Okwu mmalite

Antioxidants (ma ọ bụ okpomọkụ stabilizers) bụ ihe mgbakwunye eji egbochi ma ọ bụ igbu oge mmebi nke polymers n'ihi oxygen ma ọ bụ ozone na ikuku. Ha bụ ihe mgbakwunye a na-ejikarị eme ihe na ihe polymer. Mkpuchi ga-enweta mmebi oxidation thermal mgbe akpọchara ya na okpomọkụ dị elu ma ọ bụ kpughee na ìhè anyanwụ. Phenomena dị ka ịka nká na ịcha edo edo ga-emetụta ọdịdị na arụmọrụ nke ngwaahịa ahụ nke ukwuu. Iji gbochie ma ọ bụ ibelata omume nke omume a, a na-agbakwunyekarị antioxidants.

Mbibi oxidation thermal oxidation nke polymers bụ n'ụzọ bụ isi n'ụdị mmeghachi omume radical free nke na-amalite site na radicals efu nke hydroperoxides na-emepụta mgbe ọkụ. Enwere ike igbochi mmebi oxidation thermal nke polymer site na njide radical free na hydroperoxide decomposition, dị ka egosiri na foto dị n'okpuru. N'ime ha, antioxidants nwere ike igbochi oxidation dị n'elu ya mere a na-eji ya eme ihe.

Ụdị antioxidants

Antioxidantsenwere ike kewaa ụzọ atọ dịka ọrụ ha siri dị (ya bụ, ntinye aka ha na usoro kemịkalụ auto-oxidation):

yinye na-akwụsị antioxidants: ha na-ebutekarị ma ọ bụ wepụ radicals free nke polymer auto-oxidation mepụtara;

hydroperoxide decomposing antioxidants: ha tumadi na-akwalite ndị na-abụghị radical decomposition nke hydroperoxides na polymers;

metal ion passivating antioxidants: ha nwere ike ịmepụta chelates kwụsiri ike na ion metal na-emerụ ahụ, si otú ahụ na-agafe mmetụta catalytic nke ion metal na usoro auto-oxidation nke polymers.

N'ime ụdị antioxidants atọ ahụ, a na-akpọ ndị antioxidants nke na-akwụsị yinye, nke bụ isi ihe mgbochi phenols na amines aromatic nke abụọ; A na-akpọ ụdị abụọ ndị ọzọ antioxidants inyeaka, gụnyere phosphites na dithiocarbamate metal salts. Iji nweta mkpuchi kwụsiri ike nke na-emezu ngwa ngwa, a na-ahọrọkarị ngwakọta nke ọtụtụ antioxidants.

Ngwa nke antioxidants na mkpuchi

1. Ejiri ya na alkyd, polyester, polyester na-adịghị mma
N'ime ihe ndị nwere mmanụ nke alkyd, enwere njikọ abụọ na ogo dị iche iche. Otu njikọ abụọ, ọtụtụ njikọ abụọ, na njikọ abụọ jikọtara ọnụ na-adị mfe oxidized ka ọ bụrụ peroxides na okpomọkụ dị elu, na-eme ka agba agba ọchịchịrị, ebe antioxidants nwere ike imebi hydroperoxides iji mee ka agba dị mfe.

2. Eji na njikọ nke PU na-agwọ ọrịa
Onye na-agwọ ọrịa PU n'ozuzu na-ezo aka na prepolymer nke trimethylolpropane (TMP) na toluene diisocyanate (TDI). Mgbe resin na-ekpuchi ọkụ na ọkụ n'oge nhazi, urethane na-aghọ amines na olefins ma gbajie agbụ ahụ. Ọ bụrụ na amine na-esi ísì ụtọ, ọ na-eme ka ọ bụrụ chromophore quinone.

3. Ngwa na thermosetting ntụ ntụ mkpuchi
Ngwakọta antioxidant agwakọta nke phosphite dị elu na antioxidants phenolic, dabara maka ichebe mkpuchi ntụ ntụ site na mmebi oxidative thermal n'oge nhazi, ọgwụgwọ, ikpo ọkụ na usoro ndị ọzọ. Ngwa gụnyere polyester epoxy, egbochiri isocyanate TGIC, ihe nnọchi TGIC, ogige epoxy linear na resins acrylic thermosetting.

Nanjing Reborn New Materials na-enye ụdị dị iche icheantioxidantsmaka plastik, mkpuchi, ụlọ ọrụ roba.

Site na ihe ọhụrụ na ọganihu nke ụlọ ọrụ mkpuchi, mkpa nke antioxidants maka mkpuchi ga-apụta ìhè karị, na ohere maka mmepe ga-abawanye. N'ọdịnihu, antioxidants ga-etolite na ntụziaka nke elu ikwu molekul mass, multifunctionality, elu arụmọrụ, ọhụrụ, compositeness, responsiveness na green gburugburu ebe obibi nchebe. Nke a na-achọ ndị na-eme nchọpụta ka ha na-eme nchọpụta miri emi site na usoro na akụkụ ngwa iji nọgide na-eme ka ha dịkwuo mma, na-eme nchọpụta miri emi na njirimara nhazi nke antioxidants, na n'ihu ịzụlite ọhụrụ na arụmọrụ antioxidants dabeere na nke a, nke ga-enwe mmetụta miri emi na nhazi na ngwa nke ụlọ ọrụ mkpuchi. Antioxidants maka mkpuchi ga-emewanyewanye ike ha ma weta uru akụ na ụba na teknụzụ mara mma.