Hydroxypropyl methylcellulose (zita reINN: Hypromellose), zvakare rakarerutswa se hypromellose (hydroxypropyl methylcellulose, yakapfupikiswa seHPMC), imhando ye nonionic cellulose mixed ethers. Ipolymer ye viscoelastic, isingashandiswi, inowanzoshandiswa semafuta mumaziso, kana semubatsiri kana mubatsiri mumishonga inonwiwa, uye inowanikwa muzvigadzirwa zvakasiyana-siyana zvemabhizinesi.
Sechinowedzerwa muchikafu, hypromellose inogona kuita mabasa anotevera: emulsifier, thickener, suspending agent uye chinotsiva gelatin yemhuka. Kodhi yayo (E-code) muCodex Alimentarius iE464.
Hunhu hwemakemikari:
Chigadzirwa chakapedzwa chehydroxypropyl methylcelluloseihupfu chena kana kuti chena yakapfava, uye saizi yechinhu ichi inopfuura nemusefa ine maburi makumi masere. Chiyero chehuwandu hwemethoxyl nehydroxypropyl yechinhu chapera chakasiyana, uye viscosity yakasiyana, saka inova mhando dzakasiyana-siyana dzine mashandiro akasiyana. Ine hunhu hwekunyungudika mumvura inotonhora uye isinganyungudike mumvura inopisa yakafanana nemethyl cellulose, uye kunyungudika kwayo muzvinhu zvinonyungudika kunopfuura kwemvura. Inogona kunyungudika muanhydrous methanol neethanol, uye inogonawo kunyungudika muchlorine hydrocarbons dzakadai sedichloro methane, trichloroethane, uye zvinhu zvinonyungudika zvakaita seacetone, isopropanol, uye diacetone alcohol. Kana yanyungudika mumvura, inosanganiswa nemamorekuru emvura kuti igadzire colloid. Yakasimba kune acid nealkali, uye haikanganisike muhuwandu hwepH=2~12. Hypromellose, kunyangwe isiri chepfu, inobvira moto uye inoita zvine simba ne oxidizing agents.
Kuwanda kwezvigadzirwa zveHPMC kunowedzera nekuwedzera kwehuwandu uye huremu hwemamorekuru, uye kana tembiricha yakwira, kuwanda kwayo kunotanga kudzikira. Kana yasvika patembiricha yakati, kuwanda kwayo kunobva kwangoerekana kwakwira uye kukwirira kwayo kunoitika. Mhinduro yayo yemvura inogara yakagadzikana patembiricha yemumba, kunze kwekuti inogona kukanganiswa nema enzymes, uye kuwanda kwayo hakuna dambudziko rekuora. Ine hunhu hwakakosha hwekupisa, hunhu hwakanaka hwekugadzira firimu uye kushanda kwepamusoro.
Kugadzira:
Mushure mekunge cellulose yabatwa nealkali, anion yealkoxy inogadzirwa nekubviswa kweprotonation yeboka rehydroxyl inogona kuwedzera propylene oxide kuti igadzire hydroxypropyl cellulose ether; inogonawo kusanganiswa nemethyl chloride kuti igadzire methyl cellulose ether. Hydroxypropyl methylcellulose inogadzirwa kana zvese izvi zvichiitwa panguva imwe chete.
Kushandisa:
Kushandiswa kwehydroxypropyl methylcellulose kwakafanana nekushandiswa kwemamwe ma ether e cellulose. Inonyanya kushandiswa se dispersant, suspending agent, thickener, emulsifier, stabilizer uye adhesive muminda yakasiyana-siyana. Yakakwirira kupfuura mamwe ma ether e cellulose maererano nekunyunguduka, kupararira, kujeka uye kuramba ma enzyme.
Muindasitiri yezvekudya nemishonga, inoshandiswa sechinhu chinowedzera. Inoshandiswa sechinamira, chinosimbisa, chinonyungudutsa, chinobvisa chepfu, chinosimbisa uye chinosanganisa chepfu. Haina chepfu, haina kukosha kwezvekudya, uye haina shanduko mukugadzirwa kwemuviri.
Pamusoro pe,HPMCInoshandiswa mukugadzira resin yakagadzirwa, petrochemicals, ceramics, papermaking, dehwe, cosmetics, coatings, zvinhu zvekuvaka uye ma printing plates anonzwa chiedza.
Nguva yekutumira: Kubvumbi-25-2024