Cellulose ethers ikirasi yakasiyana-siyana yemakomisheni inotorwa kubva ku cellulose, yakasikwa polymer inowanikwa muchirimwa sero madziro. Iwo anoshandiswa zvakanyanya mumaindasitiri akasiyana nekuda kweakasarudzika zvivakwa, kusanganisira solubility mumhando yezvinonyungudutsa. Kunzwisisa maitiro ekunyungudika kwe cellulose ethers kwakakosha pakushandisa kwavo mumishonga, chikafu, kuvaka, uye mamwe masekete.
Cellulose ethers inogadzirwa nekemikari inoshandura cellulose kuburikidza ne etherification reactions. Mhando dzakajairika dze cellulose ethers dzinosanganisira methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), uye carboxymethyl cellulose (CMC). Rudzi rwega rwega runoratidza hunhu hwakasiyana hwekunyungudika zvichienderana nechimiro chayo chemakemikari uye dhigirii rekutsiva.
Kunyungudika kwe cellulose ethers kunokonzerwa nezvinhu zvakaita sedhigirii repolymerization, dhigirii rekutsiva, huremu hwemamorekuru, uye chimiro chemapoka anotsiva. Kazhinji, macellulose ether ane madhigirii akaderera ekutsiva uye epamusoro mamorekuru huremu haanyanyi kunyungudika kana ichienzaniswa neaya ane madhigirii epamusoro ekutsiva uye epasi mamorekuru huremu.
Chimwe chezvinhu zvinonyanya kukosha zve cellulose ethers kugona kwavo kunyungudika mumhando dzakasiyana dzezvinonyungudutsa, kusanganisira mvura, organic solvents, uye zvimwe zvinwiwa zvepolar uye zvisiri-polar. Kunyungudika kwemvura chinhu chakakosha chema cellulose ether mazhinji uye chakanyanya kukosha pakushandisa mumishonga, chikafu, uye zvigadzirwa zvekuchengeta munhu.
Mvura-soluble cellulose ethers yakadai seHEC, HPC, uye CMC inoumba zvakajeka, zvinogadzirisa zvinogadzirisa kana zvakaparadzirwa mumvura. Mhinduro idzi dzinoratidza pseudoplastic maitiro, zvichireva kuti viscosity yavo inodzikira pasi pekunetseka kwekugera, zvichiita kuti ive yakakodzera kushandiswa seyakakora, inosimbisa, uye firimu-inogadzira vamiririri mune chikafu uye mishonga yekugadzira mishonga.
Kunyungudika kwe cellulose ethers muorganic solvents kunoenderana nechimiro chavo chemakemikari uye polarity yezvinonyungudutsa. Semuyenzaniso, MC neEC zvinonyungudika mumhando dzakasiyana siyana dzezvinonyungudutsa, zvinosanganisira acetone, ethanol, uye chloroform, nekuda kwekudzika kwadzo dhigirii rekutsiva uye hydrophobic hunhu. Zvinhu izvi zvinoita kuti zvive zvakakosha mumashandisirwo akadai semajasi, zvinonamira, uye inodzorwa-inoburitsa-inoburitsa zvinodhaka masisitimu.
HEC neHPC, iyo ine hydroxyethyl uye hydroxypropyl mapoka, zvichiteerana, inoratidzira kunyungudika kunyungudika mu polar organic solvents senge doro uye glycols. Aya ma cellulose ethers anowanzo shandiswa seanokora uye rheology modifiers mune cosmetic uye yemunhu kuchengetedza zvigadzirwa, pamwe nemumvura-based pendi uye machira.
CMC inonyungudika mumvura uye mamwe ma polar solvents nekuda kweiyo carboxymethyl substituents, iyo inopa kunyungudika kwemvura kune polymer cheni. Iyo inoshandiswa zvakanyanya seyakakora mumiriri, stabilizer, uye emulsifier muzvigadzirwa zvekudya, mishonga, uye maindasitiri ekushandisa.
Kunyungudika kwe cellulose ethers kunogona zvakare kukanganiswa nezvinhu zvekunze senge tembiricha, pH, uye kuvapo kwemunyu kana zvimwe zvinowedzera. Semuenzaniso, kuwedzerwa kwe electrolytes yakadai se sodium chloride kana calcium chloride inogona kuderedza kunyunguduka kwemvura-soluble cellulose ethers nekusimudzira polymer aggregation kana kunaya kwemvura.
cellulose ethers inoratidzira versatile solubility zvivakwa zvinoita kuti zvive zvakakosha zvekuwedzera mumaindasitiri akasiyana siyana. Kugona kwavo kunyungudika mumvura, organic zvinonyungudutsa, uye zvinwiwa zvepolar zvinogonesa mashandisirwo akasiyana kubva pakugadzira mishonga kusvika kune zvekuvaka. Kunzwisisa maitiro ekunyungudika kwe cellulose ethers kwakakosha pakugadzirisa mashandiro avo uye kushanda kwavo mune zvakasiyana zvigadzirwa uye maitiro.
Nguva yekutumira: Kubvumbi-24-2024