Gabatarwa

Antioxidants (ko masu daidaita zafi) ƙari ne da ake amfani da su don hana ko jinkirta lalacewar polymers saboda iskar oxygen ko ozone a cikin sararin samaniya. Su ne ƙarin da aka fi amfani da su a cikin kayan polymer. Rufin zai fuskanci lalacewar iskar shaka bayan an gasa shi a yanayin zafi mai yawa ko kuma a fallasa shi ga hasken rana. Abubuwa kamar tsufa da rawaya zasu shafi bayyanar da aikin samfurin sosai. Domin hana ko rage faruwar wannan yanayin, yawanci ana ƙara antioxidants.

Lalacewar iskar shaka ta hanyar zafi na polymers galibi yana faruwa ne sakamakon amsawar free radicals mai nau'in sarkar da free radicals da hydroperoxides ke samarwa lokacin da aka yi zafi. Lalacewar iskar shaka ta hanyar zafi na polymers na iya hana ta hanyar kama free radicals da kuma rugujewar hydroperoxide, kamar yadda aka nuna a cikin hoton da ke ƙasa. Daga cikinsu, antioxidants na iya hana iskar shaka ta sama kuma saboda haka ana amfani da su sosai.

Nau'ikan antioxidants

Magungunan hana tsufaza a iya raba su zuwa rukuni uku bisa ga ayyukansu (watau, shigarsu cikin tsarin sinadarai na auto-oxidation):

masu hana antioxidants a sarkar sarkar: galibi suna kamawa ko cire free radicals da polymer auto-oxidation ke samarwa;

magungunan hana tsufa na hydroperoxide: galibi suna haɓaka rugujewar hydroperoxides marasa tsattsauran ra'ayi a cikin polymers;

antioxidants masu hana ion ƙarfe: suna iya samar da chelates masu ƙarfi tare da ions na ƙarfe masu cutarwa, ta haka suna lalata tasirin ions na ƙarfe akan tsarin oxidation na polymers.

Daga cikin nau'ikan antioxidants guda uku, antioxidants masu hana sarka ana kiransu antioxidants na farko, galibi suna hana phenols da kuma aminos na aromatic na biyu; sauran nau'ikan guda biyu ana kiransu antioxidants masu taimako, gami da phosphites da gishirin ƙarfe na dithiocarbamate. Domin samun rufin da ya dace da buƙatun amfani, yawanci ana zaɓar haɗin antioxidants da yawa.

Amfani da antioxidants a cikin maganin shafawa

1. Ana amfani da shi a cikin alkyd, polyester, polyester mara cika
A cikin abubuwan da ke ɗauke da mai na alkyd, akwai haɗin gwiwa biyu zuwa matakai daban-daban. Haɗin gwiwa biyu guda ɗaya, haɗin gwiwa biyu da yawa, da haɗin gwiwa biyu da aka haɗa ana iya haɗa su cikin sauƙi don samar da peroxides a yanayin zafi mai yawa, wanda ke sa launin ya yi duhu, yayin da antioxidants na iya lalata hydroperoxides don haskaka launin.

2. Ana amfani da shi wajen haɗa maganin warkar da PU
Maganin warkarwa na PU gabaɗaya yana nufin prepolymer na trimethylolpropane (TMP) da toluene diisocyanate (TDI). Lokacin da resin ya fallasa zafi da haske yayin haɗa shi, urethane yana rikidewa ya zama amines da olefins kuma ya karya sarkar. Idan amine ɗin yana da ƙamshi, ana haɗa shi da oxidized don ya zama quinone chromophore.

3. Amfani da shi a cikin rufin foda na thermosetting
Wani maganin hana kumburi mai hade da sinadarin phosphite da phenolic antioxidants masu inganci, wanda ya dace da kare murfin foda daga lalacewar yanayin zafi yayin sarrafawa, warkarwa, zafi fiye da kima da sauran hanyoyin aiki. Amfani da shi sun haɗa da polyester epoxy, toshewar isocyanate TGIC, madadin TGIC, linear epoxy mahadi da thermosetting acrylic resins.

Sabbin Kayan Aiki na Nanjing Reborn suna ba da nau'ikan kayan aiki daban-dabanantioxidantsdon masana'antar filastik, shafi, da roba.

Tare da sabbin abubuwa da ci gaban masana'antar shafa, mahimmancin antioxidants don shafa zai bayyana sosai, kuma sararin ci gaba zai kasance mai faɗi. A nan gaba, antioxidants za su haɓaka ta hanyar babban nauyin kwayoyin halitta, ayyuka da yawa, inganci mai yawa, sabo, haɗaka, amsawa da kare muhalli kore. Wannan yana buƙatar masu aiki su gudanar da bincike mai zurfi daga ɓangarorin inji da aikace-aikacen don ci gaba da inganta su, gudanar da bincike mai zurfi kan halayen tsarin antioxidants, da kuma ƙara haɓaka sabbin antioxidants masu inganci bisa ga wannan, wanda zai yi tasiri mai zurfi akan sarrafawa da amfani da masana'antar shafa. Antioxidants don shafa za su ƙara yin amfani da babban ƙarfinsu kuma su kawo fa'idodi masu kyau na tattalin arziki da fasaha.