JP2531522B2 - High bulk density granular detergent composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a high bulk density granular detergent composition which is excellent in lathering, rinsing property and solubility.

2. Description of the Related Art Conventionally, granular detergents which have been made into beaded hollow particles by spray drying have been mainly used. However, since spray-drying detergent has a low bulk density of about 0.3 g / cc, it has problems in terms of transportation cost, storage space, etc., and the development of a high-bulk density detergent that can be concentrated and washed with a small amount of detergent has been developed. Has been done.

On the other hand, a sulfonate of a saturated fatty acid lower alkyl ester is also called an α-sulfofatty acid ester salt and is a surfactant excellent in detergency, especially hard water resistance, and a high bulk density detergent composition containing this is also available. Reported (JP-A-62
-599 publication). However, when this surfactant is blended into a high bulk density detergent composition having a bulk density of 0.5 to 1.2 g / cc, the solubility is deteriorated, the rinsability is poor, and the foaming is poor.

When a nonionic surfactant is added to improve this drawback, the solubility and rinsability are improved, but foaming is significantly deteriorated.

Also, in order to improve the solubility, it was proposed to add an unsaturated fatty acid sulfonate (Japanese Patent Application No. 61-41844),
In this case also, the foaming deteriorates.

OBJECT OF THE INVENTION It is an object of the present invention to provide a high bulk density granular detergent composition having good solubility, foaming property and rinsability.

Composition of the Invention The high bulk density granular detergent composition of the present invention has a bulk density of 0.5 to 1.2 g / cc and contains the following components (a), (b) and (c), (a), (B) Total amount of components (a) + (b)
Is 20 to 60% by weight, and the mixing ratio [(a) + (b)] / (c) of each component is in the range of 15/1 to 1/1 by weight.
The bulk density is 0.5 to 1.2 g / cc.

(A) Sulfonate of saturated fatty acid lower alkyl ester having 8 to 22 carbon atoms in fatty acid residue: 2 to 30% by weight.

(B) Anionic surfactant other than the above component (a): 2 to 30
weight%.

(C) Alcohol ethoxylate having a carbon chain length of 8 to 22 and an average addition mole number of ethylene oxide of 10 to 30: 2 to 15% by weight.

 Hereinafter, the present invention will be described in more detail.

The sulfonate of the saturated fatty acid lower alkyl ester as the component (a) is typically represented by the following general formula (I).

(R ^1: C ₆ to ₂₀ alkyl group R ^2: lower alkyl group having about C ₁ ~ ₃ M: counter ion) Among this, the number of carbon atoms in the fatty acid residue 12~22 (R ^1: C _{10
To 20} ) are preferable, and the counter ion is preferably an alkali metal, especially a sodium salt.

The sulfonic acid salt of a saturated fatty acid lower alkyl ester as the component (a) is obtained by converting a fatty acid having 8 to 22 carbon atoms into a lower alkyl ester, and then reacting it with sulfuric anhydride using an ordinary sulfonation apparatus, and aging if necessary. It is obtained by bleaching and then neutralizing. It can also be obtained by converting a sulfonated product of saturated fatty acid into a lower alkyl ester.

As the raw material fatty acid, a fatty acid of a predetermined carbon number derived from animals and plants derived from beef tallow, coconut oil, palm oil and the like, and a synthetic resin acid are used.

The sulfonate of the saturated fatty acid lower alkyl ester as the component (a) tends to be a di-salt compound represented by the following general formula (II) when the ester bond is cleaved by hydrolysis. This di-salt compound is used in the detergent composition of the present invention in an amount of 30% by weight based on the sulfonate of a saturated fatty acid lower alkyl ester.
The following may be contained, preferably 10% by weight.

(R ¹ : alkyl group M: counter ion) As the anionic surfactant of the component (b), for example, the following are used.

* Linear alkyl benzene sulfonate: preferably,
A sodium salt having an alkyl group having 9 to 14 carbon atoms.

* Alkyl sulfate: A sodium salt having preferably 9 to 15 carbon atoms.

* Α-olefin sulfonate: preferably 12 carbon atoms
~ 20 sodium salts.

* Polyoxyethylene alkyl ether sulfate (AE
S): Preferably, a sodium salt of AES obtained by adding 1 to 5 mol of ethylene oxide on average to a saturated or unsaturated alcohol having 9 to 15 carbon atoms.

The alcohol ethoxylate as the component (c) has 8 carbon atoms.
.About.22 primary or secondary alcohol to which ethylene oxide is added on average of 10 to 30 mol, preferably 12 to 25 mol.

The high bulk density detergent composition of the present invention has the following (a),
It is necessary to include the components (b) and (c) in specific amounts and specific ratios.

(A): 2 to 30% by weight, preferably 8 to 20% by weight (b): 2 to 30% by weight, preferably 2 to 20% by weight (a) + (b): 20 to 60% by weight, preferably 20 to 45% by weight (c): 2 to 15% by weight, preferably 2 to 10% by weight [(a) + (b)] / (c) [weight ratio]: 15/1 to 1/1, preferably 10/1 to 1/1% by weight If the total amount of the components (a) and (b) is less than 20% by weight, sufficient detergency cannot be obtained, while if it exceeds 60% by weight, production becomes difficult.

Even if the total amount of (a) + (b) is within the above range,
When the amount of the component (a) is less than 2% by weight, the excellent surface activity of the sulfonate of a saturated fatty acid lower alkyl ester cannot be fully utilized. Also, (a)
When the compounding amount of the component exceeds 30% by weight or the compounding amount of the component (b) deviates from the range of 2 to 30% by weight, good solubility,
A composition having both foaming property and rinsing property cannot be realized.

Further, if the content of the component (c) is less than 2% by weight or [(a) + (b)] / (c) exceeds 15/1, the solubility is remarkably poor and the rinsability is also low. to degrade.

In addition, the blending amount of the component (c) exceeds 15% by weight,
When [(a) + (b)] / (c) is less than 1/1, the foamability during cleaning is significantly deteriorated.

The high-bulk-density granular detergent composition of the present invention may contain optional components such as other surfactants and builders, in addition to the above-mentioned essential components, if necessary.

As the builder, zeolite represented by the following general formula (II) is suitable, and its particle size is preferably 5 μm or less.

(M ₂ O) x ・ (Al ₂ O ₃ ) ・ (SiO ₂ ) y ・ (H ₂ O) z …… (II) (M: Na or K x: 0.7 to 1.5 y: 0.8 to 6 z: 0 Or an integer) Such a zeolite traps calcium ions and magnesium ions, which are hardness components in the washing liquid by its ion exchange capacity, and contributes to the improvement of detergency, and also has an effect on physical properties of powder and prevention of caking during storage. Exert.

Further, as a water-soluble builder, sodium tripolyphosphate, phosphates such as sodium pyrophosphate, trisodium nitrilotriacetate (NTA), trisodium citrate, organic chelate builders such as sodium ethylenediaminetetraacetate, polyacetal carboxylate,
Polymeric builders such as acrylic acid (hydroquinoacrylic acid) polymers, acrylic-methacrylic acid copolymers, maleic anhydride-oleic acid copolymers, alkali builders such as sodium carbonate, sodium silicate, sodium borate, etc. Is preferably used. These builders have the ability to capture calcium and magnesium ions,
Alternatively, it has an alkaline buffering ability, and it is desirable to incorporate it into a granular heavy detergent.

Further, nonionic surfactants such as alkylphenol ethoxylates and fatty acid alkanolamides, recontamination inhibitors such as polyethylene glycol and carboxymethyl cellulose, reducing agents such as sodium bisulfite and sodium sulfite, enzymes such as alkaline protease, amylase, cellulase and lipase. , A fluorescent whitening agent, mirabilite, and a fragrance can be added.

The detergent composition of the present invention has a bulk density obtained by granulating the above components.
The composition has a high bulk density of 0.5 to 1.2 g / cc. As this granulation method, as described in the above-mentioned JP-A-62-597, each detergent raw material such as α-sulfo fatty acid ester salt is kneaded with a kneader and mixed, and a cutter mill type etc. It is obtained by crushing and granulating with a crusher and further mixing with water-insoluble fine powder. It is also possible to spray-dry the detergent components in advance and knead and mix the spray-dried product with a nonionic surfactant or further other detergent components to produce a high bulk density granular detergent composition.

EFFECTS OF THE INVENTION According to the present invention, a sulfonate of a saturated fatty acid lower alkyl ester is combined with an anionic surfactant of a linear alkylbenzene sulfonate, and a specific alcohol ethoxylate is further used in combination. A high bulk density granular detergent composition satisfying all of solubility, foaming property and rinsing property can be obtained by using the compounding amount and the compounding ratio in a specific amount.

Therefore, even a high-bulk-density granular detergent dissolves quickly, exhibits sufficient foaming during washing, and quickly defoams during rinsing.

Hereinafter, the present invention will be described in more detail with reference to Examples.
Prior to this, the evaluation method used in the examples is shown below.

(1) Foaming and defoaming property A 10 wt% benzene solution of organic fouling containing the following fouling components was uniformly applied to a cotton skin shirt so that the weight of the fiber was 0.1 wt%, and after air-drying, evaluation was performed under the following conditions. It was Dirt component Dirt composition (wt%) Oleic acid 45 Triolein 25 Cholesterol oleate 19.5 Liquid paraffin 4 Squalene 4 Cholesterol 2.5 Evaluation method In a washing machine (spiral type, reversing type), 0.
A 14% tap water solution was prepared. Using the above-mentioned soiled cotton shirt as the cloth to be washed, it was washed at a bath ratio of 1:30 at 25 ° C. for 10 minutes according to a normal operation, and the foam height after the washing was measured with a graduated test tube. There were four measurement points, and the average value was taken as the foaming of the detergent composition.

Further, after the washing was completed, the cloth to be washed was dehydrated for 1 minute, rinsed with running water containing no detergent composition (15 l / min), and the time required until the bubbles disappeared was measured, and the bubbles were broken.

(2) Solubility Put water 1 at 25 ° C in a beaker and insert a cell for measuring conductivity into it. Then, 1 g of each granular detergent composition having the composition shown in Table 1 was added to water, and a constant speed stirrer was used.
The mixture was stirred at a speed of 250 rpm, and the time taken for 90% of the added detergent particles to dissolve was measured to obtain the solubility T ₉₀ (seconds). Here, as the conductivity meter, HORIBA CONDUCTTVE METER DS-8F
The mold was used.

Example A spray-dried product containing the components shown in Table 1 below, excluding a part of water and the nonionic surfactant, was produced.

This spray-dried product, the nonionic surfactant and water were introduced into a continuous kneader to obtain a dense and uniform kneaded product. The kneaded product was made into a cylindrical pellet by an extruder and then crushed and granulated to obtain a high bulk density granular detergent composition having an average particle size of 550 μm and a bulk density of 0.75 g / cc.

About the obtained cleaning composition, foamability during cleaning,
The foam breakability and solubility during rinsing were evaluated, and the results are shown in Table 1.

Claims (1)

(57) [Claims] 1. A sulfonic acid salt of a saturated fatty acid lower alkyl ester having 8 to 22 carbon atoms in a fatty acid residue: 2 to 30% by weight, (b) an anionic surfactant other than the component (a): 2 ~ 30
%, And (c) an alcohol ethoxylate having a carbon chain length of 8 to 22 and an average addition mole number of ethylene oxide of 10 to 30: 2 to 15% by weight, and the total amount of the (a) component and the (b) component. (A) +
(B) is 20 to 60% by weight, and the weight ratio is [(a) +
(B)] / (c) is in the range of 15/1 to 1/1, and the bulk density is
A high bulk density granular detergent composition, which is 0.5 to 1.2 g / cc.