JPH02289697A - Composition for cleaning rigid surface - Google Patents

Abstract

PURPOSE: To provide the title composition that is highly alkaline, prevents metals from being corroded, and gives an optimum cleaning effect by incorporating specified metasilicate, alkanolamine, organic surfactant, and water-soluble organic solvent, and water in a specified ratio.

CONSTITUTION: The intended composition is a liquid having a pH of about 10.5 to 12.5 and comprising (A) about 0.1 to 0.5% (by weight) alkali metal metasilicate, (B) about 1 to 10% (by weight) mono-, di and/or tri-ethanolamine, (C) about 1 to 5% organic anionic surfactant comprising an (about 9-15C) alkylbenzene (or toluene) sulfonic acid and/or an alkyl ether sulfonate of the formula wherein R represents an about 10-20C alkyl or alkenyl, n is 1 to 30, and M represents a water-soluble cation, (D) about 1 to 10% water-soluble organic solvent comprising a 1-4C monovalent aliphatic alcohol and/or a mono(1-4C)alkyl ether of a mono-, di-, or tri-(2-3C)alkylene glycol, and (E) the balance of water.

COPYRIGHT: (C)1990,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to highly alkaline, aqueous, hard surface cleaning compositions for cleaning industrial and kitchen surfaces contaminated with baked-on oil and other organic soils. More particularly, the present invention relates to compositions that have significantly reduced corrosive effects on metals such as aluminum and stainless steel that are normally experienced during cleaning with highly alkaline cleaning compositions. The use of highly alkaline cleaning agents to remove baked-on oil and other organic stains from cooking appliances and utensils is well known. This type of cleaning agent is used to convert baked-on oil and other organic stains into substances that can be easily emulsified and removed with cleaning agent ingredients, such as surfactants and water, by saponifying the fats that constitute them. High alkalinity is required. However, while they are effective at removing oil and other organic stains, these types of cleaners tend to be corrosive to certain metals used in cookware and appliances, such as aluminum and stainless steel. ．． Therefore, there is a need for a highly alkaline cleaning agent that is not only effective in removing baked-on oil and other organic stains, but also has minimal corrosivity to aluminum and stainless steel. U.S. Pat. No. 3,935,129 describes five basic components: monourea, glycerin, triethanolamine, organic anionic detergents and organic nonionic detergents, and one component which may or may not be present: monosilicic acid. A "system" of aqueous, liquid cleaning compositions containing alkali metal salts is presented, where the concentration of each of the five basic components is determined by the concentration of the silicate. Compositions for various cleaning applications are shown, including a hard surface cleaner having a pH of 12 and consisting of sodium silicate, five basic ingredients, and water.
Example 2) of the same specification, in which one of the two anionic detergents used is dodecylbenzene sulfonate, and the amount of silicate substantially exceeds the amount of triethanolamine. ．． U.S. Pat. No. 4,540,505 describes a quaternary ammonium compound, a nonionic surfactant, d-limonene, an alkaline bilgu (which may be sodium metasilicate), a monoether of an aliphatic glycol, and water. , and optionally a lower aliphatic alcohol, a pump spray aqueous cleaning composition with a bactericidal effect is described, in which a glycol monoether has no effect on the destabilizing effect of d-limonene without its addition. The composition functions to stabilize the composition and enhance the removal of stains and smudges from hard surfaces. U.S. Pat. No. 4,202,800 contains one or more alkanolamines, sodium carboxymethylcellulose, nonionic surfactants, water, and optionally brighteners, fragrances, pigments, and/or compositions. A liquid laundry detergent composition comprising a stabilizing solvent (which may be a specific glycol ether) is shown. U.S. Pat. No. 4,539,133 describes the widespread use of alkali metal silicates in the detergent manufacturing industry to achieve corrosion protection, *W properties, and bilge properties; Neutral or low alkalinity aqueous liquid detergent compositions are described which consist of 1 to 10% by weight of an alkali metal silicate salt, such as a di- or tri-silicate. U.S. Pat. No. 3,825,854 discloses that strong caustic alkalis are effective as oven cleaning compositions because they saponify fats in oven deposits to produce materials that can be removed from the oven; Similar effects have been shown to be observed for silicates, ammonia, and amines. Does not irritate the skin
Prepared as a paste or aerosol consisting essentially of a copolymer of styrene and maleic anhydride (reacted with a caustic substance, e.g. an alkali metal oxide or hydroxide), an alkali metal silicate, or an alkanolamine, and water. A moisturizing oven cleaning composition is described. Ingredients used in the invention 1 described in more detail below
Patent specification of interest in that it indicates a liquid detergent containing one or more species and that it indicates the state of the art relating to liquid detergents for cleaning hard-to-remove baked-on stains from household products is as follows. U.S. Patent No. 2,836,56e; 3,272,753. 3
, 328, 309. 3,579,455. 4,07
0,309. 4,421,680. 4,4,501
, 681. 4,581,181 and 4,725,3
No. 19 specifications. As mentioned above, highly alkaline cleaners used on hard cookware surfaces are very effective at removing baked-on oils, but the drawback is that they can be corrosive to metal surfaces, such as aluminum and stainless steel. Has. For highly alkaline hard surfaces, when a precise ratio of alkanolamine to metasilicate combination is formulated with certain other essential ingredients, it provides optimal cleaning efficiency without the corrosive effects that high alkalinity normally has on metal surfaces. It has been found that a cleaning agent can be obtained.

Therefore, the present invention provides (a) an alkali metal metasilicate salt of about 0.1 to about 0.5 weight! (b) about 1 to about 10% by weight of an alkanolamine selected from the group consisting of monoethanolamine, diethanolamine and triethanolamine; (c) alkali metal salts of alkylbenzenesulfonic acids and alkyltoluenesulfonic acids (in which alkyl is Approximately 9 to 15
carbon atoms), as well as the formula RO (CH2CH2
0). an alkyl ether sulfate of S03M, where R is an alkyl or alkenyl containing from about 10 to about 20 carbon atoms, n is from 1 to 30, and M is a water-soluble cation. (d) monoalkyl ethers of alkylene, dialkylene or trialkylene glycols, including monohydric aliphatic alcohols (containing 1 to 4 carbon atoms); from about 1 to about 10% by weight of a water-soluble organic solvent selected from the group consisting of: alkyl contains 1 to 4 carbon atoms; alkylene contains 2 to 3 carbon atoms; and (e) 100% by weight. the balance water, the weight ratio of component (b):component (a) being about 5.5:1 to 28:1; and the pH of the composition being about 10.
5 to about 12.5. The composition of the present invention is utilized as a hard surface cleaner in industrial, restaurant, and home kitchen environments. They are very effective in removing baked-on oil and other organic soils and exhibit little or no corrosive effect on aluminum and stainless steel surfaces.

The composition of the present invention consists of five essential ingredients: metasilicate, alkanolamine, organic anionic surfactant, water-soluble organic solvent, and water; it may also contain certain other ingredients as detailed below. ．． The metasilicates used are alkali metal silicates, such as sodium and potassium metasilicates, which may be in either anhydrous or hydrated form. Mixtures of metasilicates can also be used. The metasilicate functions as a detergent and as a buffer that maintains a high pH, thereby facilitating its function as a detergent. Based on the anhydrous metasilicate, the concentration of alkali metal metasilicate in the composition is about 0.1-0.5% by weight
It should be. Alkanolamines Alkanolamines also function as detergents, and their combination with metasilicates is the basic alkalizing agent in the composition. It is selected from monoethanolamine, diethanolamine, triethanolamine and mixtures thereof, with monoethanolamine being preferred. The concentration used should be about 1-10% by weight of the composition. Organic anionic surfactants provide cleaning power and act as emulsifiers against food stains. It must have good foaming properties and be stable at the high pH of the composition. Suitable anionic surfactants are selected from the following types of commercial products:

(a) Alkali metal salts of alkylbenzenesulfonic acids and alkyltoluenesulfonic acids, such as sodium and potassium salts, in which the alkyl is about 9 to
and (b) a set of alkyl ether sulfates of the formula RO(CJ<0)n-SOJ, in which R is alkyl or alkenyl containing about 10 to about 20 carbon atoms; n is 1-30 and M is a water-soluble cation such as ammonium or an alkali metal such as sodium and potassium. Preferred are washed alkylbenzene sulfonates, with dodecylbenzene sulfonate being particularly preferred. The concentration of organic anionic surfactant in the composition is about 1-5
It should be expressed as % by weight. Kumiichi 1 The solvent dissolves or assists in the dissolution of cooking oil stains and organic substances resulting from saponification of the oil by the composition. Suitable solvents are water-soluble organic solvents selected from the following. i.e. monohydric aliphatic alcohols (containing 2 to 4 carbon atoms) such as methyl alcohol, ethyl alcohol and inglobil alcohol; or monoalkyl ethers of alkylene, dialkylene or trialkylene glycols (in which alkyl is ~
4 carbon atoms and alkylene contains 2 to 3 carbon atoms'', such as ethylene glycol butyl ether, propylene glycol methyl ether, diethylene glycol butyl ether, dipropylene glycol methyl ether, and tripropylene glycol methyl ether. The concentration of solvent in the composition is determined by several factors, such as the desired potency and properties obvious to those skilled in the art, such as toxicity and viscosity.

Generally, the concentration of solvent in the composition will be about 1-10% by weight. In order to eliminate or minimize the corrosive effects on metals normally associated with the use of highly alkaline cleaning agents, such as aluminum and stainless steel, alkanolamines:
It is important to control the metasilicate proportion within certain specified limits. The ratio of alkanolamine: metasilicate (based on anhydrous metasilicate) is therefore approximately 5.5:
1 to about 28:1, and about 12:1 to about 13
=1 is preferable. In order to effectively remove baked-on oil and other organic soils from hard surfaces, the compositions of the present invention must be highly alkaline, i.e., about 10.5-12
．． Must have a pH of 5. As mentioned above, the combination of metasilicate and alkanolamine is the primary alkalizing agent in the compositions of the present invention, with appropriate amounts of metasilicate and alkanol within the above weight percent concentrations and weight ratios of each other. By using amines, approximately 1
A pH of 0.5 to 12.5 is obtained. The compositions of the present invention may contain certain optional ingredients to impart additional desirable properties and/or aesthetic appeals thereto. For example, for aesthetic purposes, optional ingredients such as dyes, fragrances, and opacifying agents may be included. The above composition has good physical stability at the temperatures at which it is stored on a home or store shelf, i.e., normal room temperature, but substantially below normal room temperature, such as encountered during warehouse storage. Physical stability may be an issue at temperatures that can cause Therefore, the present composition may optionally contain, and preferably contains, a small amount of a nonionic surfactant as a physical stabilizer. Nonionic surfactants also serve to solubilize fragrances optionally included in the composition.
The following nonionic surfactants are suitable for this purpose. (a) Alkyl and dialkylphenols (with straight or branched chain alkyls of about 8 to about 9 carbon atoms)
and ethylene oxide (the amount of ethylene oxide present is from about 9 to about 15 moles per mole of alkyl and dialkylphenols); and benzyl ethers of these alkylphenols; and (b) formula RO (CJ<0) n}l, a condensate of aliphatic alcohol and ethylene oxide (wherein R is about 12 to about 1
straight-chain and branched alkyl containing 5 carbon atoms, n being 3 to 15). The selected nonionic surfactant will generally be used in the composition at a concentration of about 0.1 to 1% by weight.

Thickeners can also be included in the composition, and are preferred. When cleaning baked-on oil from hard surfaces as described above, the composition should remain in contact with the oil for about 5 to 10 minutes after being applied to the surface. Therefore, the vertical plane,
For example, if oven walls need to be cleaned, it is advantageous to include a thickener in the composition to improve the adhesion of the composition to the surface. Thickeners must be stable and compatible with the various ingredients in the composition. A thickening agent that has been found to be particularly effective is an acrylate copolymer sold by Rohm and Haas Company under the tradename crysol ICS-1, for which C.I. T. F.
^． The approved name is Acrylates/Steareth-20 (
Steareth-20) is a methacrylate copolymer. The thickener is used in the composition at a concentration of about 1.5-2% by weight. The compositions of the present invention can be used undiluted to clean coin surfaces in industrial, home and restaurant kitchens, such as oven surfaces, range tops and heating elements, kettles and pans. They are extremely effective at removing baked-on oil and other organic stains and do not require scrubbing with harsh cleaning tools such as stainless steel or copper scrubbers. In use, apply an effective amount of the composition to the surface to be cleaned, and if desired to remove baked-on oil or other organic stains, apply approximately 5 to 10 ml of the composition, depending on the degree and severity of the stain.
Maintain contact with oil or other organic dirt for a period of time. The surface is then scrubbed with a sponge, cloth, soft scrubber, etc. to remove dirt, rinsed, and wiped off with, for example, a paper towel. If the contaminated surface to be cleaned does not contain baked-on oil, immediately after applying the composition, wipe the surface with a sponge.
It can be rubbed with a cloth or soft scrubber, rinsed, and dried. The above composition may be used in any known liquid dispenser,
For example, a squeeze bottle with a suitable dispensing top;
It can also be filled into a container equipped with a trigger bomb type spray device, and the latter is preferred because of the wider angle of use afforded by this device. The compositions can also be formulated as an aerosol by standard, well-known methods. The composition of the invention is conveniently prepared by mixing the ingredients at room temperature as described below. 1. A mixing tank equipped with a variable speed stirrer is charged with the prescribed amount of water, and stirring is started while avoiding excessive aeration.

2. Add the solvent, anionic detergent and any nonionic surfactant to the water and dissolve completely. 3. Then add any flavoring and/or thickening agent. Addition of a thickener will result in an emulsion.

4. The silicate and alkanolamine are then slowly added, causing the solution to clear and thicken. 5. Finally, add any dye and/or opacifier to complete the formulation. The composition of the present invention will be explained by the following detailed formulation examples, but the present invention is not limited thereto. All formulations below were prepared by the general method described above. Weight percentages of ingredients indicated are based on 100% active substance. Weight % Sodium monoethanolamine dodecylbenzenesulfonate tripropylene glycol methyl ether 2.7 2,10 2.90 2.7 2.10 2.90 2.48 2.10 2.90 Thickener (b) Opacifying Agent (c) Lemon fragrance 1.90 0.05 0.2 1.90 1.90 (a) Igepal Co-7
30. Obtained from GAF Corporation - Average 1
A surfactant of the following formula containing 5 ethylene oxide units, where R is nonyl and n is 15 (C.T.F.
A. Approved name: Nonoxynol-15). (b) Acrysol ICS-1, obtained from Rohm and Haas Company; Acrylates/Stainless Steel-20 Methacrylate Cobolimer; Steareth-20
is the general formula CI{3(CH2+aC)l2(QC}Ia
CH2)n-ON, where n has an average value of 20. (c) Witcopaque 2
5 (Latex), obtained from Witco Chemical Corporation - Styrene/Acrylate Copolymer Two cleaning compositions were prepared for comparison with the compositions of the present invention in cleaning and corrosion tests. One comparative composition (e.g. A) was similar to the composition of Example 2 except that the monoethanolamine:metasilicic acid ratio was adjusted to 1:1, and the total weight of these components was the same as in Example 2. The other comparative composition (Example B) differs from Example 2 in that it does not contain monoethanolamine and has increased metasilicate to an amount equal to the combined weight of monoethanolamine and metasilicate of Example 2. The details of the comparative composition are as follows: Weight% Monoethanolamine Sodium dodecylbenzenesulfonate Tribrobylene glycol Methyl ether Nonylphenoxybori(ethyl) 1.46 2.10 2.10 2 .90 2.90 pH 13.5
14.07 of May
1=1 (a) Igepal Co-730 (b) Acrysol ICS-1 Compatibility of the compositions of Examples 2 and 3 and Examples A and B with aluminum and stainless steel substrates was determined, and baked oil droplets were determined. Corrosion resistance tests and cleaning tests were conducted on each of these compositions in accordance with the following to evaluate their cleaning efficacy against soiling. 1 Ko R1 (1) ttfi Aluminum pot (Miro) or equivalent aluminum-based stainless steel pot (Revere Ware) or equivalent stainless steel-based isobrobyl alcohol (2) Mansai test The oil film was removed from the new pan by cleaning the surface with isopropyl alcohol. Two drops (approximately Ig) of the test composition were then applied to the vertical side of the pan at room temperature and left in contact with this exposed surface for 24 hours at room temperature. The treated surfaces were then rinsed with tap water, wiped dry and the contact areas were evaluated for corrosion according to the following scale. None No change Low = Outline or ring resembling water spots Moderate Dull spots on the surface Extreme = Dull white powder or anti-corrosive indigo phoenix (1) L! 1 Lean ground beef 90g Flour 15g Tomato sauce 57g Egg
1 (whole egg) water
200g aluminum pot (Miro) (2) Method Prepare the stain by blending the above ingredients in the indicated amounts for about 5 minutes, then add 2g each to a pot with a diameter of about 12
．． It was applied in the form of a 7 mm (1/2 inch) round spot. The dirty pan was then placed in an oven at 105°C for 2 hours. The pan was allowed to cool to room temperature and the test composition was applied in a film over these baked-in soil spots. After a contact time of 10 minutes, the treated area was rubbed five times with a damp sponge, blotted dry with a barber towel, and visually evaluated according to the scale described below. Excellent = Dirt was completely removed. Good = A few spots of dirt remained.

Fair = Approximately 50% of dirt was removed. Unsatisfactory = Removal of dirt was less than 50%. It is recognized that there is no low degree, no moderate degree, moderate degree, and moderate degree. On the other hand, the comparative compositions of Examples A and B exhibited a moderate corrosive effect in both cases. (Other 4 people) 2 Good 3 Good A Good B Good

Claims (1)

[Claims] 1. (a) an alkali metal metasilicate salt of about 0.1 to about 0.
(b) from about 1 to about 10% by weight of an alkanolamine that is monoethanolamine, diethanolamine and/or triethanolamine; (c) an alkali metal salt of an alkylbenzenesulfonic acid or an alkyltoluenesulfonic acid, in which the alkyl from about 9 to about 15 carbon atoms) and/or an alkyl ether sulfate of the formula RO(CH_2CH_2O)_nSO_3M, where R is alkyl or alkenyl containing from about 10 to about 20 carbon atoms, and n from 1 to 30 and M is a water-soluble cation); (d) a monohydric aliphatic alcohol (containing 1 to 4 carbon atoms); and and/or monoalkyl ethers of alkylene, dialkylene or trialkylene glycols, in which alkyl contains 1 to 4 carbon atoms and alkylene contains 2 to 3 carbon atoms. about 10% by weight; and (e) the balance being 100% by weight water, wherein the weight ratio of component (b):component (a) is from about 5.5:1 to about 28:1; The pH of something is about 10
．． 5 to about 12.5. 2. The composition according to claim 1, wherein the alkanolamine is monoethanolamine. 3. The composition of claim 1 or 2, wherein the ratio of component (b) to component (a) is from about 5.5:1 to about 13:1. 4. The composition of any of claims 1 to 3, comprising from about 1.5 to about 2% by weight of a thickening agent that is an Acrylates/Steareth-20 methacrylate copolymer. 5. Additionally, from about 0.1 to about 1% by weight of a nonionic surfactant, i.e., an alkyl or dialkyl phenol (
a polyethylene oxide condensation of ethylene oxide (wherein the alkyl contains about 8 to about 9 carbon atoms) and ethylene oxide (the amount of ethylene oxide present is about 9 to about 15 moles per mole of alkyl or dialkylphenol);
benzyl ether of the above alkyl or dialkylphenol; and/or of the formula RO(C_2H_4O)_
nH, a condensate of an aliphatic alcohol and ethylene oxide, where R is alkyl containing about 12 to about 15 carbon atoms, and n is 3 to 15. The composition according to crab. 6. The composition according to claim 5, wherein the nonionic surfactant is a polyethylene oxide condensate of alkylphenol. 7. The composition according to any one of claims 1 to 6, wherein the anionic surfactant is an alkali metal salt of an alkylbenzenesulfonic acid or an alkyltoluenesulfonic acid. 8. The alkanolamine is monoethanolamine, and the ratio of monoethanolamine:metasilicate is about 5.
8. The composition of claim 7, wherein the ratio is from 5:1 to about 13:1. 9. about 0.22% sodium metasilicate by weight of the composition; about 2.70% monoethanolamine; about 2.
10% sodium dodecylbenzenesulfonate; approx.
．． 90% tripropylene glycol methyl ether;
Approximately 1.90% Acrylates/Steareth-20 methacrylate copolymer; approximately 0.7% Nonoxynol-1
5; and the remainder being 100% water.
The composition described in .