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首页> 外文期刊>Journal of Applied Polymer Science >Reducing the contents of free phenol and formaldehyde in phenolic foam
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Reducing the contents of free phenol and formaldehyde in phenolic foam

机译：减少酚醛泡沫中游离酚和甲醛的含量

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The problem of overly high contents of remnant monomers (free phenol and free formaldehyde) in phenolic foam was studied. Free phenol was characterized by iodimetry, and free formaldehyde was characterized by a hydroxylamine hydrochloride method. The effect of the phenol /formaldehyde molar ratios and the reaction temperature on the contents of the remnant monomers was examined. The effect of adding urea on the content of free formaldehyde was investigated. The effect of the foaming process on the contents of the remnant monomers was examined in detail. Phenolic foams in which the content of free phenol was 0.09% and the content of free formaldehyde was less than 0.1% were successfully prepared. A prepolymer of polyurethane, which toughened the phenolic foam, lowered the contents of free phenol and free formaldehyde. (C) 2003 Wiley Periodicals, Inc. [References: 10]
机译：研究了酚醛泡沫中残余单体（游离酚和游离甲醛）含量过高的问题。用碘量法表征游离酚，用盐酸羟胺法表征游离甲醛。研究了苯酚/甲醛摩尔比和反应温度对残余单体含量的影响。研究了添加尿素对游离甲醛含量的影响。详细研究了发泡过程对残余单体含量的影响。成功制备了游离酚含量为0.09％，游离甲醛含量低于0.1％的酚醛泡沫。聚氨酯的预聚物可以使酚醛泡沫增韧，从而降低了游离酚和游离甲醛的含量。 （C）2003 Wiley Periodicals，Inc. [参考：10]

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