Kev cuam tshuam ntawm Resin Stability
PVC resin yog cov khoom siv cua sov, thiab muaj ntau yam tsis xws luag hauv nws cov qauv molecular, xws li ob daim ntawv cog lus, pawg allyl, residual initiator kawg pawg, thiab lwm yam. Lub teeb los tsim cov dawb radicals.Nyob rau hauv qhov kev txiav txim ntawm cov dawb radicals, polyvinyl chloride undergoes dehydrochlorination thiab degradation raws li ib tug saw mechanism.Cov tshuaj tiv thaiv dehydrochlorination tas mus li ua rau cov khoom sib txuas ntawm cov khoom sib txuas ntawm ob daim ntawv cog lus ntawm cov saw tseem ceeb ntawm polyvinyl chloride molecule, uas yog cov qauv chromogenic.Raws li ntev raws li tus naj npawb ntawm cov ntawv sib txuas sib txuas mus txog 5 ~ 7, polyvinyl chloride pib Discoloration, thaum nws dhau 10, nws tig daj, qhov sib txuas txuas txuas ntxiv mus, thiab cov xim ntawm polyvinyl chloride maj mam tob zuj zus, thiab thaum kawg ua xim av lossis txawm dub.Kev tswj xyuas qhov ruaj khov ntawm PVC ntawm kev ua haujlwm kub yog lub hauv paus ntawm tag nrho cov toning thiab whitening ua hauj lwm.
Cov nyhuv ntawm qhov kub thiab txias
PVC yas profiles yog yas thiab tsim ntawm qhov kub ntawm 185 ~ 195 ° C, thiab lub sij hawm cua sov yog ntev li ob peb feeb, uas yuav tsum tau cov pigments thiab brighteners siv kom muaj thermal stability.Rau rutile titanium dioxide, nws cov qauv siv lead ua yog lub voos xwmfab, Ti atoms thiab O atoms tau zoo sib xws, cov qauv siv lead ua ruaj khov heev, thiab nws tseem tuaj yeem tswj xyuas qhov ruaj khov ntawm cov qauv thiab kev ua haujlwm raws li qhov kub thiab txias ntawm PVC profiles;Ultramarine yog aluminium silicate.Sulfur-muaj cov tebchaw, tshav kub kuj tseem zoo heev.Txawm li cas los xij, rau cov tshuaj fluorescent whitening agents, ntau hom fluorescent whitening agents kuj muaj qhov sib txawv ntawm lawv cov kev ua haujlwm kub.
Acid nyhuv
Cov txheej txheem ua PVC yog ib txwm ua nrog rau qhov decomposition ntawm PVC molecules, thiab ib tug loj npaum li cas ntawm hydrogen chloride yog generated thaum lub sij hawm decomposition.Hydrogen chloride gas ntawm qhov kub thiab txias yog corrosive heev thiab acidic.Ntawm peb cov ntaub ntawv saum toj no, TiO2 muaj cov tshuaj tiv thaiv corrosion siab tshaj plaws, ua raws li cov tshuaj fluorescent whitening agents, thiab ultramarine xiav yog qhov phem tshaj (nyob rau hauv ib puag ncig acidic, ultramarine xiav hloov ntawm xiav mus rau dawb thiab tsim cov npuas loj tshaj plaws).Yog vim li cas vim li cas ultramarine xiav tseem siv nyob rau hauv qhov profile formulation es tsis txhob phthalocyanine xiav nrog zoo acid kuj yog vim hais tias lub tinting zog ntawm phthalocyanine xiav yog heev muaj zog, uas yog hais txog 20 ~ 40 npaug ntawm ultramarine xiav.Qhov sib tov muaj peev xwm ntawm lub tov khoom, qhov sib ntxiv ntawm ultramarine xiav nyob rau hauv txhua qhov sib piv tsuas yog 5 ~ 20g.Yog tias nws hloov nrog phthalocyanine xiav, qhov sib ntxiv yog me me, thiab qhov kev ntsuas qhov yuam kev yog qhov loj heev, uas yuav ua rau cov batches ntawm profiles tshwm.Loj chromatic aberration.
Cov nyhuv ntawm adjuvants
Cov khoom siv ntau lawm thiab thev naus laus zis ntawm PVC yas profiles hauv kuv lub teb chaws feem ntau yog los ntawm Tebchaws Europe thiab Tebchaws Meskas.Tseem muaj qee yam ntawm cov hlau lead hauv nws.Cov sulfur uas muaj nyob rau hauv ultramarine xiav yuav cuam tshuam nrog cov hlau lead hauv stabilizer, uas ua rau dub txhuas sulfide polluted profiles.
Cov nyhuv ntawm brightener npaum li cas
Titanium dioxide yog lub hauv paus rau toning thiabntxuav hniav dawbntawm dawb PVC profiles.Raws li tus nqi ntawm titanium dioxide nce, qhov whiteness ntawm cov khoom nce.
Tsis tas li ntawd, raws li tus neeg sawv cev tiv thaiv UV tseem ceeb hauv kev tsim cov ntaub ntawv profiled, ntau npaum li cas ntawm titanium dioxide kuj muaj qee yam yuav tsum tau ua.Feem ntau hais lus, qhov ntau npaum ntawm titanium dioxide yuav tsum ncav cuag 4 ~ 8phr.
Ultramarine xiav yog siv los "npog daj" kom ua tiav lub hom phiaj ntawm kev ua kom dawb.Yog tias qhov ntau npaum li cas me me, cov nyhuv whitening tsis zoo.Yog tias qhov ntau npaum li cas, nws yog qhov yooj yim los ua kom cov khoom siv profiled tshwm xiav thiab tsim cov hmoov txhuas sulfide, uas cuam tshuam rau qhov gloss ntawm cov khoom profiled.Yog li, nws cov koob tshuaj feem ntau yog tswj tau li ntawm 0.5% ntawm cov tshuaj titanium dioxide.
Fluorescent whitening agentsmuaj peev xwm nqus tau ultraviolet rays ntawm ib co wavelength thiab emit lawv nyob rau hauv daim ntawv ntawm pom lub teeb.Nrog rau qhov nce ntawm tus nqi ntawm fluorescent whitening tus neeg sawv cev, qhov whiteness ntawm cov khoom nce;tab sis thaum tus neeg sawv cev fluorescent whitening mus txog ib qho concentration, txuas ntxiv mus ntxiv tsis muaj qhov cuam tshuam loj rau cov xim dawb ntawm PVC, thiab qee zaum nws txo qis, thiab cov nyiaj ntau dua.Kev cuam tshuam ntawm kev ua tau zoo thiab lub cev thiab lub zog ntawm cov khoom siv profiled yuav tsum raug txiav txim siab.
Post lub sij hawm: Mar-26-2022