The thickener maka latex agba ga-enwe ezi ndakọrịta na emulsion polymer compound, ma ọ bụghị na mkpuchi mkpuchi ga-enwe a obere ego nke reticulate, na ga-emepụta irreversible urughuru agglomeration, nke ga-ebelata viscosity na coarsen urughuru size. The thickener ga-agbanwe ụgwọ nke emulsion. Dịka ọmụmaatụ, cationic thickener ga-enwe mmetụta na-adịghị agbanwe agbanwe na emulsifier anionic iji mebie emulsion. Ezigbo thickener maka agba latex ga-enwerịrị ihe ndị a:
1. Obere onunu ogwu na ezigbo viscosity
2. Nkwụsi ike nchekwa dị mma, enweghị mbelata viscosity n'ihi ọrụ nke enzymes, na enweghị mbelata viscosity n'ihi mgbanwe nke okpomọkụ na uru PH.
3, ezigbo njide mmiri, enweghị ihe ngosi afụ doro anya
4. Enweghị mmetụta ọ bụla na ihe nkiri ihe nkiri dị ka nkwụsi ike nke scrub, gloss, ike na-ezo na mmiri na-eguzogide
5. Ọ dịghị pigmenti flocculation
Nkà na ụzụ na-emepụta ihe nke agba latex bụ ihe dị mkpa iji meziwanye àgwà nke latex ma belata ọnụ ahịa ya. Hydroxyethyl cellulose bụ ezigbo thickener, nke nwere multifunctional mmetụta na ndim, nkwụsi ike na rheological ukpụhọde nke latex agba.
Na usoro mmepụta nke agba latex.hydroxyethyl cellulose (HEC)A na-eji ya dị ka onye na-ekesa, thickener na pigment suspending agent iji mee ka viscosity nke ngwaahịa ahụ guzosie ike, belata agglomeration, mee ka ihe nkiri ahụ dị nro ma dị mma, na-emekwa ka agba latex na-adịgide adịgide. Ezi rheology, nwere ike iguzogide ike ịkwa akwa, ma nwee ike inye ọkwa dị mma, nkwụsi ike na pigmenti. N'otu oge ahụ, HEC nwere ọrụ dị mma nke ọma, na agba latex na HEC nwere pseudoplasticity, ya mere, usoro ihe owuwu dị ka brushing, rolling, filling, na spraying nwere uru nke ịzọpụta ọrụ, ọ dịghị mfe ihicha na sag, na obere splashing. HEC nwere ezigbo mmepe agba. Ọ nwere ọmarịcha miscibility na ọtụtụ ndị na-agba agba na ndị na-ekekọta, na-eme ka o kwe omume ịmepụta eserese latex nwere ezigbo agba na nkwụsi ike. Ntugharị nke etinyere na nhazi ahụ, ọ bụ ether na-abụghị ionic. Ya mere, enwere ike iji ya mee ihe n'ọtụtụ pH (2 ~ 12), ma nwee ike ịgwakọta ya na ihe ndị dị n'ụdị latex n'ozuzu dịka pigmenti reactive, ihe mgbakwunye, salts soluble ma ọ bụ electrolytes.
Enweghị mmetụta ọjọọ na ihe nkiri mkpuchi. N'ihi na HEC aqueous ngwọta nwere doro anya mmiri n'elu esemokwu e ji mara, ọ dịghị mfe ụfụfụ n'oge mmepụta na-ewu, na ọchịchọ nke ugwu mgbawa oghere na pinholes bụ obere.
Ezi nkwụsi ike nchekwa. N'ime usoro nchekwa ogologo oge, enwere ike ịnọgide na-enwe mgbasa na nkwusioru nke pigmenti, ọ dịghịkwa nsogbu nke agba agba na-ese n'elu mmiri. Mgbe enwere obere mmiri oyi akwa n'elu agba na nchekwa nchekwa na-agbanwe nke ukwuu. Viscosity ya ka kwụsiri ike.
HEC nwere ike ịbawanye uru PVC (ụda olu pigmenti) ihe mejupụtara siri ike ruo 50-60%. Tụkwasị na nke ahụ, topcoat thickener nke agba dabeere na mmiri nwekwara ike iji HEC.
Ka ọ dị ugbu a, a na-ebubata ihe ndị a na-eji akwa akwa akwa akwa ụlọ HEC na acrylic polymers (gụnyere polyacrylates, homopolymer ma ọ bụ copolymer emulsion thickeners nke acrylic acid na methacrylic acid).
Enwere ike iji hydroxyethyl cellulose mee ihe
1. Dị ka onye na-ekesa ma ọ bụ gluu nchebe
Na mkpokọta, a na-eji HEC nwere viscosity nke 10 ruo 30 mPaS. Enwere ike iji HEC nke ruru 300mPa·S jikọtara ya na anionic ma ọ bụ cationic surfactants, yana mmetụta mgbasa ozi ka mma. Ọnụ ego ntinye aka bụ 0.05% nke oke monomer.
2, dị ka onye na-agba ume
Jiri 15000mPa. Usoro ntụaka nke elu viscosity HEC dị n'elu s bụ 0.5 ruo 1% nke ngụkọta nke mkpuchi latex, na uru PVC nwere ike iru ihe dịka 60%. Na agba latex, a na-eji HEC nke ihe dịka 20Pa,s eme ihe, na ihe dị iche iche nke agba latex kacha mma. Ọnụ nke iji HEC naanị karịa 30O00Pa.s dị ala. Otú ọ dị, ọkwa ọkwa na njirimara ndị ọzọ nke agba latex adịghị mma. Site n'echiche nke mma chọrọ na mbelata ọnụ ahịa, ọ kacha mma iji ọkara na elu viscosity HEC ọnụ.
3. Usoro ntinye aka na agba latex
Enwere ike ịgbakwunye HEC a na-eme ka ọ dị elu na ntụ ntụ ma ọ bụ ụdị slurry. A na-agbakwunye ntụ ntụ akọrọ na ntụ ọka pigmenti. pH nke ihe mgbakwunye kwesịrị ịbụ 7 ma ọ bụ ala. Enwere ike ịgbakwunye ihe ndị alkaline dị ka ndị na-ekesa ihe mgbe emecharaHECagbawo mmiri wee gbasasịa ya kpamkpam. Ekwesịrị ịgwakọta slurry mere na HEC n'ime slurry tupu HEC enwebeghị oge zuru ezu iji mee ka mmiri na-ekpo ọkụ ma gbasie ike na ọnọdụ a na-apụghị iji ya mee ihe. A pụkwara iji ihe ndị na-ekpokọta glycol dabeere na HEC slurries.
4. Mgbochi mildew nke agba latex
Mmiri mmiri-soluble HEC biodegrades mgbe ekpughere ya na ebu nke kpọmkwem maka cellulose na mmepụta ya. Ịtinye ihe nchekwa na agba naanị ezughi oke, ihe niile mejupụtara ga-abụrịrị enzyme n'efu. Ụgbọ ala ndị a na-emepụta nke agba latex ga-adị ọcha ma dị mma, a ga-ejikwa uzuoku 0.5% formalin ma ọ bụ 0.1% mercury na-ekpochapụ akụrụngwa niile mgbe niile.
Oge nzipu: Eprel-25-2024