# Preparation of Transparent and Scratch-Resistant Organic–Inorganic Hybrid Coatings: Role and Mechanism of Silane-Modified Nano-SiO2

## TL;DR

Researchers developed transparent, scratch-resistant coatings using modified nano-silica to improve the durability of optical plastics.

## Contribution

A novel UV-curable hybrid coating system using silane-modified nano-silica is introduced to enhance scratch resistance without compromising transparency.

## Key findings

- Modified nano-silica increased pendulum hardness by nearly 50% while maintaining flexibility.
- Coatings retained over 90% optical transmittance at 4 wt% nano-silica loading.
- KH-550 modification required strict pH control for sol stability.

## Abstract

Optical plastics possess excellent optical and mechanical properties but are limited by poor surface hardness and scratch resistance. Herein, UV-curable organic–inorganic hybrid coatings were developed to enhance scratch resistance while maintaining high optical transparency. Nano-silica sols were prepared via tetraethoxysilane (TEOS) hydrolysis and surface modified with silane coupling agents (KH-560, KH-570, and KH-550) to improve their dispersion and interfacial reactivity in a polyurethane acrylate (PUA) matrix. The modified nano-silica was incorporated into a UV-curable PUA system to fabricate transparent composite coatings. The influences of nano-silica type and loading on hardness, flexibility, wettability, scratch resistance, and UV–visible transmittance were systematically evaluated. Modified nano-silica markedly improved pendulum hardness and scratch resistance, with hardness increasing by nearly 50%, while flexibility remained nearly unchanged. Although hydrophobicity and optical transmittance slightly decreased with increasing nano-silica content, the transmittance remained above 90% at 4 wt% loading. For KH-550 modified systems, strict pH control (pH 8.0) and ammonia removal were critical for sol stability. This work offers a feasible approach for fabricating scratch-resistant, transparent UV-curable coatings for optical plastics.