Soo Koobid: Adeegsiga guryahahydroxypropyl methylcelluloseHalkii laga soo dhoofin lahaa mid la soo saarayo si loo soo saaro PVC oo leh heer sare oo polymerization ah ayaa la soo bandhigay. Saamaynta laba nooc oo hydroxypropyl methylcellulose ah ay ku leeyihiin sifooyinka PVC ee leh heer sare oo polymerization ah ayaa la baaray. Natiijooyinka waxay muujiyeen inay suurtogal tahay in lagu beddelo hydroxypropyl methyl cellulose gudaha mid la soo dhoofiyay.
Resinada PVC ee heerka sare ah ee polymerization waxay tilmaamayaan resinada PVC oo leh heer celcelis ahaan polymerization oo ka badan 1,700 ama qaab-dhismeed isku xiran oo u dhexeeya molecules, kuwaas oo ay ugu badan yihiin resinada PVC oo leh heer celcelis ahaan polymerization oo ah 2,500 [1]. Marka la barbardhigo resinka PVC ee caadiga ah, resinka PVC ee polymerization-ka sareeya wuxuu leeyahay adkeysi sare, qalab yar oo cadaadis ah, iska caabin kulayl oo wanaagsan, iska caabin gabowga, iska caabin daal iyo iska caabin xirasho. Waa beddel caag ah oo ku habboon waxaana loo isticmaali karaa xargaha shaabadaynta baabuurta, fiilooyinka iyo fiilooyinka, kateetarka caafimaadka, iwm. [2].
Habka wax soo saarka ee PVC oo leh heer sare oo polymerization ah ayaa inta badan ah polymerization-ka suspension [3-4]. Soo saarista habka joojinta, kala firdhiyuhu waa wakiil muhiim ah oo kaaliye ah, noociisa iyo qaddarkiisuna si toos ah ayay u saameyn doonaan qaabka walxaha, qaybinta cabbirka walxaha, iyo nuugista balaastikada ee resin-ka PVC ee la dhammeeyey. Nidaamyada kala firdhinta ee caadiga ah ee la isticmaalo waa nidaamyada khamriga polyvinyl iyo nidaamyada kala firdhinta hydroxypropyl methylcellulose iyo polyvinyl alcohol composite, soosaarayaasha gudahana waxay inta badan isticmaalaan kan dambe [5].
1 Alaabada ugu muhiimsan ee ceeriin iyo qeexitaannada
Alaabada ceeriin ee ugu muhiimsan iyo qeexitaannada loo isticmaalay tijaabada waxaa lagu muujiyay Shaxda 1. Waxaa laga arki karaa Shaxda 1 in hydroxypropyl methylcellulose-ka gudaha ee lagu xushay warqaddan uu la jaan qaadayo hydroxypropyl methylcellulose-ka la soo dhoofiyay, kaas oo bixiya shuruudo loogu talagalay tijaabada beddelka ah ee warqaddan ku jirta.
2 Tijaabo waxa ku jira
2. 1 Diyaarinta xalka hydroxypropyl methylcellulose
Qaado xaddi gaar ah oo biyo ah oo la baabi'iyay, ku rid weel oo ku kululee ilaa 70°C, oo si tartiib tartiib ah ugu dar hydroxypropyl methylcellulose adigoo si joogto ah u walaaqaya. Cellulose-ku wuxuu marka hore dul sabaynayaa biyaha, ka dibna si tartiib tartiib ah ayuu u kala firdhiyaa ilaa uu si siman isugu qasmo. Qabooji xalka ilaa mugga.
Shaxda 1 Alaabada ceeriin ee ugu muhiimsan iyo qeexitaankooda
| Magaca walxaha ceeriin | Faahfaahinta |
| Monomer-ka vinyl chloride | Dhibcaha tayada ≥99. 98% |
| Biyo la nadiifiyey | Qaboojinta ≤10. 0 μs/cm, qiimaha pH 5. 00 ilaa 9. 00 |
| Khamriga Polyvinyl A | Heerka aalkolada 78． 5% ilaa 81． 5%, dambaska ku jira ≤0. 5%, walax isbeddelaysa ≤5. 0% |
| Khamriga Polyvinyl B | Heerka aalkolada 71. 0% ilaa 73. 5%, isku-dhafnaan 4. 5 ilaa 6. 5mPas, walax isbeddelaysa ≤5. 0% |
| Khamriga Polyvinyl C | Heerka aalkolada 54. 0% ilaa 57. 0%, isku-dhafnaan 800 ~ 1 400mPas, maaddada adag 39. 5% ilaa 40. 5% |
| Hydroxypropyl methylcellulose A ee laga soo dhoofiyay dibadda | Viscosity 40 ~ 60 mPa s, jajabka cufka methoxyl 28% ~ 30%, jajabka cufka hydroxypropyl 7% ~ 12%, qoyaan ≤5.0% |
| Hydroxypropyl methylcellulose B ee guriga | Viscosity 40 ~ 60 mPa s, jajabka cufka methoxyl 28% ~ 30%, jajabka cufka hydroxypropyl 7% ~ 12%, qoyaan ≤5.0% |
| Bis (2-ethylhexyl peroxydicarbonate) | Jajabka cufnaanta [ (45 ~ 50) ± 1] % |
2. 2 Habka tijaabada
Qalabka tijaabada yar ee 10 L ah, isticmaal hydroxypropyl methyl cellulose oo la soo dhoofiyay si aad u sameyso tijaabooyin tijaabo ah si aad u go'aamiso qaacidada aasaasiga ah ee tijaabada yar; isticmaal hydroxypropyl methyl cellulose gudaha ah si aad u beddesho hydroxypropyl methyl cellulose dibadda ah si aad u tijaabiso; Badeecadaha resin-ka PVC ee ay soo saaraan hydroxypropyl methyl cellulose kala duwan ayaa la barbar dhigay si loo barto suurtagalnimada beddelka hydroxypropyl methyl cellulose gudaha ah. Sida laga soo xigtay natiijooyinka tijaabada yar, tijaabada wax soo saarka ayaa la sameeyaa.
2. 3 Tallaabooyin tijaabo ah
Kahor falcelinta, nadiifi kildiga polymerization-ka, xidh waalka hoose, ku dar xaddi gaar ah oo biyo milix leh, ka dibna ku dar kala firdhiyaha; xidh daboolka kildiga, faakiyuum ka dib markaad ka gudubto tijaabada cadaadiska nitrogen, ka dibna ku dar monomer vinyl chloride; ka dib markaad qabow walaaqdo, ku dar bilaabaha; Isticmaal biyo wareegaya si aad heerkulka kildiga ugu kordhiso heerkulka falcelinta, oo ku dar xalka ammonium bicarbonate si waqtigeeda ah inta lagu jiro hawshan si aad u hagaajiso qiimaha pH ee nidaamka falcelinta; marka cadaadiska falcelintu hoos ugu dhaco cadaadiska lagu qeexay qaacidada, ku dar wakiil joojinaya iyo wakiil defoaming ah, oo sii daaya. Wax soo saarka dhammaystiran ee resin PVC waxaa lagu helay centrifugation iyo qalajin, waxaana laga qaaday muunad si loo falanqeeyo.
2. 4 Hababka Falanqaynta
Sida ku xusan hababka tijaabada ee khuseeya heerka ganacsiga Q31/0116000823C002-2018, tirada viscosity-ga, cufnaanta muuqata, walaxda kacsan (oo ay ku jiraan biyaha) iyo nuugista balaastikada ee 100 g oo ah resin PVC ah oo ka mid ah resin PVC ee la dhammeeyey ayaa la tijaabiyey oo la falanqeeyay; Celceliska cabbirka walxaha resin PVC ayaa la tijaabiyey; qaab-dhismeedka walxaha resin PVC waxaa lagu arkay iyadoo la adeegsanayo mikroskoob elektaroonik ah oo sawiraya.
3 Natiijo iyo Dood
3. 1 Falanqayn isbarbardhig ah oo ku saabsan tayada dufcadaha kala duwan ee resin PVC ee polymerization-ka yar yar
Riix 2. Sida ku cad habka tijaabada ee lagu sharraxay 4, dufcad kasta oo ah resin PVC ah oo yar oo la dhammeeyey ayaa la tijaabiyey, natiijooyinkana waxaa lagu muujiyey Shaxda 2.
Shaxda 2 natiijooyinka dufcado kala duwan oo tijaabo yar ah
| Dufcad | Cellulose Hydroxypropyl methyl | Cufnaanta muuqata/(g/mL) | Celceliska cabbirka walxaha/μm | Viscosity/(mL/g) | Nuugista balaastikada ee 100 g oo ah resin PVC/g | Walax isbeddelaya/% |
| 1# | Soo dejinta | 0.36 | 180 | 196 | 42 | 0.16 |
| 2# | Soo dejinta | 0.36 | 175 | 196 | 42 | 0.20 |
| 3# | Soo dejinta | 0.36 | 182 | 195 | 43 | 0.20 |
| 4# | Gudaha | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | Gudaha | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | Gudaha | 0.36 | 167 | 194 | 43 | 0.22 |
Waxaa laga arki karaa Shaxda 2aad: Cufnaanta muuqata, tirada viscosity-ga iyo nuugista balaastikada ee resin-ka PVC ee la helay waa isku dhow yihiin iyadoo la isticmaalayo cellulose kala duwan si loo sameeyo baaritaan yar; badeecada resin-ka ee laga helo iyadoo la adeegsanayo qaacidada hydroxypropyl methylcellulose ee gudaha. Cabbirka walxaha celceliska ah ayaa xoogaa ka yar.
Jaantuska 1aad wuxuu muujinayaa sawirrada SEM ee alaabada resin-ka PVC ee laga helay isticmaalka hydroxypropyl methylcellulose kala duwan.
(1)—Hydroxypropyl methylcellulose oo laga soo dhoofiyay dibadda
(2)—Hydroxypropyl methylcellulose oo gudaha ku jira
Jaantuska 1aad ee resins-ka ee lagu soo saaray polymerizer 10-L iyadoo ay joogaan cellulose hydroxypropyl methyl oo kala duwan
Waxaa laga arki karaa Jaantuska 1aad in qaab-dhismeedka dusha sare ee walxaha resin-ka PVC ee ay soo saaraan kala-firdhiyeyaasha cellulose-ka ee kala duwan ay isku mid yihiin.
Marka la soo koobo, waxaa la arki karaa in hydroxypropyl methylcellulose-ka gudaha ee lagu tijaabiyay warqaddan uu leeyahay suurtagalnimada beddelka hydroxypropyl methylcellulose-ka la soo dhoofiyay.
3. 2 Falanqayn isbarbardhig ah oo ku saabsan tayada resin-ka PVC oo leh shahaado polymerization sare ah oo ku saabsan tijaabada wax soo saarka
Sababtoo ah kharashka sare iyo khatarta baaritaanka wax soo saarka, nidaamka beddelka dhammaystiran ee tijaabada yar si toos ah looma isticmaali karo. Sidaa darteed, qorshaha ah in si tartiib tartiib ah loo kordhiyo saamiga hydroxypropyl methylcellulose ee gudaha qaacidada ayaa la qaataa. Natiijooyinka baaritaanka ee dufcad kasta waxaa lagu muujiyay Shaxda 3. ee la muujiyay.
Shaxda 3 Natiijooyinka tijaabada ee dufcadaha wax soo saarka ee kala duwan
| Dufcad | M (cellulose hydroxypropyl methyl gudaha): M (cellulose hydroxypropyl methyl oo la soo dhoofiyay) | Cufnaanta muuqata/(g/mL) | Lambarka is-miisaamida/(mL/g) | Nuugista balaastikada ee 100 g oo ah resin PVC/g | Walax isbeddelaya/% |
| 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 |
Waxaa laga arki karaa Shaxda 3aad in isticmaalka hydroxypropyl methylcellulose-ka gudaha si tartiib tartiib ah loo kordhiyay ilaa dhammaan dufcadaha hydroxypropyl methylcellulose-ka gudaha ay beddelaan hydroxypropyl methylcellulose-ka dibadda laga keeno. Tilmaamayaasha ugu muhiimsan sida nuugista balaastikada iyo cufnaanta muuqata si weyn uma isbeddelin, taasoo muujinaysa in hydroxypropyl methylcellulose-ka gudaha ee lagu xushay warqaddan uu beddeli karo hydroxypropyl methylcellulose-ka dibadda laga keeno ee wax soo saarka.
4 Gunaanad
Imtixaanka gudahacellulose hydroxypropyl methylQalabka tijaabada yar ee 10 L ah wuxuu muujinayaa inuu leeyahay suurtogalnimada lagu beddeli karo hydroxypropyl methyl cellulose-ka la soo dhoofiyay; natiijooyinka baaritaanka beddelka wax soo saarka waxay muujinayaan in hydroxypropyl methyl cellulose-ka gudaha loo isticmaalo soo saarista PVC resin, tilmaamayaasha tayada ugu weyn ee resin PVC ee la dhammeeyay iyo hydroxypropyl methyl cellulose-ka la soo dhoofiyay ma laha farqi weyn. Waqtigan xaadirka ah, qiimaha cellulose-ka gudaha ee suuqa ayaa ka hooseeya kan cellulose-ka la soo dhoofiyay. Sidaa darteed, haddii cellulose-ka gudaha loo isticmaalo wax soo saarka, qiimaha qalabka wax soo saarka si weyn ayaa loo dhimi karaa.
Waqtiga boostada: Abriil-25-2024