I-Thickeners yepeyinti ye-latex kufuneka ihambelane kakuhle kunye ne-latex polymer compounds, ngaphandle koko kuya kubakho inani elincinci lokuthungwa kwifilimu yokugqoka, kwaye ukuhlanganiswa kwamasuntswana angenakuguquleka kuya kwenzeka, okukhokelela ekunciphiseni kwe-viscosity kunye nobukhulu be-particle size. I-Thickeners iya kutshintsha intlawulo ye-emulsion. Umzekelo, i-cationic thickeners iya kuba nefuthe elingenakuguquleka kwi-anionic emulsifiers kwaye ibangele ukuchithwa. Isingqimba sepeyinti yelatex esifanelekileyo kufuneka sibe nezi mpawu zilandelayo:
1. Idosi ephantsi kunye ne-viscosity enhle
2. Uzinzo oluhle lokugcina, aluyi kunciphisa i-viscosity ngenxa yesenzo se-enzymes, kwaye ayiyi kunciphisa i-viscosity ngenxa yokutshintsha kweqondo lokushisa kunye nexabiso le-pH.
3. Ukugcinwa kakuhle kwamanzi, akukho amaqamza omoya acacileyo
4. Akukho miphumo emibi kwiipropati zefilimu yepeyinti ezifana nokuchasana nokukhuhla, i-gloss, amandla okufihla kunye nokumelana kwamanzi
5. Akukho flocculation of pigments
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 ye-latex, i-hydroxyethyl cellulose (HEC) isetyenziswa njenge-dispersant, i-thickener kunye ne-pigment yokumisa i-agent ukuzinzisa i-viscosity yemveliso, ukunciphisa i-agglomeration, yenza ifilimu yepeyinti igudiswe kwaye igudiswe, kwaye yenza ipeyinti ye-latex ihlale ixesha elide. . 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 ukuxubha, ukuqengqeleka, ukuzalisa, ukutshiza kunye nezinye iindlela zokwakha kuneengenelo zokonga umsebenzi, akukho lula ukucacisa, ukugoba, kunye nokutshiza okuncinci. I-HEC inophuhliso oluhle lombala. Inokugqwesa okugqwesileyo kwemibala emininzi kunye nezibophelelo, okwenza ipeyinti ye-latex ibe nombala obalaseleyo kunye nozinzo. I-Versatility yesicelo ekuqulunqweni, i-ether engeyiyo ionic. Ke ngoko, inokusetyenziswa kuluhlu olubanzi lwe-pH (2 ~ 12), kwaye inokuxutywa kunye namacandelo kwipeyinti ye-latex ngokubanzi njenge-pigment esebenzayo, izongezo, iityuwa ezinyibilikayo okanye i-electrolytes.
Akukho mpembelelo imbi kwifilimu yokugquma, kuba isisombululo se-HEC samanzi sineempawu ezicacileyo zoxinzelelo lwamanzi, akukho lula ukukhupha amagwebu ngexesha lemveliso kunye nokwakhiwa, kwaye ukuthambekela kwemingxuma ye-volcanic kunye ne-pinholes kuncinci.
Uzinzo oluhle lokugcina. Ngexesha lokugcinwa kwexesha elide, i-dispersibility kunye nokumiswa kwe-pigment kunokugcinwa, kwaye akukho ngxaki yombala ojikelezayo kunye nokuqhakaza. Kukho umaleko omncinci wamanzi kumphezulu wepeyinti, kwaye xa ubushushu 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-coating surface yepeyinti esekwe emanzini inokusebenzisa i-HEC.
Okwangoku, i-thickeners esetyenziswa kwikhaya eliphakathi kunye ne-high-grade latex ipeyinti ithunyelwa ngaphandle kwe-HEC kunye ne-acrylic polymer (kuquka i-polyacrylate, 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-10-30mPaS isetyenziswa. I-HEC enokusetyenziswa ukuya kuthi ga kwi-300mPa·S iya kuba nesiphumo esingcono sokusasazeka ukuba isetyenziswe ngokudityaniswa ne-anionic okanye i-cationic surfactants. Idosi yereferensi ngokuqhelekileyo yi-0.05% yobunzima be-monomer.
2. Njengesityebi
Sebenzisa i-15000mPa. I-reference dosage ye-high-viscosity HEC ngaphezu kwe-s yi-0.5-1% yobunzima obupheleleyo bepeyinti ye-latex, kwaye ixabiso le-PVC linokufikelela malunga ne-60%. Sebenzisa i-HEC malunga ne-20Pa, kwipeyinti ye-latex, kunye nokusebenza kwepeyinti ye-latex yeyona nto ingcono. Iindleko zokusebenzisa i-HEC ngaphezulu kwe-30O00Pa.s zisezantsi. Nangona kunjalo, iimpawu zokulinganisa zepeyinti ye-latex azilungile. Ngokombono weemfuno zomgangatho kunye nokunciphisa iindleko, kungcono ukusebenzisa i-HEC ephakathi kunye nephezulu ye-viscosity kunye.
3. Indlela yokuxuba kwipeyinti yelatex
I-HEC ephathwe ngomphezulu inokongezwa kumgubo owomileyo okanye kwifomu yokuncamathisela. Ipowder eyomileyo yongezwa ngokuthe ngqo kwi-pigment grind. I-pH kwindawo yokutya kufuneka ibe yi-7 okanye ngaphantsi. Amacandelo e-alkaline afana ne-Yanbian dispersant anokongezwa emva kokuba i-HEC imanzi kwaye ihlakazwe ngokupheleleyo. I-Slurries eyenziwe nge-HEC kufuneka idibaniswe kwi-slurry ngaphambi kokuba i-HEC ibe nexesha elaneleyo lokukhupha amanzi kwaye ivumele ukuba idibanise kwisimo esingasebenzisekiyo. Kwakhona kunokwenzeka ukulungiselela i-HEC pulp kunye ne-ethylene glycol coalescing agents.
4. I-Anti-mold yepeyinti ye-latex
I-HEC ene-soluble yamanzi iya ku-biodegrade xa idibene ne-molds enemiphumo ekhethekileyo kwi-cellulose kunye ne-derivatives yayo. Akwanelanga ukongeza izigcini kwipeyinti yodwa, onke amacandelo kufuneka angabi ne-enzyme. Isithuthi sokuvelisa ipeyinti ye-latex kufuneka igcinwe icocekile, kwaye zonke izixhobo kufuneka zihlanjululwe rhoqo nge-steam ye-0.5% ye-formalin okanye i-O.1% ye-mercury solution.
Ixesha lokuposa: Dec-26-2022