KR102387212B1 - Method for producing emulsion dispersion - Google Patents

Abstract

A method for producing an emulsified dispersion, wherein an emulsified dispersion of a fatty acid amide having an average particle diameter of 1.5 µm or less by a dynamic light scattering method is obtained by a wet dispersion method, wherein the dispersion ratio obtained by the following formula (1) is 85% or more.
Dispersion rate (%) = (solid content concentration of emulsified dispersion liquid passing through 100 mesh plain weave wire mesh (based on JIS G3555-2004) made of stainless steel wire having a wire diameter of 0.10 mm)/(theoretical solid content concentration) x 100... formula ( One)

Description

Method for producing an emulsion dispersion {METHOD FOR PRODUCING EMULSION DISPERSION}

The present invention relates to a process for preparing an emulsified dispersion of fatty acid amides.

Emulsified dispersions of fatty acid amides are used in various fields and tend to be required to have a small average particle diameter for the purpose of high functionality. As a method of dispersing a fatty acid amide in water, for example, Patent Document 1 exemplifies a method of emulsifying and dispersing the fatty acid amide by high shear force using a homogenizer or the like above the melting temperature of the fatty acid amide under pressure. In such a method, an emulsion dispersion of a fine fatty acid amide having an average particle diameter of 1 µm or less can be prepared, but since a pressurized vessel is used, the apparatus tends to be enlarged. Moreover, since it manufactures under high temperature and pressure, there exists a tendency which should consider safety|security.

Japanese Laid-Open Patent Publication No. 2002-18254

The present invention provides a method for producing an emulsified dispersion of fatty acid amide, wherein an emulsified dispersion of fatty acid amide having a fine average particle diameter and few coarse particles can be obtained by a simple and safe method. The purpose.

MEANS TO SOLVE THE PROBLEM The present inventors came to complete the invention as described in the following [1]-[9], as a result of earnestly examining in order to solve the said subject.

[1] A method for producing an emulsified dispersion, wherein an emulsified dispersion of a fatty acid amide having a dispersion obtained by the following formula (1) of 85% or more and an average particle diameter of 1.5 µm or less by a dynamic light scattering method is obtained by a wet dispersion method.

Dispersion rate (%) = (solid content concentration of emulsified dispersion liquid passing through 100 mesh plain weave wire mesh (based on JIS G3555-2004) made of stainless steel wire with a wire diameter of 0.10 mm)/(theoretical solid content concentration) x 100... formula ( One)

[2] The method for producing an emulsified dispersion according to [1], wherein the dispersion ratio is 90% or more and the average particle diameter by the dynamic light scattering method is 1 µm or less.

[3] The wet dispersion method is carried out by stirring a mixture containing an aliphatic amide powder, a surfactant, and water with a wet dispersion device in the presence of a dispersion medium,

The method for producing an emulsified dispersion according to [1] or [2], wherein the amount of the surfactant to be used is 6 parts by mass or more and 20 parts by mass or less in terms of solid content with respect to 100 parts by mass of the fatty acid amide powder.

[4] The method for producing an emulsified dispersion according to [3], wherein the diameter of the dispersion medium is 0.5 mm or more and 3.0 mm or less.

[5] The method for producing an emulsified dispersion according to [3] or [4], wherein the amount of water used is 100 parts by mass or more and 500 parts by mass or less with respect to 100 parts by mass of the fatty acid amide powder.

[6] The method for producing an emulsified dispersion according to any one of [3] to [5], wherein the amount of the dispersion medium used is 200 parts by mass or more and 600 parts by mass or less with respect to 100 parts by mass of the fatty acid amide powder.

[7] The method for producing an emulsified dispersion according to any one of [3] to [6], wherein the filling rate of the dispersion medium in the total capacity of the container of the wet dispersion apparatus is less than 30 vol%.

[8] The method for producing an emulsion dispersion according to any one of [3] to [7], wherein 0.05 parts by mass or more and 0.5 parts by mass or less of an antifoaming agent is added to 100 parts by mass of the fatty acid amide powder.

[9] The method for producing an emulsified dispersion according to any one of [3] to [8], wherein 0.05 parts by mass or more and 0.3 parts by mass or less of a preservative is added to 100 parts by mass of the fatty acid amide powder.

ADVANTAGE OF THE INVENTION According to this invention, an emulsion dispersion liquid can be manufactured safely under normal temperature and normal pressure, without requiring a pressurization container. Moreover, since the emulsion dispersion liquid obtained is fine with an average particle diameter of 1.5 micrometers or less and there are few coarse particles, high functionalization can be provided in various fields.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described.

Examples of the fatty acid amide powder usable in the present invention include saturated fatty acid monoamides such as lauric acid amide, palmitic acid amide, stearic acid amide, and behenic acid amide; unsaturated fatty acid monoamides such as oleic acid amide, erucic acid amide, and ricinolic acid amide; Substituted amino acids such as N-stearyl stearic acid amide, N-oleyl oleic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, and N-oleyl palmitic acid amide Drew ; methylol amides such as methylol stearic acid amide and methylol behenic acid amide; Methylenebisstearic acid amide, ethylenebiscapric acidamide, ethylenebislauric acidamide, ethylenebisstearic acidamide, ethylenebisisostearic acidamide, ethylenebishydroxystearic acidamide, ethylenebisbehenic acidamide, hexamethylenebisstear saturated fatty acid bisamides such as acid amide, hexamethylenebisbehenamide, hexamethylenebishydroxystearic acidamide, N,N'-distearyladipic acidamide, and N,N'-distearylsebaxamide; Unsaturated aliphatic bisamides, such as ethylenebisoleic acid amide, hexamethylenebisoleic acid amide, and N,N'- dioleyl adipic acid amide; Aromatic bisamides, such as m-xylylene bis stearic acid amide, etc. are mentioned, These can be used 1 type, or 2 or more types.

Surfactants that can be used in the present invention include, for example, sulfuric acid ester salts of higher alcohols, alkylbenzenesulfonates, alkyldiphenyletherdisulfonates, aliphatic sulfonates, aliphatic carboxylates, dihydroabietic acid salts, Anionic surfactants, such as a formalin condensate of naphthalenesulfonic acid, sulfate ester salt of a nonionic surfactant, Nonionic surfactants, such as an alkylester type of polyethyleneglycol, an alkylphenyl ether type, and an alkylether type, etc. are mentioned. . These can be used 1 type or in combination of 2 or more type.

Moreover, 6 mass parts or more and 20 mass parts or less are preferable with respect to 100 mass parts of fatty acid amide powder, and, as for the usage-amount of surfactant, 7 mass parts or more is more preferable as a minimum, and 8 mass parts or more are still more preferable. On the other hand, as an upper limit, 15 mass parts or less are more preferable, 13 mass parts or less are still more preferable, and 11 mass parts or less are especially preferable. When the amount of the surfactant used is within the above range, bubbles during dispersion can be suppressed, production is facilitated even in an open disperser, and long-term storage stability of the emulsified dispersion after dispersion can be ensured.

As the usage-amount of water of this invention, 100 mass parts or more and 500 mass parts or less are preferable with respect to 100 mass parts of fatty acid amide powder, As a minimum, 120 mass parts or more are more preferable, and 130 mass parts or more are still more preferable. On the other hand, as an upper limit, 350 mass parts or less are more preferable, and 250 mass parts or less are still more preferable. When the amount of water used is within the above range, the viscosity of the emulsified dispersion from the time of dispersion to after dispersion becomes preferable for industrial production, and fatty acid amide content suitable for industrial use can be ensured.

The emulsified dispersion of the present invention contains the fatty acid amide powder, surfactant, and water as raw materials, and is produced using a wet dispersion method.

The wet dispersion apparatus used in the wet dispersion method of the present invention is not particularly limited as long as it is an apparatus capable of stirring the dispersion medium. For example, an apparatus in which a container rotates or an apparatus in which a container is not rotated and provided with stirring blades and the like. Among them, in consideration of suppression of wear and breakage of the dispersion medium and reduction of noise, an apparatus provided with agitating blades without a container rotating is preferable. Although it does not specifically limit as a material of a container, SUS product is preferable.

When a stirring blade is provided as the wet dispersing apparatus usable in the present invention, examples of the stirring blade include a propeller type, a paddle type, a flat paddle type, a turbine type, a plate type, and a cone type. According to the shape and volume of a container, 1 type or 2 or more types can be used. Although it does not specifically limit as a material of a stirring blade, SUS product is preferable.

As a dispersion medium which can be used for this invention, Hard glass beads, such as a soda glass bead and an alkali free glass bead; Hard plastic beads, such as polymethacrylate; Metal beads, such as a chrome bead and a stainless bead; Metal compound beads, such as a zirconia, a zircon, and a titania; Ceramic beads are mentioned, These can be used 1 type, or 2 or more types. Although the shape of a dispersion medium is not specifically limited, A spherical shape is preferable.

0.5 mm or more and 3 mm or less are preferable, as for the diameter of a dispersion medium, 0.75 mm or more are more preferable as a minimum, and 0.8 mm or more are still more preferable. On the other hand, as an upper limit, 2.5 mm or less is more preferable, and 1.5 mm or less is still more preferable. When the diameter of the dispersion medium is within the above range, submicron atomization of the obtained emulsified dispersion can proceed efficiently, and grinding due to collision between the dispersion media can be suppressed.

Moreover, 200 mass parts or more and 600 mass parts or less are preferable with respect to 100 mass parts of fatty acid amide powder, as for the usage-amount of a dispersion medium, 400 mass parts or less are more preferable as an upper limit, and 300 mass parts or less are still more preferable. When the usage-amount of a dispersion medium is the said range, productivity suitable for industrialization can be ensured and the abrasion of the inner wall of a wet dispersion apparatus by a dispersion medium and agitation blades can be reduced.

Moreover, it is preferable that the filling rate of the dispersion medium in the total capacity of the container of a wet dispersion apparatus is less than 30 volume%. When the filling rate is less than 30% by volume, the frequency of replacing the dispersion medium decreases, so that the productivity tends to be good.

Furthermore, it does not matter if well-known additives, such as an oxygen supplement, a chelating agent, a dispersing agent, an antifoaming agent, an anti-aging agent, a preservative, an antibacterial agent, a flame retardant, and a ultraviolet absorber, are used as needed, It can use suitably and appropriate amount according to the objective. Especially, it is preferable to add an antifoaming agent and an antiseptic|preservative. As for the addition amount of an antifoamer, 0.05 mass part or more and 0.5 mass part or less are preferable with respect to 100 mass parts of fatty acid amide powders. When the antifoaming agent is added within the above range, foaming is suppressed, production stability is improved, and the filterability of the emulsified dispersion tends to be improved. The amount of the preservative added is preferably 0.05 parts by mass or more and 0.3 parts by mass or less with respect to 100 parts by mass of the fatty acid amide powder. When the preservative is added within the above range, decay of the organic matter remaining in the wet dispersion device after taking out the emulsified dispersion can be suppressed, and the maintainability of the wet dispersion device tends to be improved.

As an antifoaming agent, polyglycol, fatty acid ester, phosphoric acid ester, silicone oil, silica etc. are mentioned, for example, 1 type or 2 or more types can be used.

Preservatives include, for example, butylparaben, 5-chloro-2-methyl-4-isothiazolin-3-one, sorbic acid, potassium sorbate, p-chloro-m-xylenol, 1,2-benzoiso Thiazolin-3-one, 2-bromo-2-nitropropane-1,3-diol, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazoline-3 -on etc. are mentioned, 1 type or 2 or more types can be used.

A preferred embodiment of the present invention is dispersion with respect to 100 parts by mass of fatty acid amide powder, 6 parts by mass or more of surfactant (solid content) and 15 parts by mass or less, 100 parts by mass or more of water and 500 parts by mass or less, and 0.5 mm or more and 3.0 mm in diameter. An emulsified dispersion is prepared by stirring 150 parts by mass or more and 600 parts by mass or less of the media in a wet dispersion device for 5 hours or more and 30 hours or less.

3 hours or more and 30 hours or less are preferable, as for stirring time, as a minimum, 5 hours or more are more preferable, 8 hours or more are still more preferable, and 10 hours or more are especially preferable. On the other hand, as an upper limit, 25 hours or less are more preferable, and 20 hours or less are the most preferable. When the stirring time is within the above range, the fatty acid amide in the emulsion dispersion can be more dispersed.

The average particle diameter of the emulsion dispersion obtained by the manufacturing method of this invention is 1.5 micrometers or less, and it is preferable that it is 1 micrometer or less. The average particle diameter is measured by a dynamic light scattering method, and the analysis method is a photon correlation method. When the average particle diameter of the emulsion dispersion liquid is 1.5 µm or less, solid-liquid separation when stored for a long time can be suppressed.

The dispersion rate calculated from the following formula (1) of the emulsified dispersion obtained by the production method of the present invention is 85% or more, preferably 90% or more, and more preferably 95% or more. When the dispersion ratio is 85 % or more, there are few coarse particles, and raw material loss can be suppressed, and the fatty acid amide content in an emulsion dispersion liquid can be controlled stably.

Dispersion rate (%) = (solid content concentration of emulsified dispersion liquid passing through 100 mesh plain weave wire mesh (based on JIS G3555-2004) made of stainless steel wire with a wire diameter of 0.10 mm)/(theoretical solid content concentration) x 100... formula ( One)

7.5 or more and 13 or less are preferable and, as for the pH of the emulsion dispersion liquid obtained by the manufacturing method of this invention, 8.5 or more are more preferable as a minimum. On the other hand, as an upper limit, 12 or less are more preferable.

Moreover, it is preferable that the viscosity of the emulsion dispersion liquid obtained by the manufacturing method of this invention is 600 mPa*s or less. The viscosity is measured at a liquid temperature of 25°C using a B-type viscometer, after passing through a 100-mesh plain weave wire mesh (based on JIS G3555-2004) made of a stainless steel wire having a wire diameter of 0.10 mm. When a viscosity is 600 mPa*s or less, the handleability at the time of pipe-feeding an emulsion dispersion liquid becomes favorable.

The production method of this embodiment is a method for producing an emulsified dispersion, wherein a mixture containing an aliphatic amide powder, a surfactant, and water is stirred in the presence of a dispersion medium with a wet dispersion device, wherein the amount of the surfactant is , The production method may be a production method in which the content is 6 parts by mass or more and 20 parts by mass or less in terms of solid content, and the diameter of the dispersion medium is 0.5 mm or more and 3.0 mm or less with respect to 100 parts by mass of the fatty acid amide powder. As each structural requirement in such a manufacturing method, the thing similar to the above is applicable.

Example

Hereinafter, the present invention will be specifically described using Examples, but the present invention is not limited by these at all.

<Measuring method of average particle diameter>

The average particle diameter of the obtained emulsion dispersion liquid was passed through a 100-mesh plain weave wire mesh (according to JIS G3555-2004) made of a stainless steel wire having a wire diameter of 0.10 mm, followed by a dynamic light scattering method using FPAR-1000 (manufactured by Otsuka Electronics). was measured and calculated by the photon correlation method.

<Measuring method of dispersion rate>

After passing the obtained emulsion dispersion liquid through a 100-mesh plain weave wire mesh (according to JIS G3555-2004) made of stainless steel wire with a wire diameter of 0.10 mm, the solid content concentration in the emulsion dispersion liquid passing through the plain weave wire mesh was measured, and the following formula ( 1) was obtained from .

Dispersion rate (%) = (solid content concentration of emulsified dispersion liquid passing through 100 mesh plain weave wire mesh (based on JIS G3555-2004) made of stainless steel wire with a wire diameter of 0.10 mm)/(theoretical solid content concentration) x 100...(1 )

In addition, the solid content concentration of the emulsion dispersion liquid which passed through the plain weave wire mesh was measured as follows. That is, about 2 g of the emulsion dispersion liquid was precisely weighed in the weighed aluminum cup, and the weight before drying of the emulsion dispersion liquid was X g. This was dried at 140 degreeC in oven for 60 minutes, the aluminum cup weight was subtracted from the weight after drying, and it was set as the weight Yg after drying of an emulsion dispersion liquid. The solid content concentration of the emulsion dispersion was calculated from the following formula (2).

Solid content concentration (%) = Y/X × 100 ... (2)

In addition, the theoretical solid content concentration was computed from following formula (3).

Theoretical solid content concentration (%) = (weight of injection raw material other than water component)/(weight of total injection material including water component) x 100...(3)

<Method for measuring viscosity>

After passing the obtained emulsion dispersion liquid through a 100-mesh plain weave wire mesh (according to JIS G3555-2004) made of a stainless steel wire having a wire diameter of 0.10 mm, using a B-type viscometer, in accordance with JIS K7117-1, at a liquid temperature of 25°C measured.

(Example 1)

Ethylene bis stearic acid amide against a dispersion device having a SUS container having a diameter of 90 mm and a height of 200 mm, and a plate-type blade made of SUS having four holes having a diameter of 70 mm, a thickness of 10 mm, and a diameter of 15 mm. 80 g of powder, 5.2 g of potassium stearate, 120 g of ion-exchanged water, and 200 g of hard glass beads with a diameter of 1.2 mm were put (filling rate of a dispersion medium: 19.8 volume%), and it disperse|distributed at 1000 rpm for 8 hours. The average particle diameter of the obtained emulsion dispersion liquid was 560 nm, the dispersion rate was 93.4 %, and the viscosity was 120 mPa*s.

(Example 2)

Dispersion was carried out under the same conditions as in Example 1 except that potassium stearate was 10.4 g and the dispersion time was 15 hours. The average particle diameter of the obtained emulsion dispersion liquid was 510 nm, the dispersion rate was 99.8 %, and the viscosity was 580 mPa*s.

(Example 3)

Dispersion was carried out under the same conditions as in Example 1 except that potassium stearate was 14.0 g and the dispersion time was 10 hours. The average particle diameter of the obtained emulsion dispersion liquid was 490 nm, the dispersion rate was 97.6 %, and the viscosity was 730 mPa*s. Moreover, since there was more amount of potassium stearate than Example 2, it was a thing with a high viscosity.

(Example 4)

Using the same dispersing apparatus as in Example 1, 40 g of ethylenebislauric acid amide powder, 4.0 g of sodium dodecylbenzenesulfonate, 192 g of ion-exchanged water, and 220 g of hard glass beads having a diameter of 1.2 mm were added ( Filling rate: 21.7 volume%), it disperse|distributed at 1000 rpm for 8 hours. The average particle diameter of the obtained emulsion dispersion liquid was 910 nm, the dispersion rate was 99.7 %, and the viscosity was 10 mPa*s.

(Example 5)

Using the same dispersing apparatus as in Example 1, 80 g of ethylene bis-stearic acid amide powder, 7.2 g of potassium oleate, 120 g of ion-exchanged water, and 400 g of stainless steel beads having a diameter of 2.5 mm were put (filling rate of dispersion medium: 12.6%) , was dispersed for 15 hours at 1000 rpm. The obtained emulsified dispersion had an average particle diameter of 1370 nm, a dispersion of 97.9%, and a viscosity of 260 mPa·s.

(Example 6)

Using the same dispersing apparatus as in Example 1, 80 g of ethylenebisstearic acid amide powder, 7.2 g of potassium oleate, 120 g of ion-exchanged water, and 200 g of hard glass beads having a diameter of 1.2 mm were placed (filling rate of dispersion medium: 19.8%) ), was dispersed at 1000 rpm for 10 hours. The average particle diameter of the obtained emulsion dispersion liquid was 530 nm, the dispersion rate was 97.8 %, and the viscosity was 470 mPa*s.

(Example 7)

Dispersion was carried out under the same conditions as in Example 6 except that the dispersion time was set to 35 hours. The average particle diameter of the obtained emulsion dispersion liquid was 680 nm, the dispersion rate was 99.8 %, and the viscosity was 140 mPa*s. Moreover, although the dispersion time was longer than Example 6, the average particle diameter did not become small, but rather became large.

(Example 8)

Dispersion was carried out under the same conditions as in Example 6 except that 0.16 g of an antifoaming agent (trade name: “SH5507” manufactured by Toray Dow Corning Co., Ltd., silicone antifoaming agent) was added and the dispersion time was set to 20 hours. The average particle diameter of the obtained emulsion dispersion liquid was 460 nm, the dispersion rate was 99.7 %, and the viscosity was 260 mPa*s.

(Example 9)

104 g of ion-exchanged water and 0.24 g of an antifoaming agent (trade name "SH5507" manufactured by Toray Dow Corning Co., Ltd., silicone-based antifoaming agent) were added, and dispersion was carried out under the same conditions as in Example 6 except that the dispersion time was set to 20 hours. The average particle diameter of the obtained emulsion dispersion liquid was 500 nm, the dispersion rate was 99.4 %, and the viscosity was 540 mPa*s.

(Example 10)

Dispersion was carried out under the same conditions as in Example 8 except for adding 0.08 g of a preservative (trade name: “Revanax BX-150” manufactured by Shoei Chemical Co., Ltd., isothiazoline-based preservative). The obtained emulsion dispersion liquid had an average particle diameter of 480 nm, a dispersion rate of 99.6%, and a viscosity of 250 mPa·s.

(Example 11)

Dispersion was carried out under the same conditions as in Example 9 except for adding 0.08 g of a preservative (trade name "Revanax BX-150" manufactured by Shoei Chemical Co., Ltd., isothiazoline-based preservative). The average particle diameter of the obtained emulsion dispersion liquid was 560 nm, the dispersion rate was 99.7 %, and the viscosity was 560 mPa*s.

(Example 12)

Dispersion was carried out under the same conditions as in Example 6 except that the dispersion time was set to 4 hours. The average particle diameter of the obtained emulsion dispersion liquid was 530 nm, the dispersion rate was 87.5 %, and the viscosity was 100 mPa*s.

(Comparative Example 1)

Dispersion was carried out under the same conditions as in Example 1 except that potassium stearate was 3.6 g and the dispersion time was 10 hours. The average particle diameter of the obtained emulsion dispersion liquid was 2100 nm, the dispersion rate was 86.3 %, and the viscosity was 90 mPa*s.

(Comparative Example 2)

It disperse|distributed on the conditions similar to Example 5 except having set it as the stainless steel bead of diameter 3.5mm (filling rate of a dispersion medium: 12.6%). The average particle diameter of the obtained emulsion dispersion liquid was 1830 nm, the dispersion rate was 97.1 %, and the viscosity was 110 mPa*s.

Examples 1 to 12 and Comparative Examples 1 and 2 are shown in Tables 1-3. In addition, each component is shown by the part with respect to 100 mass parts of fatty acid amides.

The production methods of Examples 1 to 12 are simple and safety-conscious, and as shown in Tables 1 and 2, the obtained fatty acid amide emulsion dispersions had an average particle diameter of 1.5 µm or less, few coarse particles, and improved handling properties. This was excellent.

As described above, according to the present invention, it is possible to provide a method for producing an emulsified dispersion of fatty acid amide that is simple and considers safety. Therefore, it is suitable for introducing the production of an emulsified dispersion of fatty acid amide, and is suitable as an additive that imparts high functionality in various fields.

Claims (9)

A method for producing an emulsified dispersion, wherein an emulsified dispersion of a fatty acid amide having a dispersion ratio of 85% or more and an average particle diameter of 1.5 µm or less by a dynamic light scattering method obtained by the following formula (1) is obtained by a wet dispersion method, the method comprising:
The wet dispersion method is carried out by stirring a mixture containing an aliphatic amide powder, a surfactant, and water with a wet dispersion device in the presence of a dispersion medium,
The wet dispersion method is to be carried out at room temperature,
The method for producing an emulsified dispersion, wherein the amount of the surfactant used is 6 parts by mass or more and 20 parts by mass or less in terms of solid content with respect to 100 parts by mass of the fatty acid amide powder.
Dispersion rate (%) = (solid content concentration of emulsified dispersion liquid passing through 100 mesh plain weave wire mesh (based on JIS G3555-2004) made of stainless steel wire having a wire diameter of 0.10 mm)/(theoretical solid content concentration) x 100... formula ( One) A method for producing an emulsified dispersion, wherein an emulsified dispersion of a fatty acid amide having a dispersion ratio of 85% or more and an average particle diameter of 1.5 µm or less by a dynamic light scattering method obtained by the following formula (1) is obtained by a wet dispersion method, the method comprising:
The wet dispersion method is carried out by stirring a mixture containing an aliphatic amide powder, a surfactant, and water in the presence of a dispersion medium with a wet dispersion device;
The amount of the surfactant used is 6 parts by mass or more and 20 parts by mass or less in terms of solid content with respect to 100 parts by mass of the fatty acid amide powder,
A method for producing an emulsified dispersion, wherein 0.05 parts by mass or more and 0.3 parts by mass or less of a preservative is added to 100 parts by mass of the fatty acid amide powder.
Dispersion rate (%) = (solid content concentration of emulsified dispersion liquid passing through 100 mesh plain weave wire mesh (based on JIS G3555-2004) made of stainless steel wire having a wire diameter of 0.10 mm)/(theoretical solid content concentration) x 100... formula ( One) 3. The method of claim 1 or 2,
A method for producing an emulsified dispersion, wherein the dispersion ratio is 90% or more and the average particle diameter by a dynamic light scattering method is 1 µm or less. 3. The method of claim 1 or 2,
A method for producing an emulsified dispersion, wherein the diameter of the dispersion medium is 0.5 mm or more and 3.0 mm or less. 3. The method of claim 1 or 2,
A method for producing an emulsified dispersion, wherein the amount of water used is 100 parts by mass or more and 500 parts by mass or less with respect to 100 parts by mass of the fatty acid amide powder. 3. The method of claim 1 or 2,
A method for producing an emulsified dispersion, wherein the amount of the dispersion medium used is 200 parts by mass or more and 600 parts by mass or less with respect to 100 parts by mass of the fatty acid amide powder. 3. The method of claim 1 or 2,
A method for producing an emulsified dispersion, wherein the filling rate of the dispersion medium in the total capacity of the container of the wet dispersion apparatus is less than 30% by volume. 3. The method of claim 1 or 2,
A method for producing an emulsified dispersion, wherein an antifoaming agent is added in an amount of 0.05 parts by mass to 0.5 parts by mass to 100 parts by mass of the fatty acid amide powder. delete