JPS60262895A - Manufacture of granular detergent - 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 relates to a method for producing a granular detergent that improves the powder properties of a granular detergent, particularly the pressurized solidification property of a phosphorus-free detergent upon moisture absorption.

Phosphate-based builders are excellent inorganic builders and have conventionally been widely incorporated into granular detergents.

However, in consideration of eutrophication in lakes, marshes, inner bays, etc., efforts are being made to eliminate phosphorus. Alkali silicate salts, alkali carbonate salts, alkali bicarbonate salts, etc. are used as substitutes for phosphoric acid builders, and zeolites have recently attracted attention.

However, although these alternative builders were recognized to be effective in improving detergency, the effect of modifying powder properties was insufficient.

In order to improve the solidifying properties of such phosphorus-free granular detergents due to moisture absorption, the applicant coated the outer surface of the granulated detergent with a layer of non-hygroscopic builder, metal soap, or aluminosilicate, and added a layer to the surface of the detergent particles. proposed to modify the properties of
No. 51508, JP-A-50-24305).

In addition, we have found that by attaching water-insoluble or poorly water-soluble powder to granular detergent, the physical properties of the granular detergent can be improved.
The following magnesium oxide, aluminum hydroxide, heavy calcium carbonate, white carbon, titanium oxide (Japanese Unexamined Patent Publication No. 114807/1983) or average particle size 2 to 5μ
proposed calcium carbonate (Japanese Unexamined Patent Publication No. 103406/1983).

Ming tries to ′. However, although the method of coating detergent particles with a film layer disclosed in JP-A No. 50-24305 is effective in preventing solidification due to the initial moisture absorption rate, it is complicated in the process and disadvantageous in the production of homogeneous products. Not only is there a problem in terms of difficulty in obtaining it, but
There were also problems with detergent solubility, moisture absorption and solidification properties during long-term storage, and the results were not necessarily satisfactory.

In addition, the method of coating by adhering powder as described in JP-A-53-'114807 etc., although the manufacturing operation is simple, does not adhere well, so it is difficult to adhere to the powder while maintaining cleaning power. Further improvements were made in terms of obtaining sufficient powder property modification effects.

An object of the present invention is to provide a method for producing a granular detergent that can improve powder physical properties without impairing detergency.

That is, the fJ method for producing a granular detergent of the present invention has a particle surface of a granular detergent containing at least one kind of anionic surfactant, an alkali metal silicate, and an alkali metal carbonate having a -order particle size of 0. It is characterized in that 0.5 to 3 parts of finely precipitated calcium carbonate in the form of dice of 1 to 1.5 μm are deposited per 100 parts by weight of the granular detergent.

The anionic surfactants used in the granular detergent of the present invention include alkylbenzene sulfonates whose alkyl group has 8 to 15 carbon atoms, alkyl sulfates whose alkyl group has 8 to 8 carbon atoms, and alkyl sulfates whose alkyl group has 8 to 8 carbon atoms. Alkyl ether sulfate, which is made by adding 1 to 8 ethylene oxides on average to an alcohol with 8 to 18 carbon atoms, α-olefin sulfonate having 12 to 22 carbon atoms (α-
olefin sulfonates (mixtures of alkenesulfonates, hydroxyalkanesulfonates, etc.), alkanesulfonates obtained from paraffins having 12 to 22 carbon atoms, higher fatty acid salts, and salts of condensates of higher fatty acids and taurine ( N-acylaminoethanesulfonate), salts of dialkyl sulfosuccinates, and the like. These are suitably alkali metal salts, and in the case of sulfonic acid or sulfate type anion activators, magnesium salts are also suitable.

The anionic activator is suitably blended in the granular detergent in an amount of 10 to 40% by weight, preferably 15 to 30% by weight.

The granular detergent of the present invention also contains alkali metal silicates and alkali metal carbonates as inorganic builders, with sodium salts and potassium salts being preferred. The alkali metal silicate is preferably M2O・n5jO□ (M: alkali metal) with a molar ratio n of 2°0 to 3.6. It is preferable that the alkali metal silicate be blended in the detergent in an amount of 4 to 20 wt%. Suitable, preferably 8 to +5 iyt%.

The alkali metal carbonate is suitably blended into the detergent in an amount of 2 to 40 vt%, preferably 5 to 3 (ht%).

1- The detergent containing each component is granulated by a spray drying method or the like to form a granular detergent having a particle size of 300 to 600 μm.

The particle surface of this granular detergent has a particle size of 0.1-1.
5 μm, preferably (1,33-1 p) of precipitated calcium carbonate is deposited. The coating with this powder is carried out using a rotary mixer,
This can be done with a mixer such as a vibrating mixer, and
It can also be carried out using a granulator such as a rotary granulator, a transfer granulator, or a vibration granulator.

When the primary particle size of the rehydrated calcium is larger than 1.5 μm, the effect of modifying the powder physical properties deteriorates;
If it is less than that, agglomeration will be severe and the effect of improving powder physical properties will be small, and handling will become difficult.

The amount of finely precipitated calcium carbonate powder used is 10% of the granular detergent.
0.5 to 3 parts by weight, preferably 1 to 2 parts by weight
Parts by weight. If it is less than 0.5 parts by weight, the effect of improving the powder physical properties will be insufficient, while if it exceeds 3 parts by weight, the detergency will decrease.

Further, in the present invention, it is important that the fine precipitated calcium carbonate has a dice-like shape, and it is preferable that the particle has a minimum diameter/maximum diameter ratio of 0.3 to 0.7, and more preferably the above-mentioned The ratio is 0.4-0.7. By forming such dice-shaped particles, the granular detergent can be efficiently coated. If the ratio is outside the above range, the effect of modifying the powder physical properties will be insufficient. Such dice-shaped finely precipitated calcium carbonate can be obtained, for example, from Pfizer Quigley, Okutama Kogyoku.

The granular detergents surface-modified in the present invention include organic bilters such as citrate, malate, tartrate, maleate polymers, alkyl-substituted succinates, oxysymbolates, water-soluble sulfuric acid JIA, and reagents. Anti-fouling agents (CMC, PEG,
(PVA, etc.), foam.

It may also contain optional ingredients such as brighteners, optical brighteners, bleaching agents, pigments, and fragrances.

By attaching fine precipitated calcium carbonate to a granular detergent, the powder physical properties of the detergent particles are improved. Generally, precipitated calcium carbonate has a spindle shape or a columnar shape, and if it has such a shape, the contact area with the detergent particle surface is small and it is difficult to adhere to the surface of the detergent particle, so that the effect of improving powder properties is inferior.

According to the production method of the present invention, powder properties such as fluidity, moisture absorption solidification property, pressure solidification property, etc., can be improved without reducing detergency.
In particular, it is possible to improve the pressurized solidification properties upon moisture absorption.

A granular detergent having the following composition and an average particle size of 400 to 500 μm was produced by spray drying.

Sodium alkylbenzenesulfonate (C: 1O-14) 12vt% Sodium α-olefin sulfonate (C: 13-18) +2st% Sodium silicate (S j, 02/N a20 = 2.2)
12 wt% Soda carbonate 10 νL% Water 5 νt% Sodium sulfate Balance To 100 parts by weight of this granular detergent, the parts by weight shown in Table 1 of precipitated calcium carbonate having the properties shown in Table 1 were added, and the mixture was mixed in a ■ type mixer. Mixed for 5 minutes to deposit and coat the calcium carbonate onto the surface of the granular detergent.

The hygroscopic solidification properties and detergency of each of these samples (Nn2-8) and the sample to which calcium carbonate was not attached (No. 1.) were measured according to the following procedure and are shown in Table 1. The minimum diameter/maximum diameter ratio in Table 1 was determined by measuring the maximum diameter and minimum diameter of each particle using an electron microscope photograph, and taking the average of n=50.

Sakai 2 support gate (1: (! (]ltel)-Detergent Cal 1-
(22 x 15.5 x 5.5 cm, moisture permeability 300
/nI'24hr) filled with particles :)5°
C-100% Humidity Box (Ilumj
After leaving 3 El in a diLy Box), the carton was cut open, carefully transferred to a 4-mesh Fluie L, and the sieve was gently vibrated.The weight of the sieve was expressed as the ratio of the weight of the original sample to the weight of the sieve.

Attach a L1 side cloth (cotton) to the collar of a dress shirt, wear it for 2 to 7 days until it becomes contaminated, then remove it and cut it symmetrically on the left and right sides to prepare 20 pieces each. Separately, prepare a skin shirt (cotton knitted) that has been worn for 2 to 3 days and divide it symmetrically. One of the wiping cloth and the skin shirt contaminated in this way was treated with a standard detergent (no calcium carbonate attached, No. 1 in Table 1), and the other was treated with a test sample (no calcium carbonate attached).

After washing for 10 minutes at a detergent concentration of 0.15%, a liquid temperature of 25°C, and a bath ratio of 30 times, using No. 2 onwards in Table 1, the clothes were rinsed twice for 3 minutes each. After cleaning, the right and left sides of each pair of wiping cloths were compared and judged with the naked eye, and the value obtained by dividing the rating of each sample detergent by the rating of the cleaning power of the standard detergent and multiplying the result by 100 was used as the cleaning power index.

(Margin below)

Claims (1)

Scope of Claims: (1) A particle surface of a granular detergent containing at least one anionic surfactant, an alkali metal silicate, and an alkali metal carbonate has a particle size of 0.1 to 1. Add 5 μl of diced fine precipitated calcium carbonate to 10 μl of the granular detergent.
A method for producing a granular detergent, characterized in that 0.5 to 3 parts by weight are deposited per 0 parts by weight. 2. The method for producing a granular detergent according to claim 1, wherein the fine precipitated calcium carbonate has a dice-like shape with a minimum diameter/maximum diameter ratio of 0.3 to 0.7.