JPH0384100A - Production of detergent composition having high bulk density - Google Patents

Abstract

PURPOSE:To obtain the subject composition having easily controllable bulk density and preventing the deterioration of storage stability to improve the solubility in cold water by mixing a specific amount of a granular detergent having high bulk density in powdery state to a spray-dried granular detergent containing an anionic surfactant and a zeolite. CONSTITUTION:The objective composition is produced by mixing (A) 1-15wt.% of a spray-dried granular detergent composed of (i) 20-50wt.% of an anionic surfactant (e.g. a straight-chain alkylbenzene sulfonate having 8-16C alkyl group), (ii) 10-70wt.% of a zeolite (e.g. A-type zeolite), (iii) 0-30wt.% of an alkaline builder and (iv) 2-8wt.% of water to (B) a granular detergent having high bulk density and containing 20-40wt.% of an anionic surfactant. 10-40wt.% of a zeolite and 10-30wt.% of an alkaline builder by a powder-mixing process.

Description

[Detailed description of the invention] industrial TECHNICAL FIELD The present invention relates to a method for manufacturing high bulk density detergent compositions.

Conventional laundry detergents have a bulk density of 0.3 g / cc
It was produced as bead-like hollow particles of about 100 ml.

However, such detergents have a low specific gravity and a low active agent concentration, which increases transportation costs and requires a considerable amount of space for storage and display.Furthermore, even in ordinary households, it is difficult to find a place to store them and it is difficult to measure them. Ta. So recently,
A method for producing a high bulk density granular detergent that can be cleaned with a small amount of detergent has been proposed (Japanese Patent Laid-Open No. 60-96698), and is also commercially available.

However, high bulk density detergents have poor solubility because the composition is packed deep inside the detergent particles, and the bulk density (BD) of the detergent is almost determined by the composition, making it difficult to control. There was a problem that. The BD of high bulk density detergents already on the market is 0.76-0.8.
0g/cc, and the size of the container and the capacity of the measuring spoon are determined accordingly. Therefore, B Do,
If a high bulk density detergent of 80 g/cc or more is manufactured and the same container and measuring spoon are used, the problem arises that the head space of the container becomes large and the amount used per use increases more than necessary. . For this reason, it is necessary to control BD when producing high bulk density detergents.

OBJECTS OF THE INVENTION The present invention provides a method for producing a high bulk density detergent composition that has improved solubility and allows control of bulk density.

The method for producing the high bulk density detergent composition of the present invention includes 20 to 50% by weight of an anionic surfactant and 10 to 70% by weight of zeolite.
% by weight of spray-dried detergent particles and separately prepared high-bulk-density detergent particles in an amount of 1 to 15% by weight of the spray-dried detergent particles relative to the high-bulk-density detergent particles. shall be.

The present invention will be explained in more detail below.

Spray-dried detergent particles are obtained by spray-drying a detergent slurry in a conventional manner using a countercurrent spray drying tower. The bulk density is preferably about 0.2 to 0.4 g/cc, and the average particle size of the detergent particles is preferably about 300 to 600 μm.

The detergent slurry contains an anionic surfactant, zeolite and water, or a small amount of ingredients such as an alkali builder, a fluorescent agent, and an anti-refouling agent. %, 10 to 70% by weight of zeolite, 0 to 30% by weight of alkali builder, 2 to 8% by weight of water, and other optional ingredients.

Examples of anionic surfactants include the following.

1) Straight-chain alkylbenzene sulfonate having an alkyl group having an average carbon number of 8 to 16; 2) α-olefin sulfonate having an average carbon number of 10 to 20.

3) Alkyl sulfate having an average carbon number of 10 to 20, 4) α-sulfo fatty acid ester salt represented by the following general formula R1-CHCOOR" 803M (R'; Cs--□ alkyl group or alkenyl group R2; lower Alkyl group M; counter ion) 5) Alkyl ether sulfate or alkenyl having a linear or branched alkyl group or alkenyl group having an average of 10 to 20 carbon atoms and to which an average of 0.5 to 8 moles of ethylene oxide is added. ether sulfate; 6) saturated or unsaturated fatty acid salt having an average carbon number of 10 to 22;

As the counter ion in these anionic surfactants, alkali metal salts such as sodium and potassium are usually suitable.

The anionic surfactant is present in the spray-dried detergent particles from 20 to 5
It is blended into the detergent slurry so that it is contained in an amount of 0% by weight.

If this amount is less than 20% by weight, the cleaning power will be insufficient as a concentrated high bulk density detergent, while if it exceeds 50% by weight, the thermal stability during spray drying will deteriorate and the resulting detergent particles will become fine particles. It becomes difficult to

As the zeolite, type A zeolite is preferred, and it is present in the spray-dried detergent particles in an amount of 10 to 70% by weight, preferably 15 to 70% by weight.
It is blended into the detergent slurry so that it is contained in an amount of 60% by weight. If this amount is less than 10% by weight, the powder physical properties of the spray-dried detergent particles will deteriorate and the chelating power will also be insufficient. On the other hand, if it exceeds 70% by weight, it becomes substantially difficult to incorporate other detergent components, leading to an increase in cost.

As alkali builders, carbonates, silicates, borates, sulfites, etc. can be added to the detergent slurry in an amount of 0 to 30% by weight in the spray-dried detergent particles. If this amount exceeds 30% by weight, the pH of the detergent will become too high, which is not preferable. Furthermore, when blending an α-sulfo fatty acid ester salt as an anionic surfactant in a detergent slurry, the ester bond of this surfactant is cut by an alkaline agent and the α-sulfo fatty acid base decomposes. It is desirable not to include an alkali builder in the detergent slurry. In this case, the alkali builder required for the final detergent composition is supplied from high bulk detergent particles.

Other optional components such as a fluorescent agent are the same as those for the high bulk density detergent particles, so they will be explained all together later.

The water content in the spray-dried detergent particles is preferably 2 to 8% by weight. When the water content exceeds 8% by weight, the physical properties of the powder deteriorate. On the other hand, if the water content is less than 2% by weight, the drying energy required increases, and the thermal stability during spraying also deteriorates, causing problems such as scorching.

High bulk density detergent particles are produced by granulating each detergent component to a bulk density of 0.
It is obtained by preparing a high bulk density composition of 5 to 1.2 g/cc. This granulation method is described in Japanese Patent Application Laid-Open No. 62-59
As described in Publication No. 7, detergent raw materials such as anionic surfactants are kneaded and mixed in a kneader, crushed and granulated in a crusher such as a cutter mill type, and then water-insoluble fine powder is mixed. It can be obtained by Alternatively, high bulk density detergent particles can also be produced by spray-drying some or all of the detergent particle components in advance, and kneading and mixing this spray-dried product with the remaining detergent particle components. Furthermore, it can also be obtained by other granulation methods such as stirring granulation.

Conventional components are used in the high bulk density detergent particles, including other additives such as anionic surfactants, zeolites, alkali builders, and nonionic surfactants.

Preferred specific examples of anionic surfactants, zeolites, and alkali builders are the same as those for spray-dried detergent particles. The high bulk density detergent particles contain 20% anionic surfactant.
It is desirable to blend 10 to 40% by weight of zeolite and 10 to 30% by weight of alkali builder.

As the nonionic surfactant, the following are suitable.

(1) E○ addition type nonionic surfactant in which an average of 4 to 25 moles of ethylene oxide (E O) is added to a primary or secondary alcohol having 8 to 18 carbon atoms.

(2) EO-PO addition type nonionic interface in which an average of 4 to 25 moles of ethylene oxide (E O) and an average of 3 to 15 moles of propylene oxide (PO) are added to a primary or secondary alcohol having 8 to 18 carbon atoms. Activator.

Other additives include inorganic builders such as sodium sulfate, sodium tripolyphosphate, and sodium pyrophosphate; sodium citrate, sodium ethylenediaminetetraacetate, nitrilotriacetate, sodium polyacrylate, and sodium acrylate-sodium maleate anhydride. Polymers, organic chelate builders such as polyacetal carboxylate, anti-recontamination agents such as carboxymethyl cellulose and polyethylene glycol; rinse improvers such as soap; para-toluene sulfonate, toluene sulfonate, xylene sulfonate, urea, etc. Viscosity modifiers; enzymes such as protease, lipase, cellulase, amylase; softeners such as 4R ammonium salts and bentonite; bleaching agents, fluorescent agents, perfumes, pigments, etc. can be used.

The high bulk density detergent composition of the present invention is prepared by powder mixing the high bulk density detergent particles and the spray-dried detergent particles. During powder temperature, the amount of spray-dried detergent particles is 1 to 15% by weight, preferably 3 to 10% by weight, based on the high bulk density detergent particles.
Mix % by weight. If the mixing amount is less than 1% by weight, the effect of improving solubility is poor, and the effect of controlling bulk density is also small. On the other hand, if the mixing amount exceeds 10% by weight, the storage stability of the detergent composition will deteriorate.

Effects of the Invention According to the present invention, low bulk density spray-dried detergent particles containing a specific amount of anionic surfactant and zeolite are obtained by a spray drying method, and 1 to 15% by weight of the particles are added to the high bulk density detergent particles. By mixing the powders in proportions, it is possible to obtain a high bulk density detergent composition that prevents deterioration of storage stability and improves cold water solubility, and also allows easy control of bulk density.

(1) Preparation of spray-dried detergent particles A detergent slurry containing each component shown in the following Coating-1 was spray-dried in a countercurrent spray-drying tower to obtain spray-dried detergent particles having the composition shown in Table-1 below. Obtained.

Note that Tables 3 to 3 are collectively shown at the end of this specification.

(2) Preparation of high bulk density detergent particles The spray-dried particles having the composition shown in Table 1 were mixed with other additives shown in Table 2, and kneaded in a kneader.

The resulting intimate mixture pellets (10 mmφ x
20mm) and A-type zeolite or.

A fixed amount of sodium carbonate was fed into a pulverizer (manufactured by Okada Seiko, Speed Mill ND-30 type). The diameter of the crusher is 15c.
The crushing blades were rotated at 3000 rpm in 4 cross steps, and the screen was made of punching metal with a diameter of 2 mm and an aperture ratio of 20%.

The properties of high bulk density detergent particles obtained by mixing finely powdered zeolite with pulverized particles are shown in Table 2 along with the composition.

(3) Preparation and evaluation of high bulk density detergent compositions Spray-dried detergent particles were mixed with high bulk density detergent particles in the proportions shown in Table 3 below to prepare high bulk density detergent compositions.

This detergent composition was evaluated for solubility in cold water and storage stability using the following methods, and the results are shown in Table 3.

i Water-resistant Collect the detergent composition on a nylon tricot cloth (5 x 10 cm) and tie the top with rubber to make a detergent-containing bag.

After washing (Hitachi PS-5300 blue sky) 5℃ water 30I2
and 1.5 kg of cotton cloth, then put a bag containing detergent into it and let it stand for 2 minutes.

Spin the washing machine for 5 minutes.

Next, the bag containing the detergent was taken out and dried at 105° C. for 3 hours, and the insoluble content was calculated using the following formula.

Insoluble content = 2s x ioo (%) (ii) Storage stable detergent composition at 660 m A (11 x 4 x 15 c
After filling 90% of the neo-sand carton (m) and gluing it, it was stored in an atmosphere of 35° C. and 85% RH for 7 days.

After that, open it and receive 6 meals. Measure the amount of water passing through the tube and judge based on the following criteria. Set.

0: Unpassed amount 10% or less ■=Unpassed amount 10-20 %: Untraveled amount 20-30 %: Unpassed amount 30% or more (Margin below)

Claims (1)

[Claims] 1. Spray-dried detergent particles containing 20-50% by weight of anionic surfactant and 10-70% by weight of zeolite and separately prepared high-bulk-density detergent particles are applied to the high-bulk-density detergent particles. A method for producing a high bulk density detergent composition, which comprises mixing powders in an amount of 1 to 15% by weight.