Etherified starch ke starch substituent ether e entsoeng ke karabelo ea lihlopha tsa hydroxyl ka limolek'hule tsa starch tse nang le lintho tse sebetsang, ho kenyelletsa hydroxyalkyl starch, carboxymethyl starch le cationic starch. Kaha etherification ea starch e ntlafatsa botsitso ba viscosity le bond ether ha e bonolo ho hydrolyzed tlas'a maemo a matla a alkaline, starch ea etherified e sebelisoa masimong a mangata a indasteri. Carboxymethyl starch (CMS) ke mofuta o kentsoeng oa lihlahisoa tsa tlhaho tsa anionic le polymer polyelectrolyte ether ea tlhaho e qhibilihang metsing a batang. Hajoale, cMS e se e sebelisoa haholo indastering ea lijo, meriana, petroleum, lik'hemik'hale tsa letsatsi le letsatsi, masela, ho etsa pampiri, likhomaretsi le liindasteri tsa pente. the
Ka indasteri ea lijo, CMS ha e na chefo ebile ha e kotsi 'meleng oa motho ebile e ka sebelisoa e le ntlafatso ea boleng. Sehlahisoa se phethiloeng se na le sebōpeho se setle haholo, 'mala le tatso, e etsa hore e be boreleli, e teteaneng le e hlakileng; CMS e ka boela ea sebelisoa e le se bolokang lijo. Indastering ea meriana, CMS e sebelisoa e le disintegrant tablet, plasma volume expander, thickener bakeng sa litokisetso tsa mofuta oa likuku le dispersant ea lithethefatsi bakeng sa molomo oa suspoemulsion. CMS e sebelisoa haholo indastering ea oli e le sesebelisoa se fokotsang tahlehelo ea mokelikeli oa seretse. E na le khanyetso ea letsoai, e khona ho hanyetsa letsoai ho ea ho tlala, 'me e na le liphello tse khahlanong le ho theoha le bokhoni bo itseng ba ho thibela calcium. Ke sesebelisoa sa boleng bo holimo se fokotsang tahlehelo ea mokelikeli. Leha ho le joalo, ka lebaka la ho hanyetsa mocheso o fokolang, e ka sebelisoa feela lits'ebetsong tse sa tebang tsa liliba. CMS e sebelisoa bakeng sa boholo ba likhoele tse bobebe, 'me e na le litšobotsi tsa ho hasana ka potlako, thepa e ntle ea ho etsa lifilimi, filimi ea boholo bo bonolo, le ho khetha habonolo. CMS e ka boela ea sebelisoa e le tackifier le modifier mefuteng e fapaneng ea khatiso le ea ho daea. CMS e sebelisoa e le sekhomaretsi ka ho roala pampiri, se ka etsang hore seaparo se be le boemo bo botle le botsitso ba viscosity. Lintho tsa eona tsa ho boloka metsi li laola ho kenella ha sekhomaretsi ka har'a setsi sa pampiri, ho fa pampiri e koahetsoeng thepa e ntle ea khatiso. Ho phaella moo, CMS ka boela sebelisoa e le viscosity reducer bakeng sa mashala slurry le oli-mashala tsoakiloeng mafura slurry, e le hore e na le e ntle fanyeha emulsion botsitso le fluidity. E ka boela ea sebelisoa e le sekontiri bakeng sa pente ea latex e thehiloeng metsing, sesebelisoa sa chelating bakeng sa ho hloekisa likhoerekhoere tse matla, le se hloekisang letlalo ka litlolo. Lintho tsa eona tsa 'mele ke tse latelang:
PH boleng: Alkaline (5% aqueous solution) Solubility: E ka qhibiliha ka metsing a batang Bokhabane: Ka tlase ho 500μm Viscosity: 400-1200mpas (5% aqueous solution) Ho lumellana le lisebelisoa tse ling: E ntle le lisebelisoa tse ling tsa mohaho.
1. Mosebetsi o ka sehloohong
Bokhoni bo botle haholo ba ho tiisa ka potlako: viscosity e bohareng, ho boloka metsi a phahameng;
Tekanyo e nyane, mme tekanyo e tlase haholo e ka fihlela phello e phahameng;
Ntlafatsa bokhoni ba anti-sag ba thepa ka boeona;
E na le lubricity e ntle, e ka ntlafatsang ts'ebetso ea lisebelisoa le ho etsa hore ts'ebetso e be bonolo. the
2. bophara ba tšebeliso
Starch ether e loketse mefuta eohle ea (samente, gypsum, lime-calcium) kahare le bokantle ba lebota la putty, le mefuta eohle ea seretse se shebaneng le seretse sa plaster. Tekanyo e khothalletsoang: 0.05% -0.15% (e lekantsoe ka lithane), tšebeliso e khethehileng e itšetlehile ka karolelano ea sebele. E ka sebelisoa e le motsoako oa lihlahisoa tse thehiloeng ho samente, lihlahisoa tse thehiloeng ho gypsum le lihlahisoa tsa lime-calcium. Starch ether e lumellana hantle le meaho e meng le li-admixtures; e loketse ka ho khetheha bakeng sa ho haha metsoako e omileng e kang seretse, li-adhesives, plastering le lisebelisoa tsa ho roala. Li-starch ethers le methyl cellulose ethers (Limaraka tsa Tylose MC) li sebelisoa hammoho kahong ea metsoako e omileng ho fana ka matla a holimo, sebopeho se matla, ho hanyetsa le ho ts'oaroa habonolo. The viscosity ea seretse, likhomaretsi, plasters le roll renders tse nang le methyl cellulose ethers e phahameng e ka fokotsoa ka ho eketsoa ha starch ethers. the
3. Sehlopha sa li-ethers tsa starch
Li-ether tsa starch tse sebelisoang liretseng li fetotsoe ho tsoa ho li-polymer tsa tlhaho tsa li-polysaccharides tse ling. Tse kang litapole, poone, cassava, guar beans joalo-joalo. the
Kakaretso e fetotsoeng starch
Starch ether e fetotsoeng ho tloha ho litapole, poone, cassava, joalo-joalo e na le polokelo ea metsi e tlase haholo ho feta cellulose ether. Ka lebaka la tekanyo e fapaneng ea phetoho, botsitso ba acid le alkali bo fapane. Lihlahisoa tse ling li loketse ho sebelisoa liretseng tse thehiloeng ho gypsum, ha tse ling li ka sebelisoa liretseng tse entsoeng ka samente. Ho sebelisoa ha starch ether ka har'a seretse e sebelisoa haholo-holo e le motenya ho ntlafatsa thepa e thibelang ho senyeha ha seretse, ho fokotsa ho khomarela seretse se metsi, le ho lelefatsa nako ea ho bula. Hangata li-starch ethers li sebelisoa hammoho le selulose, e le hore thepa le melemo ea lihlahisoa tsena tse peli li tlatsana. Kaha lihlahisoa tsa starch ether li theko e tlaase haholo ho feta cellulose ether, ho sebelisoa ha starch ether ka seretse ho tla tlisa phokotso e kholo ea litšenyehelo tsa ho etsoa ha seretse. the
guare ether
Guar gum ether ke mofuta oa starch ether e nang le thepa e khethehileng, e fetotsoeng ho tloha linaoa tsa tlhaho tsa guar. Haholo-holo ka karabelo ea etherification ea guar gum le sehlopha se sebetsang sa acrylic, sebopeho se nang le 2-hydroxypropyl sehlopha se sebetsang se thehoa, e leng sebopeho sa polygalactomannose.
(1) Ha e bapisoa le cellulose ether, guar gum ether e qhibiliha haholoanyane metsing. Boleng ba pH ha e le hantle ha bo na phello tšebetsong ea li-guar ethers. the
(2) Tlas'a maemo a viscosity e tlase le tekanyo e tlase, guar gum e ka nka sebaka sa cellulose ether ka tekanyo e lekanang, 'me e na le ho boloka metsi ho tšoanang. Empa ho hlaka ho ntlafala, anti-sag, thixotropy joalo-joalo. (3) Tlas'a maemo a viscosity e phahameng le tekanyo e phahameng, guar gum e ke ke ea nkela cellulose ether sebaka, 'me tšebeliso e tsoakiloeng ea tse peli e tla hlahisa ts'ebetso e ntle.
(4) Ho sebelisoa ha guar gum ka seretse se thehiloeng ho gypsum ho ka fokotsa haholo ho khomarela nakong ea kaho le ho etsa hore mohaho o be bonolo. Ha e na phello e mpe nakong ea ho beha nako le matla a seretse sa gypsum. the
(5) Ha guar gum e sebelisoa ka samente e entsoeng ka masonry le seretse sa plastering, e ka nka sebaka sa cellulose ether ka tekanyo e lekanang, 'me ea etsa hore seretse se be le khanyetso e ntle, thixotropy le boreleli ba kaho. the
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(7) Kaha theko ea guar gum e tlase haholo ho feta ea cellulose ether, tšebeliso ea guar gum ka seretse se tla fokotsa haholo litšenyehelo tsa tlhahiso ea sehlahisoa. the
Setenya se fetotsoeng sa ho boloka metsi a liminerale
Setsi se bolokang metsi se entsoeng ka liminerale tsa tlhaho ka ho fetola le ho kopanya se sebelisitsoe Chaena. Liminerale tse ka sehloohong tse sebelisetsoang ho lokisa li-thickeners tse bolokang metsi ke: sepiolite, bentonite, montmorillonite, kaolin, joalo-joalo Liminerale tsena li na le thepa e itseng ea ho boloka metsi le ho teteaneng ka ho fetola joalo ka li-coupling agents. Mofuta ona oa botenya o bolokang metsi o sebelisoang seretseng o na le litšobotsi tse latelang. the
(1) E ka ntlafatsa haholo ts'ebetso ea seretse se tloaelehileng, 'me ea rarolla mathata a ho se sebetse hantle ha seretse sa samente, matla a tlase a seretse se tsoakiloeng, le ho se sebetse hantle ha metsi. the
(2) Lihlahisoa tsa seretse tse nang le maemo a fapaneng a matla bakeng sa meaho e akaretsang ea indasteri le ea sechaba li ka etsoa. the
(3) Theko ea thepa e tlase haholo ho feta ea cellulose ether le starch ether.
(4) Ho boloka metsi ho fokotsehile ho feta moemeli oa ho boloka metsi a manyolo, boleng bo omileng ba ho fokotseha ha seretse se lokiselitsoeng bo boholo, 'me ho kopana hoa fokotseha. the
4. Ho sebelisoa ha starch ether
Starch ether e sebelisoa haholo-holo ka seretse sa kaho, se ka amang ho tsitsa ha seretse se thehiloeng ho gypsum, samente le kalaka, le ho fetola kaho le ho hanyetsa sag ea seretse. Hangata li-ether tsa starch li sebelisoa hammoho le li-cellulose ethers tse sa fetoloang le tse fetotsoeng. E loketse mekhoa ea bobeli e sa nke lehlakore le ea alkaline, 'me e lumellana le lisebelisoa tse ngata tsa gypsum le lihlahisoa tsa samente (tse kang li-surfactants, MC, starch le polymers tse qhibilihang ka metsi tse kang polyvinyl acetate).
Lintlha tse ka sehloohong:
(1) Hangata starch ether e sebelisoa hammoho le methyl cellulose ether, e bontšang phello e ntle ea synergistic pakeng tsa tse peli. Ho eketsa tekanyo e loketseng ea starch ether ho methyl cellulose ether ho ka ntlafatsa haholo ho hanyetsa sag le khanyetso ea ho thella ha seretse, ka boleng bo phahameng ba chai. the
(2) Ho eketsa tekanyo e loketseng ea starch ether ho seretse se nang le methyl cellulose ether ho ka eketsa haholo ho tsitsisa ha seretse le ho ntlafatsa mokelikeli, ho etsa hore kaho e be bonolo le ho senya. (3) Ho eketsa tekanyo e loketseng ea starch ether seretseng se nang le methyl cellulose ether ho ka eketsa ho boloka metsi a seretse le ho lelefatsa nako e bulehileng. the
(4) Starch ether ke setache se fetotsoeng ka lik'hemik'hale se qhibilihang ka metsing, se lumellanang le lisebelisoa tse ling ka har'a seretse sa phofo se omeletseng, se sebelisoang haholo ho li-adhesives, li-mortars tsa ho lokisa, li-plaster plasters, ka hare le bokantle ba lebota putty, gypsum-based Joints le ho tlatsa thepa. , li-interface agents, seretse sa masonry.
Litšobotsi tsa starch ether haholo li ka ho: ⑴ntlafatsa ho hanyetsa sag; ⑵ ho ntlafatsa kaho; ⑶ ho eketseha ha lihlahisoa tsa seretse, litekanyetso tse khothalletsoang: 0.03% ho isa ho 0.05%.
Nako ea poso: Feb-16-2023