JPS6362442B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a stabilized composition of sodium percarbonate, which is widely used as an oxygen bleaching agent. Sodium percarbonate is widely used, especially as a household bleaching agent, but it is also used as a cleaning agent, slime remover, oxygen generator, disinfectant, etc. Soda percarbonate is a type of oxygen-based bleach, and although oxygen-based bleach has weaker bleaching power than chlorine-based bleach, it does not cause fading of dyed products, especially dyed fabrics.
It also has the advantage of not causing yellowing of chemical fibers, is affordable, and is widely used for home use. Other oxygen-based bleaches include sodium perborate, which is widely used in Europe and America. However, sodium perborate has a high operating temperature of 60°C or higher, and the Japanese custom of doing laundry, bleaching, etc. with water at a low temperature of 40°C or lower makes it difficult to use sodium percarbonate, which does not require a high operating temperature. Liked,
In addition to being consumed in large quantities, it does not pollute wastewater and has a favorable effect in terms of pollution prevention. However, sodium percarbonate has the drawbacks of poor stability against moisture and instability against builders of detergents, especially zeolites and the like in the builders. For this reason, large quantities of bleach-containing detergents are sold and used in Europe and America, but their development has been delayed in Japan. Conventionally, inorganic magnesium compounds such as magnesium sulfate, magnesium chloride, and magnesium carbonate have been known as stabilizers for hydrogen peroxide, which is a component of sodium percarbonate. It is still not sufficient in terms of stabilizing effect. Here, as a result of intensive research, the present inventors found that
We have discovered a novel stabilizer with a high stabilizing effect on sodium percarbonate, and completed the present invention. That is, the present invention uses sodium percarbonate as (a) an alkali metal salt or calcium salt of an aromatic hydrocarbon sulfonic acid, (b) an alkali metal salt of a sulfuric ester of an ethylene oxide adduct of an alkyl aromatic hydroxy hydrocarbon, or (c) an alkali metal salt or a calcium salt of a sulfuric ester of an aliphatic higher alcohol; and (d) an alkali metal salt or a calcium salt of a sulfuric ester of an ethylene oxide adduct of the higher alcohol. A stabilized sodium percarbonate composition coated with a compound is provided. Furthermore, the present invention may optionally include the following compounds in the above () group (hereinafter referred to as () group compounds):
The present invention provides a stabilized sodium percarbonate composition comprising a mixture of alkali metal or alkaline earth sulfates or hydrochlorides. A sodium percarbonate composition coated with a compound of group () shows an excellent stabilizing effect, but it is possible to coat sodium percarbonate with a mixture of a compound of group () and a compound of group (). This makes it possible to obtain further stabilizing effects, economy, and safety when put into practical use. Examples of the compounds in ()(a) above include benzene, toluene, xylene, ethylbenzene, kyumene,
Alkali metal salts or calcium salts of sulfonic acids such as naphthalene, or alkali metal salts or calcium salts of such compounds substituted with straight or branched chain alkyls known to have surface activity can be used. However, as the alkyl group in the side chain of such hydrocarbons, carbon atoms in the middle range from the above C ₁ and C ₂ alkyl groups to about C ₁₈ , which is usually used as the side chain alkyl group in the above surfactants. Compounds having a certain number, such as a C ₆ hexyl group or a C ₁₂ dodecyl group, can also be preferably used. The compound of ()(b) has a carbon number of approximately C ₆ to C ₁₄
A sulfate ester salt of an ethylene oxide adduct of an aromatic hydroxy compound having a side chain of an alkyl group of a certain degree is preferably used, such as an alkali metal salt or a calcium sulfate ester of nonylphenol polyoxyethylene ether or octylphenol polyoxyethylene ether. Salt etc. can be used. Furthermore, in addition to the above, compounds in which the aromatic nucleus of the above compounds is substituted with a sulfone group can be used. Further, as the polyoxyethylene group, one having about 2 or more oxyethylene units is used as usual. The higher alcohol used in the compound of ()(c) may be any of natural higher alcohols with _C6 or higher and made from animal and vegetable oils and fats, synthetic higher alcohols produced by the oxo method, and Ziegler method, and synthetic secondary alcohols. Compounds can also be preferably used in the present invention. As the compound ()(d), an alkali metal salt or calcium salt of a polyoxyethylene ether sulfate ester of a higher alcohol is used like the compound ()(c). As the polyoxyethylene group, one having a polymer chain of C ₂ or more is used as usual. As the compounds of group (), alkali metal salts or alkaline earth sulfates and hydrochlorides are used, and as the alkali metals, sodium and potassium are used, and sodium sulfate and calcium sulfate are particularly preferably used. In the stabilizer used in the present invention, when a compound of group () is used or when a compound of group () is used in combination, the latter shows a synergistic effect due to the combination of the two and is superior to the former. The effect can be shown. In this case, the compounding ratio of the compounds of group () and group () is approximately 10:1 to 1:10. In order to obtain the sodium percarbonate stabilized composition of the present invention using the above-mentioned stabilizer, the stabilizer is added as an aqueous solution or an organic solvent solution to the soda percarbonate crystals or granules obtained from the soda percarbonate manufacturing process. It can be obtained by spraying or scattering, mixing and drying. Alternatively, the above stabilizer may be powdered and then added to the soda percarbonate before or after the drying process of the soda percarbonate for coating, using a common mixer. . Any method may be used as long as the stabilizer can be uniformly dispersed. Stabilizer is 1-10% by weight based on soda percarbonate.
used in amounts of The stabilized sodium percarbonate composition of the present invention has an excellent stabilizing effect, the stabilizer used is easily available, and the coating operation can be easily performed, so it is inexpensive, and it can be used with peroxide. It is chemically stable and poses no danger of ignition or abnormal decomposition. Thus, the stabilized composition of the present invention is stable;
It has excellent compatibility with builders, stability against builders, and excellent bleaching power, so it can be used with detergents without adversely affecting the cleaning power or bleaching power, making it an excellent detergent containing bleach. can be obtained. Below, the test results of the stability test of the stabilized composition obtained by the present invention are shown as an example. Examples 1 to 8 1 to 100 g of dry sodium percarbonate crystals
After adding and mixing 10% by weight of the present stabilizer as an aqueous solution, infrared drying was performed to obtain a stabilized sodium percarbonate composition. Table 1 shows the results of measuring the stability of the obtained composition against zeolite. The stability shown in Table 1 shows that after mixing 1 g of synthetic zeolite with 9 g of the obtained sodium percarbonate composition and leaving it for 48 hours under conditions of a temperature of 50°C and a relative humidity of 70%, the residual effective oxygen The ratio was obtained by measuring the ratio by iodometry.

[Table] Example 9 10 parts by weight of the soda percarbonate composition used in Example 4 was blended with 90 parts by weight of a higher alcohol-based heavy powder detergent (commercial product) containing 10% synthetic zeolite and 3% water. The effective oxygen residual rate after being left for 72 hours under conditions of a temperature of 50°C and a relative humidity of 70% was 85.0%. For comparison purposes, the same amount of sodium percarbonate without coating was added to the same detergent, and the effective oxygen residual rate was measured under the same conditions.
It was 62.5%. Examples 10 to 14 2.0 kg of wet granular sodium percarbonate powder having a water content of 11%, obtained by reacting sodium carbonate and hydrogen peroxide in an aqueous solution and centrifuging, was placed in a stirring mixer, and the present stabilizer was added. After adding the following amount as a powder and mixing for 5 minutes, drying was performed, and the resulting sodium percarbonate composition was used under the same conditions as used in the test that obtained the results shown in Table 1 of Example 1. The stability to zeolite was measured. The results are shown in Table 2.

[Table] Examples 15 to 29 An aqueous solution of a stabilizer was sprinkled and mixed with dried sodium percarbonate (13.5% effective oxygen), and then dried at 80°C for 1 hour. After 1 g was mixed and left for 48 hours at a temperature of 50° C. and a relative humidity of 70%, the effective oxygen residual rate was measured by iodometry. 4th result
Shown in the table.

【table】

Claims (1)

[Scope of Claims] 1 Sodium percarbonate (a) an alkali metal salt or calcium salt of an aromatic hydrocarbon sulfonic acid, (b) an alkali metal salt or calcium salt of an ethylene oxide adduct sulfate of an alkyl aromatic hydroxy hydrocarbon (c) an alkali metal salt or calcium salt of an aliphatic higher alcohol sulfate ester, and (d) an alkali metal salt or calcium salt of a sulfate ester of the higher alcohol ethylene oxide adduct. A stabilized soda percarbonate composition comprising: 2. The coating composition according to claim 1,
The sodium percarbonate composition according to claim 1, further comprising an alkali metal or alkaline earth sulfate or hydrochloride.