Kupu matua: hydroxypropyl methyl cellulose;PVC me te tohu polymerization teitei;whakamatautau iti;polymerization;roherohenga.
Ko te tono a Haina hydroxypropyl methylcelluloseengari i kawemai tetahi ki te hanga PVC me te tohu polymerization teitei i whakauruhia.I tirotirohia nga paanga o nga momo hydroxypropyl methylcellulose e rua ki nga ahuatanga o te PVC me te tohu polymerization teitei.I kitea e nga hua ka taea te whakakapi i te hydroxypropyl methyl cellulose ki te kawemai.
Ko nga kapia PVC tohu-nui-te-nui e tohu ana ki nga kapia PVC me te tohu toharite o te polymerization neke atu i te 1,700, he hanganga hono paku i waenga i nga ngota ngota.Ka whakatauritea ki te kapia PVC noa, he nui te kaha o te kapia PVC polymerization, he huinga iti, he pai te wera o te wera, he pakeke te pakeke, he ngoikore te ngenge me te kakahu.He whakakapinga rapa pai ka taea te whakamahi ki nga taarai hiri motika, waea me te taura, ngongo rongoa, aha atu.
Ko te tikanga whakaputa o te PVC me te nui o te polymerization ko te nuinga o te polymerization whakatārewatanga.I roto i te hanga o te tikanga whakatārewatanga, ko te dispersant he kaihoko awhina nui, me tona momo me te nui ka pa tika ki te ahua matūriki, te tohatoha rahi matūriki, me te whakauru plasticizer o te kapia PVC kua oti.Ko nga punaha marara e whakamahia nuitia ana ko nga punaha waipiro polyvinyl me te hydroxypropyl methylcellulose me te polyvinyl alcohol composite dispersion system, a ko te nuinga o nga kaihanga o roto e whakamahi ana i enei.
1 Nga rauemi mata matua me nga whakaritenga
Ko nga rawa matua me nga tohu e whakamahia ana i roto i te whakamatautau e whakaatuhia ana i te Ripanga 1. Ka kitea mai i te Ripanga 1 ko te hydroxypropyl methylcellulose whare kua tohua i roto i tenei pepa e rite ana ki te hydroxypropyl methylcellulose kawemai, e whakarato ana i te whakaritenga mo te whakamatautau whakakapi i tenei. pepa.
2 Whakamatau ihirangi
2. 1 Te whakarite wairewa hydroxypropyl methylcellulose
Ka mau ki te wai kaoona, ka maka ki roto i te ipu ka whakamahana ki te 70°C, ka taapirihia te hydroxypropyl methylcellulose i raro i te whakaoho tonu.Ka rewa te cellulose ki runga i te wai i te tuatahi, katahi ka marara haere kia uru noa.Whakamaohia te otinga ki te rōrahi.
Ripanga 1 Ko nga rawa matua me o raatau whakaritenga
| Ingoa rawa | Whakatakotoranga |
| Vinyl chloride monomer | Kounga kounga≥99.98% |
| Te wai whakaheke | Conductivity≤10.0 μs/cm, uara pH 5. 00 ki te 9. 00 |
| Te waipiro polyvinyl A | Tohu waipiro 78.5% ki te 81.5%, ihirangi pungarehu≤0.5%, mea hūpekepeke≤5.0% |
| Te waipiro polyvinyl B | Tohu waipiro 71.0% ki te 73.5%, te pokey 4. 5 ki te 6. 5mPa s, mea pähekeheke≤5.0% |
| Te waipiro polyvinyl C | Tohu waipiro 54.0% ki te 57.0% , pokey 800 ~ 1 400mPa s, ihirangi totoka 39．5% ki te 40. 5% |
| Hydroxypropyl methylcellulose A kawemai | Viscosity 40 ~ 60 mPa s, hautanga papatipu methoxyl 28% ~ 30%, hautanga papatipu hydroxypropyl 7% ~ 12%, makuku≤5.0% |
| Hydroxypropyl methylcellulose B o te kainga | Viscosity 40 ~ 60 mPa · s, hautanga papatipu methoxyl 28% ~ 30%, hautanga papatipu hydroxypropyl 7% ~ 12%, makuku ≤5.0% |
| Bis(2-ethyl peroxydicarbonate) hākawa hexyl) | Hautau papatipu [( 45 ~ 50) ± 1]% |
2. 2 Tikanga whakamatautau
I runga i te taputapu whakamatautau iti 10 L, whakamahia te hydroxypropyl methylcellulose kawemai ki te whakahaere i nga whakamatautau tohu hei whakatau i te tauira taketake o te whakamatautau iti;whakamahi hydroxypropyl methylcellulose kāinga ki te whakakapi hydroxypropyl methylcellulose kawemai mo te whakamatautau;Ko nga hua kapia PVC i hangaia e te hydroxypropyl methylcellulose i whakatairitehia, me te kaha ki te whakakapi i te hydroxypropyl methylcellulose whare i akohia.E ai ki nga hua o te whakamatautau iti, ka whakahaerehia te whakamatautau whakaputa.
2. 3 Nga mahi whakamatautau
I mua i te tauhohenga, horoia te ketere polymerization, kati te pihanga o raro, taapirihia te nui o te wai whakaheke, katahi ka tapirihia te dispersant;katia te uhi ipu wai, whakawetohia i muri i te paahitanga o te whakamatautau hauota, katahi ka tapirihia te monomer vinyl chloride;i muri i te whakaoho makariri, tāpirihia te kaikōkiri;Whakamahia te wai tohanga hei whakanui ake i te pāmahana i roto i te ketere ki te pāmahana tauhohenga, me te taapiri i te wairewa haukinia bicarbonate i te wa tika i roto i tenei mahi ki te whakatika i te uara pH o te punaha tauhohenga;ka heke iho te pehanga tauhohenga ki te pehanga kua tohua i roto i te tauira, taapirihia he kaitapa me te whakapouri, ka tuku i te otinga.Ko te hua oti o te PVC resin i riro mai i te centrifugation me te whakamaroke, me te tauira mo te tātari.
2. 4 Nga tikanga tātari
E ai ki nga tikanga whakamatautau e tika ana i roto i te paerewa hinonga, ko te tau viscosity, te ahua o te kiato, te mea wariu (tae atu ki te wai) me te whakaurunga o te 100 g PVC kapia o te kapia PVC kua oti te whakamatautau me te tātari;Ko te rahi o te matūriki toharite o te PVC resin i whakamatauria;i kitea te ahua o nga matūriki kapia PVC ma te whakamahi i te karu irahiko matawai.
3 Nga Hua me te Matapaki
3. 1 Te tātari whakatairite o te kounga o nga huinga rereke o te PVC resin i roto i te polymerization iti
Perehi 2. E ai ki te tikanga whakamatautau i whakaahuatia i te 4, i whakamatauria ia puranga o te kapia PVC kua oti te tauine iti, a ka whakaatuhia nga hua ki te Ripanga 2.
Ripanga 2 nga hua o nga roopu rereke o te whakamatautau iti
| Puranga | Hydroxypropyl methylcellulose | Kiato ahua/(g/mL) | Rahi matūriki toharite/μm | Viscosity/(mL/g) | Plasticizer absorption o 100 g PVC resin/g | Mahinga karekau/% |
| 1# | Kawemai | 0.36 | 180 | 196 | 42 | 0.16 |
| 2# | Kawemai | 0.36 | 175 | 196 | 42 | 0.20 |
| 3# | Kawemai | 0.36 | 182 | 195 | 43 | 0.20 |
| 4# | I roto i te kainga | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | I roto i te kainga | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | I roto i te kainga | 0.36 | 167 | 194 | 43 | 0.22 |
Ka kitea mai i te Ripanga 2: Ko te ahua o te kiato, te tau pokey me te whakaurunga o te kapia PVC kua whiwhi he tata tonu ma te whakamahi i nga cellulose rereke mo te whakamatautau iti;te hua kapia i riro mai ma te whakamahi i te tauira hydroxypropyl methylcellulose whare He iti ake te rahi o te matūriki toharite.
Ko te Whakaahua 1 e whakaatu ana i nga whakaahua SEM o nga hua kapia PVC i riro mai ma te whakamahi i nga rereke hydroxypropyl methylcellulose.
(1)—He hydroxypropyl methylcellulose kawemai
(2)—Waehanga hydroxypropyl methylcellulose
Fig.1 SEM o nga kapia i hangaia i roto i te 10-L polymerizer i te aroaro o nga rereke hydroxypropyl methyl cellulose
Ka kitea mai i te Whakaahua 1 he rite tonu nga hanganga mata o nga matūriki kapia PVC i hangaia e nga momo marara cellulose.
Hei whakarapopototanga, ka kitea ko te hydroxypropyl methylcellulose whare i whakamatauria i roto i tenei pepa he kaha ki te whakakapi i te hydroxypropyl methylcellulose kawemai.
3. 2 Te whakataurite i te kounga o te PVC resin me te tohu polymerization teitei i roto i te whakamatautau whakaputa
Na te nui o te utu me te tupono o te whakamatautau whakangao, kaore e taea te whakamahi tika te kaupapa whakakapinga o te whakamatautau iti, no reira ko te mahere ko te whakanui i te waahanga o te hydroxypropyl methylcellulose whare i roto i te tauira.Ko nga hua whakamatautau o ia puranga ka whakaatuhia ki te Ripanga 3 e whakaatuhia ana.
Ripanga 3 Nga hua whakamatautau o nga momo whakaputanga rereke
| Puranga | m (Haina hydroxypropyl methyl cellulose): m (hydroxypropyl methyl cellulose kawemai) | Kiato ahua/(g/mL) | Tau pokey/(mL/g) | Plasticizer absorption o 100 g PVC resin/g | Mahinga karekau/% |
| 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 |
Ka kitea mai i te Ripanga 3 ka piki haere te whakamahinga o te hydroxypropyl methyl cellulose o te kainga kia whakakapia katoatia e te hydroxypropyl methyl cellulose te hydroxypropyl methyl cellulose i kawemai.Ko nga tohu matua penei i te whakaurunga plasticizer me te kiato ahua kaore i tino rerekee, e tohu ana ka taea e te hydroxypropyl methylcellulose kainga kua tohua i roto i tenei pepa te whakakapi i te hydroxypropyl methylcellulose kawemai i roto i te mahi.
4 Whakamutunga
Ko te whakamatautau o te hydroxypropyl methyl cellulose o te kainga i runga i te taputapu whakamatautau iti 10 L e whakaatu ana ka taea e ia te whakakapi hydroxypropyl methyl cellulose kawemai;Ko nga hua whakamatautau whakakapinga whakangao e whakaatu ana ka whakamahia te hydroxypropyl methyl cellulose whare mo te hanga kapia PVC, ko nga tohu kounga matua o te kapia PVC kua oti me te kawemai hydroxypropyl methyl cellulose kaore he rereketanga nui.I tenei wa, he iti ake te utu o te cellulose kaainga i te maakete i tera o te cellulose kawemai.No reira, mena ka whakamahia te cellulose o te kaainga ki te whakaputa, ka tino heke te utu mo nga awhina whakaputa.
Wā tuku: Noema-04-2022