Starch ether ke lentsoe le akaretsang bakeng sa sehlopha sa li-starch tse fetotsoeng tse nang le li-bond tsa ether ka molek'hule, tse tsejoang hape e le starch ea etherified, e sebelisoang haholo meriana, lijo, masela, ho etsa pampiri, lik'hemik'hale tsa letsatsi le letsatsi, peterole le liindasteri tse ling. Kajeno re hlalosa haholo-holo karolo ea starch ether ka seretse.
Selelekela ho Starch Ether
Tse tloaelehileng haholo le tse sebelisoang hangata ke tapi ea litapole, tapioca starch, corn starch, starch ea koro, joalo-joalo. Ha e bapisoa le cereal starch e nang le mafura a mangata le protheine, motso oa setache se kang litapole le tapioca starch e hloekile haholoanyane.
Starch ke motsoako oa polysaccharide macromolecular o entsoeng ka tsoekere. Ho na le mefuta e 'meli ea limolek'hule, linear le branched, tse bitsoang amylose (hoo e ka bang 20%) le amylopectin (hoo e ka bang 80%). E le ho ntlafatsa thepa ea starch e sebelisoang ka thepa ea mohaho, mekhoa ea 'mele le ea lik'hemik'hale e ka sebelisoa ho e fetola ho etsa hore thepa ea eona e be e loketseng merero e fapaneng ea thepa ea mohaho.
Etherified starch e kenyelletsa mefuta e fapaneng ea lihlahisoa. Tse kang carboxymethyl starch ether (CMS), hydroxypropyl starch ether (HPS), hydroxyethyl starch ether (HES), cationic starch ether, joalo-joalo E atisa ho sebelisoa hydroxypropyl starch ether.
Karolo ea hydroxypropyl starch ether ka seretseng
1) Thibela seretse, eketsa anti-sagging, anti-sagging le thepa ea rheological ea seretse.
Mohlala, kahong ea sekhomaretsi sa lithaele, putty, le seretse sa plaster, haholo joale kaha ho fafatsa ka mochini ho hloka metsi a mangata, joalo ka seretse se thehiloeng ho gypsum, ho bohlokoa haholo (gypsum e fafalitsoeng ka mochini e hloka metsi a mangata empa e tla baka ho putlama ho hoholo. , starch Ether e ka etsa hore ho be le khaello ena).
Fluidity le sag resistance hangata lia hanyetsana, 'me ho eketseha ha mokelikeli ho tla lebisa ho fokotseha ha khanyetso ea sag. Seretse se nang le thepa ea rheological se ka rarolla khanyetsano e joalo hantle, ke hore, ha matla a kantle a sebelisoa, viscosity e ea fokotseha, e ntlafatsa ts'ebetso le ho pompa, 'me ha matla a kantle a tlosoa, viscosity ea eketseha le ho hanyetsa ho fokotseha hoa ntlafatsoa.
Bakeng sa mokhoa oa hona joale oa ho eketsa sebaka sa lithaele, ho eketsa starch ether ho ka ntlafatsa ho hanyetsa ho thella ha sekhomaretsi sa lithaele.
2) Lihora tsa ho bula tse atolositsoeng
Bakeng sa li-adhesives tsa lithaele, e ka finyella litlhoko tsa li-adhesives tse khethehileng tsa lithaele (Sehlopha sa E, 20min e atolositsoeng ho 30min ho fihlela 0.5MPa) e eketsang nako ea ho bula.
Lintho tse ntlafetseng tsa bokaholimo
Starch ether e ka etsa hore bokaholimo ba seretse sa gypsum le seretse sa samente bo be boreleli, bo be bonolo ho sebelisoa, 'me bo na le phello e ntle ea mokhabiso. E bohlokoa haholo bakeng sa ho pola seretse le seretse se tšesaane se khabisitsoeng joalo ka putty.
Mokhoa oa ts'ebetso oa hydroxypropyl starch ether
Ha starch ether e qhibiliha ka metsing, e tla qhalakanngoa ka mokhoa o ts'oanang tsamaisong ea seretse sa samente. Kaha molek'hule ea starch ether e na le mohaho oa marang-rang 'me e qosoa hampe, e tla monya likaroloana tsa samente tse nang le thepa e ntle' me e sebetse e le borokho ba phetoho ea ho kopanya samente, kahoo e fane ka boleng bo boholo ba tlhahiso ea slurry e ka ntlafatsang anti-sag kapa anti-slip. phello.
Phapang lipakeng tsa hydroxypropyl starch ether le cellulose ether
1. Starch ether e ka ntlafatsa ka katleho thepa ea seretse se khahlanong le sag le e khahlanong le ho thella
Cellulose ether hangata e ka ntlafatsa viscosity le ho boloka metsi a sistimi empa e ke ke ea ntlafatsa thepa ea anti-sagging le anti-slip.
2. Thickening le viscosity
Ka kakaretso, viscosity ea cellulose ether e ka bang mashome a likete, ha viscosity ea starch ether e le makholo a 'maloa ho isa ho likete tse' maloa, empa sena ha se bolele hore starch ether e na le thepa e matla ea ho kenya moea, ha starch ether e se na thepa ea ho kenya moea. .
5. Sebopeho sa limolek'hule tsa cellulose ether
Leha ka bobeli starch le cellulose li entsoe ka limolek'hule tsa tsoekere, mekhoa ea tsona ea sebopeho e fapane. Limolek'hule tsohle tsa tsoekere ho starch lia tšoana, athe selulose ke se fapaneng, 'me chebahalo ea molek'hule e' ngoe le e 'ngoe e haufi ea glucose e fapane. Phapang ena ea sebopeho e boetse e etsa qeto ea phapang ea thepa ea selulose le starch.
Nako ea poso: Apr-10-2023