Kodi chokhuthala mu penti yochokera m'madzi chiyenera kuwonjezeredwa bwanji?

Lero tikambirana momwe tingawonjezerere mitundu ina ya thickeners.

Mitundu ya thickeners omwe amagwiritsidwa ntchito kwambiri ndi inorganic, cellulose, acrylic, ndi polyurethane.

Zachilengedwe

Inorganic zipangizo makamaka bentonite, fumed pakachitsulo, etc., amene zambiri anawonjezera kuti slurry akupera, chifukwa n'zovuta kwathunthu kumwazikana iwo chifukwa ochiritsira utoto kusakaniza mphamvu.

Palinso gawo laling'ono lomwe lidzabalalitsidwa kale ndikukonzedwa kukhala gel kuti ligwiritsidwe ntchito.

Amatha kuwonjezeredwa ku utoto pogaya kuti apange kuchuluka kwa pre-gel. Palinso ena omwe ndi osavuta kumwazikana ndipo amatha kupangidwa kukhala gel osakaniza mothamanga kwambiri. Panthawi yokonzekera, kugwiritsa ntchito madzi ofunda kungalimbikitse njirayi.

Ma cellulose

Chogwiritsidwa ntchito kwambiri ndi cellulosichydroxyethyl cellulose (HEC). Kusayenda bwino ndi kusanja, kusakwanira kwa madzi, kukana nkhungu ndi zinthu zina, sikumagwiritsidwa ntchito kawirikawiri mu utoto wamakampani.

Akagwiritsidwa ntchito, akhoza kuwonjezeredwa mwachindunji kapena kusungunuka m'madzi pasadakhale.

Musanawonjezere, chidwi chiyenera kulipidwa pakusintha pH ya dongosolo ku zinthu zamchere, zomwe zimathandiza kuti chitukuko chake chikhale chofulumira.

Akriliki

Ma Acrylic thickeners ali ndi ntchito zina mu utoto wamafakitale. Amagwiritsidwa ntchito makamaka pazovala zodziwika bwino monga gawo limodzi ndi chiŵerengero chapamwamba cha pigment-to-base, monga mapangidwe achitsulo ndi zoyambira zotetezera.

Mu topcoat (makamaka topcoat yomveka bwino), zigawo ziwiri, varnish yophika, utoto wonyezimira kwambiri ndi machitidwe ena, ali ndi zolakwika zina ndipo sangakhale oyenerera mokwanira.

Mfundo yokulirapo ya acrylic thickener ndi: gulu la carboxyl pa unyolo wa polima limasandulika kukhala ionized carboxylate pansi pamikhalidwe yamchere, ndipo kukhuthala kumatheka chifukwa cha kuthamangitsidwa kwa electrostatic.

Choncho, pH ya dongosololi iyenera kusinthidwa kukhala alkaline musanagwiritse ntchito, ndipo pH iyeneranso kusungidwa pa> 7 panthawi yosungirako.

Ikhoza kuwonjezeredwa mwachindunji kapena kuchepetsedwa ndi madzi.

Ikhoza kusungunuka kale kuti igwiritsidwe ntchito muzinthu zina zomwe zimafuna kukhazikika kwapamwamba kwambiri. Yang'anani: choyamba chepetsani acrylic thickener ndi madzi, ndiyeno onjezerani pH chosinthira pamene mukuyambitsa. Panthawiyi, yankho limakula mwachiwonekere, kuchokera ku white milky kupita ku phala lowonekera, ndipo likhoza kusiyidwa kuti liyime kuti ligwiritsidwe ntchito mtsogolo.

Kugwiritsa ntchito njira imeneyi kumapereka mphamvu yowonjezera, koma imatha kukulitsa kukula kwa thickener kumayambiriro, zomwe zimathandiza kuti kukhazikika kwa viscosity kukhalepo pambuyo popanga utoto.

Popanga ndi kupanga H1260 madzi opangidwa ndi gawo limodzi la ufa wa siliva utoto, thickener amagwiritsidwa ntchito motere.

Polyurethane

Ma polyurethane thickeners amagwiritsidwa ntchito kwambiri mu zokutira zamafakitale ndikuchita bwino kwambiri ndipo ndi oyenera kugwiritsidwa ntchito pamakina osiyanasiyana.

Pogwiritsira ntchito, palibe chofunikira pa pH ya dongosolo, ikhoza kuwonjezeredwa mwachindunji kapena pambuyo pa dilution, kaya ndi madzi kapena zosungunulira. Ma thickeners ena ali ndi hydrophilicity osauka ndipo sangathe kuchepetsedwa ndi madzi, koma amatha kuchepetsedwa ndi zosungunulira.

emulsion system

Machitidwe a emulsion (kuphatikizapo acrylic emulsions ndi hydroxypropyl emulsions) alibe zosungunulira ndipo ndizosavuta kuzimitsa. Ndi bwino kuwonjezera iwo pambuyo dilution. Pamene diluting, malinga thickening dzuwa la thickener, kuchepetsa chiŵerengero china.

Ngati thickening dzuwa ndi otsika, dilution chiŵerengero ayenera kukhala otsika kapena osachepetsedwa; ngati thickening dzuwa ndi mkulu, dilution chiŵerengero ayenera kukhala apamwamba.

Mwachitsanzo, SV-1540 madzi opangidwa ndi polyurethane associative thickener ali ndi kukhuthala kwakukulu. Akagwiritsidwa ntchito mu emulsion system, nthawi zambiri amachepetsedwa ka 10 kapena 20 (10% kapena 5%) kuti agwiritsidwe ntchito.

Kufalikira kwa Hydroxypropyl

Hydroxypropyl dispersion resin palokha imakhala ndi zosungunulira zingapo, ndipo sizovuta kukhuthala panthawi yopanga utoto. Chifukwa chake, polyurethane nthawi zambiri imawonjezedwa mu chiŵerengero chochepa cha dilution kapena kuwonjezeredwa popanda kuchepetsedwa mumtundu wamtunduwu.

Ndikoyenera kudziwa kuti chifukwa cha chikoka cha zosungunulira zambiri, mphamvu yowonjezereka ya ma polyurethane thickeners mumtundu uwu wamtunduwu sizowoneka bwino, ndipo chowonjezera choyenera chiyenera kusankhidwa mwachindunji. Pano, ndikufuna kupangira SV-1140 madzi opangidwa ndi polyurethane associative thickener, omwe ali ndi mphamvu yowonjezereka kwambiri komanso amagwira ntchito bwino kwambiri pamakina osungunuka kwambiri.


Nthawi yotumiza: Apr-25-2024