Isishwankathelo: Ukusetyenziswa kwezixhobo zasekhayai-hydroxypropyl methylcelluloseendaweni yokungenisa enye kwimveliso yePVC enezinga eliphezulu lepolymerization yaziswa. Iziphumo zeentlobo ezimbini zehydroxypropyl methylcellulose kwiipropati zePVC enezinga eliphezulu lepolymerization zaphandwa. Iziphumo zibonise ukuba kunokwenzeka ukutshintsha ihydroxypropyl methyl cellulose yasekhaya endaweni yeyokungenisa.
Ii-resin ze-PVC ezinezinga eliphezulu le-polymerization zibhekisa kwii-resin ze-PVC ezinezinga eliqhelekileyo le-polymerization elingaphezulu kwe-1,700 okanye ezinesakhiwo esidityaniswe kancinci phakathi kwee-molecule, phakathi kwazo ezixhaphakileyo zii-resin ze-PVC ezinezinga eliqhelekileyo le-polymerization eliyi-2,500 [1]. Xa kuthelekiswa ne-resin ye-PVC eqhelekileyo, i-resin ye-PVC ene-polymerization ephezulu inokuqina okuphezulu, iseti encinci yokucinezelwa, ukumelana nobushushu okuhle, ukumelana nokwaluphala, ukumelana nokudinwa kunye nokumelana nokuguguleka. Yindawo efanelekileyo yerabha kwaye ingasetyenziswa kwimigca yokutywina iimoto, iingcingo kunye neentambo, ii-catheters zonyango, njl. [2].
Indlela yokuvelisa i-PVC enezinga eliphezulu le-polymerization ikakhulu yi-suspension polymerization [3-4]. Kwimveliso ye-suspension method, i-dispersant yiarhente encedisayo ebalulekileyo, kwaye uhlobo lwayo kunye nobungakanani bayo buya kuchaphazela ngokuthe ngqo imo ye-particle, ukusasazwa kobungakanani be-particle, kunye nokufunxwa kwe-plasticizer ye-resin ye-PVC egqityiweyo. Iinkqubo zokusasaza ezisetyenziswa kakhulu ziinkqubo ze-polyvinyl alcohol kunye neenkqubo ze-hydroxypropyl methylcellulose kunye ne-polyvinyl alcohol composite dispersion, kwaye abavelisi basekhaya basebenzisa kakhulu le yokugqibela [5].
1 Izinto eziphambili kunye neenkcukacha
Izinto eziphambili kunye neenkcukacha ezisetyenzisiweyo kuvavanyo ziboniswe kwiTheyibhile 1. Kuyabonakala kwiTheyibhile 1 ukuba i-hydroxypropyl methylcellulose yasekhaya ekhethiweyo kweli phepha iyahambelana ne-hydroxypropyl methylcellulose engenisiweyo, ebonelela ngemfuneko yovavanyo lokutshintshwa kweli phepha.
2 Vavanya umxholo
2. 1 Ukulungiswa kwesisombululo se-hydroxypropyl methylcellulose
Thatha umlinganiselo othile wamanzi acocekileyo, uwafake kwisitya uze uwafudumale ukuya kuma-70°C, uze wongeze kancinci i-hydroxypropyl methylcellulose phantsi kokuxutywa rhoqo. I-cellulose iyadada emanzini kuqala, ize isasazeke kancinci ide ixutywe ngokulinganayo. Pholisa isisombululo sibe yivolumu.
Itheyibhile 1 Izinto eziphambili kunye neenkcukacha zazo
| Igama lezinto eziluhlaza | Inkcazo |
| I-monomer ye-vinyl chloride | Amanqaku omgangatho≥99. 98% |
| Amanzi asuswe ityuwa | Ukuqhuba kombane≤10. 0 μs/cm, ixabiso le-pH 5. 00 ukuya kwi-9. 00 |
| Utywala bePolyvinyl A | Iqondo lotywala 78. 5% ukuya kuma-81. 5%, umxholo wothuthu ≤0. 5%, i-volatile matter ≤5. 0% |
| I-Polyvinyl alcohol B | Iqondo lotywala 71. 0% ukuya kwi-73. 5%, i-viscosity 4. 5 ukuya kwi-6. 5mPas, i-volatile matter≤5. 0% |
| I-Polyvinyl alcohol C | Iqondo lotywala 54. 0% ukuya kuma-57. 0%, i-viscosity 800 ~ 1 400mPa, umxholo oqinileyo 39. 5% ukuya kuma-40. 5% |
| I-hydroxypropyl methylcellulose A engenisiweyo | Ukuqina 40 ~ 60 mPa s, iqhezu lobunzima be-methoxyl 28% ~ 30%, iqhezu lobunzima be-hydroxypropyl 7% ~ 12%, ukufuma ≤5. 0% |
| I-hydroxypropyl methylcellulose B yasekhaya | Ukuqina 40 ~ 60 mPa s, iqhezu lobunzima be-methoxyl 28% ~ 30%, iqhezu lobunzima be-hydroxypropyl 7% ~ 12%, ukufuma ≤5. 0% |
| I-Bis (2-ethylhexyl peroxydicarbonate) | Iqhezu lobunzima [(45 ~ 50) ± 1] % |
2. 2 Indlela yovavanyo
Kwisixhobo sovavanyo esincinci se-10 L, sebenzisa i-hydroxypropyl methyl cellulose engenisiweyo ukwenza uvavanyo lokulinganisa ukumisela ifomula esisiseko yovavanyo oluncinci; sebenzisa i-hydroxypropyl methyl cellulose yasekhaya ukuthatha indawo ye-hydroxypropyl methyl cellulose engenisiweyo ukuze kuvavanywe; Iimveliso ze-resin ze-PVC eziveliswe yi-hydroxypropyl methyl cellulose eyahlukeneyo zithelekiswe nophando lokwenzeka kokutshintshwa kwe-hydroxypropyl methyl cellulose yasekhaya. Ngokweziphumo zovavanyo oluncinci, uvavanyo lwemveliso luyenziwa.
2. Amanyathelo ovavanyo ama-3
Ngaphambi kokuba kwenzeke oku, coca iketile yepolymerization, uvale ivalvu esezantsi, wongeze amanzi athile asuswe ityuwa, uze wongeze i-dispersant; vala isiciko seketile, uvacuum emva kokuphumelela uvavanyo loxinzelelo lwe-nitrogen, uze wongeze i-vinyl chloride monomer; emva kokuxubha okubandayo, yongeza i-initiator; Sebenzisa amanzi ajikelezayo ukuphakamisa ubushushu kwiketile ukuya kubushushu bokusabela, uze wongeze isisombululo se-ammonium bicarbonate ngexesha elifanelekileyo ngeli xesha le nkqubo ukuze ulungise ixabiso le-pH yenkqubo yokusabela; xa uxinzelelo lokusabela luhla ukuya kuxinzelelo oluchazwe kwifomyula, yongeza i-arhente yokuphelisa kunye ne-arhente yokukhupha ityuwa, uze ukhuphe imveliso egqityiweyo ye-resin ye-PVC ifunyenwe nge-centrifugation kunye nokomisa, kwaye isampuliwe ukuze ihlalutywe.
2. 4 Iindlela zohlalutyo
Ngokweendlela zovavanyo ezifanelekileyo kwimigangatho yeshishini Q31/0116000823C002-2018, inani le-viscosity, uxinano olubonakalayo, izinto eziguquguqukayo (kuquka amanzi) kunye nokufunxwa kwe-plasticizer ye-100 g ye-PVC resin ye-PVC egqityiweyo zivavanyiwe kwaye zahlalutywa; Ubungakanani obuphakathi bee-particle ze-PVC resin buvavanyiwe; imo yee-particle ze-PVC resin zibonwe kusetyenziswa i-scanning electron microscope.
3 Iziphumo kunye nengxoxo
3. 1 Uhlalutyo oluthelekisayo lomgangatho weebhetshi ezahlukeneyo ze-resin ye-PVC kwi-polymerization encinci
Cinezela 2. Ngokwendlela yovavanyo echazwe kwi-4, ibhetshi nganye ye-resin ye-PVC egqityiweyo encinci ivavanyiwe, kwaye iziphumo ziboniswe kwiTheyibhile 2.
Itheyibhile 2 iziphumo zeebhetshi ezahlukeneyo zovavanyo oluncinci
| Iqela | I-Hydroxypropyl methyl cellulose | Uxinano olubonakalayo/(g/mL) | Ubungakanani obuqhelekileyo besuntswana/μm | Ukuqina/(mL/g) | Ukufunxwa kwe-plasticizer ye-100 g ye-resin ye-PVC/g | Izinto eziguquguqukayo/% |
| 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# | Yasekhaya | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | Yasekhaya | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | Yasekhaya | 0.36 | 167 | 194 | 43 | 0.22 |
Oku kunokubonwa kwiTheyibhile 2: Ubuninzi obubonakalayo, inani le-viscosity kunye nokufunxwa kwe-plasticizer ye-resin ye-PVC efunyenweyo kusondelelene kakhulu ngokusebenzisa i-cellulose eyahlukileyo kuvavanyo oluncinci; imveliso ye-resin efunyenwe ngokusebenzisa ifomula yasekhaya ye-hydroxypropyl methylcellulose Ubungakanani obuqhelekileyo be-particle buncinci kancinci.
Umfanekiso 1 ubonisa imifanekiso ye-SEM yeemveliso ze-resin ze-PVC ezifunyenwe ngokusebenzisa i-hydroxypropyl methylcellulose eyahlukileyo.
(1)—I-hydroxypropyl methylcellulose engenisiweyo
(2)—I-hydroxypropyl methylcellulose yasekhaya
Umfanekiso 1 SEM yeeresini eziveliswa kwi-polymerizer ye-10-L xa kukho i-hydroxypropyl methyl cellulose eyahlukileyo
Kuyabonakala kuMfanekiso 1 ukuba izakhiwo zomphezulu wee-PVC resin particles eziveliswa zii-cellulose dispersants ezahlukeneyo ziyafana kakhulu.
Ukushwankathela, kunokubonwa ukuba i-hydroxypropyl methylcellulose yasekhaya evavanyiweyo kweli phepha inako ukutshintsha i-hydroxypropyl methylcellulose engenisiweyo.
3. 2 Uhlalutyo oluthelekisayo lomgangatho we-resin ye-PVC enezinga eliphezulu le-polymerization kuvavanyo lwemveliso
Ngenxa yeendleko eziphezulu kunye nomngcipheko wovavanyo lwemveliso, inkqubo epheleleyo yokutshintsha uvavanyo oluncinci ayinakusetyenziswa ngokuthe ngqo. Ke ngoko, inkqubo yokunyusa kancinci umlinganiselo we-hydroxypropyl methylcellulose yasekhaya kwifomyula iyamkelwa. Iziphumo zovavanyo lwebhetshi nganye ziboniswe kwiTheyibhile 3.
Itheyibhile 3 Iziphumo zovavanyo lweebhetshi ezahlukeneyo zemveliso
| Iqela | I-M (i-hydroxypropyl methyl cellulose yasekhaya): I-M (i-hydroxypropyl methyl cellulose engeniswe kwamanye amazwe) | Uxinano olubonakalayo/(g/mL) | Inombolo ye-viscosity/(mL/g) | Ukufunxwa kwe-plasticizer ye-100 g ye-resin ye-PVC/g | Izinto eziguquguqukayo/% |
| 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 |
Kuyabonakala kwiTheyibhile 3 ukuba ukusetyenziswa kwe-hydroxypropyl methylcellulose yasekhaya kwandiswe kancinci kancinci de zonke iibhetshi ze-hydroxypropyl methylcellulose yasekhaya zathatha indawo ye-hydroxypropyl methylcellulose engenisiweyo. Izalathisi eziphambili ezifana nokufunxwa kweplastiki kunye noxinano olubonakalayo azizange zitshintshe kakhulu, nto leyo ebonisa ukuba i-hydroxypropyl methylcellulose yasekhaya ekhethiweyo kweli phepha inokuthatha indawo ye-hydroxypropyl methylcellulose engenisiweyo kwimveliso.
4 Isiphelo
Uvavanyo lwasekhayai-hydroxypropyl methyl celluloseKwisixhobo sovavanyo esincinci se-10 L sibonisa ukuba sinokukwazi ukutshintsha i-hydroxypropyl methyl cellulose engenisiweyo; iziphumo zovavanyo lokutshintshwa kwemveliso zibonisa ukuba i-hydroxypropyl methyl cellulose yasekhaya isetyenziselwa ukuvelisa i-resin ye-PVC, izalathisi eziphambili zomgangatho we-resin ye-PVC egqityiweyo kunye ne-hydroxypropyl methyl cellulose engenisiweyo azinamahluko abalulekileyo. Okwangoku, ixabiso le-cellulose yasekhaya kwimarike liphantsi kunele-cellulose engenisiweyo. Ke ngoko, ukuba i-cellulose yasekhaya isetyenziswa kwimveliso, iindleko zemveliso zinokuncitshiswa kakhulu.
Ixesha leposi: Epreli-25-2024