I. Kakaretso
E le e 'ngoe ea lisebelisoa tse tala tsa ho roala, palo ea li-additives hangata e nyenyane haholo (ka kakaretso e ka ba 1% ea kakaretso ea tlhahiso), empa phello e ntle haholo. Ho eketsoa ha eona ho ke ke ha qoba liphoso tse ngata tsa ho roala le bofokoli ba filimi, empa hape ho etsa hore tlhahiso le ts'ebetso ea kaho ea ho roala e be bonolo ho e laola, 'me ho eketsoa ha li-additives tse itseng ho ka fana ka ho roala ka mesebetsi e itseng e khethehileng. Ka hona, li-additives ke karolo ea bohlokoa ea ho roala.
2. Sehlopha sa li-additives
Li-additives tse atisang ho sebelisoa bakeng sa ho roala li kenyelletsa li-anti-settling agents, li-thickeners, li-level, li-agent tsa ho laola foam, li-adhesion promoters, li-anti-settling agents, joalo-joalo.
3. Ts'ebetso le ts'ebeliso ea li-additives
(1) Sehlahisoa se khahlanong le ho rarolla
Bongata ba lihlahisoa tsena li thehiloe holim'a polyolefin, e qhalakantsoeng ka har'a solvent, ka linako tse ling e fetoloa ka motsoako oa oli ea castor. Li-additives tsena li tla ka mefuta e meraro: metsi, paste le phofo.
1. Lintho tsa Rheological:
Mosebetsi o ka sehloohong oa rheological oa li-anti-settling agents ke ho laola ho emisoa ha li-pigments - ke hore, ho thibela ho rarolla ka thata kapa ho qoba ho rarolla ka ho feletseng, e leng ts'ebeliso ea bona e tloaelehileng. Empa ka ts'ebetso, e baka keketseho ea viscosity le tekanyo e itseng ea ho hanyetsa, haholo-holo ka liaparo tsa indasteri. Li-anti-settlement agents li tla qhibiliha ka lebaka la mocheso o phahameng, kahoo li lahleheloe ke katleho ea tsona, empa rheology ea bona e tla hlaphoheloa ha tsamaiso e ntse e pholile.
2. Tšebeliso ea organic anti-settlement agent:
E le ho etsa hore moemeli oa anti-setting a sebetse ka katleho ka ho roala, o lokela ho qhalakanngoa hantle le ho sebetsa. Mehato e khethehileng ke e latelang:
(1) Ho kolobisa (phofo e ommeng feela). Mokelikeli o omileng oa phofo ea organic anti-sedimentation ke motsoako, e le hore o arole likaroloana ho tloha ho tse ling, o tlameha ho kolobisoa ke solvent le (kapa) resin. Hangata ho lekane ho e kenyelletsa ho slurry ea ho sila ka moferefere o itekanetseng.
(2) Deagglomeration (feela bakeng sa phofo e omileng). Matla a aggregation a organic anti-sedimentation agents ha a matla haholo, 'me motsoako o bonolo oa moferefere o lekane maemong a mangata.
(3) Ho hasana, ho futhumatsa, nako ea ho hasana (mefuta eohle). Lisebelisoa tsohle tsa organic anti-sedimentation li na le mocheso o tlase oa ts'ebetso, 'me haeba o sa fihlelle, ho sa tsotelehe hore na matla a qhalakaneng a maholo hakae, ho ke ke ha ba le ts'ebetso ea rheological. Mocheso oa ts'ebetso o itšetlehile ka solvent e sebelisitsoeng. Ha mocheso o tlase o feta, khatello ea maikutlo e kentsoeng e tla kenya tšebetsong organic anti-sedimentation agent mme e fane ka papali e felletseng ts'ebetsong ea eona.
(2) Motenya
Ho na le mefuta e fapaneng ea li-thickeners tse sebelisoang lipenteng tse thehiloeng ho solvent le metsi. Mefuta e tloaelehileng ea li-thickeners tse sebelisoang ho koahela ka metsing ke: cellulose ethers, polyacrylates, associative thickeners le inorganic thickeners.
1. Sehlahisoa se sebelisoang ka ho fetisisa sa cellulose ether thickener ke hydroxyethyl cellulose (HEC). Ho itšetlehile ka viscosity, ho na le litlhaloso tse fapaneng. HEC ke phofo e qhibilihang ka metsing, e leng motsoako o se nang ionic. E na le phello e ntle ea ho thibela metsi, ho hanyetsa metsi hantle le ho hanyetsa alkali, empa mefokolo ea eona ke hore ho bonolo ho hōla hlobo, ho bola, 'me ho na le thepa e fokolang ea boemo.
2. Polyacrylate thickener ke emulsion ea acrylate copolymer e nang le lintho tse ngata tsa carboxyl, 'me tšobotsi ea eona e kholo ka ho fetisisa ke ho hanyetsa ha eona ho hlasela hlobo. Ha pH e le 8-10, mofuta ona oa "thickener" oa ruruha 'me o eketsa viscosity ea mohato oa metsi; empa ha pH e le kholo ho feta 10, e qhibiliha ka metsing 'me e lahleheloa ke phello ea eona e teteaneng. Ka hona, ho na le kutloisiso e kholo ho pH. Hajoale, metsi a ammonia ke ona pH e sebelisoang haholo bakeng sa lipente tsa latex Chaena. Ka hona, ha mofuta ona oa "thickener" o sebelisoa, boleng ba pH bo tla fokotseha ka ho fetoha ha metsi a ammonia, 'me phello ea eona e teteaneng e tla fokotseha.
3. Li-thickeners tsa associative li na le mekhoa e fapaneng ea ho tiisa ho tloha ho mefuta e meng ea li-thickeners. Li-thickeners tse ngata li tlisa viscosity ka hydration le ho thehoa ha sebopeho se fokolang sa gel tsamaisong. Leha ho le joalo, li-asociative thickeners, joalo ka li-surfactants, li na le likarolo tse peli tsa hydrophilic le likarolo tsa oli e hloekisang e mosehla ka molek'huleng. Likarolo tsa hydrophilic li ka tšeloa metsi 'me tsa ruruha ho tiisa karolo ea metsi. Lihlopha tsa ho qetela tsa lipophilic li ka kopanngoa le likaroloana tsa emulsion le likaroloana tsa pigment. amahanya ho etsa sebopeho sa marangrang.
4. The inorganic thickener e emeloa ke bentonite. Hangata bentonite e thehiloeng metsing e ruruha ha e monya metsi, 'me molumo ka mor'a ho noa metsi ke makhetlo a' maloa molumo oa eona oa pele. Ha e sebetse feela joalo ka motenya, empa hape e thibela ho teba, ho thella le ho phaphamala ha 'mala. Phello ea eona e teteaneng e molemo ho feta ea alkali-swellable acrylic le polyurethane thickeners ka tekanyo e lekanang. Ho feta moo, e boetse e na le mefuta e mengata ea ho ikamahanya le maemo a pH, botsitso bo botle ba ho qhibiliha le botsitso ba likokoana-hloko. Hobane ha e na li-surfactants tse qhibilihang ka metsing, likaroloana tse ntle tsa filimi e omeletseng li ka thibela ho falla ha metsi le ho hasana, 'me li ka ntlafatsa ho hanyetsa metsi ha filimi ea ho roala.
(3) moemeli oa boemo
Ho na le mefuta e meraro ea mantlha ea li-agent tse sebelisoang hangata:
1. Moemeli oa boemo bo fetotsoeng oa mofuta oa polysiloxane
Sehlahisoa sa mofuta ona se ka fokotsa ka matla tsitsipano ea holim'a seaparo, ea ntlafatsa ho koloba ha lesela ho substrate, le ho thibela shrinkage; e ka fokotsa phapang ea tsitsipano holim'a filimi e metsi ka lebaka la ho qhibiliha ha solvent, ho ntlafatsa boemo ba ho phalla ha metsi, le ho etsa hore pente e potlake ho lekanngoa; mofuta ona oa boemo ba boemo bo ka boela ba theha filimi e tšesaane haholo le e boreleli holim'a filimi ea ho roala, ka tsela eo e ntlafatsa ho boreleli le ho phatsima ha filimi ea ho roala.
2. Moemeli oa ho lekanya mofuta oa resin oa ketane e telele o nang le tumellano e fokolang
Tse kang acrylate homopolymer kapa copolymer, e ka fokotsang tsitsipano ea holim'a seaparo le substrate ho isa tekanyong e itseng ho ntlafatsa metsi le ho thibela ho fokotseha; 'me e ka theha tekanyo e le' ngoe ea limolek'hule holim'a filimi ea ho roala ho eketsa tsitsipano ea holim'a ho roala Homogenize, ho ntlafatsa metsi a holim'a metsi, ho thibela lebelo la ho qhibiliha ha solvent, ho felisa liphoso tse kang lekhapetla la lamunu le matšoao a borashe, le ho etsa hore filimi ea ho roala e be boreleli le esita le.
3. Moemeli oa boemo bo phahameng o nang le mokelikeli o phahameng oa ho belisa e le karolo ea mantlha
Mofuta ona oa moemeli oa boemo o ka fetola sekhahla sa ho roala ha mokelikeli, e le hore filimi ea ho roala e be le tekanyo e leka-lekaneng ea volatilization le solvency nakong ea ts'ebetso ea ho omisa, 'me e thibela ho phalla ha filimi ea ho roala hore e se ke ea sitisoa ke ho phatloha ha solvent ka potlako le ho feta. viscosity e phahame haholo, 'me e baka mathata a fokolang,' me e ka thibela ho fokotseha ho bakoang ke ho qhibiliha ho fokolang ha thepa ea motheo le pula e bakoang ke ho qhibiliha ha solvent ka potlako.
(4) Moemeli oa ho laola foam
Lisebelisoa tsa ho laola foam li boetse li bitsoa li-antifoaming agents kapa li-defoaming agents. Li-anti-foaming agents li thibela kapa li liehisa ho theoa ha foam: Li-anti-foaming agents ke li-surfactants tse phatlohang lipululana tse thehileng. Phapang pakeng tsa tse peli ke theory feela ho isa tekanyong e itseng, defoamer e atlehileng e ka boela ea thibela ho thehoa ha foam joaloka moemeli oa antifoam. Ka kakaretso, moemeli oa antifoaming o entsoe ka likarolo tse tharo tsa motheo: motsoako o sebetsang (ke hore, moemeli o sebetsang); diffusing agent (e teng kapa che); mojari.
(5) Metsi le ho qhalakanya
Lisebelisoa tsa ho kolobisa le ho qhalakanya li ka ba le mefuta e mengata ea mesebetsi, empa mesebetsi e 'meli e meholo ke ho fokotsa nako le/kapa matla a hlokahalang ho phethela ts'ebetso ea ho hasana ha ho ntse ho tsitsisa ho hasana ha mebala. Hangata li-agent le li-dispersants li arotsoe ka tse latelang
Lihlopha tse hlano:
1. Anionic wetting agent
2. cationic wetting agent
3. Electroneutral, amphoteric wetting agent
4. Moemeli oa ho kolobisa o sa sebetseng habeli, o sa nke lehlakore ka motlakase
5. Moemeli oa ho kolobisa e seng oa ionic
Mefuta e mene ea pele ea li-agent le li-dispersants li ka bapala karolo ea ho kolobisa le ho thusa ho hasana ha pigment hobane lipheletsong tsa tsona tsa hydrophilic li na le bokhoni ba ho theha maqhama a 'mele le lik'hemik'hale ka bokaholimo ba pigment, likhutlo, likhutlo, joalo-joalo, le ho ea ntlheng ea sebaka. pigment holim'a metsi, hangata ke pheletso ea hydrophobic. Li-nonionic wetting le li-dispersing agents li boetse li na le lihlopha tsa ho qetela tsa hydrophilic, empa li ke ke tsa theha maqhama a 'mele le lik'hemik'hale ka bokaholimo ba pigment, empa li ka kopana le metsi a adsorbed holim'a likaroloana tsa pigment. Metsi ana a tlamellang holim'a karoloana ea pigment ha a tsitsa 'me a lebisa ho monyeng le ho senyeha ha ionic. The desorbed surfactant tsamaisong ena ea resin ha e lefelloe 'me e atisa ho baka litla-morao tse kang ho se khonehe ha metsi.
Moemeli oa ho kolobisa le ho qhala li lokela ho eketsoa nakong ea ts'ebetso ea ho hasana ha pigment, e le ho etsa bonnete ba hore lintho tse ling tse sebetsang ka holim'a metsi li ka ba le kamano e haufi le pigment ho bapala karolo ea tsona pele li fihla holim'a karoloana ea pigment.
Tse nne. Kakaretso
Ho roala ke mokhoa o rarahaneng. E le karolo ea tsamaiso, li-additives li kenngoa ka tekanyo e nyenyane, empa li phetha karolo ea bohlokoa ts'ebetsong ea eona. Ka hona, ha ho etsoa litlolo tse thehiloeng ho solvent, e leng li-additives tse lokelang ho sebelisoa le litekanyetso tsa tsona li lokela ho khethoa ka palo e kholo ea liteko tse pheta-phetoang.
Nako ea poso: Jan-30-2023