Mmetụta siri ike nke cellulose ether na-adabere na: ogo nke polymerization nke cellulose ether, ntinye ngwọta, ọnụ ọgụgụ shear, okpomọkụ na ọnọdụ ndị ọzọ.Ngwongwo gelling nke ihe ngwọta bụ ihe pụrụ iche na alkyl cellulose na ihe ndị gbanwetụrụ.Njirimara gelation metụtara ogo ngbanwe, ntinye ngwọta na ihe mgbakwunye.Maka ihe nrụpụta hydroxyalkyl gbanwetụrụ, njirimara gel na-emetụtakwa ogo mgbanwe nke hydroxyalkyl.N'ihi na ala viscosity MC na HPMC, 10% -15% ngwọta nwere ike kwadebere, ọkara viscosity MC na HPMC nwere ike kwadebere 5% -10% ngwọta, na elu viscosity MC na HPMC nwere ike na-akwadebe 2% -3% ngwọta, na-emekarị. A na-etinyekwa nhazi nke viscosity nke cellulose ether na ngwọta 1%-2%.
Ether cellulose dị arọ nke dị elu nwere arụmọrụ dị elu nke ukwuu, na polymers nwere ihe dị arọ dị iche iche nwere viscosities dị iche iche n'otu ngwọta ntinye uche.Enwere ike nweta viscosity ebumnuche naanị site n'ịgbakwụnye nnukwu ether cellulose dị arọ dị ala.Viscosity ya nwere ntakịrị ịdabere na ọnụ ọgụgụ shear, viscosity dị elu na-erute viscosity lekwasịrị anya, na ihe mgbakwunye a chọrọ dị ntakịrị, na viscosity na-adabere na nrụpụta ọrụ.Ya mere, iji nweta otu ihe na-agbanwe agbanwe, a ghaghị ijide n'aka na a ghaghị ijide n'aka na ether cellulose ether (ntụkwasị uche nke ngwọta) na ngwọta viscosity.The gel okpomọkụ nke ngwọta na-ebelata linearly na-abawanye nke ịta nke ihe ngwọta, na gels na ụlọ okpomọkụ mgbe eru a ụfọdụ ịta.The gelling ịta ahụhụ nke HPMC bụ dịtụ elu na ụlọ okpomọkụ.
Enwere ike ịhazi nkwekọ site na ịhọrọ nha nha na ịhọrọ cellulose ethers nwere ogo mgbanwe dị iche iche.Ihe a na-akpọ mgbanwe bụ iwebata ụfọdụ ngbanwe nke otu hydroxyalkyl na nhazi ọkpụkpụ nke MC.Site n'ịgbanwe ụkpụrụ ngbanwe nke ndị nnọchi anya abụọ ahụ, ya bụ, ụkpụrụ nnọchi anya DS na MS nke otu methoxy na hydroxyalky nke anyị na-ekwukarị.Enwere ike nweta ihe dị iche iche chọrọ ịrụ ọrụ nke cellulose ether site n'ịgbanwe ụkpụrụ nnọchi anya nke ihe abụọ a nọchiri anya ya.
Ihe ngwọta dị elu nke cellulose ether aqueous nwere nnukwu thixotropy, nke bụkwa isi njirimara cellulose ether.Aqueous ngwọta nke MC polymers na-enwekarị pseudoplastic na-abụghị thixotropic fluidity n'okpuru ha gel okpomọkụ, ma Newtonian eruba Njirimara na ala shiee ọnụego.Pseudoplasticity na-abawanye site na ịdị arọ molekụla ma ọ bụ itinye uche nke cellulose ether, n'agbanyeghị ụdị nnọchi na ogo nke nnọchi.Ya mere, cellulose ethers nke otu viscosity ọkwa, n'agbanyeghị MC, HPMC, HEMC, ga-mgbe niile na-egosipụta otu rheological Njirimara ma ọ bụrụhaala na ịta na okpomọkụ na-na-na-adịgide adịgide.A na-emepụta gels ihe owuwu mgbe a na-ebuli okpomọkụ elu, na oke thixotropic na-eme.Nnukwu ntinye uche na obere viscosity cellulose ethers na-egosi thixotropy ọbụna n'okpuru gel okpomọkụ.Ngwongwo a bara uru nke ukwuu maka ngbanwe nke larịị na sagging na-ewu ụlọ mgbidi.
Ọ dị mkpa ka a kọwaa ebe a na elu viscosity nke cellulose ether, mma njigide mmiri, ma elu nke viscosity, elu nke ikwu molekụla arọ nke cellulose ether, na kwekọrọ ekwekọ mbelata ya solubility, nke nwere mmetụta ọjọọ. na ngwa agha ịta na ịrụ ọrụ ihe owuwu.Nke dị elu nke viscosity, otú ahụ ka ọ na-apụta ìhè nke ọma mmetụta na ngwa agha ahụ, ma ọ bụghị kpamkpam.Ụfọdụ ọkara na viscosity dị ala, mana cellulose ether gbanwetụrụ nwere arụmọrụ ka mma n'ịkwalite ike nhazi nke ngwa agha mmiri.Site na mmụba nke viscosity, njigide mmiri nke cellulose ether na-akawanye mma.
Oge nzipu: Mar-20-2023