introduce
Hydroxypropyl methylcellulose (HPMC) is a cellulose ether inoshandiswa zvakanyanya mumaindasitiri akasiyana sechikafu, mushonga, uye kuvaka semukobvu, emulsifier, uye stabilizer. Muindasitiri yekuvaka, HPMC inowanzo shandiswa sekuwedzera kune simende-yakavakirwa zvinhu kuti uwane inodiwa zvivakwa zvakaita sekushanda, kuchengetedza mvura uye kusimba. Zvidzidzo zvakaona kuti kuwedzera HPMC kune simende-yakavakirwa zvinhu kunonotsa iyo hydration process ye simende, zvichizokanganisa kusimukira kwesimba resimende-yakavakirwa zvinhu.
Mhedzisiro yeHPMC pane simende hydration
Cement hydration chiitiko chakaoma chemakemikari chinosanganisira maitiro emvura neakaoma simende zvimedu. Munguva ye hydration process, simende zvimedu zvinosangana nemvura kuti zvigadzire zvakasiyana siyana hydration zvigadzirwa, izvo zvinobatsira kuvandudza kusimba kwesimende-yakavakirwa zvinhu. Zvidzidzo zvakaona kuti kuwedzera kweHPMC kune simende-yakavakirwa zvinhu kunogona kunonoka simende hydration, nekudaro kuchinja chiyero uye chiyero chekusimudzira simba.
Chimwe chezvikonzero zvikuru zvekunonoka simende hydration inzvimbo yekuchengetedza mvura yeHPMC. HPMC inonzi hydrophilic polymer inotora mvura uye inozvimba kuita gel-sechimiro. Kana HPMC yawedzerwa kune simende-yakavakirwa zvinhu, inotora mvura kubva mumusanganiswa, nekudaro ichidzikisa mvura yemahara inodiwa hydrate simende. Izvi zvinoderedza hydration process, sezvo kuita kwe simenti nemvura kunoda mvura yakakwana.
Chimwe chinhu chinoita kuti kunonoke simende hydration ndeye adsorption yeHPMC pamusoro pezvimedu zvesimende. HPMC ine hukama hwepamusoro hwesimende masimendi nekuda kwekusiyana kwayo. Inogona kuve yakashongedzwa pamusoro pezvimedu zvesimende uye kuumba chipingamupinyi chemuviri kudzikamisa kusangana pakati pemamorekuru emvura uye simende zvimedu. Izvi zvinononotsa kuita simende nemvura, zvichikonzera kunonoka simende hydration.
Kuwedzerwa kweHPMC kune simende-yakavakirwa zvinhu kuchakanganisawo nucleation uye kristaro kukura maitiro e hydration zvigadzirwa. Hydration ye simenti inosanganisira kuumbwa kwezvikamu zvakasiyana-siyana zvecrystalline, zvakadai se calcium silicate hydrate (CSH) uye calcium hydroxide (CH). HPMC inogona kutadzisa nucleation uye kukura kwekristaro kwezvimwe zvezvikamu izvi, zvichiwedzera kunonoka simende hydration.
Iyo michina ye simenti hydration kunonoka
Iyo yekutanga nzira iyo HPMC inonoke simende hydration kuumbwa kwechivharo chemuviri pakati pemasimende uye mvura. Kana HPMC yakaparadzirwa mumvura, inoumba gel-senge matrix iyo inogona kuvharira simende zvimedu uye kuderedza kuwanikwa kwemvura yemahara ye simende hydration. Izvi zvinoderedza kuita kwesamende nemvura, zvichikonzera kunonoka mukusimba kwesimba resimende-yakavakirwa zvinhu.
Imwe nzira ndeyekushambadza kweHPMC pamusoro pemasimende esimende. HPMC ine hukama hwepamusoro hwesimende masimendi nekuda kwekusiyana kwayo. Inogona kuve yakashongedzwa pamusoro pezvimedu zvesimende uye kuumba chipingamupinyi chemuviri kudzikamisa kusangana pakati pemamorekuru emvura uye simende zvimedu. Izvi zvinowedzera kunonoka kuita kwesamende nemvura.
HPMC inogona zvakare kudyidzana neakasiyana masimende, senge calcium ions, nekudaro ichikanganisa nucleation uye kristaro kukura maitiro e hydration zvigadzirwa. HPMC inogona kutadzisa nucleation uye kukura kwekristaro kwezvimwe zvezvikamu izvi, zvichiwedzera kunonoka simende hydration.
mukupedzisa
Kuwedzerwa kweHPMC kune cementitious zvinhu kunogona kunonoka simende hydration, nekudaro ichichinja chiyero uye chiyero chekukura kwesimba. Iyo nzira yekunonoka simende hydration inonyanya kukonzerwa nekuumbwa kwechivharo chemuviri pakati pemasimende uye mvura, iyo inoshambadzirwa pamusoro pemasimende masimende uye inodzivirira iyo nucleation uye kristaro kukura maitiro e hydration zvigadzirwa. Kunzwisisa maitiro ayo HPMC inodzoreredza simende hydration inogona kutibvumira kukwidziridza mashandisirwo eHPMC mune simende zvinhu kuti tiwane zvivakwa zvinodiwa tichichengetedza kusimudzira kwesimba resimende zvinhu.
Nguva yekutumira: Oct-24-2023