Thickeners maka latex agba ga-enwe ezigbo ndakọrịta na latex polymer ogige, ma ọ bụghị a ga-enwe obere ego nke udidi na mkpuchi ihe nkiri, na irreversible urughuru mkpokọta ga-eme, na-akpata mbelata viscosity na coarser urughuru size. Thickers ga-agbanwe ụgwọ nke emulsion. Dịka ọmụmaatụ, cationic thickeners ga-enwe mmetụta na-apụghị ịgbagha agbagha na emulsifiers anionic ma mee ka demulsification. Ezigbo ihe mkpuchi latex ga-enwerịrị ihe ndị a:
1. Obere onunu ogwu na ezigbo viscosity
2. Nkwụsi ike nchekwa dị mma, agaghị ebelata viscosity n'ihi ọrụ nke enzymes, ọ gaghị ebelata viscosity n'ihi mgbanwe na okpomọkụ na pH uru.
3. Njide mmiri dị mma, enweghị ikuku ikuku doro anya
4. Enweghị mmetụta dị n'akụkụ ihe nkiri agba dị ka nkwụsi ike nke scrub, gloss, ike na-ezo na mmiri na-eguzogide
5. Ọ dịghị flocculation nke pigmenti
Nkà na ụzụ na-agbapụta agba nke agba latex bụ ihe dị mkpa iji melite ogo nke latex ma belata ọnụ ahịa. Hydroxyethyl cellulose bụ ezigbo thickener, nke nwere multifunctional mmetụta na ndim, nkwụsi ike na rheological ukpụhọde nke latex agba.
N'ime usoro mmepụta nke agba latex, a na-eji hydroxyethyl cellulose (HEC) mee ihe dị ka onye na-ekesa, onye na-ekpo ọkụ na pigmenti na-ekpuchi ihe iji mee ka viscosity nke ngwaahịa ahụ guzosie ike, belata agglomeration, mee ka ihe nkiri ahụ dị nro ma dị nro, na-eme ka agba latex dịkwuo ogologo. . 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 arụmọrụ dị mma, na agba latex na HEC nwere pseudoplasticity, ya mere brushing, rolling, filling, spraying na ndị ọzọ na-ewu ụzọ nwere uru nke ịzọpụta ọrụ, adịghị mfe ikpochapụ, sag, na obere splashing. HEC nwere ezigbo mmepe agba. Ọ nwere ọmarịcha miscibility maka ọtụtụ agba na ndị na-ekekọta ihe, nke na-eme ka agba latex nwee ọmarịcha agba na nkwụsi ike. Ọdịiche maka ngwa n'ụdị usoro, ọ bụ ether na-abụghị ionic. Ya mere, enwere ike iji ya na oke pH (2 ~ 12), enwere ike ịgwakọta ya na ihe ndị dị na agba latex n'ozuzu dịka pigmenti reactive, ihe mgbakwunye, salts soluble ma ọ bụ electrolytes.
Ọ dịghị mmetụta ọjọọ na mkpuchi ihe nkiri, 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'oge nchekwa ogologo oge, enwere ike ịnọgide na-enwe mgbasa na nkwusioru nke pigmenti, ọ dịghịkwa nsogbu nke na-ese n'elu mmiri na agba. Enwere obere mmiri oyi akwa n'elu agba, na mgbe 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, ihe mkpuchi elu nke agba agba mmiri nwere ike iji HEC.
Ka ọ dị ugbu a, a na-ebubata ihe ndị a na-eji n'ime ụlọ na ihe osise latex dị elu HEC na acrylic polymer (gụnyere polyacrylate, homopolymer ma ọ bụ copolymer emulsion thickeners nke acrylic acid na methacrylic acid) thickeners.
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 10-30mPaS. HEC nke nwere ike iji ruo 300mPa·S ga-enwe mmetụta mgbasawanye ka mma ma ọ bụrụ na ejiri ya na ihe ndị na-emepụta ihe na anionic ma ọ bụ cationic. Usoro ntụaka n'ozuzu bụ 0.05% nke monomer mass.
2. Dị ka thickener
Jiri 15000mPa. Usoro ntụaka nke elu viscosity HEC dị n'elu s bụ 0.5-1% nke ngụkọta nke agba latex, na uru PVC nwere ike iru ihe dịka 60%. Jiri HEC nke ihe dịka 20Pa,s na agba latex, yana ịrụ ọrụ nke agba latex kacha mma. Ọnụ nke iji HEC naanị karịa 30O00Pa.s dị ala. Otú ọ dị, nhazi ọkwa nke agba latex adịghị mma. Site n'echiche nke àgwà chọrọ na mbelata ọnụ ahịa, ọ ka mma iji ọkara na elu viscosity HEC ọnụ.
3. Usoro ngwakọta na agba latex
Enwere ike ịgbakwunye HEC a na-edozi elu na ntụ ntụ ma ọ bụ mpempe akwụkwọ. A na-agbakwunye ntụ ntụ akọrọ ozugbo na ntụ ọka pigmenti. pH na ebe nri kwesịrị ịbụ 7 ma ọ bụ ala. Enwere ike ịgbakwunye ihe ndị na-emepụta alkaline dị ka Yanbian dispersant mgbe mmiri na-ekpochapụ HEC ma gbasaa kpamkpam. Ekwesịrị ịgwakọta slurries mere na HEC n'ime slurry tupu HEC enwee oge zuru ezu iji mee ka mmiri na-ekpo ọkụ ma kwe ka ọ dịkwuo njọ n'ọnọdụ a na-apụghị iji ya mee ihe. Ọ dịkwa ike ịkwadebe HEC pulp na ethylene glycol coalescing agents.
4. Mgbochi ebu nke agba latex
HEC na-agbaze mmiri ga-emebi emebi mgbe ọ na-akpakọrịta na ebu ndị nwere mmetụta pụrụ iche na cellulose na ihe ndị ọzọ. O zughị iji tinye ihe nchekwa na agba naanị, ihe niile mejupụtara ga-abụ enweghị enzyme. Ụgbọ ala mmepụta nke agba latex ga-adị ọcha, yana akụrụngwa niile ga-eji mmiri 0.5% formalin ma ọ bụ O.1% mercury sterilized mgbe niile.
Oge nzipu: Dec-26-2022