I-Methylcellulose (MC) yinto eqhelekileyo eyenziwe nge-polymer eyenziwe ngeekhemikhali, i-ether ye-cellulose eguquliweyo efunyenwe yi-methylating natural cellulose. Ngenxa yeempawu zayo ezikhethekileyo zomzimba nezekhemikhali, isetyenziswa kakhulu ekwakheni, ekutyeni, kumayeza, kwizinto zokuthambisa, ephepheni nakwiingubo.
1. Uhlu ngokwezinga lokutshintshana
Iqondo lokutshintshwa (DS) libhekisa kwixabiso eliqhelekileyo lamaqela e-hydroxyl athathelwe indawo ngamaqela e-methyl kwiyunithi nganye yeglucose kwi-methylcellulose. Kukho amaqela e-hydroxyl amathathu kwiringi nganye yeglucose yemolekyuli ye-cellulose anokuthathelwa indawo ngamaqela e-methyl. Ke ngoko, iqondo lokutshintshwa kwe-methylcellulose linokwahluka ukusuka ku-0 ukuya ku-3. Ngokweqondo lokutshintshwa, i-methylcellulose inokwahlulwa ibe ngamacandelo amabini: iqondo eliphezulu lokutshintshwa kunye neqondo eliphantsi lokutshintshwa.
I-methylcellulose etshintshayo enezinga eliphezulu (DS > 1.5): Olu hlobo lwemveliso lunezinga eliphezulu le-methyl substitution, ngoko ke alunamanzi, alunyibiliki kakhulu kwaye alunamanzi aneleyo. Ihlala isetyenziswa kwizixhobo zokwakha, kwiingubo nakwezinye iimeko ezifuna inqanaba elithile le-hydrophobicity.
I-methylcellulose engaphantsi kokutshintshwa (DS < 1.5): Ngenxa yokutshintshwa kwe-methyl encinci, olu hlobo lwemveliso luthanda amanzi, lunokunyibilika ngcono kwaye lunokunyibilika emanzini abandayo. I-methylcellulose engaphantsi kokutshintshwa isetyenziswa kakhulu kumashishini okutya namayeza njengesithambisi, i-emulsifier kunye ne-stabilizer.
2. Uhlulo ngokwendlela olusetyenziswa ngayo
Ngokwendlela esetyenziswa ngayo i-methylcellulose kwiinkalo ezahlukeneyo, ingahlulwahlulwa ibe ziindidi ezimbini: i-industrial methylcellulose kunye ne-food and pharmaceutical methylcellulose.
I-methylcellulose yoshishino: Isetyenziswa kakhulu kulwakhiwo, kwiingubo, ekwenzeni amaphepha, kwiiseramikhi nakwamanye amashishini njenge-thickener, i-adhesive, i-film form, i-arhente yokugcina amanzi, njl. Kwishishini lokwakha, i-methylcellulose isetyenziswa kwisamente nakwiimveliso ze-gypsum ukuphucula ukusebenza kolwakhiwo kunye nokuqina; kwishishini leengubo, i-methylcellulose inokunyusa uzinzo kunye nokusasazeka kweengubo.
I-methylcellulose yokutya kunye namayeza: Ngenxa yeempawu zayo ezingenabungozi nezingenabungozi, i-methylcellulose isetyenziswa njengesongezelelo ekutyeni namayeza. Ekutyeni, i-methylcellulose yinto eqhelekileyo yokutyebisa kunye ne-emulsifier enokuzinzisa isakhiwo sokutya kwaye ithintele ukuqhekeka okanye ukwahlukana; kwicandelo lamayeza, i-methylcellulose ingasetyenziswa njengegobolondo le-capsule, umthwali wamayeza, kwaye ikwanomsebenzi wamayeza akhutshwa rhoqo. Ukutyiwa kwayo kunye nokhuseleko lwayo kwenza i-methylcellulose ithandwe kakhulu kwezi ndawo zimbini.
3. Uhlu ngokwendlela yokunyibilika
I-Methylcellulose yahlulwe kakhulu kwiindidi ezimbini ngokwendlela yokunyibilika: uhlobo olunyibilikayo emanzini abandayo kunye nohlobo olunyibilikayo lwe-organic solvent.
I-methylcellulose enyibilikayo emanzini abandayo: Olu hlobo lwe-methylcellulose lunokunyibilikiswa emanzini abandayo ukuze lwenze isisombululo esicacileyo nesiqinileyo emva kokunyibilika. Ihlala isetyenziswa kumashishini okutya namayeza njengesithambisi okanye i-film former. Ukunyibilika kolu hlobo lwe-methylcellulose kuncipha ngobushushu obukhulayo, ngoko ke olu phawu lungasetyenziselwa ulawulo lokwakha xa lusetyenziswa kushishino lokwakha.
I-methylcellulose enyibilikayo kwi-organic solvent: Olu hlobo lwe-methylcellulose lunokunyibilikiswa kwi-organic solvents kwaye luhlala lusetyenziswa kwiipeyinti, kwiingubo nakwezinye iindawo zoshishino ezifuna i-organic phase media. Ngenxa yeempawu zayo ezintle zokwenza ifilimu kunye nokumelana neekhemikhali, ifanelekile ukusetyenziswa phantsi kweemeko ezinzima zoshishino.
4. Uhlulo ngokobunzima bemolekyuli (ukuthamba)
Ubunzima bemolekyuli ye-methylcellulose bunempembelelo enkulu kwiimpawu zayo zomzimba, ingakumbi ukusebenza kwe-viscosity kwisisombululo. Ngokwesisindo semolekyuli, i-methylcellulose inokwahlulwa ibe luhlobo lwe-viscosity ephantsi kunye nohlobo lwe-viscosity ephezulu.
I-methylcellulose ene-viscosity ephantsi: Ubunzima be-molecular buncinci kwaye i-viscosity yesisombululo iphantsi. Ihlala isetyenziswa ekutyeni, kumayeza nakwizinto zokuthambisa, ikakhulu ekuhlanganiseni, ekumiseni nasekuqiniseni. I-methylcellulose ene-viscosity ephantsi inokugcina ukuchaneka okuhle kunye nokufana, kwaye ifanelekile kwizicelo ezifuna izisombululo ezine-viscosity ephantsi.
I-methylcellulose ene-viscosity ephezulu: Inobunzima obukhulu beemolekyuli kwaye yenza isisombululo esine-viscosity ephezulu emva kokunyibilika. Ihlala isetyenziswa kwizixhobo zokwakha, kwiingubo kunye nakwizinto zokuncamathelisa zoshishino. I-methylcellulose ene-viscosity ephezulu inokunyusa ngokufanelekileyo amandla oomatshini, ukumelana nokuguguleka kunye nokunamathela kwesisombululo, ngoko ke isetyenziswa kakhulu kwizixhobo ezifuna amandla aphezulu kunye nokumelana nokuguguleka okuphezulu.
5. Uhlu ngokwezinga lokuguqulwa kweekhemikhali
I-Methylcellulose yi-cellulose derivative eguqulwe ngokweekhemikhali. Ngokwendlela yokuguqulwa kunye nobungakanani bayo, inokwahlulwa ibe yi-single methyl cellulose kunye ne-composite modified cellulose.
I-single methyl cellulose: ibhekisa kwi-cellulose ethers ezithathelwe indawo yi-methyl kuphela. Olu hlobo lwemveliso luneempawu zomzimba nezekhemikhali ezizinzileyo, kwaye iimpawu zayo zokunyibilika, ukuqina kunye nokwenza ifilimu zilungile.
I-composite modified cellulose: Ukongeza kwi-methylation, inyangwa ngamachiza ngakumbi, njenge-hydroxypropylation, i-ethylation, njl.njl., ukuze kwenziwe imveliso edibeneyo ehlengahlengisiweyo. Umzekelo, i-hydroxypropyl methylcellulose (HPMC) kunye ne-carboxymethyl cellulose (CMC). Ezi cellulose ezidibeneyo zidla ngokuba nokunyibilika kwamanzi okungcono, ukumelana nobushushu kunye nozinzo, kwaye zinokuzivumelanisa neemfuno ezahlukeneyo zoshishino.
6. Uhlu ngokweshishini lezicelo
Ukusetyenziswa ngokubanzi kwe-methylcellulose kuvumela ukuba ihlelwe ngokweempawu zayo zokusetyenziswa kwimizi-mveliso eyahlukeneyo.
I-methylcellulose yoshishino lokwakha: Isetyenziswa kakhulu kwizinto ezisekwe kwisamente nakwi-gypsum njengesigcini samanzi nesityebisi. Ingaphucula ukusebenza kwezixhobo zokwakha, ithintele ukulahleka kwamanzi kwangethuba, kwaye yonyuse amandla oomatshini eemveliso ezigqityiweyo.
I-methylcellulose yoshishino lokutya: Njenge-emulsifier, i-thickener kunye ne-stabilizer ekucutshungulweni kokutya. Ingathintela ukulahleka kwamanzi, iphucule incasa kunye nolwakhiwo lokutya, kwaye yonyuse ubomi bokutya obuhlala ixesha elide.
I-methylcellulose yoshishino lwamayeza: Njengesixhobo sokubopha iipilisi okanye isixhobo sokukhupha amayeza rhoqo. I-Methylcellulose ingasetyenziswa nasekulungiseleleni amayeza okugaya ukutya njengomthwali wamayeza okhuselekileyo nosebenzayo.
I-methylcellulose yoshishino lwezithambiso: Kwiimveliso zokhathalelo lolusu kunye nezinto zokuthambisa, i-methylcellulose isetyenziswa njengesithambisi, i-emulsifier kunye ne-moisturizer ukunceda iimveliso zenze ubume obuthambileyo nobuthambileyo ngelixa zandisa isiphumo sokuthambisa.
Ngamafutshane, kukho iindlela ezininzi zokwahlulahlula i-methylcellulose, enokwahlulwa ngokweempawu zayo zesakhiwo seekhemikhali, okanye ngokweendawo zayo zokusetyenziswa kunye neempawu zokunyibilika. Ezi ndlela zahlukeneyo zokwahlulahlula zisinceda siqonde ngcono iimpawu kunye nemisebenzi ye-methylcellulose, kwaye zibonelela ngesiseko sethiyori sokusetyenziswa kwayo kwiinkalo ezahlukeneyo.
Ixesha leposi: Oktobha-23-2024