Pfupiso: Kushandiswa kwemishonga yemumbahydroxypropyl methylcellulosepachinzvimbo chekuunza imwe kuti igadzire PVC ine dhigirii repamusoro repolymerization yakaunzwa. Mhedzisiro yemhando mbiri dzehydroxypropyl methylcellulose pahunhu hwePVC ine dhigirii repamusoro repolymerization yakaongororwa. Zvakabuda zvakaratidza kuti zvaikwanisika kutsiva hydroxypropyl methyl cellulose yemuno pane imwe inotengeswa kunze kwenyika.
Maresin ePVC ane mwero wepamusoro anoreva maresin ePVC ane mwero wepakati wepolymerization unopfuura 1,700 kana ane chimiro chakabatana zvishoma pakati pemamorekuru, pakati pawo anonyanya kuzivikanwa maresin ePVC ane mwero wepakati wepolymerization we2,500 [1]. Kana tichienzanisa neresin yakajairika yePVC, resin yePVC ine mwero wepolymerization ine simba guru, diki diki, yakasimba kupisa, yakasimba kukwegura, yakasimba kuneta uye yakasimba kupfekwa. Ndiyo inotsiva rabha yakakodzera uye inogona kushandiswa muzvisungo zvekuvhara mota, waya netambo, macatheter ekurapa, nezvimwewo. [2].
Nzira yekugadzira PVC ine mwero wepamusoro wepolymerization inonyanya kushandiswa suspension polymerization [3-4]. Mukugadzira nzira yekumisikidza, dispersant chinhu chakakosha chinobatsira, uye mhando yayo nehuwandu hwayo zvinokanganisa zvakananga chimiro che particle, kugoverwa kwe particle size, uye plasticizer absorption yePVC resin yakapedzwa. Masisitimu ekuparadzira anoshandiswa zvakanyanya ipolyvinyl alcohol systems uye hydroxypropyl methylcellulose uye polyvinyl alcohol composite dispersion systems, uye vagadziri vemumba vanonyanya kushandisa yekupedzisira [5].
1 Zvinhu zvikuru uye zvakatsanangurwa
Zvinhu zvikuru zvakashandiswa mubvunzo uye zvirevo zvakashandiswa mubvunzo zvinoratidzwa muTafura 1. Zvinogona kuonekwa kubva muTafura 1 kuti hydroxypropyl methylcellulose yemumba yakasarudzwa mupepa rino inoenderana nehydroxypropyl methylcellulose inounzwa kunze kwenyika, iyo inopa chinodiwa kuti bvunzo yekutsiva ive mupepa rino.
2 Edza zvemukati
2. 1 Kugadzirira kwe hydroxypropyl methylcellulose solution
Tora mvura yakacheneswa, uiise mumudziyo woipisa kusvika 70°C, wobva wawedzera zvishoma nezvishoma hydroxypropyl methylcellulose uchikurunga nguva dzose. Cellulose inoyangarara pamusoro pemvura pakutanga, yozopararira zvishoma nezvishoma kusvika yasanganiswa zvakaenzana. Tonhodza mushonga kusvika wava vhoriyamu.
Tafura 1 Zvinhu zvikuru uye zvirevo zvavo
| Zita rezvinhu zvisina kugadzirwa | Tsanangudzo |
| Monomer yevinyl chloride | Chibodzwa chemhando yepamusoro≥99. 98% |
| Mvura isina munyu | Kufambisa kwemhepo≤10. 0 μs/cm, pH kukosha 5. 00 kusvika 9. 00 |
| Doro rePolyvinyl A | Dhigirii reAlcoholization 78. 5% kusvika 81. 5%, huwandu hwedota ≤0. 5%, zvinhu zvinoshanduka ≤5. 0% |
| Doro rePolyvinyl B | Dhigirii reAlcohollysis 71. 0% kusvika 73. 5%, viscosity 4. 5 kusvika 6. 5mPa s, volatile matter ≤ 5. 0% |
| Doro rePolyvinyl C | Dhigirii reAlcoholization 54. 0% kusvika 57. 0%, viscosity 800 ~ 1 400mPa s, zviri mukati makasimba 39. 5% kusvika 40. 5% |
| Hydroxypropyl methylcellulose A inotorwa kunze kwenyika | Viscosity 40 ~ 60 mPa s, methoxyl mass fraction 28% ~ 30%, hydroxypropyl mass fraction 7% ~ 12%, hunyoro ≤5. 0% |
| Hydroxypropyl methylcellulose B yemumba | Viscosity 40 ~ 60 mPa s, methoxyl mass fraction 28% ~ 30%, hydroxypropyl mass fraction 7% ~ 12%, hunyoro ≤5. 0% |
| Bis (2-ethylhexyl peroxydicarbonate) | Chikamu chehuremu [(45 ~ 50) ± 1] % |
2. 2 Nzira yekuedza
Pamudziyo wekuyedza mudiki we10 L, shandisa hydroxypropyl methyl cellulose yakabva kunze kwenyika kuti uite bvunzo dzekuenzanisa kuti uone fomura yekutanga yebvunzo diki; shandisa hydroxypropyl methyl cellulose yemumba kutsiva hydroxypropyl methyl cellulose yakabva kunze kwenyika kuti uedze; Zvigadzirwa zvePVC resin zvakagadzirwa nehydroxypropyl methyl cellulose yakasiyana zvakaenzaniswa nekudzidza kugona kwekutsiva hydroxypropyl methyl cellulose yemumba. Zvichienderana nemhedzisiro yebvunzo diki, bvunzo yekugadzira inoitwa.
2. Matanho matatu ekuyedza
Usati watanga kuita reaction, chenesa kettle yepolymerization, vhara vharuvhu yepasi, wedzera huwandu hwakati hwemvura yakabviswa munyu, wobva wawedzera dispersant; vhara chivharo chekettle, bvisa vacuum mushure mekupasa nitrogen pressure test, wobva wawedzera vinyl chloride monomer; mushure mekukurunga nechando, wedzera chinotanga; Shandisa mvura inotenderera kukwidza tembiricha mukettle kusvika patembiricha reaction, uye wedzera ammonium bicarbonate solution nenguva panguva iyi yekugadzirisa pH value ye reaction system; kana reaction pressure yaderera kusvika papressure yakatarwa muformula, wedzera chinogumisa uye chinobvisa defoaming agent, wobva waburitsa. Chigadzirwa chakapedzwa chePVC resin chakawanikwa ne centrifugation nekuomesa, uye chakatorwa kuti chiongororwe.
2. 4 Nzira dzekuongorora
Zvichienderana nenzira dzekuedza dzakakodzera mu standard yebhizinesi Q31/0116000823C002-2018, nhamba ye viscosity, apparent density, volatile matter (kusanganisira mvura) uye plasticizer absorption ye 100 g PVC resin yePVC resin yakapedzwa zvakaedzwa uye zvakaongororwa; Avhareji yehukuru hwe particle resin yePVC yakaedzwa; chimiro che particles yePVC resin chakacherechedzwa uchishandisa scanning electron microscope.
3 Mhedzisiro neKukurukurirana
3. 1 Kuenzanisa mhando yemhando dzakasiyana dzePVC resin mu polymerization diki
Dzvanya 2. Zvichienderana nenzira yekuyedza yakatsanangurwa mu4, batch yega yega yePVC resin yakapedzwa yakaedzwa, uye mhedzisiro yacho inoratidzwa muTafura 2.
Tafura 2 mhedzisiro yemapoka akasiyana ebvunzo diki
| Batch | Hydroxypropyl methyl cellulose | Kuwanda kuri pachena/(g/mL) | Avhareji yehukuru hwezvimedu/μm | Kusviba/(mL/g) | Kunyudzwa kwepurasitiki kwe100 g yePVC resin/g | Zvinhu zvinoshanduka/% |
| 1# | Tumira kunze | 0.36 | 180 | 196 | 42 | 0.16 |
| 2# | Tumira kunze | 0.36 | 175 | 196 | 42 | 0.20 |
| 3# | Tumira kunze | 0.36 | 182 | 195 | 43 | 0.20 |
| 4# | Zvepamba | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | Zvepamba | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | Zvepamba | 0.36 | 167 | 194 | 43 | 0.22 |
Zvinogona kuonekwa kubva paTafura 2: Kuwanda kuri pachena, huwandu hwe viscosity uye kunyudzwa kwe plasticizer kwe resin yePVC yakawanikwa zviri pedyo nekushandisa cellulose yakasiyana pakuedza kudiki; resin chigadzirwa chinowanikwa nekushandisa fomura yehydroxypropyl methylcellulose yemumba. Avhareji yehukuru hwezvimedu idiki zvishoma.
Mufananidzo 1 unoratidza mifananidzo yeSEM yezvigadzirwa zvePVC resin zvakawanikwa nekushandisa hydroxypropyl methylcellulose yakasiyana.
(1)—Hydroxypropyl methylcellulose inotorwa kunze kwenyika
(2)—Hydroxypropyl methylcellulose yemumba
Mufananidzo 1 SEM yemaresini anogadzirwa mu 10-L polymerizer pamberi pe hydroxypropyl methyl cellulose yakasiyana
Zvinogona kuonekwa kubva paMufananidzo 1 kuti maumbirwo epamusoro ePVC resin particles anogadzirwa ne cellulose dispersants akasiyana akafanana.
Muchidimbu, zvinoonekwa kuti hydroxypropyl methylcellulose yemuno yakaedzwa mupepa rino ine mukana wekutsiva hydroxypropyl methylcellulose inotorwa kubva kunze kwenyika.
3. 2 Kuenzanisa mhando yePVC resin ine dhigirii repamusoro repolymerization mukuyedzwa kwekugadzira
Nekuda kwekudhura kwakanyanya uye njodzi yekuyedzwa kwekugadzira, chirongwa chose chekutsiva bvunzo diki hachigone kushandiswa zvakananga. Nokudaro, chirongwa chekuwedzera zvishoma nezvishoma huwandu hwehydroxypropyl methylcellulose yemumba mufomura chagamuchirwa. Mhedzisiro yekuyedzwa kwebhechi rega rega inoratidzwa muTafura 3. inoratidzwa.
Tafura 3 Mhedzisiro yemiedzo yezvikamu zvakasiyana zvekugadzirwa
| Batch | M (hydroxypropyl methyl cellulose yemumba):M (hydroxypropyl methyl cellulose inounzwa kunze kwenyika) | Kuwanda kuri pachena/(g/mL) | Nhamba yekusvina/(mL/g) | Kunyudzwa kwepurasitiki kwe100 g yePVC resin/g | Zvinhu zvinoshanduka/% |
| 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 |
Zvinogona kuonekwa kubva paTafura 3 kuti kushandiswa kwehydroxypropyl methylcellulose yemumba kwakawedzera zvishoma nezvishoma kusvika mabhechi ese ehydroxypropyl methylcellulose yemumba atsiva hydroxypropyl methylcellulose yemumba. Zviratidzo zvikuru zvakaita sekunyudzwa kwepurasitiki uye density iri pachena hazvina kuchinja zvakanyanya, zvichiratidza kuti hydroxypropyl methylcellulose yemumba yakasarudzwa mupepa rino inogona kutsiva hydroxypropyl methylcellulose yemumba iri kugadzirwa.
4 Mhedziso
Muedzo wezvemumbahydroxypropyl methyl cellulosePamudziyo mudiki wekuyedza we10 L unoratidza kuti une mukana wekutsiva hydroxypropyl methyl cellulose inotorwa kubva kunze kwenyika; mhedzisiro yebvunzo yekutsiva kugadzirwa inoratidza kuti hydroxypropyl methyl cellulose inotorwa kubva kunze kwenyika inoshandiswa pakugadzira resin yePVC, zviratidzo zvikuru zvemhando yepamusoro yePVC resin yakapedzwa uye hydroxypropyl methyl cellulose inotorwa kubva kunze kwenyika hazvina musiyano wakakosha. Parizvino, mutengo wecellulose inotorwa kubva kunze kwenyika mumusika wakaderera pane wecellulose inotorwa kubva kunze kwenyika. Saka, kana cellulose inotorwa kubva kunze kwenyika ikashandiswa mukugadzira, mutengo wekugadzira unogona kuderedzwa zvakanyanya.
Nguva yekutumira: Kubvumbi-25-2024