Two-Part Moisture-Curable Resin for Rapid Green Strength
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Solution Overview
Problem
Moisture-curable resin compositions used as adhesives and sealants often require extended cure times and have limited shelf life, which can hinder production efficiency and storage stability, especially in applications like window assembly where rapid green strength development and long-term stability are desired.
Innovation Solution
A two-part moisture-curable resin composition comprising a first part with a moisture-curable silylated resin and a second part containing water, along with additional components like plasticizers and surfactants, which allows for rapid hydrolysis and condensation upon mixing, providing quick green strength and extended shelf stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If moisture-curable resin compositions are used as adhesives and sealants, then bond strength and sealing performance are achieved, but cure time is extended and shelf life is limited
Solution Approach 1:
The composition is divided into two separate parts: Part A containing the silylated resin and Part B containing water and catalyst. This segmentation prevents premature reaction during storage while enabling rapid curing when mixed. The hydrolysis and condensation reactions occur quickly once the两部分 are combined, significantly reducing cure time while maintaining bond strength.
Solution Approach 2:
The silylated resin is pre-synthesized with alkoxy groups attached to the silane moieties. This preliminary preparation of the resin structure allows for immediate hydrolysis and condensation upon contact with water, eliminating the need for extended cure times while achieving full bond strength.
2Duration of action of stationary object
If moisture-curable resin compositions are stored for extended periods, then shelf life is improved, but chemical stability deteriorates due to moisture absorption
Solution Approach 1:
By separating the moisture-sensitive silylated resin (Part A) from water (Part B), the system prevents premature hydrolysis during storage. Each part remains chemically stable on its own, and the reaction only initiates upon intentional mixing, thereby extending shelf life without compromising chemical stability.
Solution Approach 2:
The silylated resin in Part A is formulated to be moisture-free and can be stored in inert or controlled environments. The alkoxy groups on the silane remain intact until deliberate exposure to water, maintaining compositional stability throughout the extended shelf life period.
3Productivity
If rapid green strength development is achieved, then production line speed is improved, but shelf stability may be compromised
Solution Approach 1:
The two-part formulation separates the reactive silylated resin from water and catalyst, preventing premature crosslinking during storage. When mixed, the pre-prepared alkoxy groups enable immediate hydrolysis and rapid condensation, achieving fast green strength development without compromising shelf stability of the individual components.
Solution Approach 2:
The silylated resin is specifically designed with alkoxy groups that are stable during storage but rapidly hydrolyze upon water contact. This parameter change in reactivity allows the system to maintain shelf stability while enabling rapid green strength development when the两部分 are combined.
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 two-part composition enables faster production line speeds and extended storage capabilities, allowing for handling and shipping of assembled constructions without deformation, while maintaining performance for up to 18 months without significant chemical changes.
Implementation Method 1
water, either as water vapor or liquid water, reacts with, i.e., hydrolyzes, an alkoxysilane group to form a silanol group
Implementation Method 2
reaction, or condensation, of the silanol group with the silanol group of another similarly hydrolyzed alkoxysilane molecule resulting in the formation of numerous crosslinks
Data Source
AI summary
A two-part moisture-curable resin composition comprises: a) a first part substantially free of moisture comprising: (1) moisture-curable silylated resin and, (2) optionally, one or more additional components selected from the group consisting of plasticizer, solvent, thixotropic agent, particulate material, moisture scavenger, isocyanate scavenger, crosslinker, adhesion promoter, U.V. stabilizer and antioxidant; and, b) a second part comprising: (1) water in an amount sufficient to cure moisture-curable silylated resin (a)(1); (2) at least one plasticizer and/or particulate material, (3) nonionic surfactant in an amount sufficient to provide a stable emulsion of plasticizer (b)(2), if present, and a stable suspension of particulate material (b)(2), if present, (4) optionally, one or more additional components selected from the group consisting of solvent, thixotropic agent, pH adjuster, U.V. stabilizer and antioxidant, provided, the first part and/or the second part further comprises catalyst (c) for the condensation reaction of hydrolyzed moisture-curable silylated resin (a)(1).