Mumota yakasanganiswa, huwandu hwekuwedzera hwehydroxypropyl methyl cellulose HPMC hwakaderera zvikuru, asi hunogona kuvandudza zvakanyanya mashandiro emota yakanyorova, inova chinhu chikuru chinokanganisa mashandiro ekuvaka kwemota. Cellulose ethers ine viscosity yakasiyana uye huwandu hwakawedzerwa ine mhedzisiro yakanaka pakuvandudza mashandiro emota yakaoma. Parizvino, mamota mazhinji ekugadzira nekuisa plaster ane hunhu husina kunaka hwekuchengetedza mvura, uye kupatsanurwa kweslurry yemvura kunoitika mushure memaminitsi mashoma ekumira. Kuchengetwa kwemvura ibasa rakakosha remethyl cellulose ether, uye zvakare ibasa iro vagadziri vemota yakaoma vekumba, kunyanya avo vari munzvimbo dzine tembiricha yakakwira kumaodzanyemba, vanoteerera. Zvinhu zvinokanganisa mhedzisiro yekuchengetedza mvura yemota yakaoma zvinosanganisira huwandu hweHPMC yakawedzerwa, viscosity yeHPMC, kupfava kwezvikamu uye tembiricha yenzvimbo yainoshandiswa.
1. Pfungwa: Cellulose ether ipolymer yakagadzirwa nemasero akawanda yakagadzirwa ne cellulose yechisikigo kuburikidza nekuchinja kwemakemikari. Cellulose ether inobva mu cellulose yechisikigo. Kugadzirwa kwe cellulose ether kwakasiyana ne polymer dzechisikigo. Chinhu chayo chikuru i cellulose, musanganiswa we polymer wechisikigo. Nekuda kwechimiro chakakosha che cellulose yechisikigo, cellulose pachayo haina kugona kuita ne etherifying agents. Asi mushure mekunge musanganiswa wekuzvimba warapwa, hydrogen bonds yakasimba pakati pemaketani emamorekuru uye mukati meketani inoparadzwa, uye kusunungurwa kwe hydroxyl group kunoshanduka kuita reactive alkali cellulose. Mushure mekunge musanganiswa we ether waita reactions, boka re -OH rinoshandurwa kuita boka re -OR. Wana cellulose ether. Hunhu hwe cellulose ether hunoenderana nerudzi, huwandu uye kugoverwa kwezvinotsiva. Kurongwa kwe cellulose ethers kunoenderanawo nerudzi rwezvinotsiva, mwero we etherification, kunyungudika uye mashandisirwo anoenderana. Zvichienderana nerudzi rwezvinotsiva pa molecular chain, inogona kukamurwa kuita monoether ne mixed ether. HPMC yatinowanzo shandisa i-mixed ether. Hydroxypropyl methyl cellulose ether HPMC chigadzirwa umo chikamu che hydroxyl group chiri payuniti chinotsiviwa ne methoxy group uye chimwe chikamu chinotsiviwa ne hydroxypropyl group. HPMC inonyanya kushandiswa muzvinhu zvekuvaka, latex coatings, mishonga, chemistry yezuva nezuva, nezvimwewo. Inoshandiswa se thickener, water-retaining agent, stabilizer, dispersant, uye film-forming agent.
2. Kuchengetwa kwemvura kwe cellulose ether: mukugadzirwa kwezvinhu zvekuvaka, kunyanya dhaka rakaoma, cellulose ether ine basa risingatsiviwi, kunyanya mukugadzirwa kwedhaka rakakosha (dhaka rakagadziriswa), chinhu chakakosha. Basa rakakosha re cellulose ether inonyungudika mumvura mudhaka rinonyanya kuitika muzvikamu zvitatu. Chimwe kugona kwakanaka kwekuchengetedza mvura, chimwe ndechekukanganisa kuenderana uye thixotropy yedhaka, uye chechitatu kusangana nesimende. Mhedzisiro yekuchengetedza mvura ye cellulose ether inoenderana nekunyudzwa kwemvura kwechigadziko, kuumbwa kwedhaka, ukobvu hwedhaka, kudiwa kwemvura kwedhaka, uye nguva yekuiswa kwezvinhu zvinobatanidza. Kuchengetwa kwemvura kwe cellulose ether pachayo kunobva mukunyungudika uye kupera simba kwe cellulose ether pachayo.
kukora uye thixotropy ye cellulose ether: Basa rechipiri rekukora kwe cellulose ether rinoenderana ne: mwero wepolymerization ye cellulose ether, kuwanda kwe solution, tembiricha nezvimwe zvinhu. Hunhu hwe gelation hwe solution hunhu hwakasiyana hwe alkyl cellulose nezvimwe zvinogadzirwa nayo. Hunhu hwe gelation hune chekuita ne mwero wekutsiva, kuwanda kwe solution uye zvimwe zvinowedzerwa.
Kugona kuchengetedza mvura zvakanaka kunoita kuti simende inyatso nyorova, kunogona kuwedzera kunyorova kwesimbi yakanyorova, kuwedzera simba rekubatanidza simbi, uye nguva inogona kugadziriswa. Kuwedzera cellulose ether musimbi yekupfapfaidza kunogona kuvandudza mashandiro ekupfapfaidza kana kupomba simbi, pamwe nekusimba kwechimiro. Nokudaro, cellulose ether iri kushandiswa zvakanyanya sechinhu chakakosha chekuwedzera musimbi yakasanganiswa.
Nguva yekutumira: Zvita-16-2021