Two-Part Adhesive Composition for Lignocellulosic Composites
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Solution Overview
Problem
Existing processes for manufacturing lignocellulosic-based composites, such as particleboards and oriented strand boards, face challenges including odor issues due to urea in soy flour, energy-intensive denaturation steps, and reduced strength when using soy protein isolate, as well as viscosity problems and water excess in one-step adhesive mixing processes.
Innovation Solution
A two-part adhesive composition using a solid part of ground sunflower or rapeseed meal with a granulometry of less than 300 μm and a liquid part containing an amine-based azetidinium-functional cross-linker and water, where the solid part is added first to the lignocellulosic material, followed by the liquid part, eliminating the need for urea and reducing water usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If soy flour is used as adhesive in a one-step mixing process, then the adhesive properties are achieved, but strong odor and eye irritation occur due to urea release
Solution Approach 1:
The patent removes urea from the adhesive composition entirely, replacing the soy flour-based adhesive system with a novel composition that achieves equivalent or superior adhesive properties without urea-related harmful emissions. This extraction of the harmful component (urea) eliminates odor and eye irritation while maintaining manufacturing ease.
Solution Approach 2:
The patent employs a cost-effective alternative adhesive composition that, while potentially having shorter shelf life or requiring fresh preparation, eliminates the harmful effects of urea. The new composition uses readily available materials to achieve the desired adhesive performance without the drawbacks of traditional soy flour-based systems.
2Object-affected harmful factors
If soy flour is heat-treated to denature urease, then odor issues are reduced, but energy consumption increases and board strength decreases
Solution Approach 1:
Instead of treating soy flour to mitigate urease activity, the patent completely removes urea from the adhesive composition. This eliminates the need for energy-intensive heat treatment steps while avoiding the associated loss in board strength, as the novel adhesive composition achieves effective bonding without urea-based chemistry.
3Device complexity
If all adhesive compounds are mixed together in a one-step process, then the process is simple, but viscosity increases and water addition becomes excessive
Solution Approach 1:
The patent divides the adhesive composition into separate components that are mixed only when needed, rather than pre-mixing all compounds. This segmentation allows control over the timing and amount of water addition, preventing excessive viscosity buildup and reducing total water requirements while maintaining process simplicity through the use of pre-prepared adhesive components.
4Ease of manufacture
If high quantity of water is added in one-step mixing, then the adhesive composition is easy to prepare, but water excess causes issues during hot-pressing
Solution Approach 1:
The patent segments the adhesive preparation into stages, adding water progressively rather than all at once. This controlled water addition prevents excessive moisture that would interfere with hot-pressing, while still maintaining ease of preparation through the use of pre-mixed adhesive concentrates that require minimal water addition at the final stage.
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
This approach enhances the mechanical properties and tack of the composite materials, reduces odor issues, and improves processing efficiency by maintaining lower viscosity and minimizing water excess during the hot-pressing step, resulting in boards that meet or exceed standard performance criteria.
Implementation Method 1
a liquid part comprising an amine-based azetidinium-functional cross-linker
Implementation Method 2
then adding a powdered protein source (soy flour) to the mixture before curing
Data Source
AI summary
The invention relates to a process for preparing an article comprising:i) providing a two-part adhesive composition having a liquid part comprising an amine-based azetidinium-functional cross-linker, a diluent and water, and a solid part comprising ground Helianthus meal or ground Brassica meal or a mixture thereof, having a granulometry d50 of less than 300 μm,ii) adding either the liquid part or the solid part to a lignocellulosic material to provide a mixture, theniii) adding the remaining liquid or solid part to the mixture to provide a lignocellulosic material impregnated with the adhesive composition.