Impembelelo yoZinzo lweResin
I-resin ye-PVC yinto ephazamisayo ubushushu, kwaye kukho iziphene ezininzi kwisakhiwo sayo se-molecular, ezifana ne-double bonds, amaqela e-Allyl, amaqela asele e-initiator ekupheleni, njl. Ngokutsho kwenkqubo ye-radicals yamahhala, ezi ziphene zivulwa ngokulula bubushushu kwaye ukukhanya ukwenza iiradicals zasimahla.Ngaphantsi kwesenzo se-radicals yamahhala, i-polyvinyl chloride idlula i-dehydrochlorination kunye nokuthotywa ngokwendlela yekhonkco.I-reaction ye-dehydrochlorination eqhubekayo ivelisa ukulandelelana kwe-polyene ye-conjugated double bonds kwi-chain chain ye-molecule ye-polyvinyl chloride, eyisakhiwo se-chromogenic.Logama inani leebhondi ezimbini ezidityanisiweyo zifikelela ku-5 ~ 7, i-polyvinyl chloride iqala ukuDiscoloration, xa idlula i-10, ijika ibe tyheli, ulandelelwano oludityanisiweyo luqhubeka lukhula, kwaye umbala we-polyvinyl chloride ngokuthe ngcembe uya nzulu, kwaye ekugqibeleni ube mdaka okanye nokuba mnyama.Ukugcina uzinzo lwePVC ekuqhubeni amaqondo obushushu sisiseko sawo wonke umsebenzi we-toning kunye nomhlophe.
Isiphumo sobushushu
Iiprofayili zeplastiki zePVC zenziwe ngeplastiki kwaye zenziwe kwiqondo lobushushu le-185 ~ 195 °C, kwaye ixesha lokufudumeza lide kangangemizuzu emininzi, efuna i-pigments kunye nezikhanyisi ezisetyenziselwa ukuzinza okuphezulu kwe-thermal.I-rutile titanium dioxide, isakhiwo sayo sekristal yicube, ii-athomu ze-Ti kunye ne-athomu ze-O zicwangciswe ngokusondeleyo, isakhiwo se-crystal sizinzile kakhulu, kwaye singakwazi ukugcina ukuzinza kwesakhiwo kunye nomsebenzi phantsi kobushushu bokusebenza kweeprofayili ze-PVC;I-ultramarine yi-aluminium silicate.Iikhompawundi ezinesulfure, ukumelana nobushushu nako kuhle kakhulu.Nangona kunjalo, kwii-agent ezimhlophe ze-fluorescent, iintlobo ezahlukeneyo ze-fluorescent whitening agents nazo zinomohluko ekusebenzeni kwazo kokumelana nobushushu.
Isiphumo se-Acid
Inkqubo yokucubungula i-PVC isoloko ihamba kunye nokuchithwa kwee-molecule ze-PVC, kunye nenani elikhulu le-hydrogen chloride iveliswa ngexesha lokubola.Irhasi yeHydrogen chloride kwiqondo lobushushu obuphezulu yonakalisa kakhulu kwaye ineasidi.Phakathi kwezi zixhobo zintathu zingasentla, i-TiO2 inokumelana ne-asidi ephezulu kakhulu, ilandelwa yi-fluorescent whitening agents, kunye ne-ultramarine eluhlaza okwesibhakabhaka yeyona nto imbi (kwindawo ene-acidic, i-ultramarine eluhlaza okwesibhakabhaka iyatshintsha ukusuka eluhlaza okwesibhakabhaka ukuya kumhlophe kwaye ivelise amaqamza amakhulu).Isizathu sokuba i-ultramarine eluhlaza okwesibhakabhaka isasetyenziswa kwiprofayili yokwenziwa endaweni ye-phthalocyanine eluhlaza okwesibhakabhaka ene-asidi engcono yokuxhathisa ikakhulu ngenxa yokuba amandla e-tinting e-phthalocyanine blue yomelele kakhulu, emalunga ne-20 ~ 40 amaxesha e-ultramarine blue.Umthamo wokuxuba womxube, inani elongezelelweyo le-ultramarine eluhlaza okwesibhakabhaka kumlinganiselo ngamnye ngu-5 ~ 20g kuphela.Ukuba ithathelwe indawo nge-phthalocyanine eluhlaza okwesibhakabhaka, imali yokongeza incinci kakhulu, kwaye impazamo yokulinganisa inkulu kakhulu, eya kubangela ukuba iibhetshi zeeprofayili zivele.Ukuphambuka okunzulu kwechromatic.
Isiphumo se-adjuvants
Izixhobo zokuvelisa kunye nobuchwepheshe beeprofayili zeplastiki zePVC kwilizwe lam zithunyelwa kakhulu eYurophu nase-United States.Kusekho umlinganiselo othile welothe kuyo.Isulfure equlethwe kwi-ultramarine eluhlaza okwesibhakabhaka inokusebenzisana ne-lead kwi-stabilizer, ekhokelela kwiiprofayili ezingcolileyo ze-sulfide emnyama.
Umphumo wedosi ekhanyayo
I-Titanium dioxide sisiseko se-toning kunyeukwenza mhlopheyeeprofayile zePVC ezimhlophe.Njengoko inani le-titanium dioxide landa, ubumhlophe bemveliso buyanda.
Ukongeza, njengeyona arhente ikhuselayo ye-UV ekuqulunqweni kwezinto ezineprofayili, idosi ye-titanium dioxide nayo ineemfuno ezithile.Ngokuqhelekileyo, umthamo we-titanium dioxide kufuneka ufikelele kwi-4 ~ 8phr.
I-ultramarine eluhlaza okwesibhakabhaka isetyenziselwa "ukugubungela umthubi" ukufezekisa injongo yokwenza mhlophe.Ukuba idosi incinci kakhulu, umphumo wobumhlophe awulungile.Ukuba idosi inkulu kakhulu, kulula ukwenza ukuba izinto ezifakwe kwiprofayili zibonakale ziluhlaza okwesibhakabhaka kwaye zivelise i-sulfide ekhokelela ngakumbi, echaphazela iglosi yomphezulu weprofayili.Ngoko ke, idosi yayo idla ngokulawulwa ukuba ibe malunga ne-0.5% yedosi ye-titanium dioxide.
I-Fluorescent whitening agentsinokufunxa ngokufanelekileyo imitha ye-ultraviolet yobude obuthile kwaye iyikhuphe ngendlela yokukhanya okubonakalayo.Ngokunyuka kwenani le-agent emhlophe ye-fluorescent, ubumhlophe bemveliso buyanda;kodwa xa i-agent emhlophe ye-fluorescent ifikelela kugxininiso oluthile, ukuqhubeka nokunyusa isixa akunampembelelo ebalulekileyo kumhlophe kwiiprofayili ze-PVC, kwaye ngamanye amaxesha kuncipha, kwaye isixa sikhulu.Impembelelo ekusebenzeni kokucubungula kunye neempawu zomzimba kunye noomatshini bezinto ezifakwe kwiprofayili kufuneka ziqwalaselwe.
Ixesha lokuposa: Mar-26-2022