JPS59160524A - Continuous atomizing method of cationic surface active agent - Google Patents

Abstract

PURPOSE:To shear and atomize a cationic surface active agent by providing a valve which forms a very narrow slit by water pressure in a piping in which water flows and supplying continuously the cationec surface active agent from a nozzle provided in porximity on the upper stream side of the valve into the water. CONSTITUTION:A valve 6 which forms a very narrow slit by water pressure is disposed in a piping 1 in which water flows, and a cationic surface active agent is continuously supplied from a nozzle 2 provided in proximity on the upper stream side of said valve 6 into the water. More specifically, the cationic surface active agent is supplied in the position near the slit valve and therefore the cationic surface active agent contacts or mixes with the water prior to a dispersion treatment and forms a liquid crystal structure, by which the formation of viscous liquid is avoided as far as possible and since the uniform shearing is made possible by the valve 6, the atomized material having the grain size distribution smaller than that by a stirring blade is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining uniform fine particles by continuously supplying a cationic surfactant into water.

In general, cationic surfactants have excellent softening effects on clothing;
Among these, dioctadecyldimethylammonium chloride, which is a quaternary ammonium salt, and dimethylammonium chloride, which contains dioctadecyldimethylammonium chloride as a main component, are particularly widely used as fabric softeners. In addition to these quaternary ammonium salts, cationic surfactants such as 7-os, 7-onium salts represented by % and amide/amine salts represented by the general formula % are also known to have excellent softening effects. .

These surfactants have hydrophobic long-chain alkyl groups, so they have excellent adsorption to clothing;
Due to their nature, many of these surfactants are poorly soluble in water, so in order to make them easier to use as softeners, most of these surfactants are dispersed in water and further added as anti-gelling agents. The viscosity is adjusted to 50 to 300 cpi by adding nonionic surfactants, organic salts, inorganic salts, etc., and alcohols as low temperature stability improvers.

The softening effect of cationic surfactants on clothing is proportional to the amount of surfactant adsorbed onto clothing, and the amount of cationic surfactant adsorbed onto clothing depends on its particle size. It can be concluded that the smaller the number, the more particles, and therefore the finer particles are better in the softening effect.

Moreover, in that case, if the particle size of the cationic surfactant is fine and uniform, the adsorption amount will further increase and the softening effect will be even higher.

However, as mentioned above, many cationic surfactants are poorly soluble in water, and when a cationic surfactant comes into contact with water, its surface becomes a liquid crystal structure, increasing its viscosity and becoming viscous. liquid and null, atomization becomes extremely difficult.

In order to solve these problems, various techniques have been proposed in the past. For example, JP-A-57-579
No. 7 and JP-A No. 57-102226, the cationic surfactant is atomized by supplying it near the stirring blade. However, in this method, the cationic surfactant is dispersed using rotating blades, which causes a distribution of shear force depending on the position of the blade, making uniform dispersion difficult and making it difficult to atomize particles with a uniform viscosity distribution. . Therefore, in order to obtain the desired softening effect, it is necessary to increase the amount of cationic surfactant added.

In order to solve these problems, as a result of further intensive research, the present invention improves the atomization using a conventional rotary tool that has a distribution of shear force as the mechanism of the atomization part, and uses a valve to improve the atomization mechanism. The present invention was completed by discovering a method of atomization that can provide a more uniform shearing force.

That is, in the present invention, a valve that forms a minute slit using water pressure is installed in a pipe through which water flows, and a cationic surfactant is continuously applied into the water from a nozzle installed close to the upstream side of the valve. It is characterized in that it is supplied and sheared and atomized by the above-mentioned valve.

Hereinafter, the method of the present invention will be explained in more detail with reference to the drawings.

Figure 1 shows an example of a dispersion device for carrying out the present invention, in which water that has been heated to a dispersion temperature in advance by a heat exchanger (not shown) or the like is distributed in the direction of arrow A. In the pipe 1, a supply port 3 of a nozzle 2 for supplying a cationic surfactant is opened toward downstream, and the cationic surfactant is continuously supplied to the water flowing in the pipe 1 through the supply port 3. supply to.

A stationary mixer 4 consisting of a valve seat 5 and a slit valve 6 having a trapezoidal seal portion 6α is disposed downstream of and close to the cationic surfactant supply port 3. The mixer 4 is constructed by arranging a slit valve 6 on the downstream side of a valve seat 5 and interposing a spring 8 between the slit valve 6 and a spring seat 7 to bias it in the valve closing direction. The slit valve 6 is automatically opened by water pressure to open a minute slit between it and the valve seat 5, and the cationic surfactant added to the water opens the slit valve 6 automatically due to the water pressure. When passing through the slit, the particles are sheared due to rapid speed changes and collisions, and are uniformly atomized, and the resulting dispersion aqueous solution flows out to the outlet 9.

ζ Now, to explain the preferred conditions of the present invention, the distance between the supply port 3 and the slit valve 6 is determined by the time from when the cationic surfactant comes into contact with water until it is dispersed by the slits, and Although it is controlled by the degree of mixing caused by the turbulence of the flow between them, it is usually 100 times or less the diameter d of the valve seat 5 (well, preferably 50 d or less, particularly preferably 30 d-0.1 d). On the other hand, the opening pressure of the slit valve 6 is preferably set to 2 kIVm2 or more, preferably 10 kt/aLz to 600 kV.
cIL2 range.

As described above, in the method of the present invention, since the cationic surfactant is supplied at a position close to the slit valve, the cationic surfactant comes into contact with or mixes with water to form a liquid crystal structure before the dispersion treatment. It is possible to avoid becoming a very viscous liquid as much as possible, and the slit valve allows for uniform shearing, so it is possible to obtain an atomized product with a smaller particle size distribution than when dispersing with stirring blades. As a result, the softening effect on clothing can be improved even with a smaller amount than conventional ones.

2 and 3 respectively show examples of different structures of the slit valve 6. In FIG. 2, a conical seal portion 6 is shown.
In FIG. 3, a flat plate-shaped slit valve 6 is used.

Next, examples of the present invention will be described.

[Example 1] In the apparatus shown in FIG. 1, a static mixer 4 (I) y) valve 6 (d: 10
mm), the supply port 3 of the nozzle 2 is opened, and polyoxyethylene alkyl phenyl ether (0.5%), which is an anti-gelling agent, and ethylene glycol (5%), which is a low-temperature stabilizer, are added in advance. The opening pressure of the slit valve was set to 10 kV.
15 k17. each in a static mixer set at ILz.
The cationic surfactant dispersion was supplied continuously at a pressure of 2° C. to obtain a cationic surfactant dispersion at a rate of 5001 qP/hour. Thereafter, the dispersion was allowed to stand, and the particle size distribution was measured using a particle size distribution measuring device at a temperature of 30° C. The results are shown by the solid line in FIG.

In addition, in the apparatus shown in FIG. 1, a propeller-type stirring blade 10 as shown in FIG.
By rotating the propeller-type stirring blade 10 at ooo rotation, the cationic surfactant dispersion at 52°C is heated at 500 rpm.
obtained at the rate of kt. The particle size distribution of this dispersion was also measured under the same conditions as in the above example, and the results are shown in FIG. 5 by dotted lines.

As is clear from these results, it was confirmed that the particle size distribution of the fine particles obtained using the static mixer was more uniform than that obtained using the propeller type stirring blade.

[Example 2] In the apparatus shown in FIG.
), the supply port 3 of the nozzle 2 was opened at a distance of 0.25 d, and polyoxyethylene alkyl phenyl ether (O, S%) as a gelling inhibitor and ethylene glycol (5%) as a low-temperature stabilizer were added in advance. The opening pressure of the slit valve 6 is 20%.
251qI each in 4 static mixers set at kVm2
was continuously supplied at a pressure of /IL2, and obtained at a ratio of . Thereafter, the dispersion was left to stand, and the particle size distribution was measured using a particle size distribution measuring device at a temperature of 25° C. The results are shown in FIG. In this case, as in Example 1, a uniform particle size distribution was obtained.

[Example 6] In the same apparatus as in Example 1, only the concentration of dimethylammonium chloride was changed to 4.5% and 4%, and the flexibility effect was compared to that obtained with a propeller-type stirring blade. As a result of comparison 11, the 4.5% dimethylammonium chloride dimethylammonium chloride obtained with the static mixer was the same as Prope 2.
The 5% dimethylammonium chloride dimethylammonium chloride obtained with a type stirring blade exhibited exactly the same flexibility as b.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the apparatus used in the first embodiment of the present invention, Figs. 2 and 6 are sectional views of different structures of a static mixer, and Figs. 5 and 6 are explanations showing experimental results. It is a diagram. 1.0 piping, 2... nozzle, 60. slit valve. Patent applicant Lion Corporation Day 1 Figure 2 Figure 30 Figure 5 Figure Z and Figure 6

Claims (1)

[Claims] 1. A valve that forms a minute slit using water pressure is installed in a pipe through which water flows, and a cationic surfactant is continuously supplied into the water from a nozzle installed close to the upstream side of the valve. A method for continuous atomization of a cationic surfactant, characterized by carrying out shear atomization using the above-mentioned valve.