JPH0318679B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel granular detergent composition that exhibits excellent softening and cleaning effects. BACKGROUND ART Conventionally, it has been known that by blending bentonite into a detergent, clothes can be softened at the same time as being washed. However, in this case, since montmorillonite, a component of bentonite, is adsorbed onto the fibers, the removal of dirt from clothes is inhibited, and the cleaning effect is inevitably reduced. In order to prevent such a decline in cleaning effectiveness,
Various methods have been tried so far, but no satisfactory method has yet been known. In order to overcome the drawbacks of such clay-containing cleaning agents, the inventors of the present invention have conducted various studies, and have surprisingly achieved their objective by using a composite clay mainly composed of montmorillonite and kaolin. Based on this knowledge, the present invention was completed. That is, the present invention comprises (A) 5 to 40% by weight of anionic surfactant, (B) 5 to 60% by weight of detergent builder, and
(C) A granular detergent composition characterized in that it contains 1 to 30% by weight of a composite clay whose main components are montmorillonite and kaolin. Examples of the anionic surfactant (A) used in the cleaning composition of the present invention include an alkali metal salt or magnesium salt of a linear alkylbenzenesulfonic acid having an alkyl group having 10 to 15 carbon atoms;
Alkali metal salt or magnesium salt of α-olefin sulfonic acid having 12 to 20 carbon atoms, 10 to 20 carbon atoms
Sodium salt of 18 alkyl sulfate ester, alkali metal salt of α-sulfo fatty acid ester having 12 to 20 carbon atoms, alkali metal salt or magnesium salt of sulfate ester of ethylene oxide adduct of higher alcohol having 8 to 20 carbon atoms, carbon number Examples include sodium paraffin sulfonate having 14 to 20 carbon atoms and sodium chloride having 12 to 18 carbon atoms. The blending amount of these anionic surfactants is in the range of 5 to 40% by weight based on the cleaning composition,
Preferably it is in the range of 10 to 30% by weight. Further, the detergent builder of component (B) used in the detergent composition of the present invention may be either an inorganic builder or an organic builder. Examples of inorganic builders include sodium and potassium salts of condensed phosphoric acids such as tripolyphosphoric acid, hexametaphosphoric acid, and pyrophosphoric acid, sodium carbonate, potassium carbonate, sodium silicate, potassium silicate, sodium borate,
Examples of organic builders include sodium citrate, potassium citrate, sodium nitrilotriacetate (NTA), potassium nitrilotriacetate,
Examples include salts of sodium succinate, sodium gluconate, sodium tartrate, and polymers such as polymaleic acid, polyitaconic acid, polyacrylic acid, olefin-maleic acid copolymer, and alkyl vinyl ether-maleic acid copolymer. These detergent builders keep the cleaning liquid alkaline in the pH range of 8 to 11, prevent calcium ions in the cleaning liquid from bonding with anionic surfactants, and remove dirt components once detached from the fibers during washing. In particular, it has the effect of preventing the solid particle components from being deposited on the fibers again and improving the fiber cleaning performance. The amount of detergent builder blended is in the range of 5 to 60% by weight based on the detergent composition of the present invention, preferably
It ranges from 10 to 40% by weight. In addition, the composite clay of component (C) used in the cleaning composition of the present invention is mainly composed of two types of clay minerals, montmorillonite and kaolin, and is completely different from a simple mixture of conventional clay minerals. It is a clay that cannot be separated by mechanical operations such as hydration or centrifugation, and exhibits respective peaks for montmorillonite and kaolin in its X-ray diffraction diagram. Examples of such clay include clay produced in the Kasaoka region of Okayama Prefecture and clay produced in the Odo region of Niigata Prefecture. Although the detailed mechanism by which this composite clay satisfies the softening effect and detergency at the same time has not yet been clarified, the adsorption of montmorillonite to the fibers
It is thought that the presence of kaolin, which has a poor adsorption power to coexisting fibers, moderates the amount of dirt, facilitates the removal of dirt, and maintains the softening effect. The amount of composite clay blended is in the range of 1 to 30% by weight, preferably 5 to 30% by weight based on the cleaning composition of the present invention.
It is in the range of 20% by weight. The granular cleaning composition of the present invention may optionally include:
In addition to the components (A), (B), and (C), various additives commonly used in granular detergents, such as enzymes, fragrances, coloring agents, and inorganic salts, can be added. The composition of the present invention thus obtained exhibits an excellent softening effect without any deterioration in the cleaning effect. Next, the present invention will be explained in more detail with reference to Examples. The detergency and flexibility were evaluated using the following methods. (1) Cleaning power evaluation method (a) Artificially soiled cloth Clay containing crystalline minerals such as kaolinite and vermiculite as the main components is used as an inorganic soil.
After drying at 200°C for 30 hours, it was ground to an average particle size of 1 μm and used. 3.5 g of gelatin and 0.25 g of carbon were added to 950 c.c. of water, and after dissolving the gelatin at approximately 40°C, the carbon was dispersed in the water using Polytron (manufactured by KINEMATICA, Switzerland), a strong emulsifying and dispersing agent. Next, 14.9 g of inorganic dirt was added and dispersed with a polytron, and 31.35 g of oily dirt was further added and emulsified and dispersed with a polytron to create a stable dirt bath. After immersing a 10cm x 20cm designated clean cloth (cotton cloth No. 60 designated by Japan Oil Chemists Association) in this dirt bath,
Water was squeezed using two rubber rolls to equalize the amount of dirt attached. After drying this soiled cloth at 105° C. for 30 minutes, both sides of the soiled cloth were rubbed 25 times on each side. Cut this into 5cm x 5cm and the reflectance is 42±2
% range was applied to a dirty cloth. The soil composition of the artificially soiled cloth thus obtained is shown in Table 1.

【table】

[Table] (B) Sebum cloth Cloth (cotton knitted 5cm x 5cm) with 60mg of oil-based dirt shown in Table 1 attached to each piece. (c) Clean knitted cloth Cotton knitted cloth (same cloth used for sebum cloth) (d) Cleaning method The cleaning device is USTesting's Terg-O-
Using a tometer, put 10 pieces of artificially soiled cloth and 3 pieces of Sebum cloth, then add a clean stockinette cloth, adjust the bath ratio to 30 times, and run at 120 rpm for 10 minutes.
Wash at °C. Use 900 ml of a cleaning solution with a detergent concentration of 0.133%, and rinse with 900 ml of water for 3 minutes. The water used was 3°DH. (E) Cleaning power evaluation method Cleaning power (%) = (K/S of dirty cloth - K/S of washed cloth)/
(K/S of soiled cloth - K/S of unstained cloth) x 100 K/S = (1-R/100) ² /2R/100 ... [Kubelka-Munk formula] R is Carl Zeiss ELREPHO Reflectance (%) measured by reflectometer. The values in the test examples are the average values of 10 test artificial soiled cloths. (2) Softness evaluation method A commercially available cotton towel was washed in a regular two-tank electric washer using a commercially available heavy detergent for clothing, and the washing and drying process was repeated three times to evaluate the various treatments that had adhered to the towel. remove the agent. Approximately 25°C tap water (hardness approximately 3°DH) in the washing tank of a two-tank washing machine (washing tank capacity 30, jet type for washing, centrifugal type for dehydration) 30
Add 40g of detergent and 1kg of the above-treated towel, and wash for 10 minutes. After rinsing twice with the same tap water and centrifuging dehydration, hang it outside to dry. The softness of towels after drying was evaluated by 10 people, ``Industrial Sensory Testing Handbook'' (edited by the Japan Society of Science and Technology Sensory Testing Committee, published by JUSE Publishing Co., Ltd., 1963).
Measurements were made according to the method described on pages 300-309. By Scheffe's paired comparison method,
If there is a difference in the softness of a pair of towels washed with two different detergents, the softer towel will be given +2 points and the stiffer towel will be given -2 points, indicating a slight difference. If there is, +1 point and -1 point respectively.
If there is no difference at all, 0 points will be given to both. The scores obtained in this way were statistically processed using a computer, and a relative ranking of flexibility was determined. Further, each abbreviation in Examples and Comparative Examples has the following meaning. LAS: Sodium alkylbenzene sulfonate (alkyl group carbon number 10-14, average molecular weight
346) AOS; Sodium α-olefin sulfonate (14 to 18 carbon atoms, average molecular weight 350) STP; Sodium tripolyphosphate zeolite; Synthetic zeolite (Mizusawa Kagaku Silton B, average particle size 2μ) Sil: Sodium silicate Ash; Sodium carbonate Enzyme: Novo Protease Reference Example The constituent minerals of various clays and changes in constituent minerals due to refining were investigated. The results are shown in Table 2.

[Table] Examples 1 to 4, Comparative Examples 1 to 4 Detergent compositions containing various clays having the following compositions were prepared and evaluated for detergency and flexibility. Composition of cleaning composition; LAS: 15% by weight, AOS: 5% by weight, STP: 20
Weight%, Sil: 15% by weight, Ash: 10% by weight, Fluorescent agent: 0.6% by weight, CMC: 1.0% by weight, Fragrance: 0.3
Weight%, clay: 10% by weight, Na ₂ SO ₄ and water: balance In Examples 1 to 4, the clays of Reference Examples Nos. 5 to 8 were used, and in Comparative Examples 2 to 4, the clays of Reference Examples Nos. 1 to 3 were used. was used. In Comparative Example 1, no clay was added. These results are shown in Table 3.

【table】

[Table] Examples 5 to 7, Comparative Example 5 Using the Kasaoka clay of Reference Example No. 5, detergent compositions were prepared with different blending amounts, and the detergency and flexibility were evaluated. The composition of the cleaning composition is shown below. Composition of cleaning composition; LAS: 10% by weight, AOS: 10% by weight, Zeolite: 20% by weight, Sil: 15% by weight, Ash: 10% by weight,
Enzyme: 0.2% by weight, CMC: 1% by weight, Fluorescent agent:
0.5% by weight, clay: 0 to 30% by weight, Na ₂ SO ₄ and water: balance Examples 5 to 7 contain 5 to 30% by weight of clay, and Comparative Example 5 does not contain clay. These results are shown in Table 4.

【table】

Claims (1)

[Scope of Claims] 1 (A) 5 to 40% by weight of anionic surfactant, (B) 5 to 60% by weight of detergent builder, and (C) composite clay containing montmorillonite and kaolin as main components.
A granular detergent composition containing 30% by weight.