Curable Composition Water-Resistant Adhesiveness Wood
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Solution Overview
Problem
Current organic polymers with reactive silicon groups face challenges in achieving high water-resistant adhesiveness, particularly on porous base materials like wood, which is essential for meeting D4 class standards in Europe's wood adhesives, as they tend to lose adhesiveness after water resistance tests.
Innovation Solution
A curable composition combining a polyoxyalkylene-based organic polymer with reactive silicon groups and a cyclic N-hydroamide compound, specifically 2-pyrrolidinone, is developed, which enhances the water-resistant adhesiveness by forming a strong adhesion layer when used with a binding product of kaolinite and quartz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic polymers with reactive silicon groups are used for adhesive applications on porous base materials like wood, then initial adhesion can be achieved, but water-resistant adhesiveness deteriorates after water resistance tests
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive system by introducing specific cyclic N-hydroamide compounds (2-pyrrolidinone, 3-hydroxy-2-pyrrolidinone, or 4-hydroxy-2-pyrrolidinone) at controlled concentrations (1-10 wt%, preferably 3-8 wt%) relative to the organic polymer. This parameter change transforms the adhesive's performance characteristics, enabling it to maintain strong adhesion on porous wood surfaces even after water resistance tests, thereby resolving the contradiction between initial adhesion and water-resistant adhesiveness
Solution Approach 2:
The patent creates a composite adhesive system by combining organic polymers with reactive silicon groups and cyclic N-hydroamide compounds. This composite formulation synergistically integrates the polymer matrix with the cyclic N-hydroamide additive, producing an adhesive composition that simultaneously achieves reliable initial adhesion and superior water-resistant adhesiveness on porous base materials like wood, overcoming the limitations of conventional single-component adhesives
2Strength
If adhesive formulations are optimized for high initial strength, then initial adhesion improves, but water resistance performance worsens
Solution Approach 1:
The patent adjusts the compositional parameters by incorporating cyclic N-hydroamide compounds at optimized concentrations (1-10 wt%, preferably 3-8 wt%) within the adhesive formulation. This parameter modification enables the adhesive to achieve both high initial adhesion strength and superior water resistance performance simultaneously, resolving the trade-off between initial strength and water resistance reliability
Solution Approach 2:
The cyclic N-hydroamide compound acts as an intermediary substance that mediates between the organic polymer matrix and the porous wood substrate. This intermediary component facilitates strong initial adhesion while simultaneously providing water resistance protection, thereby resolving the contradiction between achieving high initial strength and maintaining water resistance 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 curable composition produces a cured product with high initial strength and favorable adhesiveness even after water resistance tests, effectively addressing the limitations of existing technologies by improving adhesion on wood surfaces.
Implementation Method 1
An organic polymer containing at least one reactive silicon groups in a molecule undergoes, even at room temperature, hydrolysis of a silyl group due to moisture and the like
Implementation Method 2
forms a siloxane bond according to a condensation reaction
Data Source
AI summary
Provided is a room-temperature-curable composition containing reactive silicon-containing groups, in particular, a curable composition which gives a cured object satisfactory in terms of initial adhesiveness to wood and water-resistant adhesiveness thereto and which is reduced in burden on the environment or human body. A curable composition comprising an organic polymer (A) containing reactive silicon-containing groups and a cyclic N-hydroamide compound (B) which includes a cyclic structure wherein the number of ring-constituting atoms is 6 or less and which has a carboxamide bond (-CONH-) within the cyclic structure gives excellent adhesion strength when used especially as an adhesive for wood. The satisfactory shear strength can be maintained even after a water resistance test.