I-Methylcellulose (MC) yinto eqhelekileyo eyenziwa ngamachiza e-polymer, i-ether ye-cellulose eguqulwayo efunyenwe yi-methylating cellulose yendalo. Ngenxa yeempawu zayo ezikhethekileyo zomzimba kunye neekhemikhali, isetyenziswa ngokubanzi kulwakhiwo, ukutya, amayeza, izithambiso, iphepha kunye neengubo.
1. Ukuhlelwa ngokweqondo lokufakela endaweni
Iqondo lokuthatha indawo (DS) libhekiselele kwixabiso eliphakathi lamaqela e-hydroxyl endaweni yawo ngamaqela e-methyl kwiyunithi nganye yeglucose kwi-methylcellulose. Kukho amaqela ama-3 e-hydroxyl kwiringi yeglucose nganye ye-cellulose molekyuli enokutshintshwa ngamaqela e-methyl. Ngoko ke, iqondo lokutshintshwa kwe-methylcellulose lingahluka ukusuka kwi-0 ukuya kwi-3. Ngokwezinga lokutshintshwa, i-methylcellulose inokwahlulwa ibe ngamacandelo amabini: iqondo eliphezulu lokutshintshwa kunye nenqanaba eliphantsi lokutshintshwa.
Iqondo eliphezulu lokutshintshwa kwe-methylcellulose (DS> 1.5): Olu hlobo lwemveliso lunomlinganiselo ophezulu we-methyl substitution, ngoko ke i-hydrophobic, ine-solubility ephantsi kunye nokuchasana kwamanzi. Ihlala isetyenziselwa izinto zokwakha, iingubo kunye nezinye iziganeko ezifuna iqondo elithile le-hydrophobicity.
Iqondo eliphantsi lokutshintshwa kwe-methylcellulose (DS <1.5): Ngenxa yokutshintshwa kwe-methyl encinci, olu hlobo lwemveliso luninzi lwe-hydrophilic, lunonyibiliko olungcono kwaye lunokuchithwa emanzini abandayo. I-methylcellulose ene-low-substitute isetyenziswa ngokubanzi kumashishini okutya kunye namachiza njenge-thickener, emulsifier kunye ne-stabilizer.
2. Ukuhlelwa ngokusetyenziswa
Ngokutsho kokusetyenziswa kwe-methylcellulose kwiinkalo ezahlukeneyo, inokwahlulwa ibe ngamacandelo amabini: i-industrial methylcellulose kunye nokutya kunye ne-pharmaceutical methylcellulose.
I-industrial methylcellulose: Isetyenziswa kakhulu kulwakhiwo, iingubo, ukwenza iphepha, i-ceramics kunye namanye amashishini njenge-thickener, i-adhesive, ifilimu yangaphambili, i-agent yokugcina amanzi, njl. ukuqina; kwishishini leengubo, i-methylcellulose inokunyusa ukuzinza kunye nokusabalalisa kweengubo.
Ukutya kunye ne-methylcellulose yamayeza: Ngenxa yezinto ezingenayo ityhefu kwaye ezingenabungozi, i-methylcellulose isetyenziswe njengesongezo sokutya kunye neyeza. Ekutyeni, i-methylcellulose yinto eqhelekileyo ye-thickener kunye ne-emulsifier ekwazi ukuzinzisa isakhiwo sokutya kunye nokukhusela i-stratification okanye ukuhlukana; kwintsimi yamachiza, i-methylcellulose ingasetyenziselwa igobolondo ye-capsule, i-carrier carrier, kwaye inomsebenzi weziyobisi eziqhubekayo. Ukutya kunye nokukhuseleka kwayo kwenza i-methylcellulose idume kakhulu kule miba mibini.
3. Ukuhlelwa ngokunyibilika
I-Methylcellulose yohlulwe kakhulu ibe ziindidi ezimbini ngokwemiqathango yokunyibilika: uhlobo olunyibilikayo lwamanzi abandayo kunye nohlobo olunyibilikayo lwe-organic.
I-methylcellulose yamanzi abandayo: Olu hlobo lwe-methylcellulose lunokuchithwa emanzini abandayo ukwenza isisombululo esicacileyo, esibonakalayo emva kokuchithwa. Ihlala isetyenziswa kumashishini okutya kunye namayeza njenge-thickener okanye ifilimu yangaphambili. Ukunyibilika kolu hlobo lwe-methylcellulose kuncipha ngokunyuka kwamaqondo obushushu, ngoko ke olu phawu lungasetyenziselwa ulawulo lolwakhiwo xa lusetyenziswa kushishino lokwakha.
I-methylcellulose ye-solvent ye-Organic: Olu hlobo lwe-methylcellulose lunokuchithwa kwii-solvents ze-organic kwaye luhlala lusetyenziswa kwiipeyinti, iingubo kunye nezinye iindawo zoshishino ezifuna i-organic phase media. Ngenxa yezinto ezintle zokwenza ifilimu kunye nokuchasana kweekhemikhali, ifanelekile ukusetyenziswa phantsi kweemeko ezinzima zoshishino.
4. Ukuhlelwa ngobunzima be-molecular (viscosity)
Ubunzima be-molecular of methylcellulose bunempembelelo ebalulekileyo kwiimpawu zayo ezibonakalayo, ngokukodwa ukusebenza kwe-viscosity kwisisombululo. Ngokobunzima be-molecular, i-methylcellulose inokwahlulwa ibe yi-viscosity ephantsi kunye nohlobo oluphezulu lwe-viscosity.
I-methylcellulose ye-viscosity ephantsi: Ubunzima be-molecular buncinci kwaye isisombululo se-viscosity siphantsi. Ihlala isetyenziselwa ukutya, amayeza kunye nezithambiso, ngakumbi kwi-emulsification, ukumiswa kunye nokuqina. I-low-viscosity methylcellulose inokugcina i-fluidity efanelekileyo kunye nokufana, kwaye ifanelekile kwizicelo ezifuna izisombululo ze-viscosity ephantsi.
I-high-viscosity methylcellulose: Inobunzima obukhulu be-molecular kwaye yenza isisombululo esiphezulu se-viscosity emva kokuchithwa. Ihlala isetyenziselwa izinto zokwakha, iingubo kunye nokunamathiswa kwezoshishino. I-high-viscosity methylcellulose inokunyusa ngokufanelekileyo amandla omatshini, ukuxhatshazwa kokugqoka kunye nokunamathela kwisisombululo, ngoko isetyenziswa ngokubanzi kwizinto ezifuna amandla aphezulu kunye nokuxhatshazwa okuphezulu.
5. Ukuhlelwa ngokweqondo lokuguqulwa kweekhemikhali
I-Methylcellulose yinto ephuma kwi-cellulose eguqulwe ngamachiza. Ngokwendlela yokuguqulwa kunye neqondo, inokwahlulwa ibe yi-methyl cellulose enye kunye ne-composite modified cellulose.
I-methyl cellulose enye: ibhekisa kwi-cellulose ethers ezifakwe endaweni ye-methyl kuphela. Olu hlobo lwemveliso luneempawu ezizinzileyo zomzimba kunye neekhemikhali, kwaye ukunyibilika kwayo, ukuqina kunye neempawu zokwenza ifilimu zilungile.
I-cellulose eguqulwayo ehlanganisiweyo: Ukongeza kwi-methylation, iphinda iphathwe ngamachiza, njenge-hydroxypropylation, i-ethylation, njl., ukwenza imveliso eguqulweyo edibeneyo. Ngokomzekelo, i-hydroxypropyl methylcellulose (HPMC) kunye ne-carboxymethyl cellulose (CMC). Ezi zixhobo ze-cellulose eziguqulwayo zihlala zine-solubility engcono yamanzi, ukumelana nobushushu kunye nokuzinza, kwaye ziyakwazi ukulungelelanisa uluhlu olubanzi lweemfuno zoshishino.
6. Ukuhlelwa ngokweshishini lesicelo
Ukusetyenziswa okubanzi kwe-methylcellulose ivumela ukuba ihlelwe ngokweempawu zayo zokusebenza kumashishini ahlukeneyo.
I-methylcellulose yoshishino lolwakhiwo: Isetyenziswa kakhulu kwimathiriyeli esekwe kwisamente kunye negypsum njengendawo yokugcina amanzi kunye ne-thickener. Inokuphucula ukusebenza kwezixhobo zokwakha, ukuthintela ukulahleka kwamanzi kwangoko, kunye nokwandisa amandla omatshini weemveliso ezigqityiweyo.
Ishishini lokutya i-methylcellulose: Njenge-emulsifier, i-thickener kunye ne-stabilizer ekusebenzeni kokutya. Inokuthintela ukulahleka kwamanzi, ukuphucula incasa kunye nesakhiwo sokutya, kwaye yandise ubomi beshelufu yokutya.
Ishishini lamachiza i-methylcellulose: Njengesibophelelo sethebhulethi okanye into ekhutshwa ngokuqhubekayo kumachiza. I-Methylcellulose ingasetyenziselwa ukulungiswa kweziyobisi zesisu njengomphathi weziyobisi okhuselekileyo nosebenzayo.
I-Methylcellulose ye-Cosmetic industry: Kwiimveliso zokunakekelwa kwesikhumba kunye nezithambiso, i-methylcellulose isetyenziselwa i-thickener, i-emulsifier kunye ne-moisturizer ukunceda iimveliso zenze ukuthungwa okuthambileyo kunye nokugudileyo ngelixa kwandisa umphumo wokufuma.
Isishwankathelo, kukho iindlela ezininzi zokwahlula i-methylcellulose, enokuthi ihlelwe ngokweempawu zayo zesakhiwo sekhemikhali, okanye ngokwemimandla yesicelo kunye neempawu ze-solubility. Ezi ndlela ezahlukeneyo zokuhlela zisinceda ukuba siqonde ngcono iimpawu kunye nemisebenzi ye-methylcellulose, kwaye ibonelela ngesiseko sethiyori sokusetyenziswa kwayo kwiinkalo ezahlukeneyo.
Ixesha lokuposa: Oct-23-2024