Thickener ke motsoako o tloaelehileng le o sebelisoang ka ho fetisisa oa metsi ka har'a litlolo tse entsoeng ka metsi.Ka mor'a ho eketsa thickener, e ka eketsa viscosity ea tsamaiso ea ho roala, ka tsela eo e thibela lintho tse batlang li teteana ka har'a seaparo hore li se ke tsa lula.Ha ho na ho ba le ts'ebetso e sisinyehang ka lebaka la viscosity ea pente e le tšesaane haholo.Ho na le mefuta e mengata ea lihlahisoa tse teteaneng, 'me mefuta e sa tšoaneng ea lihlahisoa e na le melao-motheo e fapaneng ea ho tiisa bakeng sa mekhoa e fapaneng ea ho roala.Ho na le hoo e ka bang mefuta e mene ea li-thickeners tse tloaelehileng: polyurethane thickeners, acrylic thickeners, inorganic thickeners le thickeners bakeng sa cellulose thickeners.
1. Thickening mochine oa associative polyurethane thickener
Litšobotsi tsa sebopeho sa polyurethane associative thickeners ke lipophilic, hydrophilic le lipophilic tri-block polymers, tse nang le lihlopha tsa ho qetela tsa lipophilic lipheletsong ka bobeli, hangata lihlopha tsa aliphatic hydrocarbon, le karolo ea polyethylene glycol e qhibilihang ka metsi bohareng.Hafeela ho ntse ho e-na le tekanyo e lekaneng ea "thickener" tsamaisong, tsamaiso e tla theha sebopeho sa marang-rang ka kakaretso.
Tsamaisong ea metsi, ha motsoako oa "thickener" o le moholo ho feta oa mahloriso a mahlonoko a micelle, lihlopha tsa ho qetela tsa lipophilic li amahanngoa le ho etsa li-micelles, 'me motenya o etsa sebopeho sa marang-rang ka mokhatlo oa li-micelles ho eketsa viscosity ea tsamaiso.
Ho latex system, thickener e ke ke ea theha mokhatlo feela ka lipophilic terminal group micelles, empa ho bohlokoa le ho feta, sehlopha sa lipophilic terminal sa thickener se adsorbed ka holim'a karoloana ea latex.Ha lihlopha tse peli tsa lipophilic qetellong li adsorbed holim'a likaroloana tse fapaneng tsa latex, limolek'hule tse teteaneng li etsa marokho pakeng tsa likaroloana.
2. Thickening mochine oa polyacrylic acid alkali ho ruruha thickener
Polyacrylic acid alkali swelling thickener ke cross-linked copolymer emulsion, copolymer e teng ka sebōpeho sa acid le likaroloana tse nyenyane haholo, ponahalo e tšoeu ea lebese, viscosity e batla e le tlaase, 'me e na le botsitso bo botle ka pH ea thobalano e tlaase,' me e sa qhibilihe. ka metsing.Ha alkaline e eketsoa, e fetoha ho hasana ho hlakileng le ho ruruha haholo.
Tšusumetso e matla ea polyacrylic acid alkali ho ruruha thickener e hlahisoa ka ho fokotsa sehlopha sa carboxylic acid ka hydroxide;ha ho eketsoa moemeli oa alkali, sehlopha sa carboxylic acid se sa ionized habonolo se fetoloa hang-hang hore e be ionized ammonium carboxylate kapa tšepe Ka mokhoa oa letsoai, phello ea electrostatic repulsion e hlahisoa hammoho le setsi sa anion sa ketane ea copolymer macromolecular, e le hore sefapano se be teng. -e kopantsoeng le ketane ea copolymer macromolecular e atoloha mme e otlolla ka potlako.Ka lebaka la ho qhibiliha le ho ruruha ha sebaka seo, karoloana ea pele e atisa ka makhetlo a mangata 'me viscosity e eketseha haholo.Kaha li-crosslink ha li khone ho qhibiliha, copolymer ka mokhoa oa letsoai e ka nkoa e le ho qhalakanngoa ha copolymer eo likaroloana tsa eona li atolositsoeng haholo.
Li-thickeners tsa polyacrylic acid li na le phello e ntle ea ho teteana, lebelo le teteaneng ka potlako, le botsitso bo botle ba likokoana-hloko, empa li na le maikutlo a pH, ho fokola ha metsi, le khanya e tlaase.
3. Thickening mochine oa inorganic thickeners
Li-inorganic thickeners haholo-holo li kenyelletsa bentonite e fetotsoeng, attapulgite, joalo-joalo Li-thickeners tsa Inorganic li na le melemo ea ho teteka ka matla, thixotropy e ntle, mefuta e mengata ea pH, le botsitso bo botle.Leha ho le joalo, kaha bentonite ke phofo e sa tloaelehang e nang le khanya e ntle ea leseli, e ka fokotsa haholo khanya ea holim'a filimi ea ho roala le ho sebetsa joaloka moemeli oa matting.Ka hona, ha u sebelisa bentonite ka pente e benyang ea latex, tlhokomelo e lokela ho lefshoa ho laola litekanyetso.Nanotechnology e hlokometse nanoscale ea likaroloana tsa inorganic, hape e file li-inorganic thickeners ka thepa e ncha.
Mokhoa o motenya oa li-thickeners tsa inorganic o batla o rarahane.Ka kakaretso ho lumeloa hore ho nyenyefatsa pakeng tsa litefiso tsa ka hare ho eketsa viscosity ea pente.Ka lebaka la boemo ba eona bo bobe, bo ama khanya le pepeneneng ea filimi ea pente.Hangata e sebelisoa bakeng sa Primer kapa pente e phahameng.
4. Thickening mochine oa cellulose thickener
Li-cellulose thickeners li na le histori e telele ea tsoelo-pele 'me li boetse li sebelisoa haholo ke li-thickeners.Ho ea ka sebopeho sa bona sa limolek'hule, li arotsoe ka hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, joalo-joalo, e sebelisoang haholo hydroxyethyl cellulose (HEC).
The thickening mochine oa cellulose thickener ke haholo-holo ho sebelisa ketane e kholo ea hydrophobic ka sebopeho sa eona ho theha likamano tsa haedrojene ka metsi, 'me ka nako e ts'oanang li sebelisana le lihlopha tse ling tsa polar ka sebopeho sa eona ho haha mohaho oa marang-rang a mararo le ho eketsa molumo oa rheological. ea polymer., thibela sebaka sa ho tsamaea ka bolokolohi sa polymer, kahoo ho eketsa viscosity ea ho roala.Ha matla a ho kuta a sebelisoa, mohaho oa marang-rang a mararo o senngoa, maqhama a hydrogen pakeng tsa limolek'hule a nyamela, 'me viscosity e fokotseha.Ha matla a ho kuta a tlosoa, maqhama a haedrojene a thehoa hape, 'me mohaho oa marang-rang o nang le likarolo tse tharo o tsosolosoa, kahoo o etsa bonnete ba hore ho roala ho ka ba le thepa e ntle.litšobotsi tsa rheological.
Li-cellulosic thickeners li ruile ka lihlopha tsa hydroxyl le likarolo tsa hydrophobic ka sebopeho sa tsona.Li na le ts'ebetso e phahameng ea botenya 'me ha li nahanele pH.Leha ho le joalo, ka lebaka la ho hanyetsa ha bona metsi a fokolang le ho ama boemo ba filimi ea pente, ba bonolo Ho angoa ke ho senyeha ha likokoana-hloko le mefokolo e meng, li-cellulose thickeners li hlile li sebelisoa haholo-holo bakeng sa ho tiisa lipente tsa latex.
Nakong ea ho lokisoa ha ho roala, khetho ea "thickener" e lokela ho nahanisisa ka lintlha tse ngata, tse kang ho lumellana le tsamaiso, viscosity, botsitso ba polokelo, ts'ebetso ea kaho, litšenyehelo le lintlha tse ling.Li-thickeners tse ngata li ka kopanngoa le ho sebelisoa ho fana ka papali e feletseng ho melemo ea "thickener" e 'ngoe le e' ngoe, 'me ka mokhoa o utloahalang ho laola litšenyehelo tlas'a boemo ba ts'ebetso e khotsofatsang.
Nako ea poso: Mar-02-2023