JPH01200A - How to make transparent soap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing transparent soap, and particularly to a method for obtaining transparent soap with excellent transparency by mechanical kneading.

[Conventional technology]

Conventionally, there are two known methods for manufacturing transparent soap: border forming and machine kneading.

Among these methods, most of the formulas for the border line method are fixed, for example, a fatty acid soap is used as a base, and a clarifying agent such as sucrose, glycerin, sorbitol, propylene glycol, or other polyols, ethanol, and water are heated and mixed. After that, it is poured into a frame, cooled and solidified, and after aging and drying for 2 to 3 months, it is molded into a product. Such a border line method is disclosed in, for example, Japanese Patent Publication No. 36-7031, Japanese Patent Publication No. 45-18984, Japanese Patent Publication No. 7555-1987, Japanese Patent Publication No. 42935-1972, Japanese Patent Publication No. 38642-1987, etc. There is.

Transparent soap produced using this border method has excellent transparency, and its crystalline form is so-called ω-type, making it difficult to dissolve in water, so it has the advantage of not losing its transparency during use, but it takes a long time to manufacture. It has disadvantages in that it has poor production efficiency and requires a large space for ripening.

On the other hand, in the mechanical kneading method, a clarifying agent similar to that used in the framing method is added to the fatty acid soap base, and then the crystals are made finer by mechanical force without using a solvent such as ethanol, resulting in transparency. This method has the advantage of being excellent in production efficiency and eliminating the need for aging.

As such a mechanical kneading method, for example, JP-A-58-
A method using a uniaxial kneading extruder having a special cavity structure is disclosed in Japanese Patent No. 208399 and the like.

[Problem that the invention seeks to solve]

However, the conventional mechanical kneading method currently only produces translucent products with extremely low commercial value compared to the border kneading method, and the kneading extruder used is structurally The problem was that it was complicated and the equipment cost was high.

This invention was made in view of the above-mentioned circumstances, and an object thereof is to provide a method for obtaining transparent soap with excellent transparency by mechanical kneading.

[Means for Solving the Problems] As a result of intensive studies to achieve the above object, the inventors identified a soap composition containing a clarifying agent (hereinafter referred to as a transparent soap composition). We discovered that when kneaded using a twin-screw kneading extruder with a kneading zone in which a large number of paddles in a specific configuration are used, transparency can be greatly improved and a product with high commercial value can be obtained. He came up with an invention.

That is, in the present invention, a large number of paddles each having a convex lens cross section in axial cross section forming a pair with a phase difference of 90 degrees between two axes, or a large number of paddles having a substantially triangular axial cross section forming a pair having the same phase between two axes, are arranged on each axis. The present invention relates to a method for producing transparent soap, which is characterized in that a transparent soap composition is kneaded using a twin-screw kneading extruder fixedly installed in a machine, and then the kneaded product is molded into a desired shape.

[Structure and operation of the invention]

As mentioned above, the twin-screw kneading extruder used in this invention has a large number of paddles fixed to each shaft, each having a convex lens cross section and forming a pair with a phase difference of 90 degrees between the two shafts. There are two types: and B, which has a substantially triangular axial cross section and forms a pair with the same phase between the two axes.

Figures 1 to 3 show an example of the former twin-screw kneading extruder A.

This extruder A has two rotating shafts that are synchronously rotated in the same direction by a drive device 2, inside a horizontally long cylindrical trough 1 that has an extrusion port 1a at one end and a hopper tb at the top of the other end. 3a and 3b are arranged in parallel along the horizontal direction,
A large number of paddles 4.degree. 4 each having a convex lens-shaped axial cross section and a screw 5 located on the hopper 1b side, that is, on the base end side, are fixed to both rotating shafts 3a and 3b, respectively.

Then, the paddles 4 of one rotating shaft 3a are arranged in order from the tip side, with the arrangement angle of the one located at the tip of the shaft as a reference (0 degree), 2 0 degrees, 3 45 degrees, 4 90 degrees, and 180 degrees. (
A plurality of sheets are densely arranged such that three sheets (0 degree) and four sheets 135 degrees are arranged so that each sheet has a different phase. In addition, the paddles 4 of the other rotating shaft 3b are arranged in order from the tip side, based on the arrangement angle of the one located at the most extreme end of the rotating shaft 3a (0 degrees): 2 90 degree paddles, 3 paddles 135 degrees, and 4 paddles 0 degree. , 3 paddles 4.4 at 90 degrees, and 4 paddles 4.4 at 45 degrees, adjacent paddles 4.4 are closely arranged in pairs with a phase difference of 90 degrees. In addition, between the inner wall of the trough 1 and each paddle 4, and between each pair of paddles 4.4, both rotating shafts 3.
It is set so that a slight clearance is maintained in the synchronous rotation operations of a and 3b.

In the extruder A having the above configuration, both rotating shafts 3a and 3b are synchronously rotated in the same direction via a motor built in the drive device 2 or a belt or chain with the motor, and the hopper 1
By continuously charging the transparent soap composition into the trough l from b, this charged composition is transferred to the screws 5 and 5.
The crystals are sequentially sent to the kneading zone Z where paddles 4, 4, etc. are arranged by the pressing force, and in the process of moving while being kneaded in this kneading zone Z, the crystals are subjected to mechanical shearing force and are made fine. Finally, the kneaded material with excellent transparency is passed through the extrusion port 1.
It is extruded into a rod shape from a. Then, this extruded kneaded product is molded by molding or the like to obtain a solid soap product in a desired shape. Note that the extrusion port 1a is removable.

Here, the cross section of the kneading zone Z includes both rotating shafts 3a.

Since the paddles 4, 4 forming a pair between 3b rotate synchronously while maintaining a 90 degree phase difference, the results shown in FIGS. 4(a) to (d)
), there are always three zones Z+ * Zz r
It is divided into Z. Taking the shaded zone Z1 as an example, the cross-sectional area of each zone Z, -23 changes from Fig. 4(a) to Fig. 4f as both paddles 4.4 rotate.
It expands in the process of reaching bl, then shrinks in the process of reaching Figure 4(e) and then Figure 4+d), and expands again in the process of reaching Figure 4(a) and then Figure 4(b). Repeat the expansion and contraction like this. Therefore, the transparent soap composition moving through the kneading zone Z is forcibly subjected to repeated volume changes of compression and stretching during this movement process, and as a result, the crystals become extremely fine and uniform, and transparency is significantly improved. do.

Note that the number of paddles installed on each of the rotating shafts 3a and 3b, the phase difference between paddles 4 adjacent to each other in the axial direction, the number of paddles superimposed in each phase group, etc. can be set in various ways, and the kneading can be improved by devising a combination of these. The effect can be adjusted.

In addition, as for the paddle 4, in addition to the usual flat paddle 4a whose both sides are in the same phase as shown in Fig. 5(a), a helical paddle 4b whose both sides are out of phase as shown in Fig. 4 (bl) is used. In other words, the helical paddle 4b
The paddles exert a kneading action as well as a feeding action or a returning action depending on their direction, so by disposing them in combination with the flat paddles 4a at strategic points in the kneading zone Z, the transparent soap composition can be locally distributed within the kneading zone Z. The kneading effect is further improved by forward or reverse feeding.

In addition, the number of arranged helical paddles 4b, the number of flat paddles 4
The installation ratio with a can be set in various ways.

Further, the paddle pairs between both rotating shafts 3a, 3b can be combined in various ways, such as helical paddles 4b, 4b facing the same direction, helical paddles 4b, 4b facing opposite directions, flat paddles 4a, 4a pairing, etc.

Figure 6.7 shows an example of the latter twin-screw kneading extruder B.

In this extruder B, both rotating shafts 13a are arranged in parallel in a trough 11 similar to that in the extruder A.

In 13b, there are a large number of so-called "triangular rice ball-shaped" puzzles, each of which has an approximately equilateral triangular axial cross section with bulging sides.
14... and a screw 15 are fixedly installed. Note that this screw 15 is set to have a small pitch and a shallow root so as to generate a higher torque feed pressure than the screw 5 to the extruder.

Then, each paddle 1 of both rotating shafts 13a, 13b
4 are arranged densely so as to form a phase difference of 60 degrees one after another from the shaft tip side, and both rotating shafts 13a, 13b
Both paddles 14° 14 forming a pair therebetween are set to be in the same phase. In addition, the inner wall of the trough 11 and each paddle 1
4 and between each pair of paddles 14 and 14, both rotating shafts 1
It is set so that a slight clearance is maintained in the synchronous rotation operations of 3a and 13b.

In the kneading extruder B having the above configuration, similarly to the extruder A, both rotating shafts 13a are driven by the drive device 12.

13b are synchronously rotated in the same direction, and the transparent soap composition is continuously charged into the trough 11 from the hopper 11b, and the charged composition is transferred to the paddles 14. ... is sequentially sent to the kneading zone Z arranged in the kneading zone Z, and during the process of moving while being kneaded within this kneading zone Z, the crystals are made fine by the mechanical shearing force, and the kneaded product is pressed as a kneaded product with excellent transparency. Exit 11a
more extruded. The extruded kneaded product is then molded into a product in the same manner as described above. Note that in this extruder B as well, the extrusion port 11a is removable.

Here, the cross section of the kneading zone Z includes both rotating shafts 13a.

Since the pair of paddles 14 and 14 between the paddles 13b maintain the same phase and rotate synchronously, the paddles 14 and 14 in FIG.
As shown in FIG. 8 (al to 8), as shown in FIG. figure(
Enlargement and reduction are repeated such that the image is enlarged in the process of reaching b), then reduced in the process of reaching FIG. Therefore, the transparent soap composition moving through the kneading zone Z is
Similar to the above, the volume changes of compression and stretching are forcibly repeated, which makes the crystals extremely fine and uniform, and the transparency is significantly improved. In addition, in this extruder B, the spatial cross-sectional area of the kneading zone Z is narrower than in the extruder A, and the cross-sectional area of the communication passage with the next pair of paddles is smaller, so that the shearing force received within the trough 11 is transferred to the extruder. becomes even larger than. Therefore, this extrusion jaB is highly effective when the transparent soap composition and its kneaded product have high viscosity.

Although the number of paddles installed on both rotating shafts 13a and 13b and the phase difference between paddles 14.14 adjacent in the axial direction can be set in various ways, it is particularly possible to set the paddles 14.14 adjacent in the axial direction one by one as shown in the example. It is desirable to arrange them with a phase difference of 60 degrees.

Further, as the paddles 14, a flat paddle 14a whose both surfaces are in phase as shown in FIG. 9<8) and a helical paddle 14b whose both surfaces are out of phase as shown in FIG. Can be used in combination for the same purpose. Further, as in the case of extruder A, various combinations of paddle pairs can be set.

As the transparent soap composition used in this invention, a composition similar to that used in conventional mechanical mixing methods, such as a mixture of a fatty acid soap base, a clarifying agent and water, can be used. As the above-mentioned bases, various animal and vegetable fatty acid sodium soaps that have been conventionally known as soap bases, such as beef tallow fatty acid sodium soap, coconut oil fatty acid sodium soap, and castor oil hydrogenated fatty acid sodium soap, can be used alone. Or you can use a mixture of two or more types.
A small amount of a modifier may be added to these.

Furthermore, as a clarifying agent, various conventionally used compounds such as sucrose, glycerin, sorbitol, propylene glycol, polyethylene glycol, and other polyols can be used alone or in a mixture of two or more. be. The amount of the clarifying agent to be added is 3 to 25 parts by weight, preferably 5 to 25 parts by weight, based on 100 parts by weight of the base.
It is best to use about 15 parts by weight.

In addition, various additives such as a chelating agent, a humectant, a dye, and a fragrance may be appropriately blended into the above composition as necessary.

Such a transparent soap composition was mixed and extruded using a twin-screw extruder A.

When sending the above composition to B, the above composition may be neat sorbed by an appropriate means and the dried product may be sent directly, or it may be dried or pre-kneaded by passing it through a roll or a brodder (screw), which is a normal cosmetic soap manufacturing equipment. You can send it in.

In addition, in order to make the kneaded product into an extrudate suitable for molding, in the illustrated kneading extruders A and B, the extrusion ports 1a and 11
A may be used, but the extruder 2 does not have the extrusion ports ta and 11a and has the same configuration as the extruders A and B illustrated above.
The kneaded material obtained using the axial kneading extruder may be further extruded using an extruder equipped with another brooder (cone) section.

In addition, in order to further improve the transparency, it is desirable to set the temperature of the extrusion port in the range of 40 to 60°C when making the above extrudate. For this temperature setting, trough 1 of extruders A and B
, 11 or a separately used extruder, a heating/cooling jacket for passing a heating medium or a cooling medium may be attached around the cylindrical body of the extruder.

According to the method of this invention, by appropriately setting the combination of paddles 4 and 14 of the twin-screw kneading extruders A and B and the length of the kneading zone Z, the transparent soap composition can be passed through the kneading zone Z only once. Transparent soap with excellent transparency can be produced using
Two or more passes may be made if necessary.

〔Effect of the invention〕

As described above, according to the method of the present invention, a transparent soap composition is kneaded using a twin-screw kneading extruder having a kneading zone in which a large number of paddles of a specific shape form a specific arrangement. Transparent soap with high transparency that cannot be achieved by the kneading method can be obtained with high production efficiency without the need for aging. In addition, the above-mentioned kneading extruder has a simple structure, so the equipment cost is low, and the combination of paddles can be easily changed in various designs depending on the properties of the transparent soap composition and the type of product required. There are advantages that can be achieved.

[Examples] Examples of the present invention will be described below to explain more specifically. In the following, parts mean parts by weight and MW mean average molecular weight, respectively. In the examples, Continuous Negoo manufactured by Kurimoto Iron Works was used as the twin-screw kneading extruders A and B.

Example 1 In the twin-screw kneading extruder A shown in Figs. 1 to 3, the length of the trough was 440 cm, and the paddle diameter was 50 m on one rotating shaft 3a.
The paddle 4 having a convex lens shape in the axial section of m is a helical paddle 4.
A total of 2 in combination with 8 b pieces and 16 flat paddle 4a pieces.
The four pieces are closely arranged and fixed, and the other rotating shaft 3b is connected to the rotating shaft 3a.
Both rotating shafts 3a are formed by fixing paddles 4 of the same diameter and the same number that form a pair with each paddle 4 with a phase difference of 90 degrees.

3b in the same direction at a rotation speed of 9 rpm, the following transparent soap composition was added from the hopper 1b: Sodium tallow fatty acid soap 60 parts Sodium coconut oil fatty acid soap 15 parts Glycerin 4 parts Sucrose 3 parts Propylene glycol 2 parts Water
Total remaining
100 parts 1,000 g were put in, the outlet temperature was set at 50°C, and the product was extruded into a bar shape with a diameter of 20 cranes, which was then molded into a bar of soap with a length of 60111 and a width of 40 weight - 1 and a thickness of 2 Q mm. did. The residence time of the transparent soap composition in the twin-screw kneading extruder was about 20 minutes.

Example 2 In the twin-screw kneading extruder A shown in Figs.
A total of 28 paddles 4 having a convex lens shape in the axial cross section of 0 mm are closely arranged and fixed in combination of 12 helical paddles 4b and 4316 flat paddles, and each paddle 4 of the rotating shaft 3a is attached to the other rotating shaft 3b. . Using paddles 4 of the same diameter and the same number that form a pair with a phase difference (D), both rotating shafts 3a and 3b are rotated synchronously in the same direction at the rotation speed (iQrpm) ft 7!J<etc. , the following transparent soap composition was obtained from hopper 1b; beef tallow fatty acid sl-IJum soap 58 parts coconut oil fatty acid sodium soap 14 parts castor hydrogenated fatty acid sodium soap 3 parts glycerin
5 parts propylene glycol 3 parts EDTA
O.05 parts water
Total remaining
5.000 g of 100 parts was added, the extrusion port was removed, and the mixture was kneaded once to obtain chips.

This was again put into the hopper of the twin-screw kneading extruder A equipped with the extrusion port 1a, and the outlet temperature was set at 52°C, and the product was extruded into a rod shape with a diameter of 20 fins in the same manner as in Example 1. It was molded and molded. The residence time per time in the twin-screw kneading extruder was about 30 minutes.

Example 3 The following transparent soap composition: Beef tallow fatty acid sodium soap 56 parts Coconut oil fatty acid sodium soap 14 parts Castor hydrogenated fatty acid sodium stone*3 parts Sorbitol 6 parts Propylene glycol 4 parts EDTA
0.05 parts 'water
Total remaining
100 parts 2.000g at a roll rotation speed of 2Orpm,
3 using triple rolls at 48 rpm and 1107 rpm
Preliminary kneading was carried out at 0° C. for about 5 minutes.

Next, in the twin-screw kneading extruder A shown in FIGS. 1 to 3,
Trough length 660mm, paddle diameter 5 on one rotating shaft 3a
The axial cross-section convex lens shaped paddle 4 of Oryu is a helical paddle 4
A total of 36 paddles (a combination of 18 flat paddles and 4 ala flat paddles) are closely arranged and fixed, and paddles 4 of the same diameter and the same number are paired with each paddle 4 of the rotating shaft 3a with a phase difference of 90 degrees on the other rotating shaft 3b. While rotating both rotating shafts 3a and 3b synchronously in the same direction at a rotational speed of 18 rpm, the above pre-kneaded transparent soap composition was introduced from the hopper 1b, and the outlet temperature was set at 48°C. The bar soap was extruded into a rod shape with a diameter of 2011 mm and was molded into a bar soap in the same manner as in Example 1. The residence time in the twin-screw kneading extruder was about 15 minutes.

Example 4 In a twin-screw kneading extruder B shown in Fig. 6.7, paddles 14 having a trough length of 660 fi and a substantially triangular shaft cross section with a paddle diameter of 50 m are installed on both rotating shafts 13a and 13b sequentially from the tip side. A total of 32 helical paddles (14blB and 14flat paddles 14a) are arranged and fixed on each axis with a phase difference of 60 degrees, making a pair of the same phase between both shafts 13a and 13b. While rotating both rotating shafts 13a and 13b synchronously in the same direction at a rotational speed of 150 rpm, the following transparent soap composition was added from the hopper 11b: beef tallow fatty acid sl-IJum soap 58 parts sodium coconut oil fatty acid Soap 14 parts rosin
4 part glycerin
2 parts sucrose 3 parts propylene glycol 2 parts EDTA
0.05 part water
Total remaining 1
00 parts (1.500 g) was added, the extrusion port 11a was removed, and the mixture was kneaded twice to obtain a chip-like product. In addition,
The outlet temperature was 55°C, and the residence time per run was about 25 minutes.

Tsuki t,=, This chip-shaped kneaded material was passed through an extruder (screw: diameter 801, length 4001111, cone: outlet diameter 20, length 1
After extrusion at an outlet temperature of 46° C. using a 50° C., the mixture was molded into a bar of soap in the same manner as in Example 1.

Comparative Example The same transparent soap composition as used in Example 1 was kneaded twice at 30°C using the same three rolls as in Example 3.
Furthermore, the conventional extruder used in Example 4 was used with the cone section removed, and the mixture was kneaded four times.The cone section was then attached again and extruded into a rod shape with a diameter of 20 mm. A bar soap was molded in the same manner as in Example 1.

The temperature at the exit of the extruder was set at 50° C., and the residence time in the extruder was about 5 minutes per batch.

Using these bar soaps, we conducted the following transparency test.
Performance evaluation as a transparent soap was conducted.

Transparency test〉 Using a stamped bar of soap, place the soap on top of a black cross drawn on a piece of white paper with a width of 5 cm and a length of 15 cranes. Those that could not be identified but were recognized to have letters were rated Δ, and those for which it was not obvious that there were any letters were graded ×. The results are shown in the table below.

As is clear from the above table, this invention method (Examples 1 to 4)
) Twin-screw kneading extruder A with a specific kneading zone
It can be seen that the transparent soap kneaded using B and B has extremely excellent transparency, but the transparent soap produced by the comparative example method using an ordinary kneading extruder has poor transparency.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view showing an example of a twin-screw kneading extruder used in the present invention, Fig. 2 is a cross-sectional plan view of the same, and Fig. 3 is a cross-sectional view taken along line mm in Fig. 2. , FIGS. 4(a) to 4(d) are schematic sectional views sequentially showing the kneading operation of the same extruder, FIGS. 5(a) and (b) are perspective views of paddles used in the same extruder, FIG. 6 is a longitudinal sectional side view showing another example of the twin-screw kneading extruder used in the present invention, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIGS. C) is a schematic cross-sectional view sequentially showing the kneading operation of the same extruder as above, FIG. 9(a), (bl
is a perspective view of a paddle used in the same extruder. A, B... Twin-screw kneading extruder, 3a, 3b... Rotating shaft, 4... Paddle with convex lens-shaped shaft cross section, 13a. 13b... Rotating shaft, 14... Paddle with approximately triangular shaft cross section Fig. 1 Fig. 12 Fig. 5 (a) (b) Fig. 7 Fig. 4

Claims (2)

[Claims] (1) A large number of paddles with a convex lens cross section that form a pair with a phase difference of 90 degrees between two axes, or a number of paddles with a substantially triangular cross section that form a pair with the same phase between two axes are fixed to each axis. was done 2
A method for producing transparent soap, which comprises kneading a soap composition containing a clarifying agent using an axial kneading extruder, and then molding the extruded kneaded product into a desired shape. (2) The method for producing transparent soap according to claim (1), wherein the two shafts of a twin-screw kneading extruder are rotated in the same direction for kneading.