MC imethyl cellulose, iyo inogadzirwa ne cellulose ether nekushandisa donje rakanatswa ne alkali, uchishandisa methane chloride se etherification agent, uye ichipinda muzviitiko zvakasiyana-siyana. Kazhinji, mwero wekutsiva i1.6 ~ 2.0, uye kunyunguduka kwakasiyanawo nemwero wakasiyana wekutsiva. Ndeye non-ionic cellulose ether.
(1) Kuchengetwa kwemvura kwemethyl cellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, kupfava kwezvikamu uye mwero wekunyungudika. Kazhinji, kana huwandu hwekuwedzera huri hukuru, kupfava kuri kudiki, uye viscosity yakakura, mwero wekuchengetedza mvura wakakwira. Pakati pazvo, huwandu hwekuwedzera hune simba guru pahuwandu hwekuchengetedza mvura, uye mwero we viscosity hauenderane zvakananga nemwero wekuchengetedza mvura. Mwero wekunyungudika unonyanya kuenderana nehuwandu hwekuchinja kwepamusoro kwezvikamu zve cellulose uye kupfava kwezvikamu. Pakati peethers dze cellulose dziri pamusoro apa, methyl cellulose uye hydroxypropyl methyl cellulose zvine mwero wekuchengetedza mvura wakakwira.
(2) Methylcellulose inonyungudika mumvura inotonhora, uye zvichave zvakaoma kunyungudika mumvura inopisa. Mvura yayo inonyungudika zvikuru muhuwandu hwepH=3~12. Inoenderana zvakanaka nestarch, guar gum, nezvimwewo uye masurfactants akawanda. Kana tembiricha yasvika patembiricha yegelation, gelation inoitika.
(3) Kuchinja kwetembiricha kuchakanganisa zvakanyanya mwero wekuchengetedza mvura yemethyl cellulose. Kazhinji, tembiricha yakakwira, kuchengetedza mvura kwakaipa. Kana tembiricha yemortar ikapfuura 40°C, kuchengetedza mvura yemethyl cellulose kuchaderera zvakanyanya, zvichikanganisa zvikuru kuvaka mortar.
(4) Methyl cellulose ine simba guru pakuvakwa nekunamirwa kwedhaka. "Kunamirwa" pano kunoreva simba rinonamirwa riri pakati pechishandiso chemushandi nemadziro, kureva kuti, kuramba kuchekwa kwedhaka. Kunamirwa kwacho kwakanyanya, kuramba kuchekwa kwedhaka kwakakura, uye simba rinodiwa nevashandi mukushandiswa kwacho rakakurawo, uye mashandiro ekuvaka kwedhaka haana kunaka. Kunamirwa kweMethyl cellulose kuri padanho repakati muzvigadzirwa zve cellulose ether.
HPMC ihydroxypropyl methylcellulose, inova ether yakasanganiswa isina ionic cellulose yakagadzirwa nedonje rakacheneswa mushure mekugadziriswa kwealkali, ichishandisa propylene oxide nemethyl chloride se etherification agents, uye kuburikidza nematanho akasiyana-siyana. Dhigirii rekutsiva rinowanzova 1.2 ~ 2.0. Hunhu hwayo hwakasiyana nekuda kwehuwandu hwakasiyana hwe methoxyl nehuwandu hwe hydroxypropyl.
(1) Hydroxypropyl methylcellulose inonyungudika nyore nyore mumvura inotonhora, uye inosangana nematambudziko pakunyungudika mumvura inopisa. Asi tembiricha yayo ye gelation mumvura inopisa yakakwira zvakanyanya kupfuura yemethyl cellulose. Kunyungudika mumvura inotonhora kwakawedzerawo zvikuru kana tichienzanisa nemethyl cellulose.
(2) Kuwanda kwehydroxypropyl methylcellulose kwakabatana nehuremu hwayo hwemamorekuru, uye kana huremu hwemamorekuru hwakakura, kuwanda kwesimba. Tembiricha inokanganisawo kuwanda kwayo, sezvo tembiricha ichiwedzera, kuderera kwesimba. Zvisinei, kuwanda kwayo kune tembiricha yakaderera pane methyl cellulose. Mhinduro yayo inogara yakagadzikana kana yakachengetwa patembiricha yemumba.
(3) Hydroxypropyl methylcellulose inogara yakasimba kune acid nealkali, uye mvura yayo inogadzikana zvakanyanya muhuwandu hwe pH = 2 ~ 12. Caustic soda nemvura ye lime hazvina zvazvinobatsira pakushanda kwayo, asi alkali inogona kukurumidzisa kunyungudika kwayo uye kuwedzera viscosity yayo. Hydroxypropyl methylcellulose inogara yakasimba kune common salts, asi kana huwandu hwemunyu hwakakwira, viscosity ye hydroxypropyl methylcellulose solution inowanzo kuwedzera.
(4) Kuchengetwa kwemvura kwehydroxypropyl methylcellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, nezvimwewo, uye mwero wayo wekuchengetedza mvura pasi pehuwandu hwayo hwekuwedzera hwakakwira kupfuura hwemethyl cellulose.
(5) Hydroxypropyl methylcellulose inogona kusanganiswa nepolymer inonyungudika mumvura kuti igadzire mhinduro yakafanana uye yakakwira ye viscosity. Zvakadai se polyvinyl alcohol, starch ether, vegetable gum, nezvimwewo.
(6) Kubatana kwehydroxypropyl methylcellulose mukugadzirwa kwemortar kwakakwirira kupfuura kwemethylcellulose.
(7) Hydroxypropyl methylcellulose ine simba riri nani rekudzivirira ma enzymes kupfuura methylcellulose, uye mhinduro yayo hainyanyi kukanganiswa nema enzymes kupfuura methylcellulose.
Nguva yekutumira: Kubvumbi-17-2023