Manyan dalilai guda hudu na faduwar jakunkuna na kayan aikin filastik EVA

Na yi imani mutane da yawa sun damu sosai game da matsalar faɗuwar filastikEVA kayan aiki jakunkuna, don haka menene ke haifar da jakunkuna na kayan aiki su ɓace? Rushewar 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 kaddarorin resin da aka yi amfani da su. Bari mu taƙaita shi a ƙasa.

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 tsarke 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 aiki 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.

Inorganic pigments sun hada da karfe oxides da salts, wanda ke da kyau thermal kwanciyar hankali da kuma high zafi juriya. 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. .

4. Hasken Hasken haske na masu launi kai tsaye yana rinjayar faɗuwar samfuran.

Don samfurori na waje waɗanda aka fallasa zuwa haske mai ƙarfi, ƙarancin haske (sunfastness) matakin launin launi da aka yi amfani da shi shine muhimmiyar alama. Idan matakin saurin haske ba shi da kyau, samfurin zai shuɗe da sauri yayin amfani. Matsayin juriya na haske da aka zaɓa don samfuran jure yanayin ya kamata ya zama ƙasa da matakin shida, kuma yana da kyau a zaɓi matakan bakwai ko takwas. Don samfuran cikin gida, ana iya zaɓar matakin huɗu ko biyar.

Hasken juriya na resin mai ɗaukar hoto shima yana da babban tasiri akan canjin launi. Bayan hasken ultraviolet ya haskaka resin, tsarinsa na kwayoyin ya canza kuma launi ya bushe. Ƙara masu daidaita haske kamar ultraviolet absorbers zuwa masterbatch na iya inganta juriyar haske na masu launi da samfuran filastik masu launi.