JP4387073B2 - Cleaning method for textile products - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、グルコン酸クロルヘキシジンが付着した繊維製品、特に病院で使用される繊維製品の洗浄方法に関する。
【０００２】
【従来の技術】
病院で使用されるシーツ、枕カバー、包帯、病衣、白衣、手術衣等の繊維製品には、消毒薬であるグルコン酸クロルヘキシジン（商品名；ヒビテン）が付着することがある。これら繊維製品は、リネンサプライ等で洗浄された後、病院で再使用されるが、グルコン酸クロルヘキシジンが付着した繊維製品を塩素系漂白剤で漂白すると、グルコン酸クロルヘキシジンが濃黒褐色に変色して除去が困難となる。
【０００３】
このような問題を解決するために、特公昭６０−２４８５９号には、病院衣料を有機酸又は無機酸の酸溶液で洗浄後、次亜塩素酸ソーダを含む洗浄液で洗浄する方法が、特開平１１−２２９２７１号には、病院寝具類を多価カルボン酸又はオキシカルボン酸を含む水溶液で予備洗浄した後、本洗浄する方法が、また特開２０００−９６０９３号には、有機ホスホン酸系キレート剤、有機多価カルボン酸を含有し、２５℃、１重量％水溶液のｐＨが３以下のランドリー用洗浄前処理剤組成物が開示されている。
【０００４】
【発明が解決しようとする課題】
しかし、上記公報の技術を用いても、グルコン酸クロルヘキシジンが付着した病院用繊維製品の塩素系漂白剤による変色は十分に抑制できなかった。
【０００５】
本発明の課題は、グルコン酸クロルヘキシジンが付着した病院用繊維製品の塩素系漂白剤による変色を十分に抑制できる洗浄方法を提供することである。
【０００６】
【課題を解決するための手段】
本発明は、グルコン酸クロルヘキシジンが付着した繊維製品を、硬度２〜１５°ＤＨ、ｐＨ３〜８の液体で予備洗浄した後、アルカリビルダー及び界面活性剤を含む液体で本洗浄する繊維製品の洗浄方法に関する。
【０００７】
【発明の実施の形態】
本発明において、予備洗浄に用いられる液体（以下、予備洗浄用液体という）は、液状の洗浄媒体であり、水を含有するものが好ましい。なお、予備洗浄用液体には、ビルダー等、固体成分が存在していてもよい。
【０００８】
予備洗浄用液体は、硬度が２〜１５°ＤＨ、好ましくは３〜１１°ＤＨ、より好ましくは４〜１０°ＤＨである。ここで、硬度はドイツ硬度であり、これは、水中の硬度成分であるカルシウムとマグネシウムの全量を、ＣａＯ換算でｍｇ／水１００ｍｌで表したものである（単位：°ＤＨ）。
【０００９】
また、予備洗浄用液体は、ｐＨが３〜８、好ましくは５〜８、より好ましくは５〜７である。ここで、ｐＨは、予備洗浄を行う際の予備洗浄液体の温度におけるｐＨである。
【００１０】
予備洗浄用液体は、この範囲の硬度及びｐＨを満たす上で、本発明の効果を損なわない種々の成分を含有することができる。
【００１１】
予備洗浄用液体は、カチオン界面活性剤を含有することが好ましく、カチオン界面活性剤としては、下記一般式（Ｉ）で示される化合物及び／又は下記一般式（II）で示される化合物が好ましい。
【００１２】
【化４】
〔式中、Ｒ1、Ｒ2、Ｒ3、Ｒ4のうち少なくとも１つとＲ5は、炭素数８〜２０のアルキル基又はアルケニル基であり、残余はベンジル基、炭素数１〜５のアルキル基もしくはヒドロキシアルキル基又は下記一般式（III）
【００１４】
【化５】
で表される基であり、Ｘ-は、ハロゲンイオン又は下記一般式（IV）
【００１６】
【化６】
で表される陰イオン（Ｒ6、Ｒ7の少なくとも一方は炭素数６〜２０の直鎖又は分岐鎖のアルキル基又はアルケニル基であり、他方は水素原子、メチル基、エチル基、又は炭素数８〜１８のアルキルリン酸残基である）である。〕。
【００１８】
カチオン界面活性剤は、予備洗浄用液体中に０．０００５〜１重量％、更に０．００１〜０．５重量％、特に０．００２〜０．０５重量％含有されることが好ましい。
【００１９】
また、予備洗浄用液体は、ノニオン界面活性剤を含有することが好ましく、ノニオン界面活性剤としては、下記一般式（Ｖ）で表される化合物が好ましい。
【００２０】
Ｒ8−Ｏ−(ＥＯ)p−(ＰＯ)q−(ＥＯ)r−Ｈ （Ｖ）
〔式中、Ｒ8は平均炭素数８〜１８のアルキル基又はアルケニル基であり、ＥＯはオキシエチレン基、ＰＯはオキシプロピレン基である。ｐ、ｑ、ｒはそれぞれ平均付加モル数であり、ｐ＞０、好ましくはｐ＝２〜１０、ｒ＞０、好ましくはｒ＝２〜１０、ｑ＝１〜６、好ましくはｑ＝１〜５であり、ｐ＋ｑ＋ｒ＝４〜２０、好ましくは６〜１４である〕。
【００２１】
ノニオン界面活性剤は、予備洗浄用液体中に０．０００５〜１重量％、更に０．００１〜０．５重量％、特に０．００２〜０．０５重量％含有されることが好ましい。
【００２２】
その他に、予備洗浄用液体に配合できる成分として、酵素、香料、色素、溶剤、グリコール類、再汚染防止剤、消泡剤等が挙げられる。
【００２３】
本発明において、病院用繊維製品を予備洗浄する条件には特に制限はなく、被洗物の汚れの状態などに応じて適宜選択することができるが、カチオン界面活性剤が上記濃度となるように予備洗浄用液体を使用し、予備洗浄用液体のｐＨ及び硬度を前記範囲とし、予備洗浄用液体の温度を５〜７０℃として、１〜２０分洗浄することが好ましい。
【００２４】
本発明においては、予備洗浄に続いて、アルカリビルダー及び界面活性剤を含む液体（以下、本洗浄用液体という）を用いて本洗浄を行う。この本洗浄用液体も、液状の洗浄媒体であり、水を含有するものが好ましい。なお、本洗浄用液体にも固体成分が存在していてもよい。
【００２５】
本洗浄用液体に用いるアルカリビルダーには特に制限はないが、珪酸、炭酸、リン酸及びこれらの塩、好ましくはナトリウム塩を好適に使用できる。
【００２６】
また、本洗浄用液体に用いる界面活性剤としては、予備洗浄用液体で説明した一般式（Ｉ）で示される化合物及び／又は下記一般式（II）で示される化合物等のカチオン界面活性剤、一般式（Ｖ）で表される化合物等のノニオン界面活性剤の他、α−オレフィンスルホン酸塩、直鎖アルキルベンゼンスルホン酸塩、ポリオキシエチレンアルキル硫酸エステル塩、石鹸などの陰イオン界面活性剤を使用することもできる。
【００２７】
その他に、本洗浄用液体には、漂白剤、消泡剤、蛍光増白剤、酵素などを含むことができる。
【００２８】
本洗浄用液体に用いる漂白剤には特に制限はなく、例えば、過炭酸ナトリウム、過酸化水素、過硼酸ナトリウム、過酸化ナトリウムなどの酸素系漂白剤、次亜塩素酸ナトリウム、亜塩素酸ナトリウム、サラシ粉などの塩素系漂白剤、ハイドロサルファイト、チオ硫酸ナトリウム、重亜硫酸ナトリウムなどの還元漂白剤などを挙げることができる。
【００２９】
それ以外の本洗浄の条件は、被洗物の汚れの状態などに応じて適宜選択することができるが、通常は、被洗物に対してアルカリビルダーが０．００２〜０．２重量％、界面活性剤が０．００１〜０．５重量％となるように、本洗浄用液体を使用し、本洗浄用液体の温度及びｐＨを前記範囲として、１〜２０分洗浄することが好ましい。このような条件で本洗浄を行うことにより、病院用繊維製品の汚れを、再汚染を生ずることなく除去し、さらに良好な漂白効果を発揮することができる。
【００３０】
本洗浄後の被洗物は、公知の方法により濯ぎ、脱水、乾燥を行うことが好ましい。
【００３１】
本発明の洗浄方法は、予備洗浄、本洗浄とも、洗浄機を用いる、自動化された洗浄システムで実施できる。
【００３２】
本発明の洗浄方法の対象となる繊維製品としては、病院で使用されるシーツ、枕カバー、包帯、病衣、白衣、手術衣等の病院用の繊維製品であって、グルコン酸クロルヘキシジンが付着した繊維製品が挙げられる。
【００３３】
【発明の効果】
本発明によれば、消毒薬であるグルコン酸クロルヘキシジンが付着した病院用繊維製品を塩素系漂白剤で漂白洗浄した場合でも、グルコン酸クロルヘキシジンに起因する着色を生ずることなく洗浄することができる。
【００３４】
【実施例】
実施例１〜５及び比較例１〜５
グルコン酸クロルヘキシジンの５重量％水溶液を、１０ｃｍ×１０ｃｍの木綿布に０．５ｇ滴下し、風乾し、人工汚染布とした。この時点で、人工汚染布には肉眼で確認できる汚れは存在しない。
【００３５】
この人工汚染布を表１に示す条件で予備洗浄（４０〜５０℃、５分間）した後、排水、脱水した後、表１に示す条件で本洗浄（６０℃、１０分間）した。
【００３６】
本洗浄後の人工汚染布を乾燥させ、次亜塩素酸ナトリウムの６重量％水溶液を０．５ｇ滴下し、発色させた（発色試験）。
【００３７】
洗浄前の人工汚染布と発色試験後の人工汚染布の５２０ｎｍにおける反射率を、それぞれ測定し、以下の式により白度を算出した。白度が１００に近いほど、発色が小さく良好な結果であることを意味する。
白度＝（発色試験後の人工汚染布の反射率）／（洗浄前の人工汚染布の反射率）×１００
【００３８】
【表１】
（注）
＊１ ノニオン界面活性剤（１）：ポリオキシエチレンラウリルエーテル（花王（株）、エマルゲン１０８）
＊２ ノニオン界面活性剤（２）：日本触媒（株）、ソフタノール７０
＊３ ノニオン界面活性剤（３）：花王（株）、エマルゲンＬＳ１１０
＊４ カチオン界面活性剤：花王（株）、サニゾールＣ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cleaning a textile product to which chlorhexidine gluconate is attached, particularly a textile product used in a hospital.
[0002]
[Prior art]
Disinfectant chlorhexidine gluconate (trade name: Hibiten) may adhere to textile products used in hospitals such as sheets, pillowcases, bandages, sick clothes, lab coats, and surgical clothes. These textile products are washed in a linen supply and then reused in hospitals. However, when a textile product to which chlorhexidine gluconate is attached is bleached with a chlorine bleach, chlorhexidine gluconate turns dark brown and is removed. Becomes difficult.
[0003]
In order to solve such problems, Japanese Patent Publication No. 60-24859 discloses a method in which hospital clothing is washed with an acid solution of an organic acid or an inorganic acid and then washed with a cleaning solution containing sodium hypochlorite. No. 11-229271 discloses a method of pre-washing hospital bedding with an aqueous solution containing a polyvalent carboxylic acid or oxycarboxylic acid, and then this washing method. JP-A 2000-96093 discloses an organic phosphonic acid chelating agent. In addition, a laundry pretreatment composition for laundry containing an organic polyvalent carboxylic acid and having a pH of 3% or less at 25 ° C. in a 1 wt% aqueous solution is disclosed.
[0004]
[Problems to be solved by the invention]
However, even if the technique of the above publication is used, discoloration due to a chlorine bleach of a hospital textile product to which chlorhexidine gluconate is attached cannot be sufficiently suppressed.
[0005]
The subject of this invention is providing the washing | cleaning method which can fully suppress the discoloration by the chlorine bleach of the hospital textiles to which the chlorhexidine gluconate adhered.
[0006]
[Means for Solving the Problems]
The present invention relates to a method for cleaning a textile product in which a textile product to which chlorhexidine gluconate is adhered is pre-washed with a liquid having a hardness of 2 to 15 ° DH and a pH of 3 to 8, and then washed with a liquid containing an alkali builder and a surfactant About.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the liquid used for preliminary cleaning (hereinafter referred to as preliminary cleaning liquid) is a liquid cleaning medium, and preferably contains water. Note that a solid component such as a builder may be present in the preliminary cleaning liquid.
[0008]
The preliminary washing liquid has a hardness of 2 to 15 ° DH, preferably 3 to 11 ° DH, more preferably 4 to 10 ° DH. Here, the hardness is German hardness, which is the total amount of calcium and magnesium, which are hardness components in water, expressed in terms of CaO in mg / 100 ml of water (unit: ° DH).
[0009]
The preliminary cleaning liquid has a pH of 3 to 8, preferably 5 to 8, and more preferably 5 to 7. Here, the pH is the pH at the temperature of the preliminary cleaning liquid when the preliminary cleaning is performed.
[0010]
The pre-cleaning liquid can contain various components that do not impair the effects of the present invention in satisfying the hardness and pH in this range.
[0011]
The preliminary cleaning liquid preferably contains a cationic surfactant, and the cationic surfactant is preferably a compound represented by the following general formula (I) and / or a compound represented by the following general formula (II).
[0012]
[Formula 4]
[Wherein, at least one of R 1 , R 2 , R 3 , R 4 and R 5 are an alkyl group or an alkenyl group having 8 to 20 carbon atoms, the remainder being a benzyl group, an alkyl having 1 to 5 carbon atoms. Group or hydroxyalkyl group or the following general formula (III)
[0014]
[Chemical formula 5]
X − is a halogen ion or the following general formula (IV)
[0016]
[Chemical 6]
At least one of R 6 and R 7 is a linear or branched alkyl group or alkenyl group having 6 to 20 carbon atoms, and the other is a hydrogen atom, a methyl group, an ethyl group, or a carbon number. 8 to 18 alkyl phosphate residues). ].
[0018]
The cationic surfactant is preferably contained in the precleaning liquid in an amount of 0.0005 to 1% by weight, more preferably 0.001 to 0.5% by weight, and particularly preferably 0.002 to 0.05% by weight.
[0019]
The preliminary cleaning liquid preferably contains a nonionic surfactant, and the nonionic surfactant is preferably a compound represented by the following general formula (V).
[0020]
R 8 -O- (EO) p - (PO) q - (EO) r -H (V)
[Wherein, R 8 is an alkyl group or alkenyl group having an average carbon number of 8 to 18, EO is an oxyethylene group, and PO is an oxypropylene group. p, q, and r are average addition mole numbers, respectively, p> 0, preferably p = 2-10, r> 0, preferably r = 2-10, q = 1-6, preferably q = 1. 5 and p + q + r = 4-20, preferably 6-14].
[0021]
The nonionic surfactant is preferably contained in the precleaning liquid in an amount of 0.0005 to 1% by weight, further 0.001 to 0.5% by weight, particularly 0.002 to 0.05% by weight.
[0022]
In addition, examples of components that can be added to the pre-cleaning liquid include enzymes, fragrances, pigments, solvents, glycols, anti-staining agents, and antifoaming agents.
[0023]
In the present invention, there are no particular limitations on the conditions for pre-cleaning the hospital textiles, and the conditions can be appropriately selected according to the state of dirt on the object to be washed. However, the cationic surfactant has the above concentration. It is preferable to use the pre-cleaning liquid, set the pH and hardness of the pre-cleaning liquid in the above ranges, and set the temperature of the pre-cleaning liquid to 5 to 70 ° C. for 1 to 20 minutes.
[0024]
In the present invention, following the preliminary cleaning, the main cleaning is performed using a liquid containing an alkali builder and a surfactant (hereinafter referred to as a main cleaning liquid). This main cleaning liquid is also a liquid cleaning medium, and preferably contains water. A solid component may also be present in the cleaning liquid.
[0025]
Although there is no restriction | limiting in particular in the alkali builder used for this washing | cleaning liquid, Silicic acid, carbonic acid, phosphoric acid, and these salts, Preferably a sodium salt can be used conveniently.
[0026]
Moreover, as the surfactant used in the cleaning liquid, a cationic surfactant such as the compound represented by the general formula (I) and / or the compound represented by the following general formula (II) described in the preliminary cleaning liquid, In addition to nonionic surfactants such as compounds represented by the general formula (V), anionic surfactants such as α-olefin sulfonates, linear alkylbenzene sulfonates, polyoxyethylene alkyl sulfates, soaps, etc. It can also be used.
[0027]
In addition, the cleaning liquid may contain a bleaching agent, an antifoaming agent, a fluorescent brightening agent, an enzyme, and the like.
[0028]
There are no particular restrictions on the bleach used in the cleaning liquid, such as oxygen-based bleach such as sodium percarbonate, hydrogen peroxide, sodium perborate, sodium peroxide, sodium hypochlorite, sodium chlorite, Mention may be made of chlorine-based bleaching agents such as salicin powder, and reducing bleaching agents such as hydrosulfite, sodium thiosulfate and sodium bisulfite.
[0029]
Other conditions for the main cleaning can be appropriately selected according to the state of dirt on the article to be washed, etc., but usually the alkali builder is 0.002 to 0.2% by weight with respect to the article to be washed. It is preferable that the main cleaning liquid is used so that the surfactant is 0.001 to 0.5% by weight, and the temperature and pH of the main cleaning liquid are within the above ranges for 1 to 20 minutes. By performing the main cleaning under such conditions, it is possible to remove the soil of the hospital textiles without causing re-contamination and to exhibit a better bleaching effect.
[0030]
The article to be washed after the main washing is preferably rinsed, dehydrated and dried by a known method.
[0031]
The cleaning method of the present invention can be implemented by an automated cleaning system that uses a washer for both preliminary cleaning and main cleaning.
[0032]
Textile products to be subjected to the cleaning method of the present invention are hospital textile products such as sheets, pillow covers, bandages, sick clothes, lab coats, and surgical clothes used in hospitals, to which chlorhexidine gluconate is attached. Examples include textile products.
[0033]
【The invention's effect】
According to the present invention, even when a hospital textile product to which chlorhexidine gluconate, which is a disinfectant, adheres, is bleach-washed with a chlorine bleach, it can be washed without causing coloring due to chlorhexidine gluconate.
[0034]
【Example】
Examples 1-5 and Comparative Examples 1-5
0.5 g of a 5% by weight aqueous solution of chlorhexidine gluconate was dropped on a 10 cm × 10 cm cotton cloth and air-dried to obtain an artificially contaminated cloth. At this point, the artificially contaminated cloth has no dirt that can be visually confirmed.
[0035]
This artificially contaminated cloth was preliminarily washed (40 to 50 ° C., 5 minutes) under the conditions shown in Table 1, drained and dehydrated, and then subjected to main washing (60 ° C., 10 minutes) under the conditions shown in Table 1.
[0036]
The artificially contaminated cloth after the main cleaning was dried, and 0.5 g of a 6% by weight aqueous solution of sodium hypochlorite was dropped to develop a color (color development test).
[0037]
The reflectance at 520 nm of the artificially contaminated cloth before washing and the artificially stained cloth after the color development test was measured, and the whiteness was calculated by the following equation. The closer the whiteness is to 100, the smaller the color development and the better the result.
Whiteness = (Reflectivity of artificially stained cloth after color development test) / (Reflectivity of artificially stained cloth before washing) × 100
[0038]
[Table 1]
(note)
* 1 Nonionic surfactant (1): Polyoxyethylene lauryl ether (Kao Corporation, Emulgen 108)
* 2 Nonionic surfactant (2): Nippon Shokubai Co., Ltd., Softanol 70
* 3 Nonionic surfactant (3): Kao Corporation, Emulgen LS110
* 4 Cationic surfactant: Kao Corporation, Sanizole C
Claims (5)
Ｒ8−Ｏ−(ＥＯ)p−(ＰＯ)q−(ＥＯ)r−Ｈ （Ｖ）
〔式中、Ｒ8は平均炭素数８〜１８のアルキル基又はアルケニル基であり、ＥＯはオキシエチレン基、ＰＯはオキシプロピレン基である。ｐ、ｑ、ｒはそれぞれ平均付加モル数であり、ｐ＞０、ｒ＞０、ｑ＝１〜６であり、ｐ＋ｑ＋ｒ＝４〜２０である〕The cleaning method according to claim 4, wherein the nonionic surfactant is a compound represented by the following general formula (V).
R 8 -O- (EO) p - (PO) q - (EO) r -H (V)
[Wherein, R 8 is an alkyl group or alkenyl group having an average carbon number of 8 to 18, EO is an oxyethylene group, and PO is an oxypropylene group. p, q, and r are average added mole numbers, respectively, p> 0, r> 0, q = 1-6, and p + q + r = 4-20]
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