JPH06501507A - Stabilized surfactant paste - Google Patents

Abstract

Aqueous surfactant pastes, in particular those containing non-ionic surfactants of the alkylglycoside type, are given excellent storage stability against microbial attack when, following an oxidative bleaching procedure to remove alkali-sensitive pigments, the pH is adjusted to a value of at least 11 by the addition of alkaline substances.

Description

[Detailed description of the invention] The present invention provides a surfactant consisting essentially of nonionic surfactants, especially of the alkyl glycoside class. A surfactant, an aqueous surfactant paste stabilized against microbial contamination. related. The present invention also relates to a method for producing the surfactant paste.

Surfactants present in modern detergents and cosmetic cleansing formulations are biodegradable. Strict sexual requirements must be met. Such surfactants are often However, despite the high surfactant concentration, it is preferable to use a pump and the pouring rate is low. It is commercially available in aqueous formulations. These aqueous mixtures are Because of its nature, it is easily contaminated by microorganisms such as bacteria and fungi, and surfactant products are The quality and especially the storage stability may be impaired. Prevents microbial contamination and provides sufficient storage stability There are many useful antimicrobial agents that can be used as warranties, such as geltaraldehyde and benzoic acid. The use of such preservatives is associated with technical problems. i.e. the presence of such preservatives There is a risk of causing discoloration of the surfactant paste during storage. On the other hand, The presence of surfactant pastes is then accepted by all users of surfactant pastes. It's not like that.

But finally, surfactant aqueous pastes protected from microbial contamination can be Even if there are no contaminants, measures have been taken to ensure that certain contaminants are not present during manufacturing. It has been discovered that it can have excellent storage stability as long as it is stored.

These requirements are important for surfactants that are stable in alkaline environments, especially alkyl glycosides. Contains 30 to 70% by weight of nonionic surfactants of the same type, and prevents discoloration in an alkaline environment. Virtually removes the causative bleachable coloring substances and their precursors from teeth and during storage By-products and residues that lower the pH value due to the loss of alkali are virtually non-toxic. , the pH value of which is increased by addition of alkaline substances to at least 11, preferably 11 ~12.5, more preferably at least 11.5. Filled with sex agent aqueous paste.

Surprisingly, the product of the present invention retains its color even after several months of storage at 40-50°C. are stable and free from microbial contamination and therefore require additional chemical stabilization. I discovered that it does not.

Surfactants that are stable in alkaline environments include compounds with closed terminal groups. Surfactants such as alkoxylated long-chain alcohols, especially fatty alcohol ethoxylates, chemical compounds, alkyl ether carboxylic acids, fatty alcohol sulfates and - Tersulfate surfactants, alkanesulfonates and especially hydrophilic moieties are understood to be surfactants derived from hydrocarbon compounds. Alkilguli Particularly preferred are surfactants of the Conodo class. This type of surfactant is composed of sugar and alkaline Alkyl monoglycones and alkyl polyglycones obtained in acid-catalyzed reactions with It is understood that it is a mixture with glyconodes.

Particularly preferred alkyl glycondes are, for example, U.S. Pat. No. 3,547,828 and No. 3,839,318. Especially the light color A method for producing stable alkyl glyconodes is described in European Patent Publication No. 0301298- Al, 0362671-Al and 0357969-. It is listed in A1 Ru. The alkyl moiety of the alkyl glycoside generally has 8 to 24 carbon atoms, especially 8 to 18 carbon atoms. Consists of aliphatic residues with elementary atoms. Fat Al from Fat as a Renewable Raw Material Particular preference is given to the corresponding fatty alkyl residues obtained via calls. synthetic primary alkaline Alkyl groups derived from alcohols, especially so-called oxoalcohols, are also in principle is suitable, but not very preferred in the present invention. Saccharogenesis of alkyl glyconodes Minutes include typical aldoses or ketoses, such as glucose, fructose, Mannose, galactose, glucose, glucose, allose, aldrose, i Can be derived from doses, arabinose, quinolose, lyxose and lipose.

Raw materials such as glucose or starch or starch decomposition products are available in large quantities. In this case, glucose is a particularly preferred sugar component. The amines present in the paste of the present invention The average degree of polymerization of lukyl glyconodes can be arbitrarily assumed from the viewpoint of paste stability. However, the typical range is 12-30. This average degree of polymerization is Alkyl monoglycondo and alkyl oligoglycondo surfactants in the product Based on the amount of. However, the degree of polymerization is clearly less than 15, especially in the range of 13 to 14. Preference is given to using alkyl glycosides, the fatty alkyl groups involved being essentially CI2 It is. Depending on the width of the fraction, different amounts of 08-1° and Cl4-16 are present. may be present. These alkyl glycondes are characterized by particularly good surface activity shall be. These, along with water and alkaline substances, are particularly preferred embodiments of the invention. Another preferred embodiment is C8/. and centered on CI 4/l 5 It concerns the fractionation of carbon chains. The former has very good solubility, while the latter They are suitable as wetting agents and emulsifying agents.

The viscosity of the paste referred to by “surfactant paste” ranges from fluid to strong. Even viscous ones. Corresponding viscosity [HQppler viscometer] Measurements were made at 40°C using Brookfield Helibus. Measured at 40°C and 4 rpm using a Helipath viscometer: It ranges from about 1,000 to 100,000.

Surfactants The surfactants present in the aqueous paste, especially alkyl glycodoes, When the surfactant is subjected to a bleaching process after production, coloring substances, precursors of coloring substances, color Virtually free of quality-impairing by-products and residues. The bleaching process is an oxidative bleaching process. It is particularly preferable to use hydrogen peroxide as the oxidizing agent. these The bleaching step is preferably carried out in the presence of magnesium cations; The magnesium cation is in the form of alkaline magnesium compounds, such as oxides and hydroxides. product, carbonate or alcoholade, in the case of alkyl glycolides. An acid catalyst may be introduced into the system at the end of the production process to neutralize it. However, surfactants At the end of the manufacturing process, typical alkalis, especially alkaline sodium compounds, Neutralization is sufficient, followed by water-soluble or insoluble magnesium compounds. , for example, in the above case, the next bleaching step is 100 to 11,000 pp of magnesium. It is added in such an amount that it will proceed in the presence of the solvent. At least 9, preferably in the bleaching process If measures are taken such that a high pH of 10 is maintained, bleaching By heat treating the paste at 80-150℃ as the final step of the process. The peroxide residue can be reduced to a value of at most 50 to 1100 pp H2O2.

Oxidatively bleached products may be post-treated with reducing agents; The value must not drop below 8.5 drops. p of the surfactant treated in this way The H value measures the loss of alkali seen during bleaching, including sodium hydroxide and potassium hydroxide. compensation by the addition of sodium or potassium carbonate to achieve the desired p. By adjusting the H value, a high value according to the present invention is obtained.

Therefore, the present invention provides a method for making alkali-stable surfactants using typical manufacturing methods. storage stability of the kind obtained after additional bleaching with aqueous H,02 It is also concerned with the production method of surfactant aqueous pastes, especially alkyl glyconde pastes. The bleaching process uses H2O2 as oxidative bleaching and Conducted in an alkaline environment with a pH of 9 or higher, preferably a pH of 10 or higher in the presence of a compound. However, in this manufacturing method, the residual amount of peroxide is reduced to a value of at most 50 to 100 pp■H20□. without interfering with subsequent use of alkalis, especially surfactant pastes. or alkaline compounds whose presence is desirable, especially sodium hydroxide and potassium hydroxide. The pH can be lowered by adding sodium carbonate or potassium carbonate. a value of at least 11, preferably between 11 and 12.5, more preferably at least 11.5 The water content of the paste is adjusted to a value in the range of 30 to 70%. Ru.

The surfactant aqueous paste of the present invention produced in this way is in a particularly preferred state. If an alkyl glycoside paste is present in the Particularly suitable for further processing when mixed with defined additional surfactants or This results in good viscosity and fluidity of the paste during storage. A mixed surfactant mixture can be obtained.

To produce a stabilized paste according to the invention, peroxide bleaching, peracid bleaching, The process steps of chemical decomposition, optionally reductive work-up and pH adjustment can be carried out continuously or can be performed discontinuously. The bleaching process and peroxide decomposition are continuous, especially with stirring. Preferably carried out in a tank cascade with suitable temperature and duration parameters. Delicious. For example, a peroxide bleaching process uses H2O2 at 110°C. The average duration was 2 hours, and the peroxide residue was approximately 300 to 600 pp. It becomes mH2O2. In the subsequent peroxide decomposition step, the mixture was heated to 120°C. Hold for an average of 3 hours, resulting in a peroxide residue of 30-70 pp-.

A product that is stable to microorganisms and alkaline is combined with dodecanol and glucose. It was prepared from 100 kg of a reaction mixture prepared by reaction in a molar ratio of 5:1. child The mixture contains about 27.5% alkyl glycoside and catalyst (p-toluene sulfonate). It contained 0.2% of phosphoric acid). The treatment was performed as follows: The catalyst was neutralized by adding 100 g of 0% sodium hydroxide.

- 15 g of finely ground magnesium oxide were then mixed in.

- The mixture is heated in a thin layer evaporator at a heat carrier temperature of 200 °C and 1 mbar. It was distilled until the fatty alcohol residue was 1%. Approximately 28 kg of distillation residue was obtained. Ta.

- Fully deionized water was added to the residue to give about 56 kg of aqueous paste.

300 g of HxOt (10100 O in 30% solution and 420 g of NaOH (50 % solution) was added and bleached for 1 hour at 110° C. in a pressure reactor.

After degassing under reduced pressure, a pale yellow product was obtained with peroxide residue at 350 ppH. .

- The product was thermally worked up for a further 3 hours at 120°C. peroxide residue decreased to less than 50 ppm and no significant change in product color was observed.

The pH value of the paste obtained was 11.5 and remained stable even after storage at 60°C for 4 months. Met. In a microbial contamination test using 10'/g of bacteria and 10'/g of fungi, During the entire storage period, the kill time was at most 3 days for bacteria and 14 days for fungi. Ta.

(Bacterial mixture: Staphylococcus aureus, Enterococcus faesi) um, Escherichia nierei, Enterobacter aerogenes, Pseudomo Solanum aeruginosa. Fungal mixture - Candida albicans, Aspergius - Niger, Penicillium rubrum, Trichoderma viride. ) Paste viscosity is 1800 mPa5 at 40°C, measured according to DIN 53015. Met.

Example 2 Molar ratio of glucose to 01□714 fatty alcohol (75/25%) 1:4. The reaction mixture obtained by the reaction in step 5, containing 29% alkyl glyconde. 100 kg was treated as follows.

- 110g of 50% sodium hydroxide It was neutralized.

- 1g020g finely ground was mixed.

- Distillation was carried out in the same manner as in Example 1 to obtain about 30 kg of APG residue.

- After preparing 50% aqueous paste, 400 g of H2O2 (1330 g with 30% solution) ) and 8300 g of NaO (600 g of 50% solution) were added and heated at 105°C for 2 hours. Bleached for an hour.

Thermal post-treatment was carried out at -1058C for 6 hours, and the peroxide residue was less than 50 ppm. completely decreased.

- The product was degassed under reduced pressure. Furthermore, 300 g of NaOH (600 g as a 50% solution) ) to pH 1! [adjusted to 118.

After storage for 4 months, the color of the product is stable, the pH value is constant at 118, and the microorganisms are The stability against was equivalent to that of Example 1. Paste viscosity 2000mPa5 ( Measured in the same manner as in Example 1).

international search report Continuation of front page (72) Inventor Niskuchen, Reiner Federal Republic of Germany Dee 4000 Düsseldorf, Benrater Schlossersee - 36 (72) Inventor Vuyten, Manfred Federal Republic of Germany Dee 5650 Solingen 11, Hermann-Rensveeg 102

Claims (6)

[Claims] 1. Surfactants that are stable in alkaline environments, especially nonionic alkyl glycosides. Contains 30-70% by weight of surfactant and is free from bleaching that causes discoloration in alkaline environments. Virtually free of whiteable coloring substances and their precursors and free of alkaline quenching during storage. It is virtually free of by-products and residues that lower the pH value by loss. of at least 11, preferably 11 to 12.5, by the addition of alkaline substances. range, more preferably at least 11.5. sex paste. 2. The paste is subjected to oxidative bleaching and optionally post-treatment with a reducing agent. 2. The product of claim 1, wherein the product comprises: 3. The paste contains 100 to 1000 ppm of the surfactant as the active substance. Contains gnesium, and the peroxide residue is at most 50-100 ppm H2O2. Product according to claim 1 or 2, characterized in that: 4. The surfactant paste essentially contains especially C8-18 fatty alkyl groups. Non-alkyl glycosides having a degree of polymerization of 1.2 to 3, preferably 1.3 to 1.4. Claim 1 comprising an ionic surfactant, water and an alkaline substance. The product according to any one of ~3. 5. In addition to alkyl glycosides, use only a small amount of other surfactants that are stable at pH 11 or higher. Any one of claims 1 to 4, characterized in that it contains one of both in a mixed state. Products listed in. 6. After reducing the peroxide residue to a value of at most 50-100 ppm H2O2 , alkalis, especially surfactants, do not interfere with the subsequent use of the paste or their presence The pH is adjusted to at least 11, preferably 1, by the addition of the desired alkaline compounds. The water content of the paste is adjusted to a value of 1 to 12.5, more preferably 11.5, and the moisture content of the paste is 30 to 12.5. The surfactant according to claim 1, wherein the surfactant is adjusted to a value in the range of 70%. Method for producing aqueous paste.