Zofewa za PVC zimakhala ndi zigawo zina za plasticizer. Plasticizers awa amasamuka, kuchotsa ndi kusinthasintha ku madigiri osiyanasiyana panthawi yachiwiri ndikugwiritsira ntchito zinthuzo. Kutayika kwa plasticizer sikungochepetsa magwiridwe antchito a zinthu za PVC, komanso kuyipitsa pamwamba pa zinthu ndi kulumikizana. Zowonjezereka, zidzabweretsa mavuto angapo ku chilengedwe ndi thanzi la anthu. Chifukwa chake, kusamuka ndi kutulutsa kwa plasticizer kwakhala chopinga chachikulu choletsa kugwiritsa ntchito zinthu zofewa za PVC.

Mu dongosolo la PVC, otsika kachulukidwe polyethylene yokhalaimatha kupangidwa ndi pulasitiki pasadakhale, ndipo torque yamtsogolo imachepetsedwa. Ili ndi mafuta abwino kwambiri amkati ndi kunja. Itha kupititsa patsogolo kuchulukana kwa utoto, kupangitsa kuti zinthu ziziwoneka bwino komanso zimathandizira kupanga bwino.

Zotsatira zoyipa za kusuntha kwa pulasitiki ndi kuchotsedwa
1. Pamene kusamuka ndi kutulutsa kwa plasticizer mu PVC kuli koopsa, zinthuzo zidzasintha kwambiri, zomwe zimapangitsa kuti zikhale zofewa, zowonongeka komanso ngakhale kuphulika kwa zinthu. The precipitates nthawi zambiri kuwononga mankhwala ndi kukhudza yachiwiri processing wa mankhwala. Mwachitsanzo, mamolekyu apulasitiki opangidwa ndi PVC osatsekera madzi amasamuka, ndipo PVC yopanda pulasitiki imachepa ndikuuma, zomwe zingayambitse kulephera kwa madzi. Pamene zinthu zofewa za PVC zimayikidwa ndi zomatira zosungunulira, pulasitiki mkati mwazinthuzo nthawi zambiri imasamukira kumalo omangira, zomwe zimapangitsa kuchepa kwakukulu kwa mphamvu zomangira, zomwe zimabweretsa mavuto monga kugwirizana kofooka kapena degumming. Zinthu zofewa za PVC zikakutidwa kapena kupakidwa utoto, zimakumananso ndi vuto la zokutira kapena utoto wosanjikiza kugwa chifukwa cha kutulutsa kwa plasticizer. PVC yosindikiza, plasticizer m'zigawo ndi taboo lalikulu inki ndi kusindikiza makampani kupanga.
2, M'kati mwa mvula ya plasticizer mu PVC, zida zina, monga ma granules a pigment, zokometsera, antistatic agents ndi stabilizer, zidzatulutsidwa. Chifukwa cha kutayika kwa zigawozi, zinthu zakuthupi za PVC zidzachepa, ndipo katundu wina adzatayika. Mitsinje imeneyi idzawononganso ndi kuwononga zinthu zomwe zimagwirizana kwambiri nazo. Ngati zinthu zofewa za PVC ndi polystyrene ziphatikizidwa, pulasitiki yosunthira kuchokera ku PVC idzakhudza magwiridwe antchito a polystyrene ndikupangitsa kufewetsa kwa zinthu za polystyrene.
Maonekedwe a plasticizer loss
Plasticizers, kupatula poliyesitala ndi ena mkulu maselo kulemera plasticizers, ndi organic ang'onoang'ono maselo zinthu. Akawonjezedwa ku PVC, samapangidwa ndi polymer pa tcheni cha polima cha PVC, koma amaphatikizidwa ndi mamolekyu a PVC ndi hydrogen bond kapena van der Waals mphamvu kuti asunge zinthu zawo zodziyimira pawokha.
Pamene PVC yofewa ikukhudzana ndi sing'anga yokhazikika (gawo la gasi, gawo lamadzimadzi ndi gawo lolimba) kwa nthawi yaitali, plasticizer idzathetsedwa pang'onopang'ono kuchokera ku PVC ndikulowa mkatikati. Malinga ndi ma media osiyanasiyana olumikizirana, mitundu yotayika ya plasticizer imatha kugawidwa kukhala kutayika kwamphamvu, kutayika kwa m'zigawo ndi kutayika kwakusamuka.
Kutayika kwa plasticizer volatilization, m'zigawo ndi kusamuka kumaphatikizapo magawo atatu:
(1) Plasticizer imafalikira kumtunda wamkati;
(2) Malo amkati amasintha kukhala "recumbent";
(3) Kutalikirana ndi pamwamba.

Kutayika kwa plasticizer kumakhudzana ndi kapangidwe kake ka maselo, kulemera kwa maselo, kugwirizana ndi polima, sing'anga, chilengedwe ndi zinthu zina. The volatilization wa plasticizer makamaka zimadalira kulemera kwake maselo ndi kutentha yozungulira, extractability makamaka zimadalira solubility wa plasticizer sing'anga, ndi kuyenda ndi zogwirizana kwambiri ngakhale kwa plasticizer ndi PVC. Kufalikira kwa plasticizer mu PVC kumatha kuchitidwa pansi pazikhalidwe za polima ndi sing'anga zomwe sizingalowe mu polima, kapena pansi pamikhalidwe ya sing'anga yomwe ingalowerere polima. Zosintha ndi machitidwe a polima pamwamba zidzakhudza kufalikira kwa plasticizer. Kuphatikizika kwamawonekedwe a plasticizer ndi njira yovuta, yomwe imagwirizana ndi kulumikizana kwa sing'anga, PVC polima ndi plasticizer.
Zomwe zimakhudzidwa ndi kusamuka kwa pulasitiki ndi kuchotsa
1. Kulemera kwa maselo ndi mapangidwe a maselo a plasticizer
Kukula kwakukulu kwa maselo a plasticizer, kukula kwa magulu omwe ali mu molekyulu, kumakhala kovuta kwambiri kuti afalikire mu PVC yapulasitiki, m'pang'ono pomwe kufika pamwamba, ndi m'munsi mwayi m'zigawo ndi kusamuka. Kuti mukhale ndi kukhazikika bwino, m'pofunika kuti chiwerengero cha maselo a plasticizer chikhale choposa 350. Polyesters ndi phenylpolyacid esters (monga trimellitic acid esters) mapulasitiki omwe ali ndi kulemera kwa maselo oposa 1000 amakhala ndi kukhazikika kwabwino kwambiri.
2. Kutentha kwa chilengedwe Kutentha
kozungulira kwa zinthu za PVC, kumapangitsa kuti mamolekyu a Brownian achulukane kwambiri, komanso mphamvu zambiri pakati pa mamolekyu apulasitiki ndi PVC macromolecules, zomwe zimapangitsa kuti mamolekyu a plasticizer azitha kufalikira pamwamba pa zinthuzo ndi kupitirirabe. sing'anga.
3. Zomwe zili mu pulasitiki
Nthawi zambiri, kuchuluka kwa zigawo za plasticizer mu chilinganizocho, mamolekyu ambiri a plasticizer mu PVC yopangidwa ndi pulasitiki komanso mamolekyu ochulukirapo a plasticizer pamtengowo. Ndikosavuta kuti plasticizer imagwidwa ndi sing'anga yolumikizirana ndikuchotsa kapena kusamuka, ndiyeno mamolekyu amkati apulasitiki amayenda ndikuwonjezera kuchokera kumagulu ambiri kupita kumalo otsika. Pa nthawi yomweyo, plasticizers ang'onoang'ono ndi sing'anga-kakulidwe mu PVC, m'pamenenso mwayi wina kugunda ndi kuchitapo kanthu pakati pa mamolekyu plasticizer, kuti kufooketsa mphamvu yomanga pakati mamolekyu ena plasticizer ndi PVC macromolecules ndi kupanga mayendedwe awo ndi kufalikira mu PVC yosavuta. Chifukwa chake, mumitundu ina, kuchuluka kwa zinthu za plasticizer kumapangitsa kuti pulasitiki ikhale yosavuta kufalikira.
4. Sing'anga
Kutulutsa ndi kusamuka kwa plasticizer sikungogwirizana ndi zinthu za plasticizer palokha, komanso zimagwirizana kwambiri ndi sing'anga yokhudzana. The physicochemical katundu wa madzi sing'anga kukhudzana ndi plasticized PVC ndi zinthu zikuluzikulu zimakhudza m'zigawo za plasticizer. Ma plasticizers ndi osavuta kutulutsa ndi petulo kapena zosungunulira zamafuta, koma zovuta kutulutsa ndi madzi.
5. Nthawi
Malingana ndi zolemba, chiwerengero cha kusamuka kwa DOP mu filimu ya PVC chikugwirizana ndi nthawi. Pa gawo loyambirira la kusamuka, kuchuluka kwake kumathamanga. Kuchuluka kwa plasticizer kusamukira kumtunda ndikofanana ndi masikweya a nthawi yakusamuka. Kenaka, ndi nthawi yowonjezera, chiwerengero cha kusamuka chimachepa pang'onopang'ono ndipo chimafika pamtunda pambuyo pa nthawi inayake (720h kumanzere ndi kumanja).

Njira zothetsera mpweya ndi kusamuka kwa PVC plasticizer
1. Kuwonjezera poliyesitala plasticizer
Polyester plasticizer ndi kuyanjana kwabwino ndi DOP ndi ena ang'onoang'ono plasticizers maselo. Pakakhala kuchuluka kwa polyester plasticizer mu plasticizer ya PVC, imatha kukopa ndikukonza mapulasitiki ena kuti asamafalikire pamwamba pa zinthu za PVC, kuti achepetse ndikuletsa kusamuka ndi kutulutsa kwa plasticizer.
2. Kuwonjezera nanoparticles
Kuwonjezera kwa nanoparticles kungachepetse kutayika kwa kuyenda mu PVC yofewa ndikuwongolera ntchito yautumiki ndi moyo wautumiki wa zipangizo zofewa za PVC. Kutha kwa nanoparticles kosiyanasiyana kuletsa kusamuka kwa plasticizer ndikosiyana, ndipo zotsatira za nano SiO2 ndizabwino kuposa za nano CaCO3.

3. Gwiritsani ntchito zakumwa za ayoni

Ionic madzi amatha kuwongolera kutentha kwa galasi la polima pamlingo waukulu wa kutentha. Zotanuka modulus zazinthu zomwe zimawonjezeredwa ndi madzi a ionic ndizofanana ndi zomwe DOP imagwiritsidwa ntchito ngati pulasitiki. Madzi a Ionic ndi abwino m'malo mwa plasticizer chifukwa cha kutsika kwake kutentha kwambiri, kutsika pang'ono komanso kukhazikika kwa UV.
4. Kupopera mbewu mankhwalawa pamwamba zoteteza ❖ kuyanika
wosanjikiza zinthu zosasuntha pa polima pamwamba kuchepetsa leaching ndi kusamuka kwa plasticizer. Choyipa cha njirayi ndikuti chingachepetse kusinthasintha kwazinthu. Komabe, zoyeserera zikuwonetsa kuti ukadaulo wokutira uwu ungalepheretse kutulutsa kwa plasticizer ndipo uli ndi chiyembekezo chogwiritsa ntchito kwambiri pachipatala cha PVC.
5. Kulumikizana kwapamtunda
M'madzi okhala ndi chothandizira chosinthira gawo, malo apulasitiki amasinthidwa ndi sodium sulfide. Pansi pa kuwala, pamwamba pa PVC mankhwala amapanga dongosolo maukonde, amene angathe kuteteza kusamuka kwa plasticizer. PVC yofewa yomwe imathandizidwa ndi njirayi ndiyoyenera kwambiri kugwiritsidwa ntchito pazida zamankhwala ndi zofananira.
6. Kusintha kwa pamwamba
The leaching ya plasticizer mu polima njira akhoza kulamulidwa ndi kusintha makhalidwe a polima pamwamba. Pakati pa matekinoloje ambiri osintha, kulumikiza polima wosungunuka m'madzi pamwamba ndi njira imodzi yayikulu.
Akuti njira Ankalumikiza msomali padziko zofewa PVC ayenera kugwiritsidwa ntchito kumapangitsanso hydrophilicity wa gawo lapansi pamwamba, kuti ziletsa leaching wa plasticizer.
Komanso, ntchito gawo kutengerapo chothandizira ndi thiosulfate anion m'malo chlorine maatomu mu PVC mu amadzimadzi njira njira kungathandizenso pamwamba hydrophilicity ndi kupewa leaching ndi kulanda plasticizer mu zosungunulira zosiyanasiyana monga hexane.
Kutsiliza:
Kuchotsa ndi kusamuka kwa plasticizer ndi imodzi mwamavuto ofunikira pakugwiritsa ntchito zinthu zofewa za PVC. Ngati sichingathetsedwe bwino, sichidzangokhudza ntchito yautumiki ndi zotsatira za zinthu zofewa za PVC, komanso kubweretsa mavuto ena ku chilengedwe cha anthu komanso thanzi la anthu. Choncho, vutoli lakopa chidwi kwambiri.
Qingdao Sainuo Chemical Co., Ltd. Ndife opanga sera ya PE, sera ya PP, sera ya OPE, sera ya EVA, PEMA, EBS, Zinc / Calcium Stearate .... Zogulitsa zathu zadutsa REACH, ROHS, PAHS, FDA kuyesa. Sainuo khalani otsimikiza sera, landirani kufunsa kwanu! Webusaiti:https://www.sanowax.com
E-mail: sales@qdsainuo.com
               malonda1@qdsainuo.com
Adilesi:Room 2702,Block B, Suning Building, Jingkou Road, Licang District, Qingdao, Chinac