JPS60133096A - Manufacture of 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 The present invention provides a granular detergent composition containing an α-sulfo fatty acid ester salt, which suppresses hydrolysis of the α-sulfo fatty acid ester salt even when stored for a long period of time. Party related to things.

In recent years, phosphates in detergents have been regulated for environmental reasons, and research has begun on granular detergents that can provide good detergency and powder properties without using phosphates. It has been made from four points: an alternative builder to the acid salt and a surfactant itself.

Among these, α-sulfo fatty acid ester salts have attracted attention because they have excellent detergency and dirt dispersibility, are insensitive to calcium, and exhibit detergency even in submerged water with high hardness. Publication No. 6276, 47-125
Granular detergents using this activator have been reported in Publication No. 82 and others.

However, during production by spray drying and subsequent storage, the ester bond of α-sulfo fatty acid ester salts is broken by hydrolysis, resulting in α-sulfo fatty acid di-salts that are sparingly soluble in water and have no surface activity. The problem was that it was easy to change.

As a countermeasure against this, for example, Japanese Patent Application Laid-Open No. 52-117908
It is reported in the above publication that polyethylene glycol is added to a detergent slurry containing an α-sulfo fatty acid ester salt to prevent hydrolysis of the α-sulfo fatty acid ester salt during spray drying. Also, JP-A-50-15190
Publication No. 5 reports that a-sulfo fatty acid ester salts in granular detergents are susceptible to ester bond cleavage during storage, and that this is facilitated when granular detergents are prepared by spray drying. As a countermeasure against this problem, the combined use of a hindered phenol compound and a hydroxypolycardiphosphoric acid or a salt thereof has been proposed.

Furthermore, JP-A No. 52-28507 proposes the use of a specific alkali builder because a-sulfo fatty acid ester salts tend to be hydrolyzed over time in the coexistence of alkali builders such as sodium silicate. has been done.

However, the above-mentioned measures are still insufficient, and in particular, the lack of storage stability has led to deterioration over time in the market, and improvements have been delayed. In addition, alkaline builder is an essential ingredient in laundry detergents, and it is also a necessary ingredient from the standpoint of powder physical properties. It was hoped that they would coexist.

The present inventors have intensively studied from the above viewpoint, and by subjecting a granular detergent containing α-sulfo fatty acid ester salt to air-surface contact treatment with acidic gas, hydrolysis of α-sulfo fatty acid ester salt over time has been achieved. It was discovered that hydrolysis was suppressed even in the coexistence with a general-purpose alkali builder, and based on this knowledge, the present invention was completed.

That is, the method for producing the granular detergent composition of the present invention comprises a-
The present invention is characterized in that a granular detergent containing a sulfo fatty acid ester is subjected to gas-solid contact treatment with an acidic gas.

The a-sulfo fatty acid ester salt used as the main active agent component in the present invention has the general formula (I) (wherein R, and R
3 is an alkyl group, and M is a cation. ) In the formula, R1 is suitably an alkyl group having 4 to 20 carbon atoms, and R2 is suitably an alkyl group having 6 to 6 carbon atoms, and these are straight-chain It may be in the form of a chain or a branched chain. Moreover, as R1, a methyl group, an ethyl group, an n-propyl group, and an isopropyl group are suitable. M
Alkali metals such as sodium and potassium are preferable, and ammonium and magnetic screw +7A fx are also suitable.
Examples include: This solid a-sulfo fatty acid ester salt can be produced by a conventional method using, for example, a fatty acid having 6 to 22 carbon atoms as a raw material, and hydrogenated beef tallow fatty acid or hydrogenated palm oil fatty acid is preferable as the raw fatty acid.

Granular detergents containing α-sulfo fatty acid ester salts can be prepared, for example, by spray-drying a detergent slurry containing α-sulfo fatty acid ester salts or, if necessary, detergent components such as other active ingredients and builders. It is obtained by granulating a detergent composition containing a fatty acid ester salt into powder.

In the present invention, the granular detergent thus obtained is subjected to air-surface contact treatment with acidic gas. Air-surface contact treatment is a moving bed, packed l-1 flow! - or a rotating container with an acidic gas atmosphere inside, but from the viewpoint of efficiency, a fluidized bed or a packed bed is preferred. This treatment can be carried out by providing a separate air-surface contact treatment device, but it is also possible to carry out the treatment simultaneously with the transportation by using acidic gas as the carrier gas in a powder transportation device such as an air lift. Acid gas and 1. Then, CO□ gas is the most suitable,
Other SO, NOZ gases can also be used. Further, if necessary, these acidic gases may be diluted with a non-acidic gas such as air. The processing gas density is closely related to the dilution gas ratio and processing time, but in order to perform efficient processing in the manufacturing process, it is necessary to use a gas with a concentration of about 50% at a rate of 20t/min or more per 1 kg of detergent. It is preferable to process for about a minute.

The granular detergent composition of the present invention may further contain the following optional components as required. These ingredients include alkylbenzene sulfonates, alkyl sulfonates, a-olefin sulfonates, alkyl sulfates, alkyl polyether sulfates, anionic surfactants such as fatty acid soaps, alkyl ethoxylates, and alkylphenyl ethoxylates. , nonionic surfactants such as alkyl alkanolamides, amphoteric surfactants such as alkyl betaines, inorganic builders such as sodium silicate, sodium carbonate, sodium bicarbonate, sodium tripolyphosphate, sodium birophosphate, zeolite, sodium sulfate, citric acid. Examples include organic builders such as sodium, sodium ethylenediaminetetraacetate, sodium nitrilotriacetate, and the like.

In addition, polyethylene glycol, calxoxymethyl cellulose, enzymes, fragrances, pigments, etc. can also be contained. These components may be blended together with α-sulfo fatty acid ester salts in a detergent slurry and spray-dried to form a powder and coexist in the detergent particles, or they may be made into a powder and blended separately. Good too. This powder blend may be prepared either before or after treatment with acidic gas.

According to the production method of the present invention, even in the presence of an alkali builder, by subjecting a granular detergent containing an α-sulfo fatty acid ester salt to air-surface contact treatment using an acidic gas,
Decomposition of the α-sulfo fatty acid ester salt over time is effectively suppressed, and deterioration of the performance of the detergent composition during long-term storage can be prevented.

Examples 1-8 A granular detergent having the following composition was prepared by spray drying.

Sodium salt of α-sulfo fatty acid methyl ester 15w
t% (number of carbon atoms in fatty acid residue: 14-18) 08. ～, 6 Sodium alkyl sulfate xowt No. 12 silica 10w1% Zeolite l Owl water 4wt% Soybean salt Noronance These granular detergents were subjected to contact treatment using a fluidized bed apparatus with the acidic gas shown in Table 1. , granular detergent compositions of the present invention were prepared (Examples 1 to 8). In addition, as controls, an untreated granular detergent composition (Comparative Example 1) and a granular detergent composition subjected to contact treatment with air (Comparative Example 2) were prepared.

The rate of increase in hydrolysis of these compositions was measured by the following method, and the results are shown in Table 1.

Determine the total amount of surfactant by methylene sol back titration method,
The total i of α-sulfo fatty acid ester salt and α-sulfo fatty acid resin salt is determined from the preset blending ratio of surfactants.
Enter M. Next, the detergent composition is treated with p')IIF, a 90% ethanol solution at 50° C., and is separated as an α-sulfolipid fat resin insoluble fraction. This di-salt was dissolved in a 50% ethanol solution, and the di-salt was determined by methylene blue back titration.
518, and calculate the hydrolysis rate from the following formula.

D:, -X 100 According to the above operation, the hydrolysis rate is calculated immediately after the detergent composition is produced and after being left at 35°C for one month, and the rate of increase in hydrolysis is calculated according to the following formula.

Hydrolysis increase rate = (Hydrolysis rate after 1 month) - (Hydrolysis rate immediately after production) (Left below blank) Examples 9 to 12 Granular detergents were subjected to KS'JJ in the same manner as in Example 1, and Table 2 00. / air ratio using an air lift (inner diameter 9 m, length 20 m, wind speed 15 Table 2)

Claims (1)

[Claims] 1. A method for producing a granular detergent composition, which comprises subjecting a granular detergent containing an α-sulfo fatty acid ester salt to a gas-contact treatment with an acidic gas.