Yenziwe ngantoni i-hydroxypropyl methylcellulose?

I-Hydroxypropyl methylcellulose (HPMC) yi-polymer eguquguqukayo nesetyenziswa kakhulu kumashishini ahlukeneyo, eyaziwa ngeempawu zayo ezizodwa kunye nokusetyenziswa kwayo. Le compound yi-derivative ye-cellulose, i-polymer yendalo efumaneka kwiindonga zeeseli zezityalo. Ukuze uqonde ukwakheka kwe-hydroxypropylmethylcellulose, kuyimfuneko ukuphonononga isakhiwo kunye nokuhlanganiswa kwesi sidalwa se-cellulose.

Ulwakhiwo lwe-cellulose:

I-Cellulose yi-carbohydrate eyinkimbinkimbi equlathe uthotho oluthe ngqo lweeyunithi ze-β-D-glucose ezidityaniswe ziibhondi ze-β-1,4-glycosidic. Ezi bhondi zeglucose zibanjwe kunye ziibhondi ze-hydrogen ukuze zenze isakhiwo esithe ngqo esithe ngqo. I-Cellulose yinxalenye ephambili yesakhiwo seendonga zeeseli zezityalo, inika amandla kunye nokuqina kwiiseli zezityalo.

Izinto ezithathwe kwiHydroxypropyl Methylcellulose:

I-hydroxypropyl methylcellulose yenziwa ngokuguqula i-cellulose ngokweekhemikhali nokungenisa amaqela e-hydroxypropyl kunye ne-methyl kwikhonkco eliphambili le-cellulose. Imveliso idla ngokuquka la manyathelo alandelayo:

Impendulo ye-Etherification:

I-Methylation: Ukunyanga i-cellulose ngesisombululo se-alkaline kunye ne-methyl chloride ukuze kungeniswe amaqela e-methyl (-CH3) kumaqela e-hydroxyl (-OH) e-cellulose.

I-Hydroxypropylation: I-Methylated cellulose iphinda iphendulane ne-propylene oxide ukuze ingenise amaqela e-hydroxypropyl (-CH2CHOHCH3) kwisakhiwo se-cellulose. Le nkqubo iphucula ukunyibilika kwamanzi kwaye itshintsha iimpawu zomzimba ze-cellulose.

ukucoca:

Emva koko i-cellulose eguquliweyo iyacocwa ukuze kususwe naziphi na ii-reagents ezingaphendulwanga, iimveliso ezishiyekileyo okanye ukungcola.

Ukomisa nokugaya:

I-hydroxypropyl methylcellulose ecociweyo iyomiswa ize igaywe ibe ngumgubo ocolekileyo olungele ukusetyenziswa kwiindlela ezahlukeneyo zokusebenza.

Izithako zeHydroxypropyl Methylcellulose:

Ukwakheka kwe-hydroxypropyl methylcellulose kubonakaliswa lizinga lokutshintshwa, elibhekisa kwinqanaba apho amaqela e-hydroxypropyl kunye ne-methyl athatha indawo yamaqela e-hydroxyl kwikhonkco le-cellulose. Amanqanaba ahlukeneyo e-HPMC anamanqanaba ahlukeneyo okutshintshwa, okuchaphazela ukunyibilika kwawo, i-viscosity kunye nezinye iimpawu.

Ifomula yekhemikhali ye-hydroxypropyl methylcellulose ingachazwa ngolu hlobo (C6H7O2(OH)3-mn(OCH3)m(OCH2CH(OH)CH3)n)_x, apho u-m kunye no-n bamele inqanaba lokutshintshwa.

m: inqanaba le-methylation (amaqela e-methyl ngeyunithi yeglucose)

n: idigri ye-hydroxypropylation (amaqela e-hydroxypropyl ngeyunithi yeglucose)

x: inani leeyunithi zeglucose kwikhonkco le-cellulose

Iimpawu kunye nezicelo:

Ukunyibilika: I-HPMC iyanyibilika emanzini, kwaye izinga lokutshintshwa kwayo lichaphazela iimpawu zayo zokunyibilika. Yenza isisombululo esicacileyo nesiqinileyo emanzini, nto leyo eyenza ukuba ifaneleke kwiintlobo ngeentlobo zeefomyula.

Ukuqina: Ukuqina kwesisombululo se-HPMC kuxhomekeke kwizinto ezifana nobunzima beemolekyuli kunye nobungakanani bokutshintshwa. Olu phawu lubalulekile kwizicelo ezifana namayeza afuna ukukhululwa okulawulwayo.

Ukwenziwa kweFilimu: I-HPMC inokwenza iifilimu ezincinci njengoko isisombululo somile, nto leyo eyenza ukuba ibe luncedo ekugqumeni kwiimveliso zamayeza, zokutya nakwamanye amashishini.

IziQinisekisi kunye neziQinisekisi: Kwishishini lokutya, i-HPMC isetyenziswa njengesiqinisi kunye nesiqinisi kwiimveliso ezahlukeneyo, kubandakanya iisosi, iidizethi, kunye nezinto ezibhakiweyo.

Ukusetyenziswa kweMithi: I-HPMC isetyenziswa kakhulu kwimixube yamayeza, kuquka iipilisi, iikhaphu, kunye nezisombululo zamehlo, ngenxa yeempawu zayo zokukhululwa ezilawulwayo kunye nokuhambelana kwezinto eziphilayo.

Ulwakhiwo kunye neengubo: I-HPMC isetyenziswa kwizixhobo zokwakha ezifana neemortar, ii-adhesive zethayile kunye neeplasta. Ikwasetyenziswa njengesithambisi kunye nesiqinisi kwipeyinti kunye neengubo.

Iimveliso Zokhathalelo Lomntu: Kwishishini lezinto zokuthambisa nezokhathalelo lomntu, i-HPMC ifumaneka kwiimveliso ezifana neekhrimu, iiloshini kunye neeshampu, apho inika ubume kunye nozinzo.

I-hydroxypropyl methylcellulose ifunyanwa nge-methylation kunye ne-hydroxypropylation ye-cellulose. Yi-polymer eneenjongo ezininzi enokusetyenziswa okubanzi. Iimpawu zayo ezikhethekileyo ziyenza ibe luncedo kumashishini afana namayeza, ukutya, ulwakhiwo kunye nokunyamekela umntu. Ukuguqulwa okulawulwayo kwe-cellulose kunokulungisa iimpawu ze-HPMC, okwenza ibe yinxalenye ebalulekileyo yeemveliso ezininzi esidibana nazo kubomi bethu bemihla ngemihla.