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A matsayin kayan haɗin gwiwa,unsaturated polyester guduroan yi amfani da shi sosai a cikin sutura, gilashin fiber ƙarfafa robobi, dutsen wucin gadi, aikin hannu, da sauran filayen. Duk da haka, launin rawaya na resins mara kyau ya kasance matsala ga masana'antun. A cewar masana, abubuwan da suka saba haifar da rawaya na resin unsaturated sun haɗa da:

1. A lokacin esterification kira tsari na unsaturated guduro, saboda thermal tsufa yellowing lalacewa ta hanyar high zafin jiki, da general esterification zafin jiki na unsaturated guduro ne 180 ~ 220 ° ko ma mafi girma, a wannan zafin jiki da guduro yana da sauki juya rawaya saboda. zuwa tsufa na thermal, yana shafar bayyanar samfuran guduro.

2. A yellowing lalacewa ta hanyar daukan hotuna na guduro zuwa ultraviolet haskoki ne yafi lalacewa ta hanyar kasancewar benzene zobba a cikin guduro (ciki har da aromatic dibasic acid / anhydrides da benzene zoben gabatar da styrene), wanda zai iya zama saboda thermal oxidation na aromatic. mahadi a babban yanayin zafi. Lalacewa, yana da haɗari ga sauye-sauye na lantarki, yana yin rawaya rawaya.

3. A cikin tsarin samar da resin, albarkatun kasa suna fuskantar iskar oxygen saboda rashin aikin rufewa na na'urar. Sarkar kwayoyin halittar polyester gabaɗaya ta ƙunshi ba kawai ƙungiyoyin ester, ƙungiyoyin meridian, da ƙungiyoyin tururuwa ba, har ma da shaidu biyu da zoben kamshi. Yana jurewa thermal oxidative degeneration, kuma a fili aikin shine cewa launi na guduro ya juya rawaya.

4. Tasirin additives irin su antioxidants, polymerization inhibitors, curing agents, da dai sauransu. Amine antioxidants suna sauƙin canzawa zuwa nitroxide free radicals don canza launin samfurin. Masu hana polymerization da aka saba amfani da su, irin su hydroquinone, sune Oxidation cikin quinones a gaban quinones, waɗanda kansu suna da launi, don haka yana shafar launi na resin. Wasu masana'antun magunguna har yanzu suna amfani da tsarin acyl peroxide-tertiary amine da tsarin sabulun ƙarfe na ketone peroxide. Guduro mai launi, mai sauƙin launi.

Tabbas, akwai wasu dalilai da ke sa guduro ya zama rawaya. Gabaɗaya magana, iskar oxygen da hasken ultraviolet sune manyan dalilan rawaya. Ana amfani da cikakken dibasic acid (ko acid anhydride) maimakon aromatic dibasic acid (ko acid anhydride), ko da yake ana iya amfani da shi zuwa wani yanki na musamman, ana iya sanya launin guduro mai sauƙi, amma idan aka yi la'akari da abubuwa daban-daban kamar aikin guduro farashi, wannan hanya ba ta dace ba.

A cewar masana, baya ga cika iskar gas a cikin samarwa da tsarin ajiya don hana hulɗa da iskar oxygen gwargwadon yuwuwar, hanyar da ta fi dacewa ita ce ƙara antioxidants da ultraviolet absorbers, waɗanda za su iya hana rawaya ta polyester da ke da baya yadda ya kamata. Maganganun rigakafin rawaya-shawarar ƙwararru don resin da ba su cika ba sune:

An zaɓi Antioxidants waɗanda ba su ƙunshi amines ba, kuma ana amfani da antioxidants na farko da na ƙarin a hade. Babban antioxidants yawanci suna hana phenols, wanda zai iya kama peroxides free radicals; da karin antioxidants ne phosphites, wanda Yayin da bazuwar hydroperoxide, shi kuma iya chelate karfe ions don hana guduro daga oxidative discoloration. Idan kuna son ƙara haɓaka juriya na rawaya da juriya na yanayi, ana bada shawarar ƙara mai ɗaukar UV. Ƙara abin sha na UV zai iya hana abin da ya faru na yellowing na kayan polymer a ƙarƙashin aikin haskoki na ultraviolet, kuma yana ba da kariya mai kyau ga samfurin, yana hana rage yawan sheki, haɓakar fasa, kumfa, da delamination na iya inganta yanayin juriya. na samfurin, kuma yana da sakamako mai kyau na synergistic lokacin amfani da shi tare da antioxidants. Tabbas, yin amfani da maganin antioxidants da masu ɗaukar UV ba zai iya magance matsalar rawaya ta asali ba, amma a cikin wani takamaiman kewayon, har yanzu yana iya hana oxidative yellowing na samfuran polyester unsaturated, kiyaye launin ruwan samfurin a bayyane, da haɓaka ingancin samfurin. daraja.

Muunsaturated polyester resinsana samun su ta nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan) ana samun su da kuma nau'ikan resins da ba ruwan rawaya kamar haka:

Muna kuma samarwafiberglass kai tsaye roving,gilashin fiberglass, gilashin fiberglass, kumafiberglass saƙa roving.

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