Starch ether ishoko rakajairwa kukirasi yeakagadziridzwa masita ane ether zvisungo mumorekuru, inozivikanwawo se etherified starch, iyo inoshandiswa zvakanyanya mumishonga, chikafu, machira, kugadzira mapepa, makemikari ezuva nezuva, peturu uye mamwe maindasitiri. Nhasi isu tinonyanya kutsanangura basa re starch ether mudhaka.
Nhanganyaya kune Starch Ether
Iyo inonyanya kushandiswa uye inonyanya kushandiswa ndeye mbatata starch, tapioca starch, corn starch, gorosi starch, etc. Kana ichienzaniswa ne cereal starch ine mafuta akawanda uye mapuroteni ane huwandu, midzi yembesa starch yakadai sembatatisi uye tapioca starch yakanyanya kuchena.
Starch i polysaccharide macromolecular compound inoumbwa neglucose. Kune marudzi maviri emamorekuru, mutsara uye branched, anonzi amylose (anenge 20%) uye amylopectin (anenge 80%). Kuti uvandudze hupfumi hwe starch hunoshandiswa mukuvaka zvinhu, nzira dzemuviri uye dzemakemikari dzinogona kushandiswa kuigadzirisa kuita kuti zvimiro zvayo zvinyatsoenderana nezvinangwa zvakasiyana zvekuvaka.
Etherified starch inosanganisira marudzi akasiyana ezvigadzirwa. Zvakadai se carboxymethyl starch ether (CMS), hydroxypropyl starch ether (HPS), hydroxyethyl starch ether (HES), cationic starch ether, etc. Inowanzoshandiswa hydroxypropyl starch ether.
Basa rehydroxypropyl starch ether mudhaka
1) Gadzirisa dhaka, wedzera anti-sagging, anti-sagging uye rheological zvimiro zvedhaka.
Semuyenzaniso, mukuvaka mataira anonamira, putty, uye plastering dhaka, kunyanya iko zvino iko iko iko kupfapfaidza kwemuchina kunoda kuyerera kwakanyanya, senge mudhaka-based gypsum, inonyanya kukosha (muchina-sprayed gypsum inoda yakakwira fluidity asi ichizokonzeresa kusaga. , starch Ether inogona kugadzirisa kushayikwa uku).
Fluidity uye sag kuramba zvinowanzopokana, uye kuwedzera kwemvura kunotungamira mukudzikira kwekusaga kuramba. Doka rine rheological properties rinogona kugadzirisa kupokana kwakadaro, kureva kuti, kana simba rekunze rikaiswa, viscosity inodzikira, ichiwedzera kushanda uye kupomba, uye kana simba rekunze rabviswa, viscosity inowedzera uye kuramba kwekudzikisira kunovandudzwa.
Nekuda kwemaitiro azvino ekuwedzera mataira nzvimbo, kuwedzera starch ether kunogona kuvandudza kutsvedza kupikisa kwekunamatira mataira.
2) Kuwedzerwa maawa ekuvhura
Kune mataira anonamira, anogona kusangana nezvinodiwa zveakakosha mataira adhesives (Kirasi E, 20min yakawedzera kusvika 30min kusvika 0.5MPa) iyo inowedzera nguva yekuvhura.
Kuvandudzwa kwenzvimbo
Starch ether inogona kuita pamusoro pegypsum base uye simende dhaka kutsvedzerera, nyore kuisa, uye ine yakanaka yekushongedza maitiro. Izvo zvine zvazvinoreva kupurasita dhaka uye nhete yekushongedza dhaka senge putty.
Maitiro ekuita kwehydroxypropyl starch ether
Kana starch ether inonyunguduka mumvura, inoparadzirwa zvakafanana musimende yedhaka system. Sezvo starch ether molecule ine network network uye inopomerwa zvisina kunaka, inotora zvakanaka chaja simende zvimedu uye inoshanda senge bhiriji rekuchinjisa kubatanidza simenti, nokudaro kupa Iyo yakakura goho kukosha kwe slurry kunogona kuvandudza anti-sag kana anti-kutsvedza. effect.
Musiyano uripo pakati pehydroxypropyl starch ether ne cellulose ether
1. Starch ether inogona kunyatsovandudza anti-sag uye anti-slip properties yedhaka
Cellulose ether kazhinji inogona kungovandudza viscosity uye kuchengetwa kwemvura kwegadziriro asi haigone kuvandudza anti-sagging uye anti-slip properties.
2. Kukora uye viscosity
Kazhinji, viscosity ye cellulose ether inenge makumi ezviuru, nepo viscosity ye starch ether inosvika mazana akawanda kusvika kuzviuru zvakati wandei, asi izvi hazvirevi kuti starch ether ine simba rinopinza mhepo, asi starch ether haina mhepo inopinza mhepo. .
5. Molecular chimiro che cellulose ether
Kunyangwe ese ari maviri starch uye cellulose akaumbwa neglucose mamorekuru, maitiro avo ekugadzira akasiyana. Mamiriro emamolekemu ese eglucose mu starch akafanana, nepo iyo cellulose yakangopesana, uye kutaridzika kweimwe neimwe iri padyo neglucose molecule yakatarisana. Uyu mutsauko wekuumbwa unosarudzawo mutsauko muzvinhu zve cellulose uye starch.
Nguva yekutumira: Kubvumbi-10-2023