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首页> 外文期刊>Journal of coatings technology and research >Cure and morphology of epoxy/polyester powder coatings containing titanium dioxide: a thermally stimulated discharge study
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Cure and morphology of epoxy/polyester powder coatings containing titanium dioxide: a thermally stimulated discharge study

机译：含二氧化钛的环氧/聚酯粉末涂料的固化和形貌：热激发放电研究

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摘要

This article describes the use of thermally stimulated electrical discharge (TSD) measurements in the study of the cure processes occurring for a range of titanium dioxide, silica, and zinc oxide-pigmented epoxy polyester films. The unfilled polyester-epoxy resin system exhibits a simple TSD profile indicative of a combination of space charge and dipole relaxation processes. The addition of the Modaflow, which is used to aid in the dispersion of the pigment in the system, induces phase separation under certain cure conditions. In a number of systems, two lower temperature Ts peaks were initially observed, which collapsed into a single peak on post cure. The principal difference between the two grades of titanium dioxide was the size of the space charge peak, which is a direct indication of the mobile ion content in the material. The sulfate has higher mobile ion content than the chloride route material. Differences were observed between traces of silica and zinc oxide, which reflect the ability of the particles to interact with the resin and form a dense matrix. Silica at low concentrations is able to reduce the space charge peak which implies it can trap ions. The TSD study indicates that the pigments are able to change the morphology of the matrix which is being formed.
机译：本文介绍了热激放电（TSD）测量在研究一系列二氧化钛，二氧化硅和氧化锌色素环氧聚酯薄膜发生的固化过程中的用途。未填充的聚酯-环氧树脂体系显示出简单的TSD曲线，表明空间电荷和偶极弛豫过程相结合。 Modaflow的添加（用于帮助颜料在系统中的分散）在某些固化条件下引起相分离。在许多系统中，最初观察到两个较低的温度Ts峰，它们在后固化时塌陷为一个峰。两个等级的二氧化钛之间的主要区别在于空间电荷峰的大小，这直接表明了材料中的移动离子含量。硫酸盐比氯化物途径物质具有更高的移动离子含量。在痕量的二氧化硅和氧化锌之间观察到差异，这反映了颗粒与树脂相互作用并形成致密基质的能力。低浓度的二氧化硅能够减少空间电荷峰，这意味着它可以捕获离子。 TSD研究表明，颜料能够改变正在形成的基质的形态。

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