Fa'apuupuuga: Le fa'aogaina o totonu ole atunu'uhydroxypropyl methylcellulosenai lo le faaulufale mai se tasi i le gaosiga o le PVC ma le maualuga polymerization tikeri na faailoa mai. O aafiaga o ituaiga e lua o le hydroxypropyl methylcellulose i luga o meatotino o le PVC ma le maualuga polymerization tikeri na suʻesuʻeina. O fa'ai'uga na fa'aalia ai e mafai ona sui le hydroxypropyl methyl cellulose i totonu o le atunu'u mo le fa'aulufale mai.
High-degree-of-polymerization PVC resins e faasino i PVC resins ma se tikeri averesi o polymerization e sili atu i le 1,700 poʻo se faʻapipiʻi laʻititi laʻititi i le va o molelaʻau, lea e sili ona taatele o PVC resins ma se tikeri masani o le polymerization o le 2,500 [1]. Pe a faatusatusa i resin PVC masani, maualuga-polymerization PVC resin e maualuga le maufetuunaʻi, seti compression laiti, tetee vevela lelei, tetee matua, tetee vaivai ma ofuina tetee. O se pa'u lelei e suitulaga i le pa'u ma e mafai ona fa'aoga i fasipepa fa'amaufa'ailoga ta'avale, uaea ma uaea, fa'amama fa'afoma'i, ma isi. [2].
O le gaosiga o le PVC ma le maualuga o le polymerization e masani lava ona faʻamalolo le polymerization [3-4]. I le gaosiga o le auala faʻamalolo, o le dispersant o se sui fesoasoani taua, ma o lona ituaiga ma le aofaʻi o le a aʻafia saʻo ai le foliga o le tino, tufatufaina atu o vaega, ma le faʻaogaina o le plasticizer o le resin PVC maeʻa. O faiga fa'asalalau e masani ona fa'aaogaina o le polyvinyl alcohol systems ma le hydroxypropyl methylcellulose ma le polyvinyl alcohol composite dispersion systems, ma o lo'o fa'aaogaina e le au gaosi oloa i totonu o le atunu'u le mea mulimuli [5].
1 Mea mata'utia ma fa'amatalaga
O mea autu autu ma faʻamatalaga o loʻo faʻaaogaina i le suʻega o loʻo faʻaalia i le Laulau 1. E mafai ona vaʻaia mai le Laulau 1 o le fale o le hydroxypropyl methylcellulose filifilia i lenei pepa e ogatasi ma le hydroxypropyl methylcellulose faʻaulufale mai, lea e maua ai se mea e manaʻomia muamua mo le suʻega suʻega i lenei pepa.
2 Su'ega mataupu
2. 1 Sauniuniga ole vaifofo hydroxypropyl methylcellulose
Ave se vaega o le vai deionized, tuu i totonu o se atigipusa ma vevela i le 70 ° C, ma faasolosolo malie ona faaopoopo le hydroxypropyl methylcellulose i lalo o le faʻaosooso faifaipea. O le cellulose e faʻafefe i luga o le vai i le taimi muamua, ona faʻasolosolo malie lea ona faʻasalalau seia oʻo ina faʻafefiloi. Fa'alili le vaifofo ile voluma.
Fuafuaga 1 Mea mata'ina autu ma o latou fa'amatalaga
| Igoa mea mata'utia | Fa'amatalaga |
| Vinyl chloride monomer | Sikoa lelei≥99. 98% |
| Vai fa'asalaina | Amioga≤10. 0 μs/cm, tau pH 5. 00 i le 9. 00 |
| Polyvinyl alcohol A | Fa'ailoga ole ava malosi 78. 5% i le 81. 5%, mea efuefu≤0. 5%, mea fe'avea'i≤5. 0% |
| Polyvinyl alcohol B | Faailoga ole ava malosi 71. 0% i le 73. 5%, viscosity 4. 5 i le 6. 5mPa s, mea fe'avea'i≤5. 0% |
| Polyvinyl alcohol C | Fa'ailoga ole ava malosi 54. 0% i le 57. 0% , viscosity 800 ~ 1 400mPa s, mea mautu 39（. 5% i le 40. 5% |
| Hydroxypropyl methylcellulose A faaulufale mai | Viscosity 40 ~ 60 mPa s, vaega vaega o le methoxyl 28% ~ 30%, vaega vaega o le hydroxypropyl 7% ~ 12%, susu ≤5. 0% |
| Hydroxypropyl methylcellulose B ile fale | Viscosity 40 ~ 60 mPa s, vaega vaega o le methoxyl 28% ~ 30%, vaega vaega o le hydroxypropyl 7% ~ 12%, susu ≤5. 0% |
| Pis (2-ethylhexyl peroxydicarbonate) | Vaega ninii [ (45 ~ 50) ± 1] % |
2. 2 Su'ega metotia
I luga o se masini su'esu'e la'ititi 10 L, fa'aaoga le hydroxypropyl methyl cellulose o lo'o fa'aulufale mai e fa'atino ai su'ega fa'ata'ita'i e iloa ai le fua fa'atatau o le su'ega la'ititi; fa'aaoga le hydroxypropyl methyl cellulose i totonu o le atunu'u e sui ai le hydroxypropyl methyl cellulose mai fafo mo su'ega; O oloa PVC resin na gaosia e eseese hydroxypropyl methyl cellulose na faʻatusatusa i le suʻesuʻeina o le toe faʻaogaina o le hydroxypropyl methyl cellulose i totonu o aiga. E tusa ai ma taunuʻuga o le suʻega laʻititi, o le suʻega gaosiga o loʻo faia.
2. 3 Laasaga su'ega
A'o le'i faia le tali, fa'amama le ulo polymerization, tapuni le alavai pito i lalo, fa'aopoopo se aofa'i o vai fa'asalaina, ona fa'aopoopo lea o le fa'asalalau; tapuni le tapuni o le ulo, faamama pe a uma ona pasia le suʻega o le mamafa o le nitrogen, ona faʻaopopo lea o le vinyl chloride monomer; pe a uma ona faʻafefeteina malulu, faʻapipiʻi le initiator; Fa'aaogā le vai fe'avea'i e fa'ae'e ai le vevela i totonu o le ulo i le vevela o le tali, ma fa'aopoopo le vaifofo ammonium bicarbonate i se taimi talafeagai i le taimi o lenei fa'agasologa e fetu'una'i ai le tau o le pH o le faiga tali; pe a pa'ū le mamafa o le tali i le mamafa o loʻo faʻamaonia i totonu o le fua faʻatatau, faʻaopoopo se sui faʻamutaina ma se mea faʻafefete, ma faʻamalolo O le oloa maeʻa o le PVC resin na maua mai i le centrifugation ma le faʻamago, ma faʻataʻitaʻiina mo le auiliiliga.
2. 4 auala su'esu'e
E tusa ai ma metotia suʻega talafeagai i tulaga tau pisinisi Q31 / 0116000823C002-2018, o le numera viscosity, foliga vaaia, mea faʻafefe (e aofia ai le vai) ma le faʻaogaina o le 100 g PVC resin o le PVC resin maeʻa na tofotofoina ma auʻiliʻili; Ole fua ole lapopoa ole PVC resin na tofotofoina; o le morphology o le PVC resin particles sa matauina i le faʻaogaina o le microscope electron scanning.
3 I'uga ma Talanoaga
3. 1 Iloiloga faʻatusatusa o le lelei o vaega eseese o le PVC resin i le polymerization laʻititi
Lomi 2. E tusa ai ma le metotia suʻega o loʻo faʻamatalaina i le 4, o vaega taʻitasi o laʻititi laʻititi maeʻa PVC resin na faʻataʻitaʻiina, ma o faʻaiʻuga o loʻo faʻaalia i le Laulau 2.
Siata 2 i'uga o vaega eseese o su'ega laiti
| Vaega | Hydroxypropyl methyl cellulose | Fa'aaliga manino/(g/mL) | Ole lapopo'a ole fasimea/μm | Viscosity/(mL/g) | Plasticizer absorption o le 100 g PVC resin/g | mea fe'avea'i/% |
| 1# | Fa'aulufale mai | 0.36 | 180 | 196 | 42 | 0.16 |
| 2# | Fa'aulufale mai | 0.36 | 175 | 196 | 42 | 0.20 |
| 3# | Fa'aulufale mai | 0.36 | 182 | 195 | 43 | 0.20 |
| 4# | Aiga | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | Aiga | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | Aiga | 0.36 | 167 | 194 | 43 | 0.22 |
E mafai ona vaʻaia mai le Laulau 2: O le faʻaaliga manino, numera viscosity ma le faʻapipiʻiina o le plasticizer o le resini PVC maua e latalata i le faʻaaogaina o cellulose eseese mo suʻega laiti; ole oloa resin maua mai ile fa'aogaina ole hydroxypropyl methylcellulose fa'afale ole fua ole laititi ole laititi ole la'ititi.
Ata 1 o lo'o fa'aalia ai ata SEM o oloa resini PVC na maua mai i le fa'aogaina o le hydroxypropyl methylcellulose eseese.
(1)—O le hydroxypropyl methylcellulose faaulufale mai
(2)—O le hydroxypropyl methylcellulose i totonu o aiga
Fig. 1 SEM o resini gaosia i le 10-L polymerizer i luma o le hydroxypropyl methyl cellulose eseese.
E mafai ona vaʻaia mai le Ata 1 o le fausaga o luga o le PVC resin particles e gaosia e eseese cellulose dispersants e tutusa lelei.
I se aotelega, e mafai ona iloa o le hydroxypropyl methylcellulose i totonu o le atunuu o loʻo faʻataʻitaʻiina i lenei pepa e mafai ona suitulaga i le hydroxypropyl methylcellulose mai fafo.
3. 2 Suʻesuʻega faʻatusatusa o le lelei o le PVC resin ma le maualuga o le polymerization tikeri i le gaosiga o suʻega
Ona o le maualuga o le tau ma le lamatiaga o le gaosiga o suʻega, e le mafai ona faʻaoga saʻo le polokalame sui atoatoa o suʻega laʻititi. O le mea lea, o le polokalame o le faasolosolo malie o le faateleina o le vaega o le hydroxypropyl methylcellulose i totonu o le fale ua faʻaaogaina. O fa'ai'uga o su'ega o vaega ta'itasi o lo'o fa'aalia ile Siata 3. fa'aalia.
Fuafuaga 3 Fa'ai'uga o su'ega o vaega eseese o gaosiga
| Vaega | M (hydroxypropyl methyl cellulose fale):M (hydroxypropyl methyl cellulose faaulufale mai) | Fa'aaliga manino/(g/mL) | Numera viscosity/(mL/g) | Plasticizer absorption o le 100 g PVC resin/g | mea fe'avea'i/% |
| 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 |
E mafai ona iloa mai le Siata 3 o le fa'aogaina o le hydroxypropyl methylcellulose i totonu o le atunu'u na faasolosolo malie lava ona fa'atupula'ia se'ia o'o ina suia uma vaega ole hydroxypropyl methylcellulose i totonu o le atunu'u ole hydroxypropyl methylcellulose mai fafo. O fa'ailoga autu e pei o le palasitika absorption ma le mamafa manino e le'i fesuisuiai tele, e fa'ailoa mai ai o le hydroxypropyl methylcellulose i totonu o le atunu'u ua filifilia i lenei pepa e mafai ona sui ai le hydroxypropyl methylcellulose mai fafo i le gaosiga.
4 Faaiuga
Ole su'ega ole aigahydroxypropyl methyl cellulosei luga o se masini su'esu'e la'ititi 10 L o lo'o fa'aalia ai e mafai ona suitulaga mai i fafo hydroxypropyl methyl cellulose; o fa'ai'uga o su'ega o su'ega o lo'o fa'aalia ai o lo'o fa'aaogaina le hydroxypropyl methyl cellulose ile fale mo le gaosiga o le resini PVC, o fa'ailoga autu o le PVC resin ma le fa'aulufale mai o le hydroxypropyl methyl cellulose e leai se eseesega tele. I le taimi nei, o le tau o le cellulose i totonu o le atunuu e maualalo ifo nai lo le cellulose mai fafo. O le mea lea, afai e faʻaaogaina le cellulose i totonu o le fale i le gaosiga, o le tau o fesoasoani gaosiga e mafai ona faʻaititia tele.
Taimi meli: Apr-25-2024