推荐回答(1个)
按照主要组分分类
可把结构胶粘剂分为环氧树脂胶、丙烯酸酯胶、厌氧胶和有机硅胶等。按胶粘剂的供应状态分为液态胶、糊状胶、带状胶、粉状胶和膜状胶等。
按强度分类
按不同的强度,I型又分为三级,规定如下:一级用于主受力结构的粘接,为结构胶粘剂;二级用于次受力结构的粘接,为准结构胶粘剂;三级对剥离强度没有要求,应属于非结构胶粘剂。我国对结构胶粘剂的定义和分类还没有国家标准,通常根据粘接受力情况和粘接强度把结构胶粘剂分为高强度、高韧性和中等强度、中等韧性两类:主受力结构用胶的钢-钢抗剪切强度为25MPa,拉伸强度为33MPa,不均匀扯离强度为40KN/m;次受力结构用胶的剪切强度为17~25MPa,不均匀扯离强度为25~50KN/m。
按照固化温度分类
如环氧结构胶粘剂可分为高温固化、中温固化、室温固化和低温固化四类:高温固化环氧结构胶粘剂的温度、韧性、耐热性等均高,多用于主受力结构的粘接;中温固化环氧结构胶粘剂主要是适应飞机工业的需要而发展起来的胶种,由于铝合金在120℃以上开始出现晶界腐蚀倾向,并随温度的升高而加剧,晶界腐蚀后铝合金的强度和韧性都会下降,因此要求粘接铝合金的胶粘剂的固化条件不超过130℃,4h;室温固化环氧结构胶粘剂的应用更为广泛,在土木建筑领域的应用更为重要,是建筑结构胶粘剂的主要品种之一;低温固化环氧胶粘剂是近几年来为了适应冬季低温施工的需要,开发出的一类新胶种,能在0℃,甚至可在-10℃以下施工、固化。通常按固化温度分类为:
1组,固化温度低于40℃
2组,固化温度为40~80℃
3组,固化温度为81~120℃
4组,固化温度为121~180℃
5组,固化温度高于180℃
按照耐热性分类
还可把结构胶粘剂分为通用型(80℃)、耐高温型(150℃)和耐中温型(介于前者之间)等类。如按使用温度分类为:
Ⅰ类,-55~80℃长期使用
Ⅱ类,-55~150℃长期使用
Ⅲ类,-55~220℃长期使用
Ⅳ类,-55~220℃长期使用或300℃短期使用
按使用性能分类
在航空航天工业中,通常按使用性能将其分类为:
(1)板-板胶
(2)面板胶
(3)芯条胶
(4)发泡胶
(5)底胶
(6)修补胶
(7)点焊胶
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