Kushandiswa kweCellulose Ether

Mukuumbwa kwevhu rakaoma dhaka,cellulose etherchinhu chakakosha chekuwedzera chine hushoma hwekuwedzera huwandu, asi chinogona kuvandudza zvakanyanya musanganiswa uye kuvaka kuita kwedhaka. Kuisa zviri nyore, zvinenge zvese zvakanyorova kusanganisa zvivakwa zvedhaka zvinogona kuoneka neziso rakashama zvinopihwa ne cellulose ether. Icho chinobva mu cellulose chinowanikwa nekushandisa cellulose kubva muhuni nekotoni, inopindirana necaustic soda, uyezve etherifying ne etherifying agent.

Mhando dze cellulose ethers

A. Hydroxypropyl methyl cellulose (HPMC), iyo inonyanya kugadzirwa nepamusoro-kuchena yakanatswa donje seyakagadzirwa, inonyanya kunyungudutswa pasi pemamiriro ealkaline.
B. Hydroxyethyl methylcellulose (HEMC), isiri-ionic cellulose ether, ipfu chena pakuonekwa, isinganhuhwi uye isinganakidze.
C. Hydroxyethyl cellulose (HEC), isiri-ionic surfactant, chena pachimiro, isinganhuhwi, isinganakidze uye iri nyore-kuyerera poda.

Izvo zviri pamusoro ndezvisiri-ionic cellulose ethers, uye ionic cellulose ethers (senge carboxymethyl cellulose CMC).

Panguva yekushandiswa kwevhu rakaoma dhaka, nokuti ionic cellulose (CMC) haina kugadzikana muhupo hwe calcium ions, haiwanzoshandiswa mune inorganic gelling systems nesamende uye slaked lime se cementing zvinhu. Mune dzimwe nzvimbo muChina, Mamwe emukati emadziro putties akagadziridzwa neakagadziridzwa starch sechinhu chikuru chekuisa simende uye Shuangfei poda semuzadziri anoshandisa CMC seanokora. Zvisinei, nokuti chigadzirwa ichi chinowanzoita mildew uye hachina kumira nemvura, zvishoma nezvishoma chinobviswa nemusika. Parizvino, cellulose ether inonyanya kushandiswa kuChina iHPMC.

Cellulose ether inonyanya kushandiswa seyekuchengetedza mvura uye thickener mune simende-based zvinhu.

Basa rayo rekuchengetedza mvura rinogona kudzivirira substrate kuti irege kutora mvura yakawandisa uye inodzivisa kubuda kwemvura, kuitira kuti ive nechokwadi chokuti simenti ine mvura yakakwana kana iine hydrated. Tora basa rekupurasita semuenzaniso. Kana yakajairwa simende slurry yakaiswa kune yakadzika pasi, iyo yakaoma uye ine porous substrate inokurumidza kutora yakawanda yemvura kubva kune slurry, uye simende slurry layer padyo ne base layer inorasa nyore nyore mvura inodiwa hydration. , saka kwete chete haigoni kuumba simenti gel ine simba rekubatanidza pamusoro pe substrate, asi inowanzoita warping uye mvura seepage, kuitira kuti pasi simende slurry layer iri nyore kudonha. Apo grout yakashandiswa yakatetepa, zviri nyorewo kuumba kuputika mune grout yose. Naizvozvo, munguva yakapfuura pamusoro pekuisa plastering, mvura inowanzoshandiswa kunyorovesa substrate kutanga, asi kuvhiya uku hakusi kungoshanda-yakawanda uye kunopedza nguva, asiwo hutano hwekushanda hwakaoma kudzora.

Kazhinji kutaura, kuchengetwa kwemvura ye simenti slurry kunowedzera nekuwedzera kwemukati we cellulose ether. Iyo yakakura viscosity yeakawedzera cellulose ether, zviri nani kuchengetedza mvura.

Pamusoro pekuchengetedza mvura uye kukora, cellulose ether inokanganisawo zvimwe zvinhu zvesamende dhaka, senge retarding, intraining mhepo, uye kuwedzera bond simba. Cellulose ether inononoka kugadzirisa uye kuomesa simenti, nokudaro kuwedzera nguva yekushanda. Nokudaro, dzimwe nguva inoshandiswa se coagulant.

Nekugadzirwa kwedhaka rakaoma-musanganiswa,cellulose etheryave yakakosha simende musanganiswa wedhaka. Nekudaro, kune akawanda emhando uye zvirevo zve cellulose ether, uye mhando pakati pemabhechi ichiri kuchinja.