什么是酚醛树脂胶粘剂?
各位知道什么是酚醛树脂胶粘剂吗?本文中回天新材就来为大家介绍酚醛树脂胶粘剂,希望对各位工程师朋友有所帮助。
酚醛树脂胶粘剂是合成树脂胶粘剂中使用最早、用量最大的品种之一,广泛地应用于建筑材料加工与建筑工程、涂料与塑料、飞机、船舶、汽车与拖拉机、航空航天及轻工业等行业。酚醛树脂胶粘剂具有粘接强度高,耐高温,耐水,耐油,价格便宜,容易生产,本身易进行改性等优点。到目前为止,在合成胶粘剂领域中,按绝对用量,酚醛树脂胶粘剂仍是最大的品种之一。尤其是改性酚醛树脂胶粘剂均占有十分重要的地位。由于酚醛树脂生产原料为酚类和醛类化合物,游离酚和醛,尤其是游离甲醛对人体和环境有害,需严格控制其含量,生产不含或极少含游离酚和游离醛的酚醛树脂。国内外已经开发了环保酚醛树脂改性产品。
酚醛树脂胶粘剂品种较多,根据合成原料不同、合成条件与性能不同及应用要求不同,分类方法也不相同,很难进行统一的分类和命名。一般可将其分为两大类:酚醛树脂胶粘剂和改性酚醛树脂胶粘剂,也可按酚醛树脂使用的固化温度不同进行分类,包括高温固化型酚醛树脂胶粘剂、中温固化酚醛树脂胶粘剂和常温固化型酚醛树脂胶粘剂。
(1)高温固化酚醛树脂胶粘剂,用强碱为催化剂,反应介质PH值>10,在130~150°C下固化;用弱碱为催化剂,反应介质PH<9,形成的初期酚醛树脂用酒精溶解,在130~150℃下固化。
(2)中温固化型酚醛树脂胶粘剂,用碱为催化剂,反应介质PH>12,在反应釜中缩聚到接近中期树脂的程度,在105~115℃下固化。
(3)常温固化型酚醛树脂胶粘剂,用强碱为催化剂,形成初期酚醛树脂,以有机溶剂溶解,在酸性条件下常温固化。
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