Methyl Cellulose (MC) agbekalẹ molikula \[C6H7O2(OH) 3-h(OCH3)n1] x Owu ti a ti tunṣe ni a tọju pẹlu alkali, ati methyl chloride ni a lo bi oluranlowo etherification.Lẹhin lẹsẹsẹ awọn aati, a ṣe itọju cellulose ether.Ni gbogbogbo, iwọn aropo jẹ 1.6 ~ 2.0, ati iwọn aropo yatọ.O jẹ ti ether cellulose ti kii-ionic.
1. Methylcellulose jẹ tiotuka ninu omi tutu, omi gbigbona yoo pade awọn iṣoro, ati pe pH ibiti o ti ojutu olomi jẹ iduroṣinṣin pupọ laarin 3/12.Sitashi, guar gomu ati ọpọlọpọ awọn surfactants miiran jẹ ibaramu diẹ sii.Gelation waye nigbati iwọn otutu ba de iwọn otutu gelation.
Idaduro omi ti methylcellulose da lori iye ti a fi kun, iki, didara patiku ati oṣuwọn itusilẹ.Ni gbogbogbo gbooro, kekere, iki giga, idaduro omi giga.Lara wọn, idaduro omi ni ipa ti o ga julọ, ati ipele iki kii ṣe deede taara si idaduro omi.Oṣuwọn itu ni pato da lori iwọn ti iyipada dada ti awọn patikulu cellulose ati itanran ti awọn patikulu.Lara awọn ethers cellulose ti o wa loke, methyl cellulose ati hydroxypropyl methyl cellulose ni idaduro omi giga.
Awọn iyipada iwọn otutu le ṣe pataki ni ipa lori idaduro omi ti methyl cellulose.– Awọn ti o ga awọn iwọn otutu, awọn buru idaduro omi.Ti iwọn otutu amọ ba kọja 40°C, idaduro omi ti methyl cellulose yoo dinku ni pataki, ni pataki ni ipa lori ikole amọ-lile naa.
Methylcellulose ni ipa pataki lori iṣẹ ṣiṣe ati ifaramọ ti amọ.“Arapọ” nihin n tọka si isunmọ laarin ohun elo ohun elo oṣiṣẹ ati sobusitireti ogiri, iyẹn ni, idena rirun ti amọ.Viscosity, agbara rirẹ amọ-lile, ati agbara ti o nilo nipasẹ awọn oṣiṣẹ ti o wa ni lilo tun tobi pupọ, ati ikole amọ ko dara.Methylcellulose ni ifaramọ ni awọn ipele iwọntunwọnsi ninu awọn ọja ether cellulose.
2. Hydroxypropyl methylcellulose (HPMC) [C 6 H 7 O 2 (OH) 3-mn (OCH 3) m, OCH 2 CH (OH) CH 3] n]] hydroxypropyl methyl cellulose Ni awọn ọdun aipẹ, awọn iru ti cellulose ni pọ si ni kiakia.O jẹ ether ti a dapọ cellulose ti kii-ionic ti a pese sile nipasẹ awọn aati lẹsẹsẹ lẹhin alkalization ti alkali owu ti a ti tunṣe, ninu eyiti propylene oxide ati chloride methyl ti lo bi awọn aṣoju etherification.Iwọn aropo jẹ deede 1.2/2.0.Awọn ohun-ini rẹ yatọ ni ibamu si ipin ti akoonu methoxyl ati akoonu hydroxypropyl.
1. Hydroxypropyl methylcellulose ti pin si oriṣi gbigbona ati iru lẹsẹkẹsẹ.Iwọn gelation rẹ ninu omi gbona jẹ pataki ti o ga ju ti methylcellulose lọ.O tun ṣe afihan ilọsiwaju nla lori methylcellulose nigba tituka ninu omi tutu.
Irisi ti hydroxypropyl methylcellulose ni ibatan si iwuwo molikula, ati iwuwo molikula ga.Iwọn otutu tun ni ipa lori iki rẹ, bi iwọn otutu ti n pọ si, iki dinku.Sibẹsibẹ, ipa ti iwọn otutu lori iki jẹ kekere ju ti methyl cellulose lọ.Ojutu jẹ iduroṣinṣin ipamọ ni iwọn otutu yara.
3. Idaduro omi ti hydroxypropyl methylcellulose da lori iye afikun rẹ, viscosity, ati bẹbẹ lọ, ati iye idaduro omi ti iye kanna jẹ ti o ga ju ti methyl cellulose.
4. Hydroxypropyl methylcellulose jẹ iduroṣinṣin si acid ati alkali, ati pe ojutu olomi rẹ jẹ iduroṣinṣin pupọ ni iwọn pH ti 2/12.Išẹ ti omi onisuga caustic ati omi orombo wewe ko ni ipa pupọ, ṣugbọn alkali le mu iwọn itusilẹ rẹ pọ si, ati iki ti pọ si.Hydroxypropyl methylcellulose jẹ iduroṣinṣin si awọn iyọ ti o wọpọ, ṣugbọn nigbati ifọkansi ti ojutu iyọ ba ga, iki ti ojutu hydroxypropyl methylcellulose duro lati pọ si.
Hydroxypropyl methylcellulose ni a le dapọ pẹlu awọn polima-tiotuka omi lati ṣe agbekalẹ aṣọ kan, ojutu iki giga.Bii ọti polyvinyl, sitashi ether, gomu ẹfọ, ati bẹbẹ lọ.
Hydroxypropyl methylcellulose ni resistance enzymu to dara ju methylcellulose, o ṣeeṣe ti ibajẹ enzymatic ti ojutu rẹ jẹ kekere ju ti methylcellulose lọ, ati ifaramọ ti hydroxypropylmethylcellulose si ikole amọ-lile jẹ ti o ga ju ti methylcellulose lọ.ipilẹ cellulose.
Mẹta, hydroxyethyl cellulose (HEC) ti wa ni ṣe lati refaini owu ti a mu pẹlu alkali, ni niwaju acetone, ati ethylene oxide bi etherification oluranlowo.Iwọn rẹ ti aropo jẹ igbagbogbo 1.5 / 2.0.O ni hydrophilicity ti o lagbara ati pe o rọrun lati fa ọrinrin.
1. Hydroxyethyl cellulose jẹ tiotuka ninu omi tutu, ṣugbọn o ṣoro lati tu ninu omi gbona.Ojutu naa jẹ iduroṣinṣin ni iwọn otutu giga ati pe ko ni awọn ohun-ini gel.O le ṣee lo fun igba pipẹ ni amọ-igi otutu ti o ga, ṣugbọn idaduro omi rẹ kere ju ti methyl cellulose lọ.
2. Hydroxyethyl cellulose jẹ iduroṣinṣin si acid gbogbogbo ati alkali.Alkali accelerates awọn oniwe-itu, ati awọn oniwe-iki posi die-die.Pipin rẹ ninu omi jẹ diẹ buru ju ti methyl cellulose ati hydroxypropyl methyl cellulose.
3. Hydroxyethyl cellulose ni o ni ti o dara egboogi-ikele išẹ lori amọ, ṣugbọn fun igba pipẹ, diẹ ninu awọn domestically produced hydroxyethyl cellulose ni significantly kekere išẹ ju methyl cellulose nitori awọn oniwe-nla omi akoonu ati ki o ga eeru akoonu.
4. Carboxymethyl cellulose (CMC) \ [C6H7O2 (OH) 2och2COONa] (owu, ati be be lo) ti adayeba okun ti wa ni mu pẹlu alkali, ati soda chloroacetate ti wa ni lo bi etherification oluranlowo, lẹhin kan lẹsẹsẹ ti lenu awọn itọju, o ti wa ni ṣe sinu ionic. ether cellulose.Iwọn aropo jẹ gbogbogbo 0.4/1.4, ati iwọn ti aropo ni ipa ti o tobi julọ lori iṣẹ ṣiṣe.
Carboxymethyl cellulose ni hygroscopicity giga, ati awọn ipo ipamọ gbogbogbo ni omi diẹ sii.
2. Carboxymethyl cellulose olomi ojutu ko ni gbe jeli, awọn iki dinku nigbati awọn iwọn otutu ga soke, ati awọn iki jẹ irreversible nigbati awọn iwọn otutu koja 50°C.
Iduroṣinṣin rẹ ni ipa pupọ nipasẹ pH.Ni gbogbogbo ti a lo fun amọ gypsum, kii ṣe fun amọ simenti.Ninu ọran ti alkalinity giga, yoo padanu iki rẹ.
Idaduro omi rẹ kere pupọ ju ti methyl cellulose lọ.Amọ gypsum ni ipa idaduro, idinku agbara.Ṣugbọn idiyele ti cellulose carboxymethyl dinku ni pataki ju ti cellulose methyl.
Akoko ifiweranṣẹ: Jan-13-2023