1. Nhanganyaya yeHydroxyethyl Cellulose (HEC):
Hydroxyethylcellulose imvura inonyungudika kubva kune cellulose, yakasikwa polymer inowanikwa muchirimwa sero madziro. Kugadziriswa kwe cellulose nemapoka e-hydroxyethyl kunowedzera kunyungudika kwayo mumvura uye kunopa maitiro chaiwo kuHEC, zvichiita kuti HEC ive chinhu chinokosha mumhando dzakasiyana-siyana dzekushandisa.
2. Chimiro cheHEC:
Chimiro cheHEC chinobva kune cellulose, mutsara wepolysaccharide inoumbwa nekudzokorora zvikamu zveglucose zvakabatanidzwa ne β-1,4-glycosidic bonds. Mapoka eHydroxyethyl anounzwa mumusana we cellulose kuburikidza ne etherification reaction. Degree of substitution (DS) inoreva avhareji yenhamba yemapoka ehydroxyethyl paglucose unit uye inokanganisa kunyungudika uye viscosity yeHEC.
3. Hunhu hweHEC:
A. Kunyungudika kwemvura: Chimwe chezvinhu zvakakosha zveHEC ndeyekunyungudika kwayo kwemvura, iyo inonzi inonzi hydroxyethyl substitution. Ichi chivakwa chinoita kuti zvive nyore kugadzira mhinduro uye dispersions inokodzera akasiyana ekushandisa.
b. Kukora kugona: HEC inozivikanwa zvakanyanya nekuda kwekukora kwayo zvivakwa mune aqueous mhinduro. Kana yakaparadzirwa mumvura, inoumba gel yakajeka uye viscous, ichiita kuti ive yakakodzera kune zvikumbiro zvinoda viscosity control.
C. pH Kugadzikana: HEC inoratidza kugadzikana pamusoro pehupamhi hwepH, ichiita kuti ienderane nekugadzirisa mune zvose acidic uye alkaline environments.
d. Kugadzikana kwekushisa: HEC mhinduro dzinoramba dzakagadzikana pamusoro pehupamhi hwekushisa. Ivo vanogona kupinda akawanda ekudziya uye kutonhora matenderedzwa pasina akakosha shanduko mune viscosity kana zvimwe zvivakwa.
e. Magadzirirwo emafirimu: HEC inogona kuumba anochinjika uye akajeka mafirimu akakodzera kunyorera senge machira, anonamira uye mafirimu.
F. Surface Activity: HEC ine surfactant-sezvivakwa, izvo zvinobatsira mumaapplication anoda kugadziridzwa kwepamusoro kana kudzikamiswa.
4.Synthesis yeHEC:
Kugadzirwa kweHEC kunosanganisira etherification reaction ye cellulose ine ethylene oxide pamberi peiyo alkaline catalyst. Maitiro acho anogona kudzorwa kuti awane iyo inodiwa dhigirii yekutsiva, nekudaro ichikanganisa ekupedzisira zvimiro zveHEC chigadzirwa. Synthesis inowanzoitwa pasi pemamiriro ezvinhu anodzorwa kuti ive nechokwadi chekuenderana kwechigadzirwa uye mhando.
5. Kushandiswa kweHEC:
A. Paints and Coatings: HEC inoshandiswa zvakanyanya seyakakora mumvura-based pendi uye machira. Inovandudza rheology, inowedzera brushability, uye inobatsira pakuumbwa kugadzikana.
b. Zvigadzirwa zvekuchengeta wega: HEC chinhu chakajairika muzvigadzirwa zvekuchengeta zvega senge shampoos, lotions uye makirimu. Iyo inoshanda seyakakora, inosimbisa uye firimu-inogadzira mumiriri, inovandudza kuita kwese kweizvi magadzirirwo.
C. Pharmaceutical: Mumushonga wemishonga, HEC inoshandiswa mumuromo uye zvinyorwa zvinyorwa. Inogona kushanda sebhainda, disintegrant, kana matrix yaimbove mukuumbwa kwepiritsi, uye sechinogadzirisa viscosity mune topical gels uye makirimu.
d. Zvishandiso zvekuvaka: HEC inoshandiswa muindasitiri yekuvaka semugadziri wekuchengetedza mvura mune simende-based formulations. Inonatsiridza kuita kwekuvaka, inowedzera nguva yakavhurika, uye inosimudzira kunamatira kwematairi anonamira uye dhaka.
e. Indasitiri yeOiri neGasi: HEC inoshandiswa muindasitiri yemafuta uye gasi seyakakora mumiriri wekuchera mvura. Inobatsira kudzora viscosity uye inopa kumisa zvivakwa kudzivirira zvimedu kubva pakugadzirisa.
F. Indasitiri Yezvekudya: HEC inoshandiswa mumhizha yezvokudya sechinhu chakakora, stabilizer uye gelling agent mune zvakasiyana-siyana zvezvigadzirwa, kusanganisira sauces, dressings uye desserts.
6. Regulatory kufunga:
HEC inowanzo zivikanwa seyakachengeteka (GRAS) nemasangano anodzora uye kushandiswa kwayo mumhando dzakasiyana dzekushandisa kunodzorwa kuti ive nechokwadi chekuchengetedzwa kwevatengi uye kushanda kwechigadzirwa. Vagadziri vanofanirwa kutevedzera mirairo yedunhu uye kuwana mvumo inodiwa yezvikumbiro zvakananga.
7. Mafambiro uye hutsva:
Tsvagiridzo inoenderera inotarisa mukugadzirwa kweakagadziridzwa HEC anobva kune akakwidziridzwa zvivakwa kune chaiwo maapplication. Kune zvakare kuwedzera kutarisisa kune hunyanzvi mukutsvagisa uye nzira dzekugadzira kugadzirisa nyaya dzezvakatipoteredza uye kusimudzira dzimwe nzira dzine hushamwari.
Hydroxyethylcellulose (HEC) i polymer inoshanda zvakasiyana-siyana, ine zvinhu zvakasiyana-siyana zvakadai sekunyungudika kwemvura, kugona kukora, uye kugadzikana kwekushisa. Kubva papendi uye machira kusvika kumaindasitiri emishonga uye ezvekudya, HEC inoita basa rakakosha mukuvandudza mashandiro ezvigadzirwa zvakasiyana. Sezvo tsvakiridzo nebudiriro ichienderera mberi, HEC ingangoramba iri mutambi akakosha mumaindasitiri akasiyana, ichibatsira mukufambisira mberi kwezvinhu uye magadzirirwo.
Nguva yekutumira: Zvita-29-2023