I-Cellulose iyi-polysaccharide eyakha izimpaphe zempi ezinhlobonhlobo zamanzi. Ama-cellulose mkhulu ama-polymers ancibilikayo ancibilikayo. Umlando wawo wokusebenzisa isikhathi eside, ngaphezu kweminyaka engama-30, futhi kunezinhlobo eziningi. Basasetshenziswa cishe cishe kuwo wonke amapende ama-latex futhi bangama-moveram abakhulu. Ama-celluliosic omkhulu asebenza kahle kakhulu ezinhlelweni zamashele ngoba zikhula amanzi uqobo. Embonini yokupenda, abakhulu abasetshenziswa kakhulu yi-cellulose yile:I-methyl cellulose (MC), I-Hydroxyyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (ehec), i-hydroxypropylllose (HPC),I-Hydroxypropyl methyl cellulose (HPMC)kanye ne-hydropobily hydroxyethyl cellulose (HMBHEC). I-HEC yi-polysaccharide esetshenziswa ngamanzi kabanzi esetshenziswa kakhulu ekuqondeni kwamapende we-tandx ne-semi-grass ye-latex. Ama-Fireners atholakala kumabanga okubona ahlukile kanye nama-cellulose anokuhambisana okuhle kombala nokuqina kwesitoreji.
Izinga lokulinganisa, i-anti-splash, izakhiwo ezakhiwe ngefilimu nezolwa zokulwa nefilimu yokuhlanganisa zincike esimeni se-molecular esihlobeneI-HEC. I-HEC namanye ama-polymers angenayo angenayo ahlanganisiwe aqina isigaba samanzi se-coating. Ama-cellulose amikhulu angasetshenziswa yedwa noma ahlanganiswe nabanye abakhulu ukuthola i-rheology ekhethekile. I-Cellulose Afers ingaba nezinsimbi ezihlukile ze-molecular kanye namamaki okufanekisa, aqhamuka esisindo esiphansi samamayela 2% i-viscoty enobuhlakani obuyi-10 mp s kuya ku-viscoty ephezulu ye-molecular yesisindo se-100 000 MP S. Amamaki wesisindo aphansi avame ukusetshenziswa njengama-colloids avikelayo e-Latex Paint emulmerization, kanye namabanga asetshenziswa kakhulu (i-viscosity 4 800-50 000 mp · s) asetshenziswa njengabakhulu. Indlela yalolu hlobo lwe-smilener ingenxa ye-hydration ephezulu yama-hydrogen bond kanye nokufakwa phakathi kwamaketanga ama-molecular.
I-cellulose yendabuko i-polymer ephezulu ye-molecular ikhula ikakhulukazi ngokusebenzisa amaketanga ama-molefanel. Ngenxa yokuvunywa okuphezulu ngezinga eliphansi le-shear, impahla ekwandisayo ayimpofu, futhi ithinta i-gloss of the film ye-coating. Ngezinga eliphakeme kakhulu, i-viscosity iphansi, ukumelana okuchithekile kwefilimu yokuhlanganisa kumpofu, futhi ukugcwala kwefilimu yokuhlanganisa akukuhle. Izici zohlelo lokusebenza lwe-HEC, njengokuvimbela ukuxubha, ukuqopha kanye nokugibela i-roller, zihlobene ngokuqondile nokukhethwa komkhulu. Futhi izakhiwo zayo zokugeleza ezinjengezinga lokulinganisa nokulinganisa kwalokhu zithinteka kakhulu ngabakhulu.
I-Hydrophobically Moshified cellulose (HMHEC) yi-cellulose nyouner enokuguqulwa kwe-hydrophobic ngamanye amaketanga afakwe ama-alky (amaqembu amade we-alkyl amade ekhasini eliphakeme lesakhiwo). Le nhlanganisela inokubona okuphezulu ezindaweni eziphakeme ze-shear futhi ngenxa yalokho ukwakheka kwefilimu okungcono. Njenge-natrosol plus grade 330, 331, celosize SG-100, Bermocoll EHM-100. Umphumela wayo wokuqina uqhathaniswa nalokho kwe-cellulose ether cregeters enesisindo esikhulu se-molecular molecular. Kuthuthukisa ukubonakala nokusezingeni le-ICI, futhi kunciphisa ukungezwani komhlaba. Isibonelo, ukungezwani kwe-HEC kucishe kube ngu-67 MN / M, kanti ukungezwani kwe-HMBEC kungu-55 ~ 65 mN / m.
I-HMBHEC inokufakelwa okuhle kakhulu, ukulwa nama-sagging, amazinga okulinganisa, isicwebezelisi esihle kanye nokuvuka okulwa nopende. Isetshenziswa kabanzi futhi ayinawo umphumela ongemuhle ekwakhekeni kwamafilimu kwamapende amahle we-latex. Ukusebenza okuhle kwefilimu nokusebenza kokulwa nokulwa nokuwohloka. Lo mfokazi onobudlelwano obuthile usebenza kangcono nezinhlelo ze-vinyl acetate copolymer futhi unezakhiwo ezifanayo nabanye abakhuthazayo, kepha ngokwenza lula ukwakhiwa.
Isikhathi sePosi: APR-25-2024