type and concentration of the metal alkoxide can be adjusted according to the desired optical performance within a range where the dispersion state and low viscosity can be maintained so that the scattering / transmission performance as an optical element can be maintained.

  The mixed solution may contain a dispersant, a surfactant, etc. The concentration and type of the mixed solution are within the range where the dispersion state and the low viscosity can be maintained so that the scattering and transmission performance as an optical element can be maintained, and the desired optical performance. It can be adjusted according to the demand of

(Ultrasonic application)
Specifically, in a dispersion treatment step in which beads are introduced and stirred to disperse the inorganic fine particles, ultrasonic waves are applied to the mixed solution simultaneously with stirring. The ultrasonic treatment is to assist the dispersion of the inorganic fine particles by installing an ultrasonic generator in any part of the bead type dispersing device, and is preferably performed in a tank, a supply pipe or a discharge pipe. . The output of the ultrasonic wave preferably has a vibration energy intensity that affects inorganic fine particles and beads, and the intensity varies depending on the mounting position and the material of the apparatus, but 10 to 1000 W per 100 g of the inorganic fine particle mixed solution dispersed at a time. It is preferable to carry out with. The frequency of the ultrasonic wave is not particularly limited as long as it is an ultrasonic region of 20 kHz or higher.

  Moreover, the continuous operation time of the dispersion treatment while applying ultrasonic vibration can be performed for 10 to 2000 minutes per 100 g of the inorganic fine particle solution dispersed at a time regardless of the treatment method such as batch treatment or circulation treatment.

(manufacturing device)
Next, the manufacturing apparatus of the inorganic fine particle dispersion solution of the present invention will be described.

  FIG. 1 is a schematic view of a bead mill apparatus for an inorganic fine particle dispersion solution of the present invention. In FIG. 1, reference numeral 1 denotes a cylindrical dispersion container. A winged stirring shaft 2 is provided inside the dispersion container 1, and a plurality of beads 20 called media are arranged in the gap between the winged stirring shaft 2. Has been.

  The inorganic fine particles contained in the mixed solution 7 supplied to the inside of the dispersion container 1 are crushed by colliding with the beads 20 by rotating the bladed stirring shaft 2. 11 is a separator that separates the mixed solution 7 and the beads 20, and the separated mixed solution is discharged from the dispersion container outlet 12 to the outside of the dispersion container. Reference numeral 4 denotes a discharge path for sending the discharged mixed solution into the tank 3. The tank 3 is filled with the mixed solution, and the mixed solution once sent to the tank 3 is supplied again to the dispersion container 1 from the dispersion container inlet 13 through the supply path 5. A pump 6 circulates the mixed solution between the tank 3, the supply path 5, the dispersion container 1, and the discharge path 4. Reference numeral 8 is a cooling water inlet for supplying cooling water to the dispersion container 1, and 9 is a cooling water outlet for discharging the cooling water from the dispersion container 1. Reference numeral 10 denotes ultrasonic application means for applying ultrasonic waves to the mixed solution 7 in the tank 3.

  In the dispersion container 1, the mixed solution 7 present in a state where inorganic fine particles having an average primary particle size of 30 nm or less are aggregated in a solvent is stirred with beads (media) having an average particle size of 30 μm or less and crushed. .

  In addition, the rotation speed of the winged stirring shaft 2 and the flow rate of the liquid feed pump can be appropriately set based on the size and content of the inorganic fine particles, the size of the beads, and the like. In this apparatus, the rotation speed of the bladed stirring shaft 2 can be set between 1 and 5000 rpm, and the liquid feed pump flow rate can be set between 0.1 and 100 kg / h.

  In FIG. 1, the ultrasonic processing means 10 is disposed only in the tank 3, but the present invention is not limited to this. It is important to apply the ultrasonic wave simultaneously with the stirring, and the arrangement may be applied to any or all of the separation container 1, the discharge pipe 4, the tank 3, and the supply pipe 5. The mixing container circulates between the separation container 1, the discharge pipe 4, the tank 3, and the supply pipe 5. Regardless of the position of the mixing container, the mixing solution can be stirred at the same time, and the crushed inorganic Prevent reaggregation of fine particles.

Example 1
Inorganic beads (TiO2, average particle size of primary particles 15 nm), metal alkoxide (trifluoropropyltrimethoxysilane), and 300 mL of diglyme were introduced into the dispersion container of the bead mill apparatus shown in FIG. The density | concentration of the titanium dioxide particle was adjusted in the ratio of 5 mass%, and the metal alkoxide density | concentration was 10 mass%. At the same time, 400 g of zirconia beads having an average particle diameter of 30 μm were introduced as beads. Thereafter, a bead mill treatment was performed for 1050 minutes under conditions of a stirring shaft speed of 3485 rpm and a pump flow rate of 10 kg / h while applying ultrasonic vibration to the dispersion vessel at a frequency of 35 kHz and an output of 100 W. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

  The evaluation results, viscosity and transmittance, were measured as follows, and the evaluation results were summarized based on the details of the evaluation items and evaluation criteria.

(viscosity)
The viscosities in Table 1 are measured with a 1 ° 34 ′ × R24 rotor attached to a Viscometer TV-20H (product name) manufactured by Tokimec Co., Ltd. and measured in a range corresponding to the resin viscosity. The above was evaluated as x.

(Transmittance)
The viscosity in Table 1 was measured using a spectrophotometer U-4000 manufactured by Hitachi High-Technology Co., Ltd., in which a mixed solution of crushed inorganic fine particles after dispersion treatment was placed in a 1 cm square quartz cell. The transmittance at a wavelength of 600 nm was evaluated as 70% or more as good and less than 70% as defective.

(Example 2 )
It carried out by changing the metal alkoxide of Example 1 to 3-acryloxypropyltrimethoxysilane. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

(Example 3 )
The bead of Example 1 was carried out at an average particle size of 15 μm. Conditions other than the media diameter are the same as in the first embodiment. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

(Example 4 )
Introducing inorganic fine particles (SiO ₂ , average particle size of primary particles 12 nm), metal alkoxide (3-acryloxypropyltrimethoxysilane) and methyl methacrylate 400 mL into a dispersion vessel of a bead mill, the inorganic fine particle concentration is 1% by mass. The metal alkoxide concentration was adjusted to 2% by mass. At the same time, 400 g of zirconia beads having an average particle diameter of 30 μm was introduced as a medium. Thereafter, a bead mill treatment was performed for 540 minutes under the conditions of a stirring shaft speed of 3485 rpm and a pump flow rate of 10 kg / h while applying ultrasonic vibration to the dispersion vessel at a frequency of 35 kHz and an output of 100 W. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

(Example 5 )
A resin (PO-modified neopentyl glycol diacrylate) and a photopolymerization initiator (1-hydroxy-cyclohexyl-phenyl-ketone) were added to the inorganic fine particle dispersion obtained in Example 1. While reducing the pressure from atmospheric pressure to 2 hPs in 24 hours using a rotary evaporator, the diglyme in the dispersion obtained in Example 1 was volatilized and evaporated to obtain an organic optical material. The water bath temperature at that time was 50 ° C., and the distilled diglyme was appropriately removed from the system.

  The inorganic fine particle mixture which is a resin / titanium dioxide dispersion obtained by the above operation was adjusted to have an inorganic concentration (TiO2) of 5% and a photopolymerization initiator of 1.4%. The inorganic fine particle mixture was cast on the center of the glass substrate by placing a 30 μm spacer on two glass substrates (2 mmt) opposed to each other. Then, it developed, making it closely_contact | adhere to a glass substrate, and irradiated and irradiated with the ultraviolet-ray (50 mW / cm <2>, 200 second), and the organic optical element was manufactured. The inorganic material mixed film-like element obtained by curing had transparency to the extent that the light scattering / transmission performance as an optical element was satisfied.

(Comparative Example 1)
The average particle size of the primary particles of the inorganic fine particles of Example 1 was set to 150 nm. Conditions other than the primary particle diameter of the inorganic fine particles are the same as in Example 1. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

(Comparative Example 2)
The average particle size of the primary particles of the inorganic fine particles of Example 1 was 50 nm. Conditions other than the primary particle diameter of the inorganic fine particles are the same as in Example 1. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

(Comparative Example 3)
The media of Example 1 was carried out with an average particle size of 200 μm. Conditions other than the media diameter are the same as in the first embodiment. Table 1 shows the evaluation results of the resulting inorganic fine particle dispersion.

(Comparative Example 4 )
The experiment was conducted except for the application of ultrasonic vibration in Example 1. Conditions other than the ultrasonic vibration are the same as in the first embodiment. The resulting inorganic fine particle mixed solution was highly viscous (gelled), and the viscosity and transmittance could not be evaluated.

(Comparative Example 5 )
The experiment was performed except for the application of ultrasonic vibration in Example 5. Conditions other than the ultrasonic vibration are the same as in Example 5. The resulting inorganic fine particle mixed solution was highly viscous (gelled), and the viscosity and transmittance could not be evaluated.

In Comparative Examples 1, 2, and 3, the inorganic fine particle dispersion solution became cloudy, and at the same time, the transmittance was low or the scattering rate was high. Accordingly, it has been found that the average particle size of primary particles of inorganic fine particles is preferably 30 nm or less, and the average particle size of beads is preferably 15 μm or more and 30 μm or less . Comparative Example 4, 5 or, if not subjected to sonication, know that a high viscosity of the mixed solution is generated, the effectiveness of the ultrasonic wave application is illustrated.

  In the present invention, inorganic fine particles having an average primary particle size of 100 nm or less are well dispersed, dispersed to the extent that light scattering / transmission performance as an optical element is satisfied, and has a viscosity with good handling properties. It can utilize for manufacture of an optical element using a fine particle dispersion solution.

DESCRIPTION OF SYMBOLS 1 Dispersion container 2 Feather stirring shaft 3 Tank 4 Discharge pipe 5 Supply pipe 6 Liquid feed pump 7 Mixed solution of inorganic fine particles 8 Cooling water inlet 9 Cooling water outlet 10 Ultrasonic application means 11 Separator 12 Dispersion container outlet 13 Dispersion container inlet 20 beads

Claims (4)

In the method for producing an inorganic fine particle dispersion solution in which inorganic fine particles having an average primary particle diameter of 1 nm to 30 nm are dispersed in a solvent,
In a solvent, inorganic fine particles having an average primary particle size of 1 nm or more and 30 nm or less are present in an aggregated state, and a mixed solution containing a metal alkoxide is supplied to a dispersion container of a dispersion device,
In the dispersion container, at the same time the average particle size is stirred using a 30μm or less of the beads above 15 [mu] m, by applying ultrasonic waves below the mixed solution per 100g 10W least 1000W to the dispersion container, dispersed the inorganic fine particles A method for producing an inorganic fine particle dispersion solution.   The method for producing an inorganic fine particle dispersion solution according to claim 1, wherein the inorganic fine particles are at least one of a metal or a compound of aluminum, indium, silicon, zirconia, tin, and titanium.   The method for producing an inorganic fine particle dispersion solution according to claim 1 or 2, wherein the metal alkoxide is 3-acryloxypropyltrimethoxysilane or trifluoropropyltrimethoxysilane.   A method for producing an organic optical element, comprising mixing an inorganic fine particle dispersion solution produced by the method according to claim 1 and an organic resin, volatilizing the solvent, and then curing.

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