JP2008095115A - Method for producing resin fine particle, resin fine particle and apparatus for producing resin fine particle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing resin fine particles of a homogeneous particle size used in the fields of chemistry, medicine, electronic material or the like, the resin fine particles, and an apparatus for producing the resin fine particles. <P>SOLUTION: The method for producing the resin fine particles comprises discharging a liquid comprising a polymerizable monomer as a dispersion phase into a continuous phase, splitting the liquid comprising the polymerizalbe monomer by applying mechanical vibration to form a liquid droplet, and polymerizing the liquid droplet in a state without splitting or integrating the liquid droplets, the method comprising measuring the particle size of the formed liquid droplets, and feeding back a discharging condition and/or a mechanical vibration condition of a liquid comprising a polymerizable monomer based on a measurement result of the size of the liquid droplet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a method for producing resin fine particles having a uniform particle diameter used in the fields of chemistry, medicine, electronic materials, and the like, a resin fine particle, and a resin fine particle production apparatus.

Conventionally, a suspension polymerization method is known as a method for producing resin fine particles. This method is a method in which an aqueous medium in which a dispersion stabilizer is dissolved is charged into a reaction vessel equipped with a stirrer, and a polymerizable monomer in which a polymerization initiator is dissolved is charged while stirring and heated to obtain resin fine particles. is there. However, with this method, the particle size distribution of the resin fine particles obtained is wide, and in applications that require uniform particle size, such as column fillers, spacers, toners, and foam raw materials, classification operations such as classification are required. It was very complicated.

On the other hand, in Patent Document 1, a polymerizable monomer stream having laminar flow characteristics is broken into small droplets by applying mechanical vibration, moved to a polymerization tank in a continuous phase, and heated. A method of polymerizing is disclosed. However, in the apparatus described in this method, since there are a plurality of polymerizable monomer openings, it is actually difficult to discharge from each of them at the same flow rate. Droplets that are split at the same mechanical frequency have variations in volume or size. Therefore, in such an apparatus, since the split state cannot be sufficiently grasped, it is difficult to avoid the occurrence of a split failure, and the uniformity of the particle diameter of the final resin fine particles may be impaired. In addition, since this device does not have a mechanism for checking the state of droplet generation or the particle size of the droplet, the production will continue even if the uniformity of the particle size is impaired due to fluctuations in the production conditions, etc. There is a problem that the uniformity of the resin fine particles obtained is poor.
JP-A-57-102905

An object of the present invention is to provide a method for producing resin fine particles having a uniform particle diameter, a resin fine particle, and a resin fine particle producing apparatus used in the fields of chemistry, medicine, electronic materials, and the like.

The present invention discharges a liquid composed of a polymerizable monomer as a dispersed phase in a continuous phase, and forms liquid droplets by splitting the liquid composed of the polymerizable monomer by applying mechanical vibration. A method for producing resin fine particles by polymerizing in a state where the droplets are not split or coalesced, the particle size of the formed droplets being measured, and the result being a liquid comprising the polymerizable monomer The method for producing resin fine particles is fed back to the discharge conditions and / or the mechanical vibration conditions.
The present invention is described in detail below.

In the method for producing resin fine particles of the present invention, a liquid composed of a polymerizable monomer is discharged as a dispersed phase in a continuous phase, and the liquid composed of the polymerizable monomer is split by applying mechanical vibration. This is a method for producing resin fine particles by forming droplets and polymerizing the droplets in a state where the droplets are not split or coalesced.

The continuous phase is not limited to gas and liquid. As said gas, inert gas, such as air, nitrogen, argon, etc. are mentioned, for example. As the liquid, in the case of an oil-in-water system in which the continuous phase is water and the polymerizable monomer is oil, for example, water, a mixed solution of water and a water-soluble organic solvent such as alcohol, and the like can be given. . In the case of a water-in-oil phase system in which the continuous phase is an oil system and the polymerizable monomer is an aqueous system, for example, aliphatic hydrocarbons such as n-hexane and n-octane; halogenation such as carbon tetrachloride Hydrocarbon type; aromatic hydrocarbons such as toluene and xylene are listed.

It is preferable to add a dispersion stabilizer to the continuous phase so that the formed droplets do not break or coalesce. The dispersion stabilizer is not particularly limited. In the case of an oil-in-water system, for example, polyvinyl alcohol; cellulose such as carboxymethyl cellulose and hydroxymethyl cellulose; water-soluble polymer such as starch and gelatin; tricalcium phosphate and the like Examples thereof include hardly water-soluble inorganic salts, and in the case of a water-in-oil system, for example, sodium alkylbenzene sulfonate and the like.
A surfactant for adjusting the surface tension, a specific gravity adjusting agent, and the like may also be added to the continuous phase.

As the dispersed phase, a liquid made of a polymerizable monomer is used. Examples of the polymerizable monomer include, in the case of an oil-in-water system, monovinyl aromatic compounds such as styrene, vinyl naphthalene, and alkyl-substituted styrene; halo-substituted styrenes such as bromostyrene and chlorostyrene; divinylbenzene, divinyl. Polyvinyl aromatic compounds such as toluene, divinylxylene, divinylnaphthalene, trivinylbenzene, divinyldiphenyl ether, divinyldiphenylsulfone; haloolefins or vinyl halides such as vinyl chloride; α such as esters of acrylic acid or methacrylic acid -Esters of β-ethylenically unsaturated carboxylic acids; methyl methacrylate, ethyl acrylate, vinyl acetate and the like. Among these, when used in the field of electronic materials, divinylbenzene, which is a crosslinkable polymerizable monomer capable of obtaining heat resistance, and a mixture of divinylbenzene and a polyfunctional acrylate are preferable. These polymerizable monomers may be used independently and 2 or more types may be used together.

Examples of the polymerizable monomer include, in the case of a water-in-oil system, ethylenically unsaturated carboxamides such as acrylamide, methacrylamide, fumaramide, and ethacrylamide; aminoalkyl esters of unsaturated carboxylic acids; And water-soluble polymerizable monomers such as ethylenically unsaturated carboxylic acids such as acrylic acid and methacrylic acid.

A polymerization initiator may be added to the dispersed phase. As the polymerization initiator, conventionally known ones can be used. In the case of an oil-in-water system, for example, benzoyl peroxide, lauroyl peroxide, methyl ethyl ketone peroxide, potassium persulfate, azobisisobutyronitrile, Examples thereof include azobisvaleronitrile, and in the case of a water-in-oil system, for example, water-soluble polymerization initiators such as persulfate, hydrogen peroxide, and hydroperoxide. Moreover, when making it superpose | polymerize by light, a photoinitiator is used and you may add polymerization adjuvants, such as another chain transfer agent.
In addition, a sensitizer, a viscosity modifier, a solvent, a surfactant for adjusting the surface tension, and the like may be added to the dispersed phase as long as the polymerization is not affected.

In the method for producing resin fine particles of the present invention, a liquid composed of a polymerizable monomer is discharged as the dispersed phase into the continuous phase, and the liquid composed of the polymerizable monomer is disrupted by applying mechanical vibration. Form droplets. For example, when a droplet made of the polymerizable monomer is discharged into the continuous phase under the condition that the liquid drops are laminar from an opening such as a nozzle or an orifice, a liquid column of the polymerizable monomer is formed in the vicinity of the opening. Is formed. When a surface wave is applied to the liquid column by applying mechanical vibration to the liquid column, the liquid column is deformed, constricted, and split from the portion to form a droplet. The state of this droplet formation is shown in FIG. Since a constricted portion is generated according to the frequency of vibration, the volume of one droplet can be calculated from the value obtained by dividing the flow rate per unit time by the frequency.

In the method for producing resin fine particles of the present invention, the liquid consisting of the polymerizable monomer is split into droplets, that is, the moment when the droplets are formed from the polymerizable monomer liquid column, The result is fed back to the discharge condition and / or the mechanical vibration condition of the liquid composed of the polymerizable monomer.

The means for recognizing the state in which the liquid breaks up into droplets is not particularly limited.For example, a camera capable of photographing at a high shutter speed sufficient to capture a high-speed droplet formation state in a stationary state, Alternatively, a method of combining such a camera and strobe illumination is preferable. Further, in order to enlarge a minute droplet to a size that can be visually recognized, it is preferable that the camera is equipped with an enlargement photographing device, and an image captured by the camera is displayed on a display or the like so as to be easily recognized. Is preferred.

As the feedback, for example, it is confirmed whether or not the droplet is normally generated as shown in FIG. 1, and if an abnormality occurs, the generation condition is adjusted depending on the situation, or the generation is stopped in some cases. Say to do. An example of the abnormality is shown in FIG. 2, and as an example of feedback in this case, the amplitude of the mechanical vibration to be applied is increased to cause squeezing and the droplet is adjusted to break up. By performing such feedback, resin fine particles having a uniform particle diameter can be produced.

In the method for producing resin fine particles of the present invention, resin fine particles can be obtained by polymerizing the formed droplets of polymerizable monomer in a state where the droplets are not split or coalesced. Examples of the method for preventing the droplets from coalescing include a method of adding a dispersion stabilizer to the continuous phase. Examples of the method for preventing the droplets from breaking up include a method of gently stirring the continuous phase so that excessive mechanical shearing force is not applied to the droplets. In such a state, the polymerizable monomer is polymerized by heating or irradiating active light.

Also, the resin fine particles having a uniform particle diameter can be obtained by measuring the particle diameter of the formed droplets and feeding back the result to the liquid discharge conditions and / or mechanical vibration conditions comprising the polymerizable monomer. Can be manufactured.

In the continuous phase, a liquid composed of a polymerizable monomer is discharged as a dispersed phase, and a liquid composed of a polymerizable monomer is formed by applying mechanical vibrations to form droplets. A method of producing resin fine particles by polymerizing in a non-bonded state, measuring the particle diameter of the formed droplets, and determining the result of the discharge conditions and / or mechanical vibration of a liquid composed of a polymerizable monomer A method for producing resin fine particles that feed back to conditions is also one aspect of the present invention.

The method for measuring the particle diameter of the droplet is not particularly limited, and examples thereof include a method of measuring an image of a droplet formed in a dispersed phase by taking it into a computer. The droplets measured at that time are not particularly limited as long as they are in a droplet state. Specifically, for example, an image photographed by the above-described camera can be taken into a computer, and the particle diameter of a droplet formed by image analysis software can be measured. The obtained measurement values are processed, values such as average values and standard deviations are obtained, and feedback is performed so as to adjust the particle diameter of the droplets from the results. The feedback is controlled, for example, by sending a control signal from a computer or via a sequencer to a device that applies mechanical vibration or a device that adjusts the discharge of the polymerizable monomer. For example, if the particle size is too large, adjust by increasing the frequency of mechanical vibration or decreasing the discharge amount of the polymerizable monomer, and vice versa if the particle size is too small Adjust with.

According to the method for producing resin fine particles of the present invention, resin fine particles having a very uniform particle diameter can be obtained. Resin fine particles produced by the method for producing resin fine particles of the present invention, wherein the average particle size is 10 to 3000 μm, and 80% or more is contained within a range of ± 10% of the average particle size Moreover, it is one of the present inventions.

Here, the preferable lower limit of the particle diameter of the resin fine particles of the present invention is 10 μm, and the preferable upper limit is 3000 μm, because the resin fine particles having such particle diameters are difficult to produce by suspension polymerization. This is because the method for producing resin fine particles is in a particularly effective range. When the resin fine particles of the present invention are contained in a range of ± 10% of the average particle diameter of less than 80%, the particle diameter becomes non-uniform and a separation step may be required.

The production apparatus for carrying out the method for producing resin fine particles of the present invention includes at least a dispersion container, a jet opening for discharging a liquid composed of a polymerizable monomer into the dispersion medium, and a dispersion medium. It is preferable to have a means for applying mechanical vibration to the liquid composed of the polymerizable monomer ejected inside and a photographing device for photographing the formed droplet.

Such a dispersion container, a jet opening for discharging a liquid composed of a polymerizable monomer into a liquid dispersion medium that is open in the dispersion container, and a liquid composed of a polymerizable monomer ejected into the liquid dispersion medium. A resin fine particle manufacturing apparatus having a means for applying mechanical vibration and a photographing device for photographing a formed droplet is also one aspect of the present invention.

The dispersion container is not particularly limited, but is preferably a transparent container that can withstand heating at about 100 ° C. in consideration of photographing the formation state of the liquid droplets with a CCD camera or the like and the reaction after the liquid droplets are formed. Examples of such a dispersion container include a glass round or cylindrical separable flask container.

The said jet nozzle is opened in the said dispersion | distribution container, and discharges the liquid which consists of a polymerizable monomer in a liquid dispersion medium. The shape of the opening of the jet port is preferably a circle, and the flow path shape of the opening is preferably cylindrical or frustoconical. The material of the jet outlet is preferably a material that is not affected by the components of the dispersed phase and continuous phase and is not chemically affected. Examples thereof include stainless steel and Teflon (registered trademark).

In addition, although the said jet nozzle is not specifically limited, It is preferable that it is one. When a plurality of jet outlets are arranged side by side, the amount of the polymerizable monomer ejected from each jet outlet varies, and the size of the droplets generated by vibration becomes uneven and the droplets overlap. It may be difficult to capture clear images.

The method for discharging the polymerizable monomer from the ejection port is not particularly limited, and examples thereof include a method for feeding liquid by a pump or the like. As the pump, a pump with less pulsation is preferable, and a gear pump whose flow rate is easily controlled by the number of rotations is preferably used. When a plunger pump is used as the pump, it is necessary to use a rectifier together. Alternatively, compressed air may be fed into a monomer container connected to the jet port by piping to extrude the monomer from the container, and a fixed amount may be sent out using a flow rate adjustment valve.

The means for applying the mechanical vibration is not particularly limited. For example, the vibrator is mechanically vibrated by connecting the vibrator to a member that supports the jet outlet; the oscillator that generates an electrical signal having a regular frequency is used. For example, a method of transmitting the reciprocating motion generated by the connected piston to the monomer or the dispersion medium may be used. Among these, a method of vibrating the member that directly supports the jet nozzle is preferable. As a method of generating mechanical vibration, for example, there is a method of generating vibration using a function generator, amplifying this using an amplifier, and supplying the vibration to a vibrator. As the vibrator, a vibrator whose frequency and amplitude can be adjusted by an external signal is preferable.

The photographing apparatus is not particularly limited, and a high-speed shutter or stroboscopic illumination sufficient to capture high-speed droplet formation in a stationary state and a small droplet can be enlarged and displayed in a visible size. A CCD camera equipped with a display capable of being used is preferably used.

Dispersion vessel, jet port that opens into the dispersion vessel and discharges the liquid composed of polymerizable monomer into the liquid dispersion medium, mechanical vibrations into the liquid composed of polymerizable monomer ejected into the liquid dispersion medium An apparatus for producing resin fine particles having a means for providing the liquid crystal and a means for measuring the particle diameter of the formed droplets are also one aspect of the present invention.

The means for measuring the particle size of the droplet is not particularly limited. For example, an image obtained by photographing the droplet formation state by the photographing device is taken into a computer, and the particle size of the droplet is measured by the image processing device. It is preferable to do this.

The apparatus for producing resin fine particles of the present invention preferably further comprises means for adjusting the discharge condition and / or the mechanical vibration condition of the liquid composed of the polymerizable monomer based on the measurement result of the particle diameter of the droplet. The particle diameter of the droplets formed by the vibration of the monomer ejected into the liquid dispersion medium is directly proportional to the amount of the polymerizable monomer ejected, and the frequency at which the polymerizable monomer is vibrated. Since it is inversely proportional, if the particle size of the droplet is too large, an operation to decrease the discharge amount of the polymerizable monomer or increase the frequency, and if the droplet size is too small, The operation of increasing the discharge amount of the mass body or decreasing the frequency is performed manually or automatically to make the particle diameter of the droplet uniform.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the resin microparticles | fine-particles of the uniform particle diameter used for a chemical | medical, medical, electronic material field | area etc., the resin microparticles | fine-particles, and the manufacturing apparatus of resin microparticles | fine-particles can be provided.

Hereinafter, embodiments of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

(Example 1)
First, a resin fine particle manufacturing apparatus as shown in FIG. 3 was produced.
In the apparatus shown in FIG. 3, reference numeral 1 denotes a container of the liquid polymerizable monomer M, and the jet outlet 2 composed of a nozzle having an inner diameter of 0.3 mm connected to the container 1 via a pump P is transparent. Opened in the liquid dispersion medium D accommodated in the dispersion container 3.

The monomer M ejected from the ejection port 2 into the liquid dispersion medium D is vibrated by a vibrator 4 connected to a member that supports the ejection port 2 to generate droplets. The right side of the dispersion container 3 is set to intermittently photograph the state of droplet breakup every 5 seconds, and the photographing device 5 having a high-speed shutter of 1 / 10,000 seconds and a magnifying lens is located on the left side. An illuminating device 6 that is connected to the light source I and gives light quantity from the back of the liquid dispersion medium D is attached.

An image photographed by the photographing device 5 is enlarged and displayed on a 14-inch CRT display 7 via the image controller C2, and a manual operation is performed based on the result of visual observation of the state of the diameter of the generated droplet. Thus, it is possible to adjust the diameter of the droplets to be uniform. That is, when the diameter of the droplet is too large, the pump controller C1 is operated to reduce the ejection amount of the liquid polymerizable monomer M, or the function generator FG connected to the amplifier A is operated to operate the liquid. By increasing the vibration frequency of the polymerizable monomer M, the diameter of the droplet is reduced. When the diameter of the droplet is too small, the ejection amount is increased or the frequency is decreased. By reducing, the diameter of the droplet is enlarged, and adjustment to make the diameter of the droplet uniform by manual operation is performed.

Subsequently, resin fine particles were produced using this apparatus.
50 parts by weight of divinylbenzene and 50 parts by weight of trimethylolpropane trimethacrylate are mixed to prepare a liquid polymerizable monomer M, and 2 parts by weight of benzoyl peroxide is added as a polymerization initiator and injected into the container 1 did.
The monomer M is contained in the glass dispersion vessel 3 and is 4.96 mL / min from the jet port 2 having an inner diameter of 0.3 mm in the liquid dispersion medium D in which 3% of polyvinyl alcohol is added to water. The vibrator 4 vibrated the liquid dispersion medium D from which the monomer M was ejected at a frequency of 200 Hz to generate droplets.
Based on the result of visual observation of the state of the diameter of the generated liquid droplets, an adjustment is made to make the diameters of the liquid droplets uniform by manual operation based on the image of the diameter of the generated liquid droplets, which is captured by the photographing device 5 and enlarged and displayed on the CRT display It was.

After a predetermined amount of the monomer M was ejected, a stirrer and a cooling pipe were installed in the dispersion vessel 3 and heated and stirred to polymerize the monomer M to obtain resin fine particles. The obtained resin fine particles had an average particle diameter of 602 μm, and 92% of resin fine particles were contained in a range of ± 10% of the average particle diameter.

(Example 2)
The apparatus for producing resin fine particles shown in FIG. 4 was produced.
In the apparatus shown in FIG. 4, a droplet diameter measuring device S is attached to the right side of the dispersion container 3, and an image photographed by the photographing device 5 is measured via the image controller C2. S is sent to S, the particle diameter of the formed droplet is measured, and the result of calculation processing of the measured value is fed back to the pump controller C1 or the function generator FG, and the droplet diameter is made uniform by automatic operation. Adjustments are made.

Subsequently, resin fine particles were produced using this apparatus.
Using the apparatus shown in FIG. 4, resin fine particles were produced in the same manner as in Example 1 except that the liquid polymerizable monomer M was prepared using tetramethylolmethane tetraacrylate instead of trimethylolpropane trimethacrylate. did.
The average particle size of the obtained resin fine particles was 599 μm, and 89% of the resin fine particles were contained in the range of ± 10% of the average particle size.

(Example 3)
Resin fine particles were produced in the same manner as in Example 1 except that the apparatus shown in FIG. 4 was used. That is, the liquid dispersion medium D from which the liquid polymerizable monomer M was discharged was vibrated to generate droplets. The diameter of the generated droplets was measured by the measuring device S, and the result obtained by calculating the measured values was fed back to the pump controller C1, and adjustment was performed to make the droplet diameters uniform by automatic operation. After a predetermined amount of the monomer M was ejected, a stirrer and a cooling pipe were installed in the dispersion vessel 3 and heated and stirred to polymerize the monomer M to obtain resin fine particles.
The obtained resin fine particles had an average particle size of 601 μm, and 95% resin fine particles were contained in a range of ± 10% of the average particle size.

(Comparative Example 1)
Resin fine particles were obtained in the same manner as in Example 1 except that the CCD camera and the CRT monitor were not used and the ejection conditions and frequency conditions were not adjusted.
The obtained resin fine particles had an average particle diameter of 688 μm, and contained only 78% of particles in the ± 10% range.

(Comparative Example 2)
A resin fine particle production apparatus similar to the apparatus used in Example 1 was prepared except that three jet nozzles 2 having an inner diameter of 0.3 mm were arranged in parallel and opened in the liquid dispersion medium D.
Using this apparatus, droplets were generated in the same manner as in Example 1 except that the liquid polymerizable monomer M was ejected from the three ejection ports 2 at a rate of 15.9 mL / min. The images photographed by the photographing device 5 and enlarged and displayed on the CRT display 7 could not be individually visually recognized because the droplets overlapped.
The resin fine particles obtained by polymerizing the monomer M without adjusting the droplet diameter to be uniform by manual operation have an average particle diameter of 610 μm and within ± 10% of the average particle diameter. Only 65% resin fine particles were contained.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the resin microparticles | fine-particles of the uniform particle diameter used for a chemical | medical, medical, electronic material field | area etc., the resin microparticles | fine-particles, and the manufacturing apparatus of resin microparticles | fine-particles can be provided.

It is a schematic diagram showing the case where a droplet is normally formed from the liquid column of a polymerizable monomer. It is a schematic diagram which shows the case where a droplet is not formed from the liquid column of a polymerizable monomer due to poor constriction. It is a conceptual diagram which shows the manufacturing apparatus of the resin fine particle used in Example 1. FIG. It is a conceptual diagram which shows the manufacturing apparatus of the resin fine particle used in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid polymerizable monomer container 2 Spout 3 Dispersion container 4 Vibrator 5 Imaging device 6 Illumination device 7 CRT display A Amplifier C1 Pump controller C2 Image controller D Liquid dispersion medium FG Function generator M Liquid polymerizable monomer Body P Pump S Measuring device

Claims (5)

In the continuous phase, a liquid composed of a polymerizable monomer is discharged as a dispersed phase, and mechanical liquid is applied to break up the liquid composed of the polymerizable monomer to form droplets. A method of producing resin fine particles by polymerizing in a state where no splitting or coalescence is achieved,
A method for producing resin fine particles, comprising measuring a particle diameter of the formed droplet and feeding back the result to a discharge condition and / or a mechanical vibration condition of the liquid composed of the polymerizable monomer. Resin fine particles produced by the method for producing resin fine particles according to claim 1, wherein the average particle size is 10 to 3000 μm, and 80% or more is included in a range of ± 10% of the average particle size. Resin fine particles characterized by An apparatus for performing the method for producing resin fine particles according to claim 1, comprising: a dispersion container, a jet opening that opens in the dispersion container and discharges a liquid composed of a polymerizable monomer in a liquid dispersion medium, and a liquid A means for applying mechanical vibration to a liquid composed of a polymerizable monomer ejected into a dispersion medium, and a photographing device for photographing a formed droplet;
An image obtained by photographing the state of droplet formation by the photographing device is taken into a computer, the particle diameter of the droplet is measured by an image processing device, and the result is a discharge condition of the liquid composed of the polymerizable monomer and An apparatus for producing resin fine particles, which is fed back to mechanical vibration conditions. An apparatus for performing the method for producing resin fine particles according to claim 1, comprising: a dispersion container, a jet opening that opens in the dispersion container and discharges a liquid composed of a polymerizable monomer in a liquid dispersion medium, and a liquid A means for applying mechanical vibration to the liquid composed of the polymerizable monomer ejected into the dispersion medium, and a means for measuring the particle diameter of the formed droplets,
An apparatus for producing resin fine particles, wherein the particle diameter of a droplet measured by the measuring means is fed back to a discharge condition and / or a mechanical vibration condition of a liquid made of the polymerizable monomer. 5. The resin fine particle according to claim 4, further comprising means for adjusting a discharge condition and / or a mechanical vibration condition of the liquid composed of the polymerizable monomer based on the measurement result of the particle diameter of the droplet. Manufacturing equipment.

Images