PVB应用于碳酸钙高填充UPVC的研究

发布时间：2018-01-22 05:10

本文关键词： PVB UPVC 碳酸钙界面相容性高填充　出处：《北京化工大学》2016年硕士论文　论文类型：学位论文

【摘要】：碳酸钙作为一种亲水憎油的极性填料,与PVC界面相容性较差,大量填充时易造成制品内部的缺陷,破坏力学性能。PVB中的羟基可提供给碳酸钙表面OH氢键结合点和Ca2+配位、静电作用点,故两者理论上具有良好的界面相容性。本文通过定量计算PVB/碳酸钙、PVC/碳酸钙的界面作用参数,以此研究PVC/PVB/碳酸钙复合材料中以PVB作为碳酸钙粘接剂来对体系进行增韧增强的可能性：1、用挤出流延法制备PVB/碳酸钙膜材料,通过测量拉伸强度得PVB/碳酸钙界面参数远大于PVC／碳酸钙界面参数。红外光谱分析结果表明,PVB与碳酸钙表面的羟基之间形成氢键,发生缔合。通过对PVB/碳酸钙材料的SEM图分析可知,PVB/碳酸钙界面结合优于PVC/碳酸钙。2、设计正交实验,通过双辊开炼法压制UPVC板材,并对其进行测试。得最佳因素水平：5份PVB,此时PVB/PVC相容性较好；1.5份DIDP,用于改善PVB分子链的运动能力；60份5000目碳酸钙,其目数对冲击性影响较大。最佳配方力学性能较空白样,冲击强度提升140.6%,同时拉伸强度和弯曲强度也有所提升。其中PVB因素对材料的力学性能影响最大。混料工艺B使材料的冲击强度明显增加,但材料的拉伸强度和弯曲强度有所降低。流变曲线分析表明,体系中加入PVB可促进塑化,降低平衡扭矩。热失重实验分析表明,制品主要有两个热失重阶段,且PVB添加份数较多的体系热稳定性较好。3、通过实验得,加入3份SD5型PVB使制品冲击强度提升243.8%；加入3份SD1型使体系冲击强度提升255.6%,但会使拉伸强度下降。当高粘度PVB与低粘度PVB复配比为2：1时,体系的综合力学性能较好。由实验结果可知,PVB对碳酸钙高填充UPVC制品有较好的增韧效果,且保证材料的拉伸强度不会下降。
[Abstract]:As a hydrophilic and hydrophobic polar filler, calcium carbonate has poor compatibility with PVC interface. The hydroxyl group in PVB can provide the OH hydrogen bonding point and Ca2 coordination point on the surface of calcium carbonate and electrostatic action point. Therefore, they have good interfacial compatibility in theory. In this paper, the interface parameters of PVB / Caco _ 3 / PVC / Caco _ 3 are calculated quantitatively. The possibility of toughening and strengthening the system with PVB as the adhesive of calcium carbonate in PVC / PVB / calcium carbonate composite was studied. The PVB / calcium carbonate film material was prepared by extrusion casting method. The interface parameters of PVB / calcium carbonate were much larger than those of PVC / calcium carbonate by measuring tensile strength. The results of infrared spectroscopy showed that hydrogen bond was formed between PVB and hydroxyl groups on the surface of calcium carbonate. Through the SEM diagram analysis of PVB / calcium carbonate material, the interface bonding of PVB / calcium carbonate was better than that of PVC / calcium carbonate. The orthogonal experiment was designed. The UPVC sheet was compacted by double roll opening process and tested. The optimum factor level was 5 parts, and the compatibility of PVB/PVC was better. (1) DIDP, which was used to improve the mobility of PVB molecular chain. The number of calcium carbonate in 60 phr of calcium carbonate has a great influence on the impact property. The optimum formula has a better mechanical property than the blank sample, and the impact strength is increased by 140.6%. At the same time, the tensile strength and flexural strength were also improved. The PVB factor had the greatest influence on the mechanical properties of the material. The impact strength of the material was obviously increased by blending process B. However, the tensile strength and bending strength of the material decreased. The rheological curve analysis showed that the addition of PVB in the system could promote plasticization and reduce the equilibrium torque. There are mainly two thermogravimetric stages of the product, and the thermal stability of the system with more PVB content is better. The experimental results show that the impact strength of the product is increased 243.8% by adding 3 phr SD5 PVB. The impact strength of the system increased by 255.6 parts with the addition of 3 phr SD1 type, but the tensile strength decreased. When the ratio of high viscosity PVB to low viscosity PVB was 2: 1. The experimental results show that PVB has a good toughening effect on UPVC products filled with calcium carbonate, and the tensile strength of the composites will not decrease.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ325.3;TB332

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