推荐回答(1个)
热 熔 胶 基 础 行 业 术 语
热熔胶:在熔化状态下涂布,冷却后即固化的一种以聚合物为主体的热塑
性粘合剂材料,室温下为100%的固体。
聚合物:如橡胶、塑料、纤维等具有由重复单元构成的长链分子结构的
物质,亦称高分子材料。
热塑性:在加热或冷却作用下,可反复熔化和凝固的性质。反之为热固性。
压敏胶:即不干胶,表面在常温下就有粘性,受压即可粘接基材。
粘度: 流体流动性的指标,粘度高则流动性差。它与流体自身性质、温度、
浓度、剪切速度等有关。
软化点:材料在加热时变软,接近流动的温度。
粘性: 或叫初粘力,指在快速轻微压力下即可粘接其它物体的能力。
开放时间:指胶从涂布直到表面仍可以粘接基材的最大时间间隔,胶在开放时
间内才有好的粘接效果。与胶、温度、基材、涂胶量等因素有关。
固化时间:胶被压合在两基材间至形成牢固粘接的最短时间。保压时间应不
少于固化时间才可以粘接好。
耐热性:在粘接不被破坏的前提下,粘接体系可以承受的最高温度。
内聚力:材料自身强度的微观说法,近似于拉伸强度。
热稳定性:材料长期承受高温的能力。
抗老化性:指粘接体系在常温存放过程中粘接强度或粘力随时间变化的程度。
玻璃化温度:指高分子材料从橡胶态向塑料态转变的温度。每种热熔胶有特定
的玻璃化温度,低于其玻璃化温度则该热熔胶会失去韧性和粘性。
耐低温性:热熔胶在低温下仍保持良好粘接强度或粘力的能力。
转移:亦称残留,指压敏胶从基材上撕下后基材上残留的胶。
拉丝:指热熔胶从喷口喷到基材上时在热熔胶尾部出现的细丝,它与热熔胶的
性质、喷胶温度以及喷头性能有关。
热 熔 胶 的 构 成
热熔胶 人体
1、高分子聚合物 ---------------------------------------------- 骨骼
-结合剂,提供强度
-影响柔软性、粘接性、耐热性
2、增塑剂 ---------------------------------------------------- 肌肉
-提高粘接性
-改进浸润性、投锚性、降低粘度
3、稀释剂 ---------------------------------------------------- 血液
-降低粘度、改进操作性能
-蜡:调节固化速度,提高耐热性、浸润性
-油:延长开放时间,提高低温柔韧性
4、抗氧剂 --------------------------------------------------- 白细胞
-减缓热熔胶的老化变质
热 熔 胶 种 类
1、EVA型 乙烯-醋酸乙烯酯共聚物
2、TPR型 热塑性橡胶
3、APAO型 无规聚烯烃
4、PA型 聚酰胺
5、PU型 聚胺酯
6、Polyester型 聚酯
7、PE型 聚乙烯
8、其它
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