Okwu Mmalite

Ihe ndị na-egbochi ọrịa (ma ọ bụ ihe ndị na-eme ka okpomọkụ sie ike) bụ ihe mgbakwunye e ji egbochi ma ọ bụ gbuo oge mmebi nke polima n'ihi oxygen ma ọ bụ ozone n'ikuku. Ha bụ ihe mgbakwunye kachasị eji eme ihe na ihe ndị e ji polima mee. Ihe mkpuchi ga-emebi okpomọkụ mgbe e mechara ya n'ọkụ dị elu ma ọ bụ kpughee ya na anyanwụ. Ihe ndị dị ka ịka nká na ịcha odo ga-emetụta ọdịdị na arụmọrụ nke ngwaahịa ahụ nke ukwuu. Iji gbochie ma ọ bụ belata ihe omume a, a na-agbakwụnyekarị ihe ndị na-egbochi ọrịa.

Mmebi nke okpomọkụ nke polima na-abụkarị site na mmeghachi omume free radicals nke ụdị yinye nke sitere na free radicals nke hydroperoxides na-emepụta mgbe a na-ekpo ọkụ. Enwere ike igbochi mmebi okpomọkụ nke polima site na njide free radicals na mmebi hydroperoxide, dịka egosiri na eserese dị n'okpuru. N'ime ha, antioxidants nwere ike igbochi oxidation dị n'elu ma ya mere a na-eji ya eme ihe nke ukwuu.

Ụdị antioxidants

Ihe ndị na-egbochi ọrịa oxidantsenwere ike kewaa ya n'ime ụdị atọ dịka ọrụ ha si dị (ya bụ, ntinye aka ha na usoro kemịkalụ auto-oxidation):

ihe ndị na-egbochi antioxidants n'usoro: ha na-ejidekarị ma ọ bụ wepụ ihe ndị na-akpata free radicals nke polymer auto-oxidation mepụtara;

ihe ndị na-egbochi mmebi nke hydroperoxide: ha na-akwalite mmebi nke hydroperoxides na-abụghị nke radical na polymers;

ihe ndị na-egbochi ion ígwè: ha nwere ike ịmepụta chelates kwụsiri ike na ion ígwè na-emerụ ahụ, si otú a na-eme ka mmetụta nke ion ígwè dị na usoro oxidation auto-oxidation nke polymers.

N'ime ụdị antioxidants atọ ahụ, a na-akpọ antioxidants ndị na-akwụsị chain-terminating antioxidants, nke bụ isi ihe mgbochi phenols na nke abụọ aromatic amines; a na-akpọ ụdị antioxidants ndị ọzọ atheroxidants, gụnyere phosphites na nnu metal dithiocarbamate. Iji nweta mkpuchi kwụsiri ike nke na-emezu ihe achọrọ maka ojiji, a na-ahọrọkarị ngwakọta nke ọtụtụ antioxidants.

Iji antioxidants eme ihe n'ime ihe mkpuchi

1. Ejiri ya na alkyd, polyester, na unsaturated polyester
N'ime ihe ndị nwere mmanụ alkyd, enwere njikọ abụọ n'ogo dị iche iche. A na-eme ka njikọ abụọ otu otu, njikọ abụọ dị iche iche, na njikọ abụọ a na-ejikọta ọnụ dị mfe iji mepụta peroxides na oke okpomọkụ, na-eme ka agba ahụ gbaa ọchịchịrị, ebe antioxidants nwere ike ịgbaze hydroperoxides iji mee ka agba ahụ dị nro.

2. Ejiri ya mee ihe na njikọta nke ihe na-agwọ PU
Ihe na-agwọ PU na-abụkarị prepolymer nke trimethylolpropane (TMP) na toluene diisocyanate (TDI). Mgbe resin ahụ kpugheere okpomọkụ na ìhè n'oge mmepụta ya, urethane na-agbaze ka ọ bụrụ amines na olefins ma gbajie agbụ ahụ. Ọ bụrụ na amine ahụ na-esi ísì ụtọ, a na-eme ka ọ bụrụ oxidized ka ọ ghọọ quinone chromophore.

3. Ngwa na mkpuchi ntụ ntụ thermosetting
Ngwakọta antioxidant nke phosphite na phenolic antioxidants dị elu, nke dị mma maka ichebe mkpuchi ntụ ntụ site na mbibi okpomọkụ oxidative n'oge nhazi, ọgwụgwọ, oke okpomọkụ na usoro ndị ọzọ. Ngwa ndị a gụnyere polyester epoxy, blocked isocyanate TGIC, TGIC substitutes, linear epoxy compounds na thermosetting acrylic resins.

Ihe Ndị Dị Ọhụrụ Nanjing Reborn na-enye ụdị dị iche icheantioxidantsmaka ụlọ ọrụ plastik, mkpuchi, na rọba.

Site na ihe ọhụrụ na ọganihu nke ụlọ ọrụ mkpuchi, mkpa nke antioxidants maka mkpuchi ga-apụta ìhè nke ọma, ohere maka mmepe ga-abakwa ụba. N'ọdịnihu, antioxidants ga-etolite n'akụkụ oke molekul dị elu, ọtụtụ ọrụ, arụmọrụ dị elu, ọhụrụ, njikọta, nzaghachi na nchekwa gburugburu ebe obibi akwụkwọ ndụ akwụkwọ ndụ. Nke a chọrọ ka ndị ọrụ mee nnyocha miri emi site na ma usoro na ojiji iji melite ha mgbe niile, mee nnyocha miri emi na njirimara nhazi nke antioxidants, ma mepụta antioxidants ọhụrụ na nke dị irè dabere na nke a, nke ga-enwe mmetụta dị ukwuu na nhazi na itinye n'ọrụ nke ụlọ ọrụ mkpuchi. Antioxidants maka mkpuchi ga-eji ike ha dị ukwuu mee ihe ma weta uru akụ na ụba na teknụzụ dị mma.