Izinto zokuthina zepeyinti yelatex kufuneka zihambelane kakuhle neekhompawundi zelatex polymer, kungenjalo kuya kubakho ubume obuncinci kwifilimu yokugquma, kwaye ukuhlanganiswa kwee-particle ezingenakuguqulwa kuya kwenzeka, okubangela ukwehla kwe-viscosity kunye nobukhulu bee-particle eziqinileyo. Izinto zokuthina ziya kutshintsha itshaja ye-emulsion. Umzekelo, izinto zokuthina ze-cationic ziya kuba nefuthe elingenakuguqulwa kwi-anionic emulsifiers kwaye zibangele i-demulsification. I-thickener yepeyinti yelatex efanelekileyo kufuneka ibe nezi mpawu zilandelayo:
1. Idosi ephantsi kunye nokuqina okuhle
2. Uzinzo oluhle lokugcina, aluyi kunciphisa i-viscosity ngenxa yesenzo see-enzyme, kwaye aluyi kunciphisa i-viscosity ngenxa yotshintsho kubushushu kunye nexabiso le-pH
3. Ukugcinwa kwamanzi kakuhle, akukho maqamza omoya acacileyo
4. Akukho ziphumo zimbi kwiimpawu zefilimu yepeyinti ezinje ngokuxhathisa ukukhuhla, ukucwebezela, amandla okufihla kunye nokumelana namanzi
5. Akukho ukuxinana kweepigment
Itekhnoloji yokwandisa ipeyinti yelatex yindlela ebalulekileyo yokuphucula umgangatho welatex nokunciphisa iindleko. I-Hydroxyethyl cellulose sisixhobo esifanelekileyo sokwandisa ipeyinti yelatex, esineempembelelo ezininzi ekusebenzeni kwayo, ukuzinzisa kunye nokulungiswa kwerheological kwepeyinti yelatex.
Kwinkqubo yokuvelisa ipeyinti yelatex, i-hydroxyethyl cellulose (HEC) isetyenziswa njenge-dispersant, i-thickener kunye ne-pigment suspension agent ukuzinzisa i-viscosity yemveliso, ukunciphisa i-agglomeration, ukwenza ifilimu yepeyinti ithambe kwaye igudileyo, kunye nokwenza ipeyinti yelatex ihlale ixesha elide. I-rheology elungileyo, inokumelana namandla aphezulu okucheba, kwaye inokubonelela ngokulingana okuhle, ukumelana nokukrwela kunye nokufana kwepigment. Kwangaxeshanye, i-HEC inokusebenza kakuhle, kwaye ipeyinti yelatex etyebileyo nge-HEC ine-pseudoplasticity, ngoko ke ukubrasha, ukuqengqeleka, ukuzalisa, ukutshiza kunye nezinye iindlela zokwakha kuneenzuzo zokonga abasebenzi, akukho lula ukuyicoca, iyawa, kwaye ayitshisi kakhulu. I-HEC inophuhliso oluhle kakhulu lombala. Inokungafani kakuhle kwiindidi ezininzi zemibala kunye nezihlanganisi, nto leyo eyenza ipeyinti yelatex ibe nokuhambelana okuhle kombala kunye nozinzo. Ukuguquguquka kokusetyenziswa kwiifomyula, yi-ether engeyiyo i-ionic. Ngoko ke, ingasetyenziswa kuluhlu olubanzi lwe-pH (2 ~ 12), kwaye ingaxutywa nezinto ezikwipeyinti yelatex ngokubanzi ezifana neepigments ezisabelayo, izongezo, iityuwa ezinyibilikayo okanye ii-electrolytes.
Akukho mpembelelo imbi kwifilimu yokugquma, kuba isisombululo samanzi se-HEC sineempawu ezicacileyo zokuxinana kwamanzi, akulula ukusenza sibe negwebu ngexesha lokwenziwa nokwakhiwa, kwaye ukuthambekela kwemingxunya yentaba-mlilo kunye nemingxunya yepinki kuncinci.
Uzinzo oluhle lokugcina. Ngexesha lokugcina ixesha elide, umbala ungasasazeka kwaye umiswe, kwaye akukho ngxaki yokuba umbala udada kwaye uqhakaze. Akukho maleko manzi mkhulu kumphezulu wepeyinti, kwaye xa ubushushu bokugcina butshintsha kakhulu. Ukuqina kwayo kusazinzile.
I-HEC inganyusa ixabiso le-PVC (uxinzelelo lomthamo wepigment) ukwakheka okuqinileyo ukuya kuthi ga kwi-50-60%. Ukongeza, isithambisi somphezulu wepeyinti esekelwe emanzini singasebenzisa ne-HEC.
Okwangoku, izithambisi ezisetyenziswa kwiipeyinti zelatex zasekhaya eziphakathi neziphezulu zingeniswa kwi-HEC kunye ne-acrylic polymer (kuquka i-polyacrylate, i-homopolymer okanye i-copolymer emulsion thickeners ze-acrylic acid kunye ne-methacrylic acid).
I-Hydroxyethyl cellulose ingasetyenziselwa
1. Njenge-dispersant okanye iglu yokukhusela
Ngokubanzi, kusetyenziswa i-HEC ene-viscosity ye-10-30mPaS. I-HEC enokusetyenziswa ukuya kuthi ga kwi-300mPa·S iya kuba nefuthe elingcono lokusasazeka ukuba isetyenziswa kunye ne-anionic okanye i-cationic surfactants. Idosi yesalathiso ngokubanzi yi-0.05% yobunzima be-monomer.
2. Njengesithambisi-mafutha
Sebenzisa i-15000mPa. Umlinganiselo oqhelekileyo we-HEC ene-viscosity ephezulu ngaphezu kwe-s yi-0.5-1% yobunzima bepeyinti ye-latex iyonke, kwaye ixabiso le-PVC lingafikelela malunga ne-60%. Sebenzisa i-HEC emalunga ne-20Pa,s kwipeyinti ye-latex, kwaye ukusebenza kwepeyinti ye-latex yeyona ilungileyo. Ixabiso lokusebenzisa nje i-HEC engaphezulu kwe-30O00Pa.s liphantsi. Nangona kunjalo, iipropati zokulinganisa ipeyinti ye-latex azilungile. Ngokweemfuno zomgangatho kunye nokunciphisa iindleko, kungcono ukusebenzisa i-HEC ephakathi nephezulu kunye.
3. Indlela yokuxuba ipeyinti yelatex
I-HEC ecociweyo phezu komhlaba ingongezwa ngomgubo owomileyo okanye ngendlela yokuncamathisela. Umgubo owomileyo wongezwa ngqo kwi-pigment grind. I-pH kwindawo yokutya kufuneka ibe yi-7 okanye ngaphantsi. Izinto ze-alkaline ezifana ne-Yanbian dispersant zingongezwa emva kokuba i-HEC imanzisiwe kwaye isasazeke ngokupheleleyo. Iislurry ezenziwe nge-HEC kufuneka zidityaniswe kwislurry ngaphambi kokuba i-HEC ibe nexesha elaneleyo lokufumisa kwaye ivumele ukuba iqine ukuya kwimeko engasetyenziswayo. Kukwanokwenzeka ukulungiselela i-HEC pulp ngee-ethylene glycol coalescing agents.
4. Ipeyinti yelatex echasene nokungunda
I-HEC enyibilikayo emanzini iya kubola xa idibana neenkuni ezinefuthe elikhethekileyo kwi-cellulose kunye nezinto eziphuma kuyo. Akwanelanga ukongeza izithinteli kwipeyinti yodwa, zonke izinto kufuneka zingabi na-enzyme. Isixhobo sokuvelisa ipeyinti ye-latex kufuneka sigcinwe sicocekile, kwaye zonke izixhobo kufuneka zihlanjululwe rhoqo ngesisombululo se-0.5% formalin okanye i-O.1% ye-mercury.
Ixesha lokuthumela: Disemba-26-2022