Long-Chain Siloxane Binder for Photocatalytic Coatings

Solution Overview

Problem

The use of hydrolysis condensates of tetraalkoxysilane as binders in photocatalytic coating layers increases the viscosity and surface roughness of optical films, leading to reduced transparency due to increased haze, as the binder forms a three-dimensional mesh structure.

Innovation Solution

A photocatalytic coating agent comprising a hydrolysis condensate of tetraalkoxysilane as a long-chain siloxane compound, which maintains low viscosity and prevents surface roughness, combined with photocatalyst particles and a liquid medium, such as water and alcohol, to form a smooth and transparent photocatalytic coating layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hydrolysis condensate of a tetraalkoxysilane is used as a binder for a photocatalytic coating layer, then the binder provides high hardness and scratch resistance, but the viscosity of the coating agent increases and the surface roughness increases

Engineering Contradiction:

ImprovehardnessVSAvoidviscosity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent changes the molecular structure parameter of the siloxane binder from a three-dimensional mesh shape to a linear chain shape. This structural parameter change allows the binder to provide sufficient hardness and scratch resistance while maintaining lower viscosity, thereby resolving the contradiction between strength and ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

2Strength

If a hydrolysis condensate of a tetraalkoxysilane is used as a binder for a photocatalytic coating layer, then the binder provides high hardness and scratch resistance, but the surface roughness of the photocatalytic coating layer increases

Engineering Contradiction:

Improvescratch resistanceVSAvoidsurface roughness

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The patent changes the molecular structure parameter of the siloxane binder from a three-dimensional mesh shape to a linear chain shape. This structural parameter change allows the binder to provide sufficient hardness and scratch resistance while maintaining lower viscosity, thereby resolving the contradiction between strength and ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

3Strength

If a hydrolysis condensate of a tetraalkoxysilane is used as a binder for a photocatalytic coating layer, then the binder provides high hardness and scratch resistance, but the haze of the optical film increases and transparency decreases

Engineering Contradiction:

ImprovehardnessVSAvoidhaze

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the molecular structure parameter of the siloxane binder from a three-dimensional mesh shape to a linear chain shape. This structural parameter change allows the binder to provide sufficient hardness and scratch resistance while maintaining lower viscosity, thereby resolving the contradiction between strength and ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution achieves a photocatalytic coating layer with high hardness, scratch resistance, and antiviral activity while maintaining low haze and high transparency by controlling the viscosity and surface smoothness of the optical film.

Implementation Method 1

the binder is a hydrolysis condensate of a tetraalkoxysilane

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

Photocatalysts provide photocatalytic activity upon receiving light

Methodology Applied

Scientific EffectPhotocatalysis: Photo-oxidation

Data Source

PatentUS20240010871A1Photocatalytic coating agent, photocatalytic film, display device, and binder synthesis method

Publication Date: 2024.01.11 SHARP KK

AI summary

A photocatalytic coating agent of the present disclosure includes a liquid medium, photocatalyst particles, and a binder, in which the binder is a hydrolysis condensate of a tetraalkoxysilane and is a long-chain siloxane compound.