JP4897143B2 - Washing water having sterilizing ability and method for producing the same - Google Patents
Washing water having sterilizing ability and method for producing the same Download PDFInfo
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- JP4897143B2 JP4897143B2 JP2001005162A JP2001005162A JP4897143B2 JP 4897143 B2 JP4897143 B2 JP 4897143B2 JP 2001005162 A JP2001005162 A JP 2001005162A JP 2001005162 A JP2001005162 A JP 2001005162A JP 4897143 B2 JP4897143 B2 JP 4897143B2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 199
- 238000005406 washing Methods 0.000 title claims description 27
- 230000001954 sterilising effect Effects 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 230000002378 acidificating effect Effects 0.000 claims description 75
- 238000005868 electrolysis reaction Methods 0.000 claims description 25
- 239000007864 aqueous solution Substances 0.000 claims description 17
- 150000003841 chloride salts Chemical class 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 description 33
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 29
- 229910052801 chlorine Inorganic materials 0.000 description 29
- 230000000844 anti-bacterial effect Effects 0.000 description 21
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 17
- 238000004140 cleaning Methods 0.000 description 14
- 238000002474 experimental method Methods 0.000 description 12
- 239000011780 sodium chloride Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 6
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 239000005708 Sodium hypochlorite Substances 0.000 description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- NUIURNJTPRWVAP-UHFFFAOYSA-N 3,3'-Dimethylbenzidine Chemical compound C1=C(N)C(C)=CC(C=2C=C(C)C(N)=CC=2)=C1 NUIURNJTPRWVAP-UHFFFAOYSA-N 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011086 high cleaning Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Description
【０００１】
【発明の属する技術分野】
本発明は、塩化物塩の水溶液を被電解水として電解生成された強酸性電解水と強アルカリ性電解水からなる殺菌能を有する洗浄水、および、同洗浄水の製造方法に関する。
【０００２】
【従来の技術】
塩化ナトリウム、塩化ナトリウムを主体とする食塩、塩化カリウム、塩化カルシウム等の塩化物塩を溶解した水溶液を被電解水とする有隔膜電解では、強酸性電解水および強アルカリ性電解水が互いに分離した状態で生成される。これらの電解水のうち、強酸性電解水は高い殺菌作用を有することから各種の分野で殺菌水として利用され、また、強アルカリ性電解水は高い洗浄作用を有することから各種の分野で洗浄水として利用されている。
【０００３】
従って、強酸性電解水と強アルカリ性電解水を互いに合体してなる電解水は、それぞれ有する優れた殺菌作用と洗浄作用を併せ有するものと推測され、被洗浄物の殺菌と洗浄を同時に行える洗浄水、すなわち、殺菌能を有する洗浄水としてその提供が要請される。この要請に対処するには、単純には、強酸性電解水と強アルカリ性電解水を適宜の割合で混合する手段や、これらの混合水の洗浄作用を高めるべく高温に保持する手段が想到される。しかしながら、このような単純な混合手段では、強酸性電解水が有する高い殺菌作用が喪失するため、高い殺菌能を有する洗浄水を製造することはできない。
【０００４】
【発明が解決しようとする課題】
強酸性電解水が有する殺菌作用は、電解水中に存在する塩素成分、所謂、有効塩素に起因するものと認められているが、塩素成分は電解水中ではｐＨの異なる領域では種々の異なる形態で存在し、殺菌作用もｐＨの異なる領域では大きく相違にしている。図１は、電解水中に存在する塩素成分の各ｐＨ領域での形態を示すグラフであり、塩素成分は、ｐＨが３．０未満という低い領域ではＣｌ2の形態で多く存在し、ｐＨが３．０〜７．５という中間領域ではＨＯＣｌの形態で多く存在し、ｐＨが７．５を越える高い領域ではＯＣｌ-の形態で多く存在している。
【０００５】
塩素成分は、これらの形態のうちＨＯＣｌの形態で、最も高い殺菌作用を発揮する。また、塩素成分は、Ｃｌ2の形態では殺菌作用が低く、また、ＯＣｌ-の形態でも殺菌作用が低く、かつ、ＯＣｌ-の形態は被洗浄物に対する残留性が高いという問題がある。また、強酸性電解水を高温状態にすると、塩素成分はＣｌ2の形態で揮発して漸次低減して、強酸性電解水は殺菌作用を漸次低減することになる。一方、強アルカリ性電解水の洗浄作用は温度の影響を大きく受け、洗浄作用を向上させるには、強アルカリ性電解水を高温に保持することが好ましい。
【０００６】
このため、殺菌能を有するとともに高い洗浄力を有する洗浄水を製造すべく、単純に、高温に保持した強酸性電解水と高温に保持した強アルカリ性電解水を混合して調製する場合には、製造された洗浄水が適正なｐＨ領域に調製し得たとしても、調製過程での温度の影響により塩素成分がＣｌ2の形態で揮発して、洗浄水はその殺菌作用を大幅に低下することになる。
【０００７】
これらの問題に対処すべく、塩化物塩の水溶液に塩酸等の酸を溶解させた酸性の水溶液を被電解水として採用し、この被電解水を無隔膜電解にてｐＨが５前後の弱酸性電解水を生成する製造方法が提案されている。しかしながら、当該製造方法においては、被電解水のコストが高くて電解水の製造のランニングコストが大幅に増大するという問題があり、また、高い洗浄作用を有する強アルカリ性電解水を単独で生成し得ないという問題がある。
【０００８】
従って、本発明の目的は、強酸性電解水と強アルカリ性電解水を混合してなる温弱酸性電解水で高い殺菌作用を有する洗浄水、換言すれば、弱酸性で殺菌能を有する温洗浄水を提供することにある。
【０００９】
【課題を解決するための手段】
本発明は、殺菌能を有する洗浄水、および、同洗浄水の製造方法に関するものである。しかして、本発明に係る洗浄水は、塩化物塩の水溶液を被電解水として有隔膜電解にて生成された強酸性電解水と塩化物塩の水溶液を被電解水として有隔膜電解にて生成された強アルカリ性電解水を互いに混合してなる洗浄水であって、常温より高く強酸性電解水より高温状態の強アルカリ性電解水を同強酸性電解水に混合してなり、ｐＨが３．０〜７．５の範囲で温度が常温〜７０℃の範囲にあることを特徴とするものである。
【００１０】
また、本発明に係る洗浄水の製造方法は、塩化物塩の水溶液を被電解水として有隔膜電解にて生成された強アルカリ性電解水を貯留タンク内にて加熱して、常温より高く７０℃以下の温度に保温して温強アルカリ性電解水を調製し、当該温強アルカリ性電解水を、塩化物塩の水溶液を被電解水として有隔膜電解にて生成された強酸性電解水に混合して、ｐＨが３．０〜７．５の範囲で温度が常温〜７０℃の範囲にある温弱酸性水に調製することを特徴とするものである。
【００１１】
【発明の作用・効果】
本発明に係る洗浄水は、温弱酸性で高い殺菌作用と高い洗浄作用を保持するものであって、シンクに貯水し撹拌状態で使用する態様や、シャワー等の噴射状態で使用する態様等、種々の使用態様によっても、有効塩素が揮発することがなくて安定な特性を維持し、高い殺菌作用と洗浄作用の両作用を発揮する。これらの使用態様では、洗浄水が強酸性や強アルカリ性ではなく弱酸性であることから、使用者に対する作用もやさしく、使用者に対して何等の悪影響も及ぼすことはない。
【００１２】
また、本発明に係る洗浄水の製造方法においては、強アルカリ性電解水を貯留タンク内にて加熱して保温し、この加熱された強アルカリ性電解水を強酸性電解水に混合してｐＨが３．０〜７．５の範囲で温度が常温〜７０℃の範囲にある温弱酸性水に調製する手段を採っている。このため、温弱酸性水の調製時に、強酸性電解水が含有する塩素成分の揮発が少なくて、有効塩素を十分に残留させることができる。このため、温弱酸性水である洗浄水には、強酸性電解水が含有する有効塩素の残留に起因して高い殺菌作用を有し、かつ、強アルカリ性電解水が有する洗浄作用の残留に起因して高い洗浄作用を有するものとなる。
【００１３】
【発明の実施の形態】
本発明に係る洗浄水は、温弱酸性で高い殺菌作用と高い洗浄作用を保持するものであり、塩化物塩の水溶液を被電解水として有隔膜電解にて、互いに分離して生成される強酸性電解水と強アルカリ性電解水とを混合して調製されているものである。本発明においては、被電解水を調製するための塩化物塩として、塩化ナトリウム、塩化ナトリウムを主体とする食塩、塩化カリウム、塩化カルシウム等のいずれかまたは組み合わせて適宜採用することができる。本実施の形態では、食塩を採用して実施している。
【００１４】
本実施の形態では、食塩の濃度が０．１〜１．０重量％の希薄食塩水であり、希薄食塩水を被電解水とする有隔膜電解により、表１に示す強酸性電解水と強アルカリ性電解水を生成し、この強酸性電解水と強アルカリ性電解水を混合して温弱酸性水に調製して、洗浄水を製造している。
【００１５】
【表１】
本実施の形態では、有隔膜電解により生成された強アルカリ性電解水を一旦貯留タンクに貯留して加熱し、７０℃以下の温度に保温した状態の温強アルカリ性電解水を強酸性電解水に設定量だけ添加して混合する。この場合の温強アルカリ性電解水の強酸性電解水に対する添加量は、強酸性電解水１００ｍＬに対して３０ｍＬ〜９０ｍＬである。これにより、ｐＨが３．０〜７．５で、温度が常温〜７０℃の範囲にある温弱酸性水である洗浄水を製造している。
【００１７】
本実施の形態では、当該洗浄水の製造システム中に、当該洗浄水を使用場所へ供給するための供給経路を備えているとともに、強アルカリ性電解水の単独を使用場所へ供給するための供給経路と、強酸性電解水の単独を使用場所へ供給するための供給経路を備えている。従って、当該洗浄水の製造システムでは、当該洗浄水の使用による殺菌および洗浄処理と、強酸性電解水の単独使用による低い酸性側での殺菌処理と、強アルカリ性電解水の単独を使用による高いアルカリ性側での洗浄処理の三通りの処理を行うことができる。
【００１８】
【実施例】
本実施例では、強酸性電解水（ｐＨ２．６）、酸性電解水（ｐＨ３．０）、弱酸性電解水（ｐＨ５．１）、および、次亜塩素酸ナトリウム水溶液中の塩素成分の揮発状態の経時的変化を検討するための実験（実験１）と、強酸性電解水と強アルカリ性電解水を混合することにより温弱酸性水を調製する場合の、強酸性電解水に対する強アルカリ性電解水の添加量の適正な量を検討するための実験（実験２）を行った。
【００１９】
（実験１）：本実験では、電解水として、強酸性電解水（ｐＨ２．６）、酸性電解水（ｐＨ３．０）、温弱酸性電解水（ｐＨ５．１）、および、次亜塩素酸ナトリウム水溶液（ｐＨ８．９）を使用して、これらの電解水および水溶液を５０℃で開放状態で放置し、放置して一定時間毎の残留する塩素成分の変化量を測定した。得られた結果を表２に示すとともに、図２にグラフで示す。なお、塩素成分の測定にはオルトトリジン測定法を採用した。
【００２０】
本実験で採用した強酸性電解水（ｐＨ２．６）は、希薄食塩水を被電解水とする有隔膜電解にて生成された強酸性電解水であって、５０℃に加熱保持しているものである。また、次亜塩素酸ナトリウム水溶液（ｐＨ８．９）は、純水に次亜塩素酸ナトリウムの試薬を添加して調製して、５０℃に加熱保持しているものである。
【００２１】
本実験で採用している酸性電解水（ｐＨ３．０）は、希薄食塩水を被電解水とする有隔膜電解にて生成された強酸性電解水と強アルカリ性電解水を混合して調製したものであって、加熱して所定温度に保持されている強アルカリ性電解水（温強アルカリ性電解水）を常温の強酸性電解水に添加して、５０℃でｐＨ３．０の酸性に調製しているものである。また、本実験で採用している温弱酸性電解水（ｐＨ５．１）も同様の手段により調製したものであって、加熱して所定温度に保持されている強アルカリ性電解水（温強アルカリ性電解水）を常温の強酸性電解水に添加して、５０℃でｐＨ５．１の弱酸性に調製しているものである。これらの酸性電解水（ｐＨ３．０）および弱酸性電解水（ｐＨ５．１）の調製においては、強酸性電解水中の塩素成分の揮発を抑制するため、高温に保持されている温強アルカリ性電解水を強酸性電解水中に添加する手法を採って、強酸性電解水の弱酸性化と温度の上昇とのバランスを図って、塩素成分の揮発を抑制している。
【００２２】
【表２】
表２および図２のグラフを参照すると、電解水のｐＨが３．０であれば、酸性電解水を長時間放置していても、酸性電解水中には多くの量の塩素成分が残留していて、殺菌作用を発揮するＨＯＣｌの形態（有効塩素）を保持している。また、塩素成分が殺菌作用を発揮するＨＯＣｌの形態を保持するｐＨの領域は図１のグラフに示しているが、電解水がｐＨ３．０では高い割合でＨＯＣｌの形態を保持している。また、電解水のｐＨが５．１の場合の長時間の放置による塩素成分の残存量（有効塩素量）は、ｐＨが３．０の場合に比較して一層多くなる。ｐＨ値の上限は、図１のグラフを参照すれば、塩素成分が殺菌作用を発揮するＨＯＣｌの形態の割合が高いｐＨ７．５である。
【００２４】
従って、高い殺菌作用と洗浄作用を有する、本発明が意図している殺菌能を有する洗浄水は、ｐＨが３．０〜７．５の範囲のものであることが好ましく、特に、ｐＨが４．０〜６．０の範囲であることが好ましい。なお、本発明においては、ｐＨが３．０〜７．５の範囲の電解水を弱酸性電解水と称している。弱酸性電解水の温度については、常温〜７０℃の範囲にあり、この温度範囲は洗浄水としての使用上の洗浄効果の良好な範囲であり、かつ、洗浄作業上の温度範囲である。
【００２５】
（実験２）：本実験は、温弱酸性電解水を調製する場合の強酸性電解水に対する強アルカリ性電解水の添加量の適正量を検討する実験であり、強酸性電解水（ｐＨ２．６）と強アルカリ性電解水（ｐＨ１１．４）を使用して、常温の強酸性電解水（ｐＨ２．６）１００ｍＬ中に、加熱して５０℃に保持されている強アルカリ性電解水を設定された各容量（ｍＬ）を添加してｐＨ、水温、および有効塩素量（ｍｇ／Ｌ）の変化を測定した。得られた結果を表３に示す。なお、塩素成分の測定にはオルトトリジン測定法を採用した。
【００２６】
【表３】
表３を参照すると、常温の強酸性電解水（ｐＨ２．６）１００ｍＬに対して、５０℃の強アルカリ性電解水（ｐＨ１１．４）を添加する場合には、強アルカリ性電解水を３０ｍＬ添加するとｐＨが３．０以上となり、強アルカリ性電解水を９０ｍＬ添加することによりｐＨが７．８になる。すなわち、強酸性電解水（ｐＨ２．６）１００ｍＬに対する強アルカリ性電解水（ｐＨ１１．４）の適正な添加量は、３０ｍＬ〜９０ｍＬの範囲にある。また、この範囲のｐＨ領域では、有効塩素量が２７ｍＬ〜１８ｍＬであり、この範囲の値は十分な殺菌作用を有する値である。
【００２８】
希薄食塩水を被電解水とする有隔膜電解では、被電解水の濃度、電解電流値、電解時間等の電解条件を変更することにより、電解条件の変更に応じてそれぞれ異なる特性の強酸性電解水および強アルカリ性電解水が生成される。しかしながら、同一の電解条件で有隔膜電解して生成される強酸性電解水と強アルカリ性電解水とは、常にほぼ相対的な関係にあることから、同一の電解条件で有隔膜電解して生成される強酸性電解水と強アルカリ性電解水とを採用して弱酸性電解水を調製する場合には、その混合量の適正な範囲は上記した範囲、すなわち、強酸性電解水１００ｍＬに対する強アルカリ性電解水の適正な混合量３０ｍＬ〜９０ｍＬの範囲にほぼ一致する。
【図面の簡単な説明】
【図１】電解水のｐＨと電解水中に存在する塩素成分の形態およびその存在率を示すグラフである。
【図２】各電解水および水溶液の水温５０℃で放置した状態での塩素成分の揮発状態の経時的変化を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning water having a bactericidal ability composed of a strongly acidic electrolyzed water and a strongly alkaline electrolyzed water electrolyzed using an aqueous chloride salt solution as electrolyzed water, and a method for producing the cleaning water.
[0002]
[Prior art]
In diaphragm membrane electrolysis in which an aqueous solution in which a chloride salt such as sodium chloride, sodium chloride, sodium chloride, potassium chloride or calcium chloride is dissolved is electrolyzed, strongly acidic electrolyzed water and strongly alkaline electrolyzed water are separated from each other. Is generated. Among these electrolyzed waters, strongly acidic electrolyzed water has a high bactericidal action and is used as a sterilizing water in various fields, and strong alkaline electrolyzed water has a high washing action and is used as a washing water in various fields. It's being used.
[0003]
Accordingly, the electrolyzed water formed by combining the strongly acidic electrolyzed water and the strongly alkaline electrolyzed water with each other is presumed to have both the excellent sterilizing action and the washing action, and the washing water capable of simultaneously sterilizing and washing the object to be washed. That is, it is required to provide cleaning water having sterilizing ability. In order to cope with this demand, simply means of mixing strongly acidic electrolyzed water and strongly alkaline electrolyzed water at an appropriate ratio, or means of keeping the mixed water at a high temperature so as to enhance the cleaning action of the mixed water are conceived. . However, such simple mixing means loses the high bactericidal action of strongly acidic electrolyzed water, so that it is not possible to produce wash water having a high bactericidal ability.
[0004]
[Problems to be solved by the invention]
The bactericidal action of strongly acidic electrolyzed water is recognized to be due to the chlorine component present in the electrolyzed water, so-called effective chlorine, but the chlorine component exists in various different forms in the electrolyzed water at different pH ranges. However, the bactericidal action is also greatly different in regions where pH is different. FIG. 1 is a graph showing the form of the chlorine component present in the electrolyzed water in each pH region. The chlorine component is present in a large amount in the form of Cl 2 in a low region where the pH is less than 3.0, and the pH is 3 In the intermediate region of .0 to 7.5, a large amount exists in the form of HOCl, and in a region where the pH is higher than 7.5, a large amount exists in the form of OCl − .
[0005]
The chlorine component exhibits the highest bactericidal action in the form of HOCl among these forms. Further, the chlorine component, low bactericidal action in the form of Cl 2, also OCl - low bactericidal action in the form, and, OCl - forms a problem of high residual resistance to the object to be cleaned. Further, when the strongly acidic electrolyzed water is brought to a high temperature state, the chlorine component volatilizes in the form of Cl 2 and gradually decreases, and the strongly acidic electrolyzed water gradually decreases the bactericidal action. On the other hand, the washing action of the strongly alkaline electrolyzed water is greatly affected by the temperature, and in order to improve the washing action, it is preferable to keep the strongly alkaline electrolyzed water at a high temperature.
[0006]
For this reason, in order to produce washing water having sterilizing ability and high detergency, simply prepared by mixing strongly acidic electrolyzed water kept at a high temperature and strongly alkaline electrolyzed water kept at a high temperature, Even if the produced wash water can be prepared in an appropriate pH range, the chlorine component volatilizes in the form of Cl 2 due to the temperature during the preparation process, and the wash water significantly reduces its bactericidal action. become.
[0007]
In order to deal with these problems, an acidic aqueous solution in which an acid such as hydrochloric acid is dissolved in an aqueous solution of a chloride salt is adopted as electrolyzed water, and this electrolyzed water is weakly acidic with a pH of around 5 by non-membrane electrolysis. A manufacturing method for generating electrolyzed water has been proposed. However, the production method has a problem that the cost of electrolyzed water is high and the running cost of producing electrolyzed water is greatly increased, and strong alkaline electrolyzed water having a high cleaning action can be produced alone. There is no problem.
[0008]
Accordingly, an object of the present invention, the washing water having high bactericidal activity with by mixing a strongly acidic electrolyzed water and strongly alkaline electrolyzed water temperature slightly acidic electrolyzed water, in other words, temperature washing water having a sterilizing ability by weakly acidic Is to provide.
[0009]
[Means for Solving the Problems]
The present invention relates to cleaning water having sterilizing ability and a method for producing the cleaning water. Accordingly, the washing water according to the present invention is generated by diaphragm electrolysis using strongly acidic electrolyzed water generated by diaphragm membrane electrolysis using an aqueous solution of chloride salt as electrolyzed water and aqueous solution of chloride salt as electrolyzed water. Washing water obtained by mixing the strong alkaline electrolyzed water that has been mixed with the strongly acidic electrolyzed water that is higher than room temperature and higher in temperature than the strongly acidic electrolyzed water, and has a pH of 3.0. The temperature is in the range of room temperature to 70 ° C in the range of ~ 7.5.
[0010]
Further, in the method for producing washing water according to the present invention, strong alkaline electrolyzed water generated by diaphragm membrane electrolysis using an aqueous solution of chloride salt as electrolyzed water is heated in a storage tank, and the temperature is increased from room temperature to 70 ° C. and kept at a temperature below were prepared warm strongly alkaline electrolyzed water, the temperature strongly alkaline electrolyzed water, by mixing an aqueous solution of chloride salt in a strongly acidic electrolytic water produced by the organic membrane electrolysis as the electrolytic water It is characterized by being prepared in warm and weak acidic water having a pH of 3.0 to 7.5 and a temperature of normal temperature to 70 ° C.
[0011]
[Operation and effect of the invention]
The wash water according to the present invention is a mildly acidic and high sterilizing action and maintains a high washing action, such as an aspect of storing water in a sink and using it in a stirring state, an aspect of using it in an injection state such as a shower, etc. Even in various usage modes, effective chlorine does not volatilize and maintains stable characteristics, and exhibits both high bactericidal action and cleaning action. In these modes of use, since the wash water is weakly acidic rather than strongly acidic or strongly alkaline, the effect on the user is gentle, and there is no adverse effect on the user.
[0012]
Further, in the method for producing washing water according to the present invention, the strongly alkaline electrolyzed water is heated in the storage tank and kept warm, and the heated strongly alkaline electrolyzed water is mixed with the strongly acidic electrolyzed water so that the pH is 3. A means for preparing warm and weak acidic water having a temperature in the range of 0.0 to 7.5 and a temperature in the range of room temperature to 70 ° C. is employed. For this reason, at the time of preparation of warm and weak acidic water, there is little volatilization of the chlorine component which strong acidic electrolyzed water contains, and effective chlorine can fully remain. For this reason, the wash water, which is warm and weak acidic water, has a high bactericidal action due to the residual residual effective chlorine contained in the strong acidic electrolyzed water, and the residual cleaning action that the strong alkaline electrolyzed water has. Thus, it has a high cleaning action.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The washing water according to the present invention has a mild acidity, a high bactericidal action and a high washing action, and is a strong acid produced by separating aqueous solutions of chloride salts from each other in diaphragm membrane electrolysis as electrolyzed water. It is prepared by mixing alkaline electrolyzed water and strong alkaline electrolyzed water. In the present invention, as a chloride salt for preparing electrolyzed water, any one or a combination of sodium chloride, sodium chloride mainly containing sodium chloride, potassium chloride, calcium chloride, or the like can be adopted. In the present embodiment, salt is used.
[0014]
In the present embodiment, it is a dilute saline solution having a salt concentration of 0.1 to 1.0% by weight, and strongly acidic electrolyzed water and strong water shown in Table 1 are obtained by diaphragm membrane electrolysis using the diluted saline solution as electrolyzed water. Washing water is produced by producing alkaline electrolyzed water, mixing the strongly acidic electrolyzed water and strong alkaline electrolyzed water to prepare warm and weakly acidic water.
[0015]
[Table 1]
In the present embodiment, strong alkaline electrolyzed water generated by diaphragm electrolysis is temporarily stored in a storage tank and heated, and warm alkaline electrolyzed water kept at a temperature of 70 ° C. or lower is set as strongly acidic electrolyzed water. Add in amounts and mix. In this case, the addition amount of the warm strong alkaline electrolyzed water to the strongly acidic electrolyzed water is 30 mL to 90 mL with respect to 100 mL of the strongly acidic electrolyzed water. Thereby, the wash water which is warm weak acid water whose pH is 3.0-7.5 and whose temperature is in the range of normal temperature to 70 ° C. is manufactured.
[0017]
In the present embodiment, the cleaning water production system includes a supply path for supplying the cleaning water to the place of use and a supply path for supplying strong alkaline electrolyzed water alone to the place of use. And a supply path for supplying strong acidic electrolyzed water alone to the place of use. Therefore, in the washing water production system, the sterilization and washing treatment by using the washing water, the sterilization treatment on the low acid side by using the strongly acidic electrolyzed water alone, and the high alkalinity by using the strong alkaline electrolyzed water alone. Three kinds of cleaning processes can be performed on the side.
[0018]
【Example】
In this example, the volatile state of the chlorine component in the strongly acidic electrolyzed water (pH 2.6), acidic electrolyzed water (pH 3.0), weakly acidic electrolyzed water (pH 5.1), and sodium hypochlorite aqueous solution. Addition of strongly alkaline electrolyzed water to strongly acidic electrolyzed water when preparing warm and weakly acidic water by mixing experiment (experiment 1) for studying changes over time and strong acidic electrolyzed water and strongly alkaline electrolyzed water An experiment (Experiment 2) was conducted to examine an appropriate amount.
[0019]
(Experiment 1): In this experiment, strong electrolytic water (pH 2.6), acidic electrolytic water (pH 3.0), mild acidic electrolytic water (pH 5.1), and sodium hypochlorite were used as electrolytic water. Using an aqueous solution (pH 8.9), the electrolyzed water and the aqueous solution were allowed to stand at 50 ° C. in an open state, and the amount of change in the remaining chlorine component per fixed time was measured. The results obtained are shown in Table 2 and graphically shown in FIG. In addition, the orthotolidine measurement method was employ | adopted for the measurement of a chlorine component.
[0020]
The strongly acidic electrolyzed water (pH 2.6) employed in this experiment is strongly acidic electrolyzed water generated by diaphragm membrane electrolysis using dilute saline as electrolyzed water, and is heated and maintained at 50 ° C. It is. A sodium hypochlorite aqueous solution (pH 8.9) is prepared by adding a sodium hypochlorite reagent to pure water and kept heated at 50 ° C.
[0021]
The acidic electrolyzed water (pH 3.0) used in this experiment was prepared by mixing strongly acidic electrolyzed water generated by diaphragm membrane electrolysis using dilute saline as electrolyzed water and strong alkaline electrolyzed water. In addition, strong alkaline electrolyzed water (warm and strong alkaline electrolyzed water) maintained at a predetermined temperature by heating is added to strongly acidic electrolyzed water at room temperature to prepare an acid having a pH of 3.0 at 50 ° C. Is. Moreover, the warm and weak acidic electrolyzed water (pH 5.1) employed in this experiment was prepared by the same means, and the strongly alkaline electrolyzed water (warm and strong alkaline electrolyzed water maintained at a predetermined temperature by heating. Water) is added to strongly acidic electrolyzed water at room temperature to prepare a weakly acidic solution having a pH of 5.1 at 50 ° C. In preparation of these acidic electrolyzed water (pH 3.0) and weakly acidic electrolyzed water (pH 5.1), in order to suppress volatilization of the chlorine component in strongly acidic electrolyzed water, the warm strong alkaline electrolyzed water kept at high temperature Is added to the strongly acidic electrolyzed water to balance the weak acidification of the strongly acidic electrolyzed water and the temperature rise, thereby suppressing the volatilization of the chlorine component.
[0022]
[Table 2]
Referring to Table 2 and the graph of FIG. 2, if the pH of the electrolyzed water is 3.0, a large amount of chlorine component remains in the acidic electrolyzed water even if the acidic electrolyzed water is left for a long time. Thus, the form of HOCl (effective chlorine) that exhibits a bactericidal action is retained. Further, the pH range where the chlorine component maintains the form of HOCl in which the bactericidal action is exerted is shown in the graph of FIG. 1, but when the electrolyzed water has a pH of 3.0, the form of HOCl is maintained at a high rate. Further, when the pH of the electrolyzed water is 5.1, the residual amount of chlorine component (effective chlorine amount) after standing for a long time is further increased compared to the case where the pH is 3.0. With reference to the graph of FIG. 1, the upper limit of the pH value is pH 7.5 where the proportion of the HOCl form in which the chlorine component exerts a bactericidal action is high.
[0024]
Therefore, it is preferable that the washing water having a high bactericidal action and a washing action and having a bactericidal ability intended by the present invention has a pH in the range of 3.0 to 7.5. It is preferable to be in the range of 0.0 to 6.0. In the present invention, electrolyzed water having a pH in the range of 3.0 to 7.5 is referred to as weakly acidic electrolyzed water. The temperature of the weakly acidic electrolyzed water is in the range of room temperature to 70 ° C., and this temperature range is a good range of the cleaning effect when used as cleaning water, and is the temperature range for cleaning operations.
[0025]
(Experiment 2): This experiment is an experiment for examining the appropriate amount of strongly alkaline electrolyzed water added to strongly acidic electrolyzed water when preparing warm and weakly electrolyzed electrolyzed water, and strongly acidic electrolyzed water (pH 2.6). Each volume of strongly alkaline electrolyzed water that is heated and maintained at 50 ° C. in 100 mL of strongly acidic electrolyzed water (pH 2.6) at room temperature using the alkaline alkaline electrolyzed water (pH 11.4) (ML) was added, and changes in pH, water temperature, and effective chlorine content (mg / L) were measured. The obtained results are shown in Table 3. In addition, the orthotolidine measurement method was employ | adopted for the measurement of a chlorine component.
[0026]
[Table 3]
Referring to Table 3, when adding 50 mL of strongly alkaline electrolyzed water (pH 11.4) to 100 mL of strongly acidic electrolyzed water (pH 2.6) at room temperature, adding 30 mL of strongly alkaline electrolyzed water causes pH to increase. Becomes 3.0 or more, and the pH becomes 7.8 by adding 90 mL of strongly alkaline electrolyzed water. That is, the appropriate amount of strongly alkaline electrolyzed water (pH 11.4) added to 100 mL of strongly acidic electrolyzed water (pH 2.6) is in the range of 30 mL to 90 mL. Moreover, in the pH range of this range, the amount of effective chlorine is 27 mL-18 mL, and the value of this range is a value which has sufficient bactericidal action.
[0028]
In diaphragm electrolysis using dilute saline as electrolyzed water, by changing electrolysis conditions such as the concentration of electrolyzed water, electrolysis current value, electrolysis time, etc., strongly acidic electrolysis with different characteristics depending on the electrolysis conditions change Water and strong alkaline electrolyzed water are produced. However, strong acid electrolyzed water and strong alkaline electrolyzed water generated by diaphragm electrolysis under the same electrolysis conditions are always in a relatively relative relationship, so that they are produced by diaphragm electrolysis under the same electrolysis conditions. When preparing weak acidic electrolyzed water using strong acidic electrolyzed water and strong alkaline electrolyzed water, the appropriate range of the mixing amount is the above-described range, that is, strongly alkaline electrolyzed water for 100 mL of strongly acidic electrolyzed water. This is almost the same as the proper mixing amount of 30 mL to 90 mL.
[Brief description of the drawings]
FIG. 1 is a graph showing the pH of electrolyzed water, the form of chlorine components present in the electrolyzed water, and the abundance thereof.
FIG. 2 is a graph showing temporal changes in the volatilization state of chlorine components in a state where each electrolyzed water and aqueous solution are left at a water temperature of 50 ° C. FIG.
Claims (2)
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| JP2001005162A JP4897143B2 (en) | 2001-01-12 | 2001-01-12 | Washing water having sterilizing ability and method for producing the same |
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