Iindaba-Indlela yokusombulula ingxaki yombala omthubi we-resin unsaturated

Njengemathiriyeli edibeneyo,i-polyester resin engasetyenziswangaisetyenziswe kakuhle kwizinto zokwaleka, iiplastiki zefiber zeglasi, ilitye elenziweyo, imisebenzi yezandla, kunye namanye amacandelo. Nangona kunjalo, umbala omthubi we-resins unsaturated uhlala uyingxaki kubavelisi. Ngokutsho kweengcali, izizathu eziqhelekileyo zokuvela kwe-yellowing resins unsaturated ziquka oku kulandelayo:

1. Ngethuba lenkqubo ye-esterification ye-resin engaxutywanga, ngenxa yokuguga kwe-thermal etyheli ebangelwa ubushushu obuphezulu, iqondo lokushisa eliqhelekileyo le-esterification ye-resin engaxutywanga yi-180 ~ 220 ° okanye nangaphezulu, kulo bushushu i-resin kulula ukujika ngenxa ye-resin. ukuguga kwe-thermal, echaphazela ukubonakala kweemveliso ze-resin.

2. Ubutyheli obubangelwa kukuvezwa kweresin kwimitha ye-ultraviolet ikakhulu kubangelwa kubukho be-benzene rings kwi-resin (kubandakanya i-aromatics dibasic acids/anhydrides kunye neringi zebenzene eziveliswe yi-styrene), enokuba kungenxa ye-thermal oxidation ye-aromatics. iikhompawundi kumaqondo obushushu aphezulu. Ukuthotywa, kuxhomekeke kwiinguqu ze-elektroniki, okwenza i-resin ibe tyheli.

3. Kwinkqubo yokuveliswa kwe-resin, izinto eziluhlaza zibonakaliswe kwi-oksijini ngenxa yokusebenza kakubi kokutywinwa kwesixhobo. Itsheyini yemolekyuli ye-polyester engaxutywanga ngokubanzi ayiqulathanga kuphela amaqela e-ester, amaqela e-meridian, kunye namaqela e-antelope, kodwa kunye neebhondi eziphindwe kabini kunye namakhonkco amnandi. Ifumana ukuthotywa kwe-thermal oxidative, kwaye ukusebenza okucacileyo kukuba umbala we-resin ujika ube tyheli.

4. Impembelelo yezongezo ezifana ne-antioxidants, i-polymerization inhibitors, i-ejenti yokunyanga, njl. I-Amine antioxidants iguqulwa ngokulula ibe yi-nitroxide free radicals ukuze ifake umbala kwimveliso. I-polymerization inhibitors esetyenziswa ngokuqhelekileyo, njenge-hydroquinone, i-Oxidation ibe yi-quinones phambi kwee-quinones, yona ngokwayo inombala, ngoko ichaphazela umbala we-resin. Abanye abavelisi beearhente zokunyanga basasebenzisa iisistim ze-acyl peroxide-tertiary amine kunye neenkqubo zesepha yesinyithi ye-ketone peroxide. I-resin enemibala, kulula ukuyifaka umbala.

Ewe kunjalo, kukho ezinye izizathu ezibangela ukuba i-resin ijike ibe tyheli. Ngokuqhelekileyo, i-oxygen eshushu kunye nemitha ye-ultraviolet zezona zizathu ze-yellowing. I-saturated dibasic acid (okanye i-acid anhydride) isetyenziselwa endaweni ye-aromatic dibasic acid (okanye i-acid anhydride), nangona ingasetyenziselwa kwinqanaba elithile, umbala we-resin unokwenziwa ube khaphukhaphu, kodwa ngokuqwalasela izinto ezahlukeneyo ezifana nokusebenza kwe-resin ixabiso, le ndlela ayifanelekanga.

Ngokutsho kweengcali, ngaphezu kokuzalisa igesi ye-inert kwimveliso kunye nenkqubo yokugcina ukukhusela ukudibanisa ne-oksijini kangangoko kunokwenzeka, indlela esebenzayo ngakumbi yokongeza i-antioxidants kunye ne-absorber ultraviolet, enokuthintela ngokufanelekileyo i-yellowing ye-polyester ephelelwe yisikhathi. Izisombululo ezichasene nomthubi ezicetyiswa yingcaphephe kwireyithi ezingaxutywanga zezi:

Ama-Antioxidants angenayo i-amines akhethiwe, kwaye i-antioxidants ephambili kunye neyokuncedisayo isetyenziswa ngokudibeneyo. Ii-antioxidants eziphambili zihlala zithintele i-phenols, ezinokubamba i-peroxide yamahhala; Ii-antioxidants ezincedisayo ziiphosphites, ezithi Ngelixa i-hydroperoxide ibola, inokuphinda itshise ii-ion zetsimbi ukukhusela i-resin kwi-oxidative discoloration. Ukuba ufuna ukuqhubela phambili ukuphucula ukuchasana kwe-yellowing kunye nokumelana nemozulu, kuyacetyiswa ukuba ungeze i-Absorbent ye-UV. Ukongeza i-absorber ye-UV inokuthintela ngokufanelekileyo into ephuzi ye-polymer phantsi kwesenzo semisebe ye-ultraviolet, kwaye inikeze ukhuseleko oluhle kakhulu kwimveliso, ukukhusela ngokufanelekileyo Ukunciphisa i-gloss, isizukulwana sokuqhekeka, i-bubbles, kunye ne-delamination kunokuphucula kakhulu ukuchasana kwemozulu. yemveliso, kwaye inesiphumo esihle se-synergistic xa isetyenziswa kunye ne-antioxidants. Ewe kunjalo, ukusetyenziswa kwe-antioxidants kunye ne-Absorber ye-UV ayinakuyisombulula ingxaki yokuba tyheli, kodwa kuluhlu oluthile, isenokuthi ithintele ngokufanelekileyo ukutyheli kwe-oxidative yeemveliso zepolyester ezingafakwanga, igcine imveliso ye-watercolor ibonakala, kwaye iphucule umgangatho wemveliso. ibakala.

Yethuii-polyester ezingasebenziyozifumaneka kwiimodeli ezahlukeneyo, kunye neeresini ezingenamthubi, ngolu hlobo lulandelayo: