KR20010017103A - A process for cleaning textile - Google Patents

Abstract

PURPOSE: A method for laundering fabric is provided to be capable of removing any oil trace and/or oily spots as well as removing any silicon contained in the fabric. CONSTITUTION: First, composition consisting of linear siloxanes of low molecular weight represented as a chemical formula of CH3£(CH3)2SiO|nSi(CH3)2CH3, and (+) ion surface active agent is applied to contaminated fabric, and the contaminated fabric is heated at a temperature lower than the temperature degrading the fabric under the conditions that inorganic basic compound is provided. Here, n in the above chemical formula is integer of 1 to 7. It is preferable that the (+) ion surface active agent is quadratic ammonium salt such as trialkylmethyl ammonium salt, dialkylmethyl ammonium salt, and blend thereof.

Description

Fabric washing method {A PROCESS FOR CLEANING TEXTILE}

The present invention relates to a method for washing a fabric, in particular for the removal of any greasy and / or oil stains from the fabric and for the removal of silicone retained in the fabric.

Some greasy and / or oil stains have been removed from the fabric by various methods for laundry purposes. On the other hand, silicone liquid has been used as a fabric treatment agent to impart flatness, flexibility and the like. However, the presence of these silicone treating agents in the fabric adversely affects the recoloring of the fabric and therefore they must be removed before dyeing. Therefore, a product called "stripping agent" made by a combination of surfactants is commercially available, but not completely satisfactory, especially for aminosilicone textile processing agents.

Low molecular weight siloxanes called "volatile siloxanes" have been used to wash substrates, including fabrics. It is often used in combination with a surfactant. These are disclosed in the following patents, which are incorporated herein by reference. The cyclic siloxanes used in these prior art patents are not effective in the present invention.

US 4,654,041 discloses a process for removing silicone from fibers, yarns or two-dimensional textile materials by the action of an interfacial equilibration catalyst for organosiloxanes and an aqueous formulation which may optionally contain detergents, wetting agents and alkali carbonates.

US 4,685,930 applies liquid compositions consisting essentially of cyclic siloxanes and surfactants such as anionic, nonionic, zwitterionic or amphoteric surfactants to contaminated fabrics with oils, greases or sebum and from the fabrics cyclic siloxanes and oils, A method of washing a fabric comprising removing a combination of grease or sebum is disclosed.

DE 3739711 A1 discloses a detergent consisting of cyclosiloxanes used in fabric washing and anionic, cationic and or ionic surfactants.

Summary of the Invention

The present invention is represented by the following formula 1

(Formula 1)

CH ₃ [(CH ₃ ) ₂ SiO] _n Si (CH ₃ ) ₂ CH ₃

(Where n is an integer of 1 to 7)

The present invention relates to a method for washing a fabric comprising applying a composition consisting of a low molecular weight linear siloxane and a cationic surfactant represented by the present invention to a contaminated fabric in the presence of an inorganic base compound and heating it to a temperature lower than the temperature at which the fabric deteriorates.

The method of the present invention can remove any greasy and / or oil stains from the fabric and remove the silicone retained in the fabric.

Detailed description of the invention

The method of the present invention for washing fabrics is of the following formula 1

(Formula 1)

CH ₃ [(CH ₃ ) ₂ SiO] _n Si (CH ₃ ) ₂ CH ₃

(Where n is an integer of 1 to 7)

A method of washing a fabric comprising applying a composition comprising a low molecular weight linear siloxane and a cationic surfactant represented by to a contaminated fabric and heating it to a temperature lower than the temperature at which the fabric degrades in the presence of an inorganic base compound.

Formula 1

(Formula 1)

CH ₃ [(CH ₃ ) ₂ SiO] _n Si (CH ₃ ) ₂ CH ₃

(Where n is an integer of 1 to 7)

Low molecular weight linear siloxanes represented by are well known in the art. Suitable siloxanes for the present invention should have a viscosity of less than 5 cs. Siloxanes having a viscosity greater than 5 cs cannot be used in the present invention. Preferred siloxanes are dimers, trimers and tetramers. As shown in the comparative examples, cyclic siloxanes cannot be used in the present invention. Silicone contamination will be swollen after absorbing the siloxane of the present invention and will be easier to cut into small fragments by the strong base carried by the cationic surfactant and the fragments can be dissolved in the siloxane liquid. When applied with cationic surfactants and bases, low molecular weight siloxanes can act as solvents to swell polysiloxanes, thereby promoting "cutting" efficiency because hydroxy ions can more easily penetrate into oil spots. have.

The cationic surfactant used in the present invention may be a quaternary ammonium salt. Preferably it may be selected from the group consisting of trialkylmethylammonium salts, dialkyldimethylammonium salts and mixtures thereof. Quaternary ammonium salts, wherein the alkyl radical contains no more than 8 and no less than 16 carbon atoms and whose salts are chlorides or bromide, are commercially available. Most preferred are trilaurylmethylammonium chloride and didecyldimethylammonium chloride. These ammonium salts are used individually or in mixtures thereof or in combination with other ammonium salts such as alkylbenzyldimethylammonium salts. Cationic surfactants alone can neutralize the negative charges on the fabric surface and can remove them from the fabric surface by approaching and reacting strong bases with silicone oil spots (cutting the polysiloxane into small fragments). The base is a true silicone stripper and the cationic surfactant is an aid to help the base reach its destination.

Suitable base compounds for the present invention depend on the material of the fabric. Preferred inorganic base compounds of the present invention are NaOH, KOH, Na ₂ CO ₃ , NaHCO ₃ and the like. Depending on the material of the fabric, for example, NaOH is good for cotton but not for wool. Na ₂ CO ₃ or NaHCO ₃ is preferred for wool.

The composition of the present invention may further comprise other components. For example, a nonionic surfactant may be added to the composition, which is used to stabilize the composition of the present invention. The composition is generally used in the form of an emulsion since it is usually added to an aqueous system. Those skilled in the art know that any nonionic surfactant is useful to meet this requirement. In addition, biocides may be used as preservatives in emulsions.

The proportion of components in the composition of the invention is not critical. Generally, however, the ratio of low molecular weight linear siloxanes to cationic surfactants ranges from 1:25 to 25: 1. The ratio (based on active ingredient) of the low molecular weight linear siloxane to the base compound of the cationic surfactant is in the range of 16: 1 to 16:20.

The order of addition of the components is also not important. However, a laundry composition consisting of a low molecular weight linear siloxane and a cationic surfactant is prepared in advance in the form of an aqueous emulsion, and the laundry composition and inorganic base are added to a washing tank loaded with water and a contaminated fabric, and then the washing tank is heated to a temperature higher than room temperature. It is desirable to. The upper limit of the temperature is the temperature at which the fabric can be exposed without deterioration by heat. The temperature varies with the length of the heating time. For example, the temperature is preferably 80 to 100 ° C., and the time is preferably 30 minutes to 3 hours. Lower temperatures may also be used but require longer time. After washing, the fabric will be neutralized with a weak acid such as acetic acid.

The effect of the method of the invention is further illustrated by the following examples, which are provided for illustration and do not limit the scope of the invention.

Work example and comparative example

(A) The following examples demonstrate the removal of oil spots from the fabric by the method of the present invention.

Various laundry compositions were prepared by mixing cationic and nonionic surfactants with water and then adding low molecular weight siloxane to the composition under stirring. The amount of ingredients in grams is listed in Table 1a and Table 1aa.

ingredient Composition 1 Composition 2 Composition 3 Composition 4 Composition 5 Composition 6 Composition 7 Composition 8 Composition 9 Siloxane (1) - - - - - - - - - Siloxane (2) 0.66 0.66 0.66 0.66 0.86 0.26 0.63 0.66 0.63 Siloxane (3) - - - - - - - - - Cationic Surfactant (a) 0.19 - 0.095 0.06 0.03 0.12 0.06 0.06 0.16 Cationic surfactant (b) - 0.19 0.095 0.03 0.02 0.06 0.03 0.03 0.03 Cationic surfactant (c) - - - 0.1 0.05 0.2 0.1 0.1 Cationic surfactant (d) - - - - - - - - Nonionic Surfactant (1) 0.06 0.06 0.06 0.06 0.08 0.02 0.01 0.05 - Nonionic Surfactant (2) 0.31 0.31 0.31 0.31 0.15 0.62 0.31 - - Nonionic Surfactant (3) 0.103 0.103 0.103 0.103 0.15 0.006 0.003 0.1 - water 0.49 0.49 0.49 0.49 0.5 0.48 0.24 0.813 0.563 Organic solvent 0.187 0.187 0.187 0.187 0.16 0.234 0.117 0.187 0.117 Sum 2 2 2 2 2 2 1.5 2 1.5

ingredient Composition 10 Composition11 Composition12 Composition 13 Composition14 Composition15 Composition16 Composition17 Siloxane (1) 0.62 - - - - - - - Siloxane (2) - 0.63 0.66 0.66 0.66 1.06 - - Siloxane (3) - - - - - - - 0.62 Cationic Surfactant (a) 0.06 0.06 - - - - 0.12 0.06 Cationic surfactant (b) 0.03 0.03 - - 0.095 - 0.06 0.03 Cationic surfactant (c) 0.1 0.1 0.19 - 0.095 - 0.2 0.1 Cationic surfactant (d) - - 0.19 - - - - Nonionic Surfactant (1) 0.01 - 0.06 0.06 0.06 0.1 0.02 0.01 Nonionic Surfactant (2) 0.31 - 0.31 0.31 0.31 - 0.62 0.31 Nonionic Surfactant (3) 0.003 - 0.103 0.103 0.103 0.2 0.006 0.003 water 0.37 0.563 0.49 0.49 0.49 0.5 0.74 0.37 Organic solvent 0.117 0.117 0.187 0.187 0.187 0.14 0.234 0.117 Sum 1.62 1.5 2 2 2 2 2 1.62 Siloxane (1): hexamethyldisiloxane (0.65 cs) siloxane (2): decamethyltetrasiloxane (1.5 cs) siloxane (3): cyclic octamethyltetrasiloxane cationic surfactant (a): trilaurylmethylammonium chloride Cationic surfactant (b): didecyldimethylammonium chloride cation surfactant (c): alkylbenzyldimethylammonium chloride cation surfactant (d): cetyltrimethylammonium chloride nonionic surfactant (1): 2,6, 8-trimethyl-4-onyloxypolyethyleneoxyethanol nonionic surfactant (2): alpha (C ₁₂ -C ₁₅ sec-alkyl) omega-hydroxy poly (oxyethylene) nonionic surfactant (3): alpha (C _12- C ₁₄ sec-alkyl) omega-hydroxy poly (oxyethylene) organic solvent: isopropanol or unknown solvent residue of ethylene glycol and surfactant

0.1 grams of the same silicone softener was added to a piece of cotton fabric to be tested (6 grams) containing 0.2% by weight of fabric softener (polydimethylmethyl (aminoethylamino-isobutyl) siloxane having a viscosity of 1500 cs.) It was applied to form an oil circle.

80 grams of water was added to the laundry container first. Then contaminated fabric, laundry composition and 0.2 grams of 50% NaOH were added and stirred at a temperature of 90 ° C. for 60 minutes. The wash solution was drained and the fabric was rinsed with water and neutralized by adding 0.093 grams of 60% acetic acid. The fabric was rinsed again with water and dried at 180 ° C. for 2 minutes.

After drying, the washed fabric was observed by dropping water. Grade 5 when oil spots were completely removed and grade 0 when oil spots were not removed. The results are shown in Table 2.

Work example Laundry composition Washing grade Work example 1 Composition 1 5 Work example 2 Composition 2 3 Work example 3 Composition 3 5 Work example 4 Composition 4 5 Work example 5 Composition 5 5 Work example 6 Composition 6 3 Work example 7 Composition 7 5 Work example 8 Composition 8 5 Work example 9 Composition 9 4 Work Example 10 Composition 10 5 Work Example 11 Composition 11 3 Comparative Example 1 Composition 12 One Comparative Example 2 Composition 13 One Comparative Example 3 Composition 14 2 Comparative Example 4 Composition 15 0-1 Comparative Example 5 Composition 16 One Comparative Example 6 Composition 17 0-1

It is apparent that the present method is more effective for removing oil spots from fabrics than known methods.

(B) The following examples demonstrate the removal of silicone retained on a fabric by the method of the present invention (for recoloring process).

A 0.3 gram emulsion-type laundry composition was prepared with cationic surfactant (0.018 grams of cationic surfactant (a); 0.009 grams of cationic surfactant (b); 0.030 grams of cationic surfactant (c)) and a nonionic surfactant ( 0.003 grams of nonionic surfactant (1); 0.093 grams of nonionic surfactant (2); 0.001 grams of nonionic surfactant (3) was mixed with 0.072 grams of water and 0.035 grams of miscellaneous organic solvent and then stirred into the composition under stirring. Prepared by adding low molecular weight siloxane (0.039 grams of siloxane (2)).

A piece of cotton fabric to be tested (6 grams) was treated with 0.2 weight percent (by fabric weight) of a silicone softener (polydimethylmethyl (aminoethylamino-isobutyl) siloxane with a viscosity of 1500 cs.).

80 grams of water was added to the laundry container first. Next, a dyed fabric treated with a softening agent, 0.3 grams of washing solution, and 0.03 grams of 50% NaOH were added and stirred at a temperature of 90 ° C. for 60 minutes. The wash solution was drained and the fabric was rinsed with water. 0.014 grams of 60% acetic acid was added to neutralize the fabric. The fabric was rinsed again with water and dried.

By observing the dried fabric, the water was dropped to find complete removal of the silicone softener and there was no difference between the new dyeing fabric and the redyed fabric after removal of the silicone softener.

The method of the present invention can remove any greasy and / or oil stains from the fabric and remove the silicone retained in the fabric.

Claims (17)

Formula 1 (Formula 1) CH ₃ [(CH ₃ ) ₂ SiO] _n Si (CH ₃ ) ₂ CH ₃ (Where n is an integer of 1 to 7) A method of washing a fabric comprising applying a composition consisting of a low molecular weight linear siloxane and a cationic surfactant represented by to a contaminated fabric and heating it to a temperature lower than the temperature at which the fabric degrades in the presence of an inorganic base compound. The method of claim 1 wherein the cationic surfactant is a quaternary ammonium salt. The method of claim 1 wherein the cationic surfactant is selected from the group consisting of trialkylmethylammonium salts, dialkyldimethylammonium salts and mixtures thereof. The method of claim 1 wherein the cationic surfactant is trilaurylmethylammonium chloride or didecyldimethylammonium chloride. 4. The method of claim 3 wherein the composition further comprises an alkylbenzyldimethylammonium salt in combination with a cationic surfactant. The method of claim 1 wherein the inorganic base compound is selected from the group consisting of NaOH, KOH, Na ₂ CO ₃ , and NaHCO ₃ . The method of claim 1 wherein the siloxane is selected from the group consisting of dimers, trimers, and tetramers. The method of claim 1 wherein the composition further comprises a nonionic surfactant. The method of claim 1 wherein the composition further comprises an organic solvent. The method of claim 1 wherein the composition is in the form of an emulsion. The method of claim 1 wherein the ratio of low molecular weight linear siloxane to cationic surfactant is in the range of 1:25 to 25: 1. The method of claim 1 wherein the ratio of the low molecular weight linear siloxane to the base compound of the cationic surfactant is in the range of 16: 1 to 16:20. The method of claim 1 wherein the heating temperature is above room temperature. The method of claim 1 wherein the heating temperature is in the range of 80 to 100 ° C. The method of claim 1 wherein the fabric is heated for 30 minutes to 3 hours. The method according to claim 1, which is used for the removal of any greasy and / or oil stains from the fabric. The method of claim 1, which is used for the removal of silicone retained on a fabric.