WO2018146940A1

WO2018146940A1 - Composition for electrostatic spray and electrostatic spray device

Info

Publication number: WO2018146940A1
Application number: PCT/JP2017/044761
Authority: WO
Inventors: 亜丘子原田; バンタンダウ
Original assignee: 住友化学株式会社
Priority date: 2017-02-13
Filing date: 2017-12-13
Publication date: 2018-08-16
Also published as: TW201829711A

Abstract

The present invention addresses the problem of providing a composition for an electrostatic spray device which is capable of preventing formation of contaminants on a first electrode of an electrostatic spray device even when sprayed with the electrostatic spray device for a long time. Provided is a composition for an electrostatic spray device which contains (a) an active component and (b) an antioxidant component, and satisfies 0.01 ≤ k ≤ 50, wherein (k) is the ratio between the number of charges provided from the composition to the first electrode and the number of charges provided from a voltage application unit to a second electrode.

Description

Composition for electrostatic spraying and electrostatic spraying device

The present invention relates to a composition for electrostatic spraying and an electrostatic spraying apparatus.

Conventionally, in order to spray an arbitrary active ingredient into a space, an electrostatic spraying device using electrohydrodynamics (EHD) is used. Various compositions are known as a composition containing an arbitrary active ingredient sprayed by such an electrostatic spraying apparatus (see Patent Documents 1 and 2).

For example, the composition of Patent Document 1 has specific electrical conductivity, viscosity, and surface tension.

The composition of Patent Document 2 includes a solvent and an electrolyte having a specific dissociation constant.

Japanese Patent Publication “Japanese Unexamined Patent Application Publication No. 2014-018363 (Released on February 3, 2014)” Japanese Patent Publication “JP 2012-149231 (released on August 9, 2012)”

However, when a conventional composition is sprayed for a long time by an electrostatic spraying device, foreign matter may be formed on the first electrode (spray electrode) of the electrostatic spraying device depending on the use conditions.

The present invention has been made in view of this point. The objective of this invention is providing the composition for electrostatic spraying which can suppress formation of the foreign material in the 1st electrode of an electrostatic spraying apparatus, even when it is a case where it sprays for a long time with an electrostatic spraying apparatus. is there.

The composition for electrostatic spraying which concerns on 1 aspect of this invention applies a voltage by the voltage application part between the 1st electrode and 2nd electrode of an electrostatic spraying apparatus, and from the front-end | tip of the said 1st electrode. A composition for spraying for spraying, wherein the composition contains (a) an active component and (b) an antioxidant component, and k represented by the following formula (1) is 0.00. In the following formula (1), the number of charges provided from the composition to the first electrode is represented by the following formula (2). In the following formula (1), the voltage application The number of charges provided from the portion to the second electrode is represented by the following formula (3).

k = (number of charges provided from the composition to the first electrode) / (number of charges provided from the voltage application unit to the second electrode) Formula (1)
Number of charges donated from the composition to the first electrode = molar concentration of the antioxidant component (mol / l) × number of electrons donated from one molecule of the antioxidant component to the first electrode × spray amount (l / s) X Avogadro constant (mol ^-1 ) Formula (2)
Number of charges provided from the voltage application unit to the second electrode = current (C / s) / elementary electric charge (C) (3)

According to the composition for electrostatic spraying according to one aspect of the present invention, the formation of foreign matter in the first electrode of the electrostatic spraying device can be suppressed even when used for a long time by the electrostatic spraying device. There is an effect.

It is a functional block diagram which shows the structure of the principal part of the electrostatic spraying apparatus which concerns on Embodiment 1. FIG. It is a figure for demonstrating the external appearance of the electrostatic spraying apparatus of FIG. It is a figure for demonstrating a spray electrode and a reference electrode. It is a figure which shows the compounding example of each component of a composition as a comparative example and Example of Embodiment 2. FIG. It is an enlarged view of the front-end | tip of the spray electrode of an electrostatic spraying apparatus. It is a figure which shows the compounding example of each component of a composition as a comparative example and Example of Embodiment 2. FIG. It is an enlarged view of the front-end | tip of the spray electrode of an electrostatic spraying apparatus. It is a figure which shows the compounding example of each component of a composition as a comparative example and Example of Embodiment 2. FIG. It is a figure which shows the evaluation result of the influence which the said composition has on a Taylor corn when the composition which concerns on FIG. 8 is sprayed for a long period of time. It is a figure which shows the example of a mixing | blending of each component of a composition as an Example of Embodiment 2. FIG. It is a figure which shows the evaluation result of the influence which the said composition has on a Taylor corn when the composition which concerns on FIG. 10 is sprayed for a long period of time. It is the schematic explaining the cause which a foreign material generate | occur | produces at the front-end | tip of a 1st electrode. It is a figure which shows an example of the iron oxide accumulate | stored in the front-end | tip of a 1st electrode. It is a figure which shows the method of detecting a part of composition which does not spread | diffuse in air when a composition is sprayed using the 1st electrode shown in FIG. 13 using oil sensitive paper. It is a figure which shows the oil sensitive paper obtained by the method shown in FIG. It is a figure which shows the composition sprayed from the front-end | tip part of a spray electrode when spraying a composition using the spray electrode which the foreign material has adhered to the front-end | tip.

[Concept of the Invention of the Present Application]
The inventors have noted that when a conventional composition is sprayed for a long time by an electrostatic spraying device, foreign matter can be formed on the first electrode (spray electrode) of the electrostatic spraying device depending on the use conditions. . And the inventors confirmed that the spraying performance of the electrostatic spraying device deteriorates when foreign matter is formed on the first electrode.

In general, the electrodes (specifically, the first electrode and the second electrode) used in the electrostatic spraying device are sprayed every time a certain amount of the composition is sprayed (in other words, in order to maintain good spraying performance). , Every time it was used, it was replaced with a new electrode. The inventors tried spraying a larger amount of the composition with the same electrode than before or using the same electrode for a longer period of time than the conventional one in consideration of environmental load. It has been found that foreign matter is formed on the electrode (in other words, the first electrode) to which the object is sprayed.

In order to clarify the cause of the formation of foreign matter on the first electrode, the inventors analyzed the foreign matter and found that the main component of the foreign matter is a metal oxide derived from the component of the first electrode. . Based on this result, the inventors assumed that foreign matters are generated in the following steps (1) to (6). With reference to FIG. 12, it demonstrates concretely as follows. FIG. 12 is a schematic diagram for explaining the cause of the occurrence of foreign matter at the tip of the first electrode. In the following, a case where the first electrode is made of SUS will be described as an example, but the first electrode is not limited to SUS.

(1) A voltage is applied by a voltage application unit between the first electrode and the second electrode so that the first electrode is at a higher potential than the second electrode, whereby the first electrode is connected to the second electrode. Electrons (e ⁻ ) move to

(2) Since the electrons emitted from the first electrode are electrons derived from the composition, a positively charged composition is sprayed from the first electrode. On the other hand, electrons emitted from the first electrode and electrons provided from the voltage application unit are emitted from the tip of the second electrode.

(3) In the emission of electrons from the first electrode to the second electrode, when electrons cannot be sufficiently supplied from the composition to the first electrode, from the metal (mainly iron) constituting the first electrode itself Electrons will be emitted.

(4) The emission of electrons from iron causes ionization of iron (Fe → Fe ²⁺ + 2e ⁻ , in other words, oxidation of iron) (which is a small amount compared to iron, but also oxidation of metals other than iron (eg manganese)). Occur).

(5) The iron ions combine with oxygen in the air, and iron oxide adheres to the tip of the first electrode.

(6) The iron oxide accumulates at the tip of the first electrode along with spraying a certain amount of the composition and using the electrostatic spraying device for a certain period. An example of the iron oxide accumulated at the tip of the first electrode is shown in FIG.

When the composition is sprayed using the first electrode with the metal oxide attached to the tip as shown in FIG. 13, particles that cannot fall (diffuse) in the air and fall (in other words, the composition There is a thing). The presence of such a composition can be confirmed by the method illustrated in FIG. FIG. 14 shows a method of detecting a part of the composition that does not diffuse into the air using oil sensitive paper when the composition is sprayed using the first electrode shown in FIG. Specifically, the oil sensitive paper is exposed about 15 cm vertically below the first electrode while the composition is sprayed in the horizontal direction using the first electrode shown in FIG. Among the sprayed composition, a part of the composition (particles) that cannot be suspended (diffused) in the air falls on the oil-sensitive paper. The fallen composition is represented as black dots on the oil sensitive paper. FIG. 15 shows the oil sensitive paper obtained by the method shown in FIG.

The reason why the sprayed composition cannot float in the air is that the particle size of the composition is large. Accordingly, from FIGS. 13 to 15, when the composition is sprayed using the first electrode with the metal oxide attached to the tip, the particle size of the sprayed composition cannot be controlled, and as a result, the large particle size It was found that a part of the composition was also sprayed. This is thought to be because the Taylor Cone formed at the tip of the first electrode becomes unstable when the composition is sprayed due to the metal oxide adhering to the tip of the first electrode. It is done.

The inventors have intensively studied to solve the above problems (in other words, problems). As a result, the ratio (k) of the number of charges provided from the composition to the first electrode and the number of charges provided from the voltage application unit to the second electrode is in a desired range, that is, 0.01 ≦ k ≦ 50. It became clear that the above problems can be solved by satisfying the above. Hereinafter, an embodiment of the present invention will be described.

Embodiment 1
Hereinafter, the electrostatic spraying apparatus 100 according to the first embodiment will be described with reference to FIGS. 1 to 3. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Electrostatic spray device 100]
The electrostatic spraying apparatus 100 is an apparatus used for spraying aromatic oil, agricultural chemicals, pharmaceuticals, agricultural chemicals, insecticides, air cleaning chemicals, etc., and includes a spray electrode (first electrode) 1 and a reference electrode ( 2nd electrode) 2 and the power supply device 3 are provided.

First, the external appearance of the electrostatic spraying device 100 will be described with reference to FIG. FIG. 2 is a view for explaining the external appearance of the electrostatic spraying device 100.

As shown in the figure, the electrostatic spraying device 100 may have a rectangular shape. A spray electrode 1 and a reference electrode 2 are disposed on one surface of the electrostatic spraying device 100. The spray electrode 1 is located in the vicinity of the reference electrode 2. An annular opening 11 is formed so as to surround the spray electrode 1, and an annular opening 12 is formed so as to surround the reference electrode 2.

A voltage is applied between the spray electrode 1 and the reference electrode 2, whereby an electric field is formed between the spray electrode 1 and the reference electrode 2. From the spray electrode 1, positively charged droplets (in other words, a composition) are sprayed. The reference electrode 2 ionizes the air near the electrode by negatively charging the air near the electrode. The negatively charged air moves away from the reference electrode 2 by the repulsive force between the electric field formed between the electrodes and the negatively charged air particles. This movement generates a flow of air (hereinafter also referred to as an ion flow), and the positively charged droplets are sprayed away from the electrostatic spraying device 100 by the ion flow.

The electrostatic spraying device 100 may have other shapes instead of a rectangular shape. Moreover, the opening 11 and the opening 12 may have a shape different from the annular shape, and the opening dimensions thereof may be adjusted as appropriate.

[Spray electrode 1, reference electrode 2]
The spray electrode 1 and the reference electrode 2 will be described with reference to FIG. FIG. 3 is a view for explaining the spray electrode 1 and the reference electrode 2.

The spray electrode 1 has a conductive conduit such as a metal capillary (for example, 304 type stainless steel, copper, aluminum, titanium, nickel, etc.) and a tip 5 that is a tip. The spray electrode 1 is electrically connected to the reference electrode 2 via the power supply device 3. A spray substance (in other words, the composition described herein, hereinafter also referred to as “liquid”) is present in the conductive conduit, and the spray substance is sprayed from the tip 5. The spray electrode 1 has an inclined surface 9 that is inclined with respect to the axial center of the spray electrode 1, and the tip is narrower and sharper toward the tip 5.

The reference electrode 2 is made of a conductive rod such as a metal pin (for example, 304 type steel pin, copper, aluminum, titanium, nickel, etc.). The spray electrode 1 and the reference electrode 2 are spaced apart from each other at a predetermined interval and are arranged in parallel to each other. The spray electrode 1 and the reference electrode 2 are arranged, for example, at an interval of 8 mm from each other.

The power supply device 3 applies a high voltage between the spray electrode 1 and the reference electrode 2. For example, the power supply device 3 applies a high voltage (for example, 3 to 7 kV) between 1 to 30 kV between the spray electrode 1 and the reference electrode 2. When a high voltage is applied, an electric field is formed between the electrodes, and an electric dipole is generated inside the dielectric 10. At this time, the spray electrode 1 is positively charged and the reference electrode 2 is negatively charged (or vice versa). Then, negative dipoles are generated on the surface of the dielectric 10 closest to the positive spray electrode 1, and positive dipoles are generated on the surface of the dielectric 10 closest to the negative reference electrode 2. Are emitted by the spray electrode 1 and the reference electrode 2. Here, as described above, the charge generated in the reference electrode 2 is a charge having a polarity opposite to the polarity of the liquid. Accordingly, the charge of the liquid is balanced by the charge generated at the reference electrode 2. Therefore, the electrostatic spraying device 100 can achieve spray stability based on the principle of charge balance.

As described above, the electrostatic spraying device 100 is configured to spray the liquid from the tip (tip portion 5) of the spray electrode 1 by applying a voltage between the spray electrode 1 and the reference electrode 2. .

The dielectric 10 is made of a dielectric material such as nylon (for example, nylon 6, nylon 11, nylon 12, and nylon 66), polypropylene, or a polyacetyl-polytetrafluoroethylene mixture. The dielectric 10 supports the spray electrode 1 at the spray electrode mounting portion 6 and supports the reference electrode 2 at the reference electrode mounting portion 7.

[Power supply 3]
The power supply device 3 will be described with reference to FIG. FIG. 1 is a functional block diagram illustrating a configuration of a main part of the electrostatic spraying apparatus 100.

The power supply device 3 includes a power supply 21, a high voltage generator (voltage application unit) 22, and a control circuit (control unit) 24. The high voltage generator 22 may be referred to as a PU (Power Unit).

The power source 21 supplies power necessary for the operation of the electrostatic spraying device 100. The power source 21 may be a well-known power source and includes a main power source or one or more batteries. The power source 21 is preferably a low voltage power source or a direct current (DC) power source, and is configured by combining one or more dry batteries, for example. The number of batteries depends on the required voltage level and the power consumption of the power source. The power source 21 supplies DC power (in other words, DC current and DC voltage) to the oscillator 221 of the high voltage generator 22.

The high voltage generator 22 includes an oscillator 221, a transformer 222, and a converter circuit 223. The oscillator 221 converts DC power (in other words, DC current and DC voltage) into AC power (in other words, AC current and AC voltage). A transformer 222 is connected to the oscillator 221. The transformer 222 converts the magnitude of the alternating current voltage (or the magnitude of the alternating current). A converter circuit 223 is connected to the transformer 222. Converter circuit 223 generates a desired voltage and converts AC power (in other words, AC current and AC voltage) into DC power (in other words, DC current and DC voltage). Usually, the converter circuit 223 includes a charge pump and a rectifier circuit. A typical converter circuit is a Cockloft-Walton circuit.

The control circuit 24 outputs a PWM (Pulse Width Modulation) signal set to a constant value to the oscillator 221. PWM is a method of controlling current and / or voltage by changing the time (pulse width) for outputting a pulse signal. The pulse signal is an electric signal that repeats ON and OFF. For example, the pulse signal is represented by a rectangular wave, and the pulse width that is the voltage output time is represented by the horizontal axis of the rectangular wave.

In the PWM method, a timer (time switch) that operates at a fixed period is used. The pulse width is controlled by setting the position at which the pulse signal is turned ON in this timer. The ratio at which the pulse signal is turned on in a certain period is called “duty cycle” (also referred to as “duty ratio”).

The control circuit 24 includes a microprocessor 241 to cope with various applications. The microprocessor 241 may be designed to further adjust the duty cycle of the PWM signal based on the feedback information (ambient environment information) 25.

The feedback information 25 includes environmental conditions (temperature, humidity, and / or atmospheric pressure), liquid amount, arbitrary settings by the user, and the like. Such information is given to the microprocessor 241 as analog information or digital information, and is processed by the microprocessor 241. The microprocessor 241 is designed to be able to compensate to improve the quality and stability of the spray by changing either the spray interval, the time to turn on the spray, or the applied voltage based on the input information. May be. In this specification, “spray” intends to spray the composition.

As an example, the power supply device 3 includes a temperature detection element such as a thermistor used for temperature compensation. At this time, the power supply device 3 changes the spray interval according to the change in temperature detected by the temperature detection element. The spray interval is a liquid spray interval in which the electrostatic spraying apparatus 100 sprays the liquid and stops the spraying as one cycle. For example, spraying is turned on for 35 seconds (while the power source is applied with a high voltage between the first electrode and the second electrode during spraying) and spraying is stopped (off) for 145 seconds (the power source is stopped during spraying). Consider the case of periodic spray intervals (no high voltage is applied between the first and second electrodes). In this case, the spray interval is 35 seconds + 145 seconds = 180 seconds.

The spray interval can be changed by software built in the microprocessor 241 of the power source. The spray interval may be controlled to increase from the set point when the temperature increases and to decrease from the set point when the temperature decreases. The increase and decrease of the spray interval preferably follow a predetermined index determined by the characteristics of the liquid to be sprayed. For convenience, the compensation change amount of the spray interval may be limited so that the spray interval changes only between 0 to 60 ° C. (for example, 10 to 45 ° C.). As such, extreme temperatures detected and recorded by the temperature sensing element are considered errors and are not considered, and for high and low temperatures, an acceptable but not optimal spray interval is set.

As the feedback information 25, as shown in FIG. 1, the measurement result of the temperature sensor 251, the measurement result of the humidity sensor 252, the measurement result of the pressure sensor 253, and the information 254 on the contents of the liquid (for example, the liquid storage amount is measured with a level meter Information indicating measurement results), measurement results of voltage and current sensor 255, and the like. Further, the information 254 related to the contents of the liquid may include information indicating the viscosity of the liquid (for example, information indicating the result of measuring the viscosity of the liquid with a viscosity sensor (not shown)).

Here, information indicating the surrounding environment of the electrostatic spraying apparatus 100 is referred to as ambient environment information. Feedback information 25 may be used as the surrounding environment information.

As an example, the ambient environment information may include information on at least one of the ambient temperature (temperature), humidity, and atmospheric pressure around the electrostatic spraying device 100. In the first embodiment, the ambient environment information includes (i) information (temperature information) indicating the temperature around the electrostatic spraying device 100, and (ii) information (humidity) indicating the humidity around the electrostatic spraying device 100. Information) is included as an example.

Usually, the control circuit 24 includes an output port for outputting information from the microprocessor 241, and outputs a PWM signal to the oscillator 221 via the output port. The spray duty cycle and spray interval may also be controlled via the same output port that outputs the PWM signal. While the electrostatic spraying device 100 sprays liquid, a PWM signal is output from the control circuit 24 to the oscillator 221.

The control circuit 24 controls the output voltage of the high voltage generator 22 by controlling the amplitude, frequency, duty cycle, or voltage on-off time (or a combination thereof) of the alternating current in the oscillator 221. It may be possible to control.

[Modification of Embodiment 1]
In the first embodiment described above, for the sake of simplification of description, an electrostatic spray device that does not use conventional feedback control (eg, current feedback control, voltage feedback control, current / voltage feedback control, and output power feedback control) is used. The configuration is illustrated. However, in the electrostatic spraying apparatus according to one aspect of the present invention, conventional feedback control may be applied to further improve spray stability.

[Effect of electrostatic spraying device 100]
As described above, the electrostatic spraying device 100 according to the first embodiment includes the spray electrode (first electrode) 1, the reference electrode (second electrode) 2, and the power supply device 3. This makes it possible to form an electric field between the spray electrode 1 and the reference electrode 2. And by using the said electric field, it becomes possible to spray the composition containing arbitrary active ingredients from the front-end | tip of the spray electrode 1 (in other words, it atomizes and injects).

[Embodiment 2]
〔Composition〕
Hereinafter, the composition according to Embodiment 2 will be described. The composition according to Embodiment 2 applies a voltage between a spray electrode (first electrode) and a reference electrode (second electrode) of an electrostatic spraying device by a high voltage generator (voltage application unit), It is a composition for electrostatic spraying for spraying from the tip of the spray electrode. The composition contains (a) an active ingredient and (b) an antioxidant ingredient, and is represented by the following formula (1). K satisfies 0.01 ≦ k ≦ 50, and in the following formula (1), the number of charges provided from the composition to the first electrode is represented by the following formula (2), and in the following formula (1): The number of charges provided from the voltage application unit to the second electrode is a composition for electrostatic spraying represented by the following formula (3):
k = (number of charges provided from the composition to the first electrode) / (number of charges provided from the voltage application unit to the second electrode) Formula (1)
Number of charges donated from the composition to the first electrode = molar concentration of the antioxidant component (mol / l) × number of electrons donated from one molecule of the antioxidant component to the first electrode × spray amount (l / s) X Avogadro constant (mol ^-1 ) Formula (2)
Number of charges supplied from the voltage application unit to the second electrode = current (C / s) / elementary electric charge (C) (3).

In this specification, “(a) active ingredient” may be referred to as “(a) ingredient” or “(a)”. In this specification, “(b) antioxidant component” may be referred to as “(b) component” or “(b)”.

In this specification, the Avogadro constant adopts the 2014 recommended value published by the Committee on Data for Science and Technology (CODATA). Specifically, the Avogadro constant is 6.02140857 (74) × 10 ²³ mol ⁻¹ . The number in parentheses, in other words 74, indicates the uncertainty of the last two digits of 6.002140857, in other words 57.

In this specification, the recommended value for 2014 published by the Science and Technology Data Committee is adopted as the elementary electric quantity. Specifically, the elementary electric charge is 1.6021766208 (98) × 10 ⁻¹⁹ C. The number in parentheses indicates the uncertainty of the last two digits of 1.6021766208.

The value of the Avogadro constant and the elementary electric quantity can be different from the above values as a result of further scientific accuracy obtained in the process of obtaining the Avogadro constant and the elementary electric quantity. If the Avogadro constant and the elementary electric charge become different values in the future, the desirable value of k may be changed based on the new value.

The unit of current “C / s” may be read as the unit “A” (ampere). This is because 1C / s = 1A.

The composition according to Embodiment 2 is preferably sprayed by the electrostatic spraying device 100.

The spray electrode, the reference electrode, and the high voltage generator according to the second embodiment can be the spray electrode, the reference electrode, and the high voltage generator according to the first embodiment.

In the composition according to Embodiment 2, k satisfies 0.01 ≦ k ≦ 50. k is more preferably 0.01 ≦ k ≦ 15, further preferably 0.01 ≦ k ≦ 13, and particularly preferably 0.03 ≦ k ≦ 10. When k is less than 0.01, foreign matter adheres to the tip of the spray electrode of the electrostatic spraying device due to the spraying of the composition over a long period of time, thereby forming a stable Taylor cone at the tip of the spray electrode. No longer formed. When k is larger than 50, (b) an antioxidant component in the composition is deposited on the tip of the spray electrode of the electrostatic spraying device by spraying the composition over a long period of time. The formation of a stable Taylor cone at the tip of the is inhibited. Here, the Taylor cone refers to a cone-shaped region (in other words, a cone shape) formed from the composition at the tip of the spray electrode of the electrostatic spraying device when the composition is sprayed. A stable Taylor corn refers to a Taylor corn that is always kept in a certain shape from the beginning to the end of spraying the composition.

Consider a case in which a voltage is applied by the voltage application unit between the first electrode and the second electrode so that the first electrode has a higher potential than the second electrode. In this case, the current flowing from the second electrode to the first electrode is preferably 0.01 μC / s to 1000 μC / s, more preferably 0.1 μC / s to 100 μC / s, and 0.2 μC / s to 20 μC / s. Is more preferable, and 0.5 μC / s to 5 μC / s is particularly preferable. When the current is in the above range, there is an advantage that the formation of foreign matters on the spray electrode of the electrostatic spraying apparatus after spraying the composition can be suppressed, and the Taylor cone is stable over a long period of time.

<(A) Active ingredient>
(A) An active ingredient intends an active ingredient required when performing a desired process to a process target (object to be processed). (A) As an active ingredient, it is possible to select any ingredient according to the purpose of treatment. Examples of the active ingredient (a) include, but are not limited to, a fragrance, an insecticide, an air cleaning agent and the like. The active ingredient (a) may be hydrophilic or oily.

Specific examples and preferred examples of the fragrance and the air cleaning agent include the fragrance and the air cleaning agent described in JP2012-149231A.

Specific examples and preferred examples of the insecticide include the insecticides described in International Publication No. 2014/0888050.

The composition according to Embodiment 2 preferably contains (a) the active ingredient in an amount of 0.1 to 30 w / w%, more preferably 0.1 to 28 w / w% based on the total amount of the composition. Preferably, it contains 0.3 to 25 w / w%, more preferably 0.5 to 20 w / w%. If (a) the active ingredient is within the above range, the effect of (a) the active ingredient can be sufficiently exerted, and (a) even if the active ingredient is oily, There is no risk of the composition separating.

<(B) Antioxidant component>
(B) The antioxidant component is not particularly limited, but is preferably at least one selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and tert-butylhydroquinone. Two or more antioxidant components may be selected from the group described above.

Examples of the tocopherol include α-tocopherol, β-tocopherol, and γ-tocopherol.

The composition according to Embodiment 2 preferably contains (b) an antioxidant component in an amount of 0.0001 to 1 w / w%, and 0.0001 to 0.8 w / w% based on the total amount of the composition. More preferably, 0.0001 to 0.5 w / w% is more preferable, and 0.0005 to 0.3 w / w% is particularly preferable. When the composition contains the antioxidant component (b) in the above range with respect to the total amount of the composition, there is an advantage that the formation of foreign matters in the spray electrode of the electrostatic spraying device after use of the composition can be suppressed .

<(C) Alcohol>
The composition according to Embodiment 2 has an evaporation rate of 0.4 or more (c) alcohol, preferably an evaporation rate of 0.6 or more (c) alcohol, more preferably an evaporation rate of 0.8 or more. It is preferable that (c) alcohol is included. Here, the evaporation rate is a relative value when the evaporation rate of butyl acetate is 1. The evaporation rate can be measured by the method of ASTM D3539-87. The composition can increase the evaporation rate of the composition by containing (c) alcohol having an evaporation rate of 0.4 or more. Due to the high evaporation rate of the composition, the sprayed composition particles gradually decrease in volume in the air and become smaller particles earlier. As a result, the active ingredient contained in the composition diffuses widely into the air. Therefore, the (c) alcohol-containing composition having an evaporation rate of 0.4 or more has an advantage of being able to suppress dropping before the particles are diffused without being reduced in particle size after being sprayed. Have

In this specification, “(c) alcohol having an evaporation rate of 0.4 or more” may be referred to as “(c) alcohol”, “(c) component”, or “(c)”.

(C) The alcohol is not particularly limited, and examples thereof include ethanol (evaporation rate = 1.5), isopropyl alcohol (evaporation rate = 1.5), and 1-butanol (evaporation rate = 0.47). Among these, ethanol and isopropyl alcohol are preferable from the viewpoint of evaporation rate.

The content of (c) alcohol contained in the composition can be appropriately set in consideration of the following points: (1) Physical properties of (a) and (b) contained in the composition; (2) The composition should be a uniform liquid.

When the composition according to Embodiment 2 includes (c) an alcohol having an evaporation rate of 0.4 or more, the composition preferably includes water at the same time. If it is a mixture in which water and alcohol coexist, the boiling point of the mixture can be lowered by an azeotropic phenomenon. That is, with this configuration, by increasing the evaporation rate of the composition, the particles of the sprayed composition become smaller particles earlier in the air, and as a result, the active ingredient diffuses more widely into the air. Therefore, the composition having the above-described configuration has an advantage that it is possible to better prevent the particles from falling before being diffused without being reduced in particle size after being sprayed.

The composition according to Embodiment 2 preferably contains 5 to 50 w / w% of water and (c) alcohol having an evaporation rate of 0.4 or more based on the total amount of the composition. In other words, the composition according to Embodiment 2 is such that the total amount of water and (c) alcohol having an evaporation rate of 0.4 or more is 5 to 50 w / w% with respect to the total amount of the composition. Preferably there is. The composition preferably contains 5 to 47 w / w% of water and (c) alcohol, more preferably 5 to 45 w / w%, more preferably 6 to 40 w / w, based on the total amount of the composition. It is particularly preferable that it contains w%. When the composition contains water and (c) alcohol in the above range with respect to the total amount of the composition, there is no fear that the component (b) is precipitated and the composition is separated by the component (a). Has the advantage.

<(D) Other components and solvent>
The composition according to Embodiment 2 may contain (d) other components as long as the effects caused by the components (a), (b) and (c), and the physical properties of these components are not affected. . Examples of (d) other components include an electrolyte, a dispersant, an emulsifier, a vaporization accelerator, a surface tension adjusting component, and a viscosity adjusting component.

In this specification, “(d) other components” may be referred to as “(d) component” or simply “(d)”.

The composition according to Embodiment 2 may contain a solvent that is liquid at room temperature in addition to the components (a) to (d). In this specification, “normal temperature” refers to a range of 5 ° C. or more and 35 ° C. or less (20 ± 15 ° C.) defined by JIS Z 8703 (standard state of test place). The solvent is not particularly limited as long as it does not affect the effects of the components (a) to (d) or the physical properties of the components (a) to (d). Specific examples of such a solvent include the solvents described in JP2012-149231A.

[Effect of Embodiment 2]
As described above, the composition according to Embodiment 2 contains (a) an active component and (b) an antioxidant component, and includes the number of charges provided from the composition to the first electrode, and the voltage application unit. The ratio (k) to the number of charges provided to the two electrodes satisfies 0.01 ≦ k ≦ 50. As a result, (1) it is possible to treat the object to be treated according to the purpose, and (2) even when the composition is used for a long time by the electrostatic spraying device, It is possible to provide a composition for an electrostatic spraying device that can suppress the formation of foreign matters derived from one electrode and / or foreign matters derived from component (b).

[Embodiment 3]
Hereinafter, the spraying method of the composition which concerns on Embodiment 3 is demonstrated.

The method for spraying the composition according to Embodiment 3 is as follows:
[1] A voltage is applied between the spray electrode (first electrode) and the reference electrode (second electrode) of the electrostatic spraying device by a high voltage generator (voltage application unit), thereby the spray electrode (first electrode). A method for spraying a composition for electrostatic spraying, comprising a step of spraying a composition for electrostatic spraying from the tip of an electrode), wherein the composition comprises (a) an active ingredient, (b) an antioxidant ingredient, In the composition, k represented by the following formula (1) satisfies 0.01 ≦ k ≦ 50, and the charge provided from the composition to the first electrode in the following formula (1) The number is represented by the following formula (2). In the following formula (1), the number of charges provided from the voltage application unit to the second electrode is represented by the following formula (3). A method of spraying a composition of:
k = (number of charges provided from the composition to the first electrode) / (number of charges provided from the voltage application unit to the second electrode) Formula (1)
Number of charges donated from the composition to the first electrode = molar concentration of the antioxidant component (mol / l) × number of electrons donated from one molecule of the antioxidant component to the first electrode × spray amount (l / s) X Avogadro constant (mol ^-1 ) Formula (2)
Number of charges supplied from the voltage application unit to the second electrode = current (C / s) / elementary electric charge (C) (3).

The composition spraying method according to Embodiment 3 is preferably sprayed with the composition according to Embodiment 2.

The method for spraying a composition according to Embodiment 3 is preferably performed using the electrostatic spraying apparatus according to Embodiment 1.

The composition spraying method according to an embodiment of the present invention may further have the following configuration.

[2] The spraying method according to [1], wherein the composition contains 0.1 to 30 w / w% of the active ingredient (a) with respect to the total amount of the composition.

[3] The spray method according to [1] or [2], wherein the composition contains 0.0001 to 1 w / w% of the antioxidant component (b) with respect to the total amount of the composition.

[4] The composition contains water and (c) alcohol having an evaporation rate of 0.4 or more in a total amount of 5 to 50 w / w% with respect to the total amount of the composition. The spraying method according to any one of [1] to [3], wherein the speed is a relative value when the evaporation rate of butyl acetate is 1.

[5] The antioxidant component (b) is at least one selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and tert-butylhydroquinone. [4] The spraying method according to any one of [4].

[Summary]
The composition according to the first aspect of the present invention is for spraying from the tip of the first electrode by applying a voltage by a voltage application unit between the first electrode and the second electrode of the electrostatic spraying device. The composition for electrostatic spraying, wherein the composition contains (a) an active component and (b) an antioxidant component, and k represented by the following formula (1) is 0.01 ≦ k ≦ 50. In the following formula (1), the number of charges provided from the composition to the first electrode is expressed by the following formula (2). In the following formula (1), the second voltage is applied from the voltage application unit. The number of charges provided to the electrode is represented by the following formula (3): a composition for electrostatic spraying:
k = (number of charges provided from the composition to the first electrode) / (number of charges provided from the voltage application unit to the second electrode) Formula (1)
Number of charges donated from the composition to the first electrode = molar concentration of the antioxidant component (mol / l) × number of electrons donated from one molecule of the antioxidant component to the first electrode × spray amount (l / s) X Avogadro constant (mol ^-1 ) Formula (2)
Number of charges supplied from the voltage application unit to the second electrode = current (C / s) / elementary electric charge (C) (3).

According to said structure, even if it is a case where a composition is sprayed for a long time with an electrostatic spraying apparatus, in the 1st electrode, formation of the foreign material derived from the 1st electrode and / or the foreign material derived from (b) component It becomes possible to provide the composition for electrostatic spraying which can suppress this.

The composition according to aspect 2 of the present invention may include the above-mentioned (a) active ingredient in an amount of 0.1 to 30 w / w% based on the total amount of the composition.

According to the above configuration, (a) the effect of the active ingredient can be sufficiently exerted, and (a) the separation of the composition by the active ingredient can be suppressed.

The composition according to Embodiment 3 of the present invention may include 0.0001 to 1 w / w% of the above-mentioned (b) antioxidant component with respect to the total amount of the composition.

According to said structure, even when it is a case where a composition is sprayed for a long time with an electrostatic spraying apparatus, in the 1st electrode, the formation of the foreign material derived from the 1st electrode and / or the foreign material derived from (b) component is formed. It becomes possible to provide a composition that can be more effectively suppressed.

The composition according to aspect 4 of the present invention contains water and (c) alcohol having an evaporation rate of 0.4 or more in a total amount of 5 to 50 w / w% with respect to the total amount of the composition. Yes, the evaporation rate may be a relative value when the evaporation rate of butyl acetate is 1.

According to the above configuration, since the evaporation rate of the composition is high, the sprayed composition particles become smaller particles earlier in the air, and as a result, the active ingredient diffuses more widely into the air. Therefore, the composition having the above configuration can prevent the particles from falling before being diffused without being reduced in particle size after being sprayed.

In the composition according to aspect 5 of the present invention, the antioxidant component (b) is at least one selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and tert-butylhydroquinone. It may be one.

The electrostatic spraying device according to aspect 6 of the present invention may spray the composition according to any one of the above aspects 1 to 5.

According to said structure, even if it is a case where a composition is sprayed for a long time, formation of the foreign material derived from the 1st electrode and / or the foreign material derived from (b) component in a 1st electrode can be suppressed, static An electrospray apparatus can be provided.

[Examination of numerical range of k]
With reference to FIGS. 4 to 9, a preferable numerical range of k will be specifically described.

<Ascorbic acid>
FIG. 4 is a diagram showing a blending example of each component of the composition. FIG. 5 is an enlarged view of the tip of the spray electrode of the electrostatic spraying device after spraying the composition according to FIG. 4 for a long period of time.

As shown in FIG. 4, the compositions of Comparative Examples 1 and 2 and Examples 1 to 4 contain (a) peach flavor as an active ingredient. Further, the compositions of Comparative Example 2 and Examples 1 to 4 contain ascorbic acid as an antioxidant component (b).

In FIG. 5, various conditions for spraying the composition are as follows.
・ Temperature: room temperature ・ Amount of spray: 7.8 × 10 ⁻⁸ (l / s) for 3 days (20 g in total)
Current: 0.86 × 10 ⁻⁶ (C / s).
Moreover, in FIG. 5, the tip of the spray electrode of the electrostatic spraying apparatus was observed at 200 times using a microscope.

From FIG. 5, k = 0 (in other words, (b) a composition that does not contain an antioxidant component) or k = 0.005 (in other words, (b) a composition that does not contain a desired amount of the antioxidant component). It was confirmed that foreign matter was attached to the tip of the spray electrode of the electrostatic spraying apparatus after spraying for a long time. Moreover, from FIG. 5, the tip of the spray electrode of the electrostatic spraying apparatus after spraying a composition containing ascorbic acid ((b) antioxidant component) for a long period of time so that k = 0.01 or more and 9.4 or less. In this case, it was confirmed that no foreign matter was attached. From these results, it was confirmed that k is preferably 0.01 or more.

<About the effect of (b) antioxidant component in various surrounding environments>
FIG. 6 is a diagram showing a blending example of each component of the composition. FIG. 7 is an enlarged view of the tip of the spray electrode of the electrostatic spray device after the composition according to FIG. 6 has been sprayed for a long time under various conditions. As shown in FIG. 6, the compositions of Comparative Example 3 and Example 5 include (a) a floral flavor as an active ingredient. Moreover, the composition of Example 5 contains ascorbic acid as an antioxidant component (b). In FIG. 7, various conditions for spraying the composition are as follows.
-Temperature ... as described in the figure (15 ° C, 25 ° C, or 35 ° C).
Humidity: As described in the figure (35% RH (Relative Humidity, relative humidity), 55% RH, or 75% RH).
・ Amount of spray: 7.9 × 10 ⁻⁸ (l / s), 3 days (20 g in total)
Current: 2.00 × 10 ⁻⁶ (C / s)
Moreover, in FIG. 7, the tip of the spray electrode of the electrostatic spraying device was observed at a magnification of 200 times using a microscope.

From FIG. 7, it was confirmed that: (1) The composition of Comparative Example 3 (k = 0) had a condition 1 (15 ° C., 35% RH), a condition 2 (25 ° C., 55% RH), And even when sprayed for a long time in any environment of condition 3 (35 ° C., 75% RH), it caused adhesion of foreign matter to the tip of the spray electrode of the electrostatic spraying device; (2) Even when the composition of Example 5 (k = 0.41) was sprayed for a long period of time under any of the

conditions

1, 2 and 3, the tip of the spray electrode of the electrostatic spraying device To prevent foreign matter from adhering to the surface.

<Various (a) Active Components and (b) Antioxidant Components>
FIG. 8 is a diagram showing a blending example of each component of the composition. FIG. 9 is a diagram showing an evaluation result of the influence of the composition on the Taylor cone when the composition according to FIG. 8 is sprayed for a long time.

As shown in FIG. 8, the compositions of Comparative Example 4 and Examples 6-18 included (a) floral fragrance as the active ingredient, and the compositions of Comparative Examples 5 and 19 were (a) active ingredient. Contains marine fragrance. In addition, the compositions of Examples 6 to 19 were prepared by using (b) sodium ascorbate, dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA), tert-butylhydroquinone (TBHQ), or D-α as an antioxidant component. -Tocopherols are each included in the amounts described in the formulation example of FIG. In FIG. 9, the various conditions for spraying the composition are as follows.
・ Temperature: room temperature ・ Amount of spray: 7.7 × 10 ⁻⁸ (l / s), 3 days (total 20 g)
Current: 2.00 × 10 ⁻⁶ (C / s)

Moreover, in FIG. 9, the influence which a composition has on a Taylor cone was specifically evaluated as follows. Using the electrostatic spraying apparatus after spraying 20 g of the composition according to FIG. 8, the composition is sprayed again, and while spraying, the tip of the spray electrode of the electrostatic spraying apparatus is discharged from the tip. A Taylor cone composed of the composition was observed at 200 times using a microscope. At this time, evaluation was performed based on the following criteria.
... Foreign matter is not attached to the tip of the spray electrode, and a Taylor cone similar to the initial operation of the spray electrode (in other words, before spraying the composition for a long period of time) is formed. X: A foreign cone adheres to the tip of the spray electrode, so that a Taylor cone different from the initial operation is formed.
Here, the Taylor cone observed in the initial stage of operation includes generation of a single jet in which the composition is sprayed from only one position at the tip of the spray electrode. On the other hand, as a specific example of “Taylor cone different from the initial stage of operation”, as shown in FIG. 16, generation of multi-jets in which the composition is sprayed from a plurality of locations at the tip of the spray electrode can be mentioned. FIG. 16 shows the composition sprayed from the tip of the spray electrode (in other words, the Taylor cone formed) when the composition is sprayed using the spray electrode having a foreign substance attached to the tip. .

From FIG. 9, k = 0, in other words, (b) the composition containing no antioxidant component was confirmed regardless of the (a) active ingredient contained: (1) the composition After spraying for a long time, foreign matter was formed at the tip of the spray electrode; and (2) After spraying the composition for a long time, a Taylor cone different from the initial operation was formed by the foreign matter. Further, from FIG. 9, the composition in which k is 0.01 ≦ k ≦ 50 confirmed the following regardless of the types and amounts of (a) active component and (b) antioxidant component: 1) After spraying the composition for a long time, no foreign matter was formed at the tip of the spray electrode; and (2) After spraying the composition for a long time, That formed. Moreover, since the composition which concerns on Example 7 contains 0.10 w / w% of (a) component, after spraying a composition, it is confirmed that a floral fragrance is filled in space, (a) It was confirmed that such an effect was sufficiently exhibited. In addition, in the composition according to Example 8 containing 30.00 w / w% of an oily floral fragrance as the component (a), and 49.9945 w / w% of water and (c) alcohol, separation of the component (a) Neither precipitation of the component (b) nor separation of the composition was confirmed.

[Various (d) alcohols]
FIG. 10 is a diagram showing a blending example of each component of the composition. FIG. 11 is a diagram showing an evaluation result of the influence of the composition on the Taylor cone when the composition according to FIG. 10 is sprayed for a long period of time.

As shown in FIG. 10, the compositions of Examples 20 to 22 contain (a) floral fragrance as an active ingredient and (b) sodium ascorbate as an antioxidant ingredient. Moreover, ethanol, isopropyl alcohol, or 1-butanol is included as (d) component. In FIG. 11, various conditions for spraying the composition are as follows.
・ Temperature: room temperature ・ Amount of spray: 7.7 × 10 ⁻⁸ (l / s), 3 days (total 20 g)
Current: 2.00 × 10 ⁻⁶ (C / s)
Moreover, in FIG. 11, the influence which the composition has on the Taylor corn used the same method as the evaluation method and evaluation criteria of the Taylor corn in FIG.

From FIG. 11, it was confirmed that the composition in which k is 0.01 ≦ k ≦ 50 (d) regardless of the type of ethanol: (1) After spraying the composition for a long period of time, No foreign matter was formed at the tip of the spray electrode; and (2) After spraying the composition for a long time, a Taylor cone similar to the initial operation of the spray electrode was formed.

In addition, the inventors prepared a composition not containing water and (c) alcohol, and evaluated the evaporation rate of the composition and the compositions of Examples 20 to 22. Specifically, a fixed amount (0.2 ml) of the composition was placed in a petri dish and left at room temperature for 30 minutes, and the weight of the composition before and after being left was measured. As a result, it was found that 0% of the composition containing no water and (c) alcohol and 15% of the compositions of Examples 20 to 22 were evaporated. From the above results, it was found that the composition containing water and (c) alcohol evaporates faster than the composition containing no water and (c) alcohol. Further, a composition containing no water and (c) alcohol was prepared, and the composition and the compositions of Examples 20 to 22 were sprayed with an electrostatic spraying apparatus as shown in FIG. A composition that falls without diffusing into it was detected using oil sensitive paper. As a result, the composition containing no water and (c) alcohol clearly observed more black spots derived from the composition on the oil-sensitive paper than the compositions of Examples 20-22. From the above results, it was found that the composition containing water and (c) alcohol diffused more widely in the air than the composition containing no water and (c) alcohol.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

In addition, all of the academic literatures and patent literatures described in this specification are incorporated as references in this specification. Unless otherwise specified in this specification, “A to B” indicating a numerical range is intended to be “A or more and B or less”.

1 Spray electrode (first electrode)
2 Reference electrode (second electrode)
22 High voltage generator (voltage application unit)
100 Electrostatic spraying device

Claims

A composition for electrostatic spraying for spraying from the tip of the first electrode by applying a voltage between the first electrode and the second electrode of the electrostatic spraying device by a voltage application unit,
The composition contains (a) an active ingredient and (b) an antioxidant ingredient,
K represented by the following formula (1) satisfies 0.01 ≦ k ≦ 50,
In the following formula (1), the number of charges provided from the composition to the first electrode is represented by the following formula (2),
In the following formula (1), the number of charges provided from the voltage application unit to the second electrode is a composition for electrostatic spraying represented by the following formula (3).
k = (number of charges provided from the composition to the first electrode) / (number of charges provided from the voltage application unit to the second electrode) Formula (1)
Number of charges donated from the composition to the first electrode = molar concentration of the antioxidant component (mol / l) × number of electrons donated from one molecule of the antioxidant component to the first electrode × spray amount (l / s) X Avogadro constant (mol -1 ) Formula (2)
Number of charges provided from the voltage application unit to the second electrode = current (C / s) / elementary electric charge (C) (3)
The composition according to claim 1, wherein the composition contains 0.1 to 30 w / w% of the active ingredient (a) with respect to the total amount of the composition.
3. The composition according to claim 1, wherein the composition contains 0.0001 to 1 w / w% of the antioxidant component (b) with respect to the total amount of the composition.
The composition contains water and (c) an alcohol having an evaporation rate of 0.4 or more in a total amount of 5 to 50 w / w% with respect to the total amount of the composition.
The composition according to any one of claims 1 to 3, wherein the evaporation rate is a relative value when the evaporation rate of butyl acetate is 1.
The antioxidant component (b) is at least one selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and tert-butylhydroquinone. The composition according to claim 1.
An electrostatic spraying device for spraying the composition according to any one of claims 1 to 5.