JP6469293B1 - でん粉組成物、製紙用添加剤及びでん粉組成物の製造方法 - Google Patents
でん粉組成物、製紙用添加剤及びでん粉組成物の製造方法 Download PDFInfo
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Abstract
Description
すなわち、本発明の1つは、でん粉100質量部に対し、0.5〜3質量部の尿素と、0.13〜0.35質量部の酸とを含有するでん粉組成物であって、前記酸は、硫酸と、硝酸及び/又は塩酸とを含み、前記硫酸と、硝酸及び/又は塩酸との質量比が42:58〜87:13の範囲であり、前記でん粉組成物の8質量%糊液のpHが6.5〜8.3であることを特徴とするでん粉組成物を提供するものである。
実施例
<試料の調製>
表1に示した配合で、尿素及び酸(硫酸、硝酸、塩酸)を少量の水に溶解した水溶液を、コーンスターチに均一に添加、混合した後、気流乾燥により水分量約13%のでん粉組成物を得た。なお、試料10は、糊液のpHが表1に記載した通りとなるように糊化時に苛性ソーダをインラインで添加して調製した。
<粘度の測定>
各試料を30質量%濃度になるように水に溶解して水性懸濁液を得た。これを定量ポンプで熱化学変性用の市販「日食でん粉変性装置」に連続的に供給し、同時に0.9Mpaの圧力を有する蒸気を連続的に供給して150℃に加熱して糊化させ、次いでホールディングコイルでこの温度に5分間滞留させて酸加水分解と酸の中和(尿素の加熱分解により生成するアンモニアによる)を進めた。背圧弁を通過させた直後に糊液をフラッシュチャンバーに導き、過剰の蒸気を分離した後、温水を連続的に供給して約65℃の8質量%濃度の糊液を得た。この糊液について、60℃、60rpmの条件でB型粘度計(東機産業社製)を用いて測定した。
<沈殿率の測定>
上記粘度測定に用いた8質量%濃度糊液約10gを遠沈管に採取し、約50℃の温水約40mlにて希釈後に3000rpmで10分間遠心分離を行った。遠心後上澄みを捨て、沈殿を再度、温水約40mlに懸濁し、再度遠心分離した。上澄みを捨て、沈殿を重量既知のアルミカップに蒸留水で流し入れ、105℃で一夜乾燥した。乾燥後の重量を採取重量(沈殿重量)とし、糊液中のでん粉重量(糊液重量×8/100)で割ることで沈殿率(糊液のでん粉のうち沈殿した割合)を求めた。
測定結果を表1に示した。
Claims (5)
- でん粉100質量部に対し、0.5〜3質量部の尿素と、0.15〜0.3質量部の酸とを含有するでん粉組成物であって、前記酸は、硫酸と、硝酸及び/又は塩酸とを含み、前記硫酸と、硝酸及び/又は塩酸との質量比が42:58〜87:13の範囲であり、前記でん粉組成物の8質量%糊液のpHが6.5〜8.3であることを特徴とするでん粉組成物。
- 自家変性処理に用いられる請求項1記載のでん粉組成物。
- 前記でん粉が未加工でん粉である、請求項1又は請求項2に記載のでん粉組成物。
- 請求項1〜3のいずれか1項に記載のでん粉組成物を含有することを特徴とする製紙用添加剤。
- でん粉100質量部に対し、0.5〜3質量部の尿素と、0.15〜0.3質量部の酸とを含有するでん粉組成物の製造方法であって、前記酸として、硫酸と、硝酸及び/又は塩酸とを含み、前記硫酸と、硝酸及び/又は塩酸との質量比が42:58〜87:13の範囲であるものを用い、前記でん粉組成物の8質量%糊液のpHが6.5〜8.3となるように前記酸及び尿素を配合することを特徴とするでん粉組成物の製造方法。
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CN116180488A (zh) * | 2023-02-20 | 2023-05-30 | 浙江景兴纸业股份有限公司 | 一种增强瓦楞纸板表胶淀粉施胶性能的方法和应用 |
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JP2004238523A (ja) * | 2003-02-06 | 2004-08-26 | Nippon Shokuhin Kako Co Ltd | 熱化学変性用澱粉 |
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CN116180488A (zh) * | 2023-02-20 | 2023-05-30 | 浙江景兴纸业股份有限公司 | 一种增强瓦楞纸板表胶淀粉施胶性能的方法和应用 |
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