Ni-P-PTFE複合層化學鍍製備與其抗沾黏特性之研究

Excellent hardness(＞600HV), abrasion and chemical corrosion resistance has a wide range of applications in areas such as machinery、molds、photo electronics and electronics manufacturing. Poly-tera-fluoro-ethylene also has its excellent self-lubricity、surface anti-sticky、super hydrophobic self-cleaning、corrosion resistance、insulation resistance, has been widely used in biochemical、medical、and food-related utensils. The mold caused by the type of mold surface, such as deposition of thin film of PTFE has excellent stripping and releasing effect, to avoid embossing or injection molding of the polymer material sticking in the mold surface, especially when micro / nano-level structure of the molding, this adhesion phenomenon is particularly easy to occur. However, this PTFE film coating on the surface of the mold generally based on the method of vapor deposition、spin coating 、spraying、dipping, etc, is easily generate the phenomenon of peeled off in the process of stripping from the mold which result in poor durability. So it must propose another effective solutions. Therefore, Therefore, in this research, the procedures for the chemical plating of Ni-P alloy, we add 0.2 μm PTFE particles in order to prepare the Ni-P-PTFE composite layer. This complex layer has both the superior hardness、wear resistance and low coefficient of friction、super water-repellent、high anti-sticking properties of the PTFE membrane. In addition, due to the PTFE particles uniformly embedded in a nickel-phosphorus alloy plating in internal part and outer surface, the particles have the characteristics of not easy to fall off, it can significantly improve the disadvantage of PTFE coated on the surface of the mold, caused by the poor durability of the mold. In electroless plating experiments, we control the parameters of pH value、the operating temperature、the amount of the PTFE particles are added、surfactant FC-134 concentration to investigate the plating rate of Ni-P-PTFE composite layer、the deposition amount of the PTFE composite layer、the impact of micro-hardness and contact angle characteristics associated with anti-adhesion、self-cleaning、anti-fouling features. The experimental results show that the pH value of the plating bath must be controlled within the 4.80-4.92 ranges, in order to maintain the stability. The plating film can has a good contact angle by elevating the bath temperature, but with the increase in the bath temperature, the plating rate instead will be reduced, for example, the contact angle of the coating film is 1l3.47° at 85 ℃ operating conditions, the plating rate is 15.8 μm /hr ; the contact angle of the coating film is 146.29° at 95 °C, the plating rate is 5.7 μm/hr. Plating time and deposition thickness shows the linear relationship, the longer time may have a thicker film, but the PTFE content in the bath of more than 7.5 cc/L, the deposition rate is limited and slow. The suspension of PTFE of Du Pont Company (Du Pont), its coating quality is deeply influence by the surfactant FC-134, and the optimum conditions is 95 ℃ bath containing 300 μmole / L FC-134、PTFE content 7.5 cc/L、plating 20 min, the contact angle 140.01° is get, coating thickness is 6.5 μm, the average hardness is 173.54 Hv. By using the PTFE suspension of World Metal Co., Japan, Ltd, the bath does not use the FC-134, under the optimum conditions of 95 ℃ bath、the PTFE content of 7.5 cc/L、plating 20 min, the contact angle can be 147.70°, thickness of the coating film is 5.5 μm、the average hardness of 160.80 HV. The current research get the super hydrophobic Ni-P-PTFE composite layer and is preparing the plating in the microstructure of Ni-Co mold surface, contact angle 141.42° is get and test of hot embossing after lamination and stripping experiments, contact angle 137.89° is get. Therefore, the institute of Ni-P-PTFE composite layer anti-adhesion ability can help the Ni-Co mold from the type of effect.