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Nilai hidroksil (setara hidroksil): Nilai hidroksil berarti jumlah mol gugus hidroksil yang terkandung dalam 100 g resin epoksi. Relat hidroksil mengacu pada massa resin epoksi yang mengandung 1mol hidroksil gram. Penentuan hidroksil dua cara: Pertama, penentuan langsung kandungan hidroksil dalam resin epoksi; Yang kedua adalah membuka kelompok epoksi untuk membentuk gugus hidroksil, dan penentuan lebih lanjut dari jumlah kandungan hidroksil. Metode terdahulu didasarkan pada litium aluminium hidrida dan gugus yang mengandung hidrogen aktif untuk prinsip reaksi cepat dan kuantitatif, untuk penentuan langsung resin epoksi hidroksil, adalah metode yang lebih dapat diandalkan. Metode yang terakhir adalah anhidrida asetat, piridin dan campuran asam sulfat pekat dari reagen asetilasi dan reaksi resin epoksi untuk membentuk gugus hidroksil, dan kemudian menentukan kadar hidroksil total, dan kemudian melipatgandakan penurunan epoksi, Anda dapat mengukur cincin Kandungan hidroksil dalam Resin oksigen adalah bilangan hidroksil. (3) Esterifikasi setara: Esterifikasi setara mengacu pada gram massa resin epoksi yang dibutuhkan untuk esterifikasi 1 mol asam monokarboksilat (60 g asam asetat atau 280 g asam lemak C18). Epoxy hydroxyl dan epoxy groups dapat diesterifikasi dengan asam karboksilat. Esterifikasi setara dapat mewakili kandungan total gugus hidroksil dan epoksi dalam resin.
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25 May : 04:28

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28 Apr : 22:57

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11 Apr : 17:46

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08 Apr : 12:45

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07 Mar : 07:43

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07 Mar : 05:57

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07 Mar : 04:30

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05 Mar : 09:07

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10 Feb : 19:15

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27 Nov : 04:45

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