I-thickener yepeyinti ye-latex kufuneka ihambelane kakuhle kunye ne-emulsion polymer compound, ngaphandle koko ifilimu yokugqoka iya kuba nexabiso elincinci le-reticulate, kwaye iya kuvelisa i-particle agglomeration engenakuguquleka, eya kunciphisa i-viscosity kwaye idibanise ubungakanani be-particle size. I-thickener iya kutshintsha umrhumo we-emulsion. Ngokomzekelo, i-cationic thickener iya kuba nefuthe elingenakuguqulwa kwi-anionic emulsifier ukuphula i-emulsion. Eyona nto ifanelekileyo yokujiya yepeyinti yelatex kufuneka ibeneempawu ezilandelayo:
1. Idosi ephantsi kunye ne-viscosity enhle
2. Uzinzo oluhle lokugcina, akukho kunciphisa i-viscosity ngenxa yesenzo se-enzymes, kwaye akukho kunciphisa i-viscosity ngenxa yokutshintsha kweqondo lokushisa kunye nexabiso le-PH.
I-3, ukugcinwa kakuhle kwamanzi, akukho nto icacileyo ye-bubble
4. Akukho miphumo emibi kwiipropati zefilimu ezifana nokuchasana nokukhuhla, i-gloss, amandla okufihla kunye nokumelana kwamanzi
5. Akukho pigment flocculation
Itekhnoloji yokuqina kwepeyinti ye-latex ngumlinganiselo obalulekileyo wokuphucula umgangatho we-latex kunye nokunciphisa iindleko. I-Hydroxyethyl cellulose yinto efanelekileyo yokutyebisa, enemiphumo emininzi kwi-thickening, ukuzinza kunye nokulungiswa kwe-rheological yepeyinti ye-latex.
Kwinkqubo yokuvelisa ipeyinti yelatex,i-hydroxyethyl cellulose (HEC)isetyenziswa njenge-dispersant, thickener kunye ne-pigment suspending agent ukuzinzisa i-viscosity yemveliso, ukunciphisa i-agglomeration, yenza ifilimu yepeyinti igudiswe kwaye igudiswe, kwaye yenza ipeyinti ye-latex yomelele ngakumbi. I-rheology elungileyo, inokumelana namandla aphezulu okucheba, kwaye inokubonelela ngomgangatho olungileyo, ukumelana nokukrweleka kunye nokufana kwe-pigment. Kwangaxeshanye, iHEC inomsebenzi oncomekayo, kwaye ipeyinti yelatex ejiyileyo ngeHEC ine-pseudoplasticity, ngoko ke iindlela zokwakha ezifana nokuxubha, ukuqengqeleka, ukuzalisa, kunye nokutshiza zineengenelo zokonga umsebenzi, akukho lula ukucoca kunye ne-sag, kunye nokutshiza okuncinci. I-HEC inophuhliso oluhle lombala. Inokudityaniswa okugqwesileyo kwemibala emininzi kunye nezibophelelo, okwenza kube lula ukwenza iipeyinti zelatex ezinombala obalaseleyo kunye nozinzo. I-versatility esetyenziswe ekuqulunqweni, i-ether engeyiyo ionic. Ke ngoko, inokusetyenziswa kuluhlu olubanzi lwe-pH (2 ~ 12), kwaye inokuxutywa kunye namacandelo epeyinti ye-latex ngokubanzi njenge-pigment esebenzayo, izongezo, iityuwa ezinyibilikayo okanye i-electrolytes.
Akukho mpembelelo embi kwifilimu yokugqoka. Ngenxa yokuba isisombululo samanzi se-HEC sineempawu ezicacileyo zokuxinana kwamanzi, akukho lula ukukhupha amagwebu ngexesha lemveliso kunye nokwakhiwa, kwaye ukuthambekela kwemingxuma yentaba-mlilo kunye neepinhole kuncinci.
Uzinzo oluhle lokugcina. Kwinkqubo yokugcina ixesha elide, i-dispersibility kunye nokumiswa kwe-pigment kunokugcinwa, kwaye akukho ngxaki yombala ojikelezayo kunye nokuqhakaza. Xa kukho umaleko omncinci wamanzi kwindawo yepeyinti kunye nobushushu bokugcina buguquka kakhulu. I-viscosity yayo isazinzile.
I-HEC inokunyusa ixabiso le-PVC (i-pigment volume concentration) ukubunjwa okuqinileyo ukuya kwi-50-60%. Ukongeza, i-topcoat thickener yepeyinti esekwe emanzini inokusebenzisa i-HEC.
Okwangoku, ii-thickeners ezisetyenziswa kwiipeyinti ze-latex zasekhaya ezikumgangatho ophezulu zingeniswa ngaphandle kwe-HEC kunye neepolima ze-acrylic (kubandakanywa i-polyacrylates, i-homopolymer okanye i-copolymer emulsion thickeners ye-acrylic acid kunye ne-methacrylic acid) i-thickeners.
Iselulosi yeHydroxyethyl ingasetyenziselwa
1. Njenge-dispersant okanye iglue ekhuselayo
Ngokuqhelekileyo, i-HEC ene-viscosity ye-10 ukuya kwi-30 mPaS isetyenziswa. I-HEC ukuya kuthi ga kwi-300mPa·S ingasetyenziswa ngokudityaniswa ne-anionic okanye i-cationic surfactants, kwaye i-dispersion effect ingcono. Isixa sereferensi ngokuqhelekileyo yi-0.05% yobunzima be-monomer.
2, njenge-thickener
Sebenzisa i-15000mPa. I-reference dosage ye-high-viscosity HEC ngaphezu kwe-s yi-0.5 ukuya kwi-1% yobunzima obupheleleyo be-latex yokugqoka, kwaye ixabiso le-PVC linokufikelela malunga ne-60%. Kwipeyinti ye-latex, i-HEC emalunga ne-20Pa,s isetyenziswa, kunye neempawu ezahlukeneyo zepeyinti ye-latex zezona zibalaseleyo. Iindleko zokusebenzisa i-HEC ngaphezulu kwe-30O00Pa.s zisezantsi. Nangona kunjalo, ukulinganisa kunye nezinye iimpawu zepeyinti ye-latex azilungile. Ukususela kumbono weemfuno zomgangatho kunye nokunciphisa iindleko, kungcono ukusebenzisa i-HEC ephakathi kunye nephezulu ye-viscosity kunye.
3. Indlela yokufakwa kwipeyinti yelatex
I-HEC ephathwe ngomphezulu inokongezwa kwifom eyomileyo okanye i-slurry form. Ipowder eyomileyo yongezwa ngokuthe ngqo kwi-pigment yokugaya. I-pH yendawo yokudibanisa kufuneka ibe yi-7 okanye ngaphantsi. Amacandelo e-alkaline anjengama-dispersants anokongezwa emva kokubaI-HECumanziswe kwaye usasazwe ngokupheleleyo. I-Slurry eyenziwe nge-HEC kufuneka idibaniswe kwi-slurry ngaphambi kokuba i-HEC ibe nexesha elaneleyo lokukhupha amanzi kwaye igxininiswe kwisimo esingenakusebenziseka. I-HEC slurries nayo ingalungiswa kunye ne-glycol-based coalescing agents.
4. I-Anti-mildew yepeyinti ye-latex
I-HEC enyibilikayo ngamanzi i-biodegrades xa ibonakaliswe kwi-molds echanekileyo kwi-cellulose kunye ne-derivatives yayo. Ukongeza izithinteli ukupeyinta kuphela akwanelanga, onke amacandelo kufuneka angabina enzyme. Izithuthi zokuvelisa ipeyinti ye-latex kufuneka zigcinwe zicocekile kwaye zicocekile, kwaye zonke izixhobo kufuneka zihlanjululwe rhoqo nge-steam ye-0.5% ye-formalin okanye i-0.1% ye-mercury solution.
Ixesha lokuposa: Apr-25-2024