Moisture-Curable Silylated Polymer with Free Polyols
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Moisture-curable polymers with urethane groups have high viscosity, requiring additional plasticizers and fewer fillers, leading to more expensive sealant products.
Innovation Solution
A moisture-curable silylated polymer composition is developed by mixing silylated polymers with polyols and a catalyst, which reacts with moisture to achieve lower viscosity and improved physical properties such as elongation, tensile strength, and hardness, while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture-curable polymers with urethane groups are used, then curability and adhesion are improved, but viscosity increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating silane-terminated polyurethane prepolymers with specific molecular weights (1,000-50,000) and silane content (5-50% by weight), along with polyols having specific hydroxyl values, to achieve the desired balance between curability and viscosity reduction
Solution Approach 2:
The patent creates a composite moisture-curable composition by combining silane-terminated polyurethane prepolymers with polyols, forming a hybrid system that leverages the reactive silane groups for crosslinking (curability) while the polyol component maintains lower viscosity, eliminating the need for excessive plasticizers
2Stress or pressure
If higher amounts of plasticizer are added to reduce viscosity, then application viscosity is improved, but product cost increases
Solution Approach 1:
The patent changes the formulation parameters by using silane-terminated polyurethane prepolymers with controlled molecular weight and silane content, combined with polyols of specific hydroxyl values, to inherently achieve lower viscosity without relying on high amounts of plasticizers, thus reducing material costs
Solution Approach 2:
The patent replaces expensive plasticizers with a cost-effective polyol component that serves the dual function of viscosity control and active participation in the moisture-curable crosslinking reaction, providing economic benefits without sacrificing performance
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 results in efficient, economical low viscosity coatings, sealants, and adhesives with enhanced physical properties, suitable for various applications without the need for excessive plasticizers or fillers.
Implementation Method 1
moisture-curable silylated polymer composition which reacts with moisture
Implementation Method 2
silylated polymers react with the polyols to provide efficient and economical low viscosity coatings, sealants and adhesives
Implementation Method 3
mixing the aforementioned silylated polymer (a) with at least one polyol (b) and a catalyst (c)
Data Source
AI summary
The present invention relates to moisture-curable silylated polymers having unreacted or "free" hydroxyl groups prior to cure with improved physical properties, lower viscosity and lower cost, suitable for preparing coatings, adhesives and sealants.