labarai

Kamar yadda danko na tushen ruwa ya ragu sosai, ba zai iya biyan bukatun ajiya da aikin ginin rufi ba, don haka ya zama dole a yi amfani da thickener mai dacewa don daidaita danko na rufin ruwa zuwa daidai yanayin.

Akwai nau'ikan thickeners da yawa.Lokacin zabar thickeners, ban da su thickening yadda ya dace da kuma kula da shafi rheology, wasu wasu dalilai ya kamata a yi la'akari da su sa rufi da mafi kyau yi yi yi, mafi kyau shafi bayyanar fim da kuma mafi tsawo sabis rayuwa.

Zaɓin nau'in mai kauri ya dogara ne akan buƙatu da ainihin halin da ake ciki.

Lokacin zabar da amfani da thickeners, waɗannan suna da mahimmanci.

1. High kwayoyin nauyi HEC yana da mafi girma digiri na entanglement idan aka kwatanta da low kwayoyin nauyi da kuma nuna mafi girma thickening yadda ya dace a lokacin ajiya.Kuma lokacin da adadin shear ya karu, yanayin iska ya lalace, mafi girman girman juzu'i, ƙananan tasirin kwayoyin halitta akan danko.Wannan thickening inji ba shi da wani dangantaka da tushe abu, pigments da Additives amfani, kawai bukatar zabi da hakkin kwayoyin nauyi na cellulose da daidaita taro na thickener iya samun dama danko, kuma ta haka ne yadu amfani.

2.HEUR thickener ne mai danko mai ruwa-ruwa bayani tare da diol ko diol ether a matsayin co-solvent, tare da m abun ciki na 20% ~ 40%.Matsayin haɗin haɗin gwiwa shine hana mannewa, in ba haka ba irin waɗannan masu kauri suna cikin yanayin gel a daidai wannan taro.A lokaci guda, kasancewar sauran ƙarfi zai iya guje wa samfurin daga daskarewa, amma dole ne a dumi shi a cikin hunturu kafin amfani.

3. Ƙananan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan samfurori suna da sauƙin zubar da su kuma ana iya jigilar su da adana su cikin girma.Don haka, wasu masu kauri HEUR suna da ƙaƙƙarfan abun ciki daban-daban na wadatar samfur iri ɗaya.Abubuwan da ke da ƙarfi na ƙananan ƙwararrun ƙwanƙwasa sun fi girma, kuma tsaka-tsakin tsaka-tsakin fenti zai ɗan ragu kaɗan lokacin da aka yi amfani da shi, wanda za a iya kashe shi ta hanyar rage haɗin gwiwar da aka ƙara a wani wuri a cikin tsari.

4. A ƙarƙashin yanayin haɗuwa masu dacewa, ana iya ƙara ƙarancin danko HEUR kai tsaye zuwa fenti na latex.Lokacin amfani da samfuran danko mai girma, mai kauri yana buƙatar a tsoma shi tare da cakuda ruwa da haɗakarwa kafin a iya ƙarawa.Idan kun ƙara ruwa don tsoma mai kauri kai tsaye, zai rage yawan haɗin haɗin gwiwa na asali a cikin samfurin, wanda zai ƙara mannewa kuma ya sa danko ya tashi.

5. Ƙara thickener zuwa tanki mai haɗawa ya kamata ya zama tsayayye da jinkirin, kuma ya kamata a saka shi tare da tankin bango.Bai kamata saurin ƙarawa ya yi sauri ta yadda mai kauri ya tsaya a saman ruwan ba, sai a ja shi a cikin ruwan a jujjuya shi a kusa da ramin da yake motsawa, idan ba haka ba za a gauraya mai kauri sosai ko kuma mai kauri ya yi kauri da yawa. ko flocculated saboda babban taro na gida.

6. HEUR thickener aka kara zuwa Paint hadawa tank bayan sauran ruwa aka gyara da kuma kafin emulsion, don tabbatar da iyakar mai sheki.

7. HASE thickeners suna kara kai tsaye zuwa fenti a cikin nau'i na emulsion a cikin samar da emulsion fenti ba tare da dilution kafin ko pre-neutralization.Ana iya ƙara shi azaman sashi na ƙarshe a cikin lokacin haɗawa, a cikin lokacin watsawar pigment, ko azaman farkon ɓangaren hadawa.

8. Tunda HASE emulsion ne mai yawan acid, bayan an hada, idan akwai alkali a cikin fentin emulsion, zai yi takara da wannan alkali.Sabili da haka, ana buƙatar ƙara emulsion na HASE thickener sannu a hankali kuma a hankali, kuma yana motsawa da kyau, in ba haka ba, zai sa tsarin watsawa na pigment ko emulsion daure rashin zaman lafiya na gida, kuma ƙarshen yana daidaitawa ta hanyar ƙungiyar tsaka-tsaki.

9. Za a iya ƙara alkaki kafin ko bayan an ƙara abin da zai yi kauri.Amfanin ƙara kafin shi ne don tabbatar da cewa babu wani gida rashin zaman lafiya na pigment watsawa ko emulsion daure da za a lalacewa ta hanyar thickener grabbing alkali daga saman pigment ko daure.Amfanin ƙara alkali bayan haka shi ne cewa abubuwan da ke daɗaɗɗa suna tarwatsewa da kyau kafin su kumbura ko narkar da su ta hanyar alkali, suna hana kauri na gida ko haɓakawa, dangane da tsari, kayan aiki da tsarin masana'antu.Hanya mafi aminci ita ce a tsoma mai kauri na HASE da ruwa da farko sannan a cire shi da alkali a gaba.

10. HASE thickener fara kumbura a pH na game da 6, da thickening yadda ya dace ya zo cikin cikakken wasa a pH na 7 zuwa 8. Daidaita pH na latex fenti zuwa sama 8 zai iya kiyaye pH na latex fenti daga raguwa a kasa 8. , don haka tabbatar da kwanciyar hankali na danko.