Hydroxypropyl methylcellulose (HPMC) chinhu chakakosha chepolymer, chinowanzo shandiswa mumaputuru mundima yekuvaka. Inogona kuvandudza zvakanyanya kuita kwekuvaka uye kunaka kwe putty. Iyo haigone kungovandudza mashandiro ekuvaka kweputty, asi zvakare inosimudzira kunamatira kwayo, kuchengetedza mvura uye kuramba kwekuputika, saka inoremekedzwa zvakanyanya mukuvaka.
1. Basic maitiro eHPMC
HPMC is a non-ionic cellulose ether, iyo inogadziriswa kemikari kubva kune yakasikwa cellulose. Mushonga waro wemvura une kuchengetwa kwemvura kwakanaka, kukora uye kunamatira, uye inogona kuchinjika kune zvakasiyana-siyana zvekushandisa munzvimbo yekuvaka. Mushure mokunge HPMC yanyungudutswa mumvura, inogona kuumba yakajeka uye yakagadzikana colloidal solution, iyo isingatani kukanganiswa nepH kukosha. Pamusoro pezvo, inewo kupikisa kwakasimba kune enzymatic hydrolysis, oxidation resistance, light resistance, acid resistance, alkali resistance uye mamwe maitiro, ayo anogonesa HPMC kuchengetedza kuita kwakanaka munzvimbo dzakasiyana dzekuvaka.
2. Nheyo yekushanda yeHPMC mune putty layer
Mune putty layer, HPMC inonyanya kutamba mabasa anotevera:
Wedzera kuchengetwa kwemvura: HPMC ine simba rekuchengetedza mvura, iyo inogona kudzivirira zvinobudirira mvura iri muputty layer kubva pakubuda nekukurumidza. Munguva yekugadzira putty, iyo nzvimbo inomhanyisa kuoma nekuda kwekubuda kwemvura, asi kuvepo kweHPMC kunogona kuchengetedza iyo putty layer pane yakakwira hunyoro, nekudaro ichiwedzera nguva yakavhurika yeputty, iyo inobatsira vashandi vekuvaka kuti vagadzirise. uye gadzirisa, uye zvakare inobatsira iyo putty kusimba zvizere uye kudzivirira kutsemuka kunokonzerwa nekunyanya kuomesa.
Kuvandudza kukora: HPMC ine kukora mhedzisiro, iyo inogona kupa iyo putty slurry zviri nani viscosity, nekudaro ichivandudza kushanda kwayo kwekushandisa. Iyo putty layer inoda imwe viscosity kuti ifambise kuvaka, nepo ichiva nechokwadi chekuti putty inogona kugovaniswa zvakaenzana uye yakanamatira zvakasimba kumadziro. Iko kukora mhedzisiro yeHPMC inogona kubatsira iyo putty layer kuchengetedza yakagadzikana, ichiita kuti oparesheni iite mushe uye kuderedza chiitiko chekudonha uye kutsvedza panguva yekuvaka.
Kuvandudza crack resistance: Dambudziko rinowanzoitika mukuomesa kweputty layer ndeye chizvarwa chezvimedu zvidiki, izvo zvinokanganisa kunaka kwechigadzirwa chakapedzwa. HPMC inogona kudzivirira kutsemuka mune putty layer nekuti inogona kugadzira yakagadzikana fiber network chimiro mushure mekunge putty yaporeswa, nekudaro ichiwedzera kuoma kweiyo putty uye kuderedza kuputika kunokonzerwa nekuomesa shrinkage uye tembiricha kusagadzikana.
Kuvandudza mashandiro ekuvaka: HPMC inogona kuvandudza kutsetseka kwekuvaka kwekuisa, zvichiita kuti isanyanya kuve nezvinetso zvakaita sekukwevera uye mamaki ebanga panguva yekuvaka. Iyo colloidal mhinduro yakaumbwa neHPMC mumvura ine yakanaka lubricating mhedzisiro, iyo inogona kuita kuti putty ipfave kana ichitsvedzerera uye kupukuta, nekudaro kuderedza kuoma kwekuvaka.
Enhad adhesion: HPMC inogona kuvandudza zvakanyanya kunamatira pakati pe putty layer uye base wall, kudzivirira iyo putty layer kubva pakudonha kana kuputika. Iyo colloidal mhinduro yakaumbwa neHPMC mune putty inogona kunyatsobatanidzwa neiyo base yepasi kuti iwedzere kusimba kwekunamatira kweiyo putty. Uku kunamatira kwakanaka kunogona kuve nechokwadi kuti iyo putty layer inoramba yakagadzikana kwenguva yakareba mushure mekuvaka, ichivandudza kusimba kweiyo yakazara yekushongedza maitiro.
3. Zvakanakira uye chiyero chekushandiswa kweHPMC
Zvakanakira zveHPMC mukushandiswa kwema putty layers zvinonyanya kuratidzwa mune zvinotevera zvinhu:
Kuvandudza kugona kwekuvaka kweputty: Sezvo HPMC ichigona kuwedzera nguva yakavhurika yeputty, vashandi vekuvaka vanogona kupedzisa basa rekuisa mune imwe nguva yakawandisa, kuderedza nguva inodiwa yekudzokororwa kunyorera, uye zvakare kuderedza kuoma kwekuvaka.
Sevha zvinhu zveputty: Iko kukora mhedzisiro yeHPMC inogona kuderedza kuvhuvhuta kwemvura, nekudaro ichiwedzera kuwirirana kweputty, ichiita kuti putty iwedzere hupfumi, kuderedza huwandu hwezvinhu zveputty, uye kuderedza mitengo yekuvaka.
Inoshanda kune akasiyana emadziro substrates: HPMC inogona kuchinjika zvakanaka kune akasiyana ma substrates senge kongiri madziro uye zvigadziko zvedhaka, uye inogona kunyatso kusimudzira adhesion uye kuvaka zvivakwa zvemhando dzakasiyana dze substrate.
Yakasimba kuchinjika kumamiriro ekunze: Sezvo HPMC iine simba rekuchengetedza mvura uye kugadzikana, kunyangwe ichivakwa munzvimbo inopisa kana yakaderera-yakanyorova, inogona kuvharisa nekukurumidza kurasikirwa kwemvura muputty layer uye kuve nechokwadi chekuita kwakanaka kweputty.
IV. Chengetedzo yekushandiswa kweHPMC
Mumashandisirwo chaiwo, huwandu uye nzira yekuwedzera HPMC inokanganisa kuita kwekupedzisira kweiyo putty. Mumamiriro ezvinhu akajairwa, huwandu hweHPMC hwakawedzerwa hunofanirwa kuve pakati nepakati. Kana yakawandisa yakawedzerwa, nguva yekuomesa yeputty layer inogona kurebeswa, inokanganisa kufambira mberi kwekuvaka. Naizvozvo, kana uchiishandisa, huwandu hunofanirwa kudzorwa zvine musoro zvichienderana nehunhu hwechigadzirwa cheputty uye nharaunda yekuvaka. Uye zvakare, HPMC inofanirwa kuchengetwa munzvimbo ine hunyoro kudzivirira kuti isatore unyoro uye agglomerating, izvo zvinokanganisa mashandisiro ekushandisa.
Iko kushandiswa kweHPMC mune putty layer inovandudza kushanda, kuchengetedza mvura uye kutsemuka kuramba kweputty, zvichiita kuti ichengetedze mhedzisiro yakanaka pasi pemamiriro akasiyana ekuvaka. Nekuwedzera huwandu hwakakodzera hweHPMC, muvaki anogona kudzora zviri nyore maitiro ekuvaka kweiyo putty, kuvandudza kupfava kwepasi kweputty layer uye kunaka kwechigadzirwa chakapedzwa. Nokudaro, kushandiswa kweHPMC mune putty layer hakungogone kuvandudza zvakanyanya maitiro ekuvaka, asiwo kuwedzera hupenyu hwebasa rekushongedza, kupa chivimbiso chakasimba chekuonekwa uye mukati memigumisiro yechivako.
Nguva yekutumira: Nov-02-2024