JPH0154400B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention has calcium solubility (calcium resistance)
The present invention relates to a good surfactant composition. In recent years, pollution of rivers and lakes has become a problem, and eutrophication of water, which is one of the causes of pollution, has become a focus worldwide. Various measures have been taken to prevent this eutrophication, one of which has focused on phosphates in detergent builders, and there have been efforts to reduce the use of phosphates. In addition, some places have even banned their use, especially in closed water systems. However, calcium in phosphates such as sodium tripolyphosphate has an excellent ability to sequester metal ions such as magnesium, and prevents the formation of water-insoluble anionic surfactants such as calcium and magnesium salts. ,
It has the effect of preventing yellowing and graying of clothing and the formation of soap scum. In addition, it has a great ability to emulsify and disperse dirt, and exhibits excellent effects in preventing re-contamination, so at present no builder has been developed that can replace phosphates. In view of these points, the present inventors have developed calcium solubility, recontamination prevention properties, and
As a result of intensive research aimed at obtaining a surfactant composition with excellent detergency in hard water, a specific polyoxyethylene-based nonionic surfactant was blended with a long-chain alkylbenzene sulfonate in a predetermined ratio. The present invention was completed based on the discovery that a surfactant composition has excellent properties. The present invention is characterized in that the weight ratio of an average of 10 to 130 moles of ethylene oxide adduct of a secondary alcohol having 8 to 20 carbon atoms and a long-chain alkylbenzene sulfonate is in the range of 1:3 to 3:1. This is a surfactant composition with good calcium solubility. As the ethylene oxide adduct with an average amount of 10 to 130 moles of a secondary alcohol having 8 to 20 carbon atoms that can be used in the present invention, a secondary alcohol obtained by liquid phase air oxidation of n-paraffin can be added to a secondary alcohol obtained by a conventional method. A secondary alcohol ethoxylate having 8 to 20 carbon atoms obtained by adding ethylene oxide is used. On the other hand, long-chain alkylbenzene sulfonates include sodium salts, potassium salts, ammonium salts, alkanolamine salts, and monoethanolamine salts of long-chain alkylbenzene sulfonic acids having a linear or branched alkyl group having 8 to 22 carbon atoms. , diethanolamine salt, triethanolamine salt, calcium salt, and magnesium salt. Also, the average of secondary alcohols with 8 to 20 carbon atoms
The ratio of 10 to 130 moles of ethylene oxide adduct and long-chain alkylbenzene sulfonate is 1:3 to 3:1 by weight, and if this ratio is exceeded, the effect decreases and is not preferred. The amount used in the surfactant composition is appropriately selected depending on the purpose, but it is preferably 0.01 to 5% by weight at the time of use. A major advantage of the present invention is that, as mentioned above, calcium solubility is extremely good, so calcium contained in water is not affected by magnesium, that is, by the hardness of water, so it is not affected by magnesium, unlike phosphates. The point is that the composition can have a builder effect by itself without using a builder that promotes eutrophication of lakes and marshes. Therefore, for example, when the present invention is used as a detergent for clothing, a pollution-free detergent that does not contain phosphates can be produced regardless of whether it is used as a powder detergent or a liquid detergent. Furthermore, as calcium solubilizes water-insoluble salts such as magnesium compounds, it is possible to prevent these compounds from adhering to fibers and prevent yellowing and graying of clothing. A further characteristic feature is that it not only maintains its cleaning power regardless of the hardness of the water, but also has the effect of preventing dirt from adhering to clothing from re-adhering to fibers. Although the present invention has many features as described above,
The present invention can be used not only for clothing but also in cases where the production of water-insoluble compounds such as calcium compounds and magnesium compounds is disadvantageous. Examples of these include use for the purpose of preventing scum from adhering to bathtubs and wash basins,
It can be used as a scale inhibitor for boilers, etc. Of course, when carrying out the present invention, other compounds may be used without departing from the scope of the present invention, such as surfactants other than those used in the present invention, organic and inorganic compounds as builders, solubilizers, fragrances, colorants, etc. It goes without saying that it can be used by adding. Next, the effects of the present invention will be specifically explained below with reference to examples. The calcium solubility (calcium resistance) of a surfactant composition consisting of a long-chain alkylbenzene sulfonate and an average of 10 to 130 moles of ethylene oxide adduct of a secondary alcohol having 8 to 20 carbon atoms was investigated. The method for measuring calcium solubility is to use a long-chain alkylbenzene sulfonate with a carbon number of 8 to 20.
An aqueous solution of CaCl2 is added dropwise to 25g of an aqueous solution each containing 0.2% by weight of an average of 10 to 130 moles of ethylene oxide adducts of _secondary alcohols, and the amount of _CaCl2 until it becomes cloudy is converted to the amount of _CaCO3 . It was used as a measure of calcium solubility. Note that the CaCl ₂ aqueous solution and water were alternately dropped so that the final liquid volume was 50 gr, so that the final concentration of the surfactant was 0.1% by weight. Further, the time for dropping the CaCl ₂ aqueous solution and water was approximately 10 minutes. In addition, the number of alkyl carbons in the long-chain alkylbenzene sulfonate (hereinafter referred to as LAS) is
Using Na (sodium) salt of LAS of 12, and an average of 10 to 130 moles of ethylene oxide adduct of secondary alcohol having 8 to 20 carbon atoms,
-14 secondary alcohol ethoxylates (trade name: Softanol, manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.) were used, and polyethylene glycol having no alkyl group was used as a comparative example. Here, calcium solubility is derived from the following formula. Calcium solubility = CaCO ₃ (mg) / (Na salt of LAS + polyoxyethylene nonionic surfactant) (g) These results indicate that the composition according to the present invention provides a composition with extremely excellent calcium solubility. It shows that. Examples 1 to 4 Table 1 was prepared using the surfactant composition shown in Table 1.
The results shown are obtained. Comparative Examples 1 to 2 The results shown in Table 1 were obtained using the LAS Na salt and surfactant composition shown in Table 1.

[Table] Comparative Examples 3 to 8 The results shown in Table 2 were obtained using surfactants made of the LAS Na salt shown in Table 2 and the EO adduct of polyethylene glycol.

[Table] Examples 6 to 7 Table 3 shows the results of examining the detergency in hard water of a surfactant composition consisting of LAS Na salt and softanol EO adduct. The results in Table 3 show that the detergency of the composition according to the present invention is not affected by water hardness, although the detergency of LAS alone decreases depending on water hardness. . The cleaning power measurement method is Terg-O-
Measurements were made using a tometer under the following conditions, and the detergency (DE%) was evaluated by measuring reflectance using a conventional method. Comparative Example 9 Using the LAS Na salt and softanol EO adduct shown in Table 3, the detergency results shown in Table 3 were obtained. Measurement conditions Rotation speed: 100 rpm Washing time, rinsing time: 5 minutes each Washing temperature: 25℃ Contaminated cloth T/C broad artificially contaminated cloth ^* (3 pieces of 10cm x 10cm) Water used: 1 part of pure water, each converted to CaCO ₃
Addition of CaCl ₂ to 50, 200, 400 ppm Cleaning agent concentration Surfactant 0.03% by weight Ratio of LAS and nonionic surfactant 1:1 (weight ratio) Builder ^** 0.09% by weight *Composition of dirt (Weight %) Myristic acid 8.3 Oleic acid 8.3 Tristearin 8.3 Triolein 8.3 Cholesterol 4.4 Cholesterol sniaphosphate 1.1 Paraffin wax 5.5 Squalene 5.5 Carbon black 0.5 Kanto loam soil 49.8 ※※ Builder composition (parts by weight) NaCO ₃ 20 Sodium metasilicate 20 Na ₂ SO ₄ 35 CMC 1 Cleaning power (DE%) = [R _w − R _S / R _O − R _S ] × 100 R _O : Reflectance of original cloth R _S : Reflectance of contaminated cloth R _W : Cleaned cloth reflectance of

[Table] Example 8 Table 4 shows the results of examining the recontamination prevention rate of a composition consisting of LAS, Na salt, and softanol EO adduct with an average of 50 moles. These results in Table 4 demonstrate that the composition according to the present invention has a remarkable ability to prevent redeposition. In addition, the recontamination prevention ability was measured using Terg-O-
The degree of recontamination (SE%) was measured by reflectance using a tometer under the following conditions. Measurement method Surfactant concentration 0.03% by weight Water used Tap water 1 White cloth T/C broad 10cm x 10cm 1 piece Recontamination conditions 25℃, 100rpm for 5 minutes Dirt carbon black 0.01% by weight Oil content 0.05 〃 Oil content (triolein, squalene) , liquid paraffin, and oleic acid in equal parts by weight) SE% = 100 x (R _O − R _S )/R _O R _O : Reflectance of white cloth R _S : Reflectance of recontaminated white cloth

【table】

Claims (1)

[Claims] 1 Average of 10 to 20 secondary alcohols with 8 to 20 carbon atoms
The weight ratio of 130 moles of ethylene oxide adduct to long-chain alkylbenzene sulfonate is 1:3 to 1:3.
A surfactant composition with good calcium solubility characterized by containing calcium in a ratio of 3:1.