石墨烯镀层辅助快速热循环注射成型方法的研究

Study on Rapidly Thermal Cycle Injection Molding Using Carbide-bonded Graphene Coating

提出了一种以石墨烯纳米镀层辅助实现快速热循环注射成型的新方法,采用化学气相沉积工艺在模具型腔表面制备连续且致密的化学键合石墨烯镀层,仅需低压电源驱动就能将型腔表面温度迅速提升至聚合物材料玻璃化转变温度(T_g)之上并进行实时调控,型腔表面温度分布均匀且具有较高的降温速率,可满足注射成型快变模温调控的要求。结果表明,利用石墨烯镀层快速热循环注射成型方法可有效改善注射成型熔体流动行为,明显消除制品的熔接痕。

A novel dynamic mold temperature control strategy was proposed for injection molding using carbide-bonded graphene coating in this paper. A chemical vapor deposition process was employed to prepare the continuous, dense and chemically bonded graphene coating on the mold cavity surface. The cavity surface temperature increased rapidly above the glass transition temperature of a polymer by using a low voltage power suppler and could be real-time controlled. The cavity surface also achieved a uniform temperature distribution and a high cooling rate to meet the requirements for rapid thermal cycle injection molding. The experimental results indicated that the melt flow behavior was improved significantly by rapid thermal cycle injection molding with the carbide-bonded graphene coating, and the weld line defects were also eliminated.