TPE adhesive PA material bad viscosity improvement scheme
Source：德創化工Time：2019-06-17Hits：3287
As a professional TPE material salesman, I have compiled some key points on TPE coated PA material, which helps TPE coated PA material viscosity. Let TPE pack glue PA nylon material no more headache! If this article helps you, it's my pleasure! I will organize and share more information and technical support on TPE raw materials on this website, please continue to pay attention to your favorite friends!
TPE coated nylon PA, to bond very strong, this is difficult in the industry. To improve the problem of poor adhesion, we need to start with the following aspects:
1. TPE material aspects
The polarity of the TPE mixing system needs to be improved(currently more use of grafting agents to achieve), so that the polarity is close to PA, so as to facilitate adhesion. It is said that the TPU of some production models is good with PA, but the hardness is limited, and the TPU hardness is usually above 70A. If you need a less rigid TPE, you still need to solve the problem by improving the polarity of the SEBS system.
2. TPE suitable coating molding temperature.
TPE's coating forming temperature needs to be high enough to form a certain degree of fusion on the nylon coating surface. The adhesion will be greatly improved. If the forming temperature is low, it will be unfavorable for bonding.
3. TPE should pay attention to the design of the mold flow channel and the inlet.
For products that cover large areas and many locations, open as many as possible to reduce the melt time in the mold. The longer the running time and the running rubber path, the lower the melt temperature of the glue, which is unfavorable to the bonding. The key to glue is:(hot) quickly coated adhesive.
4. Nylon parts preheated baking.
For the use of ordinary plastic mold secondary injection molding, instead of two-color machine composite molding, it is recommended to Preheat or bake nylon pieces first, baking time of about 1 to 2 hours, baking temperature of 120 ~ 130 °C. This provides more energy for the adhesion of TPE to nylon, which facilitates the coating.
5. Nylon parts for grooves, fine holes, coated surface for grinding and other treatment.
It will be beneficial for the combination of TPE and nylon. But this is achieved by physical mechanical force, not chemical bonding.
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