HPMC inosimudzira kunamatira mukuputira maapplication

1. Basic chimiro uye zvimiro zveHPMC

HPMC is a cellulose etherified derivative, iyo inoumbwa ne etherification reaction yeboka rehydroxyl re cellulose molecule ine methyl uye hydroxypropyl makomisheni. Iyo molecular chimiro cheHPMC ine cellulose skeleton uye zvinotsiva, uye zvimiro zvayo zvinogona kugadziriswa nekuunzwa kwezvakasiyana zvinotsiva. Iyi molecular chimiro inopa HPMC yakanakisa kunyungudika kwemvura, kukora, kunamatira uye firimu-kuumba zvivakwa.

Iyo yekunamatira zvimiro zveHPMC zvine hukama zvakanyanya nekugona kwayo hydration. Kana HPMC yanyungudutswa mumvura, mamorekuru anotora mvura uye anozvimba kuti aite yakakwirira-viscosity gel chimiro. Iyi gel ine yakasimba adsorption uye adhesion, inogona kuzadza pores pamusoro peiyo substrate, kuwedzera kutsetseka kwepamusoro uye kufanana kweiyo substrate, uye nekudaro inovandudza iyo yakazara adhesion kuita kwejasi.

2. Mechanism yekuita kweHPMC mumajasi

Mukugadzirwa kwekuputira, basa guru reHPMC rakaita seyakakora, inomisa mumiriri uye stabilizer, uye mabasa aya anokanganisa zvakananga kunamatira kwejasi.

2.1 Kukora mhedzisiro

HPMC isimba rinoita gobvu iro rinogona kuwedzera zvakanyanya viscosity yeiyo coating system uye kupa iyo coating yakanaka yekuvaka kuita. Iyo viscosity yekupfekedza chinhu chakakosha chinokanganisa fluidity yayo, kupararira uye kuvhara simba pane substrate. Nekugadzirisa huwandu hweHPMC hwakawedzerwa, machira eakasiyana maviscosities anogona kuwanikwa kuti asangane nezvinodiwa zvekuvaka zvakasiyana. Yakakodzera coating viscosity inobatsira kupfekedza kuti kugovane zvakaenzana pamusoro peiyo substrate uye kuumba yakapfava yekuputira firimu, nekudaro ichivandudza kusungirirwa kwejasi.

2.2 Kumiswa uye kudzikamisa mhedzisiro

Mumvura-yakavakirwa machira, zvimedu zvakasimba senge pigment uye mafirita anofanirwa kuparadzirwa zvakaenzana muhuputi system kudzivirira sedimentation uye stratification. HPMC mhinduro ine yakanakisa kumiswa uye kugadzikana, uye inogona kuumba network chimiro mune coating system, inonyatso kuputira uye kutsigira yakasimba zvimedu kuti zvigovane zvakaenzana. Kumiswa kwakanaka uye kugadzikana kunogona kuve nechokwadi chekuti iyo coating inochengetedza kufanana panguva yekuchengetedza uye kuvaka, kuderedza kuiswa kwepigment kana mafirita, uye kunatsiridza kutaridzika kwemhando uye kunamatira kwejasi.

2.3 Mafirimu-kugadzira maitiro

HPMC ine simba rakasimba rekugadzira firimu uye rinogona kuumba firimu rinoshanduka panguva yekuomeswa kwekuputira. Iyi firimu haigone kungowedzera simba remagetsi rejasi pachayo, asiwo kutamba bhiriji basa pakati pe substrate uye kupfeka. Mushure mekugadzirwa kwefirimu reHPMC, inogona kuzadza madiki akatsemuka uye nzvimbo dzisina kuenzana pamusoro peiyo substrate, nekudaro ichiwedzera nzvimbo yekubatana pakati pekuputira uye substrate uye nekuvandudza kunamatira kwemuviri kwejasi. Uye zvakare, iyo firimu-inogadzira mashandiro eHPMC inogona kunyatso kudzikisa kuputika uye kupepeta pamusoro peiyo coating, zvichiwedzera kuvandudza kusimba kwejasi.

3. Kushandiswa kweHPMC mumarudzi akasiyana-siyana ekuputira

Zvichienderana nemhando dzakasiyana dzemachira, iyo adhesion yekusimudzira mhedzisiro yeHPMC ichave yakasiyana. Iyi inotevera mienzaniso yeHPMC yekushandisa mune akati wandei akajairwa marudzi ekupfeka:

3.1 Mvura-based coatings

Mumvura-based coatings, HPMC inogona kuvandudza zvakanyanya kunamatira uye kuita kwekuvaka kwejasi kuburikidza neakawanda maitiro akadai sekukora, kumiswa uye kuumbwa kwemafirimu. Sezvo HPMC ine mvura yakanaka solubility, inogona kukurumidza kuparadzirwa mumvura-based coatings kuti iite yakagadzikana mhinduro system. Uye zvakare, HPMC inogona zvakare kuvandudza kuchengetwa kwemvura kwemvura-yakavakirwa machira uye kudzivirira kuputika uye kuderera kunamatira kunokonzerwa nekurasikirwa kwemvura yakawandisa panguva yekuomesa.

3.2 Dhaka rakaoma

HPMC inoshandiswawo zvakanyanya mudhaka rakaoma. Dry mortar chinhu chinowanzoshandiswa mukushongedza kwekuvaka, iyo inosanganiswa nemvura kuti igadzire coating. Mune ino sisitimu, iko kukora uye firimu-kugadzira mhedzisiro yeHPMC inogona kuvandudza kusimba kwechisungo chedhaka, ichiita kuti iwedzere kunamatira kune substrates semadziro kana pasi. Pamusoro pezvo, nzvimbo yekuchengetedza mvura yeHPMC inogona kudzivirira mvura iri mudhaka kuti irege kubuda nekukurumidza, nekudaro kuve nechokwadi chekunamatira kwedhaka panguva yekuvaka nekuomesa.

3.3 Adhesive coatings

Mune anonamira mabhanhire, HPMC inoshandiswa setackifier kunatsiridza zvakanyanya kunamatira kwejasi. Iyo colloidal chimiro chakaumbwa nemhinduro yayo haigone kungovandudza kusungirirwa kwemuviri pakati pekupfeka uye substrate, asi zvakare kuwedzera kusimba kwakabatana kwekunamatira, kuve nechokwadi kuti iyo yekupfeka inochengetedza yakanaka kunamatira pasi pemamiriro akasiyana ezvakatipoteredza.

4. Zvakanakira HPMC mukusimudzira adhesion

Sekuwedzera kunoshanda mumachira, HPMC ine zvinotevera zvakanakira mukusimudzira adhesion:

Yakanakisa solubility yemvura uye kuenderana: HPMC inogona kunyungudutswa mumhando dzakasiyana dzesolvent uye inonyatso kuenderana nezvimwe zvinowedzera kana zvimisikidzo pasina kukanganisa kwakashata, kuve nechokwadi kugadzikana kwekuita kwekuvhara.

Kuita kwakanakisa kwekuvaka: HPMC inogona kuvandudza kuyerera uye kupararira kwejasi, kuve nechokwadi chekuti iyo yekupfeka yakafukidzwa zvakaenzana pamusoro peiyo substrate, uye inosimudzira kunamatira kwayo.

Kuvandudza kuchinjika uye kusimba kwejasi: Iyo firimu-inogadzira mhedzisiro yeHPMC inogona kuvandudza kuchinjika kwejasi, zvichiita kuti isanyanya kutsemuka kana kupepeta kana ichiiswa pasi pekumanikidza kana shanduko yezvakatipoteredza, uye kuwedzera hupenyu hwebasa rejasi.

Kudzivirirwa kwezvakatipoteredza: HPMC isiri-chepfu uye isingakuvadzi yepolymer zvinhu zvinosangana nezvinodiwa zvemazuva ano ekupfeka indasitiri yekuchengetedzwa kwezvakatipoteredza uye hutano.

Sekuwedzera kunoshanda, HPMC inoshandiswa mumachira, kunyanya mukunamira. Kuburikidza nekukora kwayo, kumiswa, kuumba firimu uye mamwe mabasa, HPMC inogona kunyatso kuvandudza kunamatira kwemajasi uye kuwedzera kunaka kwese uye kusimba kwejasi. Nekuenderera mberi nekuenderera mberi kwehunyanzvi hwekupfeka, tarisiro yekushandiswa kweHPMC ichave yakakura uye icharamba ichiita basa rakakosha mumasisitimu ekupfeka akasiyana.