Silane-Treated Calcium Carbonate Polymer Compatibility
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Solution Overview
Problem
The incorporation of untreated calcium carbonate into polymer matrices is limited by its hydrophilic character, leading to issues such as decreased tensile strength and elevated moisture content, and existing silane-treated calcium carbonate particles face challenges in applying coatings due to the lack of hydroxyl groups on the surface.
Innovation Solution
A composition comprising a calcium carbonate core treated with a compound containing silicon and hydroxyl groups, followed by a second layer of silane-based coatings such as aminosilane, vinylsilane, or alkylsilane, applied through an aqueous silicate process, to enhance surface properties and improve compatibility with polymer matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If calcium carbonate is treated with aliphatic carboxylic acids to increase elasticity, then elasticity is improved, but tensile strength decreases
Solution Approach 1:
The patent changes the chemical parameters of the surface treatment by using silane compounds with specific functional groups (amino, epoxy, hydroxyl) instead of traditional aliphatic carboxylic acids. This parameter change allows achieving both improved elasticity and maintained tensile strength through covalent bonding and crosslinking mechanisms that provide both flexibility and strength.
Solution Approach 2:
The patent creates a composite surface treatment system where silane molecules form a bridging layer between the calcium carbonate core and the polymer matrix. This composite structure combines the inorganic calcium carbonate with organic silane functional groups, achieving synergistic effects that simultaneously improve elasticity and tensile strength.
2Adaptability or versatility
If calcium carbonate is treated with silane coating agents, then surface functionality is improved, but the lack of hydroxyl groups on untreated calcium carbonate surface causes difficulty in applying coating
Solution Approach 1:
The patent introduces a preliminary surface activation step where the calcium carbonate surface is treated to generate hydroxyl groups before applying the silane coating. This preliminary action creates the necessary surface chemistry (hydroxyl groups) that enables subsequent silane coating application, solving the adhesion problem without compromising the final surface functionality.
Solution Approach 2:
The patent uses hydroxyl groups as an intermediary substance that mediates between the calcium carbonate surface and the silane coating agent. These hydroxyl groups serve as attachment points that facilitate the bonding of silane molecules to the calcium carbonate surface, enabling the coating process to proceed effectively.
3Quantity of substance
If calcium carbonate particles are used as filler, then cost is reduced, but hydrophilic character leads to decreased tensile strength and elevated moisture content
Solution Approach 1:
The patent changes the surface chemical parameters of calcium carbonate by introducing hydrophobic silane functional groups (such as methyl, phenyl, or long-chain alkyl groups) that replace the hydrophilic character. This parameter change transforms the surface from hydrophilic to hydrophobic, improving compatibility with polymer matrices and maintaining tensile strength while preserving the cost advantage of using calcium carbonate filler.
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 treated calcium carbonate filler significantly improves the tensile strength and mechanical properties of polymer compositions, including increased flexural modulus and reduced elongation at break, while maintaining low moisture content.
Implementation Method 1
applying a first layer comprising a first component comprising silicon and at least one hydroxyl group to the surface of the calcium carbonate core by contact of the CaCO3 with an aqueous silicate
Implementation Method 2
The hydroxyl groups that are present on the surface of silane-treated particles can be used to create inter-bonds that strengthen materials
Implementation Method 3
contacting the first treated core with a compound selected from the group consisting of aminosilane, vinylsilane, alkylsilane, aminoalkylsilane, phenylsilane, fluoroalkylsilane to thereby apply a second layer on the surface of the first layer
Data Source
AI summary
The present disclosure relates to a silane treated composition, and a filled polymer composition comprising such silane treated composition and a polymer for improved mechanical properties; the treatment being in two steps, the first being a treatment with an aqueous silicate, followed by a second treatment with a silane-containing compound; optionally including treatment with an aliphatic carboxylic acid prior to the first treatment.