JPH01138299A - Liquid washing aid - Google Patents

Abstract

PURPOSE:To obtain a liquid washing aid excelling in bleaching and deterging power and storage stability and exhibiting an excellent washing effect when used in combination with an alkali detergent, by dissolving and/or suspending hydrogen peroxide, a surfactant and specified particles in an aqueous medium. CONSTITUTION:99-50wt.% normally solid organic peroxide precursor (a) (e.g., tetraacetylethylenediamine) and 1-50wt.% normally solid 10-20C fatty acid (b) (e.g., lauric acid) are melt-blended and pelletized to obtain particles of a particle diameter of 10-5000mu. Said powder in an amount to give 0.5-50wt.% component (a) is dispersed and suspended in an aqueous medium containing 0.5-10wt.% hydrogen peroxide and 0.01-50wt.% surfactant (e.g., branched alkylbenzenesulfonate), and an acid is added to this dispersion to adjust its pH to 2-5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liquid laundry aid, and more particularly to a liquid laundry aid that provides excellent cleaning effects when used in combination with alkaline detergents.

[Conventional technology]

In recent years, many so-called spray-on laundry pre-treatment agents, in which liquid detergent is placed in a coating container, have been put on the market for removing stains from collars and cuffs, or for removing stains. This pre-treatment agent is quite popular because it can improve the cleaning effect just by applying it before loading it into the washing machine. However, commercially available products use regular heavy-duty liquid detergent for laundry, so for heavily soiled items, simply applying the product may not be effective enough, so you may need to scrub it with a brush or further remove the detergent. Currently, bleaching treatments are being applied.

On the other hand, it is also known to improve the washing and bleaching effect by using a liquid hydrogen peroxide bleach together with a detergent, or by applying it to clothing and then adding it to the detergent solution. Hydrogen peroxide bleach compositions used in this manner include, for example:
A composition stabilized by blending an ammonium salt, a soluble stannate, and an organic acid into an aqueous hydrogen peroxide solution and adjusting the pH to 0.5 to 7 (JP 49-52784 A), peroxide Contains hydrogen, a nonionic or anionic surfactant, and a complex of a magnesium compound and an acid, p11
A composition in which decomposition of hydrogen peroxide is suppressed having 4 to 6 (
JP-A No. 54-10309), contains hydrogen peroxide, an acid, a nitrogen-containing compound, a dye, and an optical brightener, and has a pH of 1,
8 to 5.5 (Japanese Unexamined Patent Publication No. 55-108
500), a storage-stable low-temperature active composition in which a solid peroxide precursor peroxide is dispersed in an acidic aqueous solution of hydrogen peroxide (Japanese Patent Application Laid-open No. 62-230897), and the like have been proposed.

[Problem that the invention seeks to solve]

As seen in the prior art mentioned above, hydrogen peroxide-based liquid laundry aids (hydrogen peroxide acidic liquid bleach itself has a weak bleaching blade and only shows good bleaching and cleaning power when used in combination with an alkaline detergent. The stability of hydrogen peroxide is a problem when using hydrogen peroxide as an auxiliary agent. In a system containing a hydrogen peroxide activator, the bleaching strength is enhanced, but the storage stability is naturally impaired.

The technique disclosed in JP-A No. 62-230897 claims that a storage-stable product can be obtained by dispersing a solid activator in an aqueous hydrogen peroxide solution. A storage-stable product could not be obtained using the most readily available and commonly used solid activators such as tetraacetyl glycoluril and phthalic anhydride.

c. Means for Solving Problems] The present inventors have conducted extensive research to obtain a hydrogen peroxide-based liquid laundry aid that has excellent bleaching and cleaning power in laundry liquid and is storage stable using an activator. As a result, the inventors discovered that it is sufficient to suspend particles obtained by mixing and granulating an activator with a fatty acid that is solid at room temperature, and completed the present invention.

That is, the present invention provides a liquid cleaning aid containing hydrogen peroxide and a surfactant in which particles obtained by mixing and granulating an organic peracid precursor that is solid at room temperature and a fatty acid that is solid at room temperature are mixed and granulated in an aqueous medium. The present invention provides a liquid laundry aid characterized by being dispersed and suspended and having a pH adjusted to 2 to 5.

In the present invention, hydrogen peroxide is usually contained in the composition at 0.0%.
It is blended in an amount of 5 to 10% by weight.

Surfactants used in the invention include, for example, straight or branched alkylbenzene sulfonates, alkyl or alkenyl ether sulfates, alkyl or alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated Fatty acid salts, carboxy or sulfohetaine type surfactants, polyoxyalkylene alkyl or alkenyl ethers, polyoxyethylene alkylphenyl ethers, higher fatty acid alkanolamides or their alkylene oxide adducts, sucrose fatty acid esters, fatty acid glycerin monoesters, alkylamine oxides, Examples include pluronic surfactants, sorbitan fatty acid esters, and ethylene oxide adducts thereof. The surfactant is contained in the composition in an amount of 0.01~
It is blended in an amount of 50% by weight, preferably 1 to 20% by weight.

The organic peracid precursor used in the present invention may be solid at room temperature and is not limited to a specific one, but preferred examples include tetraacetylethylenediamine,
Examples include glucose pentaacetate, tetraacetyl glycoluril, and phthalic anhydride. The amount of organic peracid precursor is usually from 0.5 to 50% by weight or from 1 to 30% by weight in the composition.

The fatty acid is not limited to any particular one as long as it is solid at room temperature, but fatty acids of C1° to CZO are preferred. - Examples of substances used in boat fishing include lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, valmitic acid, margaric acid, stearic acid, and nonadecanoic acid. The amount of fatty acid in the granules is preferably 1 to 50% by weight.

Although the granulation method is not limited, it is usually easily obtained by melting a fatty acid and mixing it with an organic peracid precursor powder. The particle diameter of the granulated material is preferably in the range of 10 to 500 pμ, more preferably in the range of 100 to 500 μ.

The compositions of the present invention include, as other optional ingredients, a hydrogen peroxide stabilizer such as ethylenediaminetetraacetate;
Polymer thickeners such as carboxymethyl cellulose, inorganic thickeners such as montmorillonite, fragrances, colorants, fluorescent dyes, etc. can be blended. p)l of the composition of the present invention can be modified by inorganic or organic acids. Adjusted to a range of ~5.

〔Effect of the invention〕

The liquid cleaning aid thus obtained has good storage stability and exhibits good bleaching and cleaning effects when used in combination with alkaline detergents.

〔Example〕

The present invention will be described below with reference to Examples, but the present invention is not limited to these Examples.

A product of the present invention and a comparative product having the formulation shown in Table 1 were prepared, and the following tests were conducted.

(1) Evaluation method of bleaching effect ■ Treatment by immersion Black tea contaminated cloth prepared for bleaching test 10cm x 10c
(produced by the following adjustment method) 1 g of the detergent or laundry aid shown in Table 1 was applied to each sheet, and 0.8% commercially available washing liquid (
10.5) at 20° C. for 30 minutes. At this time, the bleaching rate (%) was calculated using the following formula using the reflectance change at 460 nm.

×100 ■ Treatment with a washing machine One piece of tea-stained cloth coated with a detergent or laundry aid in the same manner as in ■ ■ was washed with a 0.133% commercially available detergent solution (PL+!10.
2) Mini washing machine (National Mini)
Washed with Mini, liquid volume 71) for 15 minutes. The bleaching rate was calculated using the above method.

(Black tea contaminated cloth) Boil 80g of Nitto black tea (yellow package) in 31 ion-exchanged water for about 15 minutes, then strain it through desized dry cotton cloth. Soak cotton training camp #2003 cloth in this solution and boil for about 15 minutes. . The sample was removed from the heat, left to stand for about 2 hours, air-dried, washed with water until the washing solution became colorless, dehydrated, and pressed to form a 10 cm x locm test piece for use in experiments.

(2) Evaluation of Collar Stain Cleaning Power According to the method of JiS K-3371, based on JiS index detergent cleaning, after applying the cleaning agents or laundry aids shown in Table 1, the cloths were washed with JiS index detergent and evaluated. K-3
Evaluation was performed using the evaluation criteria of 371,586 (2), and for those with significant differences, the detergency was expressed using the following criteria.

◎: The average value of runout is +0.5 or more ○ /
/ +Q, 2~+0.5△ //
+ 0, less than 2 or no significant difference
The amount of effective oxygen in the sample after storage was measured, and the residual rate of effective oxygen was calculated using the following formula.

■Efficacy search before saving

Claims (1)

[Claims] 1. In a liquid laundry aid containing hydrogen peroxide and a surfactant, particles obtained by mixing and granulating an organic peracid precursor that is solid at room temperature and a fatty acid that is solid at room temperature are dispersed in an aqueous medium. A liquid laundry aid characterized by being suspended and having its pH adjusted to 2 to 5. 2. Claim 1, wherein the organic peracid precursor is tetraacetylethylenediamine, glucose pentaacetate, tetraacetylglycoluril, or phthalic anhydride.
Liquid laundry aids as described in section. 3. The liquid laundry aid according to claim 1, wherein the fatty acid has 10 to 20 carbon atoms.