JPS62228000A - High density granular detergent composition - 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 Field of the Invention The present invention relates to dense granular detergent compositions with improved dispersion solubility in cold water.

C. Prior Art] In recent years, there has been an increasing demand for high-density powder detergents from the viewpoint of resource conservation, transportation of detergents, and convenience for housewives in carrying and storing detergents.

However, high-density powder detergents do not yet have a practically satisfactory dissolution rate, and research has been conducted to improve them. For example, in JP-A No. 60-96698, detergent components such as surfactants and virgoo are intimately mixed in a kneader or the like, then crushed and granulated, and then water-insoluble fine particles with an average primary particle size of 10 μm or less are mixed. A method for making a dense powder detergent with improved cold water solubility by powder coating is disclosed.

[Problem that the invention seeks to solve]

However, it has been found that conventional high-density detergents do not maintain sufficient solubility in fully automatic washing machines that have become popular in recent years.

In other words, in the case of a normal fully automatic washing machine, the washing cycle begins by pouring water by first adding laundry and detergent and then turning on the start switch.
When a group of detergent particles is slowly immersed in water without being subjected to much physical force, hydration and dissolution begin from the particle surface as water penetrates into the group of detergent particles. At the stage when the particle surface is hydrated, a paste-like layer containing a very high concentration of detergent ingredients and water is formed on the particle surface, and the particles coalesce at that point, making the entire particle group hydrated. It is covered with a paste-like layer, and together with the solidification due to hydration of the inorganic builder, it becomes one large lump, which cannot be redispersed by the mechanical force of subsequent stirring, and cannot be completely dissolved within the normal washing time. Sometimes this happens,
This was highly undesirable for consumers.

Such a case is particularly likely to occur when the detergent particles have a wide particle size distribution and contain many fine particles. This is because if the particle size distribution is wide and there are a lot of fine powders, the fluidity and dispersibility of the powder will be poor, and the powder will tend to be put in blocks during washing, and it will tend to get lumpy when put in. In addition, the fine powder will quickly hydrate in water, and the binder will This is because the particles come together.

Moreover, such a phenomenon is particularly likely to occur when the detergent composition contains a specific amount of anionic surfactant.

[Means for solving problems]

In this way, the present inventors have discovered that when a group of detergent particles is slowly immersed in water without much mechanical agitation, it is possible to prevent the association, coalescence, or caking of detergent particles. As a result of intensive studies aimed at improving solubility, it was discovered that the hydrophilic-hydrophobic balance on the surface of detergent particles is extremely important, and the present invention was completed.

That is, in the present invention, the surface of the high-density granular detergent fabric is prepared using (a) aluminosilicate fine powder (hydrophilic) and (fa due to bl hydrophobic fine powder)/(b) = 3/1 to 1/3.
The present invention provides a high-density granular detergent composition in which the detergent fabric is coated with (al + (b)) in a range of (weight ratio) from 1 to 5%.

The present invention will be explained in more detail below.

Examples of the aluminosilicate 1a) used in the present invention include A-type zeolite, which is generally used in detergents, X-type zeolite, Y-type zeolite, etc. However, no matter what kind of aluminosilicate is used, - It is desirable to use fine particles having an average particle diameter of 10 μm or less.

Further, the hydrophobic fine powder (b) used in the present invention is not particularly limited as long as it is hydrophobic, but those that have stronger water repellency and do not significantly impede cleaning performance are preferred.
Naturally desirable. Furthermore, the smaller the particle size of the hydrophobic fine powder is, the better the coating effect can be achieved with a smaller amount; specifically, it is preferably 10 μm or less.

Specific examples of the hydrophobic fine powder suitably used in the present invention include the following fine powders.

(11 Higher alcohol with an average carbon number of 16 to 22 (2) Saturated fatty acid with an average carbon number of 16 to 22 (3) Average carbon number of 16
~22 alkaline earth metal salts of saturated fatty acids (4) Water-repellent silica produced by a dry process (organic solvent treatment) (5) Inorganic fine powder surface-treated with a hydrophobic organic substance The weight ratio of salt fine powder and (bl hydrophobic fine powder) is (al/(b)=3/1~
Use within 1/3 of the range to cover the surface of the high-density granular detergent fabric. Outside this range, it will not be possible to obtain a high-density granular detergent that satisfies the dispersion and solubility under severe conditions such as in the fully automatic washing machine described above. The total amount of coating agents (a) and (b) is:
A suitable amount is 1 to 5% by weight based on the detergent fabric. The method of JP-A No. 60-96698 treats many coating agents as a single concept of water-insoluble fine powder, and does not teach the combined use of coating agents with different functions as in the present invention. do not have. In the present invention, hydrophilic fine powder alone cannot prevent detergent particles from associating with each other, and hydrophilic fine powder other than aluminosilicate, for example,
Inorganic powders such as silicon dioxide and calcium carbonate have no effect when used in combination with hydrophobic fine powders, and it is clear that while hydrophobic fine powders alone can prevent particles from collaborating, the solubility of the detergent particles themselves deteriorates. Became.

Dense granular detergent fabrics are comprised of commonly used detergent ingredients. For example, alkylbenzene sulfonates, alkyl ether GA M salts, alkyl sulfates, olefin sulfonates, alkanesulfonates, higher fatty acid salts, carboxy or sulfobetaine type surfactants,
Surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, higher fatty acid alkanolamide, tripolyphosphate, nitrilotriacetate, ethylenediaminetetraacetate, polyacrylate, polyacetal carboxylate (Japanese Patent Application Laid-Open No. 1989-1983) −
No. 52196), divalent metal ion scavengers such as citrate and aluminosilicate, alkaline agents or inorganic electrolytes such as sodium silicate, soda carbonate, and sodium sulfate, recontamination preventive agents such as polyethylene glycol and carboxymethyl cellulose, and percarbonate. Bleach such as soda, soda percarbonate,
These include enzymes such as protease, amylase, lipase, and cellulase, and fluorescent dyes.

The manufacturing method and coating method for the high-density granular detergent fabric are not particularly limited. The present invention recommends a method in which aluminosilicate fine powder and hydrophobic fine powder are added to the high-density granular detergent dough obtained by crushing and granulating until it reaches a density, and then mixed with a powerful mixer. be done. A part of the water or nonionic surfactant, which is an ingredient in detergent dough, can be added as a granulation aid during disintegration and granulation, and a small amount of thermally unstable additives, such as enzymes and bleach, can also be added as a granulation aid. Some of the inorganic building blocks that do not require drying, such as sodium carbonate, sodium sulfate, and aluminosilicates, may be added in a step after spray drying. In addition, when aluminosilicate is added during crushing and granulation, and the surface of the resulting high-density granular detergent fabric is covered with aluminosilicate, only the hydrophobic fine powder is added during the coating process. That's fine.

The particle size of the high-density detergent fabric is preferably such that it does not substantially contain coarse particles of 1500 μm or more, and the content of fine particles of 125 μm or less is 3% by weight or less (preferably 2% by weight or less). 150
Primary particles larger than 0μ have a negative effect on the dissolution rate, and fine particles smaller than 125μ deteriorate the fluidity of the particles and tend to become lumpy when added to water, inhibiting the dispersibility of primary particles in water. Because it does.

The present invention can be applied to high-density detergents of all compositions, but particularly in high-density granular detergents containing 25 to 50% by weight of anionic surfactants, hydrophobic fine powder and aluminosilicate fine powder are used. The effect of improving the dispersion of detergent particles in water achieved by coating the surface of the detergent particles when used in combination is remarkable. That is, when high-density detergent particles containing the above-mentioned specific amount of anionic surfactant are hydrated on the surface, they tend to form a viscous paste-like or gel-like layer, and this layer allows the particles to bond together. Particles tend to associate and coalesce, resulting in poor solubility, but according to the present invention, particles can be prevented from associating and coalescing, and good dispersion and solubility can be obtained.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to examples, but the present invention is not limited by the following examples.

Example 1 A slurry with the following composition (solid content: 60% by weight) was prepared, spray-dried to obtain detergent powder, and then crushed and granulated using a high-speed mixer (stirring transfer granulator) to obtain a bulk density of 0.8.
0g/cc, 0% by weight of coarse particles of 1500μ or more, 125
A high-density granular detergent fabric having a particle size distribution with a micron fines content of 1% by weight was obtained.

Detergent composition (note) AS: Alkyl sodium sulfate (014-C35) AOS
: Sodium α-olefin sulfonate (CI6~C+a) Numbers are % by weight, the same below.Next, 100 parts by weight of the obtained high-density granular detergent fabric and 3 parts by weight of various coating agents were mixed in a Henschel mixer (high-speed stirring mixer). Mixed.

The results obtained are shown in Table-1. The detergent dispersion solubility was measured as follows.

Measurement of detergent dispersion solubility■Hitachi fully automatic washing machine 2.8kg Aozora PF-2650
Using a washing machine, place 40g of detergent in one place at one end of the bottom of the washing tub, and add clothes (60 parts by weight of cotton underwear and polyester/
Pour 2 kg of cotton blend dress shirt (40 parts by weight) onto the detergent, and pour 10°C tap water at a flow rate of 81 per minute to avoid direct contact with the detergent.407! Pour water slowly over 5 minutes until the Thereafter, stirring is started, and after 3 minutes and 5 minutes of stirring, stirring is stopped, water is drained, and detergent remaining in the clothes and washing tub after 3 minutes of dehydration is visually determined. The judgment criteria are shown below.

○: No residual detergent ◎: Slightly small particles of residual detergent △: Many small particles of residual detergent or a few lumps of residual detergent ×: Considerable lumps of residual detergent In this measurement method, the detergent particle population is During the 5 minutes when water is poured, it is not subjected to any physical mechanical force, but after the water permeates and is exposed to water, it is subjected to mechanical force due to stirring.

Claims (1)

[Claims] 1. A high-density granular detergent composition coated with the following fine powders (a) and (b). (a) Aluminosilicate fine powder (b) Hydrophobic fine powder However, (a)/(b) is 3/1 to 1/3 in weight ratio, (a
)+(b) is 1 to 5% by weight based on the detergent fabric. 2. The high-density granular detergent composition according to claim 1, wherein the hydrophobic fine powder is one or more selected from the group consisting of (1) to (4) below. (1) Higher alcohol with an average carbon number of 16-22 (2) Saturated fatty acid or its alkaline earth metal salt with an average carbon number of 16-22 (3) Water-repellent silica (4) Inorganic fine powder surface-treated with a hydrophobic organic substance Body 3 The detergent particles do not substantially contain coarse particles with a particle size of 1500 μm or more, and the content of fine powder with a particle size of 125 μm or less is 3% by weight.
A high-density granular detergent composition according to claim 1, which is as follows.