Hydroxypropyl methylcelculose (hpmc)Ngaba i-polymer ye-polymer ye-polymer esetyenziswa ngokubanzi isetyenziswa ekwakhiweni, amayeza, ukutya kunye nemizi-mveliso yekhemikhali. Yinto engu-Ionic se-ionsulose ether efunyenwe ngokutshintsha kweekhemikhali kweselutase yendalo, enesisu esihle, ukwenziwa, ukuzinza kwezemiziselo. Nangona kunjalo, phantsi kweemeko zobushushu obuphezulu, i-HPMC iya kuphazamisa ukonakaliswa kwe-thermerm, enefuthe elibalulekileyo kuzinzo kunye nokusebenza kwazo kwizicelo ezisebenzayo.
Inkqubo yokuphelisa i-HPMC
Ukonakaliswa kwe-shirm ye-HPMC ikakhulu kubandakanya utshintsho lomzimba kunye notshintsho lwemichiza. Utshintsho lomzimba lubonakaliswa njengokuvela kwamanzi, inguqu yeglasi kunye nokuncitshiswa kwe-viscofity, ngelixa utshintsho lwe-viscofity lubandakanya ukutshatyalaliswa kwesakhiwo semolekyuli, ukucoca isebe leqela.
I-1. Inqanaba lobushushu eliphantsi (i-100-200 ° C): Ukuphuma kwamanzi kunye nokuhombisa kokuqala
Ngaphantsi kweemeko zobushushu ezisezantsi (malunga ne-100 c), i-HPMC ikakhulu iphantsi kwe-Evaporation yamanzi kunye notshintsho lweglasi. Kuba i-HPMC iqulethe inani elithile lamanzi adityanisiweyo, la manzi aya kutsho kancinci ngexesha lokufudumeza, ngaloo ndlela echaphazela iipropathi zayo. Ukongeza, i-vickosity ye-HPMC iya kuncipha nokwanda kobushushu. Utshintsho okweli nqanaba ikakhulu lutshintsho kwiipropathi zomzimba, ngelixa isakhiwo sekhemikhali esihlala singaguqukanga.
Xa amaqondo obushushu eqhubeka enyuka aye kwi-150-200 ° C, i-HPMC iqala ukuya kwi-Reolodary Remodion. Ibonakala ikakhulu ekususweni kwe-hydroxylpropy ye-hydropyl kunye namaqela enkqubo yendlela, okukhokelela ekunciphiseni ubunzima bemolekyuli kunye notshintsho lolwakhiwo. Okwangoku, i-HPMC inokuvelisa inani elincinci leemolekyuli ezincinci, ezinje nge-methanol kunye ne-propiyaldehyhhyde.
I-2. Inqanaba lobushushu eliphakathi (200-300 ° C): Ukonakaliswa kwe-chain ye-chain kunye nemolekyuli encinci
Xa iqondo lobushushu liye landa kwi-200 ukuya kwi-500 ° C, inqanaba lezinto zokulahla le-HPMC likhawulezile kakhulu. Eyona ndlela iphambili yokonakaliswa ibandakanya:
I-Ether Book Windoge: I-chain ephambili ye-HPMC iqhagamshelwe ziiyunithi ze-Glucose, kwaye i-bind ye-ether kuyo ngokuthe ngcembe yaphuka phantsi kobushushu obuphakathi, ibangela i-polymer thein ibolekele.
Ukupheliswa kwempahla emfutshane: Isakhiwo sefowuni ye-HPMC sinokwenza into yokupheliswa ngamathambo-subsaration kwiqondo lokushisa esiphezulu ukwenza into ephakathi, ethabatheka ngakumbi kwiimveliso eziguqukayo.
Ukukhutshwa kwee-volales ezincinci zemolekyuli: Ngeli nqanaba, i-HPMC ikhuphe i-CO, Co₂, i-H₂O kunye nemolekyuli encinci, njengeFomaldehyde, Acetaldehyde kunye ne-Acroleyde kunye ne-ACROLDE.
Olu tshintsho luya kubangela ubunzima be-phummc ukuyeka kakhulu, i-viscosity ihle kakhulu, kwaye loo nto iya kuqala ukujika ityheli kwaye ivelise i-conking.
3. Inqanaba lobushushu eliphakamileyo (300-500 ° C): I-carbonization kunye nokuhamba
Xa iqondo lobushushu liphuma ngaphezulu kwe-300 ° C, i-HPMC ingena kwinqanaba lokuphelisa elinogonyamelo. Ngeli xesha, ukwahlukana ngakumbi kwekhonkco eliphambili kunye nokuzibongoza kweemolethi ezincinci kukhokelela kwintshabalalo epheleleyo yezinto ezibonakalayo, kwaye ekugqibeleni zenza intsalela ye-carbonaceous (coke). Ezi zinto zilandelayo zenzeka ngoku:
Ukonakaliswa kwe-oxidave: kubushushu obuphezulu, i-HPMC iphantsi kwempendulo ye-oxidation ukuvelisa i-co₂ kunye ne-CO, kwaye kwangaxeshanye i-prosausies yentsalela.
Ukuphendula okwenzayo: Inxalenye yesakhiwo sePolymer iguqulwa ibe yimveliso engaphelelanga, enjengekharbon emnyama okanye i-Coke i-Coke.
Iimveliso eziguquguqukayo: Qhubeka nokukhupha i-hydrocarbles ezinje nge-ethylene, proplenene, kunye ne-methane.
Xa ifudumele emoyeni, i-HPMC inokutshisa ngakumbi, ngelixa ishushu ngokungabikho kwioksijini ikakhulu iyintsalela yekhabhoni.
Izinto ezichaphazela ukonakaliswa kwe-HPMC
Ukonakaliswa kwe-HPMC kuyachaphazeleka ngezinto ezininzi, kubandakanya:
Isakhiwo sekhemikhali: inqanaba lokufakwa endaweni ye-hydroxypropy kunye namaqela e-AFGISY kwi-HPMC ichaphazela uzinzo lwe-therm. Ngokubanzi, i-HPMC enenqanaba eliphezulu le-hydroxypropy inozinzo olungcono lobuqhetseba.
Imozulu yomhlaba, emoyeni, i-HPMC ixhonyiselwa ekungcoleni kwe-oxidative, ngelixa ikwimeko yerhasi yerhasi (njenge-nitrogen), iqondo lokonakalisa i-thermal lihamba kancinci.
Iqondo lokufudumeza: Ukufudumeza ngokukhawuleza kuya kukhokelela ekunciphiseni ngokukhawuleza, ngelixa ukufudumeza kunokunceda i-HPMC ukuba ikhawuleze kwaye inciphise imveliso yeemveliso zegesi.
Umxholo wokufuma: I-HPMC inenani elithile lamanzi adityanisiweyo. Ngexesha lenkqubo yokufudumeza, ukuvela komswakama kuya kuchaphazela ubushushu be-glass yeglasi yeglasi kunye nenkqubo yokonakaliswa.
Impembelelo yesicelo esisebenzayo sokupheliswa kwe-HPMC
Iimpawu zokonakalisa i-HPMC zibaluleke kakhulu kwicandelo layo lesicelo. Umzekelo:
Ishishini lokwakha: I-HPMC isetyenziswa kwizimo zesamente i-cender kunye neemveliso ze-gypsim, kunye nokuzinza kwazo ngexesha lokwakhiwa kobushushu kufuneka kuthathelwe ingqalelo ukuphepha ukonakaliswa kokusebenza okuchaphazela ukusebenza kweqondo lokungasebenzi.
Ishishini lamayeza: I-HPMC yiarhente yokukhutshwa kwechiza, kwaye i-deoation kufuneka ithintelwe ngexesha lokuvelisa ubushushu ukuqinisekisa uzinzo lwechiza.
Ishishini lokutya: I-HPMC yindawo yokutya, kwaye iimpawu zayo zokonakaliswa kwe-thermal zichaza inkqubo yokuqhutywa kweqondo lokushisa kunye nokulungiswa.
Inkqubo yokuphelisa i-thermal yeI-HPMCInokwahlulwa ibe yindawo yokuphuma kwamanzi kunye nokupheliswa kokuqala kwinqanaba lobushushu eliphantsi, iCoin Cleavical Consuvilic kunye neMulucculis encinci kwinqanaba lobushushu, kunye ne-carbonization kunye nokuhamba kwinqanaba lobushushu. Uzinzo lwayo lwe-thermal luchaphazeleka zizinto ezinjengesimo semichiza, imeko-bume, inqanaba lokufudumeza kunye nomswakama. Ukuqonda indlela yokuphelisa i-HPMC yexabiso elikhulu lokuphucula isicelo kwalo kunye nokuphucula uzinzo lwezinto ezibonakalayo.
Ixesha lokuphumla: Mar-21 ukuya kwi-4025