Cellulose ethers imhando inonakidza yemakomichi anobva kucellulose, imwe yemapolymer echisikigo akawanda kwazvo pasi pano. Zvinhu izvi zvinoshandiswa zvakasiyana-siyana mumaindasitiri akasiyana-siyana, anosanganisira mishonga, chikafu, zvizoro, kuvaka, uye machira, nekuda kwehunhu hwazvo hwakasiyana uye mashandiro azvo.
1. Maumbirwo uye Hunhu hweCellulose:
Cellulose ipolysaccharide ine cheni refu dzemayuniti eglucose akabatana pamwe chete ne β(1→4) glycosidic bonds. Mayuniti eglucose anodzokorora anopa cellulose chimiro chakatwasuka uye chakasimba. Kurongeka uku kwechimiro kunoita kuti hydrogen ibatane zvakasimba pakati pecheni dziri pedyo, zvichibatsira mukuita zvakanaka kwe cellulose.
Mapoka ehydroxyl (-OH) ari mu cellulose chain anoita kuti ive inonyungudika zvakanyanya, zvichiita kuti ikwanise kunyungudutsa uye kuchengetedza mvura yakawanda. Zvisinei, cellulose haina kunyungudika zvakanaka muzvinhu zvakawanda zvinokonzerwa ne organic solvents nekuda kwe network yayo yakasimba ye hydrogen bonding.
2. Nhanganyaya kuCellulose Ethers:
Cellulose ethers zvinobva mu cellulose umo mamwe mapoka ehydroxyl anotsiviwa nemapoka e ether (-OR), uko R inomiririra zvakasiyana-siyana zvinotsiva organic. Kuchinja uku kunoshandura hunhu hwe cellulose, zvichiita kuti inyungudike zvakanyanya mumvura uye mune organic solvents ukuwo ichichengetedza humwe hunhu hwayo, hwakadai sekuora kwehupenyu uye kusakuvadza.
3. Kugadzirwa kweCellulose Ethers:
Kugadzirwa kwe cellulose ethers kunowanzo sanganisira etherification ye cellulose hydroxyl groups nema reagents akasiyana-siyana pasi pemamiriro ekudzora. Ma reagents anoshandiswa pa etherification anosanganisira alkyl halides, alkylene oxides, uye alkyl halides. Mamiriro ekuita senge tembiricha, solvent, uye catalysts anoita basa rakakosha pakuona dhigirii rekutsiva (DS) uye hunhu hwe cellulose ether inobuda.
4. Mhando dzeCellulose Ethers:
Ma ether e cellulose anogona kupatsanurwa zvichienderana nerudzi rwezvinhu zvinotsiva zvakabatana nemapoka e hydroxyl. Mamwe e ether e cellulose anonyanya kushandiswa anosanganisira:
Methyl cellulose (MC)
Hydroxypropyl cellulose (HPC)
Hydroxyethyl cellulose (HEC)
Ethyl hydroxyethyl cellulose (EHEC)
Carboxymethyl cellulose (CMC)
Rudzi rumwe nerumwe rwe cellulose ether rune hunhu hwakasiyana uye rwakakodzera kushandiswa kwarwo zvichienderana nechimiro chayo chemakemikari uye mwero wekutsiva.
5. Hunhu uye Mashandisirwo eCellulose Ethers:
Cellulose ethers ine zvinhu zvakawanda zvinobatsira zvinoita kuti zvive zvakakosha mumabasa akasiyana-siyana:
Kukora uye Kudzikamisa: Cellulose ethers dzinoshandiswa zvakanyanya sezvinhu zvinosimbisa uye zvinosimbisa muzvikafu, mishonga, uye zvigadzirwa zvekuchengetedza munhu. Dzinovandudza kunaka uye hunhu hwe rheological hwemhinduro nema emulsions, zvichiwedzera kugadzikana uye magadzirirwo echigadzirwa.
Kugadzirwa Kwemafirimu: Cellulose ethers inogona kugadzira mafirimu anochinjika uye akajeka kana yakaparadzirwa mumvura kana mune zvinonyungudutsa zve organic. Mafirimu aya anoshandiswa mu coatings, packing, uye mu shipping drug systems.
Kuchengetedza Mvura: Hunhu hwema cellulose ethers hunoita kuti akwanise kunyudza nekuchengetedza mvura, zvichiita kuti ave zvinhu zvinokosha muzvinhu zvekuvaka zvakaita sesimende, mortar, uye gypsum. Zvinovandudza kushanda, kunamira, uye kugara kwenguva refu kwezvinhu izvi.
Kutumirwa Kwemishonga: Cellulose ethers inoshandiswa mumishonga sezvinhu zvinobatsira kudzora kuburitswa kwemishonga, kuvandudza kuwanikwa kwemishonga, uye kufukidza kunaka kana hwema husina kunaka. Inowanzoshandiswa mumapiritsi, makapisiri, mafuta ekuzora, uye suspensions.
Kugadziriswa kweUso: Cellulose ethers inogona kugadziriswa nemakemikari kuti iunze mapoka anoshanda anopa hunhu hwakadai sehutachiona, kunonoka kwemurazvo, kana kuti kuenderana nehupenyu. Aya ma ethers e cellulose akagadziriswa anoshandiswa muzvipfeko zvemhando yepamusoro, machira, uye zvishandiso zvekurapa.
6. Kukanganiswa Kwezvakatipoteredza uye Kugara Kuchienderera Mberi:
Ma ether e cellulose anobva muzvinhu zvinogona kushandiswazve zvakaita sehuni, donje, kana zvimwe zvinhu zvinomera, zvichiita kuti zvirambe zviripo kwenguva refu. Uyezve, zvinoora uye hazvina chepfu, zvichikonzera njodzi shoma kunharaunda zvichienzaniswa nema polymer ekugadzira. Zvisinei, kugadzirwa kwe ether e cellulose kunogona kusanganisira maitiro emakemikari anoda kutarisirwa nekungwarira kuderedza kushandiswa kwemarara nemagetsi.
7. Maonero Eramangwana:
Kudiwa kwe cellulose ethers kunotarisirwa kuramba kuchikura nekuda kwehunhu hwadzo hunoshandiswa zvakasiyana-siyana uye hunhu hwadzo husina njodzi kune zvakatipoteredza. Kutsvagurudza kuri kuenderera mberi kwakatarisana nekugadzira cellulose ethers itsva dzine mashandiro akawedzerwa, kugona kushandiswa kwakawedzerwa, uye hunhu hwakagadzirirwa mashandisirwo chaiwo. Uyezve, kubatanidzwa kwe cellulose ethers mune matekinoroji ari kubuda akadai se3D printing, nanocomposites, uye zvinhu zve biomedical kune vimbiso yekuwedzera kushandiswa kwadzo uye kusvika pamusika.
Ma ether e cellulose anomiririra boka rakakosha remakemikari ane mashandisirwo akasiyana-siyana muindasitiri dzakasiyana-siyana. Musanganiswa wavo wakasiyana wehunhu, kuora kwehupenyu, uye kugara kwenguva refu kunoita kuti zvive zvinhu zvakakosha muzvigadzirwa zvakasiyana-siyana uye maitiro. Kuenderera mberi kwekuvandudzwa mumakemikari e ether e cellulose kwakagadzirira kufambisa mberi mberi uye kuvhura mikana mitsva mumakore anotevera.
Nguva yekutumira: Kubvumbi-18-2024