Abstract The core of decorative laminates is generally made of stacked Kraft paper sheets impregnated with a phenolic resin. As the impregnation process in industry is relatively fast, new methods need to be developed to characterize it for different paper-resin systems. Several phenolic resins were synthesized with the same Phenol:Formaldehyde ratio of 1:1.8 and characterized by Fourier Transform Infrared Spectrometry (FTIR) as well as Size-Exclusion Chromatography (SEC). In addition, their viscosities and surface tensions when diluted in methanol to 45% of solid content were measured. The capacity of each resin to penetrate a Kraft paper sheet was characterized using a new method, which measures the conductivities induced by the liquid resin crossing the paper substrate. With this method, crossing times could be measured with a good accuracy. Surprisingly, the results showed that the penetration time of the resin samples is not correlated to the viscosity values, but rather to the surface tension characteristics and the chemical characteristics of paper. Furthermore, some resins had a higher swelling effect on the fibers that delayed the crossing of the liquid through the paper.

中文翻译：

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酚醛树脂制备对其性能的影响及其在牛皮纸中的渗透行为

摘要 装饰层板的芯材一般由浸渍酚醛树脂的牛皮纸叠层制成。由于工业中的浸渍过程相对较快，需要开发新的方法来表征不同的纸树脂系统。合成了几种酚醛树脂，其苯酚：甲醛比为 1:1.8，并通过傅立叶变换红外光谱 (FTIR) 和尺寸排阻色谱 (SEC) 进行表征。此外，还测量了它们在甲醇中稀释至固含量的 45% 时的粘度和表面张力。每种树脂渗透牛皮纸的能力使用一种新方法进行表征，该方法测量液体树脂穿过纸基材引起的电导率。使用这种方法，可以准确地测量穿越时间。令人惊讶的是，结果表明树脂样品的渗透时间与粘度值无关，而是与表面张力特性和纸张的化学特性相关。此外，一些树脂对纤维具有更高的溶胀作用，从而延迟了液体穿过纸张。