Ma cellulose a Hydroxyethyl (HEC) ndi hydroxypropyl cellulose (HPC) ndi zinthu ziwiri zomwe zimagwiritsidwa ntchito kwambiri ndi cellulose. Ali ndi kusiyana kwakukulu pamapangidwe, machitidwe ndi ntchito.
1. Kapangidwe ka mankhwala
Hydroxyethyl cellulose (HEC): Hydroxyethyl cellulose imapangidwa poyambitsa gulu la hydroxyethyl (-CH₂CH₂OH) pa molekyulu ya cellulose. Gulu la hydroxyethyl limapatsa HEC kusungunuka kwabwino komanso kukhazikika.
Hydroxypropyl Cellulose (HPC): Ma cellulose a Hydroxypropyl amapangidwa poyambitsa gulu la hydroxypropyl (-CH₂CHOHCH₃) pa molekyulu ya cellulose. Kuyambitsidwa kwa magulu a hydroxypropyl kumapereka HPC kusungunuka kosiyanasiyana komanso mawonekedwe a viscosity.
2. Kusungunuka
HEC: Hydroxyethylcellulose ali solubility wabwino m'madzi ndipo akhoza kupanga mandala njira colloidal. Kusungunuka kwake kumadalira kuchuluka kwa m'malo mwa magulu a hydroxyethyl (mwachitsanzo, kuchuluka kwa magulu a hydroxyethyl pagawo la shuga).
HPC: Ma cellulose a Hydroxypropyl amakhala ndi kusungunuka kwina m'madzi ndi zosungunulira za organic, makamaka mu zosungunulira za organic monga ethanol. Kusungunuka kwa HPC kumakhudzidwa kwambiri ndi kutentha. Pamene kutentha kumawonjezeka, kusungunuka kwake m'madzi kudzachepa.
3. Viscosity ndi rheology
HEC: Hydroxyethyl cellulose imakhala ndi kukhuthala kwakukulu m'madzi ndipo imawonetsa mawonekedwe amadzimadzi a pseudoplastic, mwachitsanzo, kumeta ubweya wa ubweya. Akameta ubweya wa ubweya, kukhuthala kwake kumachepa, zomwe zimapangitsa kuti zikhale zosavuta kugwiritsa ntchito ndikugwiritsa ntchito.
HPC: Ma cellulose a Hydroxypropyl ali ndi mawonekedwe otsika kwambiri ndipo amawonetsa pseudoplasticity yofanana mu yankho. Mayankho a HPC amathanso kupanga ma colloid owonekera, koma kukhuthala kwawo kumakhala kotsika kuposa HEC.
4. Malo ogwiritsira ntchito
HEC: Ma cellulose a Hydroxyethyl amagwiritsidwa ntchito kwambiri popaka, zomangira, zodzoladzola, zotsukira ndi zina. Monga thickener, stabilizer ndi suspending wothandizira, akhoza bwino kulamulira mamasukidwe akayendedwe ndi rheology dongosolo. Mu utoto ndi zokutira, HEC imalepheretsa kukhazikika kwa pigment ndikuwongolera kuyanika.
HPC: Ma cellulose a Hydroxypropyl amagwiritsidwa ntchito kwambiri muzamankhwala, chakudya, zodzoladzola ndi zina. M'makampani opanga mankhwala, HPC imagwiritsidwa ntchito ngati chomangira komanso chowongolera chotulutsa mapiritsi. M'makampani azakudya, amatha kugwiritsidwa ntchito ngati thickener ndi emulsifier. Chifukwa cha kusungunuka kwake mu zosungunulira za organic, HPC imagwiritsidwanso ntchito popaka zinthu zina ndi nembanemba.
5. Kukhazikika ndi kukhazikika
HEC: Ma cellulose a Hydroxyethyl ali ndi kukhazikika kwamankhwala abwino komanso kukhazikika, sangatengeke ndi kusintha kwa pH, ndipo amakhalabe okhazikika pakusungidwa. HEC imakhalabe yokhazikika pansi pa ma pH apamwamba komanso otsika.
HPC: Ma cellulose a Hydroxypropyl amakhudzidwa ndi kusintha kwa kutentha ndi pH, ndipo amakonda kutsekemera makamaka kutentha kwambiri. Kukhazikika kwake kumakhala bwino pansi pa acidic, koma kukhazikika kwake kudzachepetsedwa pansi pamikhalidwe yamchere.
6. Chilengedwe ndi kuwonongeka kwa chilengedwe
HEC: Hydroxyethyl cellulose ndi yochokera ku cellulose yachilengedwe, ili ndi biodegradability yabwino komanso yosunga zachilengedwe.
HPC: Hydroxypropyl cellulose ndi chinthu chowola, koma machitidwe ake owonongeka amatha kukhala osiyana chifukwa cha kusungunuka kwake komanso kusiyanasiyana kwa ntchito.
Ma cellulose a Hydroxyethyl ndi hydroxypropyl cellulose ndi zinthu ziwiri zofunika kwambiri zochokera ku cellulose. Ngakhale onsewa amatha kukhuthala, kukhazikika ndikupanga ma colloids, chifukwa cha kusiyana kwamapangidwe, amasiyana pakusungunuka, kukhuthala, ndi magawo ogwiritsira ntchito. Pali kusiyana kwakukulu pakukhazikika. Kusankha komwe kumachokera ku cellulose kumatengera zomwe mukufuna komanso momwe mungagwiritsire ntchito.
Nthawi yotumiza: Aug-08-2024