JPH01172500A - Manufacture of high-density granular soap - Google Patents

Abstract

PURPOSE:To obtain a high-density granular soap which is easy to handle and has excellent solubility in water, etc., by spray drying a soap slurry containing a surface active agent consisting mainly of a fatty acid soap, grinding the dried soap, and re-granulating the ground soap in the presence of a water-soluble inorganic builder. CONSTITUTION:A surface active agent containing at least 70wt.% fatty acid soap (e.g., a sodium salt of coconut oil fatty acid) is mixed with a builder (e.g., soda ash) and water to produce a soap slurry. This slurry is spray-dried to give a granular soap, which is ground. The ground soap is re-granulated in the presence of a water-soluble inorganic builder (e.g., sodium silicate or sodium carbonate) to give a granular soap having a density higher than that of the original grain. The high-density granular soap thus obtained has excellent handleability etc. in carrying and excellent detergency with a small amount, and is superior in solubility in water to a soap granulated without spray drying.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing high-density granular soap, and more particularly to a granular soap containing 70% by weight or more of fatty acid soap in the surfactant component. , highly soluble in water,
This invention relates to a method for producing high-density granular soap that has excellent washing effects in small amounts.

[Conventional technology]

BACKGROUND ART Conventionally, granular (or powder) soaps and granular (or powder) synthetic detergents produced by spray drying have been widely used for household anti-coating applications because of their good solubility and ease of handling.

However, conventional granular soaps and granular synthetic detergents have a bulk density (hereinafter simply referred to as density) of 0.2 to 0.4.
i/- and relatively low density, high tension and product transportation (
There was a problem that it was inconvenient to carry. For this reason, in recent years, granular soaps and granular synthetic detergents with higher density have been developed.As a method for producing high-density granular soaps and granular synthetic detergents, for example, horizontal mixed fabrication with wings of a specific structure is used. Method of disintegrating, mixing, and granulating fatty acid soap, synthetic surfactant, and builder into a granulator (Japanese Unexamined Patent Publication No. 62-86099), spraying of detergent containing surfactant and builder A method of granulating a dried product in the presence of a surface modifier such as aluminosilicate, silicon dioxide, talc, clay, metal soap, etc. (Japanese Patent Application Laid-open No. 61-6479
Publication No. 8) etc. have been proposed.

[Problem that the invention seeks to solve]

However, the former method involves crushing soap in the form of needles, flakes, or blocks before granulating it, which takes time to crush the soap, resulting in poor manufacturing efficiency and being unsuitable for mass production. However, the resulting granular soap has the disadvantage of poor solubility in water. In addition, aluminosilicates, silicon dioxide, talc, clay, metal soaps, etc. used as surface modifiers in the latter method are water-insoluble;
For this reason, in the case of synthetic detergents that tend to cause caking due to moisture absorption, it is necessary to use such a surface modifier to prevent moisture absorption, but since the surface modifier is insoluble, K.
There is a problem in that the surface modifier adheres to clothes etc. after washing and contaminates the clothes etc.

[Means for solving problems]

As a result of intensive research in view of the above points, the present inventors have found that the spray-dried slurry containing 70% by weight or more of fatty acid soap in the surfactant component is pulverized and recycled in the presence of a water-soluble inorganic builder. Because of granulation, it has a higher density and is less bulky than conventional granular soaps, making it easier to handle, and a sufficient anti-layer effect can be obtained with a small amount, and surprisingly, compared to conventional granular soaps. The present inventors have discovered that granular soap with excellent water solubility can be efficiently produced using the same method, and have completed the present invention.

That is, the present invention involves spray-drying a soap slurry containing 70% or more of fatty acid soap in the surfactant component, then crushing the granular soap obtained by spray-drying, and re-forming it in the presence of a water-soluble inorganic builder. The gist of the present invention is a method for producing high-density granular soap, which is characterized by granulating the soap into granular soap having a density higher than that of the original particles.

In the present invention, soap slurry refers to fatty acid soap containing 70%
It includes a mixture whose main components are a surfactant and a builder containing % by weight or more, and further contains water, and a case where only a fatty acid soap is used as the surfactant. As fatty acid soap, the alkyl group and/or alkenyl group has 7 to 2 carbon atoms.
Sodium salts, potassium salts, etc. of about 1% fatty acid are used.

Examples of the fatty acids mentioned above include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, caproleic acid, laurolenic acid, oleic acid, linoleic acid, lilunic acid, arachidonic powder, coconut oil, and palm kernel oil. , fatty acids of animal and vegetable oils such as soybean oil, lard, and beef tallow, or fatty acids of hydrogenated oils such as hydrogenated oils of these animal and vegetable oils and hydrogenated fish oils, as well as fatty acids of transesterified oils and fractionated oils of the animal and vegetable oils mentioned above. It will be done. It is necessary that these fatty acids account for 70% by weight or more in the surfactant component.

Examples of surfactants other than soap include anionic surfactants such as linear alkyl sulfate salts, α-olefin sulfonates, higher alcohol ethoxysulfate salts, and alkyl sulfonates, polyoxyalkylene alkyl ethers, and polyoxyalkylene alkyls. Nonionic surfactants such as phenyl ether, polyoxyalkylene fatty acid ether, and fatty acid alkylolamide, or amphoteric surfactants such as alkyl betaine type, amino acid type, and sulfobetaine type are used.

Examples of the builder, which is the other component constituting the soap slurry, include sodium carbonate (soda ash), sodium sesquicarbonate, sodium silicate, sodium sulfate, sodium tripolyphosphate, sodium metaphosphate, aluminosilicate, and the like. In addition, if necessary, metal ion scavengers such as EDTA, dirt dispersants such as polyethylene glycol, etc.
It is also possible to add a re-staining prevention agent such as OMO, a coloring agent, a fluorescent dye, etc.

In the present invention, the slurry is first spray-dried (
(Hereinafter, the granular soap obtained by spray drying with is referred to as primary particles). In order to perform spray drying efficiently, the water content in the slurry is preferably 25 to 50% by weight. The ratio of surfactant to builder in the slurry is preferably 1:0 to 1:4 (surfactant:builder) by weight. The density of the obtained primary particles is usually about 02 to 0.4 ji/-.

It is preferable that the particles be spray-dried so that the water content is 5 to 15% by weight.

Next, the above-mentioned secondary particles are crushed and re-granulated in the presence of a water-soluble inorganic builder (hereinafter, the granular soap obtained by re-granulation with is referred to as secondary particles). Particularly preferred are sodium silicate, sodium carbonate, sodium sulfate, sodium tripolyphosphate, and sodium metaphosphate, and these can be used alone or in combination of two or more. The amount of water-soluble inorganic builder added is preferably 1 to 20 parts by weight, particularly preferably 5 to 15 parts by weight, per 100 parts by weight of the primary particles. - For crushing and re-granulating the secondary particles, a machine such as an isbeed mixer, a Henschel mixer, a vertical mixer, a vertical granulator, etc., and various crushers and granulators can be used as necessary in the re-granulating process. A metal ion scavenger such as BDTA, fragrance, etc. may also be added. Also, if the water content in the secondary particles is slightly less than the above range, water may be added at the time of re-granulation. Polyvinyl alcohol (PVA), carboxymethyl cellulose (O
Other binders such as MO) can also be added, but
These binders may be added to the slurry in advance. The amount of these binders added is 100 secondary particles.
It is preferable to add it in an amount of 0.5 to 5 parts by weight per part by weight. Granular soap (secondary particles) having a higher density than the primary particles can be obtained by regranulation, and the density of the secondary particles is usually 0.5 to 09y/-.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Examples 1 to 7 Spray drying slurry having the composition shown in Table 1 (hot air temperature 150~
200° C.) to obtain primary particles having the density and average particle size shown in Table 2. Next, the primary particles were pulverized for 2 to 3 minutes using a Noisbead mixer (manufactured by Fukae Kogyo, model FS-GSIO), and then a water-soluble inorganic builder shown in Table 2 was added to 100 parts by weight of the particles. and granulated for 4-6 minutes. still,
Regarding Examples 1 and 2, 2 parts by weight of water was added during granulation. Table 2 shows the properties of the obtained secondary particles. Table 2 also shows the results of a water solubility test and a washing test of the obtained secondary particles under the following conditions.

Water solubility test After putting 30 tons of tap water into a washing machine with a capacity of 5at and bringing it to 25℃, 40g of the sample (soap) was added while stirring, and 1
The washing liquid was scooped up with a beaker every 5 seconds, and the time until insoluble particles were no longer observed was measured.

Washing test 330 to JI8 using 40g of tap water in 301
Tested based on 3.5.7.

Moreover, a turbotometer was used as a stirring type tester.

Comparative Example 1 After pulverizing the primary particles obtained in the same manner as in Example 1 using the same bead mixer as in Example 1 under the same conditions, -
Re-granulation was carried out under the same conditions as in Example 1 by adding 10 parts by weight of aluminosilicate per 100 parts by weight of the secondary particles. Table 2 shows the properties of the obtained secondary particles. Table 2 shows the results of a water solubility test and a washing test using the secondary particles under the same conditions as in the examples.

Comparative Example 2 A commercially available granular soap (composite soap) manufactured by extrusion, pulverization, and re-granulation was used to conduct the same water solubility test and washing test as above. The results are shown in Table 2. show.

〔Effect of the invention〕

As explained above, the method of the present invention involves pulverizing primary particles obtained by spray-drying a soap slurry containing 70% by weight or more of fatty acid soap in the surfactant component, and reproducing the particles in the presence of a water-soluble inorganic builder. By adopting the granulation method, it has a higher density than the original particle density, and is easier to handle during transportation than conventional particles. Density granular soap can be produced efficiently,
It also has excellent mass productivity. In addition, since the method of the present invention uses a soap slurry containing 70:1iii% or more of fatty acid soap in the surfactant component, it is difficult to use a synthetic detergent containing a large amount of synthetic surfactant other than soap in the surfactant component. In the case of re-granulation, there is less risk of caking due to moisture absorption even if the particle surface is not coated with an insoluble aluminosilicate, etc., so it is pressed without using an insoluble aluminosilicate, etc., and as a result, The granular soap obtained by the present invention not only has no risk of reducing its solubility in water, but also has an even better water solubility than conventional granular soaps granulated without spray drying. It has various effects such as excellent washability.

Claims (2)

[Claims] (1) Spray-dry a soap slurry containing 70% by weight or more of fatty acid soap in the surfactant component, then crush the granular soap obtained by spray-drying and re-granulate it in the presence of a water-soluble inorganic builder. A method for producing high-density granular soap, characterized in that the granular soap has a density higher than that of the original particles. (2) The water-soluble inorganic builder is sodium silicate, sodium carbonate, sodium sulfate, sodium tripolyphosphate,
The method for producing a high-density granular soap according to claim 1, wherein the soap is one or more selected from the group consisting of sodium metaphosphate.