推荐回答（1个）
体系类型一:
乙烯及其共聚物
1.EVA(乙烯-醋酸乙烯共聚物)
EVA树脂是一种无臭.无毒.白色或浅黄色粉状或粒状低熔点聚合物.MI大时.分子量较小.合成的低温热熔胶黏度较低.流动性好.
优点:粘结性.柔软性.加热流动性好.
缺点:强度低.不耐热.不耐脂肪油.不能用做结构胶.
2.EEA(乙烯-丙烯酸乙酯共聚物)
做低温热熔胶基体的EEA树脂.丙烯酸乙酯的含量为23%左右.
其结构与EVA相似.但其使用温度围较宽.热稳定性好.极性低.常用于高温涂布.黏度.强度要求高的场合.且对极性和非极性底材都有很好的粘结性.
3.EAA(乙烯-丙烯酸共聚物)
EAA中含有极性大的羧基.使之对金属和非金属都有良好的粘结性.
EAA树脂的性质还与丙烯酸单体含量有关.丙烯酸含量增大时.膜的透明性.低温热封性以及低温热黏性得到改善.并且对金属的粘结性及低温热熔胶的拉伸强度得到提高.
4.EVAL(乙烯-醋酸乙烯-乙烯醇三元共聚物)
EVAL使EVA的皂化产物.为白色或浅黄色粉末或颗粒.
EVAL分子中含有羟基.改善了对许极性底材的粘结性.且对树脂的刚性.加工性.着色性都有提高.
体系类型二:
聚烯烃(PO)
1.PE(聚乙烯)
PE是无毒.耐低温.高结晶.耐化学药品.本身无黏性的物质.MI低.分子量高.耐热封强度高.胶层柔韧性以及热黏附性好.做低温热熔胶常选用的MI为2-20g/10min.因聚乙烯是非极性材料.需选用极性低的配合剂.
2.PP(聚丙烯)
根据甲基空间位置排列不同.可以有等规.间规和无规聚丙烯之分.制作低温热熔胶通常采用无规聚丙烯(APP)做基体.这样的低温热熔胶固化速度慢.耐热性不高.因此常加入低分子量的聚乙烯或结晶聚丙烯.
体系类型三:
APAO(乙烯-丙烯-1-丁烯聚合物)
APAO是一种无定型聚alpha烯烃.其与EVA相比具有更广泛的温带.优异的底材粘结性.牢固的粘结力.可以用于强度要求很高的结构胶等.由于是共聚物.因此性能覆盖范围广泛(如:粘度.软化点和硬度).并且与很多原料配伍性好.
体系类型四:
聚酯(PES)
聚酯分不饱和聚酯和热可塑性聚酯两类.作为低温热熔胶.需用热可塑性聚酯.即线性饱和聚酯作为基料.它是由二元酸和二元醇或醇酸缩聚而成的.热塑性聚酯的熔点和玻璃化温度较高.所制得的低温热熔胶耐热性好.聚酯型低温热熔胶是以共聚物单独使用.一般无需加入其他成分.
体系类型五:
聚氨酯(PU)
聚氨酯为白色无规则球状或柱状颗粒.分为聚酯型和聚醚型两大类.常用聚酯多元醇与二异氰酸酯聚合.聚氨酯最突出的特点是耐磨性优异.硬度大.强度高.弹性好.耐低温.聚氨酯反应型低温热熔胶可分为热熔固化型和热熔加热反应型.
体系类型六:
聚酰胺(PA)
聚酰胺低温热熔胶具有较强的粘结强度.且分子量越大强度.黏度都有提高.但熔点却变化不大.聚酰胺可分为两类:一是二聚酸类(分子量高.熔融黏度高.软化点高.强度高.但低温热熔胶的工艺性下降),一是尼龙型(为了使用方便常用甲醛处理制成羟甲基化尼龙)
体系类型七:
苯乙烯及其嵌段共聚物
此类共聚物的特点是:没有硫化却有硫化橡胶的特性.蠕变性良好.与各种掺和材料都能相容.但其耐温性能.耐紫外光照射性能和耐烃化合物类溶剂性能较差.
其包括:SBS(苯乙烯-丁二烯-苯乙烯嵌段共聚物).SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物）
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