JPH0196297A - Bleaching agent composition - Google Patents

Abstract

PURPOSE:To obtain a reducing type bleaching agent composition, containing a bleaching improver consisting of thiourea dioxide, alkaline agent and amino acids, etc., and capable of exhibiting excellent bleaching effects on persistent dirt of mud, iron rust, etc., sticking to clothes, etc. CONSTITUTION:The aimed composition obtained by containing (A) thiourea dioxide, (B) an alkaline agent and (C) a bleaching improver selected from the group consisting of (i) amino acids, such as aspartic acid, crysteine, histidine, arginine, glutamic acid, tryptophan, (hydroxy)proline or water-soluble inorganic salts thereof, (ii) amines, such as triethylenetetramine 2,2',2''-triaminotrime thylamine or histamine, and (iii) pyridinecarboxylic acids, such as pyridine-2- carboxylic acid, pyridine-2,6-dicarboxylic acid or water-soluble inorganic salts thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a bleach composition containing thiourea dioxide and an alkaline agent as a bleaching base, which removes stubborn mud stains and iron rust attached to clothing, etc. This invention relates to a reducing bleach composition that exhibits an excellent bleaching effect on stains and the like.

Bleach is widely used to bleach clothing, prevent yellowing, and remove rust from fully folded products. Bleaching agents are broadly classified into reducing bleaching agents and oxidizing bleaching agents, and oxidizing bleaching agents are widely used because of their superior bleaching effect. However, oxidizing bleaches have a low bleaching effect on mud stains and iron rust stains, and are not necessarily satisfactory.

Therefore, attempts have been made to use reducing bleaching agents for stains that cannot be bleached with oxidizing bleaching agents, and many proposals have been made and have been put into practical use. Examples of reducing bleaches include hydrosulfides, sulfites, and thiourea dioxide.

Reducing agents that exhibit a reducing effect directly or indirectly, such as Rongalit (formaldehyde sulfinic acid), ascorbic acid, hydroquinone, oxalic acid, and thioglycolic acid, are used.

As household reductive bleaching agents, those containing thiourea dioxide as a main agent are widely used in terms of bleaching effect, usability, storage stability, safety, cost, etc. Thiourea dioxide does not exhibit reducing properties by itself, but is often used in combination with an alkaline agent to exhibit reducing properties.

There have been many proposals regarding bleaching compositions and bleaching methods using thiourea dioxide as a main ingredient.
7-128767 discloses a reducing agent composition comprising thiourea dioxide, anhydrous alkali metal carbonate or trialkali metal phosphate anhydride, and anhydrous alkali metal bicarbonate.

However, conventional proposals for thiourea dioxide-based bleaches have been proposed because the thiourea dioxide/alkaline agent system is unstable.
It is used for the purpose of improving its storage stability, or is simply used as an auxiliary agent by adding it to detergents to improve their cleaning power. Although these bleach compositions have a bleaching effect on light stains such as iron stains, they are insufficient in their bleaching effect on stubborn deep iron stains and mud stains.

Purpose of the Invention The purpose of the present invention is to enhance the bleaching effect of a bleaching agent containing thiourea dioxide/alkaline bleaching base, and to exhibit an excellent removal effect on stubborn iron stains and mud stains. do.

Constitution of the Invention The bleach composition of the present invention is characterized by containing the following components (A), (B), and (C).

(A) Thiourea dioxide.

(B) Alkaline agent.

(C) A bleach enhancer selected from the group of compounds shown in (a) to (c) below.

(a) Amino acids: aspartic acid, cysteine, histidine, arginine, glutamic acid, tryptophan, proline, hydroxyproline, or water-soluble inorganic salts thereof.

(b) Amines nitriethylenetetraamine, 2.2'
, 2'-triaminotrimethylamine or histamine.

(c) Pyridinecarboxylic acids: pyridine-2-carboxylic acid, pyridine-2,6-dicarboxylic acid, or water-soluble inorganic salts thereof.

The present invention will be explained in more detail below.

Component (A), thiourea dioxide, can be produced by a known method using thiourea and hydrogen peroxide as raw materials; and can be easily obtained.

The appropriate amount of thiourea dioxide (A) in the bleach composition of the present invention is 3 to 30% by weight, preferably 5 to 2% by weight.
It is 0% by weight.

Examples of the alkaline agent as component (B) include sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium diphosphate, sodium pyrophosphate, sodium tripolyphosphate, and sodium borate. can be mentioned.

Thiourea dioxide has no reductive bleaching properties by itself and must be used in conjunction with an alkaline agent. (in the composition of the present invention)
B) It is important that the alkaline agent is added in an amount sufficient to maintain the alkalinity of the bleaching bath during the bleaching process.

Component (C) is a bleach enhancer that is added to further enhance the bleaching properties of the thiourea dioxide/alkaline agent system, and includes specific amino acids and amines selected from (a) to (c) above. One or more types of pyridine carboxylic acids are used.

Among component (C), cysteine and pyridine-2,6-dicarboxylic acid are preferred because they provide excellent bleaching effects in a short bleaching time.

The blending amount of component (C) in the bleaching composition of the present invention is (A)
It is desirable to set the ratio of (A) / (Cn = 571 to 1/1 (weight ratio)) to the components. If the amount of component (C) blended is less than 5/1, the effect of improving the bleaching blade will decrease. On the other hand, even if more than 1/1 of the CG') component is blended, the bleaching improvement effect is saturated and does not improve.

The bleach composition of the present invention is obtained by powder-mixing components (A), (B), and (C). Component (C), which is liquid at room temperature, such as triethylenetetraamine and histamine, is impregnated into a suitable carrier and then mixed into powder. As the carrier, sodium carbonate and sodium phosphate, which are alkaline agents of component (B), can be used, and water-soluble inorganic salts such as sodium sulfate, magnesium sulfate, and calcium chloride can also be used.

The reduced bleach composition of the present invention comprises the above (A), (B),
Although component (C) is contained as an essential component, other components can be blended within a range that does not impair the effects of the present invention. Such optional ingredients include surfactants,
Examples include optical brighteners, chelating agents, enzymes, fragrances, colorants, carriers, and bulking agents.6 Surfactants make it easier to wet the object to be treated and promote contact between bleaching active species and dirt. In addition, it is expected that the bleaching effect will be further improved by adding the cleaning effect of the surfactant itself, and it is desirable to incorporate it into the bleach composition of the present invention.

Examples of such surfactants include alkylbenzene sulfonates, α-olefin sulfonates, alkyl a-acid ester salts, anionic surfactants such as soap; polyoxyethylene adducts of higher alcohols, and polyoxyethylene adducts of alkylphenols. Examples include adducts and nonionic surfactants such as sorbitan fatty acid esters. The amount of surfactant blended is not particularly limited, but
A content of 0.1 to 10% by weight in the bleach composition is sufficient.

Chelating agents include sodium citrate, sodium tartrate,
Aliphatic carboxylic acid salts such as sodium gluconate, aminopolycarboxylic acids such as iminodiacetic acid, hydroxyethyliminodiacetic acid, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid, or water-soluble inorganic salts thereof or a salt thereof, and aminopolycarboxylic acid (or a salt thereof) is preferable in terms of chelating ability.

As a fluorescent brightener, 4,4-bis-2-sulfostyryl biphenyl disodium salt (Tinopal CBS-X;
Enzymes include alkaline protease and alkaline cellulase, and carriers include water-soluble inorganic substances such as sodium sulfate and magnesium sulfate.

According to the reducing bleach composition of the present invention, by blending a specific bleach enhancer as component (C) with a bleaching base consisting of thiourea dioxide and an alkaline agent, it is possible to improve It can effectively bleach stubborn mud stains and iron rust stains on clothing such as socks that could not be sufficiently bleached with other methods, and the bleaching base does not deteriorate or decompose, making it storage stable. It has excellent properties and high practical value.

The bleach composition of the present invention can be used not only as a bleaching agent for ordinary clothes, etc., but also as a rust remover for metal products, as a detergent additive to improve cleaning power when added to detergents, and as a detergent for preventing yellowing of washed items. It can also be used as a remover.

EXAMPLES The present invention will be described below with reference to Examples, but prior to this, a method for testing the bleaching effect used in the Examples will be explained.

Hoshiwata Tsutomu , dehydrate for 5 minutes. Wash and dehydrate using the same procedure again. Next, overflow rinsing is performed for 15 minutes, followed by dehydration for 5 minutes. The overflow rinsing and dehydration operations are repeated a total of 5 times, and then air-dried to obtain a pretreated fabric.

(2) Preparation of contaminated cloth (a) Preparation of yellow-brown iron-deposited contaminated cloth A 300 ppm aqueous solution of ferric chloride is maintained at 25° C., and the above pretreated cloth is immersed in it for 6 hours at a bath ratio of 30 times. During this soaking, the cloth is lightly stirred every 15 minutes to ensure uniform iron deposition on the cloth. After soaking, rinse in a washing machine for 30 minutes to remove excess iron.

Next, the cloth is dehydrated for 5 minutes and then dried by ironing to obtain an iron-stained cloth.

(b) Preparation of mud-contaminated cloth Place 10 g of Mikataga raw mud and 990 g of water in an IQ beaker.
Stir vigorously to thoroughly disperse the mud. Next, a pretreated cloth cut into a size of 10 x 20 cm is immersed in the mud dispersion, sufficiently wetted, and then a roller wringer is used to strengthen the adhesion of the mud. After drying in a dryer at 105° C. for 60 minutes, polish the cloth using a sponge to obtain a mud-stained cloth.

(3) Bleaching treatment The test bleach composition was added to tap water (25°C) at a concentration of 0.
51 and stirred lightly with a glass rod to prepare a bleaching solution, the contaminated cloth was immersed in this bleaching solution at a bath ratio of 100 times and left for 60 minutes. The thus treated test cloth was dehydrated in a washing machine for 1 minute, overflow rinsed for 1 minute, and dehydrated for 1 minute in sequence, and then dried by ironing to obtain a bleached cloth.-0 (4) Bleaching Evaluation of Effects The reflectance of the pretreated cloth, contaminated cloth, and bleached cloth was measured using a photoelectric reflectance photometer (Sigma-Z80, manufactured by Nippon Seishoku Kogyo ■), and the bleaching effect was calculated using the following formula.

Examples include 10% by weight of thiourea oxide, 68% by weight of sodium carbonate,
17% by weight of sodium hydrogen carbonate and (C
) A bleach composition consisting of 5 parts by weight of a bleach enhancer,
Each was prepared by powder blending. Next, a bleaching effect test was conducted using these bleach compositions. The results are shown in Table 1 below.

From the results in Table 1, the bleaching effect of only the bleaching base (experiment Nα14) consisting of thiourea dioxide and alkaline agent (sodium carbonate/sodium hydrogen carbonate) was 8% against iron contamination and 4% against mud contamination. % and has almost no bleaching effect. The compositions of the present invention are all 50% effective against iron contamination.
% or more, and shows a bleaching effect of 40% or more against mud pollution. Especially for cysteine (experiment Nα2), 90% (
(iron contamination), 70% (sludge contamination); histidine (experiment N
α3) shows a high bleaching effect of 80% (iron contamination) and 66% (sludge contamination). On the other hand, the comparative examples of glycine (Experiment & 15) and lysine (Experiment & 16) have extremely low bleaching effects even though they are in the same amino acids as cis9ine and histidine.

Furthermore, ethylenediamine (experiment Nα17) and 1,2-diaminocyclohexane (experiment Nα18) are amine compounds, but they have almost no bleaching effect. It can be seen that an excellent bleaching effect on stubborn mud stains and iron stains can be obtained only when the specific bleach improver of the present invention is used in combination.

(The following is a blank space) Example 2 Various bleach compositions were prepared with the compositions shown in Table 2, and a bleaching effect test was conducted in the same manner as in Example 1. Second result
Shown in the table.

The results in Table 2 show that all of the bleach compositions of the present invention have excellent bleaching effects.

(Margin below)

Claims (1)

[Claims] 1. A bleach composition characterized by containing the following components (A), (B) and (C): (A) thiourea dioxide; (B) an alkaline agent; (C) ) A bleach enhancer selected from the group of compounds shown in (a) to (c) below. (a) Amino acids: aspartic acid, cysteine, histidine, arginine, glutamic acid, tryptophan,
Proline, hydroxyproline or water-soluble inorganic salts thereof, (b) Amines: triethylenetetraamine, 2,2'
, 2''-triaminotrimethylamine or histamine; (c) Pyridinecarboxylic acids: pyridine-2-carboxylic acid, pyridine-2,6-dicarboxylic acid or water-soluble inorganic salts thereof.