Isikhathi sokubeka ukhonkolo yipharamitha ebalulekile ethinta ikhwalithi yokwakha nenqubekela phambili. Uma isikhathi sokusetha side kakhulu, kungaholela ekuqhubekeni kwenqubekela phambili yokwakha futhi kulimaze ikhwalithi eqinile kakhonkolo; Uma isikhathi sokusetha sifushane kakhulu, kungaholela ebunzimeni bokwakha ukhonkolo futhi kuthinte umphumela wokwakha wephrojekthi. Ukuze uguqule isikhathi sokubekwa kokhonkolo, ukusetshenziswa kwamalungelo obuhleliwe sekuyindlela ejwayelekile ekukhiqizweni kokhonkolo kwanamuhla.I-Hydroxyyethyl methyl cellulose (hemc), njenge-cellulose eguquliwe eguquliwe eguquliwe, isetshenziswa kabanzi kuma-admixtures ukhonkolo futhi ingathinta i-Rheology, ukugcinwa kwamanzi, ukusetha isikhathi nezinye izakhiwo zikakhonkolo.1. Izici eziyisisekelo ze-hemc
I-HEMC iyi-cellulose eguquliwe, evame ukwenziwa kusuka ku-cellulose yemvelo ngokuphendula nge-tezotion kanye ne-methylation. Ine-solubility enhle yamanzi, ukuqina, ukugcinwa kwamanzi kanye nezakhiwo ze-gelling, ngakho-ke kusetshenziswa kabanzi ekwakheni, ukumboza, amakhemikhali nsuku kanye nezinye izinkambu. Ngokhonkolo, i-hemc ivame ukusetshenziswa njenge-swerener, i-ejenti yokulawula amanzi kanye ne-ejenti yokulawula i-heleology, engathuthukisa ukusebenziseka kokhonkolo, ukukhulisa ukunamathela kanye nesikhathi sokwengeza isikhathi.
2. Umphumela we-hemc ngesikhathi sokusetha ukhonkolo
Ukubambezela ukusetha isikhathi
Njenge-cellulose derivative, i-hemc iqukethe inani elikhulu lamaqembu ama-hydrophilic esakhiweni samangqamuzana, esingasebenzisana nama-molecule wamanzi ukwakha i-hydrate ezinzile, ngaleyo ndlela kubambezele inqubo yokwehla kwe-hydrate ngezinga elithile. I-hydration reaction of usimende iyindlela eyinhloko yokuqina kokhonkolo, futhi ukungezwa kwe-hemc kungathinta isikhathi sokubeka ngalezi zindlela ezilandelayo:
Ukugcinwa kwamanzi okuthuthukisiwe: I-hemc ingathuthukisa kakhulu ukugcinwa kwamanzi ngokhonkolo, yehlise kancane izinga lokuhwamuka kwamanzi, futhi yandisa isikhathi sokuphendula kwe-hycration. Ngokugcinwa kwamanzi, i-hemc ingakugwema ukulahlekelwa ngokweqile kwamanzi, ngaleyo ndlela kubambezele ukwenzeka kwesilungiselelo sokuqala nesokugcina.
Ukunciphisa ukushisa kwe-hydration: I-hemc ingavimba ukushayisana kanye nokusabela kwe-hydration yezinhlayiya zokwenza usimende ngokwandisa i-viscosite yokhonkolo futhi yehlisa ijubane lokunyakaza lezinhlayiya zensimbi. Isilinganiso esiphansi se-hydration sisiza ukubambezela isikhathi sokubeka ukhonkolo.
Ukulungiswa kwe-Rheological: I-hemc ingashintsha izakhiwo zesimbozo sikakhonkolo, yandise ukubonakala kwayo, futhi inamathisele ukukhonkolo kokhonkolo ekwenzeni okuhle ekuqaleni, ukugwema ubunzima bokwakha okubangelwa ukuphoqelelwa ngokweqile.
Izici Zokuthonya
Umphumela weIpikiliEkubekeni isikhathi akuhlobene kakhulu nomthamo wayo, kepha nangokuthintwa ezinye izinto zangaphandle:
Isisindo samangqamuzana kanye nesilinganiso sokufakwa esikhundleni se-hemc: isisindo samangqamuzana kanye nezinga lokufaka esikhundleni (izinga lokufaka esikhundleni se-ethyl ne-methyl) se-hemc linethonya elikhulu ekusebenzeni kwalo. I-hemc enesisindo esiphakeme samangqamuzana kanye nezinga eliphakeme lokufakwa esikhundleni kwesinye isikhathi livame ukwakha isakhiwo senethiwekhi esinamandla, okubonisa ukugcinwa kwamanzi okungcono, ukuqina kwezindawo, ngakho-ke umphumela wokubambezeleka wokusetha ubaluleke kakhulu.
Uhlobo lukasimende: Izinhlobo ezahlukene zikasimende zinamazinga ahlukile we-hydration, ngakho-ke umphumela we-hemc ezinhlelweni ezihlukile usimende uhlukile. Usimende ojwayelekile wePortland usimende unesilinganiso esisheshayo se-hydration, kanti amanye amasentimitha aphansi noma usimende okhethekile enamazinga we-hydration kancane, futhi iqhaza le-hemc kulezi zinhlelo kungenzeka livelele ngokwengeziwe.
Izimo zezemvelo: Izimo zezemvelo ezinjengokushisa kanye nomswakama zinethonya elibalulekile ngesikhathi sokusetha ukhonkolo. Amazinga okushisa aphezulu azosheshisa ukusabela kwe-hydration of usimende, okuholela ngesikhathi esifushane sokusetha, futhi umphumela we-hemc ezindaweni eziphakeme zokushisa angahle abekwe amandla. Ngokuphambene nalokho, ezindaweni eziphansi zokushisa, umphumela wokulibala we-hemc ungabonakala ngokwengeziwe.
Ukuhlushwa kwe-hemc: Ukuhlushwa kwe-hemc kunquma ngqo izinga lethonya lawo ngokhonkolo. Ukugxila okuphezulu kwe-hemc kungakhuphula kakhulu ukugcinwa kwamanzi kanye ne-rheology kakhonkolo, ngaleyo ndlela kubambezele ngempumelelo isikhathi sokusetha, kepha i-hemc eyeqile ingadala ukufutheka kokhonkolo futhi kuthinte ukusebenza kokhonkolo.
Umphumela we-Synergistic we-hemc nezinye ama-admixtures
I-HEMC ivame ukusetshenziswa nezinye ama-admixtures (njengama-surcucers amanzi, ama-retaarders, njll.) Ukulungisa kahle ukusebenza kokhonkolo. Ngokubambisana kwabathengi, umphumela wokulibazisa we-hemc ungathuthukiswa futhi. Isibonelo, umphumela we-synergistic wabathengi abathile njenge-phosphase kanye nama-admixtures kashukela nge-hemc kunganwebeka kakhulu isikhathi sokhonkolo, esilungele amaphrojekthi akhethekile ezimotweni ezishisayo noma ezidinga isikhathi eside sokwakha.
3. Eminye imiphumela ye-hemc ekwakhiweni kokhonkolo
Ngaphezu kokubambezela isikhathi sokusetha, i-hemc nayo inomphumela obalulekile kwezinye izakhiwo zikakhonkolo. Isibonelo, i-hemc ingathuthukisa uketshezi, i-anti-inqurgal, ukusebenza ngokuqina nokuqina kokhonkolo. Ngenkathi ulungisa isikhathi sokusetha, imiphumela yokuqina nokugcina amanzi ye-hemc ingavimba ngempumelelo ukuhlukaniswa noma ukopha kokhonkolo, futhi kuthuthukiswe ikhwalithi ephelele kanye nokuqina kokhonkolo.
I-HydroxyYethyl Methylcellulose (Hemc) ingabambezela ngempumelelo isikhathi sokusetha ngokhonkolo ngokugcinwa kwayo okuhle, ukuqina kanye nemiphumela yemigomo yomlomo. Izinga lethonya le-hemc lithintwa yizinto ezinjengesisindo salo molecular, degree of subiniotion, uhlobo lwesimende, inhlanganisela yokuhlanganiswa kanye nezimo zemvelo. Ngokulawula kahle umthamo kanye nesilinganiso se-hemc, isikhathi sokusetha singanwetshwa ngempumelelo ngenkathi kuqinisekisa ukusebenza kokhonkolo, kanye nokuqina kokhonkolo kungathuthukiswa. Kodwa-ke, ukusetshenziswa ngokweqile kwe-hemc kungaletha nemiphumela emibi, njengotshani obungebuhle noma i-hydration engaphelele, ngakho-ke idinga ukusetshenziselwa ukuqashelwa kwezidingo zangempela zobunjiniyela.
Isikhathi sePosi: Nov-21-2024