Organo-modified Silicone Mold Release Agent High-Temperature Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mold release agents for mold casting face challenges in achieving sufficient mold releasability, especially at high temperatures, due to decomposition and volatility of silicone components, and insufficient adhesion and lubricity in both water-based and oil-based solvents.
Innovation Solution
An organo-modified silicone is developed through an addition reaction of a chain silicone with monoolefins and aromatic hydrocarbons having alkenyl groups, and di(meth)acrylic acid esters, using a specific molar ratio and hydrosilylation catalyst, which cross-links to form a diester structure, enhancing lubricity and adhesion under high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkyl-modified silicones, alkyl- and aralkyl-co-modified silicones, or alkyl- and ester-co-modified silicones are used to enhance mold releasability through gelling and coating formation, then mold releasability under low-temperature conditions is improved, but sufficient mold releasability cannot be obtained under high-temperature conditions because the silicone component is decomposed and volatilized
Solution Approach 1:
The patent changes the chemical structure parameters of the silicone by introducing specific organo-modification groups (alkyl, aralkyl, ester) and controlling the degree of crosslinking through specific ratios of hydrolyzable groups to non-hydrolyzable groups. This allows the material to maintain stability at high temperatures while still forming effective release coatings.
Solution Approach 2:
The patent creates a composite silicone structure combining multiple functional groups (hydrolyzable alkoxy/siloxy groups for adhesion and crosslinking, non-hydrolyzable alkyl/aralkyl/ester groups for lubricity and thermal stability). This composite structure achieves both high-temperature stability and effective mold releasability.
2Stability of the object's composition
If dimethylsilicone is used to provide heat resistance and stability under high-temperature conditions, then thermal stability is improved, but mold releasability is insufficient because dimethylsilicone has high heat resistance and does not form a mold release coating when heated on a mold
Solution Approach 1:
The patent applies local quality by having different parts of the silicone molecule serve different functions: the dimethylsiloxane backbone provides thermal stability, while specific side chains with hydrolyzable groups provide coating formation and release properties. This localized functional distribution resolves the contradiction between heat resistance and mold releasability.
Solution Approach 2:
The patent merges the thermal stability of dimethylsilicone with the coating-forming capability of hydrolyzable-group-containing silicones. The resulting organo-modified silicone combines both properties, achieving high-temperature stability while maintaining effective mold release coating formation.
3Strength
If the viscosity of organo-modified silicone is increased to improve adhesion to mold, then adhesion is improved, but mold releasability is still insufficient and particularly when used for oil-based mold release agent, the mold releasability is further lowered
Solution Approach 1:
The patent optimizes the viscosity parameter within a specific range (20-1000 cSt at 25°C) to balance adhesion and releasability. This is achieved by controlling the molecular weight, degree of crosslinking, and ratio of hydrolyzable to non-hydrolyzable groups, rather than simply increasing viscosity to maximize adhesion.
Solution Approach 2:
The patent creates local quality differences in the silicone structure: highly polar regions with hydrolyzable groups provide strong adhesion to the mold surface, while non-polar regions with alkyl/aralkyl groups provide lubricity and easy releasability. This spatial differentiation of properties resolves the adhesion-releasability contradiction.
4Strength
If diorganopolysiloxane with hydrolyzable groups is used to enhance adhesion through condensation reaction, then adhesion is improved, but the diorganopolysiloxane becomes unstable and cannot provide sufficient mold releasability when used for mold release agent
Solution Approach 1:
The patent creates a composite structure where hydrolyzable groups (for adhesion) are present but limited in quantity and balanced with stable non-hydrolyzable groups. This composite approach allows controlled crosslinking for adhesion while maintaining overall molecular stability and prevent excessive condensation that would compromise releasability.
Solution Approach 2:
The patent carefully controls the parameter of hydrolyzable group content within specific ranges to achieve optimal balance. By limiting the proportion of hydrolyzable groups and controlling the degree of hydrolysis and crosslinking, the patent prevents instability while maintaining sufficient adhesion through controlled condensation reactions.
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 organo-modified silicone provides excellent mold releasability and adhesion in both water-based and oil-based solvents, maintaining performance at high temperatures and allowing for wider application areas with reduced agent usage, thereby improving mold casting efficiency and quality.
Implementation Method 1
an addition reaction of (I) a chain silicone with (II) at least one hydrocarbon selected from the group consisting of monoolefins having 4 to 18 carbon atoms and aromatic hydrocarbons having an alkenyl group and 8 to 12 carbon atoms, and (III) a di(meth)acrylic acid ester in the presence of a hydrosilylation catalyst
Implementation Method 2
the adhesion of a mold release agent to a mold is improved by increasing the viscosity of an organo-modified silicone
Data Source
AI summary
An organo-modified silicone obtained by an addition reaction of (I) a chain silicone represented by formula (1):wherein the formula (1), R1s represent hydrocarbon groups having 1 to 3 carbon atoms, and a and b are numbers satisfying conditions represented by the following formulae (i) to (iii):0≦a≦195 (i)5≦b (ii)10≦a+b≦200 (iii),with (II) a hydrocarbon such as monoolefins and aromatic hydrocarbons, and (III) a di(meth)acrylic acid ester,at a molar ratio satisfying conditions represented by the following formula (iv):{the chain silicone}:{the hydrocarbon}:{the di(meth)acrylic acid ester}=A:B:C (iv)wherein the formula (iv), A represents a number of moles of the chain silicone, and B and C are numbers satisfying conditions represented by the following formulae (v) and (vi):0.05A≦C≦A (v)A×b−2C=B (vi)in the presence of a hydrosilylation catalyst.