Starch ether kalma ce ta gaba ɗaya na nau'in sitaci da aka gyara masu ɗauke da ether bond a cikin kwayoyin halitta, wanda kuma aka sani da sitaci etherified, wanda aka fi amfani dashi a magani, abinci, yadi, yin takarda, sinadarai na yau da kullun, man fetur da sauran masana'antu. A yau mun fi bayyana muhimmancin sitaci ether a turmi.
Gabatarwa zuwa Starch Ether
Waɗanda aka fi sani da amfani da su sune sitacin dankalin turawa, sitaci tapioca, sitaci masara, sitacin alkama, da sauransu. Idan aka kwatanta da sitacin hatsi mai yawan mai da furotin, sitacin amfanin gona kamar dankalin turawa da sitaci tapioca ya fi tsafta.
Sitaci wani fili ne na macromolecular polysaccharide wanda ya ƙunshi glucose. Akwai nau'ikan kwayoyin halitta guda biyu, masu layi da reshe, ana kiran su amylose (kimanin 20%) da amylopectin (kimanin 80%). Domin inganta kaddarorin sitaci da ake amfani da su wajen kayan gini, ana iya amfani da hanyoyin jiki da na sinadarai wajen gyara shi don sanya kadarorinsa su dace da dalilai daban-daban na kayan gini.
Etherified sitaci ya ƙunshi nau'ikan samfura daban-daban. Irin su carboxymethyl sitaci ether (CMS), hydroxypropyl sitaci ether (HPS), hydroxyethyl sitaci ether (HES), cationic sitaci ether, da dai sauransu. Yawan amfani da hydroxypropyl sitaci ether.
Matsayin hydroxypropyl sitaci ether a cikin turmi
1) Kauri turmi, ƙara anti-sagging, anti-sagging da rheological Properties na turmi.
Misali, a wajen gina tile stick, putty, da plastering turmi, musamman a yanzu da injin feshi yana buƙatar ruwa mai yawa, kamar a turmi mai tushen gypsum, yana da mahimmanci musamman (gypsum ɗin da aka fesa na'ura yana buƙatar ruwa mai yawa amma zai haifar da sagging mai tsanani). , sitaci Ether zai iya gyara wannan rashi).
Ruwan ruwa da juriya na sag sau da yawa suna cin karo da juna, kuma ƙara yawan ruwa zai haifar da raguwar juriya na sag. Turmi tare da rheological Properties na iya da kyau warware irin wannan sabani, wato, a lokacin da wani waje karfi da ake amfani, da danko ragewa, inganta workability da pumpability, da kuma lokacin da waje karfi da aka janye, da danko ƙara da sagging juriya da aka inganta.
Don yanayin haɓaka yankin tayal na yanzu, ƙara ether sitaci na iya haɓaka juriya na zamewar talle.
2) Tsawaita lokutan budewa
Don mannen tayal, yana iya biyan buƙatun mannen tayal na musamman (Class E, 20min da aka tsawaita zuwa 30min don isa 0.5MPa) waɗanda ke tsawaita lokacin buɗewa.
Ingantattun kaddarorin saman
Sitaci ether zai iya sa saman gypsum tushe da siminti turmi santsi, mai sauƙin amfani, kuma yana da kyakkyawan sakamako na ado. Yana da matukar ma'ana ga plastering turmi da kuma bakin ciki Layer na ado turmi kamar putty.
Mechanism na aikin hydroxypropyl sitaci ether
Lokacin da sitaci ether ya narke a cikin ruwa, za a tarwatsa shi daidai a cikin tsarin turmi na siminti. Tun da sitaci ether molecule yana da tsarin cibiyar sadarwa kuma ana cajin shi mara kyau, zai shafe ƙwayoyin siminti da aka caje da kyau kuma ya zama gadar canji don haɗa siminti, don haka ba da ƙimar yawan amfanin ƙasa na slurry na iya inganta anti-sag ko anti-slip. tasiri.
Bambanci tsakanin hydroxypropyl sitaci ether da cellulose ether
1. Sitaci ether iya yadda ya kamata inganta anti-sag da anti-slip Properties na turmi
Cellulose ether yawanci kawai zai iya inganta danko da riƙewar ruwa na tsarin amma ba zai iya inganta abubuwan da ba su da kyau da kuma abubuwan da suka dace.
2. Kauri da danko
Gabaɗaya, danko na ether cellulose yana da kusan dubun dubunnan, yayin da ɗankowar sitaci ether ya kai ɗaruruwan ɗari zuwa dubu da yawa, amma wannan ba yana nufin cewa sitaci ether yana da ƙaƙƙarfan kadarorin iska ba, yayin da sitaci ether ba shi da mallakar iska. .
5. Tsarin kwayoyin halitta na ether cellulose
Ko da yake duka sitaci da cellulose sun ƙunshi ƙwayoyin glucose, hanyoyin haɗin su sun bambanta. Matsakaicin dukkan kwayoyin glucose a cikin sitaci iri ɗaya ne, yayin da na cellulose akasin haka ne, kuma yanayin kowane ƙwayar glucose na kusa ya saba. Wannan bambance-bambancen tsarin kuma yana ƙayyade bambanci a cikin kaddarorin cellulose da sitaci.
Lokacin aikawa: Afrilu-10-2023