Latex agba bụ ngwakọta nke pigmenti, filler dispersions na polymer dispersions, na mgbakwunye ga-eji dozie ya viscosity nke mere na o nwere rheological Njirimara chọrọ maka onye ọ bụla ogbo nke mmepụta, nchekwa na ewu.A na-akpọkarị ihe mgbakwunye dị otú ahụ thickeners, nke nwere ike ime ka viscosity nke mkpuchi dịkwuo mma ma melite rheological Njirimara nke mkpuchi, n'ihi ya, a na-akpọkwa ha rheological thickeners.
Ihe ndị a na-ewebata naanị njirimara ndị a na-ejikarị cellulose thickeners na ngwa ha na agba latex.
Ihe ndị dị na cellulosic nwere ike itinye na mkpuchi gụnyere methyl cellulose, hydroxyethyl cellulose, na hydroxypropyl methyl cellulose.Ihe kachasị mma nke cellulose thickener bụ na mmetụta na-eme ka ọkpụkpụ dị ịrịba ama, ọ pụkwara inye agba ahụ ka ọ bụrụ ihe na-ejide mmiri, nke nwere ike igbu oge ihicha nke agba ruo n'ókè ụfọdụ, ma mee ka agba ahụ nwee ụfọdụ thixotropy, na-egbochi agba si ihicha.Mmiri ozuzo na stratification n'oge nchekwa Otú ọ dị, ndị dị otú ahụ thickeners nwekwara mwepu nke ogbenye larịị nke agba, karịsịa mgbe eji elu-viscosity akara ule.
Cellulose bụ ihe na-edozi ahụ maka microorganisms, yabụ ekwesịrị ịgbatị usoro mgbochi mildew mgbe ị na-eji ya.Cellulosic thickeners nwere ike na thickeners mmiri na-adọ, ma ọ dịghị ndim mmetụta na ndị ọzọ mmiri na agba, ma ọ bụ na ha nwere ike ime ka ịrịba mmekọrịta n'etiti pigmenti na emulsion ahụ na agba, n'ihi ya, ha enweghị ike ịgbanwe rheology nke agba. , N'ozuzu, ọ nwere ike ịbawanye viscosity nke mkpuchi na ọnụ ọgụgụ dị ala na nke ọkara (nke a na-akpọkarị KU viscosity).
1. Hydroxyethyl cellulose
Nkọwapụta na ụdị nke ngwaahịa hydroxyethyl cellulose bụ nke a na-ahụkarị dịka ogo nnọchi na viscosity siri dị.Na mgbakwunye na ọdịiche dị na viscosity, ụdị hydroxyethyl cellulose nwere ike kewaa n'ime ụdị solubility nkịtị, ụdị mgbasa ngwa ngwa na ụdị nkwụsi ike nke ndu site na mgbanwe na usoro mmepụta.N'ihe gbasara usoro eji eme ihe, hydroxyethyl cellulose nwere ike ịgbakwunye na ọkwa dị iche iche na usoro mmepụta mkpuchi.Enwere ike ịgbakwunye ụdị ngwa ngwa na-agbasa ngwa ngwa n'ụdị ntụ ntụ akọrọ, ma uru pH nke usoro ahụ tupu ị gbakwunye ya kwesịrị ịbụ ihe na-erughị 7, tumadi n'ihi na hydroxyethyl cellulose na-agbaze nwayọọ nwayọọ na ọnụ ala pH dị ala, na e nwere oge zuru ezu maka. mmiri na-abanye n'ime n'ime akụkụ ahụ, wee mụbaa uru pH iji mee ka ọ gbazee ngwa ngwa.A pụkwara iji usoro ndị kwekọrọ na-edozi ụfọdụ ntinye nke gluu ma tinye ya na usoro agba.
2. Hydroxypropyl Methyl Cellulose
Mmetụta siri ike nke hydroxypropyl methylcellulose bụ n'ụzọ bụ isi dị ka nke hydroxyethylcellulose, ya bụ, ịbawanye viscosity nke mkpuchi na ọnụ ọgụgụ dị ala na nke ọkara.Hydroxypropyl methylcellulose na-eguzogide nbibi nke enzymatic, ma mmiri ya adịghị mma dị ka nke hydroxyethyl cellulose, ọ na-enwekwa ọghọm nke gelling mgbe ọ na-ekpo ọkụ.Maka hydroxypropyl methylcellulose nke a na-agwọ n'elu, enwere ike ịgbakwunye ya na mmiri mgbe ejiri ya, mgbe ọ na-akpali ma gbasaa, tinye ihe ndị dị na alkaline dị ka mmiri amonia, gbanwee pH uru na 8-9, ma kpalie ruo mgbe agbazere kpamkpam.Maka hydroxypropyl methylcellulose na-enweghị ọgwụgwọ elu, enwere ike ịtinye ya ma zaa ya na mmiri ọkụ dị elu karịa 85 Celsius tupu ejiri ya, wee mee ka ọ dị jụụ n'ime ụlọ, wee kpoo ya na mmiri oyi ma ọ bụ mmiri ice iji gbazee ya kpamkpam.
3. Methyl cellulose
Methylcellulose nwere ihe ndị yiri ya na hydroxypropylmethylcellulose, mana ọ naghị akwụsi ike na viscosity na okpomọkụ.
Hydroxyethyl cellulose bụ ihe a na-ejikarị eme ihe na agba latex, a na-ejikwa ya na agba latex dị elu, ọkara na nke dị ala na nnukwu agba agba.N'ọtụtụ ebe na-eji na ndim nke nkịtị latex agba, isi awọ calcium ntụ ntụ latex agba, wdg Nke abụọ bụ hydroxypropyl methylcellulose, nke na-eji na a ụfọdụ ego ruru ka nkwalite nke emepụta.A naghị eji Methyl cellulose eme ihe na agba latex, mana a na-ejikarị ya eme ihe n'ime ntụ ntụ na mgbidi n'èzí n'ihi mgbasa ya ozugbo na ezigbo njide mmiri.methyl cellulose nwere viscosity dị elu nwere ike inye putty na thixotropy pụtara ìhè na njigide mmiri, na-eme ka ọ nwee ezigbo ihe nchacha.
Oge nzipu: Jan-03-2023