Hydroxypropylmethylcellulose (HPMC) chinhu chakakosha chinowedzera mudura, chinoita basa guru mukuvandudza mashandiro edura. Sechinhu chisina chepfu, chisingasvibisi uye chisina njodzi kunharaunda, HPMC yakatsiva zvishoma nezvishoma zvimwe zvinhu zvechinyakare zvakaita se starch ether uye lignin ether muindasitiri yekuvaka. Chinyorwa chino chichakurukura basa rakakosha reHPMC mudura kubva pazvinhu zvitatu zvekuchengetedza mvura, kushanda zvakanaka uye kubatana.
HPMC inogona kuvandudza kuchengetwa kwemvura kwedhaka. Kuchengetwa kwemvura kwedhaka kunoreva kugona kwedhaka kuchengetedza huwandu hwemvura panguva yekuvaka. Kuchengetwa kwemvura kwedhaka kunoenderana nekushanda kwesimende nezvimwe zvinoshandiswa mudhaka. Kana dhaka rikarasikirwa nemvura yakawandisa, zvichaita kuti dhaka riome, izvo zvinoderedza kushanda kwaro nekunamatira kwaro zvakanyanya, uye zvinotokonzera matambudziko akadai sekutsemuka kwechigadzirwa chapera.
HPMC ine hydroxypropyl ne methyl groups uye inonyungudutsa zvakanyanya. Inogona kuumba jira repamusoro pamusoro pezvidimbu zvemortar kudzivirira kubuda kwemvura uye kugadzirisa zvinobudirira kuchengetwa kwemvura mumortar. Panguva imwe chete, HPMC inogonawo kusangana nemamorekuru emvura kuburikidza nezvisungo zvehydrogen, zvichiita kuti zviomere mamorekuru emvura kuparadzaniswa nezvidimbu zvemortar. Nokudaro, HPMC ine simba guru pakuvandudza kuchengetwa kwemvura mumortar.
HPMC inogonawo kuvandudza kushanda kwedhaka. Kushanda kwedhaka kunoreva nyore kushandisa dhaka uye kuumbwa panguva yekuvaka. Kana dhaka rikashanda zviri nani, zviri nyore kuti vashandi vekuvaka vadzore chimiro uye kugadzikana kwedhaka panguva yekuvaka. Kushanda zvakanaka kwedhaka kunogonawo kuderedza huwandu hwepombi dzemhepo dziri muchigadzirwa chapera, zvichiita kuti chimiro chive chakasimba uye chakakora.
HPMC inogona kuvandudza kushanda kwedhaka nekuderedza kusimba kwedhaka. Huremu hweHPMC hwakanyanya, uye zviri nyore kugadzira hydrogen bonds nemamorekuru emvura, zvichikonzera kusimba kwakanyanya. Zvisinei, HPMC inogona kuomeswa kuita zvidimbu zvidiki pasi pesimba rekuchekwa, zvichideredza kusimba kwedhaka. Naizvozvo, kana vashandi vekuvaka vakabata dhaka, zvidimbu zveHPMC zvichaputswa, zvichiita kuti dhaka riwedzere kunyorova uye rive nyore kuvaka. Uyezve, mapoka ehydrophilic muHPMC anogonawo kugadzira firimu repamusoro pamusoro pezvidimbu zvedhaka, kuderedza kukweshana pakati pezvidimbu zvedhaka, uye kuwedzera kuvandudza kushanda kwedhaka.
HPMC inogona kunatsiridza kunamira kwedhaka. Kunamira kwedhaka kunoreva kugona kwayo kunamira zvakasimba pamusoro pedhaka. Kunamira kwakanaka kunogona kuumba kubatana kwakasimba uye kwakavimbika pakati pedhaka nedhaka, zvichiita kuti chigadzirwa chapera chigare kwenguva refu. Pamusoro pezvo, kunamira kwakanaka kunogonawo kuita kuti pamusoro pechigadzirwa chapera pave panyoro uye pakanaka.
HPMC inogona kuvandudza kunamira kwedhaka nenzira dzakasiyana-siyana. Chekutanga, HPMC inogona kugadzira firimu repamusoro pamusoro pedhaka mushure mekuvakwa kwedhaka, izvo zvinogona kuderedza kushushikana kwepamusoro pedhaka uye kuita kuti zvive nyore kuti dhaka rinamire kunedhaka. Chechipiri, zvidimbu zveHPMC zvinogonawo kugadzira chimiro chenetwork pamusoro pedhaka, kuwedzera nzvimbo yekubatana pakati pedhaka nedhaka, uye kuwedzera kunamira kwedhaka. Uyezve, mapoka emvura anonyungudutsa muHPMC anogona kusanganiswa nemamorekuru emvura, izvo zvinogona kuwedzera chiyero chemvura nesimende chedhaka uye kuwedzera simba rekubatana kwedhaka.
Kushandiswa kweHPMC mudura kune zvakanakira zvakawanda zvakaita sekuchengetedza mvura, kugona kushanda, uye kunamira zviri nani. Zvakanakira izvi hazvingobatsiri vashandi vekuvaka chete, asiwo zvine simba rakanaka pamhando yese yechigadzirwa chapera. Nekuvandudzwa kwesainzi netekinoroji, zvinotendwa kuti HPMC ichaita basa rakakosha muindasitiri yekuvaka uye ichapa zvinhu zvinoshanda uye zvakachengeteka kuindasitiri yekuvaka.
Nguva yekutumira: Gunyana-01-2023