Scratch-resistant low-warpage transparent BOPET film and preparation method thereof

Abstract

The invention discloses a scratch-resistant low-warpage transparent BOPET film which is prepared from the following components in percent by weight: 80-99.5% of a PET section and 0.5-20% of a white graphene compound PET section. The white graphene compound PET section is prepared from the following components in parts by weight: 0.01-15 parts of modified white graphene, 65-99.89 parts of the PET section and 0.1-20 parts of a compatilizer. The BOPET film selecting and exerting a white graphene material chemical grafting technique also prevents buckling deformation at a high temperature and separation out of low polymers effectively while being high in hardness and scratch-resistant, the optical performance is not affected, appearance abnormality in a late-stage operation is reduced, and theyield of a production line is improved. Moreover, a PET substrate is not hardened or is only hardened on a single face before being plated or coated, so that the cost is reduced.

Description

technical field [0001] The invention relates to a PET material, in particular to a transparent BOPET film with scratch resistance and low warpage and a preparation method thereof. Background technique [0002] BOPET polyester film refers to a film made of polyethylene terephthalate polymer in the polyester family by biaxial stretching. Compared with glass, BOPET optical film with high flexibility, high light transmittance and low haze is already the main substrate material for coating and coating manufacturers. At present, domestic manufacturers mainly use imports from Japan and South Korea, resulting in high cost of substrates. However, there are many problems in the production and sales of PET substrates in domestic manufacturers: on the one hand, PET optical films are easy to warp when they are resistant to high temperatures, which affects the subsequent process. On the other hand, the hardness of the PET base material used for coating and coating is low, generally hover...

AI Technical Summary

Problems solved by technology

At present, domestic manufacturers mainly use imports from Japan and South Korea, resulting in high cost of substrates. However, there are many problems in the production and sales of PET substrates in domestic manufacturers: on the one hand, PET optical films are easy to warp when they are resistant to high temperatures, which affects the subsequent process. On the other hand, the hardness of the PET base material used for coating and coating is low, generally hovering between 2-3H, which can easily cause scratches on both sides of the PET film, which has a great impact on the subsequent process, and the yield rate is low. Substantial reduction and cost increase; the defect of low hardness and non-wear resistance is not suitable for the increasingly popular flexible cover or used as a screen explosion-proof film

[0003] In order to improve the non-wear-resistant and easy-to-scratch problems of PET substrates, relevant personnel in the photoelectric film industry need to coat a layer of inorganic nano-coating on both sides of the PET substrate for double-sided hardening treatment, which affects The transmittance of the PET film; and the adhesion to the substrate after being coated with a wear-resistant coating is not very good. When coating or coating a conductive coating as a rear touch screen, the entire conductive layer will fall off and the turtle will be scratched. Cracks, resulting in NG function of the touch display device, affecting the yield

[0004] However, there are few reports on direct use of new two-dimensional nanomaterials to make transparent PET substrates by bidirectional stretching after composite modification of PET slice raw materials themselves to replace or reduce the hardening of double-sided coating in the latter stage.

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