Author: Chia-Shing Wu PhD
Common inert plastic materials (IPM) are polypropylene (PP), polyethylene (PE), polyamide (commonly known as nylon, PA), and so on, are widely used in various fields. However, bonding IPM is very difficult because of their low surface energy (LSE) and/or their limited wettability. Moreover, the high temperature of the used environment usually leads to failure of the adhesion. Therefore, we have recently successfully developed a new type of acrylic adhesive (brand name: KA006 AB) that can be cured at room temperature after mixing the A and B components together with a ratio of 10/1(A/B). KA006 adhesive can reveal strong adhesion on common inert plastics without special surface treatment, even the high adhesive strength still maintained as high as non-thermally treated for a long-term high-temperature environment.
Fig. 1 shows the adhesion- and joint-states for KA006 to the PP substrate before and after thermally treated. No obvious failure exhibited after heating at high-temperature 80 oC for 14 days. The PP test pieces were tested for shear strength shown in Fig. 2. The results showed that the PP substrate was stretched to become whitening, but the adhesive area was not damaged at all. This result proves that the adhesive strength of KA006 to PP substrate exceeds the material strength of PP itself. Fig. 3 shows the adhesion tests of KA006 at high-temperature for different days, their corresponding shear strength was maintained the same compared to that one before heating, implying that KA006 can withstand an ambient temperature of 80 oC for high temperature applied environment. In addition, KA006 can also be applied to most inert materials TPO and heterogeneous plastic substrates without surface pre-treatment or “Primer” coating. Fig. 4 shows the shear strength of KA006 on various substrates, such as PP (43 kgf/cm2), PS (48 kgf/cm2), ABS (60 kgf/cm2), PET (66 kgf/cm2), PMMA (70 kgf/cm2), PVC (72 kgf/cm2), and PC (72 kgf/cm2), respectively.
We are trying this kind of adhesive for various customer requirements, and you are welcome to contact us if you are interested.
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