Silica Organosol Surface Modification for Resin Stability

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Solution Overview

Problem

Organosols of silica often cause changes in properties or decomposition of resins and solvents due to the solid acidity of colloidal silica particles, leading to issues like color change and cracking when used with synthetic resins or dispersed in certain solvents.

Innovation Solution

Bonding alkaline earth metal ions, such as calcium or magnesium, onto the surface of colloidal silica particles in a specific ratio (0.001 to 0.2 per 1 nm^2) to reduce solid acidity, thereby stabilizing the organosol and preventing decomposition or coloring in organic solvents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If colloidal silica particles are used in organosol, then the organosol can be used as hard coat films or micro-fillers, but the solid acidity of silica causes decomposition of resins and solvents over time

Engineering Contradiction:

Improveapplication rangeVSAvoidstability over time

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

Alkaline earth metal ions serve as intermediary substances that mediate between the silica surface and the resin/solvent environment. These ions bond to the silica surface and neutralize the solid acidity, preventing direct harmful interaction between silica and organic components while maintaining the organosol's functional properties

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chemical composition parameter of the silica surface is changed by introducing alkaline earth metal ions. This modification alters the surface properties from acidic to neutral/basic, fundamentally changing the interaction characteristics with resins and solvents to prevent decomposition

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If silica sol is dispersed in organic solvents like ketones, esters, or amides, then the organosol can be formulated for specific applications, but the solid acidity catalyzes decomposition and coloring of the solvent

Engineering Contradiction:

Improvesolvent selectionVSAvoidcatalytic decomposition

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The solid acidity of silica, which initially causes harmful catalytic decomposition, is converted into a beneficial neutralizing agent. By controlling the bonding of alkaline earth metal ions, the surface acidity is precisely adjusted to eliminate harmful catalytic effects while maintaining the desired dispersion properties in organic solvents

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 modified organosol of silica inhibits changes in resin properties and decomposition when mixed with resins and prevents solvent degradation, maintaining stability and color clarity over time.

Implementation Method 1

alkaline earth metal ions are bonded on surface of colloidal silica particles

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP1754685B1Organosol of silica and process for producing the same

Publication Date: 2010.01.06 NISSAN CHEM CORP

AI summary

There provides an organosol of silica, wherein alkaline earth metal ions are bonded on surface of colloidal silica particles. The silica sol has a low solid acidity of silica, thus, in case where it is used in a mixture with a resin and the like, it can inhibit change of properties or decomposition, etc. of the resin, compared with silica sols that no alkaline earth metal is bonded to the surface of the particles. Further, the silica sol can be used as hard coat films for forming the surface of resin molded forms such as lenses, bottles, films or plates, or micro-fillers for thin films, resin internal agents, and the like.