Nhasi tichatarisa maitiro ekuwedzera mamwe marudzi emakobvu.
Mhando dzeanowanzo shandiswa thickeners ari kunyanya inorganic, cellulose, acrylic, uye polyurethane.
Inorganic
Inorganic zvinhu zvinonyanya kuve bentonite, fumed silicon, nezvimwewo, izvo zvinowanzowedzerwa kune slurry yekukuya, nekuti zvakaoma kuzviparadzira zvachose nekuda kweiyo yakajairwa pendi yekusanganisa simba.
Panewo chikamu chiduku chichave chisati chaparadzirwa uye chakagadzirirwa kuva gel kuti chishandiswe.
Vanogona kuwedzerwa kune pendi nekukuya kuita imwe chiyero chepre-gel. Kune zvakare mamwe ari nyore kuparadzira uye anogona kugadzirwa gel nekumhanyisa-kumhanyisa. Munguva yekugadzirira, kushandiswa kwemvura inodziya kunogona kukurudzira iyi nzira.
Cellulose
Iyo inonyanya kushandiswa cellulosic chigadzirwa ndeyehydroxyethyl cellulose (HEC). Kuyerera kwakashata uye kuenzana, kusakwana kwekudzivirira kwemvura, anti-mold uye zvimwe zvivakwa, haiwanzo kushandiswa mumaindasitiri pendi.
Kana ikashandiswa, inogona kuwedzerwa zvakananga kana kunyungudutswa mumvura nguva isati yasvika.
Usati wawedzera, kutarisisa kunofanirwa kubhadharwa kugadzirisa pH yehurongwa kune alkaline mamiriro, ayo anobatsira kukurumidza kukura kwayo.
Acrylic
Acrylic thickeners ane mamwe maapplication mumaindasitiri pendi. Inonyanya kushandiswa mune zvakajairwa zvakajairwa zvakajairwa senge chikamu chimwe chete uye yakakwirira pigment-to-base ratio, senge simbi zvimiro uye inodzivirira primers.
Mune topcoat (kunyanya yakajeka topcoat), maviri-chikamu, kubheka varnish, yakakwirira-gloss pendi uye mamwe masisitimu, ine zvimwe zvikanganiso uye haikwanise kunyatso kwanisa.
Iyo gobvu musimboti weiyo acrylic thickener ndeiyi: boka recarboxyl pa polymer cheni rinoshandurwa kuita ionized carboxylate pasi pemamiriro ealkaline, uye iko kukora kunowanikwa kuburikidza ne electrostatic repulsion.
Nokudaro, pH yegadziriro inofanira kugadziriswa kune alkaline isati yashandiswa, uye pH inofanirawo kuchengetedzwa pa> 7 panguva inotevera yekuchengetedza.
Inogona kuwedzerwa zvakananga kana kuderedzwa nemvura.
Inogona kunge isati yanyungudutswa kuti ishandiswe mune mamwe masisitimu ayo anoda kugadzikana kwepamusoro viscosity. Zvinonzi: tanga wanyudza iyo acrylic thickener nemvura, uye wobva wawedzera pH inogadzirisa uchikurudzira. Panguva ino, mhinduro inokora zviri pachena, kubva kuchena mukaka kusvika kune yakajeka paste, uye inogona kusiiwa kumira kuti ishandiswe gare gare.
Kushandisa nzira iyi kunopira kusimba kwekusimba, asi inogona kuwedzera zvizere thickener mukutanga nhanho, iyo inobatsira kugadzikana kweiyo viscosity mushure mekunge pendi yagadzirwa.
Mukugadzirisa nekugadzirwa kweH1260 mvura-based one-component silver powder paint, iyo thickener inoshandiswa nenzira iyi.
Polyurethane
Polyurethane thickeners anoshandiswa zvakanyanya mumaindasitiri ekukoira ane mashandiro akanaka uye akakodzera kushandiswa mune dzakasiyana masisitimu.
Mukushandisa, hapana chinodiwa pane pH yehurongwa, inogona kuwedzerwa zvakananga kana mushure mekudzikiswa, kungave nemvura kana kunyungudutsa. Mamwe makobvu ane hurombo hwe hydrophilicity uye haagone kuderedzwa nemvura, asi anogona chete kuderedzwa nezvinonyungudutsa.
emulsion system
Emulsion systems (kusanganisira acrylic emulsions uye hydroxypropyl emulsions) haina zvinonyungudutsa uye zviri nyore kukora. Zvakanakisisa kuwedzera ivo mushure me dilution. Paunenge uchidonhedza, maererano nekukora kwesimba reiyo thickener, dilue imwe chiyero.
Kana iyo thickening inobudirira yakaderera, chiyero che dilution chinofanira kunge chakaderera kana kuti chisina kuderedzwa; kana iyo thickening kunyatsoshanda kwakakwira, iyo dilution reshiyo inofanira kunge yakakwira.
Semuyenzaniso, SV-1540 mvura-based polyurethane associative thickener ine yakakwirira thickening kunyatsoshanda. Kana ichishandiswa mu emulsion system, inowanzo kuderedzwa kagumi kana makumi maviri (10% kana 5%) kuti ishandiswe.
Hydroxypropyl Dispersion
Hydroxypropyl dispersion resin pachayo ine imwe chiyero chekunyungudutsa, uye hazvisi nyore kukora panguva yekugadzira pendi. Naizvozvo, polyurethane inowanzowedzerwa mune yakaderera dilution reshiyo kana kuwedzerwa pasina dilution mumhando iyi yehurongwa.
Zvakakosha kucherechedza kuti nekuda kwesimba rehuwandu hwezvinonyungudutsa, kukora kwehuwandu hwema polyurethane thickeners mumhando iyi yegadziriro haisi pachena, uye mukobvu wakakodzera unoda kusarudzwa nenzira yakanangwa. Pano, ndinoda kukurudzira SV-1140 mvura-based polyurethane associative thickener, iyo ine yakakwirira kwazvo yekukora uye ine hunyanzvi hwekuita mumagadzirirwo epamusoro-anonyungudika.
Nguva yekutumira: Kubvumbi-25-2024