Hydroxyethyl cellulose (HEC) ndi hydroxypropyl cellulose (HPC) ndi zinthu ziwiri zomwe zimagwiritsidwa ntchito kwambiri m'mafakitale ambiri, monga mankhwala, zodzoladzola, chakudya, ndi zomangira. Ngakhale kuti mapangidwe awo amapangidwa ndi ofanana ndipo amapangidwa poyambitsa zolowa m'malo mwa ma cellulose, ali ndi kusiyana kwakukulu kwa mankhwala, katundu wakuthupi, ndi malo ogwiritsira ntchito.
1. Kusiyana kwa kapangidwe ka mankhwala
Hydroxyethyl cellulose (HEC) imapangidwa poyambitsa gulu la hydroxyethyl (-CH₂CH₂OH) mu mphete ya shuga ya molekyulu ya cellulose. Kapangidwe kake kake kamakhala ndi ma hydroxyethyl ambiri, zomwe zimapangitsa HEC kukhala ndi kusungunuka kwamadzi bwino komanso kukhuthala.
Hydroxypropyl cellulose (HPC) imayambitsa gulu la hydroxypropyl (-CH₂CHOHCH₃) mu molekyulu ya cellulose. Chifukwa cha kukhalapo kwa gulu ili la hydroxypropyl, HPC imasonyeza makhalidwe ena omwe ndi osiyana ndi HEC. Mwachitsanzo, ali ndi digiri inayake ya hydrophobicity, zomwe zimapangitsa kuti sungunuka mu zosungunulira zina organic, monga Mowa, isopropyl mowa, etc.
2. Kusiyana kwa kusungunuka
Chimodzi mwazinthu zazikulu za HEC ndikusungunuka kwake kwamadzi, makamaka m'madzi ozizira. Chifukwa cha kukhazikitsidwa kwa magulu a hydroxyethyl, HEC imatha kupanga zomangira za haidrojeni ndi mamolekyu amadzi akasungunuka, potero amabalalitsa ndikusungunuka mwachangu. Choncho, HEC ili ndi ntchito zambiri zomwe zimagwiritsidwa ntchito m'madzi, monga zokutira madzi, zomatira, zotsukira, ndi zina zotero.
Kusungunuka kwa HPC kumakhala kovuta. Kusungunuka kwa HPC m'madzi kumakhudzidwa kwambiri ndi kutentha. Imakhala ndi kusungunuka kwabwino pa kutentha kochepa, koma gelation kapena mpweya ukhoza kuchitika pa kutentha kwakukulu. Pa nthawi yomweyo, HPC imakhalanso ndi solubility mu zosungunulira za organic (monga ethanol, isopropyl alcohol, etc.), zomwe zimapereka ubwino pazinthu zina zapadera, monga zosungunulira zochokera ku organic ndi mankhwala enaake.
3. Kusiyana thickening zotsatira ndi rheology
HEC ili ndi luso lokulitsa bwino ndipo imatha kukulitsa kukhuthala kwa yankho mu njira yamadzimadzi, motero imagwiritsidwa ntchito ngati thickener, stabilizer ndi gelling agent. Kukula kwa HEC kumakhudzidwa ndi kulemera kwa maselo ndi kuchuluka kwa m'malo. Kuchuluka kwa maselo olemera ndi apamwamba mlingo wa m'malo, ndi kukhuthala kwakukulu kwa yankho. Pa nthawi yomweyi, khalidwe la rheological la mayankho a HEC ndi pseudoplastic, ndiko kuti, pamene kumeta ubweya wa ubweya kumawonjezeka, kukhuthala kwa yankho kumachepa, zomwe zimathandiza kwambiri pakupanga mapangidwe omwe amafunikira kukhazikika komanso kuyenda bwino.
Kukhuthala kwa HPC kumakhala kofooka, koma chifukwa cha mawonekedwe ake a maselo, mayankho ake amawonetsa mawonekedwe osiyanasiyana a rheological. Mayankho a HPC nthawi zambiri amakhala ndi zinthu zamadzimadzi a Newtonian, ndiye kuti, kukhuthala kwake sikudalira kumeta ubweya wa ubweya, zomwe ndizofunikira kwambiri pamapulogalamu ena omwe amafunikira kukhuthala kofanana. Kuphatikiza apo, HPC imakhalanso ndi zinthu zabwino zopanga mafilimu, zomwe zimapangitsa kuti azigwiritsidwa ntchito kwambiri m'minda monga mankhwala ndi zokutira.
4. Kukhazikika ndi kukana kwa mankhwala
HEC imasonyeza kukhazikika kwa mankhwala mumitundu yosiyanasiyana ya pH ndipo nthawi zambiri imatha kugwira ntchito mokhazikika mu pH ya 2 mpaka 12. Choncho, HEC ndiyoyenera kugwiritsidwa ntchito pansi pa acidic ndi alkaline mikhalidwe ndipo imagwiritsidwa ntchito kwambiri mu zotsukira, zodzoladzola ndi zina.
Ngakhale HPC ili ndi kukhazikika kwa mankhwala, kusinthasintha kwake ku pH kumakhala kocheperako pang'ono, ndipo nthawi zambiri kumakhala koyenera malo osalowerera kapena ofooka acidic. Nthawi zina pomwe kupanga filimu kapena hydrophobicity kumafunika, HPC imatha kuchita bwino kwambiri chifukwa cha kapangidwe kake kapadera, monga zinthu zotulutsidwa mokhazikika kapena zopaka zamankhwala.
5. Kusiyana m'magawo ofunsira
Magawo ogwiritsira ntchito HEC makamaka akuphatikizapo:
Zida Zomangamanga: Monga thickener ndi gelling agent, HEC imagwiritsidwa ntchito kwambiri muzinthu zopangira simenti, zokutira ndi matope omanga kuti zithandizire kukonza ntchito yomanga ndi kukana madzi.
Zopaka ndi utoto: HEC imagwiritsidwa ntchito mu zokutira zokhala ndi madzi kuti zikhwime, kuyimitsa, kubalalitsa ndi kukhazikika, potero kumapangitsa kuti zokutira zitheke komanso mawonekedwe ake.
Zamankhwala atsiku ndi tsiku: Pazinthu zatsiku ndi tsiku monga zotsukira ndi shamposi, HEC imagwira ntchito ngati thickener ndi stabilizer, zomwe zimatha kusintha mawonekedwe ndikugwiritsa ntchito kwa chinthucho.
Magawo akuluakulu ogwiritsira ntchito HPC ndi awa:
Gawo lazamankhwala: HPC imagwiritsidwa ntchito nthawi zambiri ngati zokutira komanso kukonzekera kosalekeza kwa mankhwala chifukwa cha kupanga kwake kwamakanema komanso kutulutsa kosatha. Kuonjezera apo, ilinso ndi ntchito zofunika mu zomangira piritsi.
Chakudya ndi zodzoladzola: HPC imagwiritsidwa ntchito ngati chowonjezera komanso chokometsera m'makampani azakudya, komanso ngati chopangira mafilimu muzodzola kuti zithandizire kukonza kapangidwe kazinthu komanso kukhazikika kwazinthu.
Zopaka ndi Inki: Chifukwa cha kusungunuka kwake ndi kupanga mafilimu, HPC nthawi zambiri imagwiritsidwa ntchito popaka ndi inki zomwe zimafuna zosungunulira za organic, kupereka zigawo zosalala za filimu komanso kuyenda bwino.
6. Kuteteza chilengedwe ndi chitetezo
Zonse za HEC ndi HPC zimaonedwa kuti ndi zotetezeka kwa thupi la munthu komanso chilengedwe ndipo zimagwiritsidwa ntchito kwambiri pazinthu zomwe zimafuna kukhudzana ndi thupi la munthu, monga zodzoladzola ndi mankhwala. Komabe, HPC imasungunuka muzinthu zina zosungunulira zamoyo, zomwe zingayambitse zovuta zina ku mapulogalamu omwe ali ndi zofunikira za chilengedwe, pamene HEC imagwiritsidwa ntchito makamaka m'madzi osungunuka m'madzi, kotero zimakhala zosavuta kukwaniritsa zofunikira zachilengedwe zobiriwira.
Hydroxyethyl cellulose (HEC) ndi hydroxypropyl cellulose (HPC), monga zotumphukira zama cellulose, ali ndi zofanana mu kapangidwe ka mankhwala, solubility, thickening effect, rheological properties, application fields and environment protection properties. Pali kusiyana kwakukulu muzinthu. Chifukwa cha kusungunuka kwamadzi ndi kukhuthala kwake, HEC imagwiritsidwa ntchito kwambiri popanga madzi, monga zokutira, zomangira ndi mankhwala a tsiku ndi tsiku. HPC ili ndi ntchito zapadera pazamankhwala, chakudya ndi zokutira zina zapadera chifukwa cha kusungunuka kwake, kupanga mafilimu komanso kutulutsa kosalekeza. Kusankha komwe kumachokera ku cellulose nthawi zambiri kumatengera zomwe mukufuna komanso momwe mungapangire.
Nthawi yotumiza: Oct-29-2024