TPE coated PA6. PA66 raw materials
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, 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, suitable envelope 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, should pay attention to the mold flow and the design of the adhesive mouth.
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 pre-hot 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 pieces for grooves, fine holes, coating 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.
6, TPE, TPR material selection, the application of TPE, TPR soft adhesive material and common application TPE, TPR material in the formula is somewhat different, especially TPE, TPR coated ABS material. And TPE, TPR coated PP and coated ABS ingredients are not the same formula. Therefore, the selection of TPE and TPR materials will directly affect the adhesion of TPE and PP, ABS, PS, and PA. A lot of customers were taking their goods from some traders when they first looked for TPE. Because many traders do not know much about the nature of the material users, their recommended materials often do not achieve the desired results. Therefore, it is recommended that users choose TPE manufacturers as much as possible when purchasing TPE materials, especially those with large scale and older R&D qualifications, in order to obtain complete product technical support and quality after-sales service from suppliers.
Dongguan Dechuang Chemical Co. Ltd. focuses on food-grade TPE prices, imitation silica gel TPE, fire retardant TPE, TPE packaging glue, TPE adhesive PA, TPE adhesive PA6, TPE adhesive PA66 and other raw materials!
