摘要
研究了用臭氧氧化法对聚丙烯表面进行涂装性改良时,丙烯均聚物、乙烯—丙烯嵌段共聚物及无规共聚物表面上含氧官能团相对生成量和涂膜剥离强度之间的关系。结果表明,当各种聚丙烯表面上以FT-IR中1710cm^(-1)和973cm^(-1)峰的吸光度比(log(I_0/I)_(1710)/log(I_0/I)_(973))所表示的COOH基的相对生成量在0.6附近时,可反应性涂料的涂膜剥离强度均出现最大值。这是因为在涂膜剥离过程中存在着接着破坏和凝集破坏两种机理,在最大值及最大值之前的剥离破坏属于接着破坏,此时剥离强度随聚丙烯表面上COOH相对量的增加而增加;而最大值以后的剥离破坏属于凝集破坏,此时剥离强度随COOH相对量的增加而下降。
This paper has studied the relationship between the peeling strength and the relative amount of oxygen - containing groups produced on the surfaces of propylene homopolymer, ethylene - propylene block copolymer and random copolymer when ozonization was used to improve the coating properties of PP surface. Results showed that the peeling strength of the coating layer made from reactive paints invariably reached its maximum when the relative amount of COOH groups represented by the FT-IR adsorption ratio loh (I0/I)1710/log (I0/I)973 was around 0.6. The reason was that there existed two kinds of mechanisms, i. e., adhesive destruction and cohesive destruction, during the peeling process of the coating layer. Before reaching the maximum or at the maximum, the peeling destruction was adhesive one, and the peeling strength increased with the relative amount of the COOH groups on the surface of PP. After the maximum, the destruction was cohesive one, so the peeling strength decreased with the relative amount of COOH groups.
出处
《合成树脂及塑料》
CAS
1997年第2期12-15,共4页
China Synthetic Resin and Plastics
关键词
聚丙烯
臭氧氧化
涂装
剥离强度
改性
涂膜
polypropylene
ozonition
coating
oxygen -containing group
peeling strength
