Hydroxyethyl cellulose (HEC) uye hydroxypropyl cellulose (HPC) maviri akajairwa cellulose anobva anoshandiswa zvakanyanya muminda yakawanda yemaindasitiri, senge mishonga, zvizorwa, chikafu, uye zvekuvakisa. Kunyangwe zvimiro zvavo zvemakemikari zvakafanana uye zvinoumbwa nekuunza zvinotsiva pane cellulose mamorekuru, vane misiyano yakakura mumakemikari zvimiro, zvimiro zvemuviri, uye minda yekushandisa.
1. Kusiyana kwechimiro chemakemikari
Hydroxyethyl cellulose (HEC) inogadzirwa nekuunza boka rehydroxyethyl (-CH₂CH₂OH) mumhete yeglucose yemorekuru we cellulose. Chimiro chayo chemakemikari chine nhamba huru ye hydroxyethyl substituents, iyo inoita kuti HEC ive yakanaka yekunyungudika kwemvura uye kukora zvinhu.
Hydroxypropyl cellulose (HPC) inopinza hydroxypropyl (-CH₂CHOHCH₃) boka mu cellulose molecule. Nekuda kwekuvapo kweiyi hydroxypropyl boka, HPC inoratidza humwe hunhu hwakasiyana neHEC. Semuenzaniso, ine imwe dhigirii yehydrophobicity, iyo inoita kuti inyungudika mune mamwe organic solvents, senge ethanol, isopropyl doro, nezvimwe.
2. Solubility misiyano
Chimwe chezvinhu zvikuru zveHEC kunaka kwayo kunyungudika kwemvura, kunyanya mumvura inotonhora. Nekuda kwekuunzwa kwemapoka ehydroxyethyl, HEC inogona kuumba hydrogen zvisungo nemamorekuru emvura kana yanyungudutswa, nekudaro inokurumidza kupararira nekunyungudika. Nokudaro, HEC ine zvakawanda zvakasiyana-siyana zvekushandiswa mumvura-based systems, zvakadai semvura-based coatings, adhesives, detergents, nezvimwewo.
Kunyungudika kweHPC kwakaoma. Kunyungudika kweHPC mumvura kunokanganisa zvakanyanya nekupisa. Iine yakanaka solubility pakudziya kwakadzika, asi gelation kana kunaya kunogona kuitika pakupisa kwakanyanya. Panguva imwecheteyo, HPC inewo solubility mune organic solvents (senge ethanol, isopropyl doro, nezvimwewo), iyo inopa iyo ine zvakanakira mune mamwe maapplication akakosha, senge organic solvent-based formulations uye mamwe magadzirirwo emishonga.
3. Misiyano mukukora mhedzisiro uye rheology
HEC ine yakanaka thickening kugona uye inogona zvakanyanya kuwedzera viscosity yemhinduro mune aqueous solution, saka inowanzoshandiswa seyakakura, stabilizer uye gelling agent. Iyo thickening mhedzisiro yeHEC inobatwa nehuremu hwemamorekuru uye dhigirii rekutsiva. Iyo yakakura iyo molecular uremu uye yakakwirira dhigirii yekutsiva, iyo yakakura viscosity yemhinduro. Panguva imwecheteyo, rheological maitiro eHEC solutions ndeye pseudoplastic, ndiko kuti, sezvo shear rate inowedzera, viscosity yemhinduro inoderera, iyo inobatsira zvikuru pakugadzirisa kunoda kugadzikana uye kuyerera kwakanaka.
Iko kukora mhedzisiro yeHPC haina kusimba, asi nekuda kweiyo molecular chimiro maitiro, mhinduro dzayo dzinoratidza akasiyana rheological properties. HPC mhinduro dzinowanzova neNewtonian fluid properties, kureva kuti, mhinduro viscosity yakasununguka pashear rate, iyo inonyanya kukosha mune mamwe maitiro anoda yunifomu viscosity. Pamusoro pezvo, HPC inewo yakanaka yekugadzira firimu, iyo inoita kuti ishandiswe zvakanyanya muminda yakadai semishonga uye machira.
4. Kugadzikana uye kusagadzikana kwemakemikari
HEC inoratidza kugadzikana kwekemikari yakakwirira mumhando dzakasiyana dzepH uye inowanzoshanda zvakasimba mu pH ye 2 kusvika ku 12. Nokudaro, HEC yakakodzera kushandiswa pasi pemamiriro e-acidic uye alkaline uye inoshandiswa zvakanyanya mu detergents, cosmetics nedzimwe minda.
Kunyangwe HPC iine kugadzikana kwakanaka kwemakemikari, kuchinjika kwayo kune pH kukosha kwakatetepa zvishoma, uye kazhinji yakakodzera kune kwayakarerekera kana kune isina kusimba acidic nharaunda. Mune mamwe mamiriro ezvinhu apo kuumbwa kwemafirimu kana hydrophobicity kunodiwa, HPC inogona kupa mashandiro akanaka kwazvo nekuda kwechimiro chayo chakakosha, senge chinhu chakaburitswa-chakaburitswa kana chinoputira chemishonga.
5. Misiyano mundima dzekushandisa
Nzvimbo dzekushandisa dzeHEC dzinonyanya kusanganisira:
Zvishandiso Zvokuvaka: Sezvinoita thickener uye gelling agent, HEC inoshandiswa zvakanyanya musimende-based materials, machira uye matope ekuvaka kubatsira kuvandudza kushanda kwekuvaka uye kudzivirira mvura.
Coatings uye pendi: HEC inoshandiswa mumvura-based coatings kukora, kumisa, kuparadzira uye kudzikamisa, nekudaro kuvandudza kushanda kwejasi uye kutaridzika.
Zvigadzirwa zvemakemikari zvemazuva ese: Muzvigadzirwa zvemazuva ese zvemakemikari senge detergents uye shampoos, HEC inoshanda seyakakora uye yakagadzikana, iyo inogona kuvandudza magadzirirwo uye mashandisiro echigadzirwa.
Nzvimbo huru dzekushandisa dzeHPC dzinosanganisira:
Pharmaceutical field: HPC inowanzoshandiswa sechinhu chekuputira uye inoenderera-kuburitswa gadziriro yemishonga nekuda kweakanakisa firimu-kuumba uye inosimudzira-kuburitsa zvivakwa. Pamusoro pezvo, ine zvakare yakakosha maapplication mune mahwendefa ekubatanidza.
Chikafu uye zvizorwa: HPC inoshandiswa seyakakora uye emulsifier muindasitiri yechikafu, uye semugadziri wekugadzira firimu mune zvizorwa kubatsira kuvandudza magadzirirwo uye ductility yezvigadzirwa.
Coatings uye Inks: Nekuda kwekunyungudika kwayo uye firimu-kugadzira zvimiro, HPC inowanzoshandiswa mukuvhara uye inki magadzirirwo anoda organic solvents, achipa akatsetseka firimu akaturikidzana uye yakanaka kuyerera.
6. Kuchengetedzwa kwezvakatipoteredza uye kuchengeteka
Ose ari maviri HEC neHPC anoonekwa sezvinhu zvakachengeteka zvemuviri wemunhu uye nharaunda uye anoshandiswa zvakanyanya muzvigadzirwa zvinoda kubata nemuviri wemunhu, senge zvizorwa nemishonga. Nekudaro, HPC inonyungudika mune mamwe organic solvents, ayo anogona kuunza mamwe matambudziko kune maapplication ane yakakwirira yezvakatipoteredza zvinodiwa, nepo HEC inonyanya kushandiswa mumvura-soluble formulations, saka zviri nyore kuzadzisa zvakasvibirira zvakatipoteredza zvinodiwa.
Hydroxyethyl cellulose (HEC) uye hydroxypropyl cellulose (HPC), sezvinobva muselulosi, zvine zvakafanana muchimiro chemakemikari, solubility, thickening effect, rheological properties, minda yekushandisa uye kuchengetedzwa kwezvakatipoteredza. Pane misiyano yakakura muzvikamu. Nekuda kwekunakisa kunyungudika kwemvura uye kukora zvivakwa, HEC inoshandiswa zvakanyanya mukuumbwa kwemvura, senge machira, zvivakwa zvekuvaka uye zvigadzirwa zvemazuva ese zvemakemikari. HPC ine yakasarudzika mashandisirwo mumishonga, chikafu uye mamwe machira akakosha nekuda kwekunyungudika kwayo, kugadzira firimu uye kuburitswa-kuburitswa zvivakwa. Sarudzo yekuti ndeipi inobva ku cellulose yekushandisa inowanzoenderana nezvinodiwa zvekushandisa uye zvinodiwa zvekugadzira.
Nguva yekutumira: Oct-29-2024