MC imethyl cellulose, inowanikwa nekushandisa donje rakanatswa nealkali, uchishandisa methyl chloride sechinhu chinopa ether, uye kugadzira cellulose ether kuburikidza nekuita zvakasiyana-siyana. Kazhinji, mwero wekutsiva i1.6 ~ 2.0, uye kunyunguduka kwakasiyanawo nemwero wakasiyana wekutsiva. Inoshanda kune non-ionic cellulose ether.
(1) Kuchengetwa kwemvuramethyl cellulosezvinoenderana 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 weviscosity hauenderane nehuwandu hwehuwandu hwekuchengetedza mvura. Mwero wekunyungudika unonyanya kutsamira padanho rekuchinja kwepamusoro kwezvikamu zve cellulose uye kupfava kwezvikamu. Pakati peethers dze cellulose dziri pamusoro apa, methyl cellulose nehydroxypropyl methyl cellulose zvine mwero wekuchengetedza mvura wakakwira.
(2) Methylcellulose inonyungudika mumvura inotonhora, asi yakaoma kunyungudika mumvura inopisa, uye mvura yayo inonyungudika zvikuru muhuwandu hwepH=3~12. Inoenderana zvakanaka nestarch, guar gum, nezvimwewo uye masurfactants akawanda. Kana tembiricha yasvika patembiricha yegelation, chiitiko chegelation chinoitika.
(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 kuchawedzera kuipa, izvo zvichakanganisa zvakanyanya kushanda kwemortar.
(4) Methyl cellulose ine simba guru pakushanda nekunamatira kwedhaka. "Kunamatira" pano zvinoreva kubatana kunonzwa pakati pechishandiso chemushandi nemadziro, kureva kuti, kuramba kunamatira kwedhaka. Kunamatira kwakakura, kuramba kunamatira kwedhaka kwakakura, uye simba rinodiwa nevashandi mukushandiswa kwaro rakakurawo, uye kuvakwa kwedhaka kwakashata. Kunamatira kweMethylcellulose kuri padanho repakati muzvigadzirwa zve cellulose ether.
HPMC ihydroxypropyl methyl cellulose, inova ether yakasanganiswa isina ionic cellulose yakagadzirwa nedonje rakanatswa mushure mekugadziriswa kwealkali, ichishandisa propylene oxide nemethyl chloride se etherifying agents, uye kuburikidza nematanho akasiyana-siyana. Dhigirii rekutsiva rinowanzova 1.2 kusvika 2.0. Hunhu hwayo hunosiyana zvichienderana nehuwandu hwe methoxyl uye huwandu hwe hydroxypropyl.
(1) Hydroxypropyl methylcellulose inonyungudika nyore nyore mumvura inotonhora, asi inosangana nematambudziko pakunyungudika mumvura inopisa. Asi tembiricha yayo ye gelation mumvura inopisa yakakwira zvakanyanya kupfuura yemethyl cellulose. Kunyungudika mumvura inotonhora kwakavandudzikawo zvikuru kana tichienzanisa nemethyl cellulose.
(2) Kuwanda kwe hydroxypropyl methylcellulose kwakabatana nehukuru hwehuremu hwayo, uye kana huremu hwemamorekuru hwakakura, kuwanda kwe viscosity. Tembiricha inokanganisawo kuwanda kwayo, sezvo tembiricha ichiwedzera, kuderera kwe viscosity. Asi kuwanda kwayo hakunyanyi kukanganiswa nekupisa kwakanyanya kupfuura 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. Hydroxypropyl methylcellulose inogara yakasimba kune common salts, asi kana huwandu hwemunyu hwakwira, viscosity ye hydroxypropyl methylcellulose solution inowanzo kuwedzera.
(4) Kuchengetwa kwemvurahydroxypropyl methylcellulosezvinoenderana nehuwandu hwayo hwekuwedzera, viscosity, nezvimwewo. Mwero wekuchengetedza mvura pasi pehuwandu hwakafanana hwekuwedzera wakakwira kupfuura wemethyl cellulose.
(5) Hydroxypropyl methylcellulose inogona kusanganiswa nepolymer inonyungudika mumvura kuti igadzire mhinduro ine viscosity yakafanana uye yakakwira. Zvakadai sepolyvinyl alcohol, starch ether, vegetable gum, nezvimwewo.
(6) Kubatana kwehydroxypropyl methylcellulose mukugadzirwa kwemortar kwakakwirira kupfuura kwemethylcellulose.
(7) Hydroxypropyl methylcellulose inodzivirira ma enzyme zviri nani kupfuura methylcellulose, uye mukana wayo wekubvisa ma enzymes wakaderera pane wemethylcellulose.
Nguva yekutumira: Kubvumbi-28-2024