Hydroxypropyl Methylcellulose (HPMC) ndiMa cellulose a Hydroxyethyl (HEC) zonsezi ndi zochokera ku cellulose, zomwe zimagwiritsidwa ntchito kwambiri m'makampani, zamankhwala, zodzoladzola ndi zina. Kusiyana kwawo kwakukulu kumawonekera mu kapangidwe ka maselo, mawonekedwe a solubility, magawo ogwiritsira ntchito ndi zina.
1. Mapangidwe a mamolekyu
Hydroxypropyl Methylcellulose (HPMC)
HPMC ndi chochokera m'madzi chosungunuka chomwe chimayambitsidwa poyambitsa magulu a methyl (-CH3) ndi hydroxypropyl (-CH2CHOHCH3) mu tcheni cha cellulose. Mwachindunji, mawonekedwe a mamolekyu a HPMC ali ndi zolowa ziwiri zogwira ntchito, methyl (-OCH3) ndi hydroxypropyl (-OCH2CH(OH)CH3). Nthawi zambiri, chiŵerengero choyambirira cha methyl chimakhala chokwera, pamene hydroxypropyl imatha kusintha bwino kusungunuka kwa cellulose.
Ma cellulose a Hydroxyethyl (HEC)
HEC ndi chotuluka chomwe chinayambitsidwa poyambitsa magulu a ethyl (-CH2CH2OH) mu unyolo wa cellulose. Mu kapangidwe ka cellulose ya hydroxyethyl, gulu limodzi kapena angapo a hydroxyl (-OH) a cellulose amasinthidwa ndi magulu a ethyl hydroxyl (-CH2CH2OH). Mosiyana ndi HPMC, mamolekyu a HEC ali ndi gawo limodzi lokha la hydroxyethyl ndipo alibe magulu a methyl.
2. Kusungunuka kwamadzi
Chifukwa cha kusiyana kwamapangidwe, kusungunuka kwamadzi kwa HPMC ndi HEC ndi kosiyana.
HPMC: HPMC ili ndi kusungunuka kwamadzi kwabwino, makamaka pa pH ya ndale kapena yamchere pang'ono, kusungunuka kwake kuli bwino kuposa HEC. Kukhazikitsidwa kwa magulu a methyl ndi hydroxypropyl kumawonjezera kusungunuka kwake komanso kumatha kuwonjezera kukhuthala kwake polumikizana ndi mamolekyu amadzi.
HEC: HEC nthawi zambiri imasungunuka m'madzi, koma kusungunuka kwake kumakhala kosauka, makamaka m'madzi ozizira, ndipo nthawi zambiri kumafunika kusungunuka pansi pa kutentha kapena kumafuna kukhazikika kwakukulu kuti akwaniritse zotsatira zofanana za viscosity. Kusungunuka kwake kumagwirizana ndi kusiyana kwa mapangidwe a cellulose ndi hydrophilicity ya gulu la hydroxyethyl.
3. Viscosity ndi rheological katundu
HPMC: Chifukwa cha kukhalapo kwa magulu awiri osiyana a hydrophilic (methyl ndi hydroxypropyl) m'mamolekyu ake, HPMC ili ndi machitidwe abwino osinthira kukhuthala m'madzi ndipo amagwiritsidwa ntchito kwambiri mu zomatira, zokutira, zotsukira, zopangira mankhwala ndi zina. Pazigawo zosiyanasiyana, HPMC imatha kusintha kuchokera ku viscosity otsika kupita ku viscosity yayikulu, ndipo kukhuthala kumakhudzidwa kwambiri ndi kusintha kwa pH.
HEC: The mamasukidwe akayendedwe a HEC angasinthidwenso mwa kusintha ndende, koma kukhuthala kwake kusinthika kwamitundu yosiyanasiyana ndi yopapatiza kuposa ya HPMC. HEC imagwiritsidwa ntchito makamaka pamikhalidwe yomwe kukhuthala kotsika mpaka kwapakatikati kumafunikira, makamaka pakumanga, zotsukira ndi zinthu zosamalira anthu. Ma rheological properties a HEC amakhala okhazikika, makamaka m'madera acidic kapena osalowerera ndale, HEC ikhoza kupereka kukhuthala kokhazikika.
4. Minda yofunsira
Hydroxypropyl methylcellulose (HPMC)
Makampani omanga: HPMC imagwiritsidwa ntchito kwambiri mumatope a simenti ndi zokutira m'makampani omanga kuti apititse patsogolo madzi, kugwira ntchito komanso kupewa ming'alu.
Makampani opanga mankhwala: Monga wothandizira kutulutsa mankhwala, HPMC imagwiritsidwa ntchito kwambiri m'makampani opanga mankhwala. Sizingagwiritsidwe ntchito ngati chopangira mapiritsi ndi makapisozi, komanso ngati zomatira kuti zithandize kutulutsa mankhwala mofanana.
Makampani azakudya: HPMC imagwiritsidwa ntchito nthawi zambiri pokonza chakudya ngati chokhazikika, chokhuthala kapena emulsifier kuwongolera mawonekedwe ndi kukoma kwa chakudya.
Makampani opanga zodzoladzola: Monga chowonjezera, HPMC imagwiritsidwa ntchito kwambiri pazinthu monga mafuta opaka, ma shampoos, ndi zoziziritsa kukhosi kuti ziwonjezere kukhuthala komanso kukhazikika kwazinthuzo.
Hydroxyethyl cellulose (HEC)
Makampani omanga: HEC imagwiritsidwa ntchito nthawi zambiri mu simenti, gypsum, ndi zomatira matailosi kuti apititse patsogolo kuchuluka kwa madzi ndi nthawi yosungira zinthu.
Oyeretsa: HEC imagwiritsidwa ntchito nthawi zambiri poyeretsa m'nyumba, zotsukira zovala ndi zinthu zina kuti awonjezere kukhuthala kwazinthu ndikuwongolera kuyeretsa.
Makampani opanga zodzoladzola: HEC imagwiritsidwa ntchito kwambiri pazinthu zosamalira khungu, ma gels osambira, ma shampoos, ndi zina zotere monga chowonjezera komanso choyimitsa chothandizira kukonza mawonekedwe ndi kukhazikika kwa mankhwalawa.
Kutulutsa mafuta: HEC itha kugwiritsidwanso ntchito pochotsa mafuta ngati chowonjezera mumadzi opangira madzi kuti athandizire kukulitsa kukhuthala kwamadzimadzi ndikuwongolera momwe kubowola.
5. pH kukhazikika
HPMC: HPMC imakhudzidwa kwambiri ndi kusintha kwa pH. Pansi acidic zinthu, kusungunuka kwa HPMC kumachepa, zomwe zingakhudze ntchito yake. Choncho, nthawi zambiri amagwiritsidwa ntchito mopanda ndale kapena pang'ono zamchere.
HEC: HEC imakhalabe yokhazikika pamitundu yambiri ya pH. Lili ndi mphamvu yosinthika kumadera a acidic ndi amchere, choncho amagwiritsidwa ntchito nthawi zambiri popanga mapangidwe omwe amafunikira kukhazikika kwamphamvu.
Mtengo wa HPMCndiHECamasiyana mu kapangidwe ka maselo, solubility, viscosity kusintha magwiridwe antchito, ndi madera ntchito. HPMC ili ndi kusungunuka kwamadzi kwabwino komanso kusinthika kwa viscosity, ndipo ndiyoyenera kugwiritsa ntchito zomwe zimafunikira kukhuthala kwakukulu kapena magwiridwe antchito oyendetsedwa bwino; pomwe HEC ili ndi kukhazikika kwa pH yabwino komanso magwiridwe antchito osiyanasiyana, ndipo ndiyoyenera pazochitika zomwe zimafuna kukhuthala kwapakatikati ndi kotsika komanso kusinthika kwamphamvu kwachilengedwe. Muzogwiritsira ntchito zenizeni, kusankha kwazinthu zomwe ziyenera kuyesedwa malinga ndi zosowa zenizeni.
Nthawi yotumiza: Feb-24-2025