摘要
采用碳酸钙填充,邻苯二甲酸二辛酯(DOP)改性制备了PVC防水卷材,研究了DOP、轻质碳酸钙(PCC)和重质碳酸钙(GCC)对PVC防水卷材力学性能、加工性能以及微观结构的影响。结果表明:随着DOP含量的增加,PVC防水卷材的拉伸强度和撕裂强度下降,断裂伸长率增加,加工性能得到很大改善。在碳酸钙含量一定的情况下,GCC填充体系的力学性能优于PCC填充体系,但加工性能稍差。当DOP含量为50份,GCC含量为20~30份时,加工过程容易,拉伸强度最大,为14.58 MPa,撕裂强度最大,为69.15 N/mm,保证了体系在较好加工性能的前提下,使材料具有优良的力学性能。通过扫描电镜发现,随着DOP含量的增加,界面变得更加平整光滑,两者相容性更好;在碳酸钙含量20份的情况下,重钙体系的界面模糊且平整光滑,相容性较好,而轻钙体系的界面相对清晰且粗糙,相容性较差。
Polyvinyl chloride （PVC） waterproofing membrane filled by calcium carbonate and modified by dioctyl phthalate（DOP） was prepared, and the influences of DOP, precipitated calcium carbonate （PCC） and grounded calcium carbonate（GCC） on performances of PVC waterproofing membrane was introduced, such as mechanical properties,processing performance and microstructure. The results showed that the tensile strength and tear strength of PVC waterproofing membrane decreased with the increase of the content of DOP,while the elongation at break increased and proeessability improved greatly. In the case of the same calcium carbonate dosage,the mechanical properties of the GCC system were superior to that of the PCC system,but processing performances were slightly worse. When the DOP content was 50 phr and GCC dosage was 20 - 30 phr, the process was easy,the maximum tensile strength was 14. 58 MPa,tear strength was up to 69. 15 N/ram,the system had excellent mechanical properties under the premise of ensuring better processing performance. By scanning electron microscope, it was found that the interface became more smooth and the compatibility was more better with the increase of DOP content;In the case of 20 phr calcium carbonate dosage, GCC system had better compatibility and the interface was fuzzy and smooth,but PCC system had poor compatibility and the interface was relatively clear and rough.
出处
《塑料》
CSCD
北大核心
2017年第5期35-38,42,共5页
Plastics
关键词
PVC防水卷材
轻质碳酸钙
重质碳酸钙
力学性能
加工性能
PVC waterproofing membrane
precipitated calcium carbonate
grounded calcium carbonate
mechanicalproperty
processing performance
