Resin-Linear Organosiloxane Block Copolymer Emulsions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resin-linear organosiloxane copolymers are difficult to prepare due to incompatibility between linear and resinous blocks, leading to inferior mechanical properties and heterogeneous materials with unreacted fractions and cloudy compositions.
Innovation Solution
Aqueous silicone emulsions of resin-linear organosiloxane block copolymers are formed by mixing organosiloxane block copolymers with emulsifiers and water, followed by shear mixing, resulting in transparent, weather-resistant coatings with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If base condensation or acid/metal catalyzed reactions are used to link linear and resinous blocks, then the copolymer can be formed, but unreacted material remains and mechanical properties deteriorate
Solution Approach 1:
The patent introduces a silane crosslinking agent as an intermediary substance that reacts with hydroxyl groups on both linear and resinous blocks to form crosslinks. This mediator enables complete reaction between incompatible blocks without leaving unreacted material, thereby achieving both ease of manufacture and high mechanical properties.
Solution Approach 2:
The patent creates a composite structure by combining linear siloxane blocks, resinous siloxane blocks, and silane crosslinking agents into a single copolymer system. This composite approach allows the incompatible components to work together through crosslinking, producing a material with superior mechanical properties while maintaining manufacturability.
2Ease of manufacture
If linear polydimethysiloxane blocks are combined with resinous silsesquioxane blocks, then copolymer can be synthesized, but the material becomes heterogeneous and cloudy
Solution Approach 1:
The silane crosslinking agent acts as a bridge that uniformly connects linear and resinous blocks throughout the polymer matrix. This intermediary ensures homogeneous distribution and reaction of all components, eliminating the heterogeneous and cloudy appearance that would otherwise result from direct combination of incompatible blocks.
Solution Approach 2:
The patent changes the chemical parameters of the system by introducing silane crosslinking functionality. This parameter change transforms the interaction between linear and resinous blocks from incompatible to compatible, resulting in a homogeneous, clear material while maintaining ease of synthesis through standard condensation reactions.
3Ease of manufacture
If conventional copolymerization methods are used, then resin-linear copolymer can be prepared, but the material shows inferior mechanical properties
Solution Approach 1:
The silane crosslinking agent serves as a mediator that enhances the mechanical properties of the copolymer by forming a three-dimensional crosslinked network. This intermediary substance allows conventional preparation methods to yield a material with superior strength and elasticity, resolving the contradiction between ease of manufacture and mechanical performance.
Solution Approach 2:
The patent employs a composite material system combining linear blocks, resinous blocks, and crosslinking agents. This composite structure leverages the advantages of each component to achieve both easy preparation through standard methods and enhanced mechanical properties through the synergistic crosslinked network.
4Stability of the object's composition
If aqueous emulsion is used to stabilize resin-linear copolymer, then shelf stability is achieved, but the coating may not form transparent films
Solution Approach 1:
The silane crosslinking agent acts as an intermediary that enables complete reaction and uniform distribution within the aqueous emulsion system. This mediator ensures that the copolymer forms a homogeneous, transparent film after drying while maintaining the shelf stability provided by the aqueous emulsion formulation.
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 process produces transparent coatings with high optical clarity and tensile strength, providing shelf stability and ease of application while maintaining mechanical integrity.
Implementation Method 1
aqueous silicone emulsions of resin-linear organosiloxane block copolymers are formed by mixing organosiloxane block copolymers with emulsifiers and water
Implementation Method 2
admixing a sufficient amount of water to the mixture to form an emulsion, and optionally further shear mixing the emulsion
Data Source
AI summary
The present disclosure provides aqueous silicone emulsions of a “resin-linear” organosiloxane block copolymers. The present disclosure further provides a process for making these emulsions by forming a mixture of an organosiloxane block copolymer, admixing a sufficient amount of water to the mixture from to form an emulsion, and optionally further shear mixing the emulsion. The present invention further relates to the cured and/or coating compositions prepared from the present emulsions.