Ipeyinti yeLatex ngumxube wee-pigments, i-filler dispersions kunye ne-polymer dispersions, kunye nezongezelelo kufuneka zisetyenziswe ukulungisa i-viscosity yayo ukuze ibe neepropati ze-rheological ezifunekayo kwisigaba ngasinye sokuvelisa, ukugcinwa kunye nokwakhiwa. Izongezo ezinjalo ngokuqhelekileyo zibizwa ngokuba zi-thickeners, ezinokunyusa i-viscosity ye-coatings kunye nokuphucula iimpawu ze-rheological ze-coatings, ngoko ke zibizwa ngokuba yi-rheological thickeners.
Oku kulandelayo kwazisa kuphela iimpawu eziphambili ze-cellulose thickeners ezisetyenziswa ngokuqhelekileyo kunye nokusetyenziswa kwazo kwiipende ze-latex.
Izinto zeCellulozic ezinokuthi zisetyenziswe kwiingubo ziquka i-methyl cellulose, i-hydroxyethyl cellulose, kunye ne-hydroxypropyl methyl cellulose. Olona phawu lukhulu lwe-cellulose thickener kukuba isiphumo sokuqina siyaphawuleka, kwaye inokunika ipeyinti isiphumo esithile sokugcina amanzi, esinokulibazisa ixesha lokumisa ipeyinti ukuya kwinqanaba elithile, kwaye kwakhona yenza ipeyinti ibe nethixotropy ethile, ukuthintela ipeyinti ukuba yome. Imvula kunye ne-stratification ngexesha lokugcinwa, nangona kunjalo, i-thickeners enjalo nayo inobungozi bomgangatho ophantsi wepeyinti, ngakumbi xa usebenzisa amabakala aphezulu e-viscosity.
I-Cellulose yinto enomsoco kwi-microorganisms, ngoko ke amanyathelo okulwa ne-mildew kufuneka aqiniswe xa usebenzisa. I-Cellulosic thickeners inokutyebisa kuphela isigaba samanzi, kodwa ayinayo impembelelo yokuqina kwamanye amacandelo kwipeyinti esekwe emanzini, kwaye ayinakubangela intsebenziswano ebalulekileyo phakathi kwebala kunye ne-emulsion particles kwipeyinti, ngoko ke abanako ukuhlengahlengisa i-rheology yepeyinti. , Ngokubanzi, inokunyusa kuphela i-viscosity yengubo kwizinga eliphantsi kunye neliphakathi lokucheba (elihlala libizwa ngokuba yi-KU viscosity).
1. Iselulosi yeHydroxyethyl
Ukucaciswa kunye neemodeli zeemveliso ze-hydroxyethyl cellulose zihlukaniswa ngokukodwa ngokwenqanaba lokutshintshwa kunye ne-viscosity. Ukongeza kumahluko kwi-viscosity, iintlobo ze-hydroxyethyl cellulose zinokwahlulwa zibe luhlobo oluqhelekileyo lokunyibilika, uhlobo lokusasazeka ngokukhawuleza kunye nohlobo lozinzo lwebhayoloji ngokuguqulwa kwenkqubo yokuvelisa. Ngokubhekiselele kwindlela yokusetyenziswa, i-hydroxyethyl cellulose inokongezwa kwizigaba ezahlukeneyo kwinkqubo yokuvelisa i-coating. Uhlobo olusasaza ngokukhawuleza lunokongezwa ngokuthe ngqo ngendlela yomgubo owomileyo, kodwa ixabiso le-pH lenkqubo ngaphambi kokuba lidibanise kufuneka libe ngaphantsi kwe-7, ngokukodwa ngenxa yokuba i-hydroxyethyl cellulose inyibilika ngokukhawuleza kwixabiso eliphantsi le-pH, kwaye kukho ixesha elaneleyo amanzi ukungena ngaphakathi kwi-particle, kwaye emva koko ukwandisa ixabiso le-pH ukuze lichithe ngokukhawuleza. Amanyathelo ahambelanayo nawo angasetyenziselwa ukulungiselela i-concentration ethile yeglue kwaye uyongeze kwinkqubo yepeyinti.
2. I-Hydroxypropyl Methyl Cellulose
Isiphumo sokuqina kwe-hydroxypropyl methylcellulose ngokusisiseko siyafana naleyo ye-hydroxyethylcellulose, oko kukuthi, ukunyusa i-viscosity yokwambathisa kumazinga aphantsi naphakathi okucheba. IHydroxypropyl methylcellulose iyamelana nokuwohloka kwe-enzymatic, kodwa ukunyibilika kwayo emanzini akulunganga njengaleyo ye-hydroxyethyl cellulose, kwaye inengxaki yokugawula xa ishushu. Kwi-surface-treated hydroxypropyl methylcellulose, inokongezwa ngokuthe ngqo emanzini xa isetyenzisiwe, emva kokuvuselela kunye nokusabalalisa, yongeza izinto ze-alkaline ezifana namanzi e-ammonia, ulungelelanise ixabiso le-pH kwi-8-9, kwaye ugxobhoze de uchithe ngokupheleleyo. Kwi-hydroxypropyl methylcellulose ngaphandle konyango lomphezulu, inokuxutywa kwaye idumbe ngamanzi ashushu ngaphezu kwe-85 ° C ngaphambi kokusetyenziswa, kwaye emva koko ipholile kwiqondo lokushisa, emva koko ixutywe ngamanzi abandayo okanye amanzi e-ice ukuze ichithe ngokupheleleyo.
3. I-Methyl cellulose
I-Methylcellulose ineepropati ezifanayo kwi-hydroxypropylmethylcellulose, kodwa ayizinzile kwi-viscosity kunye nobushushu.
I-Hydroxyethyl cellulose yeyona nto isetyenziswa kakhulu kwipeyinti ye-latex, kwaye isetyenziswa kwiipeyinti zelatex zodidi oluphezulu, oluphakathi kunye noluphantsi kunye nepeyinti eshinyeneyo yokwakha. Isetyenziswe ngokubanzi ekuxubeni kwepeyinti ye-latex eqhelekileyo, i-gray calcium powder latex paint, njl. Eyesibini i-hydroxypropyl methylcellulose, esetyenziswa kwakhona kwisixa esithile ngenxa yokukhuthazwa kwabavelisi. I-Methyl cellulose ayisetyenziswanga kwipeyinti ye-latex, kodwa isetyenziswa kakhulu kwi-powdery yangaphakathi kunye ne-putty yangaphandle eludongeni ngenxa yokuchithwa kwayo kwangoko kunye nokugcinwa kakuhle kwamanzi. I-high-viscosity methyl cellulose inokunika i-putty nge-thixotropy ebalaseleyo kunye nokugcinwa kwamanzi, okwenza ibe neempawu ezintle zokukrala.
Ixesha lokuposa: Jan-03-2023