Thermoplastic Polyurethane (TPU) Metalization Solution

Breaking down the cognitive barrier that 'plastic cannot be coated with metal'

In cutting-edge fields such as flexible electronics, smart wearables, automotive lightweighting, and healthcare,Thermoplastic polyurethane (TPU)With its excellent elasticity, wear resistance, and biocompatibility, it has become an irreplaceable core substrate. However, many clients encounter the same problem during project development: "Can TPU be coated with metal? Can we create a metallic effect? ”The answer is - yes, but not traditional 'electroplating'.

�� Non-conductive material

TPU itself is non-conductive and cannot be used as a cathode for electroplating.

�� Low temperature resistance

Polyester TPU has a temperature resistance of less than 150 ° C, while polyether TPU has a lower upper limit (about 80-100 ° C). Traditional electroplating solutions require 80-90 ° C, which can easily lead to thermal degradation.

�� Chemical sensitivity

Strong acid/alkaline electroplating solution can corrode TPU molecular chains, and the current action exacerbates the degradation risk.

�� Low surface energy

The surface energy of TPU is only 30-40 mN/m, and the adhesion of the metal layer is extremely poor. Direct plating will inevitably peel off.

�� Option 1: Vacuum coated metal film (recommended high-end route)

After our professional corona/plasma/chemical activation pretreatment, the TPU surface can be vacuum evaporated with the following metal thin layers (usually<100 nm in thickness):

�� Advanced Institute Technology Process Control: The vacuum coating temperature is strictly<80 ° C to ensure zero damage to the TPU substrate.

�� Option 2: Metal Ink/Coating Coating (High Cost Effective Route)

Developed specifically for this purposeTPU based metal ink(including aluminum powder/copper powder/stainless steel powder/silver nanoparticles), metalization effect is achieved through screen printing, spraying, roller coating and other processes:

⚡ Key technology: Equipped with isocyanate based primer and silane coupling agent treatment, the adhesion can reach over 4B in the hundred grid test, far exceeding the performance of ordinary metal paint on TPU.

�� Option 3: TPU composite metal foil (preferred for industrial mass production)

For large-scale production scenarios, we recommendHot pressing composite processTPU film aluminum foil/copper foil → hot pressing bonding. Balancing metal properties and TPU flexibility, with low cost, high efficiency, and stable yield.

��️ process temperature- Full process control<100 ° C, preferably polyether TPU (stronger hydrolysis resistance)

�� Surface Treatment- It must be activated by corona/plasma/chemical primer, otherwise the metal layer will fall off

��️ Outdoor use- Al is easy to passivate but still acceptable; Ag is prone to sulfurization and blackening, requiring the addition of a protective layer

�� Ink Selection- Ordinary metal paint ≠ TPU special ink, with varying degrees of adhesion

�� Substrate selection- Wet and hot environment → Choose polyether TPU; High temperature environment → Choose polyester TPU (slightly higher temperature resistance)

�� one-sentence summary

TPU cannot be "metalized" - it requires the right method to be used.
Advanced Institute (Shenzhen) Technology Co., Ltd. allows your TPU products to combine flexibility and metal functionality.

�� Consult now:duanlian@xianjinyuan.cn

�� Technical Hotline:13826586185(Mr. Duan)