JPWO2020203587A1 - 複合凝集体粒子、並びに、それを用いた吸着材、成形体および浄水器 - Google Patents
複合凝集体粒子、並びに、それを用いた吸着材、成形体および浄水器 Download PDFInfo
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Abstract
Description
細孔体積(ml/g)≧0.0010×D50(μm)+1.60
本実施形態の複合凝集体粒子は、非晶質チタノシリケート化合物又はアルミノシリケート化合物からなる微粒子化合物(a1)と、プラスチック粉末(a2)とを含む、複合凝集体粒子であって、前記プラスチック粉末(a2)が前記微粒子化合物(a1)の表面の少なくとも一部に付着していること、並びに、前記複合凝集体粒子の細孔体積と平均粒子径D50が次式を満たしていることを特徴とする。
細孔体積(ml/g)≧0.0010×D50(μm)+1.60
細孔体積(ml/g)≧0.0010×D50(μm)+1.60
を満たす複合凝集体粒子を得ることができる。
細孔体積(ml/g)≧0.0010×D50(μm)+1.60
の式を満たすようにすることで、複合凝集体粒子の単位体積当たりの水と接触頻度が高くなり、微粒子化合物が本来有している吸着性能がより有効に活用できるようになると推定される。そのため、本実施形態の複合凝集体粒子は非常に高い鉛イオン除去性能を有する。
微粒子化合物(a1)、プラスチック粉末(a2)、複合凝集体粒子の粒径はレーザー回折測定法により測定した。方法としては、測定物、界面活性剤、およびイオン交換水とを混合した分散液を、レーザー回折・散乱式 粒子径分布測定装置(マイクロトラック・ベル(株)社製「MT3300 II」)を用いて透過法にて測定した。なお分散液濃度は同装置で表示される測定濃度範囲に収まるように調整した。また、分散液調製時の界面活性剤には、和光純薬工業(株)社製「ポリオキシエチレン(10)オクチルフェニルエーテル」を用い、測定に影響する気泡などが発生しない適当量添加した。分析条件を以下に示す。
測定回数;1回
測定時間;30秒
分布表示;体積
粒径区分;標準
計算モード;MT3000 II
溶媒名;WATER
測定上限;2000μm、測定下限;0.021μm
残分比;0.00
通過分比;0.00
残分比設定;無効
粒子透過性;透過
粒子屈折率;1.81
粒子形状;非球形
溶媒屈折率;1.333
DV値;0.0150〜0.0700
透過率(TR);0.700〜0.950。
微粒子化合物(a1)、プラスチック粉末(a2)、及び、複合凝集体粒子それぞれを上記測定にかけ、粒度分布測定で得られた体積基準の累積分布が50%となる粒子径を、それぞれの平均粒子径D50とした。
複合凝集体粒子の40μm以下の粒子の割合は、前記粒度分布測定で得られた体積基準の累積分布から求めた。本実施形態の複合凝集体粒子は、40μm以下の粒子が前記体積粒度分布において15体積%以下であることが好ましく、10体積%以下であることがより好ましい。上記範囲を満たすと、微粒子化合物由来の成分の溶出を低減しやすい。特に、微粒子化合物(a1)として、アルミノシリケート化合物を用いる場合、前記効果を発揮する。上記範囲は、微粒子化合物(a1)の10μm以下の粒子をサイクロン等で低減する(例えば10体積%以下)、あるいは、複合凝集体粒子を適切なサイズの篩い分け器で篩い分けることによって調整することができる。
質量あたりの細孔体積を、水銀圧入法細孔容積測定装置(マイクロメリティックス社製「MicroActive AutoPore V 9600」)を用い、測定した。水銀圧は0.10psiaから61000.00psiaとした。
本実施形態の吸着材は、上述の複合凝集体粒子と活性炭とを含むことを特徴とする。
細孔体積(ml/g)≧0.0010×D50(μm)+1.60
微粒子化合物として、非晶質チタノシリケート化合物(BASF社製「ATS」、平均粒子径20μm)1kgと、プラスチック粉末として、ポリエチレン(PE)粉末(住友精化株式会社製「フローセン」UF−1.5N、MFR1.4g/10分間、融点110℃、平均粒子径20μm)75gとを均一に混合した。この混合物を160℃の温度で、加熱乾燥機を使用して1時間加熱した後、温度を60℃以上に維持したまま、解砕機で解砕した。その後、室温まで冷却し、篩い分け機で篩い分けを行った。メッシュサイズを変更することによって、表1に示すような平均粒子径D50と細孔体積を有する、実施例1〜5の複合凝集体粒子を得た。揮発分(PE含有量)は、いずれも19%であった。
微粒子化合物として、アルミノシリケート化合物(株式会社シナネンゼオミック製「ゼオミック」LH210N、平均粒子径32μm)1kgと、プラスチック粉末として、ポリエチレン(PE)粉末(住友精化株式会社製「フローセン」UF−1.5N、MFR1.4g/10分間、融点110℃、平均粒子径20μm)75gとを均一に混合した。この混合物を160℃の温度で、加熱乾燥機を使用して1時間加熱した後、温度を60℃以上に維持したまま、解砕機で解砕した。その後、室温まで冷却し、篩い分け機で篩い分けを行った。メッシュサイズを変更することによって、表1に示すような平均粒子径D50と細孔体積を有する、実施例6〜8の複合凝集体粒子を得た。揮発分(PE含有量)は、いずれも19%であった。
複合凝集体粒子を製造する際に、微粒子化合物とポリエチレン粉末の混合物を160℃の温度で、加熱乾燥機を使用して1時間加熱した後、室温まで冷却してから篩い分けを実施した以外は、実施例1〜3と同様にして、比較例1〜3の複合凝集体粒子を得た。
以上のようにして得た、実施例および比較例それぞれの複合凝集体粒子1.4gと、粒状活性炭(株式会社クラレ製「クラレコール」GW60/150(粒子径0.25mm〜0.1mm、比表面積800m2/g)又はGW48/100(粒子径0.3mm〜0.15mm、比表面積800m2/g))26.6gとを均一に混合し、それぞれの実施例および比較例の吸着材とした。
表1の結果より、実施例の複合凝集体粒子を用いた吸着材では、非常に優れた鉛除去性能を示すことが確認できた。
微粒子化合物として、アルミノシリケート化合物(株式会社シナネンゼオミック製「ゼオミック」LH210N、平均粒子径32μm)(アルミノシリケート1)1kgと、プラスチック粉末として、ポリエチレン(PE)粉末(住友精化株式会社製「フローセン」UF−1.5N、MFR1.4g/10分間、融点110℃、平均粒子径20μm)110gとを均一に混合した。この混合物を160℃の温度で、加熱乾燥機を使用して1時間加熱した後、温度を60℃以上に維持したまま、解砕機で解砕した。その後、室温まで冷却し、篩い分け機で篩い分けを行った。揮発分(PE含有量)は、23%であった。
微粒子化合物として、アルミノシリケート化合物(株式会社シナネンゼオミック製「ゼオミック」LH210N、平均粒子径30μm)をボールミルにより粉砕し、平均粒子径を30μm、10μm以下の体積粒度分布による割合を6体積%としたもの(アルミノシリケート2)、平均粒子径を27μm、10μm以下の体積粒度分布による割合を13体積%としたもの(アルミノシリケート3)、平均粒子径を24μm、10μm以下の体積粒度分布による割合を21体積%としたもの(アルミノシリケート4)をそれぞれ用いた以外は、実施例9と同様にして複合凝集体粒子を得た。揮発分(PE含有量)は、23%であった。得られた複合凝集体微粒子を用い、実施例9と同様にしておよび吸着材を得た。実施例9と同様に鉛イオン除去性能及びアルミニウム溶出量を測定した。結果を表2に示す。
表2の結果より、本発明の複合凝集体粒子は、40μm以下の粒子の割合が前記体積粒度分布において一定以下であれば、鉛除去性能に加えて、さらに微粒子化合物由来の成分の溶出を抑制できることが示された。
Claims (11)
- 非晶質チタノシリケート化合物又はアルミノシリケート化合物のうち、少なくとも1種類からなる微粒子化合物(a1)と、プラスチック粉末(a2)とを含む、複合凝集体粒子であって、
前記プラスチック粉末(a2)が前記微粒子化合物(a1)の表面の少なくとも一部に付着していること、並びに、
前記複合凝集体粒子の細孔体積と平均粒子径D50が次式を満たしていることを特徴とする、複合凝集体粒子。
細孔体積(ml/g)≧0.0010×D50(μm)+1.60 - 平均粒子径D50が50μm〜1mmである、請求項1に記載の複合凝集体粒子。
- 前記プラスチック粉末(a2)の含有量が3質量%以上、40質量%以下である、請求項1または2に記載の複合凝集体粒子。
- 前記微粒子化合物(a1)の平均粒子径D50が200μm以下である、請求項1〜3のいずれかに記載の複合凝集体粒子。
- 前記プラスチック粉末(a2)が熱可塑性樹脂である、請求項1〜4のいずれかに記載の複合凝集体粒子。
- 前記熱可塑性樹脂のメルトフローレートが0.02g/10分以上で40g/10分以下である、請求項5記載の複合凝集体粒子。
- 前記熱可塑性樹脂がポリエチレンである、請求項5又は6記載の複合凝集体粒子。
- 請求項1〜7のいずれかに記載の複合凝集体粒子と、活性炭とを含む、吸着材。
- 請求項8に記載の吸着材を含有する、成形体。
- 請求項8に記載の吸着材を備える、浄水器。
- 鉛イオン除去性能が、空間速度(SV)1000hr−1において、カートリッジ1mlあたり80リットル以上である請求項10記載の浄水器。
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