The invention discloses a functional gradient PVB interlayer film, a preparation method and
laminated glass, at least one main surface of the PVB interlayer film is provided with a preset pattern composed of materials with remarkably different
adhesive forces, and the pattern comprises a high-
adhesive-force area composed of a first PVB composition, a low-
adhesive-force area composed of a second PVB composition, and a high-adhesive-force area composed of a second PVB composition. The adhesive force F1 between the high adhesive force area and the glass is greater than the adhesive force F2 between the low adhesive force area and the glass; the film can be realized through structures such as symmetric multi-layer
embossing, asymmetric lamination or single-layer patterning. The preparation method comprises a co-
extrusion embossing method, a co-
extrusion tape casting method, a local printing method and a
laser surface modification method. According to the preparation method, the PVB interlayer film is spanned from passive
impact bearing to an active guiding
mechanical failure mode, the requirements of high
impact resistance and easy local breaking and convenient rescue in emergency are comprehensively balanced, the preparation efficiency is high, the compatibility is good, and active design and optimal balance of the safety performance of the
laminated glass can be realized.