Gabatarwa

Antioxidants (ko masu daidaita zafi) sune abubuwan da ake amfani dasu don hanawa ko jinkirta lalacewar polymers saboda iskar oxygen ko ozone a cikin yanayi. Su ne abubuwan da aka fi amfani da su a cikin kayan polymer. Rubutun zai fuskanci lalatawar iskar oxygen bayan an gasa shi a yanayin zafi mai zafi ko fallasa ga hasken rana. Abubuwan al'amura kamar tsufa da rawaya za su yi tasiri sosai ga bayyanar da aikin samfurin. Don hana ko rage faruwar wannan yanayin, yawanci ana ƙara antioxidants.

Lalacewar iskar oxygen ta thermal na polymers galibi ana haifar da shi ta nau'in sarkar-nau'in radical free wanda radicals na kyauta ke haifarwa ta hydroperoxides lokacin zafi. Za'a iya hana lalatawar iskar oxygen ta thermal na polymers ta hanyar kamawa ta kyauta da bazuwar hydroperoxide, kamar yadda aka nuna a hoton da ke ƙasa. Daga cikin su, antioxidants na iya hana iskar oxygen da ke sama don haka ana amfani da su sosai.

Nau'in antioxidants

Antioxidantsza a iya raba kashi uku bisa ga ayyukansu (watau tsoma bakinsu cikin tsarin sinadaran auto-oxidation):

sarkar kawo karshen antioxidants: sun fi kama ko cire radicals kyauta da polymer auto-oxidation;

hydroperoxide decomposing antioxidants: sun fi inganta bazuwar bazuwar hydroperoxides a cikin polymers;

karfe ion passivating antioxidants: za su iya samar da barga chelates tare da cutarwa karfe ions, game da shi passivating da catalytic sakamako na karfe ions a kan auto-hadawan abu da iskar shaka tsari na polymers.

Daga cikin nau'ikan antioxidants guda uku, ana kiran su antioxidants masu kawo karshen sarkar antioxidants, galibi masu hana phenols da amines na biyu; sauran nau'ikan guda biyu ana kiran su antioxidants taimako, gami da phosphites da dithiocarbamate karfe salts. Domin samun kwanciyar hankali wanda ya dace da buƙatun aikace-aikacen, ana zaɓar haɗuwa da yawa antioxidants.

Aikace-aikacen antioxidants a cikin sutura

1. Ana amfani da shi a cikin alkyd, polyester, polyester unsaturated
A cikin abubuwan da ke ɗauke da mai na alkyd, akwai ɗakuna biyu zuwa nau'i daban-daban. Guda biyu biyu biyu, shaidu biyu masu yawa, da kuma kulawar haɗin biyu don samar da fa'ida a cikin yanayin zafi, yayin da antioxidants zasu iya lalata launin.

2. An yi amfani da shi a cikin haɗin PU curing wakili
PU curing wakili gabaɗaya yana nufin prepolymer na trimethylolpropane (TMP) da toluene diisocyanate (TDI). Lokacin da resin ya fallasa ga zafi da haske yayin haɗakarwa, urethane ya rushe zuwa amines da olefins kuma ya karya sarkar. Idan amine yana da kamshi, an sanya shi oxidized ya zama chromophore quinone.

3. Aikace-aikace a cikin thermosetting foda coatings
Haɗaɗɗen maganin antioxidant mai ƙarfi na phosphite mai inganci da phenolic antioxidants, wanda ya dace don kare kayan kwalliyar foda daga lalatawar iskar oxygen ta thermal yayin aiki, warkewa, zafi da sauran matakai. Aikace-aikace sun haɗa da epoxy polyester, katange isocyanate TGIC, TGIC madadin, mahadi na epoxy na layi da kuma resins na acrylic thermosetting.

Sabon Kayayyakin Reborn Nanjing yana ba da nau'ikan nau'ikan iri daban-dabanantioxidantsdon filastik, sutura, masana'antun roba.

Tare da haɓakawa da ci gaba na masana'antar sutura, mahimmancin antioxidants don sutura zai zama mafi bayyane, kuma sararin samaniya don ci gaba zai zama mafi girma. A nan gaba, antioxidants za su ci gaba a cikin shugabanci na babban dangi na kwayoyin halitta, multifunctionality, high dace, sabo, compositeness, responsiveness da kore kare muhalli. Wannan yana buƙatar masu sana'a don gudanar da bincike mai zurfi daga duka kayan aiki da kuma aikace-aikace don ci gaba da inganta su, gudanar da bincike mai zurfi game da sifofin tsarin antioxidants, da kuma kara haɓaka sababbin antioxidants masu inganci bisa ga wannan, wanda zai yi tasiri mai zurfi akan aiki da aikace-aikacen masana'antar sutura. Antioxidants don sutura za su ƙara yin amfani da babbar damar su kuma suna kawo fa'idodi masu kyau na tattalin arziki da fasaha.