JP6754587B2 - Manufacturing method of granulated powder cosmetics - Google Patents

Description

The present invention relates to a method for producing a granulated powder cosmetic.

In the fields of pharmaceuticals, cosmetics, foods, etc., a fluidized bed granulation method is widely used in which powders and granules such as powders and granules are fluidized by a gas flow to perform treatments such as granulation, coating, mixing, stirring, and drying. (For example, Patent Document 1).

Patent Document 1 describes a method for producing a spherical powder make-up cosmetic, which granulates a powder composition composed of a hydrophobized pigment using a water-soluble polymer substance as a binder. However, what is described here is a method of granulating a hydrophobic powder, and when the exact same method is applied to a method of producing a cosmetic made from a hydrophilic pigment, a binder and a powder are described. Since the affinity with the body is too strong, it becomes difficult to obtain a good granulated powder. For this reason, the method described in Patent Document 1 cannot sufficiently cope with the production of solid powder cosmetics using hydrophilic powder as a raw material.

In particular, powder cosmetics made of hydrophilic powder require a soft feeling of use when in contact with the skin, so it is necessary to strictly control the hardness and particle size distribution. , It is required to perform highly uniform granulation operation in line with these requirements. It is important to prevent the generation of such particles because the granulated powder containing a large amount of hard particles or particles having an extremely large or small particle size causes deterioration in usability.

Patent Document 2 describes a method for controlling granulation of powder or granular material in a fluidized bed treatment apparatus. In this method, the particle size of the powder or granular material during the granulation operation is measured, and the particle size of the obtained powder or granular material is controlled by changing the spray droplet diameter of the binder solution based on the measurement. Granulation control methods are disclosed.

However, it is not described here that the production conditions are selected according to the properties of the raw material powder to be used, and the spray droplet diameter is changed according to the progress of granulation by actually performing the granulation operation. Is. Therefore, it cannot be applied to the production of granulated powder cosmetics in which the feeling of use as described above has an extremely important effect.

Tokuhei No. 5-77645 Patent No. 3595949

The present invention provides a production method capable of efficiently providing hydrophilic granulated particles having excellent solubility and excellent touch and touch when applied to the skin.

The present invention is a method for producing a granulated powder cosmetic using a fluidized bed granulator, which includes a step of spraying a binder solution having a viscosity at 25 ° C. of 1 to 4000 mPa · S, and spraying in the step. The average particle size (VMD) of the binder solution is 200 to 500 μm, and the temperature inside the tank measured in the vicinity of the spray nozzle in the tank during the granulation step is controlled to be 30 to 70 ° C. This is a method for producing granulated powder cosmetics.

According to the present invention, by controlling the production conditions at the time of granulation, the grain shape distribution and hardness can be satisfactorily controlled at the time of granulating hydrophilic particles, whereby the powder cosmetic having good properties can be controlled. Can be efficiently manufactured.

It is a schematic diagram which shows an example of the fluidized bed granulator used in this invention. It is a schematic diagram which shows the air flow at the time of cleaning a bug filter in an example of the fluidized bed granulator used in this invention.

The present invention is a method for producing a granulated powder having an excellent usability as a cosmetic, and specifically, the spraying conditions of the binder liquid are controlled during granulation by a fluidized bed granulator. It is a thing. As a result, granulation is performed uniformly, and the uniformity of the particle size distribution of the granulated powder can be improved.
Furthermore, it has become clear that the conditions for adding the binder solution are greatly involved in controlling the hardness of the particles, and by controlling the production conditions by such a method of the present invention, the above-mentioned object can be achieved.

More specifically, it was found that the particle size of the binder particles and the temperature control in the vicinity of the spray nozzle are the most important for controlling the suitable conditions when spraying the binder liquid, thereby completing the present invention. is there.

In the present specification, first, an example of the fluidized bed granulator shown in FIG. 1 will be briefly described below. Then, the technical features of the present invention when the apparatus is used will be described, and then a specific manufacturing method will be described. The present invention is not limited to the case where the fluidized bed granulator having the structure shown in FIG. 1 is used.

In the fluidized bed granulator of FIG. 1, air is flowed from the intake port 1 to the exhaust port 8, and in this flow, the air is heated and the binder liquid is sprayed at a predetermined portion, whereby the raw material powder is produced. It is for granulation. In FIG. 1, such an air flow is indicated by an arrow.
The intake port 1 in FIG. 1 is an introduction port for introducing outside air into the device. It is preferable to provide a filter at the intake port 1 to prevent foreign matter such as dust in the outside air from being mixed into the device.

Further, it is preferable to provide the filter 2 in the fluidized bed granulator and completely remove the foreign matter by the filter. Further, in the aspect of FIG. 1, a person having a heat exchanger 3 as a heating means for heating air is described. This involves introducing heated steam into the heat exchanger 3 and indirectly contacting it with air at room temperature via a partition wall to heat the air in the device and at the same time cool it into a liquid state. Is discharged as a drain. The air heated in this way is brought into contact with the raw material powder 5.

The raw material tank for storing the raw material powder 5 preferably has a perforated plate 4 at the bottom thereof. That is, it is desired that the heated air can pass through but the raw material powder 5 cannot pass through. Then, the raw material powder 5 is heated by the introduced heated air.

The fluidized bed granulator of FIG. 1 has a spraying means 6 for spraying the binder liquid on the upper part of the raw material tank. Such a spraying means 6 atomizes a liquid and introduces it into the system. In the presence of such a binder liquid, the heated raw material powders bind to each other and granulation proceeds. On the other hand, the volatile components in the binder liquid evaporate under heating conditions and are discharged to the outside of the system together with the flowing air.

Further, the fluidized bed granulator preferably has a bug filter 7. The bug filter 7 can prevent the raw material powder 5 from being discharged to the outside of the system together with air.

The air introduced into the system is finally discharged from the discharge port 8. The discharge port 8 may be provided with a dust collector in order to prevent the raw material powder 5 from being discharged. Further, it is preferable that an exhaust fan is provided in order to generate an air flow in the fluidized bed granulator as described above.

Further, a bypass may be provided between the intake port 1 and the exhaust port 8 and a bypass damper 13 may be installed. FIG. 1 shows a state in which the bypass damper 13 is closed and air is introduced into the raw material powder 5. In FIG. 2, the bypass damper 13 is opened, and the damper flap 12 and the intake damper 10 are opened. Indicates the closed state. In the state shown in FIG. 2, the air is discharged from the intake port 1 to the exhaust port 8 as it is without passing through the raw material powder 5.

When the fluidized bed granulator as described above is used, a large amount of the raw material powder 5 is trapped in the bag filter 7. Therefore, it is desired to periodically stop the inflow of air into the raw material powder 5 and vibrate the bag filter 7 to knock down the raw material powder 5 captured in the bag filter 7. In such a case, it is preferable to allow air to flow through the bypass as shown in FIG. 2 and perform the work in a state where the air does not flow into the raw material powder 5.

Further, the fluidized bed granulator shown in FIG. 1 has a damper 9 for adjusting the intake amount and a damper 11 for adjusting the exhaust amount. These are provided to adjust the flow rate of air in the system, and the flow rate and temperature of air can be adjusted by adjusting these openings, and the granulation conditions can be adjusted. it can.

Next, the technical features of the present invention will be described in detail based on the above-mentioned example of the fluidized bed granulator of FIG.

The raw material powder 5 flows by introducing heated air into the raw material powder 5 of the fluidized bed granulator. Then, the liquid binder sprayed from the spray port (not shown) of the spraying means 6 acts on the liquid binder, so that the raw material powders 5 are bonded to each other and granulation is performed.

Temperature control in such an air flow is not easy. That is, the temperature of the heated air after heating and the temperature / flow rate of the exhausted air can be easily measured and controlled, but these control the optimum conditions for achieving the above-mentioned object of the present invention. Above, not the best parameter.

This is because granulation occurs in the vicinity of the binder particles sprayed from the spray port of the air spray, so it is important to control and control the conditions at the place where the binder particles and the raw material powder come into contact with each other. .. However, such control and management have not been attempted in the past. In particular, in order to obtain an excellent feeling of use as used in cosmetics, it is important to control the uniformity and hardness of particles by controlling such fine conditions.

The present inventors have studied the spraying conditions of such binder particles, and found that such a problem can be improved by controlling the particle size of the sprayed particles and the temperature in the vicinity of the spray nozzle. It is a thing.

The sprayed binder liquid exists in the vicinity of the nozzle and gradually evaporates in the system. If the evaporation rate is too fast, sufficient granulation will not be performed, and if it is too slow, the particle size of the obtained granulated particles will be coarse.
Further, if the size of the atomized droplets is too large, the evaporation rate of water becomes slow, which causes the generation of coarse particles, and if the size is too small, good granulation cannot be achieved. Therefore, it becomes necessary to control both the temperature near the spray port (not shown) of the spray means 6 and the particle size of the atomized droplets.

The present inventors measure the temperature in the vicinity of such a nozzle, particularly at a point 10 cm to 50 cm away from the nozzle, and perform granulation while controlling this temperature. That is, when the temperature near the nozzle becomes too low, the temperature drop near the nozzle is suppressed by reducing the spray amount of the binder liquid or controlling the air amount, and the temperature near the nozzle becomes high. If it is too much, the reverse operation is performed. Further, in the temperature condition, the temperature and the flow speed of the air flowing through the entire device are also important factors.

Further, when performing such an operation, it is also important to control the average particle size (VMD) of the sprayed binder solution at a point 10 cm to 50 cm away from the nozzle to be 100 to 900 μm, more preferably 200 to 500 μm. Is.
That is, the evaporation rate of the binder liquid is greatly related to the size of the sprayed binder liquid. Therefore, it is an important feature of the present invention to control the temperature and the particle size of the sprayed binder liquid. The average particle size (VMD) of the sprayed binder solution is a value measured by a laser diffraction method.

The temperature near the nozzle and the particle size of the binder liquid are determined by the spray amount of the binder liquid, the balance of the air pressure at the time of spraying, the temperature of the heated air to be introduced, and the like, and these are the optimum conditions. By controlling, the above-mentioned value can be controlled.

When the binder liquid is sprayed by spraying, the air pressure of the sprayed air is preferably 0.05 to 0.7 MPa, more preferably 0.1 to 0.4 MPa.

The spray pattern preferably has a circular, elliptical, or annular cross section.

Next, the granulation method using such an apparatus will be described in detail below.

In the present invention, a hydrophilic powder is granulated to obtain a powder cosmetic. That is, the hydrophilic powder has a high affinity with water, which is a solvent in the binder liquid, and the raw material powders are likely to be bound to each other by the interaction with water, so that granulation is likely to occur. For this reason, phenomena such as excessive granulation and granulation powder becoming hard are likely to occur. For this reason, it has been difficult to obtain a soft granulated powder having high uniformity, especially in the case of hydrophilic powder. In the present invention, such hydrophilic powder is preferably granulated by the method described above.

As the raw material powder in the present invention, a hydrophilic powder is used. Inorganic pigments such as starch, mica, sericite, kaolin, bentonite, barium sulfate, calcium carbonate, silica, titanium oxide, zinc oxide and boron nitride, nylon, PMMA and cellulose are not particularly limited as long as they are hydrophilic powders. , Silk, starch, modified starch and other organic pigments.
In addition, coloring pigments, dyes, water-soluble polymers, surfactants and the like, which are generally blended in other cosmetics, may be blended.

In the present invention, a binder solution having a viscosity at 25 ° C. of 1 to 4000 mPa is used. This is a value measured using a bismethron rotational viscometer (manufactured by Shibaura System Co., Ltd.) under the conditions of rotor NO3, 30 rpm, and 30 seconds.

The components contained in the binder solution are not particularly limited, and components that can be blended in water, hydrocarbon oils, ester oils, silicone oils, waxes, moisturizers, surfactants, viscosity modifiers, fragrances, and other cosmetics can be used. Can be mentioned.

Further, the granulation conditions are appropriately set from the viewpoint of what kind of raw material powder or binder liquid is used and what kind of physical properties are obtained as the properties of the obtained granulated powder. , The desired granulated powder may be obtained.

The granulated powder obtained by the method of the present invention as described above is not particularly limited in its use, but has excellent performance in terms of feel during use and dissolution performance when mixed with water. Therefore, it is used in the cosmetic field such as cleansing agents and skin cosmetics.

Hereinafter, the present invention will be described in more detail by way of examples.

Using a granulator having the structure shown in FIG. 1, a cosmetic powder having the composition shown in Table 1 was granulated. At the time of granulation, the air flow rate, air heating conditions, etc. were performed under normal heating conditions. Further, in each test, granulation was performed while controlling the average particle size of the binder solution and the temperature in the layer near the spray nozzle to be the conditions shown in Table 1. During the granulation operation, the powder in the bug filter was knocked off several times while the air flow was adjusted to the state shown in FIG.

The viscosities in the table are values measured using a Bismetron rotational viscometer (manufactured by Shibaura System Co., Ltd.) under the conditions of rotor NO3, 30 rpm, and 30 seconds. It is a value obtained by measuring the distribution.

(Evaluation)
1. Particle uniformity The particle size distribution measured by particle size distribution measurement or sieving was evaluated by dividing the particle size of 60% under the sieve by the particle size of 10% under the sieve. The evaluation criteria are as shown below.
◎ 1.5 or less ○ 1.5 to 2.0
△ 2.0 or more

2. Usability and foaming We asked 10 panelists to use granulated powder cosmetics, and sensory-evaluated usability and foaming to obtain an average evaluation score.
The evaluation criteria are as shown below.
◎ Very good ○ Good △ Slightly bad

From the results in Table 1, the granulated powder cosmetics produced according to the production method of the present invention have excellent properties in terms of usability as cosmetics as compared with the granulated powder cosmetics of Comparative Examples. It is clear that.

The method for producing a granulated powder cosmetic of the present invention can be used in the production of a cosmetic composed of granulated powder.

1. 1. Intake port 2. Filter 3. Heat exchanger 4. Eye plate 5. Raw material powder 6. Spraying means 7. Bug filter 8. Exhaust port 9. Damper for adjusting the intake amount 10. Intake damper 11. Displacement damper 12. Damper flap 13. Bypass damper

Claims (1)

A method for producing granulated powder cosmetics using a fluidized bed granulator.
Including a step of spraying a binder solution having a viscosity at 25 ° C. of 1 to 4000 mPa · S, the average particle size (VMD) of the sprayed binder solution in the step is 200 to 500 μm, and in the tank during the granulation step. A method for producing a granulated powder cosmetic, which is characterized in that the temperature in the tank measured in the vicinity of the spray nozzle is controlled to be 30 to 70 ° C.