Hybrid Adhesive Composition for Wood-Based Materials

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Solution Overview

Problem

Urea-based adhesives used in wood-based materials production exhibit low moisture resistance, brittleness, and poor compatibility with other adhesives, leading to inferior bonding quality and increased formaldehyde emissions.

Innovation Solution

A hybrid adhesive composition combining amino resins, such as urea resin, with polyethers and isocyanates, which improves miscibility, elasticity, and chemical stability, and reduces brittleness and formaldehyde emissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If urea resins are used as adhesives for wood-based materials, then cost is reduced and dry bonding strength is improved, but moisture resistance deteriorates and bonding quality becomes inferior

Engineering Contradiction:

ImprovecostVSAvoidmoisture resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies composite materials by combining urea resin with polyether and isocyanate to create a hybrid adhesive system. This composite approach integrates the cost-effectiveness and initial bonding strength of urea resin with the moisture resistance and flexibility of polyether-isocyanate components, resolving the contradiction between low cost and moisture resistance.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If urea resins are used as adhesives, then cost is reduced, but brittleness increases and bonding quality deteriorates

Engineering Contradiction:

ImprovecostVSAvoidbonding quality

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The hybrid adhesive combines urea resin with polyether-isocyanate composite to create a material that maintains the cost advantage of urea resin while gaining the flexibility and bonding quality of the polyether component, thereby resolving the contradiction between cost and bonding quality.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the chemical composition parameters by introducing polyether and isocyanate into the urea resin system. This parameter modification transforms the brittle urea resin into a more flexible hybrid adhesive with improved bonding quality while maintaining cost-effectiveness.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If urea resins are used as adhesives, then cost is reduced, but formaldehyde emissions increase

Engineering Contradiction:

ImprovecostVSAvoidformaldehyde emissions

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful formaldehyde emission issue into a benefit by using isocyanate to react with and trap formaldehyde released by urea resin. The isocyanate forms stable urea linkages with formaldehyde, transforming the harmful emission into a stable chemical structure that improves both air quality and adhesive performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Reliability

If urea resins are combined with other adhesives to improve properties, then moisture resistance and bonding quality improve, but incompatibility problems arise and mixing becomes difficult

Engineering Contradiction:

Improvemoisture resistanceVSAvoidmixing compatibility

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses polyether as an intermediary substance that mediates between urea resin and isocyanate. The polyether provides a compatible medium that allows thorough mixing and homogeneous distribution of components, preventing phase separation and incompatibility issues while enabling the moisture resistance benefits of the hybrid system.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 hybrid adhesive composition enhances bonding quality, increases moisture resistance, and reduces formaldehyde emissions, while allowing for faster curing and improved compatibility with other adhesives, resulting in more stable and durable wood-based materials.

Implementation Method 1

the polyether improves the miscibility of amino resins with other adhesives

Methodology Applied

Scientific EffectMiscibility improvement:

Implementation Method 2

Urea resins belong to the group of duromers that harden via a polycondensation reaction

Methodology Applied

Scientific EffectPolycondensation reaction:

Implementation Method 3

reduces formaldehyde emissions

Methodology Applied

Scientific EffectFormaldehyde emission reduction:

Data Source

PatentEP2791244B1Adhesive compounds and use of same

Publication Date: 2016.05.11 SWISS KRONO TEC AG

Figure 1

AI summary

The present invention relates to novel formulations for adhesive compositions and to adhesive compositions, especially for a hybrid adhesive comprising at least one mixture of an amino resin and at least one polyether, and to the combination of this mixture with isocyanate and to the use of polyethers in adhesives based on amino resins. These adhesive compositions are especially suitable for use as adhesives for woodbase materials, especially OSB sheets, fiberboard or particleboard. In a further aspect, the present invention relates to processes for producing such woodbase materials from lignocellulose-containing comminution products, especially to processes for producing OSB sheets, wood fiberboard or particleboard, wherein the lignocelluloses-containing comminuation products are contacted with the inventive adhesive composition and then the woodbase materials are obtained by pressing with heat treatment. Finally, the present invention is directed to correspondingly obtainable woodbase materials.