JPS6129999B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to novel cleaning bleach compositions, and more particularly to cleaning bleach compositions containing sodium percarbonate, sodium carbonate, and certain nonionic activators. Conventionally, stains that stubbornly adhere to solid surfaces such as ceramics cannot be removed using ordinary dishwashing detergents based on surfactants, and sufficient cleaning effects cannot be obtained.
They were chemically bleached using oxidizing agents such as sodium hypochlorite. However, when bleaching with sodium hypochlorite, a characteristic chlorine odor remains not only during use but also often causes discomfort to the user, and research is needed to develop a cleaning bleach that does not have such drawbacks. It is being done. Sodium percarbonate (Na ₂ CO ₃ 3/2
H ₂ O ₂ ), sodium perborate (NaBO ₃
4H ₂ O ₂ ), sodium tripolyphosphate peroxide (Na ₅ P ₃ O ₁₀・H ₂ O ₂ ), sodium peroxide pyrophosphate (Na ₄ P ₂ O ₇・2H ₂ O ₂ ), sodium sulfate/sodium chloride/ Hydrogen peroxide adduct (4Na ₂ SO ₂
Peroxide compounds such as 2H ₂ O ₂ .NaCl) have been proposed, but sodium percarbonate is attracting attention because of its bleaching performance. However, if sodium percarbonate, sodium carbonate as an alkali agent, and a nonionic activator are used together, this also has the drawback of generating an unpleasant odor over time and significantly reducing the commercial value. Therefore, the present inventors conducted intensive studies to improve the above-mentioned drawbacks of cleaning and bleaching compositions containing sodium percarbonate, and found that sodium percarbonate and sodium carbonate contain direct carbon atoms with an average carbon number of 12 to 22. The present invention was completed based on the discovery that a nonionic surfactant containing a chain or branched long-chain alcohol with an average of 10 moles or more of ethylene oxide added thereto would produce a product that does not generate off-flavors. That is, the present invention provides a cleaning bleach composition containing (A) sodium percarbonate, (B) sodium carbonate, and (C) the above-mentioned nonionic activator, and which does not generate any off-odor. In the present invention, nonionic surfactants with an average number of moles of ethylene oxide added of less than 10 moles will generate an unpleasant odor over time, and nonionic surfactants with ethylene oxide added other than those mentioned above, such as polyethylene glycol fatty acid esters, Ethylene oxide adducts of sorbitan fatty acid esters are also undesirable because they generate off-flavors over time. The nonionic activator is preferably blended in an amount of 0.5 to 3% by weight (hereinafter simply referred to as %), particularly 1 to 2.5%, based on the cleaning bleach composition. If it is less than 0.5%, the cleaning effect will be insufficient, and if it exceeds 3%, the cleaning effect will not increase any further, and on the contrary, the stickiness of the blended system will increase and the fluidity of the blended composition will decrease. So I don't like it. Sodium percarbonate, which is the base of the cleaning bleach composition, is 70 to 95%, especially 75 to 90%, because if it is less than 70% of the composition, the bleaching effect tends to decrease.
It is preferable to mix them. Sodium carbonate improves the bleaching effect synergistically with sodium percarbonate, but it is preferably added in an amount of 5 to 30%, particularly 10 to 25%, based on the cleaning bleach composition. When potassium carbonate, which is a similar compound thereof, is used in place of sodium carbonate in the present invention, the hygroscopicity increases and the contents tend to harden if left unopened under high humidity conditions, especially in summer. In addition to the above three components, the cleaning bleach composition of the present invention may optionally contain a hydrogen peroxide stabilizer, such as a water-soluble or water-insoluble magnesium salt such as magnesium silicate, magnesium sulfate, or magnesium chloride; sodium tripolyphosphate; , phosphates such as sodium pyrophosphate and sodium orthophosphate;
Inorganic builders such as sodium silicate and sodium sulfate; sodium ethylenediaminetetraacetate,
An organic chelating agent such as sodium nitrilotriacetate; further, fragrances, pigments, dyes, etc. may be added and blended. Next, an example will be given and explained. In addition, % in examples
All values are percentages by weight. Example 1 Sodium percarbonate 80 (%) Sodium carbonate 18 Straight-chain sec.-alcohol (average carbon number 13) Ethylene oxide adduct 2 Nonionic activators with different numbers of added moles of ethylene oxide and other components were prepared as above. After storing the composition in a hermetically sealed manner at 50°C for 20 days, a sensory evaluation based on odor was performed. The results are shown in Table 1.

[Table] Example 2 A teapot that has been used at home for a long time and is stained with tea stains, etc. is crushed and immersed in a 40°C aqueous solution containing 0.5% of the following composition for 30 minutes. The surface was lightly rubbed with a soft sponge, rinsed with water, and then dried to determine how well the stain had been removed. The results are shown in Table 2. Of course, no chlorine odor was observed in the teapot pieces during soaking or washing.

[Table] (Note) ○ Complete fall
× Incomplete removal Example 3 Sodium percarbonate 75%, sodium carbonate 23%,
A cleaning bleach composition consisting of 0.5% magnesium sulfate and 1.5% lauryl alcohol ethylene oxide adduct with an average of 11 moles exhibited no off-odor even after being left at 50°C for 20 days.

Claims (1)

[Claims] 1. The following essential ingredients: (A) 70-95% by weight of sodium percarbonate, (B) 5-30% by weight of sodium carbonate, and (C) a long-chain alcohol with an average carbon number of 12-22, straight or branched. A cleaning bleach composition containing 0.5 to 3% by weight of a nonionic activator to which 10 moles or more of ethylene oxide is added on average.