JPH10306296A - Granular defoaming composition and granular detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a deforming composition for clothes that exhibits sufficient defoaming effect even at relatively low washing temperature and is resistant to the deterioration of the defoaming effect during the washing by using a silicon defoaming agent and a carrier substance. SOLUTION: The deforming composition contains (A) a silicone defoaming agent, (B) a carrier substance, (C) a polyethylene glycol with an average molecular weight of 1,000-30,000 and (D) a polyethylene oxide with an average molecular weight of 100,000-5,000,000. In an embodiment, a polyorganosiloxane is used as the component A in an amount of 3-35 wt.%, natural starch or a processed starch is used as the component B in an amount of 5-80 wt.%, and the amount of the component C is 10-80 wt.% and the component D is 0.2-20 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a particulate antifoaming composition and a granular detergent composition particularly suitable for a granular detergent composition for clothing.

[0002]

2. Description of the Related Art In the past, in Japan, it has been required that a detergent for clothing be foamed appropriately during washing. This is because there was a perception in washing habits that moderately foaming had a detergent detergency. However, with the recent spread of fully automatic washing machines,
After the detergent and clothing are put into the washing machine, no operation is required until the washing is completed. This has changed washing consciousness, and rather, a detergent having a low foaming property and a good rinsing property has been demanded so that rinsing can be surely completed within a program time.

[0003] Also, fully-automatic washing and drying machines that are automated from washing to drying are gradually spreading due to the sophistication and diversification of consumer life. This type includes a drum type washing machine, which is currently mainly used in European countries. The drum type washing machine is different from the conventional pulsator type washing machine in that the washing is performed by tapping and washing. Therefore, if foaming occurs during washing, the washing efficiency is reduced, and the washing performance is reduced. Further, there is a problem that when the foaming becomes severe, the foam overflows from the washing machine. Further, a drum-type washing machine is very poor in bubble elimination during rinsing as compared with a pulsator-type washing machine. Therefore, a detergent with reduced foaming has been demanded.

[0004] As an antifoaming agent that suppresses foaming during washing and rinsing (hereinafter collectively referred to as washing), a silicone antifoaming agent is well known. However, when the silicone antifoaming agent is added to and mixed with other detergent components in a granular form (hereinafter, the granular form includes a powdery form),
Although the defoaming effect immediately after the addition is very good, there is a problem that when stored for a long period of time, it is denatured and the defoaming performance is reduced. For this reason, when a silicone antifoaming agent is used, the silicone antifoaming agent is generally granulated with a binder or the like, or the silicone antifoaming agent is subjected to a coating treatment such as encapsulation in a capsule to form a granular material. Mixing with other detergent ingredients has been performed. However, even if such a treatment is performed, if the granular material is stored in another detergent component for a long period of time, the silicone antifoaming agent may exude and the defoaming performance may be reduced. At this time, the higher the storage condition is, the more the defoaming performance decreases. In particular, when the silicone antifoaming agent exudes and comes into contact with an alkali agent contained in other detergent components, the defoaming performance is significantly reduced.

As a solution to this problem, a particulate antifoaming composition has been proposed in which a silicone antifoaming agent is included in the organic substance by, for example, carrying the silicone antifoaming agent on the organic substance to improve the preservability thereof. ing. More specifically,
JP-A-2-27496 discloses a particulate antifoaming composition containing a water-insoluble fatty acid or fatty alcohol.
No. 97 proposes a particulate antifoaming composition containing a fatty acid and a glycerol monoester, and JP-A-63-56600 proposes a particulate antifoaming composition containing a fatty acid and a soap.

However, in the above-mentioned granular antifoaming composition, when washing is performed under relatively low temperature conditions, the silicone antifoaming agent is hardly released into water, and the antifoaming effect may be insufficient. That is, in Europe and the like where the water temperature at the time of washing is high, the silicone antifoaming agent is released into the water and exhibits an antifoaming effect. However, in a case of ordinary tap water (for example, about 5 to 30 ° C.) as in Japan, Under the washing conditions, the silicone antifoaming agent is not released into the water while being taken in by the organic substance, and the defoaming effect cannot be obtained, or it takes a long time to be released, and the quick defoaming effect is obtained. There may not be. If the defoaming effect is not obtained within the programmed washing and rinsing time, it is necessary to set a longer washing time, which lowers washing efficiency and economy. In addition, the fluidity (powder properties) of the particles of the particulate antifoaming composition and the dispersibility in water are not sufficient, and the operability when blending (powder mixing) with other detergent components is reduced, There is a problem that it is difficult to disperse uniformly in water during washing.

More recently, besides improving the storage stability, the fluidity of the particulate defoamer composition, the release of the silicone defoamer in water during washing, and the uniform dispersion of the particulate defoamer composition The following proposals have been made for the purpose of improving performance and the like. JP-A-8-173789 discloses a liquid antifoaming composition containing a silicone antifoaming agent and finely divided silica. In addition, Japanese Patent Publication No. Hei 6-508
No. 173 and JP-A-4-298202 disclose a particulate antifoaming composition in which a silicone antifoaming agent is supported on a water-soluble supporting substance such as zeolite, sodium sulfate and light soda ash. Further, for the purpose of improving the storage stability under high temperature conditions, Japanese Patent Application Laid-Open No.
No. 00, silicone antifoam, natural starch,
A particulate antifoam composition comprising a water-insoluble fatty acid or fatty alcohol or fatty acid and a monoester of glycerol is disclosed.

Although various proposals have been made in this way,
There is a need for a defoaming agent that exhibits a defoaming effect under relatively low temperature washing conditions at ordinary tap water temperature as in Japan and that satisfies the long-term storage stability of the defoaming effect.

Further, when a silicone antifoaming agent is mixed with another detergent component such as a surfactant to form a detergent composition, the defoaming effect is high immediately after the detergent composition is added to water, but the defoaming effect is low. There is a problem that it does not last. Particularly, in the washing condition of the drum type washing machine, a small amount of water is used, and the washing time is 20 to 30.
Since it is longer than a minute, it is required to maintain the defoaming effect at the time of washing, and it is also desired to have a good rinsing property. In recent years, compact detergents have become the mainstream, and the amount of detergent used in one wash has been reduced, so that the amount of detergent spooned by consumers has a significant effect on foaming during washing. . For this reason, when the amount of the detergent is relatively large, the defoaming effect after adding the detergent composition to water is remarkably reduced.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in view of a ship, and has as its object to solve the following problems. In other words, a sufficient defoaming effect is exhibited even when washing is performed under relatively low temperature conditions such as tap water as in Japan, and a granular defoaming agent composition whose defoaming effect is hardly reduced during washing. A particulate detergent composition is provided. Furthermore, the present invention provides a particulate defoamer composition and a granular detergent composition having stable defoaming effects and long-lasting defoaming effects even after long-term storage. In particular, it is preferable that storage stability be obtained even when the storage temperature is high. Furthermore, the present invention provides a particulate defoamer composition and a particulate detergent composition which have good fluidity (powder properties) and dispersibility in water and which properties are not easily reduced even after long-term storage, especially in a high-temperature storage environment. .

[0011]

According to a first aspect of the present invention, there is provided a silicone antifoaming agent, a carrier material, and an average molecular weight of 1
Polyethylene glycol (hereinafter P)
EG), and polyethylene oxide having an average molecular weight of 100,000 to 5,000,000 (hereinafter abbreviated as PEO). A second invention is a granular detergent composition comprising the granular antifoaming composition of the first invention.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The silicone contained in the silicone antifoaming agent used in the present invention is not particularly limited, but a typical example is a polyorganosiloxane represented by the following general formula I: Used.

[0013]

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As the silicone defoaming agent, silicone alone can be used. However, in addition to silicone, a compound type containing filler particles such as hydrophobic silica, alumina and TiO ₂ , an emulsion type containing an emulsifier, and a polyorgano It is also possible to use a self-emulsifying type silicone defoaming agent obtained by modifying siloxane with polyalkylene glycol amine, oil or fat. When a component other than silicone is thus contained, the proportion of silicone in the silicone antifoaming agent is usually at least 10% by weight, substantially 12 to 99% by weight.

In the present invention, a compound type silicone antifoaming agent containing a polyorganosiloxane and filler particles has good operability in the production of a granular antifoaming composition and is evenly dispersed in the granular antifoaming composition. This is easy and the defoaming effect is high, which is preferable. The blending amount of the silicone antifoaming agent with respect to the total amount of the particulate antifoaming composition is 3 to 35% by weight, preferably 5 to 30% by weight. If the amount is less than 3% by weight, the effect of the silicone antifoaming agent cannot be obtained. If the amount is more than 35% by weight, the silicone may exude and storage stability may decrease.

As the carrier substance, generally known substances can be used as long as they are water-soluble or water-dispersible solid particles. By selecting and blending those having such properties, the storage stability can be maintained without lowering the low-temperature solubility of the granular antifoam composition. In addition, handling during the production of the granular antifoam composition, fluidity (powder characteristics) of the granular antifoam composition, and dispersibility of the granular antifoam composition in water can be improved. Specific preferred examples include natural starch, modified starch, zeolite, clay, talc, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate, and carboxymethyl cellulose salt. These may be used alone or in combination of two or more.
The compounding amount of the carrier substance is 5 to the total amount of the particulate antifoaming composition.
It is 80% by weight, preferably 10 to 75% by weight. 5
When the amount is less than the weight percentage, the low-temperature solubility of the particulate antifoaming composition may decrease, and the defoaming effect may not be obtained. If it exceeds 80% by weight, the storage stability may decrease.

PEG mainly functions as an organic binder substance. That is, by blending PEG, it is easy to obtain a granular material having an appropriate particle size when granulating the granular antifoaming composition, and the shape can be stably maintained. PEG has an average molecular weight of 1000
To 30,000, preferably 1500 to 20,000. This is because if it is less than 1000, the storage stability of the particulate antifoam composition may decrease, and if it exceeds 30,000, the low-temperature solubility of the particulate antifoam composition may decrease. PEG is present in the particulate antifoam composition at 10%.
-80% by weight, preferably 10-70% by weight. If the amount is less than 10% by weight, the effect of addition cannot be obtained, and the amount of fine powder may increase during granulation of the granular antifoaming composition. 8
If the content exceeds 0% by weight, the amount of other essential components may be reduced, and the fluidity of the granular antifoam composition may decrease.

PEO has a molecular weight of several hundred thousand to several million obtained by polymerizing ethylene oxide. PEO and PEG have the same basic structure, but those with relatively low molecular weight are called PEG and those with high molecular weight are called PEO. PEO
For example, a white powder having fluidity at room temperature (15 to 25 ° C.) can be suitably used. The PEO used in the present invention has an average molecular weight of 100,000 to 5,000,000, preferably 100,000 to 3,000,000. If it is less than 100,000, the defoaming effect may be difficult to maintain during washing (when poured into water). If it exceeds 5,000,000, the low-temperature solubility may decrease. The main effect of blending PEO is that the sustainability of the defoaming effect can be improved without lowering the low-temperature solubility. The amount of PEO is 0.2 to 20% by weight, preferably 0.5 to 15% by weight. If the amount is less than 0.2% by weight, the sustained defoaming effect may not be obtained. If the amount exceeds 20% by weight, the low-temperature solubility of the granular antifoam composition may decrease.

In the granular antifoam composition of the present invention, essential components are a silicone antifoam, a carrier material, PEG,
It is PEO, and by containing these, while exhibiting the defoaming effect even under low temperature conditions such as tap water, the durability of the defoaming effect after being put into water is obtained, and even after long-term storage, these defoaming effects are obtained. The effect is not easily reduced. This storage stability can be obtained even when the storage temperature is as high as, for example, about 30 ° C. or more, so that it can be used in a storage environment in summer.

Further, in addition to the above essential components,
It is preferable to add an anionic surfactant and / or a nonionic surfactant. By blending an anionic surfactant and / or a nonionic surfactant, the solubility of the particulate antifoaming agent composition in low-temperature water is improved, and the durability of the defoaming effect after being added to water is improved. Further improve. Examples of the anionic surfactant include the following. (A) Linear alkylbenzene sulfonate having an alkyl group having an average of 8 to 16 carbon atoms (B) α-olefin sulfonate having an average of 10 to 22 carbon atoms (C) α-sulfofatty acid ester salt (alkyl derived from fatty acid) Group or alkenyl group has 10 to 20 carbon atoms, and the alkyl group or alkenyl group of the ester moiety has 1 carbon atom.
~ 4. )

(D) Alkyl sulfonate having an alkyl group having an average of 10 to 20 carbon atoms The counter ion of these anionic surfactants is an alkali metal, an alkaline earth metal, a substituted or unsubstituted ammonium group or the like. Although examples can be given, alkali metals such as sodium and potassium are generally preferred.

Examples of the nonionic surfactant include the following. (A) a primary or secondary alcohol having 8 to 18 carbon atoms,
EO (ethylene oxide) -added alkyl (or alkenyl) ether having an average of 4 to 50 moles added thereto. (B) E is added to a primary or secondary alcohol having 8 to 18 carbon atoms.
O is 4 to 25 mol on average, PO (propylene oxide)
EO-PO type alkyl (or alkenyl) ether having an average of 3 to 15 moles added thereto (c) An ester type nonionic (d) obtained by adding an average of 4 to 25 moles of EO to a lower alkyl ester of a fatty acid having 6 to 20 carbon atoms ) Polyoxyethylene sorbitan fatty acid esters,
Polyoxyethylene sorbite fatty acid ester (e) Polyoxyethylene hydrogenated castor oil ester (f) Glycerin fatty acid ester (g) Consisting of fatty acid having 6 to 18 carbon atoms and monosaccharide having 5 to 6 carbon atoms or monoalkyl ether and ester thereof Sugar ester non-ion (h) Sugar alkyl ether non-ion

The compounding amount of the anionic surfactant and / or the nonionic surfactant in the particulate antifoaming composition is from 0.1 to 0.1%.
It is 15% by weight, preferably 0.2 to 10% by weight.
If it is less than 0.1%, the effect of addition may not be obtained, and the effect of improving low-temperature solubility may not be obtained. If the amount exceeds 15% by weight, the durability of the defoaming effect may be reduced.

In addition, other optional components can be added to the granular antifoaming composition as long as the defoaming effect of the silicone antifoaming agent is not reduced. However, it is preferable not to add an agent such as an alkali agent, which reduces the defoaming effect when it comes into direct contact with the silicone antifoaming agent. Specifically, for example, an inorganic builder such as zeolite or white carbon, or a water-soluble polymer such as carboxymethyl cellulose salt can be blended. Further, fragrances, dyes, and the like can be added.

The granulation method of the particulate antifoaming composition is not particularly limited, and a generally known granulation method,
For example, any of stirring granulation, kneading / extrusion granulation, and fluidized bed granulation can be used. Preferably, a silicone antifoaming agent, a carrier substance, PEG, PEO, and an anionic surfactant are mixed as required to form a mixed powder, and the mixed powder is further mixed with a nonionic surfactant as necessary. And then kneading the mixture under a temperature condition equal to or higher than the melting point of PEG and granulating it through steps such as extrusion molding and crushing, or adding a nonionic surfactant to the mixed powder as necessary. Then, a method of stirring and granulating using a stirring mixer (high-speed mixer) under a temperature condition not lower than the melting point of PEG can be used. The average particle size of the granular antifoam composition is 100 to 2000 μm, preferably 150 to 1500 μm. If it is less than 100 μm, the fluidity may decrease,
If the amount exceeds the above, the solubility may decrease.

The granular antifoam composition of the present invention comprises a silicone antifoam, a carrier substance, and an average molecular weight of 1,000 to 3,000.
Since PEG of 0 and PEO having an average molecular weight of 100,000 to 5,000,000 are essential constituents, it is approximately equivalent to tap water (for example, 5 to 3).
The defoaming effect can be obtained even at a low temperature of 0 ° C.), and the defoaming effect can be maintained after being put into water. Therefore, it can be suitably used for a drum-type washing machine or the like having a long washing time. Then, even after long-term storage, these characteristics are hardly deteriorated, and particularly, even when stored under high-temperature conditions, these characteristics are hardly deteriorated. Therefore, it is possible to cope with a summer storage environment. Further, it has relatively good fluidity (powder properties) and dispersibility in water, and hardly deteriorates in fluidity (powder properties) and dispersibility in water even after storage under high-temperature conditions.

Further, a granular detergent composition containing the above-described granular antifoaming composition can be obtained. The amount of the granular antifoaming composition is 0.1 to 15 with respect to the total amount of the granular detergent composition.
% By weight, preferably 0.2 to 10% by weight. 0.
If the amount is less than 1% by weight, a sufficient defoaming effect cannot be obtained, and
If the amount is more than 10% by weight, the amount of other components is reduced, and the defoaming effect is saturated.

In the granular detergent composition, other detergent components other than the granular antifoam composition include surfactants, inorganic builders, and other optional components. As the surfactant, an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, or a mixture thereof can be used. Among these, it is particularly preferable to use an anionic surfactant since the particulate antifoaming composition of the present invention effectively exerts the defoaming effect on the highly foaming anionic surfactant. Examples of the anionic surfactant include linear alkylbenzene sulfonates, alkyl sulfates, α-olefin sulfonates, α-sulfofatty acid ester salts, and the like.
In particular, a high defoaming effect is obtained by the particulate antifoaming composition α
-Sulfo fatty acid ester salts are preferred.

As the inorganic builder, for example, sodium silicate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium sesquicarbonate, sodium sulfite and the like can be used. A type, X
A type or amorphous synthetic zeolite can also be used. As other optional components, an organic builder such as a maleic acid-acrylic acid copolymer, an enzyme, a softener, a bleaching agent, a bleaching activator, a fragrance, and the like can also be blended. The average particle size of the granular detergent composition is 300 to 3000 μm, preferably 350 to 2000 μm. If it is less than 300 μm, problems may occur in fluidity, cloth adhesion, and the like,
If it exceeds 3000 μm, the solubility may decrease.

The method of blending the particulate antifoaming composition is not particularly limited, but a method is generally used in which the main components of other detergent components are mixed with dry powder or high bulk density particles by a conventional method. Is preferred.

As described above, by incorporating the particulate antifoaming composition of the present invention into the granular detergent composition, a sufficient defoaming effect can be exhibited even under relatively low temperature washing conditions such as the temperature of tap water. Thus, it is possible to obtain a stable granular detergent composition that can maintain the defoaming effect after being put into water and that does not easily reduce these effects even after long-term storage, especially after long-term storage at a high temperature. That is, since a sufficient defoaming effect can be obtained within the program time of washing and rinsing, both washing efficiency and economic efficiency in washing can be satisfied. Also,
Since the granular antifoaming composition has relatively good fluidity, it is evenly dispersed in the granular detergent composition when mixed with other detergent components, and furthermore has good dispersibility in water, so that uniform defoaming is achieved. The effect is obtained. These characteristics are hardly deteriorated even after storage under high temperature conditions. In particular, the granular antifoaming composition of the present invention is an anionic surfactant which is difficult to use as a detergent component for a drum-type washing machine due to good foaming, despite its high washing ability at a relatively low temperature. The defoaming effect is sufficiently exhibited. Therefore, when the granular antifoaming composition is used together with the anionic surfactant in constituting the granular detergent composition, the high cleaning ability of the anionic surfactant is maintained, the foaming is reduced, and the long-term storage stability is improved. A very good granular detergent composition is obtained.

The embodiments of the present invention are summarized as follows. (1) The silicone contained in the silicone antifoaming agent is preferably a polyorganosiloxane represented by the above general formula I. Examples of the silicone antifoaming agent include, in addition to silicone, hydrophobic silica, alumina, TiO2 and the like. Compound types containing filler particles are preferred. Therefore, a compound type silicone antifoaming agent containing polyorganosiloxane as silicone is most preferred. (2) The compounding amount of the silicone antifoaming agent to the total amount of the particulate antifoaming composition is 3 to 35% by weight, preferably 5 to 30% by weight.
It is said.

(3) The carrier substance is a water-soluble or water-dispersible solid particle, such as natural starch, modified starch, zeolite, clay, talc, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate, carboxymethyl cellulose salt and the like. Examples can be given. These may be used alone or in combination of two or more. The amount of the carrier substance is 5 to 80% by weight, preferably 10 to 75% by weight, based on the total amount of the particulate antifoaming composition.

(4) PEG has an average molecular weight of 1000 to 30
000, preferably 1500 to 20,000. PEG is blended in the particulate antifoam composition at 10 to 80% by weight, preferably 10 to 70% by weight.

(5) PEO has an average molecular weight of 100,000 to 500
10,000, preferably 100,000 to 3,000,000. PEO
0.2-20% by weight, preferably 0.5-15%
% By weight.

(6) When an anionic surfactant and / or a nonionic surfactant are added to the granular antifoaming composition in addition to the essential constituents, the granular antifoaming composition can be treated with respect to low-temperature water. The solubility is further improved, and the defoaming durability after being added to water is further improved. The amount of the anionic surfactant and / or the nonionic surfactant in the granular antifoam composition is 0.1 to 15% by weight, preferably 0.2 to 15% by weight.
It is 10% by weight.

(7) When a granular detergent composition containing the granular antifoaming composition is prepared, the amount of the granular antifoaming composition is 0.1 to 15% by weight based on the total amount of the granular detergent composition. %,
Preferably it is 0.2 to 10% by weight. (8) As the surfactant to be added to the granular detergent composition, it is preferable to use an anionic surfactant since the action of the granular antifoaming composition is effectively exerted. As the anionic surfactant, an α-sulfofatty acid ester salt, which can provide a high defoaming effect by the particulate antifoaming composition, is particularly suitable.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. << Experimental Example >> A granular antifoaming composition and a granular detergent composition were produced as described below, and their performance was evaluated.

<Preparation of granular antifoaming composition> [Sample Nos. 1 to 6] Each of the components shown in Table 1 was added to a KRC kneader (manufactured by Kurimoto Ironworks Co., Ltd.), and the temperature was 65 ° C. Kneading, then extrusion molding machine (Fuji Paudal Co., Ltd.)
Made into a cylindrical pellet of about 10 mmφ × 20 mm.
Then, the columnar pellet is crushed and granulated using a speed mill (manufactured by Okada Seiko Co., Ltd.) equipped with a screen having a mesh size of 2 mm, and further sieved to 24 to 60 mesh, and the granular pellet having an average particle size of 550 μm is eliminated. A foam composition was obtained.

[Sample Nos. 7 to 11] Each of the components shown in Tables 1 and 2 was put into an Extruded Omics EM-6 type (manufactured by Hosokawa Micron Corporation) equipped with a 1.0 mmφ die, and the jacket temperature was set to 75. Kneading and granulation at ℃, 1.
0mmφ diameter noodles, cut and cut into average length 2
A columnar pellet of 0 to 50 mm was obtained. The columnar pellet was crushed and granulated using a speed mill (manufactured by Okada Seiko Co., Ltd.) equipped with a screen having a mesh size of 2 mm, and then further crushed and granulated.
~ 60 mesh, average particle size 550μ
m of a granular antifoam composition was obtained.

<Preparation of High Bulk Density Detergent Particles Containing Other Detergent Components> High bulk density detergent particles composed of other detergent components having the compositions shown in Table 3 were prepared by the following method. First, a slurry having a water content of about 50% containing anionic surfactant such as sodium α-sulfofatty acid methyl ester, soap, zeolite, alkali builder, fluorescent agent, etc. is prepared at about 70 ° C., and is subjected to countercurrent spraying. Hot air temperature 2 using a drying tower
Spray dried at 50 ° C. A nonionic surfactant and water were added to the obtained dry powder, and the mixture was compacted and kneaded with a kneader, followed by crushing and granulation with a Fitzmill (manufactured by Hosokawa Micron Corporation, Model DKA-3) to obtain an average particle size of 550 μm. High bulk density detergent particles were obtained.

<Preparation of Granular Detergent Composition> The granular defoamer compositions of Sample Nos. 1 to 10 shown in Tables 1 and 2 were added to 100 parts by weight of the high bulk density particles composed of the other detergent components. 5
The parts by weight were each mixed with powder to obtain a granular detergent composition (the granular defoamer composition was 1.% based on the total amount of the granular detergent composition).
48% by weight). Further, 0.1 part by weight of the granular defoamer composition of Sample No. 6 and 17 parts by weight of the particulate defoamer composition of Sample No. 4 were added to 100 parts by weight of the high bulk density particles composed of the other detergent components. 0.5 parts by weight of powder was mixed to obtain a granular detergent composition (Sample Nos. 12 and 13: 0.1% by weight of the particulate antifoaming composition, and 14.
9% by weight).

<Evaluation of Defoaming Effect and Its Persistence and Rinse Property> A drum-type washing machine (Sharp Corporation) in which 20 g of the granular detergent composition immediately after preparation was filled with 15 L of tap water at 30 ° C.
And stirred for 1 minute. Then, 1 kg of a cotton shirt was added and washed with stirring for 20 minutes. After the washing, the cotton shirt was dehydrated for 3 minutes, placed in a washing tub filled with 15 L of tap water, and rinsed for 5 minutes. The cotton shirt was dehydrated again for 3 minutes and rinsed again under the same conditions. 3 after rinsing
The residual amount of the foam after 0 seconds was determined based on the following criteria. In addition, the foam height at each time was measured during the washing with stirring, and the durability of the defoaming effect was evaluated. The results are shown in Tables 1 and 2.

(Rinse Evaluation Criteria) Rank A: The liquid surface is almost completely transparent and almost no bubbles remain. B rank: The liquid surface has many transparent parts, but bubbles of about 1 mm remain slightly. Rank C: 60% or more of the liquid surface is covered with bubbles of about 1 mm. Rank D: The liquid surface is almost entirely covered with bubbles of about 1 mm, and large bubbles of several mm remain.

<Storage stability test>
The above-mentioned rinsability evaluation was performed about what was stored at 40 degreeC and 40 days. The results are shown in Tables 1 and 2. Table 1, Table 2
From the results shown in the above, in the embodiment according to the present invention,
It was confirmed that the defoaming effect at the time of washing was high in persistence, and the storage stability and the persistence of the defoaming effect were good even when stored at a high temperature.

[0046]

[Table 1]

[0047]

[Table 2]

[0048]

[Table 3]

[0049]

As described above, the particulate antifoaming composition of the present invention comprises a silicone antifoaming agent, a carrier substance, polyethylene glycol having an average molecular weight of 1,000 to 30,000,
Since polyethylene oxide having an average molecular weight of 100,000 to 5,000,000 is used as an essential component, the defoaming effect can be obtained even at a low temperature condition such as tap water, and the defoaming effect is maintained after being put into water. . Therefore, it can be suitably used for a drum-type washing machine or the like having a long washing time. Then, even after long-term storage, these characteristics are hardly deteriorated, and particularly, even when stored under high-temperature conditions, these characteristics are hardly deteriorated. Therefore, it is possible to cope with a summer storage environment. . Furthermore, the fluidity (powder properties) and the dispersibility in water are relatively good. For example, the fluidity (powder properties) and the dispersibility in water are reduced even after storage under a high temperature condition of 30 ° C. or more. It is difficult to do.

Further, by incorporating the granular antifoaming composition of the present invention into a granular detergent composition, sufficient defoaming and defoaming effects can be obtained even under relatively low temperature washing conditions such as tap water. , And a granular detergent composition having a defoaming effect and a long-term storage stability of the durability even when stored under high-temperature conditions. That is, since a sufficient defoaming effect can be obtained within the program time of washing and rinsing, both washing efficiency and economic efficiency in washing can be satisfied. In addition, since the granular antifoam composition has relatively good fluidity, it is uniformly dispersed in the granular detergent composition when mixed with other detergent components, and further has good dispersibility in water, so that uniform A defoaming effect is obtained. These characteristics are hardly deteriorated even after storage under high temperature conditions.
In particular, the granular antifoaming composition of the present invention is an anionic surfactant which is difficult to use as a detergent component for a drum-type washing machine due to good foaming, despite its high washing ability at a relatively low temperature. The defoaming effect is sufficiently exhibited.
Therefore, in constituting the granular detergent composition, if the granular antifoaming composition is used together with the anionic surfactant,
Maintains high washing ability of anionic surfactant, and has less foaming even for long washing time like drum type washing machine,
A very excellent granular detergent composition whose properties are maintained even after long-term storage under high-temperature conditions is obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C11D 3:37)

Claims (2)

[Claims] 1. A granular antifoaming composition comprising a silicone antifoaming agent, a carrier substance, polyethylene glycol having an average molecular weight of 1,000 to 30,000, and polyethylene oxide having an average molecular weight of 100,000 to 5,000,000. 2. A granular detergent composition comprising the particulate antifoaming composition according to claim 1.