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生產過程不同的生產工藝可以生產不同類型的均甲醛和共甲醛。均甲醛要制備均聚甲醛,首先要制備無水甲醛。主要方法是先將甲醛縮醛(二乙氧基甲烷,CH2(OC2H5)2)通過水合甲醛(甲基乙二醇,六氯環己烷(OH)2)與乙醇的反應,然后萃取甲醇與水的混合物或真空蒸餾脫水,然后通過加熱甲基醛釋放甲醛。此時,甲醛在陰離子催化下開始聚合,然后被乙酸酐封堵,得到穩定的均聚甲醛。甲醛要制造共甲醛,我們必須首先將甲醛轉化為三惡烷(尤其是1,3,5-三惡烷,也稱為多聚甲醛)。
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其它 其它 注塑 | |
性能項目 | 試驗條件[狀態] | 測試方法 | 測試數據 | |
比重 | ASTM D792 | 1.42 | g/cm3 | |
收縮率 | 流動3.18mm | ASTM D955 | 1.5-2.5 | % |
含水量 | 0.15 | % | ||
拉伸模量 | ASTM D638 | 2140 | MPa | |
抗張強度 | ASTM D638 | 62.7 | MPa | |
伸長率 | 屈服 | ASTM D638 | 10 | % |
彎曲模量 | ASTM D790 | 2620 | MPa | |
彎曲強度 | ASTM D790 | 86.9 | MPa | |
懸臂梁缺口沖擊強度 | 3.18mm | ASTM D256 | 75 | J/m |
懸臂梁無缺口沖擊強度 | 3.18mm | ASTM D4812 | 1100 | J/m |
體積電阻率 | ASTM D257 | 1.0-99 | ohms*cm |
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