Silane-Modified Polyether Sealant for Prefabricated Buildings
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Solution Overview
Problem
Current two-composition low-modulus silane-modified polyether sealants for prefabricated buildings lack adhesion to substrates, relying on priming coatings for adhesion, which complicates the application process and risks water leakage, and have slow deep-layer curing issues.
Innovation Solution
A two-composition silane-modified polyether sealant formulation comprising silane-modified polyether, plasticizer, hydroxy-terminated branched polyether, branched polyether epoxy resin, and other additives, which allows simultaneous curing and enhances adhesion to substrates without the need for priming coatings, improving deep-layer curing speed and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If one-composition silane-modified polyether sealant is used, then the sealant has low modulus and good flexibility, but the deep-layer curing speed is slow
Solution Approach 1:
The sealant is divided into two compositions: Composition A (base paste) containing silane-modified polyether, silane crosslinking agent, and other additives; Composition B (curing agent) containing polyamide curing agent. This segmentation allows independent optimization of each component's function while achieving fast deep-layer curing through chemical reaction between the two compositions.
Solution Approach 2:
The patent changes the curing mechanism parameter from moisture-dependent (one-composition) to chemical reaction-driven (two-composition). By introducing a polyamide curing agent that reacts with silane groups, the curing speed is dramatically increased without affecting the low modulus property, resolving the contradiction between composition stability and curing speed.
2Speed
If two-composition silane-modified polyether sealant is used, then the deep-layer curing speed is fast, but the adhesion to substrate is poor
Solution Approach 1:
The patent creates a composite material system combining silane-modified polyether (providing low modulus and flexibility) with polyamide curing agent (providing fast curing and adhesion). The synergistic interaction between these components produces a sealant that simultaneously achieves fast deep-layer curing and strong substrate adhesion without requiring priming coatings.
Solution Approach 2:
The silane crosslinking agent acts as an intermediary that bridges the silane-modified polyether and polyamide curing agent. It reacts with both components to form a crosslinked network structure that provides both fast curing and strong adhesion to substrates, resolving the contradiction between curing speed and adhesion strength.
3Strength
If priming coating is applied to improve adhesion, then the adhesion to substrate improves, but the application process becomes more complicated
Solution Approach 1:
The patent merges the adhesion function into the sealant composition itself by incorporating specific additives and crosslinking agents that provide inherent bonding capability to substrates. This eliminates the need for separate priming coating application, simplifying the overall process while maintaining strong adhesion.
Solution Approach 2:
The sealant formulation is designed to be self-priming, meaning it contains all necessary components for both adhesion and curing within the two-composition system. The sealant automatically adheres to substrates upon application without requiring external priming agents or additional processing steps.
4Strength
If priming coating is used to achieve adhesion, then the adhesion improves, but the risk of water leakage increases
Solution Approach 1:
The patent extracts and eliminates the priming coating step from the application process. By incorporating adhesion-promoting components directly into the sealant formulation, it removes the interface between priming coating and sealant that could potentially fail, thereby reducing water leakage risk while maintaining strong adhesion.
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 sealant achieves fast deep-layer curing and strong adhesion to prefabricated building components, eliminating the need for priming coatings and reducing the risk of water leakage, while simplifying the application process and reducing environmental and health hazards.
Implementation Method 1
silane-modified polyether sealant... cured by using its own water... exterior and interior of the sealant layer are simultaneously cured
Implementation Method 2
cured by using its own water... deep-layer curing speed
Data Source
AI summary
A low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings is provided by including a composition A and a composition B, wherein the composition A includes silane-modified polyether, plasticizer, hydroxy-terminated branched polyether, branched polyether epoxy resin, coupling agent, thixotropic agent, silica, reinforcing filler A, hollow glass microspheres and toner, and the composition B includes plasticizer, hydroxy-terminated branched polyether, light stabilizer, reinforcing filler B, organotin catalyst and amine curing agent. The present disclosure also optimized the various ingredients in the silane-modified polyether sealant, and a formulation of sealant having the best bonding effect was obtained. The two-composition polyether sealant system has good compatibility, greatly improves the adhesive properties thereof, achieves a good adhesion and waterproofing effect without needing to be used with a priming coating, and also avoids the risk of water leakage caused by misoperation in the applying of the priming coating existing in the prior art.