Transparent conductive heatable pvb front windshield and method of making the same

Abstract

This invention discloses a transparent, conductive, and heatable PVB windshield and its preparation method, belonging to the field of automotive glass technology. The windshield employs a three-layer composite structure of a first glass substrate, a conductive PVB interlayer film, and a second glass substrate. Silver paste electrodes are coated on both sides of the non-viewing areas to form a conductive circuit. The conductive PVB interlayer film is obtained by casting a mixture of PVB granules and conductive masterbatch. The conductive masterbatch, by weight, comprises: 65-80 parts PVB resin powder, 4-10 parts conductive lithium salt compound, 12-20 parts plasticizer, 0.4-2 parts coupling agent, 0.3-1 part antioxidant, and 0.4-2 parts dispersant. The conductive lithium salt compound is composed of lithium bis(oxalateborate) and lithium methanesulfonyl. This invention solves the problem of existing technologies struggling to balance high transparency, high conductivity, and low cost. The product can be directly integrated into existing laminated glass production lines without equipment modification and is suitable for defrosting and defogging automotive windshields.