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Viscosity of paint

Abstract: 本文探讨了涂料黏度的定义及其对涂膜性能的影响。涂料黏度是指剪切力与剪切应变速率的比值，其大小反映了涂料在施工过程中的流动性和成膜特性。根据国家标准GB/T 1723-93，涂料黏度可通过黏度杯法或落球黏度计测定。涂料黏度受多种因素影响：涂料组成和助剂种类决定了基本的流变特性；树脂含量越高，黏度越大；高分子链的相对分子量和分布直接影响非牛顿性表现（即黏度对剪切力的依赖程度）；颜填料细度越高，分散性能越佳，黏度也越大；溶剂溶解性能越好，涂料膜致密性越高；施工温度越高，黏度减小，与基材结合性能增强。这些因素共同决定了涂料的流变特性，对涂料配方优化和施工工艺选择具有重要意义。


The viscosity of a paint is the ratio of the shear force to the shear strain rate.

Determination of viscosity 

*National standard GB/T 1723-93TU-1, TU-4 Viscosity Cup and falling ball viscometer

Influencing Factors of Coating Viscosity

*The composition of the paint, the type of additives, the higher the resin content, the greater the viscosity

*The relative molecular weight and distribution of the polymer chain of the film-forming material The higher the relative molecular weight, the greater the viscosity: the better the flexibility of the molecular chain, the greater the non-Newtonian property of the coating, that is, the greater the dependence of viscosity on shear force. 

*Fineness of pigments and fillers The higher the fineness of pigments and fillers, the better the dispersion and the higher the viscosity

*Solvent Solubility The better the solubility, the greater the viscosity, the higher the density of the formed film and the more uniform the structure. 

*Construction temperature The higher the construction temperature, the lower the viscosity and the better the bonding performance with the base material. 


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