【作者】 王娟；

【导师】 高延敏；

【作者基本信息】 江苏科技大学 ， 材料物理与化学， 2010， 硕士

【摘要】 聚氯乙烯是一种重要的耐腐蚀塑料,在管线等化工方面具有广泛的应用。然而其本身耐温性方面较差。如何在保留其耐腐蚀性的同时,扩大其在应用范围是急需解决的问题。本论文的研究的基本设想是:主要通过对在金属与PVC管之间的胶粘剂改性来解决上述问题。为此本论文侧重研究PVC与金属管材间的胶粘剂的粘结性进行研究。本论文采用分子设计的思想,充分考虑工业生产耐温性的要求,利用耐热的芳香胺为固化剂;选用固化促进剂实现室温下固化;选用聚酰胺为增韧剂对环氧树脂进行改性;并采用导热系数小的蛭石为填料,选用硅烷偶联剂KH-550对蛭石进行改性,并通过扫描电镜(SEM)、红外(FT-IR)和接触角测试等对蛭石表面的物理化学性能进行了表征。采用热重(TG)、扫描电镜、红外图谱、交流阻抗以及胶体剪切强度对等性能测试手段研究了粘结性影响因素与机理。同时考察了硅烷偶联剂接枝改性PVC对粘结强度的影响。获得的主要结果如下:1)选用混合芳香二胺类固化剂(DDM:m-PDA=2:3)固化树脂,正丁醇为稀释剂,双酚A为固化促进剂,用量分别占树脂胶体的15%、20%、10%时,胶体的性能达到最佳值。2)通过TG热重分析和胶体剪切强度分析确定聚酰胺的最终用量为10%;对胶粘剂进行电化学阻抗(EIS)技术分析说明胶体的耐蚀性能良好。3)SEM结果显示蛭石表面的性能及其在胶体中的分散性得到了改善。4)通过胶体的胶粘性能和隔热性能测试确定填料的添加量为10%时胶体的隔热性能和粘接性能最好。对添加10%填料的胶体做热重分析,确定其适用温度并分析填料对胶体耐热性能的影响。通过阻抗分析,说明填料的加入可以提高胶体的耐蚀性能。5)采用水和乙醇的混合溶剂水解较水或乙醇单一溶剂水解得到的硅烷膜性能好。经过硅烷偶联剂改性的PVC,粘结性能得到提高。更多还原

【Abstract】 PVC is an important corrosion-resistant plastic, has a wide range of applications in the pipeline and other chemicals. However, it is poor in terms of heat resistance. While retaining their corrosion resistance, how to expand its scope of application is an urgent problem. The basic idea of this paper studies is: Mainly through modifying the adhesive between the PVC pipe and metal to address these issues. This thesis research focus on the study of adhesive bonding between PVC and metal tube.In this thesis, the idea of molecular design is taken.And r the requirements of heat resistance in industrial production is fully consided.Using the heat-resistant aromatic amineas as curing agent; selecting curing accelerator to achieve room temperature curing;Polyamide is used for the toughening modify of the epoxy resin; And using the small thermal conductivity vermiculite as filler.Silane coupling agent KH-550 was used to modify vermiculite. And the physical and chemical properties of vermiculite surface were characterized by scanning electron microscopy (SEM), infrared (FT-IR) and contact angle test.The bonding effect and mechanism are studied by thermogravimetric analysis(TG), scanning electron microscopy(SEM), infrared spectrum (IR), electrochemical impedance spectrum (EIS) technology ,colloidal shear strength tests and other properties. The impact of silane coupling agent grafting PVC on bond strength is also studied.The main results obtained are as follows:1) Mixed aromatic diamine curing agents (DDM: m-PDA = 2:3) are used to solidify resin with butanol as diluent, bisphenol A as curing accelerato.And the gel achieves the best value performance with the amount accounted for 15% of resin gel, 20% of resin gel , 10% of resin gel.2) The final amountis of polyamide is 10% determined by TG and colloidal shear strength analysis; the adhesive colloid shows good corrosion resistance by electrochemical impedance (EIS) technical analys.3) SEM results show that the performance of the vermiculite surface and its dispersion in colloidal is improved.4) When the filler amount is 10% of gel , the insulation performance and adhesive performanceare of the gel are best determined by the testing of adhesion property and thermal performance testing of the colloidal.Tthe filler added with 10% of resin gel is analysised.The application temperature of fillers and heat performance of the colloid are determined by thermogravimetric analysis. Electrochemical impedance (EIS) technical analysis shows that adding fillers can enhance the corrosion resistance of colloidal.5) The silane film performance is more superior with mixed hydrolysis solvent with water and ethanol than a single hydrolysis solvent with water or ethanol solvent. Bonding performance of PVC is improved after modified by silane coupling agent.更多还原