Cellulose ethers imhando yemvura-inonyungudika yepolymer compound yakaumbwa mushure mekugadzirisa kemikari ye cellulose. Izvo zvinoshandiswa zvakanyanya mukuvaka zvinhu, kunyanya kana zvichishandiswa mudhaka nemhedzisiro yakakosha.
Zvinhu zvakakosha zve cellulose ethers
Cellulose ethers imhando yepolymer inowanikwa nemakemikari kurapwa kwechisikigo cellulose. Common cellulose ethers dzinosanganisira hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), carboxymethylcellulose (CMC) etc. Vane solubility yakanaka uye thickening mano, uye anogona kuumba yunifomu uye yakagadzikana colloidal mhinduro mumvura. Izvi zvinhu zvinoita kuti cellulose ethers ishandiswe zvakanyanya mukuvaka zvinhu.
Izvo zvakakosha zve cellulose ethers zvinosanganisira:
Kukora: inogona kuwedzera zvakanyanya viscosity yemvura masisitimu.
Kuchengetedza mvura: Iine simba rakasimba rekuchengetedza mvura uye inogona kuchengetedza mvura kuti isarasikike panguva yekuvaka.
Kugadzira firimu: Inogona kugadzira firimu rakafanana pamusoro pechinhu kuti chidzivirire nekuchisimudzira.
Lubricity: Inovandudza kuita kwekuvaka kwedhaka, zvichiita kuti zvive nyore kuisa uye kuumbwa.
Basa guru re cellulose ether mudhaka
Basa re cellulose ether mudhaka rinonyanya kuratidzwa mune zvinotevera zvinhu:
1. Kuvandudza kuchengetedza kwemvura
Doka rinowanzoita kurasikirwa kwesimba uye matambudziko ekutsemuka nekuda kwekurasikirwa nemvura panguva yekuvaka. Cellulose ether ine mvura yakanaka yekuchengetedza uye inogona kuumba hurongwa hwetiweki mudhaka kuti ivhare munyoro uye kuderedza kubuda kwemvura uye kurasikirwa, nokudaro kuvandudza kuchengetedza kwemvura kwedhaka. Izvi hazvisi kungowedzera nguva yekuvhura kwedhaka, asi zvakare inovimbisa kuti dhaka rakazara nemvura panguva yekuomeswa kwemaitiro, kuwedzera simba rayo uye kusimba.
2. Kuvandudza kushanda kwekuvaka
Iyo lubricating mhedzisiro ye cellulose ether inoita kuti dhaka ripfavise panguva yekuvaka, nyore kuisa nekupararira, uye inovandudza kuvaka. Panguva imwecheteyo, iyo inokora pfuma ye cellulose ether inoita kuti dhaka rive rakanaka thixotropy, kureva kuti, inova mutete kana ichiiswa simba rekugera uye inodzokera kune yayo yekutanga viscosity mushure mekunge simba rekugera ranyangarika. Hunhu uhwu hunoita kuti dhaka risanyanya kudonha panguva yekuvaka uye kuchengetedza chimiro chakanaka chekuvaka.
3. Wedzera kunamatira kwedhaka
Cellulose ether inogona kuumba yunifomu yetiweki chimiro mudhaka, kuwedzera simba rekunamatira redhaka, nekuvandudza kunamatira kwayo kune substrate. Izvi zvinogona kudzivirira dhaka kubva pakupatsanurwa kubva kune hwaro zvinhu panguva yekuomeswa uye kuderedza kuitika kwehutano matambudziko akadai segomba uye kudonha.
4. Kuvandudza kupesana nekutsemuka
Iyo firimu-inogadzira pfuma ye cellulose ether inobvumira dhaka kuti riite firimu rakatetepa pamusoro pepamusoro panguva yekuomeswa kwekuita, iyo inoita basa rekudzivirira uye inoderedza kukanganiswa kwekunze kwekunze pane dhaka. Panguva imwecheteyo, kuchengetwa kwemvura uye kukora zvivakwa kunogonawo kuderedza shrinkage kutsemuka kunokonzerwa nekurasikirwa kwemvura mudhaka uye kunatsiridza kutsemuka kwayo.
Mamiriro chaiwo e cellulose ethers pane zvivakwa zvedhaka
Iko kukanganiswa kwe cellulose ether pakuita kwedhaka kunogona kuongororwa zvakadzama kubva pane zvinotevera:
1. Kushanda
Doka rakawedzerwa ne cellulose ether rinoita zviri nani maererano nekushanda kwekushanda. Kuchengeta kwayo mvura kwakanakisa uye kunhuhwirira kunoita kuti dhaka ripfavise panguva yekuvaka, kuve nyore kushanda, uye kusanyanya kunetsa kuvaka. Panguva imwecheteyo, iyo thickening effect ye cellulose ether inogona kuvandudza thixotropy yedhaka, kuitira kuti dhaka rikwanise kuchengetedza chimiro chayo zvakanaka panguva yekuvaka uye haisi nyore kudonha uye sag.
2. Simba
Kuchengetwa kwemvura kwe cellulose ether kunoita kuti dhaka richengetedze hunyoro hwakakwana panguva yekuomesa, inosimudzira hydration reaction ye simenti, uye inoumba yakaomesesa hydration chigadzirwa chimiro, nekudaro ichivandudza kusimba kwedhaka. Mukuwedzera, kugovera yunifomu uye kusungirirwa kweselulosi ether kunogonawo kuita kuti chimiro chemukati chedhaka chigadzikane, kuderedza kuitika kwe micro-cracks, nekuvandudza simba rose.
3. Kugara kwenguva refu
Nemhaka yokuti cellulose ether inogona kunyatsochengetedza hunyoro mudhaka, dhaka rinogona kuumba chimiro chakafanana panguva yekuoma kwekuita, kuderedza kuitika kwekuputsika kwe shrinkage, nokudaro kuvandudza kusimba kwedhaka. Iyo firimu inoumbwa ne cellulose ether inogonawo kuchengetedza pasi pevhu kusvika pamwero wakati, kuderedza kukukurwa kwedhaka nekunze kwezvakatipoteredza, uye kuwedzera kuwedzera kwayo kusimba.
4. Kuchengetedza mvura uye kusagadzikana kwekuputika
Cellulose ether inogona kuvandudza zvakanyanya kuchengetwa kwemvura kwedhaka, zvichiita kuti dhaka richengetedze unyoro hwakakwana panguva yekuoma uye kuderedza kuitika kwekuputsika kwe shrinkage. Mukuwedzera, iyo firimu-inogadzira pfuma ye cellulose ether inobvumira dhaka kuti rigadzire firimu rekudzivirira pamusoro, kuderedza kukanganiswa kwekunze kwekunze pane dhaka uye kuvandudza kusagadzikana kwayo kwekuputika.
Kushandiswa kwe cellulose ether mudhaka kune zvakakosha. Kuchengetedza kwayo kwakanakisa kwemvura, kukora, kugadzira firimu uye lubricity kwakavandudza zvakanyanya kuita kwekuvaka, simba, kusimba uye zvimwe zvinhu zvedhaka. Nokudaro, cellulose ether, sekuwedzera kwakakosha, yakashandiswa zvakanyanya muzvigadzirwa zvemazuva ano zvekuvaka uye yava nzira inokosha yekuvandudza kushanda kwedhaka.
Nguva yekutumira: Jul-12-2024