RTV Organopolysiloxane Chain Extender for Faster Moisture Curing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional room-temperature-vulcanizing (RTV) organopolysiloxane compositions of the dealcoholization type exhibit low reactivity with moisture, leading to slow curing speeds, making them impractical for industrial applications.
Innovation Solution
A difunctional hydrolyzable organopolysiloxane compound with α-organooxy-substituted methyl groups and mono-organooxysilyl groups at both molecular chain ends, which undergo rapid hydrolysis and condensation reactions to extend the chain length of a base polymer, forming a silicone rubber elastic body under room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dealcoholization type RTV organopolysiloxane composition is used, then no unpleasant odors are produced and metals are not corroded, but the reactivity with water is low and curing speed is slow
Solution Approach 1:
The patent modifies the chemical structure parameters of the chain extender by introducing α-organooxy-substituted methyl groups and mono-organooxysilyl groups, which change the reactivity parameters while maintaining the dealcoholization curing mechanism that avoids odors and metal corrosion
Solution Approach 2:
The invention creates a composite chain extender structure combining organooxy-substituted methyl groups and mono-organooxysilyl groups within the same molecule, achieving both rapid curing and clean dealcoholization properties
2Ease of operation
If a conventional chain extender is used in dealcoholization type composition, then the composition presents no unpleasant odors, but the curing speed is too slow for industrial applications
Solution Approach 1:
The patent changes the chemical reactivity parameters of the chain extender by incorporating specific functional groups (α-organooxy-substituted methyl and mono-organooxysilyl) that accelerate the hydrolysis and condensation reactions, reducing curing time while maintaining the clean dealcoholization process
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 compound enables rapid conversion into a rubber with rubber elasticity due to moisture, suitable for coating agents, adhesive agents, and sealing agents, with improved reactivity and curing speed.
Implementation Method 1
a difunctional hydrolyzable organopolysiloxane compound... capable of further polymerizing the above base polymer by forming siloxane bonds as a result of undergoing a hydrolysis and condensation reaction
Implementation Method 2
undergoing a hydrolysis and condensation reaction with the end silanol group or hydrolyzable silyl group of such base polymer
Implementation Method 3
forming siloxane bonds as a result of undergoing a hydrolysis and condensation reaction
Data Source
AI summary
Provided is an organopolysiloxane compound acting as a chain extender for use in a room-temperature-vulcanizing (RTV) composition of a dealcoholization type that can be rapidly turned into a rubber and then exhibit a rubber elasticity. The organopolysiloxane compound is represented by the following general formula (1), and also provided is a composition containing this compound and a linear diorganopolysiloxane with both molecular chain ends being blocked by a silanol group or a hydrolyzable silyl group,wherein each of R1, R2, R3 and R4 independently represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms; and n is a number of 0 to 10.