Ihe ngosi nke viscosity drop n'oge nchekwa agba bụ nsogbu nkịtị, karịsịa mgbe nchekwa ogologo oge gasịrị, viscosity nke agba na-ebelata nke ukwuu, na-emetụta arụmọrụ ihe owuwu na ngwaahịa ngwaahịa. Mbelata nke viscosity metụtara ọtụtụ ihe, dị ka okpomọkụ, iru mmiri, mgbaze mgbaze, polymer mmebi, wdg, ma mmekọrịta na thickener cellulose ether dị oké egwu.
1. Ọrụ bụ isi nke cellulose ether
Cellulose ether bụ ihe na-esi ísì ụtọ a na-ejikarị eme ihe na agba mmiri. Isi ọrụ ha gụnyere:
Mmetụta siri ike: Cellulose ether nwere ike ịmepụta usoro netwọk akụkụ atọ nke fụrụ akpụ site na ịmịnye mmiri, si otú ahụ na-abawanye viscosity nke usoro ahụ ma melite thixotropy na ịrụ ọrụ nke agba.
Mmetụta nkwusioru nkwusioru: Cellulose ether nwere ike igbochi sedimentation nke ihe siri ike dị ka pigmenti na fillers na agba ma nọgide na-enwe otu agba.
Ihe na-emepụta ihe nkiri: Cellulose ether nwekwara ike imetụta ihe nkiri na-emepụta ihe nkiri nke agba, na-eme ka mkpuchi ahụ nwee ụfọdụ ihe siri ike na ogologo oge.
E nwere ọtụtụ ụdị cellulose ethers, gụnyere methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), wdg Ndị a ihe nwere dị iche iche solubility, ndim ike na nchekwa iguzogide na coatings.
2. Isi ihe kpatara mbelata viscosity
N'oge nchekwa nke mkpuchi, mbelata viscosity bụ isi kpatara ihe ndị a:
(1) Mmebi nke cellulose ethers
Mmetụta siri ike nke cellulose ethers na mkpuchi na-adabere n'ịdị arọ molekụla ha na iguzosi ike n'ezi ihe nke ihe owuwu ha. N'oge nchekwa, ihe ndị dị ka okpomọkụ, acidity na alkalinity, na microorganisms nwere ike ime ka mmebi nke cellulose ethers. Dịka ọmụmaatụ, n'oge nchekwa ogologo oge, ihe ndị acidic ma ọ bụ alkaline dị na mkpuchi ahụ nwere ike ime ka eriri cellulose ether molekụla mee ihe, belata ịdị arọ ya, ma si otú ahụ mee ka mmetụta ya dịkwuo ike, na-eme ka mbelata nke viscosity.
(2) mgbaze volatilite na mmiri njem
Mgbaze mgbaze ma ọ bụ ịkwaga mmiri na mkpuchi nwere ike imetụta ọnọdụ solubility nke cellulose ether. N'oge nchekwa, akụkụ nke mmiri nwere ike ịpụpụ ma ọ bụ ịkwaga n'elu mkpuchi ahụ, na-eme ka nkesa mmiri na mkpuchi na-adịghị mma, si otú ahụ na-emetụta ogo nrịanrịa nke cellulose ether ma mee ka mbelata viscosity na mpaghara mpaghara.
(3) Mwakpo microbial
Uto microbial nwere ike ime na mkpuchi mgbe a na-echekwa ya n'ụzọ na-ekwesịghị ekwesị ma ọ bụ ihe nchekwa na-abaghị uru. Microorganisms nwere ike decompose cellulose ethers na ndị ọzọ organic thickeners, ebelata mmetụta ha ndim na-eme ka viscosity nke mkpuchi ibelata. Ihe mkpuchi mmiri, karịsịa, bụ ebe dị mma maka uto microbial n'ihi na ha nwere nnukwu mmiri.
(4) Oke okpomọkụ ịka nká
N'okpuru ọnọdụ nchekwa dị elu, usoro anụ ahụ ma ọ bụ kemịkalụ nke cellulose ether molecular chain nwere ike ịgbanwe. Dịka ọmụmaatụ, ethers cellulose na-adịkarị mfe oxidation ma ọ bụ pyrolysis na okpomọkụ dị elu, na-eme ka ike gwụ nke mmetụta na-eme ka ọkpụkpụ. Okpomọkụ dị elu na-emekwa ka mgbaze mgbaze na ikpochapụ mmiri dịkwuo ngwa, na-emetụtakwa nkwụsi ike viscosity.
3. Ụzọ iji meziwanye nkwụsi ike nchekwa nke mkpuchi
Iji belata mbelata nke viscosity n'oge nchekwa ma gbasaa ndụ nchekwa nke mkpuchi, enwere ike ịme ihe ndị a:
(1) Ịhọrọ ether cellulose ziri ezi
Ụdị dị iche iche nke cellulose ethers nwere arụmọrụ dị iche iche n'ihe gbasara nkwụsi ike nchekwa. Cellulose ethers nke nwere oke molekụla dị elu n'ozuzu na-enwe mmetụta dị nro ka mma, mana nkwụsi ike nchekwa ha adịghị mma, ebe cellulose ethers nwere obere arọ molecular nwere ike ịrụ ọrụ nchekwa ka mma. Ya mere, mgbe ị na-emepụta usoro ahụ, ekwesịrị ịhọrọ cellulose ethers nwere nkwụsi ike nchekwa dị mma, ma ọ bụ ethers cellulose ga-ejikọta ya na ihe ndị ọzọ na-ekpo ọkụ iji meziwanye nkwụsị nchekwa ha.
(2) Jikwaa pH nke mkpuchi
Acidity na alkalinity nke usoro mkpuchi nwere mmetụta dị mkpa na nkwụsi ike nke cellulose ethers. N'ime nhazi nhazi, a ghaghị ịchịkwa uru pH nke mkpuchi ahụ iji zere oke acidic ma ọ bụ alkaline gburugburu iji belata mmebi nke cellulose ethers. N'otu oge ahụ, ịgbakwụnye ihe kwesịrị ekwesị nke pH adjuster ma ọ bụ ihe nchekwa nwere ike inye aka mee ka pH nke sistemu kwụsie ike.
(3) Mụbaa iji ihe nchekwa eme ihe
Iji gbochie mmebi microbial, a ga-agbakwunye ihe nchekwa kwesịrị ekwesị na mkpuchi ahụ. Ihe nchekwa nwere ike igbochi uto nke microorganisms, si otú a na-egbochi ihe ndị na-emepụta ihe ndị dị ka cellulose ether na-emebi ma na-ejigide nkwụsi ike nke mkpuchi. Ekwesịrị ịhọrọ ihe nchekwa kwesịrị ekwesị dị ka ihe mkpuchi mkpuchi na gburugburu ebe nchekwa si dị, a ga-enyochakwa ịdị irè ha mgbe niile.
(4) Jikwaa ebe nchekwa
Ọnọdụ nchekwa nchekwa na iru mmiri nke mkpuchi nwere mmetụta kpọmkwem na nkwụsi ike viscosity. Ekwesịrị ịchekwa mkpuchi ahụ na ebe akọrọ ma dị jụụ, na-ezere oke okpomọkụ na ọnọdụ iru mmiri dị elu iji belata mgbaze mgbaze na mmebi ether cellulose. Tụkwasị na nke ahụ, nkwakọ ngwaahịa nke ọma nwere ike belata mbugharị na evaporation nke mmiri na-egbu oge na-ebelata mbelata nke viscosity.
4. Ihe ndị ọzọ na-emetụta viscosity
Na mgbakwunye na cellulose ethers, ihe ndị ọzọ dị na usoro mkpuchi ahụ nwekwara ike imetụta mgbanwe nke viscosity. Dịka ọmụmaatụ, ụdị na ịta ahụhụ nke pigmenti, ọnụego mgbanwe nke ihe mgbaze, na ndakọrịta nke ndị ọzọ ma ọ bụ ndị na-ekesa nwere ike imetụta nkwụsi ike viscosity nke mkpuchi. Ya mere, n'ozuzu imewe nke mkpuchi usoro na mmekọrịta dị n'etiti components bụkwa isi ihe dị mkpa ka a ṅaa ntị.
Mbelata nke viscosity n'oge nchekwa nke mkpuchi nwere njikọ chiri anya na ihe ndị dị ka mmebi nke cellulose ethers, mgbaze mgbaze, na ịkwaga mmiri. Iji mee ka nkwụsi ike nchekwa nke mkpuchi ahụ dịkwuo mma, a ga-ahọrọ ụdị cellulose ether kwesịrị ekwesị, pH nke mkpuchi ahụ kwesịrị ịchịkwa, a ga-eme ka ihe mgbochi corrosion sie ike, na ebe nchekwa nchekwa kwesịrị ekwesị. Site n'ichepụta usoro ezi uche dị na ya na njikwa nchekwa dị mma, nsogbu nke viscosity na-ebelata n'oge nchekwa nke mkpuchi nwere ike ibelata nke ọma, a pụkwara imeziwanye arụmọrụ ngwaahịa na asọmpi ahịa.
Oge nzipu: Sep-27-2024