Dispersants txhim kho pigment wettability

Cov pigment dispersant HH2011 feem ntau stabilizes pigment hais nyob rau hauv aqueous systems los ntawm electrostatic repulsion, thiab polymers uas muaj acrylic acid los yog maleic anhydride feem ntau yog siv los disperse inorganic pigment hais. Cov pa roj carbon dub thiab cov xim organic feem ntau yog ruaj khov los ntawm nonylphenol polyoxyethylene ether, tab sis vim yog cov tshuaj lom ntawm nonylphenol, lawv tau raug txwv hauv cov txheej txheem txheej. Hydrophobic hydrophilic amphiphilic block polymers yog zoo heev pigment dispersants. Cov ntu hydrophobic nyob rau hauv cov dispersant molecules yog coated nyob rau saum npoo ntawm hais los ntawm hydrophobic kev cuam tshuam nrog carbon dub thiab organic pigments, thaum lub hydrophilic ntu muab stability los ntawm ib tug dual nyhuv ntawm electrostatic thiab steric hindrance. Los ntawm kev tswj cov muaj pes tsawg leeg thiab polymerization degree ntawm hydrophobic thiab hydrophilic ntu, qhov siab tshaj plaws dispersion nyhuv tuaj yeem ua tiav.

Muaj qhov sib txawv tseem ceeb hauv cov xim dispersion ntawm cov kuab tshuaj thiab cov dej-raws li tshuab. Hauv cov kuab tshuaj, kev ntub dej feem ntau yog yooj yim dua vim tias qhov nro ntawm cov kuab tshuaj thiab cov resins qis dua, thiab cov khoom siv tshwj xeeb tsis xav tau los txhim kho cov xim ntub dej. Vim yog lub siab sib thooj ntawm cov dej, cov khoom siv tshwj xeeb xav tau los txo cov npoo av kom muaj kev txiav txim siab kom muaj pigments nrog cov dej tsis txaus ntseeg kom muaj kev sib tw.

Reversible ntxiv fracture saw hloov radical polymerization (RAFT) tuaj yeem tsim cov block polymers. Lub hydrophobic hydrophilic amphiphilic block polymer waterborne dispersant HD-2011 tau tsim los siv RAFT thev naus laus zis rau dispersing carbon dub thiab organic pigments hauv dej. Tom qab kev sim, nws tau pom tias HH2011 dispersant ntawm Houhuan Chemical muaj cov nyhuv dispersing zoo ntawm carbon dub thiab organic pigments. FW200 thiab PV23 xim pastes npaj nrog HH2011 muaj qhov nqaim particle loj tis, zoo flowability, thiab thermal stability, thiab cov xim ntawm cov paste nyob rau hauv latex xim yog zoo.

Hauv coatings, pigments yog ib qho tseem ceeb ntawm cov khoom, thiab optimized particle loj pigments muaj lub siab tshaj plaws npog lub hwj chim thiab xim muaj zog. Txawm li cas los xij, thaum lub sij hawm kev thauj mus los thiab kev cia khoom, cov xim xim tseem ceeb tuaj yeem tsim cov aggregate los yog agglomerates. Nyob rau hauv tus txheej txheem ntawm txheej ntau lawm, nws yog ib qhov tsim nyog yuav tau rov disperse aggregates los yog aggregates rau hauv thawj hais thiab stabilize lawv. Tsuas yog nyob rau hauv txoj kev no tuaj yeem pigments muab cov xim muaj zog, huab cua tsis kam, thiab ruaj khov. Thaum lub sij hawm dispersion txheej txheem, cov pigment hais yog thawj wetted los ntawm cov kua theem, thiab ces cov aggregates yog crushed los ntawm mechanical quab yuam. Lub luag haujlwm ntawm dispersants yog kom stabilize lub crushed hais thiab tiv thaiv lawv re aggregation.