HPMC (Hydroxypropyl Methylcellulose) isanganiswa yepolymer inonyungudika nemvura inowanikwa nekugadziriswa kwekemikari yemasikirwo cellulose. Inoshandiswa zvakanyanya mumunda wependi uye machira nekuda kwekukora kwayo kwakanaka, kugadzikana, uye kuchengetedza mvura. HPMC inogona kuvandudza zvakanyanya rheology, kugadzikana, uye kuita kwekuvaka kweiyo coating, kuve nechokwadi chekuti iyo coating ine yakagadzikana kuita panguva yekuchengetedza, yekufambisa, uye kuvaka, uye kuwana yunifomu yekuputira firimu.
(1) Basic zvimiro zveHPMC
HPMC isiri-ionic cellulose ether ine zvinotevera maitiro:
Kukora mhedzisiro: HPMC inogona kugadzira viscous mhinduro mumvura uye organic zvinonyungudutsa, izvo zvinogona kunyatso kuwedzera viscosity yejasi, nekudaro ichiwedzera kuita kwekuvhara kwekuvhara uye ukobvu hwekuputira.
Kuchengetedza mvura mhedzisiro: HPMC ine yakanakisa kuchengetedza mvura uye inogona kudzivirira kukurumidza kubuda kwemvura mukuputira. Inonyanya kukodzera kuvharidzirwa kwemvura kunoda kushandiswa munzvimbo yakaoma.
Firimu-yekugadzira pfuma: HPMC, seyamuro yekugadzira firimu, inogona kubatsira iyo yekuputira kuumba yakatsetseka uye yunifomu yekuputira firimu panguva yekuomeswa, kuvandudza kutaridzika uye kupfava kweiyo firimu rekuvhara.
Kugarisana: HPMC ine kugadzikana kwakanaka kwemakemikari uye kuenderana neyakasiyana-siyana yekugadzira zvinongedzo, uye yakakodzera kune akasiyana marudzi ekuputira maumbirwo.
(2) Iwo makuru mabasa eHPMC mumapende uye machira
1. Mukobvu
Mukugadzira pendi nekuputira, HPMC, seimwe yeakanyanya thickeners, inobatsira kugadzirisa rheology (kureva, fluidity uye deformability) yejasi nekushandura viscosity yayo. Yakanaka rheological zvivakwa zvinogona kudzivirira iyo yekubikira kubva pakugadzirisa panguva yekuchengetera uye kuchengetedza yakakodzera fluidity uye coating kuita panguva yekuvaka.
Iyo thickening mhedzisiro ine mhedzisiro dzakasiyana pamhando dzakasiyana dzekupfeka. Mumvura-based coatings, HPMC inowedzera viscosity yejasi, zvichiita kuti zvive nyore kuisa uye kugovera zvakaenzana pamusoro pepamusoro, kudzivirira kudonha. Mune zvinonyungudutsa-based coatings, HPMC inobatsirawo kugadzirisa viscosity uye kupa yakakodzera thixotropy (iyo yekupfeka inokora kana yasiiwa yakamira uye yakatetepa kana yamutswa kana kuiswa).
2. Mushandi wekuchengetedza mvura
Mhedzisiro yekuchengetedza mvura yeHPMC inonyanya kukosha, kunyanya mumapendi ane mvura. Inogona kudzivirira zvinobudirira mvura iri mupende kuti irege kukurumidza kubuda panguva yekuvaka, nekudaro ichiva nechokwadi chekuti kupfekedza kune nguva yakakwana yekuyera uye kugadzira firimu rakapfava uye rakafanana. Pasi pakaoma kana tembiricha yepamusoro, kubuda kwemvura mupende nekukurumidza kunogona kukonzera kutsemuka kwefirimu rekuputira kana nzvimbo isina kuenzana. HPMC inogona kuderedza zvakanyanya kuita uku.
HPMC inogona zvakare kubatsira ma pigment uye mafirita mupende kuti arambe akapararira panguva yekuvaka, kudzivirira kuomeswa kwenzvimbo kana particle agglomeration, nekudaro kuve nechokwadi chekunaka uye kufanana kwefirimu rekuputira.
3. Leveling agent uye anti-sagging effect
Semumiriri wekuyera, HPMC inogona kudzivirira pendi kubva pakudonha kana kudonha panguva yekuomesa kwepende. Nekuda kweiyo yakakosha rheological zvimiro, HPMC inogona kupa mvura yakanaka panguva yekuvaka yekuputira, ichibvumira pendi kuti iparadzirwe zvakaenzana pamusoro peiyo substrate. Mushure mekumisa kuvhiyiwa, viscosity yepende inopora zvishoma nezvishoma kudzivirira kuyerera kwakanyanya uye kuumbwa kwemavara ekuderera.
Iyi ficha inonyanya kukosha mukupenda kwefacade kana dzimwe nguva panodiwa vertical application. Kuwedzerwa kweHPMC kunovimbisa kuti pende inokurumidza kuwana kuwirirana kwakakodzera mushure mekushandiswa, kuitira kuti igare pamusoro pepamusoro iyo inoshandiswa, uye haireruki ichidzika nekuda kwesimba rinokwevera zvinhu pasi.
4. Dissperant effect
HPMC, se dispersant, inogona kuvandudza dispersibility ye pigment uye fillers mupende. Nekuvandudza dispersibility ye pigment uye mafirita, HPMC inogona kuve nechokwadi chekuti zvimedu zvakasimba mupende zvinoramba zvakaparadzirwa zvakanaka, kudzivirira agglomeration uye sedimentation, uye nekudaro inovandudza kufanana uye kugadzikana kwejasi. Izvi zvakakosha pakuenderana kwemavara uye ma mechanical properties yejasi.
5. Rubatsiro rwekugadzira firimu
Munguva yekugadzira firimu repende, HPMC inogona zvakare kushandiswa seyamuro yekugadzira firimu kubatsira kuumba yunifomu yekuputira. Ichi chimiro chakakosha pakuvandudza kunaka kweiyo coating. Munguva yekuomesa, HPMC inova nechokwadi chekuti pendi inogona kuoma zvakaenzana pamusoro uye mukati nekugadzirisa chiyero chekubuda kwemvura, ichigadzira jira rakatsetseka uye rakatsetseka. Kunyanya mu-high-gloss peints uye pendi yekushongedza, basa reHPMC rinoita kuti kuvhara kuve nechitarisiko chakanaka.
(3) Zvakanakira kushandisa HPMC
1. Kuvandudza kushanda kwekuvaka kwekuputira
Iyo rheological regulation mhedzisiro yeHPMC inoita kuti iyo coating iite nyore kushanda panguva yekushandisa, uye kuita kwekuvaka kunovandudzwa zvakanyanya. Iyo yekuputira haizoyerere zvakanyanya kana kuburitsa mabrashi mavanga, iyo yekupfekedza yakawedzera yunifomu, uye firimu rekuvhara rakaumbwa mushure mekuvaka rakapfava uye rakapfava.
2. Kuvandudza kugadzikana kwekuchengetedza kwekuputira
HPMC inogona kudzivirira stratification uye sedimentation yejasi panguva yekuchengetedza, uye kuchengetedza kufanana uye kugadzikana kwejasi. Kuwedzera kwayo uye kuparadzira mhedzisiro inogona kunyatso kuchengetedza pigments uye mafiritsi ari mujasi mune yakaenzana yakapararira mamiriro, kuwedzera hupenyu hwekuchengetedza kwejasi.
3. Kuvandudza maitiro e-anti-cracking yefirimu yekuputira
Mhedzisiro yekuchengetedza mvura yeHPMC inovimbisa kuti mvura iri mumucheka inogona kunyungudutswa zvishoma nezvishoma panguva yekuomeswa, uye iyo firimu yekuputira haizotsemuka nekuda kwekukurumidza kuomeswa kana ikaumbwa, nekudaro ichivandudza huwandu hwese uye kusimba kweiyo firimu yekuputira.
4. Kuchinja kune zvakasiyana-siyana zvakatipoteredza
Sezvo HPMC ine yakasimba kuchinjika kuchinja tembiricha uye mwando, zvakakodzera coating kuvaka pasi siyana kwezvakatipoteredza mamiriro, kunyanya tembiricha uye yakaderera mwando nharaunda. HPMC inogona kunyatso kuvandudza kuchengetwa kwemvura kwejasi uye kudzivirira iyo yekupfeka kubva pakuoma nekukurumidza.
(4) Kushandiswa kweHPMC mumhando dzakasiyana dzemachira
Mvura-based coatings: HPMC inonyanya kushandiswa kukora, kuchengetedza mvura uye kugadzirisa nhanho mumvura-based coatings. Inogona kuvandudza kushanda kwekuvaka kwemvura-based coatings, kunyanya kana inoshandiswa munzvimbo inokurumidza kuoma, inogona kuvandudza zvakanyanya simba rekuchengetedza mvura yekuvhara.
Architectural coatings: Mumachira ekuvaka, HPMC inova nechokwadi chekuchengetedzwa kwenguva refu kwemadziro kana zvivakwa zvechivako nekusimudzira kutsemuka kuramba uye kusimba kwejasi. Mavara ekuvaka anowanzoda kuita kwepamusoro kwekuvaka uye kuramba kwemamiriro ekunze, uye HPMC inogona kubatsira kuvandudza zvivakwa izvi.
High-gloss coatings: High-gloss coatings ine zvinodiwa zvakakwirira zvekupfava kwepamusoro uye kutsetseka. Iyo yekuyera mhedzisiro uye firimu-yekugadzira pfuma yeHPMC inogona kuvandudza zvakanyanya kutaridzika kwemhando yejasi, ichiita kupenya uye kupfava.
HPMC inobata mabasa mazhinji mupendi uye machira, kusanganisira kukora, kuchengetedza mvura, kuyera, kupararira uye kugadzira firimu. Haikwanise kungovandudza kushanda kwekuvaka kwekuputira, asiwo kuvandudza hutano uye kusimba kwefirimu yekuputira. Naizvozvo, HPMC inoshandiswa zvakanyanya mukugadzirwa kwemazuva ano ekupfekedza uye chinhu chakakosha chekuwedzera kuti ive nechokwadi chekuita uye kunaka kwejasi.
Nguva yekutumira: Oct-11-2024