1. Pfupiso yeHPMC
Hydroxypropyl methylcellulose (HPMC kwenguva pfupi) chinhu chinowanzo shandiswa chepolymer zvinhu, chinoshandiswa zvakanyanya mukuvaka, machira, mushonga, chikafu nemimwe minda. HPMC inowanikwa nekugadziriswa kwekemikari yemasikirwo cellulose, ine kunyungudika kwemvura uye biocompatibility, uye isinganyungudika muorganic solvents. Nekuda kwekunakisa kunyungudika kwemvura, kunamatira, kukora, kumiswa uye zvimwe zvivakwa, HPMC yakashandiswa zvakanyanya muindasitiri yekuvaka, kunyanya mukushandiswa kweputty poda.
2. Basa reHPMC mu putty powder
Putty poda chivakwa chekuvaka chinoshandiswa kugadzirisa madziro, uye zvikamu zvaro zvikuru mafirita nemabhainda. HPMC, seyakajairwa thickener uye mvura-yekuchengetedza mumiriri, inogona kunyatso kuvandudza mashandiro eputty powder, kunyanya kusanganisira zvinotevera zvinhu:
Kukora mhedzisiro: HPMC inoumba colloidal mhinduro mushure mekunyungudika mumvura, iyo ine yakasimba thickening mhedzisiro, inogona kuvandudza rheological ehupfumi hweputty poda, iite kuti ive yakakodzera viscosity, kudzivirira kutetepa zvakanyanya paunenge uchinyorera, uye kuvandudza kunyaradza kwekushanda.
Kuvandudza mashandiro ekuvaka: HPMC's thickening effect haingoite kuti putty powder isanyanya kudonha kana kudonha panguva yekushandisa, asi zvakare inosimudzira kunamatira kweputty poda, zvichiita kuti zvive nyore kuisa kumadziro, nekudaro zvichivandudza kushanda kwekuvaka.
Kuvandudza kuchengetwa kwemvura: HPMC inogona kuchengetedza mvura muputty poda uye inonoke kuyerera kwemvura. Izvi zvinogona kudzivirira pamusoro peputty poda kubva pakuoma nekukurumidza, kuve nechokwadi chekushanda kwayo panguva yekuvaka, uye kudzivirira kutsemuka nekudurura.
Kuvandudza kubata uye kutsvedzerera kwepasi: HPMC haingogone chete kukwidziridza ductility yeputty poda, asi zvakare kuvandudza kwayo kupfava kwepamusoro, ichiita kuti putty layer ipfavise, iyo inobatsira kune anotevera pendi mashandiro. Munguva yekuvaka, HPMC inogona kupa zvirinani kutsvedzerera uye kuderedza chizvarwa chekuremara uye mabhuru.
Kuvandudza kugadzikana kwekuvaka: Kuwedzerwa kweHPMC kunogona kuvandudza anti-precipitation ye putty powder, kudzivirira kuiswa kwezvikamu zvakanaka mukati mayo, uye kuvimbisa kuti hutano nekushanda kweputty powder hazvizoshanduki zvakanyanya panguva yekuchengetedza kwenguva refu.
Kuvandudza kuputika kwekudzivirira: Kuburikidza nekuchengetedza kwemvura uye kuwedzera kwemaitiro eHPMC, kuputika kweputty powder kunogona kuvandudzwa, kuputika pamadziro kunogona kudzivirirwa, uye hupenyu hwebasa hunogona kuwedzerwa.
3. Yakakodzera viscosity yeHPMC
Mhedzisiro yeHPMC mune putty poda yakabatana zvakanyanya neiyo viscosity. Sarudzo ye viscosity inofanirwa kutariswa zvinoenderana nezvinodiwa chaizvo zveputty poda uye nharaunda yekuvaka. Kazhinji kutaura, viscosity yeHPMC inotangira kubva kumazana kusvika kumakumi ezviuru zvemillipoise (mPa · s), pakati payo maviscosity akasiyana akakodzera mhando dzakasiyana dzeputty poda uye zvinodiwa zvekuvaka.
Low viscosity HPMC (inenge 1000-3000 mPa · s): inokodzera lightweight putty powder kana base putty, inonyanya kushandiswa mumamiriro ezvinhu apo mvura yakakwirira inodiwa. Low viscosity HPMC inogona kupa zvirinani kukoira kuita, ichiita kuti putty hupfu ive nyore kushanda, asi kuchengetedza mvura uye kutsemuka kuramba hakuna kusimba.
Medium viscosity HPMC (inenge 3000-8000 mPa · s): yakakodzera kune akawanda akajairika putty poda mafomula, ayo anogona kupa kuchengetwa kwemvura kwakanaka uye anti-precipitation uchichengetedza fluidity yakanaka. HPMC yeviscosity iyi haigone kungosangana nezvinodiwa zvekupfeka panguva yekuvaka, asiwo zvinobudirira kudzivirira matambudziko akadai sekutsemuka uye kudonha.
High viscosity HPMC (inenge 8000-20000 mPa · s): yakakodzera kune akakora akaturikidzana eputty poda kana zviitiko zvinoda kusimba kwakasimba. High viscosity HPMC inogona kupa zvirinani gobvu coating kuita uye kugadzikana, uye inokodzera kupfekedza maapplication anoda kubata kwakasimba uye kutsvedzerera, asi zvinofanirwa kucherechedzwa kuti yakawandisa viscosity inogona kuita kuti putty hupfu ive yakanyanyisa uye inokanganisa kushanda kwekuvaka.
Mumashandisirwo anoshanda, iyo yakakodzera HPMC viscosity inofanirwa kusarudzwa zvinoenderana nemamiriro ekushandisa uye nzira yekuvaka yeputty poda. Semuenzaniso, kana madziro emadziro aine hutsinye kana akawanda ekuvaka anodiwa, yakakwira viscosity HPMC inogona kusarudzwa kuti iwedzere kunamatira uye kutsemuka kuramba kwejasi; nepo mune dzimwe nguva zvinoda yakakwira fluidity uye nekukurumidza kuvaka, yakaderera kusvika yepakati viscosity HPMC inogona kusarudzwa.
Hydroxypropyl methylcellulosechinhu chakakosha chivakwa chekuwedzera chinogona kuvandudza zvakanyanya mashandiro ekuvaka, kuchengetedza mvura, kunamatira uye kutsemuka kuramba kweputty poda. Kusarudza iyo chaiyo HPMC viscosity yakakosha pakushandiswa kweputty poda. Yakasiyana viscosities inogona kugadziriswa zvichienderana nerudzi rwe putty poda, nharaunda yekuvaka, uye kuita zvinodiwa. Mukugadzira uye kuvaka, kudzora viscosity yeHPMC inogona kuwana yakanakira kuvaka mhedzisiro uye kushanda kwenguva refu. Nokudaro, maererano nezvinodiwa zvakasiyana-siyana zvekuvaka, kusarudza zvine musoro nekugadzirisa viscosity yeHPMC inhanho inokosha yekuvimbisa kushanda uye kunaka kweputty powder.
Nguva yekutumira: Mar-25-2025