I-thickener yepeyinti yelatex kufuneka ihambelane kakuhle ne-emulsion polymer compound, kungenjalo ifilimu yokugquma iya kuba ne-reticulate encinci, kwaye iya kuvelisa i-reversible particle agglomeration, eya kunciphisa i-viscosity kwaye iqokelele ubungakanani be-particle. I-thickener iya kutshintsha itshaja ye-emulsion. Umzekelo, i-cationic thickener iya kuba nefuthe elingenakuguquguquka kwi-anionic emulsifier ukuze iphule i-emulsion. I-thickener efanelekileyo yepeyinti yelatex kufuneka ibe nezi mpawu zilandelayo:
1. Idosi ephantsi kunye nokuqina okuhle
2. Uzinzo oluhle lokugcina, akukho nciphiso ye-viscosity ngenxa yesenzo see-enzymes, kwaye akukho nciphiso ye-viscosity ngenxa yotshintsho kubushushu kunye nexabiso le-PH
3, ukugcinwa kwamanzi kakuhle, akukho nto ibonakalayo yeqamza
4. Akukho ziphumo zimbi kwiipropati zefilimu ezinje ngokuxhathisa ukukhuhla, ukucwebezela, amandla okuzifihla kunye nokuxhathisa amanzi
5. Akukho pigment flocculation
Itekhnoloji yokwandisa ipeyinti yelatex yindlela ebalulekileyo yokuphucula umgangatho welatex nokunciphisa iindleko. IHydroxyethyl 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 njengesixhobo sokunyibilikisa, sokutyebisa kunye nesixhobo sokumisa i-pigment ukuzinzisa i-viscosity yemveliso, ukunciphisa i-agglomeration, ukwenza ifilimu yepeyinti ibe bushelelezi kwaye igudileyo, kwaye yenze ipeyinti ye-latex ihlale ixesha elide. I-rheology elungileyo, inokumelana namandla aphezulu okucheba, kwaye inokubonelela ngokulingana okuhle, ukumelana nokukrwela kunye nokufana kwe-pigment. Kwangaxeshanye, i-HEC inokusebenza kakuhle, kwaye ipeyinti ye-latex etyebileyo nge-HEC ine-pseudoplasticity, ngoko ke iindlela zokwakha ezifana nokubrasha, ukuqengqeleka, ukuzalisa, kunye nokutshiza zinezibonelelo zokonga abasebenzi, akukho lula ukuyicoca nokuwa, kwaye ayitshisi kangako. I-HEC inophuhliso oluhle kakhulu lombala. Inokungafani kakuhle kunye nee-colorants ezininzi kunye nee-binders, okwenza kube nokwenzeka ukwenza ipeyinti ye-latex enobungqingqwa obuhle bombala kunye nokuzinza. Ngenxa yokuguquguquka okusetyenzisiweyo kwifomyula, yi-ether engeyiyo i-ionic. Ke ngoko, ingasetyenziswa kuluhlu olubanzi lwe-pH (2 ~ 12), kwaye ingaxutywa nezinto zepeyinti ze-latex ngokubanzi ezifana neepigments ezisabelayo, izongezo, iityuwa ezinyibilikayo okanye ii-electrolytes.
Akukho mpembelelo imbi kwifilimu yokugquma. Ngenxa yokuba isisombululo samanzi se-HEC sineempawu ezicacileyo zokuxinana kwamanzi, akulula ukusenza sibe negwebu ngexesha lokwenziwa nokwakhiwa, kwaye ukuthambekela kwemingxuma yentaba-mlilo kunye nemingxuma yephini kuncinci.
Uzinzo oluhle lokugcina. Kwinkqubo yokugcina ixesha elide, ukusasazeka kunye nokumiswa kwepigment kunokugcinwa, kwaye akukho ngxaki yokuba umbala udada kwaye uqhakaze. Xa kukho umaleko omncinci wamanzi kumphezulu wepeyinti kwaye 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, i-topcoat thickener yepeyinti esekelwe emanzini ingasebenzisa ne-HEC.
Okwangoku, izithambisi ezisetyenziswa kwiipeyinti zelatex zasekhaya ezikumgangatho ophezulu zi-HEC kunye nee-acrylic polymers ezingeniswa kwamanye amazwe (kuquka ii-polyacrylates, ii-homopolymer okanye ii-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 ukuya kwi-30 mPaS. I-HEC efikelela kwi-300mPa·S ingasetyenziswa kunye ne-anionic okanye i-cationic surfactants, kwaye isiphumo sokusasazwa singcono. Isixa sesalathiso ngokubanzi yi-0.05% yobunzima be-monomer.
2, njengesithambisi
Sebenzisa i-15000mPa. Umlinganiselo oqhelekileyo we-HEC ene-viscosity ephezulu ngaphezulu kwe-s yi-0.5 ukuya kwi-1% yobunzima obupheleleyo be-latex coating, kwaye ixabiso le-PVC lingafikelela malunga ne-60%. Kwipeyinti ye-latex, kusetyenziswa i-HEC emalunga ne-20Pa,s, kwaye iipropati ezahlukeneyo zepeyinti ye-latex zezona zilungileyo. Ixabiso lokusebenzisa nje i-HEC engaphezulu kwe-30O00Pa.s liphantsi. Nangona kunjalo, ukulingana kunye nezinye iimpawu zepeyinti ye-latex azilungile. Ngokweemfuno zomgangatho kunye nokunciphisa iindleko, kungcono ukusebenzisa i-HEC ephakathi kunye ne-viscosity ephezulu kunye.
3. Indlela yokufaka ipeyinti yelatex
I-HEC ecociweyo phezu komhlaba ingongezwa ngomgubo owomileyo okanye ngohlobo lwe-slurry. Umgubo owomileyo wongezwa ngokuthe ngqo kwi-pigment grinding. I-pH yendawo yokongeza kufuneka ibe yi-7 okanye ngaphantsi. Izinto ze-alkaline ezifana nezinyibilikisi zingongezwa emva kokubaI-HECsele imanzisiwe kwaye isasazeke ngokupheleleyo. I-slurry eyenziwe nge-HEC kufuneka idityaniswe ne-slurry ngaphambi kokuba i-HEC ibe nexesha elaneleyo lokufumisa kwaye ijiye ifikelele kwimeko engasetyenziswayo. I-slurry ze-HEC zingalungiswa ngee-agents ze-glycol-based coalescing.
4. Ipeyinti yelatex elwa nokungunda
Ii-biodegrades ze-HEC ezinyibilikayo emanzini xa zichatshazelwe kwiinkuni ezikhethekileyo kwi-cellulose kunye nezinto eziphuma kuyo. Ukongeza izithinteli kwipeyinti yodwa akwanelanga, zonke izinto kufuneka zingabi na-enzyme. Iindlela zokuvelisa ipeyinti ye-latex kufuneka zigcinwe zicocekile kwaye zicocekile, kwaye zonke izixhobo kufuneka zihlanjululwe rhoqo ngesisombululo se-0.5% formalin somphunga okanye i-0.1% ye-mercury.
Ixesha leposi: Epreli-25-2024