Pea Seed Adhesive Composition for Low-Viscosity Fast Curing
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Solution Overview
Problem
Protein-based adhesive compositions used in the lignocellulosic industry face high viscosity issues, leading to processability problems and requiring complex industrial implementation, and have long pressing times, which are not compatible with industrial use.
Innovation Solution
An adhesive composition comprising ground pea seeds and an amine-based azetidinium-functional cross-linker is used, which improves processability by maintaining a high solid content and reduces viscosity, allowing for fast curing times and efficient production of lignocellulosic-based composites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If protein-based adhesive composition is used to maintain high solid content, then adhesive strength is improved, but viscosity increases leading to processability problems
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by introducing a specific crosslinking agent (polyamidoamine-epichlorohydrin resin) and controlling pH levels (adjusting to pH 8-10), which modifies the rheological properties of the protein-based adhesive. This allows the adhesive to maintain high solid content (improving strength) while achieving acceptable viscosity through chemical modification and pH control
Solution Approach 2:
The patent creates a composite adhesive system combining proteinaceous powder (soy flour, pea flour, or wheat gluten flour) with polyamidoamine-epichlorohydrin resin and optional polyols. This composite formulation synergistically improves both adhesive strength and processability, as the resin component modifies the viscosity characteristics while the protein provides bonding strength
2Strength
If protein-based adhesive composition is used to maintain high solid content, then adhesive strength is improved, but pressing time increases making it incompatible with industrial use
Solution Approach 1:
The patent utilizes pH adjustment (to pH 8-10) and the addition of polyamidoamine-epichlorohydrin resin to accelerate the curing kinetics of the protein-based adhesive. This chemical modification enables the adhesive to achieve adequate bond strength within industrial pressing times (typically 3-10 minutes at elevated temperatures), resolving the contradiction between maintaining high solid content and reducing pressing time
Solution Approach 2:
The patent employs polyamidoamine-epichlorohydrin resin as a crosslinking agent that accelerates the adhesive curing process through chemical crosslinking reactions. This acceleration mechanism enables high solid content adhesives to cure rapidly under pressing conditions, making the process compatible with industrial productivity requirements
3Strength
If sequential combination of components is used to improve tack/green strength, then adhesive performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functional components into a single adhesive composition formulation: proteinaceous powder provides base adhesive properties, polyamidoamine-epichlorohydrin resin provides crosslinking and acceleration, and optional polyols provide plasticity and water resistance. This combined formulation achieves improved tack and green strength while simplifying the application process to a single-step coating operation, eliminating the need for multiple sequential application devices
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 enables the production of lignocellulosic-based composites with excellent adhesive properties and short pressing times, simplifying industrial processes and reducing production costs.
Implementation Method 1
an amine-based azetidinium-functional cross-linker
Data Source
AI summary
The invention relates to an adhesive composition comprising:ground pea seeds comprising between 5 wt % and 40 wt % of crude proteins on the total weight of the ground pea seeds,an amine-based azetidinium-functional cross-linker, andwater.The invention also relates to an article and its preparation process, use of the adhesive composition according to the invention, and use of ground pea seeds.