Wasu abokai sun fuskanci irin wannan yanayin. Ban san dalili ba. Launin wannan jakar wasan ya dushe bayan an daɗe ana amfani da shi. Tun da farko na dauka abu ne da ba zai shude ba, amma yanzu ya shude. Don haka bari mu kalli dalilan da suka sa. Menene dalilin faduwar jakunkunan wasan EVA?
Abubuwan da ke shafar faɗuwar filastikEVAsamfurori. Fadewar samfuran launin filastik yana da alaƙa da juriya na haske, juriya na iskar oxygen, juriya mai zafi, juriya na acid da alkali na pigments da rini, da halayen resin da aka yi amfani da su. Dangane da yanayin aiki da buƙatun amfani na samfuran filastik, abubuwan da aka ambata a sama na abubuwan da ake buƙata na pigments, dyes, surfactants, dispersants, resins mai ɗaukar hoto da abubuwan haɓaka tsufa yakamata a kimanta su gabaɗaya yayin samar da masterbatch kafin zaɓi.
1. Acid da alkali juriya Fadewar samfuran filastik masu launin suna da alaƙa da juriya na sinadarai na mai launi (juriya acid da alkali, juriya na redox).
Misali, molybdenum chromium ja yana da juriya ga dilute acid, amma yana kula da alkali, kuma cadmium yellow ba ya jure acid. Wadannan pigments guda biyu da resin phenolic suna da tasiri mai ƙarfi na ragewa akan wasu masu launi, suna tasiri sosai ga juriya na zafi da juriya na yanayi na masu launi da kuma haifar da faduwa.
2. Antioxidation: Wasu kwayoyin pigments a hankali suna dushewa saboda lalacewar macromolecules ko wasu canje-canje bayan iskar oxygen.
Wannan tsari ya haɗa da yanayin zafi mai zafi a lokacin sarrafawa da oxidation lokacin da aka haɗu da oxidants mai ƙarfi (kamar chromate a cikin rawaya chromium). Lokacin da tabkuna, azo pigments da chrome yellow suka haɗu, launin ja zai shuɗe a hankali.
3. Tsawon yanayin zafi na pigments masu tsayayya da zafi yana nufin matakin asarar nauyi na thermal, discoloration, da fade na pigment a ƙarƙashin yanayin aiki.
Abubuwan da ke cikin inorganic pigments su ne karfe oxides da salts, waɗanda ke da kyakkyawan yanayin zafi da juriya mai zafi. Pigments da aka yi daga mahadi na kwayoyin za su fuskanci canje-canje a tsarin kwayoyin halitta da ƙananan adadin bazuwa a wani zazzabi. Musamman ga samfuran PP, PA, da PET, zafin aiki yana sama da 280 ° C. Lokacin zabar masu launi, a gefe guda, dole ne mu kula da juriya na zafi na pigment, kuma a gefe guda, dole ne mu yi la'akari da lokacin juriya na zafi na pigment. Lokacin juriya zafi yawanci ruwan sama ne 4-10. .
Lokacin aikawa: Jul-12-2024