1. Basa guru re cellulose ether
Mudhaka yakagadzirira-yakasanganiswa, cellulose ether ndiyo inonyanya kuwedzera iyo inowedzerwa muhuwandu hwakaderera zvikuru asi inogona kuvandudza zvakanyanya kushanda kwedhaka rakanyorova uye inokanganisa kushanda kwekuvaka kwedhaka.
2. Mhando dze cellulose ethers
Kugadzirwa kwe cellulose ether kunonyanya kugadzirwa neakasikwa fibers kuburikidza nealkali dissolution, grafting reaction (etherification), kugeza, kuomesa, kugaya uye mamwe maitiro.
Maererano nemhando huru yezvigadzirwa, zvisikwa zvepanyama zvinogona kugoverwa kuva: fiber fiber, cedar fiber, beech fiber, nezvimwewo.Parizvino, vagadziri vakuru ve cellulose vanoshandisa fiber yekotoni (ne-chigadzirwa chenitrocellulose) sechinhu chikuru mbishi.
Cellulose ethers inogona kukamurwa kuita ionic uye nonionic.Iyo ionic mhando inonyanya kusanganisira carboxymethyl cellulose munyu, uye iyo isiri-ionic mhando inonyanya kusanganisira methyl cellulose, methyl hydroxyethyl (propyl) cellulose, hydroxyethyl cellulose, nezvimwe.
Parizvino, ma cellulose ethers anoshandiswa mudhaka yakakanyiwa anonyanya kuve methyl cellulose ether (MC), methyl hydroxyethyl cellulose ether (MHEC), methyl hydroxypropyl cellulose ether (MHPG), hydroxypropyl Methyl cellulose ether (HPMC).Mudhaka yakagadzirira-yakasanganiswa, nokuti ionic cellulose (carboxymethyl cellulose munyu) haina kugadzikana muhupo hwe calcium ions, haiwanzoshandiswa muzvigadzirwa zvakagadzirirwa zvinoshandisa simenti, slaked lime, nezvimwewo semasimende zvinhu.Mune dzimwe nzvimbo kuChina, carboxymethyl cellulose munyu inoshandiswa seyakakora yezvimwe zvigadzirwa zvemukati zvakagadziriswa neyakagadziridzwa starch sechinhu chikuru chekuisa simende uye Shuangfei poda semuzadziri.Ichi chigadzirwa chinowanzoita mildew uye hachina kumira nemvura, uye ikozvino chiri kubviswa.Hydroxyethyl cellulose inoshandiswawo mune zvimwe zvakagadzirirwa-musanganiswa zvigadzirwa, asi ine chikamu chidiki kwazvo chemusika.
3. Main performance zviratidzo zve cellulose ether
(1) Kunyungudika
Cellulose i polyhydroxy polymer compound isinganyungudike kana kunyungudika.Mushure me etherification, cellulose inonyungudika mumvura, dilute alkali solution uye organic solvent, uye ine thermoplasticity.Solubility inonyanya kuenderana nezvinhu zvina: kutanga, solubility inosiyana ne viscosity, iyo yakaderera iyo viscosity, iyo yakakura solubility.Chechipiri, maitiro emapoka akaunzwa mune etherification process, iyo yakakura boka yakaunzwa, yakaderera solubility;iyo boka rinowedzera polar, zvinoita nyore kuti cellulose ether inyunguduke mumvura.Chechitatu, dhigirii rekutsiva uye kugoverwa kwemapoka etherified mune macromolecules.Mazhinji cellulose ether anogona kungonyungudika mumvura pasi peimwe dhigirii yekutsiva.Chechina, dhigirii repolymerization ye cellulose ether, iyo yakakwirira dhigirii yepolymerization, iyo isinganyanyike zvishoma;iyo yakaderera dhigirii yepolymerization, iyo yakakura huwandu hwedhigirii yekutsiva iyo inogona kunyungudika mumvura.
(2) Kuchengeta mvura
Kuchengetedzwa kwemvura ibasa rakakosha re cellulose ether, uye zvakare ibasa iro vazhinji vedzimba vanogadzira hupfu hwakaoma, kunyanya avo vari kumatunhu ekumaodzanyemba ane tembiricha yakanyanya, vanoteerera.Zvinhu zvinokanganisa kuchengetedza kwemvura kwedhaka zvinosanganisira huwandu hweselulosi ether yakawedzerwa, viscosity, particle fineness uye tembiricha yenzvimbo yekushandisa.Iyo yakakwirira huwandu hwe cellulose ether yakawedzerwa, zviri nani kuchengetedza mvura;iyo yakakura viscosity, zviri nani kuchengetedza mvura;iyo yakatsetseka zvidimbu, zviri nani kuchengetedza mvura.
(3) Viscosity
Viscosity inokosha parameter ye cellulose ether zvigadzirwa.Parizvino, vagadziri vakasiyana ve cellulose ether vanoshandisa nzira dzakasiyana uye zviridzwa kuyera viscosity.Pachigadzirwa chimwe chete, mhedzisiro yeviscosity yakayerwa nenzira dzakasiyana zvakasiyana kwazvo, uye mamwe anotopetwa kaviri misiyano.Naizvozvo, kana uchienzanisa viscosity, inofanirwa kuitwa pakati pedzimwe nzira dzekuyedza, kusanganisira tembiricha, rotor, nezvimwe.
Kazhinji kutaura, iyo yakakwirira viscosity, zviri nani kuchengetedza mvura.Zvisinei, iyo yakakwirira ye viscosity, iyo yakakwirira ye molecular huremu hwe cellulose ether, uye kuderera kunowirirana mukunyungudika kwayo kuchava nemigumisiro yakaipa pakusimba uye kushanda kwekuvaka kwedhaka.Iyo yakakwirira viscosity, iyo inonyanya kuoneka iyo thickening mhedzisiro padhaka, asi haina kuenzana zvakananga.Iyo yakakwirira iyo viscosity, iyo yakanyanya viscous iyo dhaka rakanyorova richava.Panguva yekuvaka, inoratidzirwa sekunamatira kune scraper uye yakakwirira kunamatira kune substrate.Asi hazvibatsiri kuwedzera simba rekugadzirisa dhaka rakanyorova pacharo.Panguva yekuvaka, iyo anti-sag performance haisi pachena.Pane zvinopesana, imwe yepakati uye yakaderera viscosity asi yakagadziridzwa methyl cellulose ethers ine yakanakisa mashandiro mukuvandudza kusimba kwechimiro chedhaka rakanyorova.
(4) Kunaka kwezvikamu:
Iyo cellulose ether inoshandiswa kune yakagadzirira-yakavhenganiswa dhaka inodiwa kuti ive upfu, ine yakaderera mvura yemukati, uye kutsetseka kunodawo 20% kusvika 60% yehukuru hwechikamu kuti ive isingasviki 63 μm.Iko kunaka kunokanganisa kunyungudika kwe cellulose ether.Coarse cellulose ethers anowanzo ari muchimiro chegranules, ayo ari nyore kuparadzira uye kunyungudika mumvura pasina agglomeration, asi mwero wekunyunguduka unononoka, saka hauna kukodzera kushandiswa mudhaka rakagadzirwa-rakasanganiswa (zvimwe zvigadzirwa zvemumba zvinoputika, hazvisi nyore kuparadzira uye kunyungudika mumvura, uye inowanzoitika kukiki).Mune yakagadzirira-yakasanganiswa dhaka, cellulose ether inoparadzirwa pakati peaggregates, yakanaka mafirita uye simende uye zvimwe simende zvinhu.Upfu hwakakwana chete hunogona kudzivirira cellulose ether agglomeration kana uchisanganiswa nemvura.Apo cellulose ether inowedzerwa nemvura kuti iparadze agglomeration, zvakaoma zvikuru kuparadzira uye kupera.
(5) Kugadziriswa kwe cellulose ether
Kugadziriswa kwe cellulose ether ndiko kuwedzera kwekuita kwayo, uye ndiyo inonyanya kukosha chikamu.Zvinhu zve cellulose ether zvinogona kuvandudzwa kuti iwedzere kunyorova kwayo, dispersibility, adhesion, thickening, emulsification, kuchengetedza mvura uye firimu-kugadzira zvinhu, pamwe nekusapinda kwayo kumafuta.
4. Mhedzisiro yeambient tembiricha pakuchengetedza mvura kwedhaka
Kuchengetwa kwemvura ye cellulose ether kunoderera nekuwedzera kwekushisa.Mukushandiswa kwezvinhu zvinoshanda, dhaka rinowanzoiswa kune inopisa substrates pane tembiricha yepamusoro (inodarika 40 ° C) munzvimbo dzakawanda.Kudonha kwekuchengetwa kwemvura kwakakonzera kukanganisa kunoonekwa pakushanda uye kusagadzikana kwekutsemuka.Kutsamira kwaro patembiricha kucharamba kuchitungamira mukuderera kwedhaka zvivakwa, uye zvinonyanya kukosha kudzikisa pesvedzero yetembiricha zvinhu pasi peichi mamiriro.Mabikirwo ematope akagadziridzwa zvakakodzera, uye shanduko dzakawanda dzakakosha dzakaitwa mumabikirwo emwaka.Kunyangwe ichiwedzera dosage (yezhizha formula), kushanda uye kuramba kutsemuka kuchiri kusakwanisa kuzadzisa zvinodiwa zvekushandisa, izvo zvinoda kumwe kurapwa kwakakosha kweselulosi ether, sekuwedzera dhigirii reetherification, nezvimwewo, kuitira kuti mhedzisiro yekuchengeta mvura igone kuvepo. inowanikwa pamwero wekushisa wakanyanya.Inochengetedza mhedzisiro iri nani kana yakakwira, kuitira kuti inopa kuita zviri nani mumamiriro ezvinhu akaomarara.
5. Kushandisa mumatope akagadzirira-akasanganiswa
Mune yakagadzirira-yakasanganiswa dhaka, cellulose ether inotora basa rekuchengetedza mvura, kukora nekuvandudza kushanda kwekuvaka.Kuita kwakanaka kwekuchengetedza mvura kunovimbisa kuti dhaka harizokonzeresa jecha, upfu uye kuderedza simba nekuda kwekushomeka kwemvura uye kusakwana kwemvura.Iko kukora mhedzisiro inowedzera zvakanyanya kusimba kwechimiro chedhaka rakanyorova.Kuwedzerwa kwe cellulose ether kunogona kuvandudza zvakanyanya kunyorova viscosity yedhaka rakanyorova, uye ine viscosity yakanaka kune akasiyana substrates, nekudaro inovandudza madziro kuita kwedhaka rakanyorova uye kuderedza tsvina.Mukuwedzera, basa re cellulose ether muzvigadzirwa zvakasiyana rakasiyanawo.Semuenzaniso, mumatairi ekunamatira, cellulose ether inogona kuwedzera nguva yekuvhura uye kugadzirisa nguva;mumakanika yekupfapfaidza dhaka, inogona kuvandudza simba rechimiro chedhaka rakanyorova;mukuzvienzanisa, inogona kudzivirira kugadzirisa, Kupatsanura uye stratification.Nokudaro, sekuwedzera kwakakosha, cellulose ether inoshandiswa zvakanyanya muvhu rakaoma dhaka.
Nguva yekutumira: Jan-11-2023