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Hydroxypropyl methyl cellulose habka wax soo saarka HPMC iyo codsiyada

Hydroxypropyl methyl cellulose HPMC , oo sidoo kale loo yaqaan hydroxypromellose, waa caddaan ama budo ether cellulose ah oo caddaan ah oo leh biyo qabow iyo biyo kulul oo la mid ah methyl cellulose.Kooxda Hydroxypropyl iyo kooxda methyl waa ether bond iyo giraanta gulukooska anhydrous ee cellulose oo la isku daray, waa nooc ka mid ah cellulose aan ionic ahayn oo isku qasan.Waa semi-synthetic, aan firfircoonayn, polymer viscoelastic ah oo caadi ahaan loo isticmaalo saliidaha indhaha, ama ka-bixiye ama ka-qaade dawooyinka afka.

1. Habka wax soo saarka

Saxarka Kraft oo leh αcellulose ka kooban 97%, viscosity gudaha 720mL/g iyo celceliska dhererka fiber ee 2.6mm ayaa lagu qooyay 49% NaOH xal 40℃ 50 ilbiriqsi.Dabadeed saxarka ayaa la soo saaray si looga saaro 49% NaOH ee dheeraadka ah si loo helo alkali cellulose.Saamiga miisaanka (49% NaOH xal aqueous) ilaa (qayb adag oo saxarka ah) ee tallaabada impregnation waxay ahayd 200. Saamiga miisaanka NaOH ee cellulose alkali ilaa adag ee saxarka waa 1.49.cellulose-ka alkali-ka ah ee sidaas lagu helay (20kg) waxaa lagu dhejiyaa fal-celiyaha cadaadiska jaksan ee kicinta gudaha, ka dibna la nadiifiyo oo lagu nadiifiyo nitrogen si si waafi ah looga saaro ogsijiinta kicinta.Kadibna, heerkulka reactor-ka ayaa la xakameeyey 60 ℃ halka karitaanka gudaha la sameeyay.

Dabadeed 2.4kg dME ayaa lagu daray heerkulka ku jira reactor-ka ayaa la xakameeyey ilaa 60 ℃.Ka dib marka lagu daro dimethyl ether, chloride methylene ayaa lagu daray si loo sameeyo saamiga molar ee methylene chloride ilaa NaOH ee cellulose alkaline 1.3, propylene oxide ayaa lagu daray si loo sameeyo saamiga miisaanka propylene oxide si adag oo ku jira saxarka 1.97, iyo heerkulka ku jira reactor. waxaa la xakameeyey laga bilaabo 60 ℃ ilaa 80 ℃.Ka dib marka lagu daro chloromethane iyo propylene oxide, heerkulka ku jira reactor-ka waxaa la xakameeyey laga bilaabo 80 ℃ ilaa 90 ℃.Intaa waxaa dheer, falcelintu waxay socotay 20 daqiiqo at 90 ℃.

Gaaska ayaa markaa laga soo saaraa reactor-ka waxaana laga saarayaa reactor-ka cayriin hydroxypropyl methyl cellulose.Heerkulka cayriin hydroxypropyl methyl cellulose wuxuu ahaa 62 ℃.Cabbir isku-darka 50% cabbirka walxaha ee miisaanka isugaynta ku salaysan qaybinta cabbirka walxaha ku salaysan saamiga hydroxypropyl methyl cellulose cayriin iyada oo loo marayo furayaasha shanta shaandheynta, mid kastaa wuxuu leeyahay cabbir kala duwan oo furitaanka.

Natiijo ahaan, celceliska cabbirka walxaha aan fiicneyn wuxuu ahaa 6.2mm.Hydroxypropyl methyl cellulose ceyriin ah oo la helay ayaa lagu soo bandhigay cajiinka biaxial joogto ah (KRC kneader S1, L/D = 10.2, mugga gudaha 0.12 L, xawaaraha wareegga 150rpm) xawaare dhan 10kg/saacaddii, waxaana la helay cayriin hydroxypropyl methyl cellulose.Natiijadu waxay tahay cabbirada la midka ah iyadoo la adeegsanayo 5 shaashad oo leh cabbirro kala duwan oo furitaan ah, celceliska cabbirka walxaha wuxuu ahaa 1.4mm.Ku darista 80 ℃ biyo kulul oo ah hydroxypropyl methyl cellulose cayriin oo burburay oo ku jira haanta iyada oo la xakameynayo heerkulka jaakadda.qadarka saamiga miisaanka ee hydroxypropyl methyl cellulose cayriin ah oo burburay ilaa wadarta guud ee slurry waa 0.1, iyo slurry waa la helay.slurry waxaa lagu walaaqay heerkul joogto ah oo ah 80 ℃ 60 daqiiqo.

Ka dib, dareeraha waxaa la siiyaa xawaaraha wareega ee 0.5 RPM iyo shaandhada cadaadiska rotary ee horay loo sii kululeeyay ( alaabada BHS Sonthofen).Heerkulka grout waa 93 ℃.Isticmaal bamka si aad u keento dareeraha, cadaadiska dareeraha bamka waa 0.2mpa.Cabbirka furitaanka shaandhada cadaadiska wareega waa 80μm, aagga shaandhada waa 0.12m2.Soodhadhka la keeno shaandhada cadaadiska wareega ayaa lagu sifeeyaa shaandhada waxaana loo beddelaa keega filter.Keega shaandhada ka soo baxa waxaa lagu bixiyaa uumiga 0.3mpa iyo 95℃ biyo kulul oo leh miisaan miisaankiisu yahay 10.0 ilaa qaybta adag ee HYDROXYpropyl methyl cellulose ee la dhaqay, ka dibna lagu sifeeyo shaandhada.

Biyaha kulul waxaa lagu bixiyaa bamka cadaadiska dareeraha ah ee 0.2mpa.Ka dib markii biyo kulul la keeno, uumiga 0.3mpa ayaa la bixiyaa.Dabadeed, ka dib marka la dhaqo alaabta waxaa laga saarayaa dusha shaandhada iyada oo la xoqo oo laga soo saaro mashiinka dharka.Tallaabooyinka laga soo bilaabo bixinta dareeraha ilaa soo dajinta alaabta la dhaqay si joogto ah ayaa loo fuliyaa.Sida lagu cabiray kulaylka - hygrometer qalajinta, nuxurka biyaha ee alaabta la dhaqay ayaa sidaas lagu sii daayay 52.8%.Alaabooyinka la dhaqay ee laga soo saaray shaandhada cadaadiska wareega ayaa waxaa engejiyey qalajiye hawo 80℃, waxaana lagu burburiyay warshada Guusha si loo helo hydroxypropyl methyl cellulose.

2.Acodsi

Alaabta HPMC waxa loo isticmaalaa dhumucdiye, kala firdhiye, xidheyaal, emulsifier iyo xasiliya warshadaha dharka.Sidoo kale si weyn loogu isticmaalo xabagta synthetic, petrochemical, ceramik, warqad, maqaar, daawo, cunto, waxyaalaha la isku qurxiyo iyo warshadaha kale.


Waqtiga boostada: Mar-23-2022