IHydroxypropyl methylcellulose (HPMC) yipolymer eguquguqukayo esetyenziswa ngokubanzi njengento etyebisayo kumashishini ahlukeneyo afana namayeza, izinto zokuthambisa, ukutya, kunye nezinto zokwakha.Ukuqonda iimpawu ze-rheological zeenkqubo ze-HPMC ezityebileyo kubalulekile ekuphuculeni ukusebenza kwazo kwizicelo ezahlukeneyo.
1. IViscosity:
Iisistim ze-HPMC ezityebileyo zibonisa isimilo sokucheba, okuthetha ukuba i-viscosity yabo iyancipha ngokunyuka kwesantya sokucheba.Le propati inenzuzo kwizicelo apho isicelo esilula okanye ukucubungula kufuneka, njengepeyinti kunye neengubo.
I-viscosity yezisombululo ze-HPMC iphenjelelwa zizinto ezinje ngoxinaniso lwepolymer, ubunzima bemolekyuli, isidanga sokutshintsha, ubushushu, kunye nesantya sokucheba.
Ngamazinga aphantsi okucheba, izisombululo ze-HPMC ziziphatha njengolwelo lwe-viscous kunye ne-viscosity ephezulu, ngelixa kumazinga aphezulu okucheba, ziziphatha njengolwelo oluncinci, luququzelela ukuhamba lula.
2 Thixotropy:
Thixotropy ibhekisela kwipropati ulwelo ezithile ukuze baphinde viscosity yabo phezu kokuma emva kokuba phantsi koxinzelelo lokucheba.Iinkqubo ze-HPMC ezityebileyo zihlala zibonisa ukuziphatha kwethixotropic.
Xa iphantsi koxinzelelo lwe-chear, amatyathanga e-polymer amade alungelelanisa kwicala lokuhamba, ukunciphisa i-viscosity.Emva kokuphela koxinzelelo lwe-chear, amakhonkco e-polymer ngokuthe ngcembe abuyela kwi-orientation yawo, ekhokelela ekwandeni kwe-viscosity.
Thixotropy inqwenelekayo kwizicelo ezifana neengubo kunye ne-adhesives, apho izinto eziphathekayo zifuna ukugcina ukuzinza ngexesha lokufaka isicelo kodwa zihamba ngokulula phantsi kwe-shear.
3. Uxinzelelo lwezivuno:
Iinkqubo zokujiya ze-HPMC zihlala zinoxinzelelo lwesivuno, olona xinzelelo luncinci lufunekayo ukuqalisa ukuhamba.Ngaphantsi kolu xinzelelo, izinto eziphathekayo ziziphatha njengento eqinile, ebonisa ukuziphatha oku-elastic.
Uxinzelelo lwesivuno lwezisombululo ze-HPMC luxhomekeke kwizinto ezifana noxinzelelo lwepolymer, ubunzima bemolekyuli, kunye nobushushu.
Uxinzelelo lwesivuno lubalulekile kwizicelo apho izinto kufuneka zihlale endaweni ngaphandle kokugeleza phantsi kobunzima bawo, njengeengubo ezithe nkqo okanye ekumisweni kwamasuntswana aqinileyo kwiipende.
4. Uvakalelo lobushushu:
I-viscosity yezisombululo ze-HPMC iphenjelelwa bubushushu, kunye ne-viscosity ehlayo ngokubanzi njengoko ubushushu bonyuka.Oku kuziphatha kufana nezisombululo zepolymer.
Ubuntununtunu bobushushu bunokuchaphazela ukungaguquguquki kunye nokusebenza kweenkqubo ze-HPMC ezityebileyo kwizicelo ezahlukeneyo, ezifuna uhlengahlengiso ekuqulunqweni okanye kwiiparamitha zenkqubo ukugcina iipropathi ezifunwayo kuzo zonke iindidi zamaqondo obushushu.
5. UXhomekeko lweRhafu yeShear:
I-viscosity yezisombululo ze-HPMC ixhomekeke kakhulu kwireyithi yokucheba, kunye namazinga aphezulu okucheba akhokelela kwi-viscosity ephantsi ngenxa yokulungelelaniswa kunye nokwelulwa kwamakhonkco e-polymer.
Oku kuxhomekeka kwesantya sokucheba ngokuqhelekileyo kuchazwa ngumthetho-mthetho okanye imodeli ye-Herschel-Bulkley, enxulumanisa uxinzelelo lokucheba kunye nesantya sokucheba kunye noxinzelelo lwesivuno.
Ukuqonda ukuxhomekeka kwesantya sokucheba kubalulekile ekuqikeleleni nasekulawuleni indlela yokuhamba kweenkqubo zeHPMC ezityebileyo kwizicelo ezibonakalayo.
6. Iziphumo zoxinaniso:
Ukwandisa ukuxinana kwe-HPMC kwisisombululo kukhokelela ekwandeni kwe-viscosity kunye noxinzelelo lwesivuno.Le mpembelelo yogxininiso ibalulekile ekufezekiseni ukuhambelana okufunwayo kunye nokusebenza kwizicelo ezahlukeneyo.
Nangona kunjalo, kwiindawo eziphezulu kakhulu, izisombululo ze-HPMC zinokubonisa ukuziphatha okufana nejeli, ukwenza isakhiwo senethiwekhi esonyusa kakhulu i-viscosity kunye noxinzelelo lwesivuno.
7. Ukuxuba kunye nokusasazwa:
Ukuxubana ngokufanelekileyo kunye nokusasazwa kwe-HPMC kwisisombululo kubalulekile ekufezekiseni i-viscosity efanayo kunye neempawu ze-rheological kuyo yonke inkqubo.
Ukusasazwa okungaphelelanga okanye agglomeration amasuntswana HPMC kunokukhokelela viscosity non-uniform kunye nokusebenza esichengeni kwizicelo ezifana neengubo kunye nokuncamathelisa.
Iindlela ezahlukeneyo zokuxuba kunye nezongezo zinokuqeshwa ukuqinisekisa ukusasazwa kunye nokusebenza kweenkqubo zokujiya zeHPMC.
Iipropathi zerheological zeenkqubo ze-HPMC ezityebileyo, kubandakanya i-viscosity, i-thixotropy, uxinzelelo lwesivuno, ubuntununtunu bobushushu, ukuxhomekeka kwesantya sokucheba, iziphumo zoxinaniso, kunye nokuziphatha kokuxuba/ukusasazeka, zidlala indima ebalulekileyo ekumiseleni ukusebenza kwazo kwizicelo ezahlukeneyo.Ukuqonda kunye nokulawula ezi mpawu zibalulekile ekuqulunqeni iimveliso ezisekelwe kwi-HPMC kunye nokuqina okufunekayo, ukuzinza, kunye nokusebenza.
Ixesha lokuposa: May-08-2024