Thickener wani nau'in ƙari ne na musamman na rheological, babban aikinsa shine ƙara danko na ruwan fenti, haɓaka aikin ajiya, aikin gini da tasirin fim ɗin fenti.
Matsayin thickeners a cikin sutura
kauri
Anti-kwance
Mai hana ruwa ruwa
Anti-sagging
Anti raguwa
Inganta watsawa yadda ya dace
Inganta aikin gini
Ƙara kaurin fim ɗin fenti
Inganta tasirin saman
Halaye na daban-daban thickeners
1. Inorganic thickener
Mafi yawan amfani da kwayoyin bentonite, wanda babban sashinsa shine montmorillonite.Tsarinsa na musamman na lamellar zai iya ba da shafi tare da pseudoplasticity mai ƙarfi, thixotropy, kwanciyar hankali na dakatarwa da lubricity.Ka'idar yin kauri shine cewa foda yana sha ruwa kuma ya kumbura don yin kauri, don haka yana da takamaiman ruwa.
Lalacewar su ne: ƙarancin kwarara da aikin daidaitawa, ba sauƙin tarwatsawa da ƙarawa ba.
2. Cellulose ether
Mafi yawan amfani shinehydroxyethyl cellulose(HEC), wanda ke da babban kauri yadda ya dace, kyakkyawan dakatarwa, tarwatsawa da kaddarorin riƙe ruwa, galibi don kauri lokacin ruwa.
Rashin hasara shine: rinjayar juriya na ruwa na rufi, rashin isasshen aikin anti-mold, da rashin aiki mara kyau.
3. Acrylic
Acrylic thickeners gaba ɗaya sun kasu kashi biyu: acrylic alkali-swellable thickeners (ASE) da associative alkali-swellable thickeners (HASE).
The thickening ka'idar acrylic acid alkali-swellable thickener (ASE) shi ne ya dissociate da carboxylate lokacin da pH aka gyara zuwa alkaline, sabõda haka, da kwayoyin sarkar da aka miƙa daga wani helical zuwa sanda ta hanyar jima'i electrostatic repulsion tsakanin carboxylate ions. , inganta The danko na ruwa lokaci.Wannan nau'in thickener kuma yana da inganci mai girma, mai ƙarfi pseudoplasticity da kuma dakatarwa mai kyau.
A associative alkali-swellable thickener (HASE) gabatar hydrophobic kungiyoyin a kan talakawa alkali-swellable thickeners (ASE).Hakazalika, lokacin da aka daidaita pH zuwa alkaline, jima'i na electrostatic repusion tsakanin ions carboxylate ya sa Sarkar kwayoyin halitta ta tashi daga siffar helical zuwa siffar sanda, wanda ya kara danko na lokaci na ruwa;kuma ƙungiyoyin hydrophobic da aka gabatar akan babban sarkar na iya haɗawa da ƙwayoyin latex don ƙara danko na lokaci na emulsion.
Rashin hasara shine: kula da pH, rashin isasshen ruwa da daidaita fim ɗin fenti, mai sauƙin ɗauka bayan.
4. Polyurethane
Polyurethane associative thickener (HEUR) wani hydrophobically modified ethoxylated polyurethane ruwa mai narkewa polymer polymer, wanda nasa wadanda ba ionic associative thickener.Ya ƙunshi sassa uku: hydrophobic tushe, hydrophilic sarkar da polyurethane tushe.Tushen polyurethane yana faɗaɗa a cikin maganin fenti, kuma sarkar hydrophilic tana da ƙarfi a cikin yanayin ruwa.Tushen hydrophobic yana haɗuwa da tsarin hydrophobic kamar ƙwayoyin latex, surfactants, da pigments., Samar da tsarin cibiyar sadarwa mai girma uku, don cimma manufar kauri.
An halin da thickening na emulsion lokaci, m kwarara da matakin yi, mai kyau thickening yadda ya dace da kuma mafi barga danko ajiya, kuma babu pH iyaka;kuma yana da fa'ida a bayyane a cikin juriya na ruwa, mai sheki, nuna gaskiya, da dai sauransu.
Rashin hasara shine: a cikin tsarin matsakaici da ƙananan danko, tasirin anti-settinging akan foda ba shi da kyau, kuma ana samun sauƙin tasiri ta hanyar rarrabawa da kaushi.
Lokacin aikawa: Dec-12-2022