In this paper, a new polyether titanate coupling agent (Ti₄₀₀₀) was used to modify basic magnesium carbonate (BMC), and Ti₄₀₀₀ modified BMC (Ti₄₀₀₀‐BMC) was characterized by X‐ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and X‐ray photoelectron spectroscopy. Then, PVC composites were prepared by adding BMC or Ti₄₀₀₀‐BMC into soft PVC matrix via melt blending, and their flame retardancy was examined by limiting oxygen index (LOI), UL‐94 test, and cone calorimeter test. The results show that BMC can effectively improve flame resistance and suppress smoke production of pure soft PVC. As a result, the LOI is increased from 23.9% for pure soft PVC to 29.2% for Ti₄₀₀₀‐BMC/PVC composite with 50 phr Ti₄₀₀₀‐BMC (50%Ti₄₀₀₀‐BMC/PVC), and the composite passes the V0 rating in UL‐94 test, the peak heat release rate, total heat release, peak smoke production rate, and total smoke production are decreased from 343.10 kW/m², 94.50 MJ/m², 0.17 m²/s, and 27.20 m²/kg for pure soft PVC to 234.20 kW/m², 70.20 MJ/m², 0.02 m²/s, and 2.30 m²/kg for 50%Ti₄₀₀₀‐BMC/PVC composite, respectively. The analysis of char residues suggests that Ti₄₀₀₀‐BMC/PVC composites form the most compact char layer structure, indicating that the soft PVC composites show better char forming ability. In addition, the yield strength is increased from 4.4 MPa for pure soft PVC to 12.9 MPa for 50%Ti₄₀₀₀‐BMC/PVC composite, with an increase of 193.2%, and it shows good reinforcement effect on the soft PVC matrix.

中文翻译：

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聚醚钛酸酯偶联剂对软质聚氯乙烯/碱式碳酸镁复合材料阻燃性和力学性能的影响

本文使用新型聚醚钛酸酯偶联剂（Ti ₄₀₀₀）改性碱性碳酸镁（BMC），并通过X射线粉末衍射，傅立叶变换红外光谱对Ti ₄₀₀₀改性的BMC（Ti ₄₀₀₀ ‐BMC）进行了表征，扫描电子显微镜和X射线光电子能谱。然后，通过将BMC或Ti ₄₀₀₀ - BMC通过熔融共混添加到柔软的PVC基体中来制备PVC复合材料，并通过极限氧指数（LOI），UL-94测试和锥形量热仪测试来检查其阻燃性。结果表明，BMC可以有效提高纯软PVC的阻燃性并抑制烟雾的产生。结果，LOI从纯软PVC的23.9％增加到Ti _4000的29.2％‐具有50 phr Ti ₄₀₀₀ ‐BMC（50％Ti ₄₀₀₀ ‐BMC / PVC）的BMC / PVC复合材料，并且该复合材料通过了UL‐94测试中的V0等级，峰值放热率，总放热，峰值烟气产生率和总产烟从343.10千瓦/米减小²，94.50 MJ /米²，0.17米² / s，并且27.20米² / kg的纯软PVC至234.20千瓦/米²，70.20 MJ /米²，0.02对于50％Ti _4000- BMC / PVC复合材料，分别为m ² / s和2.30 m ² / kg 。炭渣分析表明，Ti ₄₀₀₀‐BMC / PVC复合材料形成最致密的炭层结构，表明柔软的PVC复合材料显示出更好的炭形成能力。此外，屈服强度从纯软PVC的4.4 MPa增加到50％Ti _4000- BMC / PVC复合材料的12.9 MPa，增加了193.2％，对软PVC基体表现出良好的增强作用。