A bayyanar ingancin bugu na roba farin manne ne na waje magana na ingancin da ingancin, wanda ya hada da bayyanar jihar, fineness da fluidity na bugu na roba farin manne. Bayyanar ingancin bugu na roba mai farin manne yakamata ya zama ruwa iri ɗaya, farar ɗanɗano kaɗan, mai laushi da daidaitacce, ruwa mai kyau, kuma saman mai sheki. Duk da haka, matalauta ingancin bugu na roba farin manne sau da yawa ya Layered solidification, matalauta fluidity, flocculation da ruwa rabuwa, wuce kima danko, da kuma manna-kamar jiki a lokacin ajiya, wanda kai tsaye rinjayar da ingancin, launi, rufe ikon, ruwa juriya, leveling, Opacity. mai sheki, yawan amfanin launi da sauran kaddarorin.
Akwai abubuwa da yawa da suka shafi ingancin bayyanar bugu na roba farin manne: albarkatun kasa irin su guduro (m) wetting da dispersing wakili, thickener, filler da dabara da kuma samar da tsari zai shafi shi.
Dalilan Da Suka Shafi Ingancin Bayyanar Buga Na roba Farin Mucilage
1. Man shafawa shine abu mai samar da fim na bugu na farin manne na roba. A lokacin sinadaran polymerization dauki guduro, zafin jiki, lokaci, dauki gudun, zafi adana, stirring gudun da Bugu da kari na Additives zai haifar da bai cika sinadaran dauki da saura da yawa monomers zai haifar da matalauta sunadarai da jiki kwanciyar hankali, da guduro zai kuma coagulate da coalesce. , sakamakon delamination na bugu na roba farin manne, da karfi wari, matalauta adhesion, cibiyar sadarwa tarewa da sauran m dalilai. Sabili da haka, resin dole ne ya sami kwanciyar hankali mai kyau na sinadarai, kwanciyar hankali na ajiya, mai kyau na roba, mannewa mai karfi, laushi da halaye mara kyau.
2. Yin hukunci daga saurin lalata (Dokar Stokes)
V=218r2(P-P1)/η
A cikin dabara: Gudun faɗuwar V, ㎝/s; r-barbashi radius, ㎝;
P-pigment density barbashi, g/cm3; P1-yawan ruwa, g/cm3
Girman barbashi ruwa, 0.1pa.s
Matsakaicin saurin haɓakawa na filler yana da alaƙa da yawa tare da ƙarancin niƙa, wato, mafi girman ƙarancin niƙa, za a ninka saurin haɓakar filler. Buga na roba farin manne zai raba ruwa da flocculate a cikin yadudduka a cikin gajeren lokaci. Saboda haka, rashin lafiyar gaba ɗaya yana cikin 15-20μm. Koyaya, mafi kyawun ɓangarorin launi suna jinkirta daidaitawa kuma baya hana daidaitawa. Buga farin manne na roba wani ruwa ne mai danko wanda ba na Newtonian ruwa ba, kuma dole ne a auna dankonsa da na'urar gani mai juyi.
3. Tasirin bugu na roba farin manne Additives
A wetting da dispersing wakili a cikin bugu na roba farin mucilage iya ko'ina tarwatsa daban-daban fillers. An gabatar da hanyar sadarwa maras kyau a cikin abun da ke ciki don sanya barbashin filler su dakatar da su ba tare da lalata ba, da rage danko na slurry yadda ya kamata, da kuma hana bugu na roba fari mucilage daga flocculating. da hazo layering; Bugu da ƙari na daidaitawa yana rage haɗin kai tsakanin sarƙoƙi na macromolecular, yana rage raguwa na abubuwa kuma yana rage danko. Mai kauri yana taka muhimmiyar rawa wajen daidaita yanayin bayyanar bugu farin manne na roba.
4. Tasirin bugu na roba farin manne samar tsari
Wuce kima gudun agitator zai sa resin da za a demulsified da high karfi, da kuma rashin daidai ba kari na Additives kamar dispersants, kwarara jamiái, da thickeners kuma zai kai ga demulsification na bugu na roba roba manne da samuwar gel barbashi. Sarrafa lokaci, zafin jiki da ingancin samfur na tsarin samarwa.
Hanyar Kula da Ingancin Bayyanar Buga Farin Manne na roba
1. Zaɓi resin da ya dace da buƙatun ƙirar ƙira
Guduro shine mafi mahimmancin sashi na bugu na roba farin manne dabara. Daban-daban resins da daban-daban barbashi size rarraba, sinadaran ion kwanciyar hankali, inji kwanciyar hankali, ruwa-in-man, man-in-ruwa da hydrophilicity, wanda da babban tasiri a kan bayyanar. Sabili da haka, lokacin zabar guduro, ya zama dole don cikakken la'akari da halaye na resin kanta, musamman dacewa da guduro, don daidaita zaɓin filler da ƙari a cikin tsarin tsari.
2. Daidaita da kyau tare da mai rarrabawa da mai daidaitawa
Ma'aikata masu daidaitawa da masu rarrabawa da masana'antun daban-daban ke samarwa suna da ƙimar HLB daban-daban. Gabaɗaya, masu rarrabawa da wakilai masu daidaitawa (tushen ruwa) tare da ƙimar HLB mafi girma za su rage ɗankowar tsarin; tare da haɓaka ƙimar HLB, nau'ikan nau'ikan watsawa da masu daidaitawa za su rage dankon tsarin kuma suna shafar resin Har ila yau, ya fi girma. A hydrophilic dispersing da leveling wakili zai inganta ajiya kwanciyar hankali na bugu na roba farin manne, da hydrophobic dispersing da leveling wakili zai inganta goge juriya na bugu roba roba manne bayan fim samuwar. Saboda haka, hade da hydrophilic da hydrophobic dispersing da leveling jamiái iya yadda ya kamata inganta ajiya na bugu na roba farin manne. Idan aka ƙara tarwatsawa da daidaitawa, za a inganta yanayin ruwa da ruwa, amma saurin wankewarsa zai ragu kuma ƙarfin ruwansa zai lalace. Idan an ƙara yawan tarwatsawa da matakin daidaitawa, zai shafi ingancin bayyanarsa kai tsaye, don haka gabaɗaya yakamata a sarrafa shi tsakanin 3% -5%.
3. M selection na thickeners don inganta yi na bugu na roba farin manne
A halin yanzu, thickeners da aka saba amfani da su wajen buga roba farin manne sun hada da: polyacrylic acid, cellulose ether, alkali-soluble acrylic, da kuma non-ionic associative polyurethane.
Cellulosic thickeners (yafi ciki har da hydroxypropyl methyl cellulose, hydroxyethyl cellulose, da kuma hydroxypropyl cellulose) da high thickening yadda ya dace da kuma mai kyau kwanciyar hankali, amma matalauta matakin da sauki sa yanar gizo alamomi a allon bugu , kuma suna da wani tasiri a kan sheki na slurry. Masu kauri na polyurethane sun fi tsada kuma ba safai ake amfani da su wajen buga farin manne na roba. Polyacrylic acid thickeners suna da kyawawan matakan daidaitawa, ba su da sauƙi don samar da alamomin cibiyar sadarwa, ba sa tasiri mai sheki na slurry, suna da kyakkyawan juriya na ruwa da kwanciyar hankali na halitta, kuma suna da dacewa mai kyau, don haka an samar da haɗin gwiwar kwayoyin tsakanin kwayoyin halitta, wanda ya haifar da Resin. -filler-guduro Forms tsarin cibiyar sadarwa, samar da high matsakaici da kuma high karfi gudu, yin bugu na roba farin manne da mafi rheology, da kuma yin bayyanar Milky farin ruwa Semi-manna.
4. Yi amfani da tsarin samarwa daidai
Ya kamata a diluted mai kauri da ruwa kafin a kara. Ya kamata a fara ƙara resin, kuma dole ne a ajiye mai tayar da hankali a matsakaicin matsakaici don guje wa lalatawar guduro wanda ya haifar da tsagewa mai yawa. A lokacin aikin samarwa, ya kamata a lura da danko na slurry a kowane lokaci, kuma saurin motsawa da zafin jiki na slurry yayin samarwa ya kamata a sarrafa shi da kyau. Kuma kafin daidaita slurry, ƙara daidai adadin surfactant don kare guduro barbashi daga demulsification.
Lokacin aikawa: Maris-04-2023