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首页> 外文会议>Regional Conference of the Polymer Processing Society >On the Use of Interfacial Tension Parameter to Predict Reduction of Friction by Mold Coatings in Injection Molding of Polyamide 6
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On the Use of Interfacial Tension Parameter to Predict Reduction of Friction by Mold Coatings in Injection Molding of Polyamide 6

机译：关于界面张力参数的使用预测聚酰胺注射成型中的模具涂层摩擦的降低

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The first contact of liquid hot polymer melt to mold surface while injection is a pressure-supported wetting process. After filling is completed, the melt is cooled down to a solid part, which is finally ejected. This separation of solid polymer from solid mold surface is considered to be a dewetting process. The wetting parameter interfacial tension γ12 estimates the resistance of a liquid-solid interface to be separated under external load. If γ_(12) also predicts the resistance of solid-solid interface to be separated under external load, γ_(12) could be used to improve mold coatings for reducing friction in injection molding. Based on the analysis of γ_(12) equation, the following hypothesis is stated: Low γ_(12) of a polymer - mold coating interface indicates elevated friction and vice versa. This has been examined in a series of experimental tests. First, from 40 to 200°C, contact angles of test liquids bromonaphtalene and ethylencarbonate were captured on solid Polyamide 6 (PA6, Durethan B30S) and on mold coatings a-C:H, CrC/a-C:H, CrN, NbC, NbN, and MoN. Every specimen's surface energy was determined using the OWRK method. All materials show a distinct temperature dependence of surface energy and its polar and disperse fractions. Then, γ_(12) of the mold coatings to PA6 was calculated for a temperature of 90°C. Finally, same PA 6 and the coated specimen were tested in a friction test injection mold. The static coefficient of friction μ_0 was determined at a friction contact temperature of 90°C. As expected, most coatings rank in friction to PA6 as γ_(12) suggests, i.e. friction decreases from MoN, a-C:H, NbC, NbN, CrN, to CrC/a-C:H, while γ_(12) increases from MoN, a-C:H, NbN, NbC, CrN, to CrC/a-C:H.
机译：液态热聚合物熔化在模具表面的第一次接触，同时注射是压力支撑的润湿过程。填充完成后，将熔体冷却至固体部分，该固体部分最终弹出。从固体模塑表面的这种固体聚合物的这种分离被认为是脱水过程。润湿参数界面张力γ12估计在外部负载下分离的液固界面的电阻。如果γ_（12）还预测在外部负载下待分离的固体界面的电阻，则可以使用γ_（12）来改善用于减少注塑中的摩擦的模具涂层。基于γ_（12）方程的分析，陈述了以下假设：聚合物 - 模具涂层界面的低γ_（12）表示摩擦升高，反之亦然。这已在一系列实验测试中进行了检查。首先，从40〜200℃，在固体聚酰胺6（PA6，Durethan B30s）和模具涂料AC上捕获测试液体溴苯吡啶和乙基丙酯的接触角和乙烯丙烯酸酯：H，CRC / AC：H，CRN，NBC，NBN和周一。使用OWRK方法确定每个样本的表面能。所有材料显示出表面能量和极性和极性分散馏分的不同温度依赖性。然后，将模具涂层的γ_（12）与PA6的γ_（12）计算为90℃的温度。最后，在摩擦试验注射模具中测试相同的PA 6和涂覆的样品。在90℃的摩擦接触温度下测定摩擦μ_0的静态系数。正如预期的那样，大多数涂料在摩擦中排名为PA6，因为γ_（12）表明，即摩擦从MON，AC：H，NBC，NBN，CRN，CRC / AC，而γ_（12）从Mon，AC增加：H，NBN，NBC，CRN，CRC / AC：h。

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