Hydroxypropyl Methylcellulose (HPMC)ndiMethylcellulose (MC)ndi zotumphukira ziwiri za cellulose, zomwe zimakhala ndi kusiyana kwakukulu pamapangidwe amankhwala, katundu ndi ntchito. Ngakhale mapangidwe awo a mamolekyu ndi ofanana, onse amapezedwa ndi kusintha kwa mankhwala osiyanasiyana ndi mapadi ngati mafupa oyambira, koma katundu wawo ndi ntchito zake ndizosiyana.
1. Kusiyana kwa kapangidwe ka mankhwala
Methylcellulose (MC): Methylcellulose imapezeka poyambitsa magulu a methyl (-CH₃) mu mamolekyu a cellulose. Kapangidwe kake ndikuyambitsa magulu a methyl m'magulu a hydroxyl (-OH) a ma cellulose, nthawi zambiri m'malo mwa gulu limodzi kapena angapo a hydroxyl. Kapangidwe kameneka kamapangitsa MC kukhala ndi kusungunuka kwamadzi ndi kukhuthala, koma mawonetseredwe enieni a solubility ndi katundu amakhudzidwa ndi kuchuluka kwa methylation.
Hydroxypropyl Methylcellulose (HPMC): HPMC ndi chinthu china chosinthidwa cha methylcellulose (MC). Pamaziko a MC, HPMC imayambitsa magulu a hydroxypropyl (-CH₂CH(OH)CH₃). Kumayambiriro kwa hydroxypropyl kumathandizira kwambiri kusungunuka kwake m'madzi ndikuwongolera kukhazikika kwake kwamafuta, kuwonekera ndi zinthu zina zakuthupi. HPMC ili ndi magulu onse a methyl (-CH₃) ndi hydroxypropyl (-CH₂CH(OH)CH₃) pamapangidwe ake amankhwala, motero imakhala yosungunuka m'madzi kuposa MC yoyera ndipo imakhala ndi kukhazikika kwamafuta.
2. Kusungunuka ndi hydration
Kusungunuka kwa MC: Methylcellulose imakhala ndi kusungunuka kwina m'madzi, ndipo kusungunuka kumadalira mlingo wa methylation. Nthawi zambiri, methylcellulose imakhala ndi kusungunuka kochepa, makamaka m'madzi ozizira, ndipo nthawi zambiri ndikofunikira kutenthetsa madzi kuti apititse patsogolo kusungunuka kwake. The kusungunuka MC ali apamwamba mamasukidwe akayendedwe, amenenso ndi mbali yofunika mu ntchito zambiri mafakitale.
Kusungunuka kwa HPMC: Mosiyana, HPMC ili ndi kusungunuka kwamadzi bwino chifukwa choyambitsa hydroxypropyl. Ikhoza kusungunuka mofulumira m'madzi ozizira, ndipo kusungunuka kwake kumakhala mofulumira kuposa MC. Chifukwa cha mphamvu ya hydroxypropyl, kusungunuka kwa HPMC sikungowonjezereka m'madzi ozizira, komanso kukhazikika kwake ndi kuwonekera pambuyo pa kusungunuka kumasinthidwa. Chifukwa chake, HPMC ndiyabwino kwambiri pazogwiritsa ntchito zomwe zimafunikira kutha mwachangu.
3. Kukhazikika kwa kutentha
Kukhazikika kwamafuta a MC: Methylcellulose ali ndi kusakhazikika kwamafuta. Kusungunuka kwake ndi kukhuthala kwake kudzasintha kwambiri pa kutentha kwakukulu. Kutentha kukakhala kokwera, magwiridwe antchito a MC amakhudzidwa mosavuta ndi kuwonongeka kwamafuta, chifukwa chake kugwiritsa ntchito kwake m'malo otentha kwambiri kumakhala ndi zoletsa zina.
Kukhazikika kwa kutentha kwa HPMC: Chifukwa cha kukhazikitsidwa kwa hydroxypropyl, HPMC imakhala ndi kukhazikika kwamafuta kuposa MC. Kuchita kwa HPMC kumakhala kokhazikika pakatentha kwambiri, kotero kumatha kukhala ndi zotsatira zabwino pakutentha kwakukulu. Kukhazikika kwa kutentha kwake kumapangitsa kuti azigwiritsidwa ntchito kwambiri pazikhalidwe zina zotentha (monga chakudya ndi kukonza mankhwala).
4. Makhalidwe a viscosity
Viscosity ya MC: Methyl cellulose ali ndi kukhuthala kwapamwamba mu njira yamadzimadzi ndipo nthawi zambiri amagwiritsidwa ntchito pazochitika zomwe kukhuthala kwakukulu kumafunika, monga thickeners, emulsifiers, etc. Kuchuluka kwa methylation kumawonjezera kukhuthala kwa yankho.
Viscosity ya HPMC: Kukhuthala kwa HPMC nthawi zambiri kumakhala kotsika pang'ono kuposa kwa MC, koma chifukwa cha kusungunuka kwake kwamadzi komanso kukhazikika kwa kutentha, HPMC ndi yabwino kwambiri kuposa MC nthawi zambiri pomwe kuwongolera kwamakamaka kumafunika. Kukhuthala kwa HPMC kumakhudzidwa ndi kulemera kwa maselo, ndende ya yankho ndi kutentha kwa kutentha.
5. Kusiyana m'magawo ofunsira
Kugwiritsa ntchito MC: Methyl cellulose imagwiritsidwa ntchito kwambiri pomanga, zokutira, kukonza chakudya, mankhwala, zodzoladzola ndi zina. Makamaka m'munda womanga, ndi chowonjezera chomangira chomwe chimagwiritsidwa ntchito kukulitsa, kuwongolera kumamatira ndikuwongolera ntchito yomanga. M'makampani azakudya, MC imatha kugwiritsidwa ntchito ngati thickener, emulsifier ndi stabilizer, ndipo imapezeka muzinthu monga odzola ndi ayisikilimu.
Kugwiritsa HPMC: HPMC chimagwiritsidwa ntchito mankhwala, chakudya, zomangamanga, zodzoladzola ndi mafakitale ena chifukwa solubility ake kwambiri ndi bata matenthedwe. M'makampani opanga mankhwala, HPMC nthawi zambiri imagwiritsidwa ntchito ngati chithandizo cha mankhwala, makamaka pokonzekera pakamwa, monga filimu yakale, thickener, kumasulidwa kosalekeza, ndi zina zotero.
6. Kuyerekeza kwa katundu wina
Transparency: Mayankho a HPMC nthawi zambiri amakhala owonekera kwambiri, motero amakhala oyenera kugwiritsa ntchito zomwe zimafuna mawonekedwe owonekera kapena owoneka bwino. Mayankho a MC nthawi zambiri amakhala opanda pake.
Biodegradability ndi chitetezo: Onse ali ndi biodegradability wabwino, akhoza kuonongeka mwachibadwa ndi chilengedwe pansi pa zinthu zina, ndipo amaonedwa otetezeka ntchito zambiri.
Mtengo wa HPMCndiMCZonsezi ndi zinthu zomwe zimapezedwa ndi kusinthidwa kwa cellulose ndipo zimakhala ndi mapangidwe ofanana, koma zimakhala ndi kusiyana kwakukulu pakusungunuka, kukhazikika kwa kutentha, kukhuthala, kuwonekera, ndi malo ogwiritsira ntchito. HPMC ili ndi kusungunuka kwamadzi kwabwinoko, kukhazikika kwamafuta, komanso kuwonekera, kotero ndiyoyeneranso nthawi zomwe zimafunikira kusungunuka mwachangu, kukhazikika kwamafuta, komanso mawonekedwe. MC imagwiritsidwa ntchito kwambiri pazochitika zomwe zimafuna kukhuthala kwakukulu komanso kukhazikika kwakukulu chifukwa cha kukhuthala kwake komanso kukhuthala kwake.
Nthawi yotumiza: Apr-06-2025