马来酸酐接枝聚乙烯蜡微粉的制备工艺及其在粉末涂料中的应用研究

Preparation process of PEW-g-MAH micropowders and their application in powder coatings

首先以二甲苯(PX)为溶剂,聚乙烯蜡(PEW)为接枝主链,过氧化苯甲酰(BPO)为引发剂,将马来酸酐(MAH)接枝到PEW上,制备PEW-g-MAH接枝料;其次,以丙酮为沉淀剂,使其析出沉淀;最后,对上述混液进行抽滤、干燥、研磨、筛分,得到PEW-g-MAH微粉。利用傅里叶变换红外光谱仪(FTIR)和激光衍射粒度分析仪(LDPA)对产物结构进行表征,通过附着力测试仪对产物进行附着力性能测定。通过考察单因素与设计正交试验,探究反应最佳的工艺条件。结果表明,当PEW的含量为10 g,此时MAH的最佳含量为0.6 g,最佳反应温度为110℃,引发剂的最佳含量为0.2 g,最佳反应时间为4 h。该条件下,MAH的接枝效率最高,为58.57%,接枝率为3.51%,平均粒径为15.54μm,附着力为0级。因此,该PEW-g-MAH微粉在粉末涂料中具有较好的应用潜力。

In this work,maleic anhydride(MAH)was first grafted onto polyethylene wax(PEW)using xylene(PX)as a solvent,benzoyl peroxide(BPO)as an initiator,resulting in the formation of a PEW-g-MAH grafting copolymer.The resultant grafting copolymer then slowly added to acetone to perform precipitation with acetone as a precipitant.The PEW-g-MAH micropowders were obtained from the above mixture through suction filtration,drying,grinding,and screening.The structure of the obtained product was characterized by Fourier-transform infrared spectroscopy and laser diffraction particle-size analyzer,and its adhesion was measured using an adhesion tester.The optimum reaction conditions were explored through investigating single factor and orthogonal design experiments.The results indicated that the optimal reaction parameters were determined to be a PEW amount of 10 g,an MAH amount of 0.6 g,a reaction temperature of 110℃,an initiator amount of 0.2 g,and a reaction time of 4 h.Under this condition,MAH achieve the highest grafting efficiency of 58.57%together with a grafting rate of 3.51%,an average particle size of 15.54μm,and adhesion of grade 0.The PEW-g-MAH micropowders exhibit great potential for the application in powder coatings.