Ko te Cellulose ether he pūhui polymer i whakahiatohia mai i te cellulose taiao na roto i te tukanga etherification, a he pai rawa atu ki te whakakaha me te pupuri wai.
Rangahau Papamuri
Ko nga etera cellulose kua whakamahia nuitia i roto i te moata whakauru maroke i roto i nga tau kua pahure ake nei, ko te nuinga o te whakamahi ko etahi etera cellulose kore-ionic, tae atu ki te methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC). ) me te hydroxypropyl methyl cellulose ether (HPMC).I tenei wa, kaore i te maha nga tuhinga mo te tikanga inenga o te pokey o te otinga cellulose ether.I roto i to tatou whenua, ko etahi paerewa me nga monographs anake e kii ana i te tikanga whakamatautau mo te viscosity o te otinga cellulose ether.
Te Whakaritenga o te Methyl Cellulose Ether Solution
Ko nga ethers methyl cellulose e tohu ana ki nga ethers cellulose kei roto nga roopu methyl i roto i te ngota, penei i te MC, HEMC me te HPMC.Na te kaha o te waiariki o te roopu methyl, ko nga otinga cellulose ether kei roto i nga roopu methyl he tohu waiariki waiariki, ara, karekau e rewa i roto i te wai wera i te pāmahana teitei ake i te pāmahana whakahiato (mo te 60-80°C).Kia kore ai te otinga eter cellulose e hanga agglomerates, whakamahana i te wai i runga ake i tona pāmahana reera, mo te 80~90°C, katahi ka tapirihia te paura cellulose ether ki roto i te wai wera, whakaohokia kia marara, kia mau tonu te whakaoho me te whakamatao Ki te huinga. te pāmahana, ka taea te whakarite ki te otinga ether cellulose.
Hei karo i te agglomeration o te cellulose ether i te wa o te whakangao, ka mahia e nga kaihanga i etahi wa he maimoatanga mata matū ki runga i nga hua paura cellulose ether hei whakaroa i te whakakorenga.Ka puta tana tukanga whakakore i muri i te marara katoa o te cellulose ether, na reira ka taea te marara ki roto i te wai matao me te uara pH koretake me te kore e hanga agglomerates.Ko te teitei ake o te uara pH o te otinga, ka poto ake te wa rewa o te etera cellulose me nga ahuatanga whakaroa kua roa.Whakaritea te uara pH o te otinga ki te uara teitei ake.Ka whakakorehia e te kawakore te roa o te whakarewatanga o te cellulose ether, na te mea ka hanga agglomerates te cellulose ether ina memeha.No reira, me whakaara ake, me whakaheke ranei te uara pH o te otinga i muri i te marara katoa o te etera cellulose.
Te Whakaritenga o Hydroxyethyl Cellulose Ether Solution
Ko te otinga Hydroxyethyl cellulose ether (HEC) karekau he taonga mo te waiariki waiariki, no reira, ko te HEC kaore he maimoatanga mata ka hanga ano he agglomerates i roto i te wai wera.Ko te tikanga ka mahia e nga Kaihanga he maimoatanga mata matū i runga i te HEC paura hei whakaroa i te whakakorenga, kia tika ai te marara ki te wai matao me te uara pH kore e hanga agglomerates.Waihoki, i roto i te otinga he nui te kawakore, HEC Ka taea hoki te hanga agglomerates na te roa o te ngaronga whakarewatanga.I te mea he kawakore te slurry ciment i muri i te whakamakuku me te uara pH o te otinga kei waenga i te 12 me te 13, he tino tere hoki te tere o te whakakorenga o te etera cellulose i te mata i roto i te slurry sima.
Te Whakamutunga me te Tatautanga
1. Te mahi marara
Hei karo i nga paanga kino i te wa whakamatautau na te puhoi o te whakakorenga o nga matū maimoatanga mata, ka tūtohutia kia whakamahia te wai wera mo te whakarite.
2. Te mahi whakamatao
Me whakakorikori, ka whakamataohia nga wairewa ether cellulose i te pāmahana ambient hei whakaiti i te reiti whakamatao, me whakaroa nga wa whakamatautau.
3. Te mahi whakakorikori
I muri i te taapiri i te cellulose ether ki te wai wera, kia mau tonu te whakaoho.Ka taka iho te pāmahana wai ki raro i te pāmahana reera, ka tiimata te memeha o te cellulose ether, ka tere haere te wairewa.I tenei wa, me whakaiti te tere o te whakaoho.Ka tae te otinga ki tetahi pokey, me tu tonu mo te neke atu i te 10 haora i mua i te tere tere o nga mirumiru ki te mata kia pakaru, ka ngaro.
4. Tukatuka hydrating
Ko te kounga o te cellulose ether me te wai kia tika te ine, me te ngana kia kaua e tatari kia eke te otinga ki te pokey teitei ake i mua i te whakakii i te wai.
5. Whakamātautau viscosity
Na te thixotropy o te otinga cellulose ether, i te wa e whakamatautau ana i tona pokey, ka whakauruhia te rotor o te viscometer hurihuri ki roto i te otinga, ka whakararuraru i te otinga ka pa ki nga hua ine.Na reira, i muri i te whakauru o te rotor ki te otinga, me tuku kia tu mo te 5 min i mua i te whakamatautau.
Wā tuku: Feb-08-2023