Izakhiwo ze-hydroxypropylll methylcellulose

I-Hydroxypropyl Methylcellulose HPMC uhlobo lwe-nonic cellul cellulase exubile. Ngokungafani ne-ionic methyl carboxyyllyl cellulose exutshwe ether, ayiphenduli ngezinsimbi ezisindayo. Ngenxa yezilinganiso ezihlukile zokuqukethwe kwe-methoxyl nokuqukethwe kwe-hydroxypropyl ku-hydroxypropylllylylylylylyll methylcellulose kanye nezinto ezahlukahlukene, okuqukethwe okuphezulu nge-hydroxypropylylopyly Ukuqukethwe kwalo kusondele kakhulu ku-methyl cellulose, ngenkathi kuphansi Okuqukethwe kwe-methoxyl nokuqukethwe okuphezulu kwe-hydroxypropyl kusondele naleyo ye-hydroxypropylylylylylyll methyl cellulose. Kodwa-ke, ezinhlotsheni ngalunye, yize kutholakala inani elincane kuphela le-hydroxypropyl noma inani elincane le-methoxyl Group, kunomehluko omkhulu ku-solubity ku-solvents ye-organic noma amazinga okushisa asele.

(1) Izakhiwo ze-solibity ze-hydroxypropyllllylylylykl methylcellulose

Isizungu se-hydroxypropyll methylcellulose emanzini hydroxypropylylyrkyl empeleni uhlobo lwe-methylcellulose luguqulwa yi-propylene oxide (Methoxypropylene), ngakho-ke namanje inezindawo ezifanayo njengoba i-methylslene), ngakho-ke inezici ezifanayo ne-methylliselo Kodwa-ke, ngenxa yeqembu le-hydroxypropyl eguquliwe, izinga lokushisa laso le-gelation emanzini ashisayo liphakeme kakhulu kunalelo methyl cellulose. Isibonelo, ukubonwa kwe-hydroxyproprlylm methyllellose aquotule aquellose aquotule aqued degree ds degree ds = 0.43 kanye ne-hydroxypropyll degred degree ds = 0.46 kanye ne-500 ° C. I-°. I-methyl cellulose kumazinga okushisa afanayo inge-55 ° C. Ngokuqondene ne-solubenity yayo emanzini, kuye kwathuthuka kakhulu. Isibonelo, i-hydroxyproppropyllose ye-purverien (ukwakheka kwe-granular 0.2 ~ 0.5mm ngo-20 ° C nge-4% isisombululo esinamanzi esingu-2% se-2%

Ukusetshenziswa kwe-hydroxypropyll methylcellulose ku-organic solvents inhlangano ye-Hydroxypropylylt methylcellulose kuma-organic solvents futhi ingcono kunaleyo ye-methylcellulose. Ngemikhiqizo engenhla kwe-2.1, i-high-viscoxyproppylll methylcellulose equkethe i-hydroxypropylll = 1.5 ~ 1.8 kanye ne-methoxy ds = 0.2 . Kuyancibilika futhi kuma-hydrocarbons ahlanganisiwe anjenge-methylene chloride kanye ne-chloroform, kanye nezinto eziphilayo ezifana ne-acetone, isopropanol kanye diacetone utshwala. I-solubility yayo kuma-organic solvents ingcono kune-solubity yamanzi.

. I-viscosity yomkhiqizo ofanayo iyanda ngokwanda kokuhlushwa. Ngemikhiqizo enezinsimbi ezihlukile ze-molecular ekuhlushweni okufanayo, umkhiqizo onesisindo esikhulu samangqamuzana une-viscosity ephezulu. Ubudlelwano bawo ngokushisa buyafana nalokho kwe-methyl cellulose. Lapho izinga lokushisa likhuphuka, ukubonakala kuqala ukwehla, kepha uma kufinyelela emazingeni okushisa athile,

Ngokuzumayo kuphakama kukhuphuka futhi kwenzeka. Ukushisa kwe-gel kwemikhiqizo ephansi ye-viscosity kuphezulu. kuphezulu. Iphoyinti layo le-gel alihlobene nokubonakala kuphela kwe-ether, kodwa futhi lihlobene nokulinganiswa kokwakheka kwe-Methoxyl Group ne-Hydroxypropp Group in ether kanye nosayizi wenani elihlanganisiwe eliphelele. Kumele kwaziwe ukuthi i-hydroxypropyllylylylyly futhi i-pseudoplastic, futhi isixazululo saso sizinzile emazingeni okushisa asekamelweni ngaphandle kokubonakaliswa ekuboneni ngaphandle kokuthi amathuba okusho okubonakalayo ngaphandle kwe-enzymatic.

. Usawoti ojwayelekile onjenge-chloride, i-bromide, phosphate, nitrate, njll. Kodwa-ke, ukungezwa kosawoti kunethonya elithile ekushiseni kwe-floccation kwesisombululo salo esinamanzi. Lapho kukhula usawoti, izinga lokushisa le-gel liyancipha. Lapho okuhlushwa usawoti kungaphansi kwephuzu le-floccution, i-viscosity yekhambi livame ukwanda. Ngakho-ke, kufakwa inani elithile lesawoti. , ekusetshenzisweni, kungafinyelela umphumela wokuqina ngokwezomnotho ngokwengeziwe. Ngakho-ke, kwezinye izinhlelo zokusebenza, kungcono ukusebenzisa ingxube ye-cellulose ether nosawoti kunokuqoqwa okuphezulu kwesixazululo esiphakeme ukufeza umphumela wokuqina.

. Ingamelana nenani elithile lama-acid akhanyayo, njenge-formic acid, i-acetic acid, i-citric acid, i-soscoric acid, i-boric acid, njll. Kodwa i-acid ehlanganisiwe inomphumela wokunciphisa ukubonwa. I-Alkalis enjenge-caustic soda, i-catash ye-caustic kanye namanzi we-lime ayinawo umphumela kukho, kepha angakhulisa kancane ukubonwa kwesixazululo, bese yehlisa kancane kancane.

. Lezi zinhlaka ze-polymer zifaka i-polyethylene glycol, i-polyvinyl acetate, polysilicone, polymethylvinylsiloxane, i-hydroxyyethyllllsiloxa, ne-hydroxyyethyl cellulose, ne-methyl cellulose. Amakhompiyutha aphezulu wemvelo afana ne-gum arabic, i-loncist bean gum, karaya gum, njll futhi abe nokuhambisana okuhle nesixazululo sayo. I-Hydroxypropylm methylcellulose nayo ingahlanganiswa ne-mannitol ester noma i-sorbittol ester ye-stearic acid noma i-palmitic acid, futhi ingahlanganiswa ne-glycerin, futhi lezi zinhlaka kanye ne-ndroxypropylylylylylyly pricil for mopulellosizer yepulasitiki.

. Ama-Aldehydes enza i-hydroxypropyllllylylyllellelleble ifaka i-formaldehyde, i-adipaldehyde, njll. Lapho usebenzisa i-plyoxal njllini njllini, ngakho-ke i-glyoxal kufanele ikhokhwe ngokushesha, ngakho-ke i-glyoxal ivame ukusetshenziswa njenge-crosslinking i-ejenti ekukhiqizeni kwezimboni. Inani lalolu hlobo lwe-ejenti exhumanisa nesixazululo kungu-0.2% ~ 10% wesisindo se-ether, mhlawumbe i-7% ~ 10%, isibonelo, ama-6% ~ 6% we-Glyoxo afanele kakhulu. Ngokuvamile, ukwelashwa

Ukushisa kungu-0 ~ 30 ℃, futhi isikhathi singu-1 ~ 120min. Ukusabela okuxhumanisa ngokuwela kudinga ukwenziwa ngaphansi kwezimo ze-acidic. Ngokuvamile, ikhambi lingezwa okokuqala nge-inorganic eqinile acid noma i-organic carboxylic acid ukuguqula i-pH yesisombululo cishe esingu-2 ~ 6, mhlawumbe phakathi kuka-4 ~ 6, bese wengeza ama-aldehydes ukufeza ukusabela okuxhumanisayo. I-acid esetshenzisiwe ine-hydrochloric acid, i-sulfuric acid, i-phosphoric acid, i-acetic acid, i-hydroxyacetic acid, i-aceccinic acid acid noma i-acetic acid i-acid, futhi i-formic acid ilungile. I-acid ne-aldehyde nayo ingangezwa ngasikhathi sinye ukuvumela isixazululo ukuthi sibhekane nokuphendula okuxhumanisayo ngaphakathi kwebanga le-PH oyifunayo. Lokhu kusabela kuvame ukusetshenziswa kwinqubo yokugcina yokwelashwa kwinqubo yokulungiselela izitha ze-cellulose. Ngemuva kokuthi i-cellulose ether iyi-infoluble, kulula ukuyisebenzisa

20 ~ 25 ℃ Amanzi okugeza nokuhlanzwa. Lapho umkhiqizo ususetshenziswa, izinto ze-alkaline zingangezwa kwikhambi lomkhiqizo ukuze zilungise i-PH yesisombululo ukuze kube i-alkali, futhi umkhiqizo uzoncibilika kusixazululo ngokushesha. Le ndlela isebenza futhi ekwelapheni le filimu ngemuva kokuthi i-cellulose ether solution yenziwa ngefilimu ukuze ikwenze kube yifilimu elingafakwanga.

. 1, kuzokwehliselwa futhi ngama-enzyme, okusho ukuthi izinga lokufaka esikhundleni seqembu ngalinye ku-cellulose chain afanelwe yunifomu ngokwanele, futhi ama-microorganisms angakhipha i-anhydroglucose group ukuze athole ushukela, njengezakhi zama-microorganisms ukuze amunge. Ngakho-ke, uma izinga lokungena esikhundleni sokufaka esikhundleni se-cellulose lenyuka, ukumelana nokuguguleka kwe-enzymatic of cellulose ether kuzokhula. Ngokusho kwemibiko, ngaphansi kwezimo ezilawulwayo, imiphumela ye-hydrolysis yama-enzymerrlllllylyll methylcellulose (DS = 1.9) ngu-13.2%, i-methylcellulose (DS = 1.66) ngu-3.8%, Futhi i-hydroxyethyl cellulose ingu-1.7%. Kungabonakala ukuthi i-hydroxypropyllylylyll methylcellulose inekhono elinamandla le-enzyme. Ngakho-ke, ukumelana okuhle kwe-enzyme kwe-hydroxypropyllyllylylylylyl, kuhlangene nokungafani kwayo okuhle, ukuqina kanye nezakhiwo ezenziwe ngefilimu, kusetshenziswa izimbobo ze-emulsion zamanzi, njll., Futhi ngokuvamile akudingi ukwengeza ukulondolozwa. Kodwa-ke, ngokugcinwa kwesikhathi eside kwesixazululo noma ukungcoliswa okungenzeka kusuka ngaphandle, okulondoloziwe kungangezwa njengokuqapha, futhi ukukhetha kunganqunywa ngokuya ngezidingo zokugcina zekhambi. I-PhenylMercuric Acetate kanye neManganese FluorilimiLiLiase zisebenza ngokulondolozwa kwezivikelo, kepha bonke banobuthi, ukunaka kumele kukhokhwe ekusebenzeni. Ngokuvamile, 1 ~ 5mg we-phenylmercuph acetate ingangezwa kwisixazululo ilitha ngalinye lomthamo.

. Isixazululo sayo esinamanzi noma isixazululo se-organic solvent sihlanganiswe epuletini yengilazi, futhi kuba namabala futhi sicace bha ngemuva kokomiswa. Nefilimu enzima. Inokumelana kahle nomswakama futhi ihlala iqinile emazingeni okushisa aphezulu. Uma kufakwa i-hygroscopic Plasticizer, ukugcwala kwayo nokuvumelana nezimo kungathuthukiswa. Ngokuya ngcono ukuguquguquka, amapulasitiki afana ne-glycerin ne-sorbibitlol afanele kakhulu. Ngokuvamile, ukugxila kwesixazululo kungu-2% ~ 3%, futhi inani lesesitiki lingu-10% ~ 20% we-cellulose ether. Uma okuqukethwe kwepulasitiki kuphezulu kakhulu, ukucwilisa kokuwohloka komzimba kwe-colloidal kuzokwenzeka ngomswakama ophezulu. Amandla ashubile wefilimu nge

I-Plistic ingezwe inkulu kakhulu kunaleyo ngaphandle kwalesosibili, futhi iyanda ngokwanda kwenani elingeziwe. Ngokuqondene nenhlayiya yefilimu, kukhuphuka nokukhuphuka kwenani lesendi.


Isikhathi sePosi: Nov-24-2022