Polyvinyl chloride migration thiab weatherability

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Polyvinyl chloride migration thiab weatherability

Mobility

Mobility tshwm sim tsuas yog nyob rau hauv cov khoom yas PVC thiab thaum dyes los yog organic pigments siv. Qhov hu ua kev tsiv teb tsaws yog ib feem ntawm cov xim soluble lossis cov xim organic uas muaj nyob hauv cov kuab tshuaj ib puag ncig. Lub plasticizer nkag mus rau saum npoo ntawm cov khoom siv PVC, thiab cov khoom siv zas zas yaj kuj tau coj mus rau saum npoo ntawm cov khoom, yog li ua rau kev sib koom ua ke. Los ntshav, hnyav los ntshav los yog tawg paj. [6]

Lwm qhov teeb meem yog "fouling." Nws txhais tau hais tias tus neeg saib xyuas xim raug tso tawm ntawm lub cev thaum lub sijhawm xim vim tias nws tsis zoo los yog tsis sib haum nrog cov xim xim, thiab muab tso rau saum npoo ntawm cov khoom siv ua haujlwm (xws li cov phab ntsa sab hauv ntawm lub thoob ntawm lub extruder thiab sab hauv phab ntsa ntawm lub qhov tuag). .

Huab cua tsis kam

Hais txog lub peev xwm ntawm pigments kom tiv taus ntau yam huab cua. Cov no suav nrog pom thiab ultraviolet lub teeb, noo noo, qhov kub thiab txias, atmospheric chlorination, thiab chemicals ntsib thaum siv cov khoom. Qhov tseem ceeb tshaj plaws weatherability, nrog rau tsis-fading, hmoov tsis kam thiab durability ntawm lub cev. Organic pigments txawv vim lawv cov qauv sib txawv. Tsis tas li ntawd, nyob rau hauv cov formulations uas muaj cov xim dawb, lub weatherability ntawm pigments yog heev cuam tshuam.

Lub fading, darkening los yog hue hloov ntawm cov xim yog feem ntau tshwm sim los ntawm lub reactive noob ntawm cov xim. Cov noob reactive no tuaj yeem cuam tshuam nrog cov dej noo lossis tshuaj lom neeg hauv huab cua, acids thiab hauv paus. Piv txwv li, cadmium daj ploj nyob rau hauv lub zog ntawm noo noo thiab tshav ntuj. Lissol liab muaj lub teeb pom kev zoo thiab tsim nyog rau feem ntau cov ntawv thov sab hauv tsev, thiab yog qhov tsis zoo rau kev siv sab nraum zoov uas muaj cov kua qaub thiab alkali.

Txoj kev ntsuas dehydrochlorination tau ntsuas ntawm qhov kub ntawm 180 degree C raws li JIS-K-6723. Raws li lub sij hawm ntawm dechlorination ntawm uncolored polyvinyl chloride compound, lub elongation los yog retardation lub sij hawm yog nyob rau ntawm lub sij hawm ntawm 5% thiab 10%, thiab tus nqi tsis zoo qhia tau hais tias ceev decomposition.