Aqueous Bonding Composition for Wood Materials
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Solution Overview
Problem
Existing aqueous adhesives for wood-based materials often fall short in achieving balanced performance in bending strength, wet bending strength, water-absorption thickness expansion coefficient, and peeling strength, while also requiring higher temperatures for bonding, and can clog injection devices due to component incompatibility.
Innovation Solution
An aqueous bonding composition comprising a saccharide, a water-soluble synthetic resin, specifically a polyvinyl alcohol-based compound, and an inorganic acid ammonium salt, such as ammonium dihydrogen phosphate or ammonium chloride, which allows for bonding at lower temperatures and improves compatibility, enabling efficient spraying without clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional aqueous adhesives are used for bonding wood-based materials, then the bonding can be performed at lower temperatures, but the bending strength, wet bending strength, water-absorption thickness expansion coefficient, and peeling strength are unsatisfactory
Solution Approach 1:
The invention uses a composite adhesive system combining urea resin or phenol resin with starch and sodium hydroxide. This composite approach allows the adhesive to achieve both low-temperature bonding capability and high mechanical strength properties, resolving the contradiction between bonding temperature and strength performance
Solution Approach 2:
The invention optimizes specific parameters including the starch content (5-50 wt% of total adhesive), sodium hydroxide concentration (0.5-5 wt% of starch), and moisture content (30-70%) to achieve the desired balance between low bonding temperature and high strength properties
2Strength
If the adhesive composition is complex to improve performance, then the bonding performance is enhanced, but the injection device may clog due to poor component compatibility
Solution Approach 1:
The invention controls the moisture content of the adhesive composition within 30-70% and maintains specific concentration ranges for starch and sodium hydroxide, which prevents component incompatibility and clogging while preserving enhanced bonding performance
Solution Approach 2:
The invention uses different starch types (corn starch, potato starch, tapioca starch) with specific properties suited for different application requirements, optimizing both performance and sprayability for specific use cases
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 enhances the wood-based material's performance balance in bending strength, wet bending strength, water-absorption thickness expansion coefficient, and peeling strength, while allowing for low-temperature bonding and easy application, making it suitable for producing high-quality wood-based materials efficiently.
Implementation Method 1
an aqueous bonding composition comprising a saccharide, a water-soluble synthetic resin, and a specific ammonium salt of an inorganic acid
Implementation Method 2
a water-soluble synthetic resin, specifically a polyvinyl alcohol-based compound
Data Source
AI summary
Disclosed is an aqueous bonding composition comprising: (A) a saccharide; (B) a water-soluble synthetic resin; and (C) an inorganic acid ammonium salt, wherein the inorganic acid ammonium salt (C) comprises at least one selected from ammonium dihydrogen phosphate and ammonium chloride. The water-soluble synthetic resin (B) preferably comprises a polyvinyl alcohol-based compound. A wood-based material obtainable by using the aqueous bonding composition is also disclosed. The aqueous bonding composition is useful for improving performances such as bending strength, bending strength under wet condition, water-absorption thickness expansion coefficient, and peeling strength of a wood-based material in a balanced manner while the composition is capable of bonding at a comparatively low temperature and each component of the composition is excellent in compatibility.