Nhanganyaya

Antioxidants (kana heat stabilizers) zvinowedzera zvinoshandiswa kuvharidzira kana kunonoka kuparara kwemapolymers nekuda kweokisijeni kana ozone mumhepo. Ndiwo anonyanya kushandiswa ekuwedzera mune polymer zvinhu. Mabhachi anozosangana nekupisa oxidation degradation mushure mekubikwa nekupisa kwakanyanya kana kuratidzwa nezuva. Phenomena senge kuchembera uye yero zvinokanganisa zvakanyanya kutaridzika uye kuita kwechigadzirwa. Kuti udzivise kana kuderedza kuitika kwechiitiko ichi, antioxidants inowanzowedzerwa.

Thermal oxidation degradation yemapolymers inonyanya kukonzerwa neketani-mhando yemahara radical reaction inotangwa nemahara radicals anogadzirwa ne hydroperoxides kana yapiswa. Thermal oxidation degradation yemapolymers inogona kuvharwa nemahara radical capture uye hydroperoxide decomposition, sezvinoratidzwa mumufananidzo uri pazasi. Pakati pavo, antioxidants inogona kuvharidzira iyo oxidation iri pamusoro uye saka inoshandiswa zvakanyanya.

Mhando dze antioxidants

Antioxidantsinogona kupatsanurwa muzvikamu zvitatu zvinoenderana nemabasa avo (kureva, kupindira kwavo mune auto-oxidation kemikari process):

cheni inopedza antioxidants: ivo vanonyanya kubata kana kubvisa emahara radicals anogadzirwa ne polymer auto-oxidation;

hydroperoxide decomposing antioxidants: ivo vanonyanya kukurudzira iyo isiri-radical decomposition yehydroperoxides mumapolymers;

metal ion passivating antioxidants: vanogona kugadzira chelates yakagadzikana ine inokuvadza simbi ions, nekudaro ichipfuura iyo catalytic mhedzisiro yesimbi ion pane auto-oxidation maitiro emapolymers.

Pakati pemhando nhatu dze antioxidants, chain-terminating antioxidants inonzi primary antioxidants, kunyanya inodzivisa phenols uye yechipiri inonhuwira amines; mamwe marudzi maviri anonzi anobatsira antioxidants, anosanganisira phosphites uye dithiocarbamate simbi munyu. Kuti uwane yakagadzika coating inosangana nezvinodiwa zvekushandisa, musanganiswa weakawanda antioxidants inowanzo sarudzwa.

Kushandiswa kwe antioxidants mune coatings

1. Inoshandiswa mu alkyd, polyester, unsaturated polyester
Mumafuta ane zvikamu zve alkyd, pane zvisungo zviviri kune zviyero zvakasiyana. Single double bonds, multiple double bond, uye conjugated double bonds zvinonyoreswa oxidized kuita peroxides pakupisa kwepamusoro, zvichiita kuti ruvara ruve nerima, ukuwo antioxidants inogona kuora hydroperoxides kujekesa ruvara.

2. Inoshandiswa mukugadzirwa kwePU kurapa mumiririri
PU kurapa mumiririri kazhinji inoreva iyo prepolymer ye trimethylolpropane (TMP) uye toluene diisocyanate (TDI). Kana iyo resin inoratidzwa nekupisa uye chiedza panguva yekubatanidza, urethane inoora kuita maamines uye olefins uye inotyora cheni. Kana iyo amine ichinhuhwirira, inoiswa oxidized kuti ive quinone chromophore.

3. Kushandisa mu thermosetting powder coatings
Iyo yakasanganiswa antioxidant ye-high-efficiency phosphite uye phenolic antioxidants, yakakodzera kuchengetedza poda yekuputira kubva kune inopisa oxidative degradation panguva yekugadzirisa, kuporesa, kupisa uye mamwe maitiro. Zvishandiso zvinosanganisira polyester epoxy, yakavharika isocyanate TGIC, TGIC inotsiva, mutsara epoxy komisheni uye thermosetting acrylic resins.

Nanjing Reborn New Materials inopa marudzi akasiyana eantioxidantszvepurasitiki, zvekupotera, maindasitiri erabha.

Nekuvandudzwa uye kufambira mberi kweindasitiri yekupfekedza, kukosha kwema antioxidants ekupfekedza kuchave kuri pachena, uye nzvimbo yekusimudzira ichave yakakura. Mune ramangwana, ma antioxidants anozokura munzira yeakakwira mamorekuru mashoma, multifunctionality, kugona kwakanyanya, hutsva, kuumbwa, kuterera uye girinhi kuchengetedzwa kwezvakatipoteredza. Izvi zvinoda kuti varapi vaite tsvakiridzo yakadzama kubva kune ese mashini uye maficha ekushandisa kuti varambe vachizvivandudza, kuita tsvakiridzo yakadzama pamusoro pemaitiro eiyo antioxidants, uyezve kugadzira matsva uye anoshanda antioxidants anoenderana neizvi, izvo zvichave nemhedzisiro yakakura pakugadzirisa nekushandiswa kweindastiri yekupfeka. MaAntioxidants ekuputira anowedzera kushandisa kugona kwawo kukuru uye kuunza zvakanakisa zvehupfumi uye tekinoroji mabhenefiti.