Zeziphi izinto ezichaphazela ukufiphala kweIimveliso ze-EVA? Ndiyakholelwa ukuba abantu abaninzi bakhathazeke kakhulu ngeengxaki ezinjalo ngeemveliso ze-EVA. Ngapha koko, i-EVA ibonakala kubomi basekhaya njengeyona nto iphambili ngoku. Ihlala isebenza njengesixhobo sokugquma isandi, izinto zomgangatho, izinto zokuthambisa, njl njl kwiiprojekthi zokuhlobisa. Izinto ze-EVA zineenzuzo ezininzi njengekhaphethi, ezifana nokumelana nokuzamazama komhlaba, ukungangeni kwamanzi, ukuchasana nombane, njl.
Izinto ezichaphazela ukuphela kweemveliso ze-EVA zeplastiki. Ukuphela kweemveliso ezinemibala yeplastiki kuhambelana nokumelana nokukhanya, ukumelana neoksijini, ukumelana nobushushu, ukuxhathisa kwe-asidi kunye ne-alkali yemibala kunye nedayi, kunye neempawu ze-resin esetyenzisiweyo. Ngokwemiqathango yokucubungula kunye neemfuno zokusetyenziswa kweemveliso zeplastiki, iimpawu ezikhankanywe ngasentla zee-pigments ezifunekayo, idayi, i-surfactants, i-dispersants, i-resins ye-carrier carrier kunye ne-additives anti-aging kufuneka ihlolwe ngokubanzi xa ivelisa i-masterbatches ngaphambi kokuba ikhethwe.
Izizathu ezine eziphambili zokuphela kweemveliso ze-EVA:
1. Ukunganyangeki kwe-Acid kunye ne-alkali Ukuphela kweemveliso zeplastiki ezinemibala kuhambelana nokumelana nemichiza yombala (ukumelana ne-asidi kunye ne-alkali, i-oxidation kunye nokunciphisa ukuxhathisa)
Umzekelo, i-molybdenum chrome ebomvu iyaxhathisa kwi-asidi edibeneyo, kodwa ivakalelwa kwi-alkali, kunye ne-cadmium etyheli ayinakumelana ne-asidi. Ezi pigments zimbini kunye ne-phenolic resin zinefuthe elinamandla lokunciphisa kwezinye ii-colorants, ezichaphazela kakhulu ukuxhathisa ubushushu kunye nokumelana nemozulu yombala kwaye kubangela ukubuna.
2. Iimpawu ze-Antioxidant Ezinye ii-pigments eziphilayo ziphela ngokuthe ngcembe emva kwe-oxidation ngenxa ye-macromolecular degradation okanye olunye utshintsho.
Le nkqubo yi-oxidation yobushushu obuphezulu ngexesha lokucubungula kunye ne-oxidation xa udibana nee-oxidants ezinamandla (ezifana ne-chromate kwi-chrome yellow). Emva kwechibi lombala, i-azo pigment kunye ne-chromium yellow zixutywe, umbala obomvu uya kuncipha ngokuthe ngcembe.
3. Uzinzo lwe-thermal ye-pigment enganyangekiyo kubushushu ibhekisa kwiqondo lokuncipha kobunzima bobushushu, ukujika kombala kunye nokuncipha kwebala kwiqondo lobushushu bokusebenza.
I-pigments ye-Inorganic yenziwe ngee-oxide zetsimbi kunye neetyuwa, ngokuzinza okulungileyo kwe-thermal kunye nokumelana nokushisa okuphezulu. Nangona kunjalo, ii-pigments ze-organic compounds ziya kutshintsha kwi-molecular structure kunye nexabiso elincinci lokubola kwiqondo lokushisa elithile. Ngokukodwa kwi-PP, PA, kunye neemveliso ze-PET, ubushushu bokusebenza bungaphezulu kwe-280 ℃. Xa ukhetha i-colorants, kwelinye icala, kufuneka sinikele ingqalelo ekuxhathiseni ubushushu be-pigment, kwaye kwelinye icala, kufuneka siqwalasele ixesha lokumelana nobushushu be-pigment, edla ngokufuneka ukuba ibe yi-4-10imvula.
4. Ukumelana nokukhanya Ukukhanya kokukhanya kombala kuchaphazela ngokuthe ngqo ukubola kwemveliso
Kwiimveliso zangaphandle ezivezwe ekukhanyeni okunamandla, ukuchasana nokukhanya (ukuchasana nelanga) imfuno yenqanaba lombala osetyenzisiweyo luphawu olubalulekileyo. Ukuba umgangatho wokumelana nokukhanya umpofu, imveliso iya kuphelelwa ngokukhawuleza ngexesha lokusetyenziswa. Umgangatho wokumelana nokukhanya okhethiweyo kwiimveliso ezichasene nemozulu akufanele ube ngaphantsi kwenqanaba lesi-6, ngokukhethekileyo inqanaba lesi-7 okanye lesi-8, kunye nenqanaba lesi-4 okanye lesi-5 kwiimveliso zangaphakathi. Ukumelana nokukhanya kwe-resin ye-carrier carrier kunempembelelo enkulu ekutshintsheni umbala. Emva kokuba i-resin ilayishwe yimisebe ye-ultraviolet, isakhiwo sayo se-molecular siyatshintsha kwaye siphele. Ukongeza i-stabilizers yokukhanya efana ne-ultraviolet absorbers kwi-masterbatch inokuphucula ukunyanzeliswa kokukhanya kombala kunye neemveliso zeplastiki ezinemibala.
Izizathu ezine eziphambili zokuphela kweemveliso ze-EVA zeplastiki kwabelwana ngazo apha. Ukunika ingqalelo kula manqaku angasentla kunokuphepha izinto ezimbi ezifana nokuphela kweemveliso ze-EVA; ngenxa yeenzuzo zezinto ze-EVA, ngoku isetyenziswa ngokubanzi kubomi bemihla ngemihla.
Ixesha lokuposa: Sep-26-2024