Silicone Resin Dissolving Agent for Base Material Recovery
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Solution Overview
Problem
Existing methods for separating silicone resin from base materials, such as resin or metal, are hindered by the strong adhesion between silicone rubber and base materials, making recycling difficult and posing health and environmental risks due to the use of toxic chemicals.
Innovation Solution
A silicone resin-dissolving agent comprising 1 to 90 mass% of a siliconate compound represented by specific general formulas and 99 to 10 mass% of an aprotic organic solvent with a relative permittivity of 10.0 or less, which effectively dissolves silicone resin and allows for the recovery of base materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If phosphonitrile chloride is used to dissolve silicone rubber, then selective dissolution without swelling plastic members is achieved, but extreme toxicity causes health damage and environmental burden
Solution Approach 1:
The patent changes the chemical parameters of the dissolving agent by replacing phosphonitrile chloride with a silane coupling agent system consisting of organometallic catalyst and silane compound. This parameter substitution maintains the dissolving function while eliminating the extreme toxicity of the original agent.
Solution Approach 2:
The patent employs a disposable dissolving agent system that can be used once and then discarded or neutralized, replacing the persistent toxic phosphonitrile chloride. The organometallic catalyst and silane compounds can be decomposed or neutralized after use, reducing long-term environmental burden.
2Object-affected harmful factors
If alkylbenzenesulfonic acid and hydrochlorofluoroolefin are used to dissolve silicone rubber, then environmental burden is reduced, but strong acidity causes corrosion and cannot be used with acid-sensitive base materials
Solution Approach 1:
The patent changes the pH parameter of the dissolving system by using a neutral or mildly acidic organometallic catalyst system instead of strong acid. This allows the dissolving agent to be compatible with acid-sensitive base materials like certain plastics and metals while still effectively dissolving silicone rubber.
Solution Approach 2:
The silane coupling agent acts as an intermediary that bridges the organometallic catalyst and silicone rubber, enabling selective dissolution through siloxane bond cleavage without requiring strong acid. This intermediary mechanism provides versatility across different base material types.
3Manufacturing precision
If strong-alkaline solution with pH 13 or more is used to separate silicone rubber from base fabric, then separation is achieved, but long-term treatment damages dissolution equipment and cannot be used with alkalinity-sensitive resin base materials
Solution Approach 1:
The patent changes the pH parameter from strongly alkaline (pH 13+) to neutral or mildly acidic conditions by using an organometallic catalyst system. This eliminates equipment corrosion and damage to alkalinity-sensitive base materials while maintaining effective separation capability through silane-mediated siloxane bond cleavage.
4Manufacturing precision
If alkylbenzene sulfonic acid and saturated hydrocarbon are used to dissolve silicone rubber, then dissolution is achieved, but strong acidity causes equipment corrosion and health damage
Solution Approach 1:
The patent changes the chemical composition parameters by replacing alkylbenzene sulfonic acid with an organometallic catalyst (such as aluminum alkoxide or titanium alkoxide) combined with silane coupling agent. This parameter substitution eliminates strong acidity while preserving dissolution capability through alternative chemical mechanisms.
Solution Approach 2:
The organometallic catalyst system can be used in small amounts and decomposed or neutralized after use, replacing persistent strong acids. This reduces long-term equipment corrosion and health risks associated with handling and storing strong acidic dissolving agents.
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 proposed solution enables efficient dissolution of silicone resin from integrated molded products, facilitating the recovery of base materials and reducing environmental and health hazards associated with toxic chemical use.
Implementation Method 1
a silicone resin-dissolving agent comprising: (A) 1 to 90 mass% of a siliconate compound
Implementation Method 2
99 to 10 mass% of an aprotic organic solvent having a relative permittivity of 10.0 or less
Data Source
AI summary
The present invention is a silicone resin-dissolving agent including a siliconate compound (A) represented by the formula (1) and/or the formula (2) and an aprotic organic solvent (B) having a relative permittivity of 10.0 or less. In the formulae, R independently represents a group selected from an alkyl group having 1 to 10 carbon atoms and an aryl group having 6 to 10 carbon atoms, which may be substituted with a halogen atom; M represents a cationic species selected from an alkali metal ion, a tetraalkylammonium ion, a benzyltrialkylammonium ion, and a tetraalkylphosphonium ion; and "n" represents an integer of 0 to 200. By the present invention, it is possible to provide a silicone resin-dissolving agent for recovering a base material from an integrated molded product of a silicone resin such as a silicone rubber and a resin base material or a metal base material by dissolving the silicone resin.