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公开(公告)号：US4264671A
公开(公告)日：1981-04-28
申请号：US930262
申请日：1978-08-02
CPC分类号： C08J5/24 , C08G8/10 , C08L61/06 , C08J2361/06 , Y10S428/921 , Y10T428/24994 , Y10T428/24995 , Y10T428/31627 , Y10T442/67
摘要： Low-color or white, dilutable condensation products of formaldehyde and phenol in molar ratios of 1.9-5.0:1, characterized by carbon-13 nuclear magnetic resonance spectra as having at least about 30 molar percent of the total formaldehyde content of the resin bound to phenol nuclei in benzyl formal groups of the form Ph--(CH.sub.2 O).sub.n --CH.sub.2 OH wherein n.gtoreq.1, and less than about 40 molar percent of the total formaldehyde content of the resin bound to phenol nuclei in methylol groups of the form Ph--CH.sub.2 OH, wherein Ph is a phenol nucleus. Phenol, water and an alkaline catalyst, limited to 0.5-2.2 moles of catalyst per 100 moles of phenol and preferably lithium carbonate, are mixed with formaldehyde at 1.9-5.0 formaldehyde to phenol ratios. The reaction mixture is heated at a uniform rate over 1 hour to reflux temperature and refluxed until a viscosity of 400-500 centipoise at 50-75% solids is attained. The mixture is cooled to 50.degree. C. and neutralized with acid to a pH of 3-7, preferably with citric acid. The resulting resin may be employed, without solvent dilution, to make resin-fiberglass laminates that have strengths comparable to polyester or epoxy laminates. The laminates have exceptional fire resistance and low smoke evolution when exposed to flame.
摘要翻译： 低分子或白色可稀释的甲醛和苯酚的缩合产物的摩尔比为1.9-5.0:1，其特征在于碳-13核磁共振谱具有至少约30摩尔％的树脂的总甲醛含量， 形式为Ph-（CH 2 O）n-CH 2 OH的苯甲醛形式的苯酚核，其中n> / = 1，小于约40摩尔％的结合于苯酚核的树脂的总甲醛含量为Ph -CH 2 OH，其中Ph是酚核。 苯酚，水和碱性催化剂，每100摩尔苯酚，优选碳酸锂限制为0.5-2.2摩尔催化剂，与甲醛以1.9-5.0甲醛与苯酚的比例混合。 将反应混合物在1小时内以均匀速率加热至回流温度并回流至达到50-75％固体的粘度为400-500厘泊。 将混合物冷却至50℃，用酸中和至pH为3-7，优选用柠檬酸。 所得到的树脂可以在没有溶剂稀释的情况下用于制备具有与聚酯或环氧层压材料相当的强度的树脂 - 玻璃纤维层压板。 层压板具有特殊的耐火性和暴露于火焰时的低烟雾释放。
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