JP5745303B2 - 抗微生物用水処理剤および水処理方法 - Google Patents
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- Agricultural Chemicals And Associated Chemicals (AREA)
Description
[1]ポリヘキサメチレンビグアナイドと、縮合リン酸、タングステン酸、四ホウ酸、メタケイ酸およびそれらの塩、ならびに炭酸水素塩からなる群から選ばれる少なくとも一種、との反応生成物からなることを特徴とする抗微生物用水処理剤。
[2]前記反応生成物が、多孔質粒子に吸着されてなる[1]に記載の抗微生物用水処理剤。
[3]25℃の水に0.1質量%の濃度で添加した場合に添加1日後の水中の前記ポリヘキサメチレンビグアナイド濃度が1〜200ppmの範囲となる徐放性を有する[1]または[2]のいずれかに記載の抗微生物用水処理剤。
[4][1]〜[3]のいずれかに記載の水処理剤を被処理水と接触させることにより、被処理水における微生物の生育を抑制することを特徴とする水処理方法。
以下、本発明の水処理剤について、更に詳細に説明する。
を有する化合物である。なお繰り返し構造の末端は特に限定されるものではなく、水素原子またはアルキル基等の任意の基であることができる。ポリヘキサメチレンビグアナイドとしては、ヘキサメチレンビグアナイドが平均12個重合した重合体(上記一般式(I)においてn=12)が抗微生物成分として広く用いられており、本発明においても好ましく使用することができる。
ポリヘキサメチレンビグアナイド(前記一般式(I)におけるn=12の重合体)の塩酸塩水溶液(ロンザジャパン株式会社製LONZABAC-BG、固形分20質量%水溶液)22gに、多孔質粒子(非晶質シリカ)を3.0g添加し、8.9gの成分A(ピロリン酸ナトリウム・10水和物)を含む水溶液を100ml添加し、室温下で6時間攪拌した後、ろ過、水洗し、80℃の乾燥器にて一晩乾燥し、ポリヘキサメチレンビグアナイド・ピロリン酸塩が非晶質シリカ粒子に吸着されてなる水処理剤Aを得た。
成分Aの種類および使用量を表1記載のように変更した以外は、上記1−1.と同様の操作を行い、水処理剤B〜D、H〜K、比較水処理剤1、3を得た。
多孔質粒子を使用せず、成分Aの種類および使用量を表1記載のように変更した以外は、上記1−1.と同様の操作を行い、水処理剤E、比較水処理剤2を得た。
多孔質粒子の種類、ならびに成分Aの種類および使用量を表1記載のように変更した以外は、上記1−1.と同様の操作を行い、水処理剤F、Gを得た。
表1に示す水処理剤各0.3gを300mlの水道水に懸濁し、150rpm、25℃にて24時間振盪した。24時間後、上澄み液をサンプリングし、紫外可視分光光度計(日本分光株式会社 V−650)を用いて233nmにおける吸光度を測定し、検量線法により溶出したポリヘキサメチレンビグアナイドの濃度を測定した。結果を表2に示す。
これに対し比較水処理剤1、2は、ポリヘキサメチレンビグアナイドの放出量が本発明の水処理剤と比べて大幅に高かった。比較水処理剤3はポリヘキサメチレンビグアナイドの放出が著しく少なく、水溶性が乏しく実質的に不溶化されていることが確認された。
転動造粒機を用い、表3に記載した種類の結合剤溶液を用いて表3に記載した配合量にて各種粒状体(1〜5mmφ)を作製した。試験No.1〜6では得られた粒状体5gを水道水1000mlの入った容器に投入し、試験No.7では粒状体を添加せず、それぞれ容器を屋外に放置した。1週間に一度、容器中の水を500ml排水し、新たに水道水を500ml追加注入する操作を15週間繰り返した。所定時間毎に水中のポリヘキサメチレンビグアナイドの濃度、生菌数、および藻の発生状況を確認した。水中のポリヘキサメチレンビグアナイドの濃度は前記2.と同様の方法で測定し、生菌数は混釈平板法にて測定した。藻の発生有無は目視により判定した。結果を表4に示す。
これに対し、試験No.4、6においては、被処理水への投入後初期に水処理剤から多量のポリヘキサメチレンビグアナイドが溶出してしまい、水交換に伴い水中の濃度が急激に減少し、多量の微生物の生育および藻の発生が確認された。試験No.5は、抗微生物成分であるポリヘキサメチレンビグアナイドの放出量が著しく少ないため、被処理水において微生物の生育を抑制することはできなかった。
以上の結果から、本発明によれば長期に亘り優れた抗微生物作用を有する水処理剤が提供されることが示された。
Claims (4)
- ポリヘキサメチレンビグアナイドと、縮合リン酸、タングステン酸、四ホウ酸およびメタケイ酸ならびにそれらの塩からなる群から選ばれる少なくとも一種、との反応生成物からなることを特徴とする抗微生物用水処理剤。
- 前記反応生成物が、多孔質粒子に吸着されてなる請求項1に記載の抗微生物用水処理剤。
- 25℃の水に0.1質量%の濃度で添加した場合に添加1日後の水中の前記ポリヘキサメチレンビグアナイド濃度が1〜200ppmの範囲となる徐放性を有する請求項1または2に記載の抗微生物用水処理剤。
- 請求項1〜3のいずれか1項に記載の抗微生物用水処理剤を被処理水と接触させることにより、被処理水における微生物の生育を抑制することを特徴とする水処理方法。
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