Branched Carboxylic Acid Silicone for Die Casting Mold Release
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Solution Overview
Problem
Conventional mold release agent compositions for die casting face challenges in ensuring adhesion, spreadability, and releasability when used in small amounts, and there is a need for formulations that can be diluted with solvents to reduce environmental impact while maintaining performance.
Innovation Solution
A branched carboxylic acid-modified silicone with specific structural units and a mold release agent composition containing it, which includes polar oils and hydrocarbon oils, providing excellent adhesion, spreadability, and releasability even in small amounts, and allowing for solvent-diluted formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional mold release agent compositions are used in small amounts, then environmental impact is reduced, but adhesion and spreadability to the die deteriorate
Solution Approach 1:
The invention modifies the chemical structure of silicone compounds by introducing branched structures and carboxylic acid groups, changing parameters such as molecular weight, polarity, and functional group composition. This enables the release agent to maintain excellent adhesion and spreadability at lower application amounts, reducing environmental impact while preserving performance
Solution Approach 2:
The invention uses composite formulations combining branched carboxylic acid-modified silicones with specific solvents and additives. This composite approach creates a synergistic effect where the modified silicone provides adhesion and spreadability even at reduced concentrations, while solvents ensure proper dilution and application characteristics
2Quantity of substance
If conventional silicone compounds are diluted with solvents, then application amount is reduced, but heat resistance and releasability deteriorate
Solution Approach 1:
The branched structure and carboxylic acid modification of the silicone compound fundamentally change its thermal stability parameters. This structural modification allows the compound to maintain heat resistance even when diluted with solvents, enabling reduced application amounts without sacrificing high-temperature performance
Solution Approach 2:
The invention selects specific solvents that act as intermediaries, compatible with the branched carboxylic acid-modified silicone. These solvents allow proper dilution for reduced application amounts while the modified silicone structure ensures heat resistance and releasability are maintained through the solvent-silicone interaction
3Reliability
If linear silicone compounds are used, then adhesion is improved, but releasability from high-temperature dies deteriorates
Solution Approach 1:
The invention creates a composite molecular structure within the silicone compound by combining linear segments (for adhesion) with branched structures containing carboxylic acid groups (for releasability). This intramolecular composite approach allows both adhesion and high-temperature releasability to coexist in a single compound
Solution Approach 2:
The branched carboxylic acid groups are strategically positioned within the silicone molecule to provide localized functionality. These local branched structures with carboxylic acid groups enhance releasability from high-temperature dies, while the overall linear backbone maintains adhesion properties
Data Source
Figure 1~3
AI summary
PROBLEM To provide a branched carboxylic acid-modified silicone which has excellent heat resistance when used at high temperatures, has excellent adhesion to a mold, vertical holding properties, and spreadability, even when used in a small amount, and can provide excellent mold releasability, and to provide a mold release agent for die casting containing the same. SOLUTION A branched carboxylic acid-modified silicone, containing in a molecule: 0.1 to 5.0 mass% of structural units expressed by RSiO3/2, R representing a monovalent hydrocarbon group; and 0.5 to 40.0 mass% of structural units expressed by RR'SiO2/2, R representing a monovalent hydrocarbon group and R' being a carboxylic acid-containing organic group, and a mold release agent composition for die casting containing the branched carboxylic acid-modified silicone (including in the form an oil agent dispersion or an oil-in-water emulsion).