丙烯酸树脂漆渣共混改性PVC泡沫复合材料性能研究

利用回收热塑性丙烯酸树脂漆渣共混改性聚氯乙烯(PVC)发泡体系,并通过热压法制备泡沫复合材料,研究了树脂漆渣添加量对体系剪切黏度及发泡产品泡孔微观形貌、表观密度、力学和耐热性能的影响。结果表明:丙烯酸树脂漆渣的加入可增加PVC分子链间相互作用力,提高PVC发泡体系的剪切黏度,从而调控熔体强度,得到泡孔结构细密均匀的泡沫复合材料;最佳树脂漆渣添加量为10%,PVC发泡体系的剪切黏度由2 726.1 Pa·s升至9 029.4 Pa·s,制备的PVC泡沫复合材料表观密度由0.63 g/cm ³降至0.49 g/cm ³,弯曲强度和冲击强度分别由13.6 MPa和4.7 kJ/m ²升至18.2 MPa和8.9 kJ/m ²,玻璃化转变温度(T_g)由72 ℃升至75 ℃。

Study on properties of acrylic resin paint slag modified PVC foam composites

Polyvinyl chloride (PVC) foam system was modified with the blending of recycled thermoplastic acrylic resin and paint slag, and the foam composite was prepared by using hot-pressing method. The effects of the paint slag dosage on the shear viscosity of blending systems and microstructure, apparent density, mechanical properties and heat resistance of the resulting PVC foam composites were investigated. The results indicated that the addition of acrylic resin paint slag could increase the interaction between PVC molecular chains, improve the shear viscosity and regulate the melt strength of PVC foaming systems, thus leading to PVC foams with small and homogeneous cellular structures. With adding of 10% paint slag, the shear viscosity of blending system increased from 2 726.1 Pa·s to 9 029.4 Pa·s, and the resulted PVC foam composite exhibited optimal comprehensive performances, in which the apparent density decreased from 0.63 g/cm 3 to 0.49 g/cm 3, the flexural and impact strength increased from 13.6 MPa and 4.7 kJ/m 2 to 18.2 MPa and 8.9 kJ/m 2, respectively, and Tg increased from 72 ℃ to 75 ℃.