Synthetic leather with concave patterns and preparation method thereof

The invention relates to synthetic leather with concave patterns, which is characterized in that a plurality of expansion areas are distributed on the back surface of the synthetic leather, the expansion areas are coated with expansion materials, the expansion areas expand and protrude outwards, and after the expansion materials are cured, the front surface of the synthetic leather shrinks towards the back surface to form the concave patterns. And the concave patterns correspond to the expansion areas on the back of the synthetic leather. The synthetic leather is strong in concave stereoscopic impression of patterns, clear in lines and relatively soft in hand feeling. 本发明涉及一种具有凹陷图案的合成革，其特征是：所述合成革背面分布有若干的膨胀区，膨胀区涂有膨胀材料，所述膨胀区向外膨胀凸起且膨胀材料固化后，使得合成革的正面向背面收缩形成凹陷图案，凹陷图案与合成革背面膨胀区位置对应。该合成革图案的凹陷立体感强，纹路清晰，手感相对柔软。