I-HPMC okanye i-hydroxypropyl methylcellulose sisithako esisetyenziswa ngeendlela ezahlukeneyo kumashishini ahlukeneyo kuquka amayeza, izinto zokuthambisa kunye nokutya. Isetyenziswa kakhulu njengesithambisi kunye ne-emulsifier, kwaye i-viscosity yayo iyatshintsha ngokuxhomekeke kubushushu obuvezwa kuyo. Kweli nqaku, siza kugxila kubudlelwane phakathi kwe-viscosity kunye nobushushu kwi-HPMC.
Ukuqina kuchazwa njengomlinganiselo wokumelana kolwelo nokuhamba kwamanzi. I-HPMC yinto eqina kancinci enomlinganiselo wokumelana oxhomekeke kwizinto ezahlukeneyo, kuquka ubushushu. Ukuze siqonde ubudlelwane phakathi kokuqina kolwelo kunye nobushushu kwi-HPMC, kufuneka kuqala sazi ukuba le nto yenziwe njani kwaye yenziwe ngantoni.
I-HPMC ivela kwi-cellulose, i-polymer yendalo kwizityalo. Ukuze kuveliswe i-HPMC, i-cellulose kufuneka iguqulwe ngokweekhemikhali nge-propylene oxide kunye ne-methyl chloride. Olu tshintsho luphumela ekwakhiweni kwamaqela e-hydroxypropyl kunye ne-methyl ether kwikhonkco le-cellulose. Isiphumo sisithako esiqinileyo esinokunyibilikiswa emanzini nakwizinto eziphilayo kwaye sisetyenziswa kwiindlela ezahlukeneyo zokusebenza, kubandakanya njengengubo yeepilisi kunye ne-arhente yokuqina kokutya, phakathi kwezinye.
Ubuninzi be-HPMC buxhomekeke kubungakanani bento kunye nobushushu evezwa kubo. Ngokubanzi, ubunzima be-HPMC buyehla xa ubunzima busanda. Oku kuthetha ukuba ubunzima be-HPMC bubangela ubuninzi be-viscosities kunye nobunzima obuchaseneyo.
Nangona kunjalo, ubudlelwane obuchaseneyo phakathi kwe-viscosity kunye nobushushu buyinkimbinkimbi ngakumbi. Njengoko bekutshiwo ngaphambili, i-viscosity ye-HPMC iyanda ngobushushu obuphantsi. Oku kuthetha ukuba xa i-HPMC iphantsi kobushushu obuphantsi, amandla ayo okuhamba ayancipha kwaye iba yi-viscous ngakumbi. Ngokufanayo, xa i-HPMC iphantsi kobushushu obuphezulu, amandla ayo okuhamba ayanda kwaye i-viscosity yayo iyancipha.
Kukho izinto ezahlukeneyo ezichaphazela ubudlelwane phakathi kobushushu kunye ne-viscosity kwi-HPMC. Umzekelo, ezinye izinto ezinyibilikayo ezikhoyo kulwelo zinokuchaphazela i-viscosity, njengoko kunjalo ne-pH yolwelo. Ngokubanzi, nangona kunjalo, kukho ubudlelwane obuchaseneyo phakathi kwe-viscosity kunye nobushushu kwi-HPMC ngenxa yempembelelo yobushushu kwi-hydrogen bonding kunye nokusebenzisana kweemolekyuli ze-cellulose chains kwi-HPMC.
Xa i-HPMC iphantsi kobushushu obuphantsi, imixokelelwane ye-cellulose iba lukhuni ngakumbi, nto leyo ekhokelela ekwandeni kokubopha kwe-hydrogen. Ezi zibopho ze-hydrogen zibangela ukuba ukuxhathisa kwento ukuhamba, ngaloo ndlela kwandisa ukuxinana kwayo. Ngokwahlukileyo koko, xa ii-HPMC ziphantsi kobushushu obuphezulu, imixokelelwane ye-cellulose yaba bhetyebhetye ngakumbi, nto leyo ebangele ukuba imixokelelwane ye-hydrogen ibe mbalwa. Oku kunciphisa ukuxhathisa kwento ukuhamba, nto leyo ebangela ukuba i-viscosity ibe sezantsi.
Kubalulekile ukuqaphela ukuba nangona kukho ubudlelwane obuchaseneyo phakathi kwe-viscosity kunye nobushushu be-HPMC, oku akusoloko kunjalo kuzo zonke iintlobo ze-HPMC. Ubudlelwane obuchanekileyo phakathi kwe-viscosity kunye nobushushu bunokwahluka ngokuxhomekeke kwinkqubo yokwenziwa kunye nomgangatho othile we-HPMC osetyenzisiweyo.
I-HPMC sisithako esisebenza ngeendlela ezininzi esisetyenziswa kakhulu kumashishini ahlukeneyo ngenxa yeempawu zaso zokutyeba kunye nokuxuba. Ukuqina kwe-HPMC kuxhomekeke kwizinto ezininzi, kubandakanya uxinano lwento kunye nobushushu evezwa kuyo. Ngokubanzi, ukuqina kwe-HPMC kuhambelana nobushushu, oko kuthetha ukuba njengoko ubushushu buncipha, ukuqina kuyanda. Oku kungenxa yempembelelo yobushushu kwi-hydrogen bonding kunye nokusebenzisana kweemolekyuli ze-cellulose chains ngaphakathi kwe-HPMC.
Ixesha lokuthumela: Sep-08-2023