Kuyerekeza kwa HEC ndi HPMC mu ntchito zophimba

Mu makampani amakono opaka utoto, kuti akonze mawonekedwe a rheological, kukhazikika kwa malo osungiramo zinthu komanso magwiridwe antchito a utotowo, nthawi zambiri pamafunika kuwonjezera zowonjezera zina za polima. Pakati pa izi,hydroxyethyl cellulose (HEC)ndihydroxypropyl methylcellulose (HPMC)ndi zinthu ziwiri zothina ndi zokhazikika za cellulose ether zomwe zimagwiritsidwa ntchito kwambiri. Ngakhale kuti zonsezi ndi ma ether a cellulose omwe si a ionic, pali kusiyana koonekeratu pa kapangidwe ka mankhwala, makhalidwe a ntchito, ndi zotsatira za kugwiritsidwa ntchito mu zokutira.

1. Kapangidwe ka mankhwala ndi kusungunuka

HEC ndi polima yosasungunuka m'madzi yopangidwa kuchokera ku cellulose yachilengedwe poyambitsa magulu a hydroxyethyl kudzera mu etherification reaction. Kapangidwe kake ka molekyulu kali ndi magulu ambiri a hydrophilic hydroxyl ndi hydroxyethyl, zomwe zimapangitsa kuti ikhale ndi madzi abwino osungunuka. HEC imatha kusungunuka mwachangu m'madzi ozizira kuti ipange yankho lowonekera bwino lokhuthala.

HPMC ndi polima wopangidwa poyambitsa hydroxypropyl ndi methyl substituents pa mamolekyulu a cellulose. Chifukwa cha kukhalapo kwa gulu lake la hydrophobic methyl, lili ndi ntchito yabwino pamwamba komanso mawonekedwe opanga filimu kuposa HEC. HPMC imatupa pang'onopang'ono m'madzi ozizira, imatenga nthawi yayitali kuti isungunuke kwathunthu, ndipo imakhudzidwa kwambiri ndi kutentha.

2. Kuyerekeza kwa makhalidwe a rheological

HEC ili ndi khalidwe lofanana ndi la rheological, lomwe limasonyeza kuti silili lolimba, kutanthauza kuti silili lolimba, ndipo ndi loyenera makina ophimba omwe amafunikira kulinganiza bwino. Kukhuthala kwa yankho la HEC kumachepa pamene likudulidwa kwambiri, zomwe zimathandiza pakutsuka, kupukuta ndi kulinganiza panthawi yomanga.

Yankho la HPMC limasonyeza khalidwe lamphamvu la pseudoplastic, ndi kukhuthala kwakukulu pansi pa kudulidwa kochepa, zomwe zimathandiza kupewa kutsetsereka ndi kutsetsereka; kukhuthala kumachepa kwambiri pansi pa kudulidwa kwakukulu, zomwe zimathandiza kukonza kapangidwe kake. Chifukwa chake, HPMC imagwira ntchito bwino kwambiri popaka utoto wa facade womwe umafunikira mphamvu zolimba zoletsa kutsetsereka.

3. Kusunga madzi ndi momwe ntchito yomanga imagwirira ntchito

HPMC imasunga madzi bwino kuposa HEC, makamaka m'malo ouma kapena kutentha kwambiri, HPMC imatha kuchedwetsa kusungunuka kwa madzi ndikuletsa kusweka kapena kuchepa kwa filimu yophimba. Izi zimapangitsa HPMC kugwiritsidwanso ntchito kwambiri mu zophimba zopangidwa ndi putty, gypsum ndi simenti, makamaka zoyenera kupaka utoto nthawi yachilimwe kapena nyengo youma.

Ngakhale kuti HEC ilinso ndi ntchito inayake yosunga madzi, zotsatira zake zimakhala zochepa pang'ono poyerekeza ndi HPMC, makamaka m'malo otentha kwambiri komanso othamanga kwambiri ndi mphepo. Kusasunga madzi okwanira kungayambitse kuuma mwachangu kwambiri pambuyo pomanga, zomwe zimakhudza kuchulukana ndi kusalala kwa chophimbacho.

4. Kukana kwa ma enzyme ndi kuwonongeka kwa zinthu

HEC ili ndi magulu ambiri a hydroxyethyl m'mapangidwe ake ndipo ndi yosavuta kuwonongeka ndi tizilombo toyambitsa matenda. Chifukwa chake, kukana kwake ma enzyme ndi kochepa, makamaka ikasungidwa kwa nthawi yayitali, ingayambitse kuwonongeka, ndipo zosungira ziyenera kuwonjezeredwa kuti nthawi yosungira ikule.

HPMC ili ndi kukana kwa ma enzyme bwino kuposa HEC ndipo ndi yokhazikika kwambiri. Ndi yoyenera kwambiri pa zokutira zamafakitale zomwe zimafunikira kukhazikika kwambiri pakusunga.

5. Mtengo ndi momwe msika umagwiritsidwira ntchito

Poganizira mtengo, HEC ndi yotsika mtengo ndipo ndi yoyenera zinthu zazikulu komanso zotsika mtengo zopangira utoto. Mphamvu yake yabwino yokhuthala komanso kusinthasintha kwake zimapangitsa kuti ikhale ndi gawo lalikulu pamsika monga zophimba mkati mwa khoma ndi utoto wotsika wa latex.

Ngakhale kuti HPMC ndi yokwera mtengo pang'ono, magwiridwe ake abwino kwambiri amawapangitsa kuti agwiritsidwe ntchito kwambiri m'makina opaka utoto apakatikati mpaka apamwamba, makamaka nthawi zomwe zimakhala ndi zofunikira kwambiri pakugwira ntchito yomanga, kuteteza kutsika kwa madzi komanso kusunga madzi, monga zopaka utoto zakunja kwa khoma, zopaka utoto zotanuka, ndi zopaka utoto zoteteza nyengo.

6. Chilengedwe ndi chitetezo

Zonsezi ndi ma ether a cellulose omwe si a ionic, ali ndi mgwirizano wabwino ndi chilengedwe komanso amatha kuwonongeka, alibe ma volatile organic compounds (VOCs), ndipo akugwirizana ndi chitukuko cha zophimba zobiriwira komanso zachilengedwe. Komabe, panthawi yogwiritsa ntchito, chisamaliro chiyenera kuperekedwabe ku fumbi ndi hygroscopicity yake, ndipo chitetezo chofunikira pakugwira ntchito chiyenera kutengedwa.

HECndiHPMCChilichonse chili ndi ubwino wake pakugwiritsa ntchito kupaka utoto. HEC ndi yoyenera kwambiri pazinthu zopaka utoto zomwe zimayang'ana kwambiri pakuwongolera mtengo ndipo zimakhala ndi zofunikira zambiri kuti zomangamanga zizitha kuyenda bwino; pomwe HPMC imagwiritsidwa ntchito kwambiri mu kupaka utoto wapakati mpaka wapamwamba kwambiri wokhala ndi zofunikira pakugwira ntchito bwino chifukwa cha kusunga bwino madzi, kuletsa kugwa komanso magwiridwe antchito omanga. Mu ntchito zenizeni, HEC kapena HPMC ziyenera kusankhidwa moyenera kutengera zinthu monga zofunikira pakugwira ntchito kwa fomula yopaka utoto, njira zomangira ndi nyengo, ndipo zitha kugwiritsidwa ntchito pamodzi ngati pakufunika kuti pakhale magwiridwe antchito abwino.