Moisture-Curable Silicone Composition Without Oxime Release
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Solution Overview
Problem
Existing high-temperature sealing products based on moisture curable organopolysiloxanes release harmful oximes during curing, posing health and environmental risks, and require improved adhesion, elasticity, and curing speed.
Innovation Solution
A curable composition using organyloxy group containing organopolysiloxanes combined with pigments, surface modified calcium carbonate, and optional fillers, catalysts, and stabilizers, which do not rely on oxime-releasing curing mechanisms, enhancing adhesion, elasticity, and curing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxime releasing crosslinking compounds are used to achieve high temperature stability, then the robustness of the polymeric siloxane network is improved, but harmful oximes are released to the environment during curing
Solution Approach 1:
The patent extracts and removes the harmful oxime releasing crosslinking compounds from the formulation while retaining the high temperature stability functionality through alternative crosslinking mechanisms using organyloxy group containing polyorganosiloxanes that cure without releasing harmful substances
Solution Approach 2:
The patent introduces alternative crosslinking agents and catalysts as intermediaries to achieve the crosslinking reaction and high temperature stability without using oxime releasing compounds, thereby mediating between the need for robust network formation and environmental safety
2Strength
If conventional moisture curable organopolysiloxanes are used, then adhesion properties are achieved, but curing speed and elasticity are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the polysiloxane structure by introducing organyloxy groups with specific molecular weights and structures, and adjusts the formulation parameters including catalyst selection and filler content to simultaneously improve adhesion, curing speed, and elasticity
3Reliability
If high temperature stability is achieved through traditional formulations, then resistance to aggressive media is improved, but health and environmental risks increase due to oxime release
Solution Approach 1:
The patent converts the potentially harmful oxime release mechanism into a beneficial alternative crosslinking mechanism that maintains or improves high temperature stability and resistance to aggressive media while eliminating harmful emissions, thereby turning a harmful process into a beneficial one
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 composition achieves high-temperature stability without releasing oximes, improving adhesion and elasticity, and increasing curing speed, suitable for household and industrial devices.
Implementation Method 1
In the presence of atmospheric moisture these alkoxysilane polymers are able to condense with elimination of the alkoxy groups
Implementation Method 2
these compositions are preferably thixotropic and non-sagging
Data Source
AI summary
The invention relates to a curable composition, adhesive, sealant, and/or coating materials comprising said composition and methods of using said composition, wherein the curable composition comprises:I. organyloxy group containing organopolysiloxanes comprising(A) organopolysiloxane(s) containing organyloxy groups and consisting of units of the formula (I) and/or their partial hydrolysates,(B) organosilicon compound(s) of the formula (II)(C) organosilicon compound(s) containing basic nitrogen, of the formula (III) and/or their partial hydrolysates, andoptionally (D) organosilicon compound(s) of the formula (IV)and/or their partial hydrolysates,where R, R1, R2, a, b, c, R3, R4, d, R5, R6, e, R7, R8 and h are defined as stated in the specification,II. a first pigment,III. a second pigment,IV. optionally surface treated silica,V. surface treated calcium carbonate,VI. optionally a Cerium (III) additive,VII. optionally a tin catalyst.