I-Thickener yinto eqhelekileyo kunye neyona nto isetyenziswa ngokuqhelekileyo i-additive-based based additives kwiingubo ezisekelwe emanzini. Emva kokongeza i-thickener, inokunyusa i-viscosity yenkqubo yokugqoka, ngaloo ndlela ithintele izinto ezixineneyo kwi-coating ukuba zingahlali. Akusayi kubakho mcimbi wokuwohloka ngenxa yokuba i-viscosity yepeyinti ibhityile kakhulu. Kukho iintlobo ezininzi zeemveliso ze-thickener, kunye neentlobo ezahlukeneyo zeemveliso zinemigaqo eyahlukeneyo yokuqina kwiinkqubo ezahlukeneyo zokugquma. Kukho malunga neentlobo ezine zee-thickeners eziqhelekileyo: i-polyurethane thickeners, i-acrylic thickeners, i-inorganic thickeners kunye ne-thickeners ye-cellulose thickeners.
1. Indlela yokujiya ye-associative polyurethane thickener
Iimpawu zesakhiwo se-polyurethane associative thickeners zi-lipophilic, i-hydrophilic kunye ne-lipophilic tri-block polymers, kunye namaqela okugqibela e-lipophilic kuzo zombini iziphelo, ngokuqhelekileyo amaqela e-aliphatic hydrocarbon, kunye necandelo le-polyethylene glycol elinyibilikayo emanzini phakathi. Ngethuba nje kukho inani elaneleyo le-thickener kwinkqubo, inkqubo iya kwenza isakhiwo sothungelwano ngokubanzi.
Kwinkqubo yamanzi, xa uxinaniso lwe-thickener lungaphezu koxinzelelo lwe-micelle olubalulekileyo, amaqela e-lipophilic ekupheleni adibanisa ukwenza i-micelles, kwaye i-thickener yenza isakhiwo sothungelwano ngombutho we-micelles ukwandisa i-viscosity yenkqubo.
Kwinkqubo ye-latex, i-thickener ayikwazi ukwenza umbutho kuphela ngokusebenzisa i-lipophilic terminal group micelles, kodwa kubaluleke kakhulu, iqela le-lipophilic terminal ye-thickener ibhengezwa kumphezulu we-latex particle. Xa amaqela amabini esiphelo se-lipophilic adsorbed kumasuntswana e-latex ahlukeneyo, iimolekyuli ezityebileyo zenza iibhulorho phakathi kwamasuntswana.
2. Indlela yokujiya yepolyacrylic acid alkali ukudumba thickener
I-Polyacrylic acid alkali ukudumba thickener yi-emulsion edibeneyo ye-copolymer, i-copolymer ikhona kwimo ye-asidi kunye namasuntswana amancinci kakhulu, imbonakalo inobisi olumhlophe, i-viscosity iphantsi, kwaye inozinzo oluhle kwi-pH yesondo ephantsi, kwaye ayinyibiliki. emanzini. Xa i-alkaline agent yongezwa, iguqula ibe yi-dispersion ecacileyo kunye ne-swellable kakhulu.
Isiphumo esityebileyo se-polyacrylic acid alkali ukudumba thickener iveliswa ngokungathathi hlangothi kweqela le-carboxylic acid ngehydroxide; xa i-agent ye-alkali yongezwa, iqela le-asidi ye-carboxylic engenziwanga lula i-ionized iguqulwa ngokukhawuleza ibe yi-ionized ammonium carboxylate okanye isinyithi Kwifom yetyuwa, i-electrostatic repulsion effect yenziwa kunye ne-anion centre ye-copolymer macromolecular chain, ukwenzela ukuba umnqamlezo. -ikhonkco ye-copolymer macromolecular chain yanda kwaye yolula ngokukhawuleza. Njengomphumo wokuchithwa kwendawo kunye nokuvuvukala, i-particle yasekuqaleni iphindwe kaninzi kwaye i-viscosity yanda kakhulu. Ekubeni i-crosslinks ayinakuchithwa, i-copolymer kwifom yetyuwa inokuthathwa njenge-copolymer dispersion ene-particles yanda kakhulu.
I-Polyacrylic acid thickeners inesiphumo esihle sokuqina, isantya sokuqina ngokukhawuleza, kunye nozinzo olulungileyo lwebhayoloji, kodwa banochuku kwi-pH, ukunganyangeki kwamanzi, kunye neglosi ephantsi.
3. Indlela yokujiya ye-inorganic thickeners
I-Inorganic thickeners ikakhulu ibandakanya i-bentonite elungisiweyo, i-attapulgite, njl. Nangona kunjalo, ekubeni i-bentonite i-powder ye-inorganic kunye ne-absorption efanelekileyo yokukhanya, inokunciphisa kakhulu i-gloss ye-gloss yefilimu yokugqoka kwaye isebenze njenge-agent matting. Ngoko ke, xa usebenzisa i-bentonite kwipeyinti ye-latex ecwebezelayo, kufuneka kuhlawulwe ingqalelo ekulawuleni umthamo. I-Nanotechnology iye yaqaphela i-nanoscale yamasuntswana angabonakaliyo, kwaye iphinde inike i-inorganic thickeners ngeempawu ezintsha.
Indlela yokujiya ye-inorganic thickeners inzima kakhulu. Ngokuqhelekileyo kukholelwa ukuba ukunyanyiswa phakathi kweentlawulo zangaphakathi kwandisa i-viscosity yepeyinti. Ngenxa yezinga layo elibi, lichaphazela ukukhazimla kunye nokungafihli kwefilimu yepeyinti. Ngokuqhelekileyo isetyenziselwa i-Primer okanye ipeyinti ephezulu yokwakha.
4. Indlela yokujiya ye-cellulose thickener
Ii-cellulose thickeners zinembali ende yophuhliso kwaye zikwasetyenziswa ngokubanzi ii-thickeners. Ngokutsho kwesakhiwo sabo se-molecular, zihlulwe zibe yi-hydroxyethyl cellulose, i-hydroxypropyl cellulose, i-hydroxymethyl cellulose, i-carboxymethyl cellulose, njl., esetyenziswa ngokuqhelekileyo i-hydroxyethyl cellulose (HEC).
Indlela yokutyeba ye-cellulose thickener ikakhulu kukusebenzisa ikhonkco eliphambili le-hydrophobic kwisakhiwo sayo ukwenza iibhondi ze-hydrogen ngamanzi, kwaye kwangaxeshanye zinxibelelana namanye amaqela e-polar kwisakhiwo sawo sokwakha ubume bothungelwano obuthathu kunye nokwandisa umthamo werheological. yepolymer. , thintela indawo yokunyakaza yamahhala yepolymer, ngaloo ndlela ukwandisa i-viscosity yokugqoka. Xa i-shear force isetyenzisiwe, isakhiwo senethiwekhi ye-dimensional-dimensional kutshatyalaliswa, iibhondi ze-hydrogen phakathi kwee-molecule ziyanyamalala, kwaye i-viscosity iyancipha. Xa i-shear force isusiwe, iibhondi ze-hydrogen zenziwe ngokutsha, kwaye isakhiwo senethiwekhi ye-dimensional-dimensional sisekwa kwakhona, ngaloo ndlela siqinisekisa ukuba i-coating ingaba neepropati ezilungileyo. iimpawu zerheological.
I-Cellulosic thickeners zizityebi kumaqela e-hydroxyl kunye namacandelo e-hydrophobic kwisakhiwo sabo. Banobunkunkqele obuphezulu bokutyeba kwaye abanachuku kwi-pH. Nangona kunjalo, ngenxa yokunganyangeki kwabo kwamanzi kunye nokuchaphazela umgangatho wefilimu yepeyinti, kulula Ukuchatshazelwa kukuthotywa kwe-microbial kunye nezinye iintsilelo, i-cellulose thickeners isetyenziselwa ikakhulu ukujiya iipeyinti zelatex.
Kwinkqubo yokulungiswa kweengubo, ukhetho lwe-thickener kufuneka luqwalasele ngokubanzi izinto ezininzi, ezifana nokuhambelana nenkqubo, i-viscosity, ukuzinza kokugcinwa, ukusebenza kokwakhiwa, iindleko kunye nezinye izinto. Ii-thickeners ezininzi zinokudityaniswa kwaye zisetyenziswe ukunika umdlalo opheleleyo kwiinzuzo ze-thickener nganye, kunye nokulawula ngokufanelekileyo iindleko phantsi kwemeko yokusebenza okwanelisayo.
Ixesha lokuposa: Mar-02-2023