Amagama angukhiye: i-hydroxypropyl methyl cellulose; I-PVC eneziqu eziphezulu ze-polymerization; ukuhlolwa okuncane; i-polymerization; ukwenziwa kwasendaweni.
Ukusetshenziswa kweChina i-hydroxypropyl methylcelluloseesikhundleni sokungeniswa kwamanye amazwe ekukhiqizeni i-PVC ene-polymerization degree ephezulu yethulwa. Imiphumela yezinhlobo ezimbili ze-hydroxypropyl methylcellulose ezimpahleni ze-PVC ezineziqu ze-polymerization zaphenywa. Imiphumela yabonisa ukuthi kwakungenzeka ukufaka esikhundleni se-hydroxypropyl methyl cellulose esikhundleni semali engenisiwe.
Izinsalela ze-PVC ze-high-degree-of-polymerization zibhekisela ezinsikeni ze-PVC ezinezinga eliphakathi le-polymerization elingaphezu kwe-1,700 noma isakhiwo esixhumene kancane phakathi kwama-molecule. Uma kuqhathaniswa ne-resin evamile ye-PVC, i-polymerization ye-PVC resin inokusimama okuphezulu, isethi encane yokucindezelwa, ukumelana nokushisa okuhle, ukumelana nokuguga, ukumelana nokukhathala nokumelana nokugqoka. Iyindawo ekahle yerabha futhi ingasetshenziswa emigqeni yokuvala imoto, izintambo nekhebula, ama-catheter ezokwelapha, njll.
Indlela yokukhiqiza ye-PVC enezinga eliphezulu le-polymerization ngokuyinhloko i-polymerization yokumiswa. Ekukhiqizeni indlela yokumiswa, i-dispersant iyinhlangano ewusizo ebalulekile, futhi uhlobo lwayo kanye nenani kuzothinta ngokuqondile ukuma kwezinhlayiyana, ukusabalalisa usayizi wezinhlayiyana, nokumuncwa kwe-plasticizer ye-resin ye-PVC eqediwe. Amasistimu okusabalalisa asetshenziswa kakhulu amasistimu otshwala e-polyvinyl kanye ne-hydroxypropyl methylcellulose kanye nezinhlelo zokuhlakazwa kwe-polyvinyl alcohol composite, futhi abakhiqizi basekhaya basebenzisa kakhulu lezi zakamuva.
1 Izinto zokusetshenziswa eziyinhloko kanye nemininingwane
Izinto zokusetshenziswa eziyinhloko kanye nokucaciswa okusetshenziswe ekuhlolweni kukhonjiswe kuThebula 1. Kungabonakala kuThebula 1 ukuthi i-hydroxypropyl methylcellulose yasekhaya ekhethwe kuleli phepha ihambisana ne-hydroxypropyl methylcellulose engenisiwe, ehlinzeka ngemfuneko yokuhlolwa kokufaka esikhundleni salokhu. iphepha.
2 Okuqukethwe kokuhlola
2. 1 Ukulungiswa kwesisombululo se-hydroxypropyl methylcellulose
Thatha inani elithile lamanzi angcolile, ulifake esitsheni bese usishisa ku-70 ° C, futhi kancane kancane wengeze i-hydroxypropyl methylcellulose ngaphansi kokugqugquzela njalo. I-cellulose intanta emanzini ekuqaleni, bese ihlakazeka kancane kancane ize ihlanganiswe ngokulinganayo. Pholisa isisombululo sevolumu.
Ithebula 1 Izinto zokusetshenziswa eziyinhloko kanye nokucaciswa kwazo
| Igama lempahla eluhlaza | Ukucaciswa |
| I-vinyl chloride monomer | Umphumela wekhwalithi≥99. 98% |
| Amanzi ahlanjululwe usawoti | I-Conductivity≤10. 0 μs/cm, pH value 5. 00 to 9. 00 |
| I-Polyvinyl alcohol A | I-Alcoholysis degree 78. 5% ukuya ku-81. 5%, okuqukethwe komlotha≤0. 5%, indaba eguquguqukayo≤5. 0% |
| I-Polyvinyl alcohol B | I-Alcoholysis degree 71. 0% ukuya ku-73. 5%, i-viscosity 4. 5 kuya ku-6. 5mPa s, indaba eguquguqukayo≤5. 0% |
| I-Polyvinyl alcohol C | I-Alcoholysis degree 54. 0% ukuya ku-57. 0% , viscosity 800 ~ 1 400mPa s, okuqukethwe okuqinile 39. 5% kuya ku-40.5% |
| I-hydroxypropyl methylcellulose A engenisiwe | I-Viscosity 40 ~ 60 mPa s, ingxenyenamba ye-methoxyl mass 28% ~ 30%, ingxenyenamba ye-hydroxypropyl engu-7% ~ 12%, umswakama≤5. 0% |
| I-hydroxypropyl methylcellulose B yasekhaya | I-Viscosity 40 ~ 60 mPa · s, ingxenyenamba ye-methoxyl mass 28% ~ 30%, ingxenyenamba ye-hydroxypropyl engu-7% ~ 12%, umswakama ≤5. 0% |
| I-Bis(2-ethyl peroxydicarbonate) i-hexyl ester) | Ingxenyana enkulu [( 45 ~ 50) ± 1]% |
2. 2 Indlela yokuhlola
Emshinini wokuhlola omncane ongu-10 L, sebenzisa i-hydroxypropyl methylcellulose engenisiwe ukwenza izivivinyo zokubheka ukuze kutholwe ifomula eyisisekelo yokuhlola okuncane; sebenzisa i-hydroxypropyl methylcellulose yasekhaya esikhundleni se-hydroxypropyl methylcellulose engenisiwe ukuze ihlolwe; Imikhiqizo ye-PVC resin ekhiqizwe i-hydroxypropyl methylcellulose yaqhathaniswa, futhi nokwenzeka kokuthatha indawo ye-hydroxypropyl methylcellulose yasekhaya kwacwaningwa. Ngokwemiphumela yokuhlolwa okuncane, ukuhlolwa kokukhiqiza kwenziwa.
2. 3 Izinyathelo zokuhlola
Ngaphambi kokusabela, hlanza iketela le-polymerization, vala i-valve engezansi, engeza inani elithile lamanzi ahlanzekile, bese wengeza i-dispersant; vala isembozo seketela, vacuum ngemva kokudlula ukuhlolwa kwe-nitrogen pressure, bese wengeza i-vinyl chloride monomer; emva kokuvuselela okubandayo, engeza umqalisi; Sebenzisa amanzi ajikelezayo ukuze ukhuphule izinga lokushisa eketelani lifinyelele izinga lokushisa lokusabela, futhi wengeze isisombululo se-ammonium bicarbonate ngesikhathi ngesikhathi sale nqubo ukuze ulungise inani le-pH lesistimu yokusabela; lapho ingcindezi yokusabela yehlela ekucindezelweni okuchazwe kufomula, engeza isinqamuleli kanye ne-defoamer, bese ukhulula isisombululo. Umkhiqizo oqediwe we-PVC resin watholwa ngokufaka i-centrifugation nokomiswa, futhi wathathwa njengesampula ukuze uhlaziywe.
2. 4 Izindlela zokuhlaziya
Ngokwezindlela zokuhlola ezifanele ezisezingeni lebhizinisi, inombolo ye-viscosity, ukuminyana okusobala, izinto eziguquguqukayo (kuhlanganise namanzi) kanye nokumuncwa kwe-plasticizer ye-100 g PVC resin ye-PVC resin eqediwe kwahlolwa futhi kwahlaziywa; Isilinganiso sosayizi wezinhlayiyana ze-PVC resin yahlolwa; i-morphology yezinhlayiya ze-PVC resin yabonwa kusetshenziswa isibonakhulu se-electron yokuskena.
3 Imiphumela Nezingxoxo
3. 1 Ukuhlaziywa okuqhathanisayo kwekhwalithi yamaqoqo ahlukene e-PVC resin ku-polymerization esezingeni elincane
Cindezela okuthi 2. Ngokwendlela yokuhlola echazwe ku-4, iqoqo ngalinye lenhlaka ye-PVC eqediwe yahlolwa, futhi imiphumela ikhonjiswe kuThebula lesi-2.
Ithebula 2 imiphumela yamaqoqo ahlukene okuhlolwa okuncane
| Iqoqo | IHydroxypropyl methylcellulose | Ukuminyana okubonakalayo/(g/mL) | Isilinganiso sikasayizi wezinhlayiyana/μm | I-Viscosity/(mL/g) | Ukumuncwa kwe-Plasticizer ka-100 g we-PVC resin/g | Indaba eguquguqukayo/% |
| 1# | Ngenisa | 0.36 | 180 | 196 | 42 | 0.16 |
| 2# | Ngenisa | 0.36 | 175 | 196 | 42 | 0.20 |
| 3# | Ngenisa | 0.36 | 182 | 195 | 43 | 0.20 |
| 4# | Okwasekhaya | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | Okwasekhaya | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | Okwasekhaya | 0.36 | 167 | 194 | 43 | 0.22 |
Kungabonakala kuThebula lesi-2: Ubuningi obubonakalayo, inombolo ye-viscosity kanye nokumuncwa kwe-plasticizer ye-resin ye-PVC etholiwe kusondelene ngokusebenzisa i-cellulose ehlukene yokuhlola okuncane; umkhiqizo we-resin otholwe ngokusebenzisa ifomula yasekhaya ye-hydroxypropyl methylcellulose Isilinganiso sosayizi wezinhlayiyana mncane kancane.
Umfanekiso we-1 ubonisa izithombe ze-SEM zemikhiqizo ye-resin ye-PVC etholwe ngokusebenzisa i-hydroxypropyl methylcellulose ehlukene.
(1)—I-hydroxypropyl methylcellulose engenisiwe
(2)—I-hydroxypropyl methylcellulose yasekhaya
Umkhiwane. I-SEM engu-1 yama-resin akhiqizwa ku-10-L polymerizer phambi kwe-hydroxypropyl methyl cellulose ehlukile
Kungabonakala ku-Figure 1 ukuthi izakhiwo ezingaphezulu zezinhlayiya ze-PVC resin ezikhiqizwa ama-cellulose dispersants ahlukene ziyefana.
Ukufingqa, kungabonakala ukuthi i-hydroxypropyl methylcellulose yasekhaya ehlolwe kuleli phepha inamandla okushintsha i-hydroxypropyl methylcellulose engenisiwe.
3. 2 Ukuhlaziywa okuqhathaniswayo kwekhwalithi ye-PVC resin ene-polymerization degree ephezulu ekuhlolweni kokukhiqiza
Ngenxa yezindleko eziphezulu kanye nengozi yokuhlolwa kokukhiqiza, uhlelo oluphelele lokubuyisela lokuhlola okuncane alukwazi ukusetshenziswa ngokuqondile, ngakho-ke uhlelo luwukwandisa kancane kancane ingxenye ye-hydroxypropyl methylcellulose yasekhaya kufomula. Imiphumela yokuhlolwa kweqeqebana ngalinye ikhonjisiwe kuThebula lesi-3 elibonisiwe.
Ithebula 3 Imiphumela yokuhlolwa kwamaqoqo ahlukene okukhiqiza
| Iqoqo | m (China hydroxypropyl methyl cellulose): m (i-hydroxypropyl methyl cellulose engenisiwe) | Ukuminyana okubonakalayo/(g/mL) | Inombolo ye-Viscosity/(mL/g) | Ukumuncwa kwe-Plasticizer ka-100 g we-PVC resin/g | Indaba eguquguqukayo/% |
| 0# | 0:100 | 0.45 | 196 | 36 | 0.12 |
| 1# | 1.25:1 | 0.45 | 196 | 36 | 0.11 |
| 2# | 1.25:1 | 0.45 | 196 | 36 | 0.13 |
| 3# | 1.25:1 | 0.45 | 196 | 36 | 0.10 |
| 4# | 2.50:1 | 0.45 | 196 | 36 | 0.12 |
| 5# | 2.50:1 | 0.45 | 196 | 36 | 0.14 |
| 6# | 2.50:1 | 0.45 | 196 | 36 | 0.18 |
| 7# | 100:0 | 0.45 | 196 | 36 | 0.11 |
| 8# | 100:0 | 0.45 | 196 | 36 | 0.17 |
| 9# | 100:0 | 0.45 | 196 | 36 | 0.14 |
Kungabonakala kuThebula 3 ukuthi ukusetshenziswa kwe-hydroxypropyl methyl cellulose yasekhaya kuyenyuka kancane kancane kuze kube yilapho i-hydroxypropyl methyl cellulose yasekhaya ithatha indawo ye-hydroxypropyl methyl cellulose engenisiwe. Izinkomba eziyinhloko ezifana nokumuncwa kwe-plasticizer kanye nokuminyana okubonakalayo akuzange kuguquguquke kakhulu, okubonisa ukuthi i-hydroxypropyl methylcellulose yasekhaya ekhethwe kuleli phepha ingangena esikhundleni se-hydroxypropyl methylcellulose ekhiqizwayo.
4 Isiphetho
Ukuhlolwa kwe-hydroxypropyl methyl cellulose yasekhaya kudivayisi encane yokuhlola engu-10 L kukhombisa ukuthi inamandla okushintsha i-hydroxypropyl methyl cellulose engenisiwe; imiphumela yokuhlolwa esikhundleni sokukhiqiza ibonisa ukuthi i-hydroxypropyl methyl cellulose yasekhaya isetshenziselwa ukukhiqizwa kwe-resin ye-PVC, izinkomba eziyinhloko zekhwalithi ye-resin ye-PVC eqediwe kanye ne-hydroxypropyl methyl cellulose engenisiwe ayinawo umehluko omkhulu. Njengamanje, intengo ye-cellulose yasekhaya emakethe iphansi kunaleyo ye-cellulose engenisiwe. Ngakho-ke, uma i-cellulose yasekhaya isetshenziswa ekukhiqizeni, izindleko zezinsiza zokukhiqiza zingancishiswa kakhulu.
Isikhathi sokuthumela: Nov-04-2022