JPS60139799A - Bleaching agent - 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 bleaching agent, and more specifically, to a bleaching agent containing an alkali metal salt of an inorganic peracid that has significantly improved bleaching performance, such as having an excellent bleaching effect even in low-temperature water. .

Conventionally, alkali metal salts of inorganic peracids such as alkali metal carbonates and boric acid peroxides have been used as bleaching agents because they exhibit bleaching performance by releasing hydrogen peroxide in aqueous solutions. However, these alkali metal salts of inorganic peracids have a drawback in that their bleaching performance is low at low temperatures and a sufficient bleaching effect cannot be obtained.

In order to enhance the bleaching performance of such an alkali metal salt of an inorganic peracid, a method has been proposed in which, for example, an organic carboxylic acid ester is used in combination (US Pat. No. 2,955,905). In this method, specific examples of alkali metal salts of inorganic peracids include perborates, percarbonates, perbyrophosphates, and persilicates, and specific examples of organic carboxylic acid esters include acetic acid. Examples include esters of benzoic acid and phenols, alcohols, and vicinal polyols.

However, the combined use of these carboxylic acid esters
Although this effect is expected at a relatively high liquid temperature of 50 to 60°C, there is a problem in that the desired bleaching efficiency cannot be obtained at liquid temperatures such as normal tap water or well water.

As a result of intensive research to provide a bleaching agent containing alkali metal salts, we quickly discovered that a combination of an alkali metal salt of an inorganic peracid and acetylated lignin sulfonate was suitable for the purpose of cleaning scales. Based on this, the present invention was completed.

That is, the present invention provides a bleaching agent containing an alkali metal salt of an inorganic peracid and an acetylated lignin sulfonate.

The alkali metal salts of inorganic peracids used in the bleaching agent of the present invention include percarbonates, perborates, perpyrophosphates, persilicates, etc., which release hydrogen peroxide in aqueous solution. If so, they can be used without particular restrictions, and sodium salts and potassium salts are suitable as alkali metal salts.

Specific examples of the alkali metal salts of the inorganic peracids include sodium percarbonate, potassium percarbonate, sodium perborate, etc. Among these, those that release hydrogen peroxide in neutral or alkaline conditions are particularly preferred. preferable.

Acetylated lignin sulfonate, which is another essential component in the bleaching agent of the present invention, can be obtained by reacting lignin sulfonate with acetic anhydride in a conventional manner, for example using an acid catalyst.

The degree of acetylation of this acetylated lignin sulfonate is preferably 40 moles or more relative to the acetylatable active hydrogen of the lignin sulfonate, that is, the sum of the alcoholic hydroxyl group and the phenolic hydroxyl group, More preferably, it is 50 molti or more. If the degree of acetylation is low, the bleaching performance of the bleaching agent will not be sufficiently improved.

The degree of sulfonation of the lignin sulfonate is not particularly limited as long as it exhibits water solubility, but it is 90.1 or more per basic skeleton, that is, 0.1 per benzene nucleus.
Those containing one or more sulfone groups are preferred.

Such acetylated lignin sulfonate.

It may be a single compound or a mixture of compounds having different degrees of sulfonation, degrees of acetylation, and counterions. However, the acetylated lignin sulfonate exhibits sufficient performance when dissolved in water, so in the case of a mixture, the content of water-insoluble substances is small. Preferably, at least half of the acetylated lignin sulfonate is water-soluble. Further, as the salt, alkali metal salts and alkaline earth metal salts are suitable, and sodium salts and potassium salts are particularly suitable.

In the bleaching agent of the present invention, the blending ratio of the acetylated lignin sulfonate is 100 parts by weight of the alkali metal salt of inorganic peracid, preferably 20 to 400 parts by weight, more preferably 40 to 200 parts by weight. is within the range of If the blending ratio is less than 20 parts by weight, the bleaching performance will not be improved sufficiently, while if it exceeds 400 parts by weight, the bleaching performance will not be improved much, but rather deteriorates.

In addition, the lignin sulfonate used as a raw material for acetylated lignin sulfonate is
Normally, reducing sugars, sugar modified products, inorganic salts, etc. are contained, but since these have virtually no adverse effects, there is no need to prepare them into silk, and they may be acetylated as they are. The obtained acetylated lignin sulfonate containing impurities can be used as it is in the bleaching agent of the present invention.

The bleaching agent of the present invention is prepared by, for example, preparing a powder mixture obtained by separately powdering the alkali metal salt of the inorganic peracid and the acetylated lignin sulfonate and then mixing them, which are each separately powdered and then granulated.

A mixture of granules obtained by mixing these granules, a powder mixture obtained by pulverizing each of them separately and then mixing them, or a powder mixture obtained by mixing the three above and pulverizing them in advance can be produced. It is preferably used in the form of powder or granules such as granules.

The bleaching agent of the present invention may optionally contain a filler such as a water-soluble inorganic salt in addition to the above-mentioned essential components.

When preparing the granules, a binder such as a water-soluble polymer substance or other additives may be added. - The bleaching agent of the present invention has improved bleaching performance by combining an acetylated lignin sulfonate with an alkali metal salt of an inorganic peracid, and is particularly suitable for use with low-temperature water such as tap water or well water. When used, it exhibits remarkable effects.

The bleaching agent can be used as it is, or can be blended into a powdery detergent as a bleaching action imparting component.

When the bleaching agent of the present invention is used as is, the alkali metal salt of the inorganic peracid is preferably contained in the bleaching agent at a concentration of 20 to 80%.
It is desirable that the content be in the range of 30 to 70% by weight, more preferably 30 to 70% by weight. In addition, when the bleaching agent is blended into a powder or granular detergent as a bleaching ingredient, it should be blended so that the alkali metal salt of the inorganic peracid is contained in the detergent in a range of 1-10% by weight. is preferred.

Next, the present invention will be explained in more detail with reference to Examples.

Production example Production of acetylated lignin sulfonate Lignin sulfonate (trade name Vanillex, sulfonic acid group per benzene nucleus 0.13, hydroxyl value 245
)10F and acetic anhydride 4.45'7 (equimolar to the active hydrogen of lignin sulfonate) in benzene 50i
and further added 0.51 g of concentrated sulfuric acid and reacted at 60° C. for 3 hours. No unreacted acetic anhydride was detected in the reaction-completed solution. This reaction-completed liquid was filtered and washed with ether to obtain a genin sulfonate having a degree of acetylation of 100%.

Acetylated lignin sulfonate was synthesized in the same manner.

Example 1 0.0% sodium percarbonate in 100 parts by weight of ion-exchanged water.
05 parts by weight and 0.05 parts by weight of various activators as shown in Table 1
After adding parts by weight, the contaminated cloth for bleaching test was immediately immersed and left at 40°C for 10 minutes.

Next, the bleached cloth was washed with water, air-dried, and the reflectance after bleaching was measured.The bleaching efficiency (unit: %) was calculated based on the following formula, and the improvement in bleaching performance due to the activator was evaluated. The results are shown in Table 1.

However, A: Reflectance of the cotton cloth used to prepare the contaminated cloth B: Reflectance of the contaminated cloth before bleaching C: Reflectance of the contaminated cloth after bleaching.

The contaminated cloth for the bleaching test was prepared by putting a cotton cloth in an aqueous black tea solution, boiling it, air drying it, and washing it with water.

It can be seen from Table 1 that the bleaching agent of the present invention /163,4.5 has excellent bleaching performance.

Example 2 A cleaning solution obtained by fermenting powdery detergent to a concentration of 0.133% by weight based on tap water was added with 5% by weight of sodium percarbonate and 5% by weight of sodium percarbonate based on the detergent. 2 Add the activator shown in Table 2, and use a turbotometer to
The bleach test contaminated cloth was washed for 10 minutes at 5°C. The results are shown in Table 2.

The method for measuring bleaching efficiency and the contaminated cloth for bleaching tests were the same as in Example 1.

,・'\' Table 2 From Table 2, it can be seen that the bleaching agent 1611.12.13 of the present invention has poor bleaching performance.

Patent applicant Lion Corporation Agent Akira Agata

Claims (1)

[Claims] 1. A bleaching agent containing an alkali metal salt of an inorganic peracid and an acetylated lignin sulfonate. 2. The bleaching agent according to claim 1, wherein the degree of acetylation of the acetylated lignin sulfonate is 40 molti or more.