Pendi uye machira zvinhu zvakakosha muindasitiri yemazuva ano uye kuvaka, uye zvinoshandiswa zvakanyanya kuchengetedza nekushongedza nzvimbo. Nekudaro, kuitira kuti ive nechokwadi chekuti zvinhu izvi zvine kuita kwakanaka kwekuvaka, kufukidzwa kwakafanana uye kwakagadzikana kuchengetedza kuita pasi penzvimbo dzakasiyana dzekuvaka, kudzorwa kwezvinhu zverheological kunonyanya kukosha. Hydroxypropyl Methyl Cellulose (HPMC), sechinhu chinowanzo shandiswa mvura-soluble polymer compound, inoita basa rakakosha mukuvandudza rheological properties yependi uye mapendi.
Basic zvimiro zveHPMC
HPMC ndeye yakasikwa cellulose derivative, iyo inogadzirirwa nekutsiva mamwe mapoka ehydroxyl mumamorekuru e cellulose ne methoxy uye hydroxypropoxy mapoka. Hunhu hweHPMC hunoita kuti ive yakanaka solubility mumvura uye kuita läpinäkyvä or translucent colloidal solutions. Mukuwedzera, ine yakasimba viscosity regulation effect, yakanaka kuchengetedza mvura uye inoumba firimu yunifomu, iyo inoita kuti ive imwe yezvakanakisa zvinowedzera mumhizha yependi uye yekuputira.
Mechanism yekuita kweHPMC mumapende uye machira
Regulation of rheological properties Rheological properties inoreva deformation uye kuyerera maitiro ezvinyorwa pasi pemasimba ekunze. Kune pendi uye machira, akakodzera rheological zvivakwa anobatsira kuvandudza mashandiro avo ekuvaka uye kudzivirira matambudziko akadai sekudonha uye kuputika. HPMC ine thickening maitiro mumvura-based systems. Iyo inowedzera viscosity yekuputira nekugadzira network network, nekudaro inovandudza iyo anti-sagging kuita kweiyo coating panguva yekuvaka, kuitira kuti igone kuvharwa zvakaenzana pamhepo yakatwasuka pasina kuyerera kwakanyanya.
Kunyanya, iyo macromolecular cheni yeHPMC inoumba network dhizaini mune mhinduro, iyo inogona kuwedzera viscosity yehurongwa payakaderera shear rates uye kuratidza shear kuonda maitiro pakakwirira shear mitengo. Izvi zvinoreva kuti kana uchikwesha kana kupfapfaidza, viscosity yepende inodzikira nekuda kwesimba rekunze, ichiita kuti kubhurasho kuve nyore, uye mushure mekunge simba rekunze ramira, viscosity ichakurumidza kupora kudzivirira iyo yekupfeka kubva pakuyerera uye kudonha. Iyi shear thinning chivakwa inovandudza zvakanyanya kuvaka kwependi uye mapendi.
Kuchengetwa kwemvura uye kugadzikana HPMC inewo simba rekuchengetedza mvura, iyo inogona kunyatso wedzera nguva yekuomeswa kwepende uye mapendi, kuve nechokwadi kuti kuvhara hakuzotseki nekuda kwekurasikirwa kwemvura yakawandisa panguva yekuoma. Ichi chivakwa chinonyanya kukosha munzvimbo dzinopisa uye dzakaoma dzekuvaka nekuti inodzivirira mvura iri mupende kuti isanyunguduke nguva isati yakwana, inova nechokwadi chekuti iyo yekupfeka inowoma zvakaenzana, uye nekudaro inovandudza kunamatira uye kutsvedzerera kwependi.
HPMC inogona kuvandudza kugadzikana kwependi. Nekuda kwekuita kwayo kukora, inogona kudzivirira pendi kubva pakudzika uye kugadzika panguva yekuchengetedza kwenguva refu, kuchengetedza kufanana kwehurongwa, uye kuwedzera hupenyu hwesherufu yepende.
Kuvandudza pigment dispersion Mukugadzirwa kwependi, pigment ndizvo zvakakosha zvinotaridza ruvara uye kuvhara. Kuti ive nechokwadi chekufanana kwemavara uye kufukidzwa kwepamusoro kwepende, iyo pigment inofanirwa kuparadzirwa zvakaenzana muhurongwa. Kuwedzerwa kweHPMC kunogona kuvandudza kupararira kwepigment, kuitira kuti pigment particles irambe iri mumamiriro akanaka ekusimudzika muhurongwa hwepende, kudzivirira zvikamu kubva pakugadzirisa, uye kuve nechokwadi chekuenderana kwemavara ekuputira. Uye zvakare, kunyorova kweHPMC kunoita kuti inyatso kudzikisa kuunganidzwa kwe pigment particles uye kunatsiridza simba rekupenda uye kupenya kwepende.
Dzivirira kupfapfaidza nemavara ebhurashi Panguva yekuvaka, kunyanya nekupfapfaidza nekukwesha, pendi nemabhanditi zvinowanzosangana nedambudziko rekupfapfaidza nemabhurasho. Kusasa kwete kungorasa zvinhu chete, asiwo kunogona kusvibisa nzvimbo yekuvaka, nepo mabrashi mamaki anokanganisa kutsvedzereka uye aesthetics yekuvhara kwekupedzisira. HPMC inogona kuderedza kupfachuka kwependi panguva yekuvaka nekugadzirisa viscosity uye fluidity yepende, uye panguva imwechete inoita kuti pendi ifambe zvakanaka pamusoro uye kuderedza chizvarwa chebrashi mamaki.
Mhedzisiro pakuumbwa kwekuputira Iyo nzira yekugadzira yekuputira inobatwa neiyo rheological properties uye kuomesa kwepende. Nekuda kwezvakanaka zvekugadzira firimu uye kuchengetedza mvura, HPMC inogonesa iyo pendi kuti igadzire yakawedzera yunifomu uye yakaomeswa coating panguva yekuomeswa, inovandudza kutsemuka uye kuramba kwemamiriro ekunze kwejasi. Panguva imwecheteyo, inogonawo kuwedzera kusungirirwa kwechifukidzo, kuitira kuti chifukidzo chive nekugadzirisa zvinhu zviri nani pamusoro pezvikamu zvakasiyana-siyana uye kuwedzera hupenyu hwebasa rejasi.
Kushandiswa kweHPMC mumhando dzakasiyana dzemachira
HPMC inogona kushandiswa zvakanyanya mumhando dzakasiyana dzekupotera senge pendi yemvura, pendi yelatex, uye pendi yekuvaka. Pamvura-yakavakirwa pendi, HPMC inogona zvakanyanya kunatsiridza viscosity yayo, kuyera uye kuita kwekuvaka; muLatex pendi, kukora uye kuchengetedza mvura zvivakwa zveHPMC zvinonyanya kutariswa, zvinobudirira kuvandudza mashandiro ekuvaka uye kunaka kwependi. Mumunda wekugadzira machira, HPMC inosimudzira iyo inopesana-sagging uye inopesana-kupuruzira zvivakwa zvepende nekugadzirisa rheological zvimiro zvependi, ichienderana nezvinodiwa zvekuvaka-nzvimbo yakakura.
HPMC, seyakagwinya uye rheology modifier, inoita basa rakakosha mupendi uye machira. Haikwanise kungovandudza rheological properties yejasi, kuve nechokwadi chekufanana uye kushanda kwechifukidzo panguva yekuvaka, asiwo kuvandudza hutano hwekupedzisira hwekuputira uye kuwedzera kuchengetedza uye hupenyu hwebasa rekuvhara. Nekuenderera mberi kwekusimudzira indasitiri yemazuva ano yekupfekedza, kushandiswa kweHPMC kuchawedzera kuwanda uye kuve kwakakosha kukurudzira kuvandudza mashandiro emajasi.
Nguva yekutumira: Sep-29-2024