JPS61195199A - Reducing agent 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] [Industrial application field] The present invention relates to reducing agent compositions.

More specifically, the present invention relates to a household reducing agent composition that can easily bleach colored stains on clothing under mild conditions and has excellent long-term storage stability.0 [Prior Art] Today, the bleaching agents widely used for household use are sodium hypochlorite and sodium percarbonate, but due to their properties,
The drawback is that some types of fibers can seriously damage the fibers, and that the bleaching effect is extremely poor depending on the type of stain. However, when animal fibers such as wool and silk are treated with both bleaches, they actually turn them yellow. Furthermore, both bleaches have insufficient or no effect on yellowing of clothes caused by iron rust in tap water and mud stains containing iron compounds.

It is known that reducing bleaches (conventional) are effective against such textile stains, but thiourea dioxide (hereinafter abbreviated as TUD) has poor reducing power and storage stability. Considering this, it is most suitable as a household reducing bleach.

[Problem that the invention seeks to solve]

TUD is an odorless white powder and is a stable reducing bleach with almost no deterioration under normal conditions. TUD is comprehensively superior in terms of storage stability and reducing power compared to reducing bleaches such as hydrotinite, formaldehyde sodium sulfonate dihydrate (Rongalit), and acidic sodium sulfite. Therefore, it is widely used today for bleaching fibers and paper pulp, as an antioxidant for organic compounds, in the photographic industry, as a polymerization catalyst, etc. In particular, in the textile industry, it is used as a reducing agent for bleaching silk and wool, dyeing such as vat dyes, and a reducing cleaning agent for disperse dyes (Tokai Denka Kogyo Co., Ltd. (Higashi, see product catalog ``Chic Light'')).

However, the bleaching conditions using TUD in the textile industry are usually at a high temperature of 80 to 90°C and a small amount of caustic soda is added. It is judged to be undesirable when handling safety is considered. Furthermore, under the above treatment conditions, the bleaching effect on stains containing iron compounds is insufficient.

Some conventional techniques related to reducing agent compositions using TUD are found in patents etc. (Japanese Patent Publication No. 49-5811, JP-A-57-75099, JP-A-57-12876)
No. 5, JP-A-57-128766, JP-A-Sho 5
However, the bleaching effects of the blended compositions described in these patents are still not sufficient.

In other words, it is difficult to quickly remove iron rust and mud stains at relatively low temperatures as intended by the present inventors using a system in which an alkaline agent or an aminocarboxylic acid salt is blended with TUD.

The object of the present invention is to provide a bleach composition that can bleach not only animal fibers but all fibers, exhibits excellent effects on stains containing iron compounds, and has good long-term storage stability. The goal is to provide the following.

[Means for solving problems]

In order to improve the bleaching effect of TUD, the present inventors have conducted intensive studies on its composition, and have found that by blending a specific acid with TUD, sodium carbonate, and an aminocarboxylate, a significantly higher bleaching effect can be obtained. They found an effect. The effect of this particular acid is thought to be acting as a regulator to maintain optimal pH in the bleaching solution;
There are also things that cannot be explained by that alone, which have never been separated from Hatsukishi.

In addition, the composition containing this specific acid has excellent long-term storage stability and does not cause any odor, yellowing, or caking after long-term storage.

The reducing agent composition of the present invention has TUD as an essential component,
It contains an aminocarboxylic acid salt, sodium carbonate, and a specific acid.

TUD of the present invention, aminocarboxylic acid salt, carbonic acid) IJ
A reducing agent composition containing a specific acid has a liquid temperature of 20 to 5
Since it has an excellent bleaching effect under relatively mild conditions such as 0°C and pH 7 to 10, it poses no danger to ordinary housewives when handling it.

The aminocarboxylic acid salts used in the present invention are, for example, alkali metal salts of the following compounds.

Ethylenediaminetetraacetic acid (KDTA), nitrilotriacetic acid, hydroxyethylethylenediamine triacetic acid powder (azD
T*), diethylenetriaminepentaacetic acid (DTPA)s
) Liethylenetetraminehexaacetic acid, hydroxyethyliminodiacetic acid, dihydroxyethylchrysine (DIG),
Ethanolglycine, jetanolglycine. Among these compounds, particularly preferred are ethylenediaminetetraacetic acid and hydroxyethylethylenediaminetriacetic acid.

The sodium carbonate used in the present invention is commonly called soda ash, and there are two types: heavy ash and light ash.
Retranslation is preferable from the viewpoint of caking resistance in storage stability and prevention of generation of fine powder.

The specific acid used in the present invention refers to any one of tartaric acid and sulfamino acid, or any combination thereof. When clothing is bleached using the reducing agent composition of the present invention containing these acids, the pH of the bleaching solution can be adjusted to a desired value, and the pH before and after bleaching can be maintained relatively stable. As a result, excellent bleaching effects can be achieved. Here, the desired pH is in the range of 7 to 11, preferably 8 to 10.

Next, the blending amount of the component 41!11 constituting the reducing agent composition of the present invention in the reducing agent composition will be explained. The amount of TUD blended is 3 to 60% by weight (hereinafter abbreviated as %), preferably 10 to 30%.

The amount of the aminocarboxylic acid salt contained in the composition is 1 to 50%, preferably 5 to 35%. The amount of sodium carbonate is 5 to 80%, preferably 20 to 50%. The blending amount of the above-mentioned specific acid is 5 to 50%, preferably 10 to 40%. In addition, in order to fully exhibit the bleaching effect, the combined amount of K (sodium carbonate and the above-mentioned specific acid) should be at least 1/2 or more, preferably 3 times or more, relative to the amount of TUD. It is preferable that there be.

The individual formulations have been described above, but in order to obtain excellent storage stability, IJ
cum and the specific acid are each preferably anhydrides.

Further, the following anionic, nonionic, and amphoteric surfactants can be blended into the composition of the present invention as required.

Alkylbenzene sulfonate, α-olefin sulfonate, alkyl sulfate salt, polyoxyethylene alkyl ether sulfate salt, fatty acid salt, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, fatty acid amide, fatty acid amide ethylene oxide addition substances, alkyl amine oxides, imidazolium betaines, alkyl betaines.

〔Example〕

The present invention will be described in detail with reference to Examples below, and the experimental conditions on each side are as follows.

a. Preparation of bleach-stained cloth from iron-sealed contaminated cloth is as follows. In National Mini Mini Washing Machine Model Nmu 52, ferric chloride 2.8F water 7! and neutralize with sodium hydroxide. Gold purse (Yu ratio 1
:30) was added and stirred to adhere insoluble ferric hydroxide. The fabric was rinsed, dehydrated, and dried with an iron. The fabric had an intermediate whitening value of 45±2 measured by a color difference meter and was treated as a contaminated fabric.

Bleaching conditions were as follows: 2.5r of the reducing agent composition was dissolved in 500ml of water, and the solution was immersed at 40°C for 10 minutes. The bleaching rate was calculated using the following formula.

Ro: White discoloration of cloth before contamination R8: White discoloration of contaminated cloth RW: White discoloration of bleached cloth, bleaching of mud-stained cloth After heating and drying Akadama soil, a commercially available horticultural soil, pulverizing it and sifting it, National 20 tons of mud and 5 liters of water in the mini-mini washing machine NA-32! , add a cotton knitted cloth, and perform rinsing with stirring twice for 3 minutes to create a uniformly contaminated cloth. Bleaching conditions are the same as in item a, bleaching iron-stained cloth. The 6b value was determined using a color difference meter, and the bleaching rate was determined using the following formula. Wear your wool sweater for a few days and then wash it with a mild wool detergent. By repeating this operation 10 times, a part of the yellowed sweater obtained was cut out and used as a test cloth.Bleaching conditions and calculation of bleaching rate are as follows.In the case of bleaching muddy cloth It is similar to

d. Storage stability test The reducing agent composition was placed in a polyethylene sample bottle, left at room temperature for 3 months, and changes in color, odor, and caking were examined. The evaluation criteria for odor and caking are as follows.

Odor evaluation criteria ○...No odor or almost no off-odor Δ...Obviously off-odor ×...Kana strong off-odor Caking evaluation criteria ○...No or almost no caking Δ...Partial X where the entire portion is caked...Examples 1 to 6 where the entire portion is caked. Comparative Examples 1 to 7 Table 1 shows the bleaching effects of three types of cloth when each reducing agent composition was used. As a result, the bleaching effect of the composition that did not contain the aminocarboxylate or a specific acid was inferior (Comparative Example 1.2)0 In addition, other sequestering agents were mixed in place of the aminocarboxylate. The bleaching effect of the compositions of the present invention was poor (Comparative Examples 3, 4.5); on the other hand, the bleaching effect of the compositions of the present invention was excellent (Examples 1 to 6).

Table 2 shows the storage stability results of each reducing agent composition.

The storage stability of compositions using citric acid or boric acid as the specific acid was poor (Comparative Example 6.7). In contrast, compositions using sulfamino acid or tartaric acid as the specific acid had excellent storage stability.

Claims (1)

[Claims] As an essential component, Thiourea dioxide 3-60% by weight, aminocarboxylic acid salt 1 to 50% by weight, 5-80% by weight of sodium carbonate, Tartaric acid or (and) sulfamic acid 5-50% by weight A reducing agent composition comprising: