JPH0645797B2 - Method for producing high bulk density detergent composition containing bleaching agent - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bleaching agent-containing high bulk density detergent composition having a sufficient bleaching effect and preventing undesired discoloration / discoloration of a colored portion such as cloth.

A bleaching detergent containing a conventional bleaching agent can be used to wash sebum stains and bleach stain stains such as coffee and tea at the same time.
It is easy to use.

Persulfates and hydrogen persulfates have been known as bleaching agents to be added to such detergents. However, while persulfate and hydrogen persulfate have higher bleaching power than other oxygen-based bleaches such as percarbonate and perborate, they are locally applied to dyed fabrics. There is a high risk of discoloration and discoloration, and in particular, persulfuric acid (hydrogen) salt and the alkaline component of the detergent component are likely to be dissolved in a high concentration.

Since persulfate (hydrogen) salt is easily decomposed by water and heat, it is inappropriate to add it to the detergent slurry, spray-dry it, and blend it into the granular detergent. Therefore, conventionally, the powder was blended with the detergent particles by powder blending. However, since the detergent for textiles is a highly alkaline heavy detergent, a state in which persulfate (hydrogen) salt and alkali are locally dissolved at a high concentration during washing causes a large amount of persulfate (hydrogen). ) It was easy for the salt to decompose rapidly, causing discoloration and fading of the colored fabric.

As a method for preventing discoloration of the woven fabric, a method of coating the bleach particles with a multilayer coating (capsule) to prevent discoloration has been proposed (JP-A-53-26782), which is a solution of the bleach in water. Is intended to be delayed relative to the detergent and is essentially different from the present invention.

OBJECT OF THE INVENTION The present invention contains a bleaching agent in which a persulfate or hydrogen persulfate having an excellent bleaching power is stably blended to have a good bleaching effect, and moreover, discoloration or fading of a colored wash is prevented. The present invention provides a method for producing a high bulk density detergent composition.

Composition of the invention The method for producing a bleach-containing high bulk density detergent composition of the present invention comprises:
Average particle size 15 consisting mainly of persulfate or hydrogen persulfate
A bleaching component of 0 μm or less and a detergent component are uniformly mixed and kneaded into a solid detergent in a state where the detergent component does not substantially contain free water, and the solid detergent is crushed into solid particles. It is characterized by The granular detergent composition thus obtained, unlike the one obtained by the spray drying method, has substantially no hollow portion and has a high bulk density of 0.5 to 1.2 g / cc.

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

Usual surfactants, chelating agents, alkali builders, and other additives can be used as the detergent component.

As the surfactant, a linear alkylbenzene sulfonate, an alpha olefin sulfonate, an alkyl ether sulfate, an alkyl sulfate, an anion surfactant such as α-sulfo fatty acid ester salt (sodium, potassium, etc. as the salt), Examples include nonionic surfactants.

Examples of the chelating agent include zeolite, citrate, nitrilotriacetic acid salt and the like. Examples of the alkali builder include carbonates, bicarbonates, silicates (preferably Na ₂ O / SiO ₂ = 1 / 2.5 to 2.5 / 1), borate, and the like, and salts include sodium salts, Examples include potassium salts. Other additives include fluorescent agents, redeposition inhibitors,
Enzymes, colorants and the like can be mentioned.

As these detergent components, various forms such as a spray dried product or a neutralized main product obtained by neutralizing linear alkylbenzene sulfonic acid with concentrated potassium hydroxide or sodium hydroxide can be used. It is necessary to set the free water content to substantially 0% prior to mixing with. Here, the free water is a portion excluding the crystal water and the bound water of each detergent component at the temperature at the time of kneading with the bleaching component. For example, as in the case where a linear alkylbenzene sulfonic acid is neutralized with concentrated alkali to form a part of a detergent component, water produced by the neutralization is present and free water exceeds 0% in the detergent base material. At this time, prior to the addition and mixing of the bleaching agent component, other builders and the like are added to consume the water of crystallization and the generated water as bound water, thereby reducing the free water content to substantially zero.
%.

As the bleaching agent component, at least one of persulfate and hydrogen persulfate is used, and examples of the salt include sodium salt and potassium salt. A typical example of such a bleaching agent component is Oxone (trade name, manufactured by DuPont; 2K ₂ SO ₅
It is commercially available as KHSO ₄ · K ₂ SO ₄ ).

The bleach component has an average particle size of 150 μm or less, preferably 100 μm
m or less, more preferably 70 μm or less, as fine particles, which are uniformly mixed and kneaded with the detergent component. If the particle size of the bleaching agent component is large, even if it is mixed with the detergent component to form a granular detergent, it is not possible to sufficiently prevent the localized high concentration state at the time of dissolution, and the risk of discoloration or discoloration of colored clothing Will become bigger.

In order to obtain a sufficient bleaching effect, the persulfate or hydrogen persulfate is preferably added in the high bulk density granular detergent composition in an amount of 1% by weight or more, more preferably 2% by weight or more. Further, if the blending amount is too large, the absolute amount of persulfate (hydrogen) salt present on the surface of the granular detergent tends to increase, and discoloration or fading tends to occur. Therefore, it is preferably 20% by weight or less, It is preferably 15% by weight or less.

Mixing and kneading a detergent component and a bleaching component are described in JP-A-60-96698.
As described in the publication, it can be performed by a kneader or the like. The kneading is preferably performed at a low temperature, and if necessary, the detergent components are cooled prior to the kneading.

The obtained kneaded product is granulated by a cutter mill type crusher equipped with a screen classifier and an extrusion granulation method including an extrusion step and a cutting step. The particle size of the resulting granules is preferably about 10 # to 100 # (JIS sieve), 0.5 g / c
It has a bulk density of c to 1.2 g / cc.

The obtained granular detergent is preferably subjected to at least one of rectification and coating treatment as described in JP-A-60-69998 in order to improve its fluidity. Further, a part of the detergent components as described above may be powder-blended.

In detergents with persulfuric acid (hydrogen) salt powder blended as a bleaching agent, the persulfuric acid (hydrogen) salt becomes locally high in concentration when it dissolves and reacts with alkali components to react with persulfuric acid (hydrogen).
Decomposition of salt occurs at a high concentration, and the colored fabric in this portion is discolored. On the other hand, the granular detergent obtained in the present invention is
The bleaching agent component having a small particle size is uniformly dispersed and mixed and kneaded in the detergent component, and the amount exposed on the surface of the granular detergent is small. Therefore, locally high density is prevented, and discoloration and fading of the colored fabric are effectively prevented. As described above, the detergent composition of the present invention prevents discoloration of the colored fabric even in the presence of a high alkali, and therefore exhibits a remarkable effect when applied as a heavy alkali detergent. When the detergent composition of the present invention from which the persulfuric acid (hydrogen) salt has been removed is dissolved to have an aqueous solution concentration of 1%, a pH of 1 is obtained.
0.5 or more, preferably pH 11 or more, more preferably pH 12
It is particularly effective for detergent compositions such as ~ 13.

Effects of the Invention According to the method of the present invention, a persulfate or hydrogen persulfate having a high bleaching effect can be stably added to a detergent composition in the production process thereof, and the obtained detergent composition is , It is possible to effectively prevent the discoloration and fading of the colored fabric, and to exert the excellent bleaching power of the persulfate (hydrogen) salt. Further, since it is possible to remove undesired dust generated when the bleaching agent is powder-mixed with the detergent particles, it is an industrially very useful process.

Examples The evaluation methods in the following examples are as follows, and the evaluation results are collectively shown in Table 1 below.

(1) Discoloration and fading (local discoloration) 0.5 gr of each detergent composition is evenly sprinkled on a test cloth (a red jeans cloth dyed with a product) cut into 5 cm x 5 cm. Put a towel on this and pour 200m of water.

After 5 minutes, the test cloth is taken out, washed with water, dried and judged.

No discoloration at all 5 There is a lightly discolored part 4 There is a part that is quite white 3 A part that is quite white 2 The part that comes in contact with the detergent is all white 1 (2 ) Residual active oxygen ratio The active oxygen in Oxone is measured by standard iodometric titration.

Precisely weigh the detergent so that the oxone in the detergent is 0.1-0.2 gr, and put it in a 300 cc Erlenmeyer flask. About 50% acetic acid in water
Add 0 m and stir again for about 10 seconds. At this time, the solution has a brown color. The mixture is titrated with 1/10 N-sodium thiosulfate standard solution while stirring, and the point at which it becomes colorless is taken as the end point.

(F: Factor of sodium thiosulfate) The residual active oxygen ratio is the active oxygen (%) of the oxone used alone.
Is the percentage obtained by dividing the above value by the value of.

Example 1 A detergent base material having the following composition was prepared by a spray drying method.

Α- olefin sodium sulfonate of _{C 14 ~ 18 (AOS-Na} ) 15% sodium dodecylbenzenesulfonate (C number of alkyl group: 12) 20% Zeolite 25% 10% sodium potassium 10% sodium silicate carbonate ( Na ₂ O / SiO ₂ = 1 / 2.2) 10% Glauber's salt / others 4% Moisture 6% 452.1 g of this material was placed in a table kneader and 22.9 g of water was added.
And kneaded for 15 minutes. The temperature at this time was 25 ° C. After that, 25g of oxone with an average particle size of 150μ was added,
Knead for another 15 minutes. The temperature of the solid detergent after kneading was 26 ° C. The solid detergent was taken out of the kneader and crushed with a cutter mill having a screen classification mechanism. The temperature of the crushed material was 28 ° C. 12 # ~ 6 of this crushed particles
0 # (JIS sieve) was used as a product (detergent composition). BD (bulk density) is
It was 0.75 g / cc.

Example 2 Linear alkylbenzene sulfonic acid (C number of alkyl group: 1
0-14) 100g and potassium hydroxide 37g (50% solution) are neutralized in a tabletop kneader, then powder AOS-Na 52g (water content 2%), powder zeolite 125g (water content 20%), nonionic activity Agent (addition of 15 mol of ethylene oxide to primary alcohol having 12 to 13 carbon atoms) 20 g (water content 0%), sodium carbonate 50
g (water content 0%), potassium carbonate 50 gr (water content 0%), and sodium metasilicate (molar ratio 1/1) 50 g (water content 0%) were added, mixed, and kneaded for 20 minutes. The temperature of the kneaded product was 28 ° C, and it became a hard one-piece product. After that, 25.5 g of oxone having an average particle size of 100 μm was added and kneaded for 10 minutes. The temperature did not change. The kneaded product solid detergent was taken out from the kneader and crushed with a cutter mill. At this time, cold air at 15 ° C was supplied to the crusher. Temperature of crushed material is 23 ℃
Became. The 12 # to 100 # (JIS sieve) of the crushed particles was used as a product (detergent composition). The BD was 0.80 g / cc.

Comparative Example 1 A granular detergent was prepared by treating only the detergent base material in the same manner as in Example 1 without adding oxone. This granular detergent (12 #
~ 60 #) was powder-mixed with oxone having an average particle size of 100 µ to prepare a detergent composition.

Comparative Example 2 A detergent composition was prepared in the same manner as in Example 2 except that Oxone having an average particle size of 200 μ was used.

Claims (1)

[Claims] 1. A bleaching agent component containing a persulfate and / or hydrogen persulfate as a main component and having an average particle size of 150 μm or less and a detergent component are homogeneous in a state where the detergent component does not substantially contain free water. A bulk detergent having a bulk density of 0.5 to
A method for producing a high bulk density detergent composition containing 1.2 g / cc of a bleaching agent.