Cellulose ethersimhuri yemapolymer anonyungudika mumvura anobva ku cellulose, iyo polymer yechisikigo yakawanda inowanikwa mumadziro emasero emiti. Aya mapolymer akagadziriswa ane mashandisirwo akasiyana-siyana emaindasitiri nemabhizimisi, kusanganisira kushandiswa mukuvaka, mishonga, chikafu, zvizoro, uye pendi. Maitiro ekugadzira cellulose ethers anosanganisira kugadziriswa kwemakemikari kwe cellulose yechisikigo kuti ivandudze kunyungudika kwayo, kugadzikana kwekupisa, kudzora viscosity, uye kushanda kwakasiyana-siyana.
1. Zvinhu Zvisina Kugadzirwa: Cellulose Yechisikigo
Chinhu chikuru chinoshandiswa mukugadzira cellulose ether icellulose yakacheneswa, inowanzo kuwanikwa kubva ku:
Huni dzakagadzirwa nematanda (huni dzakaoma kana huni dzakapfava)
Machira edonje (akachena zvakanyanya)
Cellulose ipolysaccharide inoumbwa nemaketani akatsetseka emayuniti eβ-D-glucose akabatanidzwa nemabhondi eβ-1,4-glycosidic. Mapoka ehydroxyl (–OH) ari pamayuniti eglucose anoita kuti cellulose ive inoshanda zvakanyanya uye yakakodzera kugadziriswa kwemakemikari.
2. Kupatsanurwa kweCellulose Ethers
MaCellulose ethers anopiwa mazita zvichibva pane zvinotsiva zvakaiswa mumusana we cellulose. Mhando dzakajairika dzinosanganisira:
Hydroxypropyl methylcellulose (HPMC)
Rudzi uye mwero wekutsiva zvinosarudza hunhu hwemuviri uye hwemakemikari hwechigadzirwa chekupedzisira.
3. Maitiro Akakosha Emakemikari Mukugadzirwa
Ma ether e cellulose anogadzirwa ne etherification yemapoka e hydroxyl ari pa cellulose. Maitiro acho anosanganisira maitiro maviri makuru emakemikari:
3.1. Alkalization (Nhanho yeKuita Kuti Mvura Ive Yakachena)
Danho iri rinogadzirira cellulose kuti iite etherification nekuishandura kuita alkali cellulose:
Mhinduro:
NaOH (sodium hydroxide) inopwanya hydrogen bonds uye inokwidza cellulose fibers, zvichiita kuti iwanikwe nyore nyore.
Mapoka ehydroxyl ari pa cellulose anogadzirwa kuti aumbe alkali cellulose.
3.2. Kuchinjana kweEther (Kuchinjana)
Alkali cellulose inobva yaita zvinoenderana nezvinhu zvinopisa, zvichienderana nechinhu chaunoda:
Methyl chloride (CH₃Cl) ye methyl cellulose
Ethylene oxide (C₂H₄O) kana chloroethanol ye hydroxyethyl cellulose
Propylene oxide (C₃H₆O) yemapoka ehydroxypropyl
Sodium monochloroacetate ye carboxymethyl cellulose
Muenzaniso (kuumbwa kweMC):
Muenzaniso (kuumbwa kweCMC):
Kuwanda kwekutsiva (DS - Dhigirii rekutsiva) uye rudzi rweboka reether zvinosarudza kunyungudika, viscosity, uye maitiro ekupisa e cellulose ether inobuda.
4. Maitiro Ekugadzira Cellulose Ethers
Kugadzirwa kwe ethers dze cellulose kunowanzo tevera batch kana maitiro anoenderera mberi nematanho akati wandei anodzorwa nokungwarira:
Danho 1: Kucheneswa kweCellulose
Cellulose isina kucheneswa inocheneswa uye inocheneswa kuti ibvise lignin, hemicellulose, uye tsvina.
Inoomeswa yogayiwa kuita upfu hwakatsetseka kuti iite zviri nani.
Danho rechipiri: Alkalization
Cellulose inosanganiswa ne sodium hydroxide solution.
Tembiricha inochengetwa pakati pe20°C ne40°C kudzora reactivity.
Maitiro aya anoshandura cellulose kuita alkali cellulose.
Danho rechitatu: Maitiro eEtherification
Chinhu chinopa simba rekupisa chinowedzerwa pasi pekumanikidzwa uye tembiricha inodzorwa.
Mamiriro ekuita (tembiricha, nguva, pH, uye huwandu hwe reagent) akagadzirirwa zvinodiwa kuti chigadzirwa chienderane nezvinodiwa.
Zvigadzirwa zvakaita seNaCl, methanol, kana glycol zvinogadzirwa, izvo zvinofanirwa kubviswa gare gare.
Danho rechina: Kusapindirana
Alkali isina kugadziriswa inobviswa nekushandisa maasidhi akaita seacetic acid kana hydrochloric acid.
Danho iri rinodzikamisa chigadzirwa uye rinodzivirira mamwe maitiro asingadiwe.
Danho rechishanu: Kugeza
Chinhu chisina kuchena chinogezwa kakawanda nemvura, doro, kana acetone.
Izvi zvinobvisa zvimwe zvinhu, zvinosara, uye munyu.
Kusefa kana kutenderera kunogona kushandiswa kuparadzanisa zvinhu zvakasimba.
Danho rechitanhatu: Kuomesa
Keke rakanyorova rinoomeswa mumichina yekuomesa inotenderera, mumichina yekuomesa yemubhedha ine mvura, kana mumichina yekuomesa yemabhandi.
Kupisa kwekuoma kunodzorwa nokungwarira kudzivirira kuora.
Danho rechinomwe: Kukuya uye Kuchera
Chigadzirwa chakaomeswa chinokuyiwa kuita upfu hwakatsetseka.
Kugoverwa kwehukuru hwezvikamu kunogadziriswa zvichienderana nezvinodiwa nemushandisi wekupedzisira.
Danho rechisere: Kurongedza
Chigadzirwa chekupedzisira chinoiswa mumabhegi kana mumidziyo isinganyorovese mvura.
Mamiriro ekuchengetera anofanira kunge akaoma uye achitonhorera kuti achengetedze hunhu.
5. Kudzora Hunhu uye Kugadzirisa
Zviyero zvemhando yepamusoro zvakaita sekusimba, mwero wekutsiva, hunyoro, pH, uye saizi yezvikamu zvinoedzwa pamatanho akasiyana-siyana. Chigadzirwa ichi chinogonawo kugadziriswa kuti chiite zvinotevera:
Kukurumidza kana kunonoka kuparadzwa
Mhando dzakasiyana dze viscosity (dziri pasi kusvika pakakwirira)
Kushivirira munyu
Kurapa pamusoro (semuenzaniso, kubatanidza pamusoro kuti mvura igare yakanonoka)
6. Kufunga Nezvezvakatipoteredza
Kugadzirwa kwe cellulose ethers kunosanganisira kubata makemikari anoshanduka kuita organic (VOCs), alkalis, uye zvimwe zvinhu. Vagadziri vane mutoro vanoisa mari mu:
Masisitimu ekubata nekurapa maVOC
Masisitimu ekusuka nekudzorera zvinhu akavharika
Kurasa kana kushandisazve munyu zvakachengeteka
Midziyo yekuomesa nekugadzira isingadyi simba zvakanyanya
Dzimwe nzira dzinoshanda zvakanaka pakuchengetedza nharaunda uye hunyanzvi hwemakemikari egirini huri kuongororwa kuti kugadzirwa kwe cellulose ether kuve kwakasimba.
7. Mashandisirwo eCellulose Ethers
Nekuda kwehunhu hwadzo hunoshandiswa zvakasiyana-siyana (kukora, kudzikamisa, kusunga, kugadzira firimu, emulsifying, kuchengetedza mvura), cellulose ethers dzinoshandiswa mu:
7.1. Kuvaka
Zvinonamira mataira, mapendero, maplasta esimende, makemikari anozvienzanisa ega
Zvinochengetedza mvura uye zvinovandudza kushanda kwayo
7.2. Mishonga
Zvisungo zvemapiritsi uye zvinopwanyika
Matrices anodzorwa-anosunungurwa
7.3. Bhizinesi rezvekudya
Zvinoita kuti zviome mumasosi, madhizeti, uye dzimwe nzira dzemukaka
Zvinotsiva mafuta muzvikafu zvine macalorie mashoma
7.4. Zvizoro uye Kutarisirwa Kwemunhu
Mafuta ekuzora, makirimu, shampoo, uye majeli ekugadzira uye kugadzikana kweganda
7.5. Pendi neMapendi
Zvinogadzirisa rheology mumapendi anobva mumvura
Zvinodzivirira kudonha uye kufambisa mabhurashi
7.6. Kuchera Oiri
Kudzora kurasikirwa kwemvura mumadhaka ekuboorera
Kuzora mumvura dzinopwanyika
Kugadzirwa kwe cellulose ethers inzira yemakemikari yakagadzirwa zvakanaka inoshandura cellulose yakawanda yechisikigo kuita mapolymer anoshanda zvakanaka. Kubva pahuni kana donje, kuburikidza ne alkaliization uye etherification, kusvika kuchinhu chekupedzisira chakacheneswa uye chakaomeswa, danho rega rega rinogadziriswa kuti chive chakachengeteka, chinoshanda zvakanaka, uye mhando yechigadzirwa. Zvinhu izvi zvinoshandiswa zvakasiyana-siyana zvakakosha mumaindasitiri akasiyana-siyana, nekuda kwemusanganiswa wazvo wezvisikwa zvechisikigo uye mashandiro azvo ekugadzira. Nekusimbiswa kuri kukura kwezvinhu zvinoora uye zvinogara kwenguva refu,Ma ether e cellulose anoramba achiita basa guru mune ramangwana re green chemistry nezvinhu zvepamusoro.
Nguva yekutumira: Chikunguru-11-2025