Starch-Based Adhesive Composition with Amine Polymers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Starch-based adhesive compositions face challenges with high viscosity at moderate dry contents, making them difficult to handle and store, and they often result in poor gluing properties such as low bond strength and significant 'spring back' in compression-moulded products.
Innovation Solution
A starch-based adhesive composition is developed with at least partly gelatinised starch and polymers containing a primary amine group, which is mixed at elevated temperatures to achieve a high solids content while maintaining low viscosity, improving storage stability and gluing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If starch-based adhesive compositions use moderate dry content, then viscosity remains low and handling is easy, but gluing properties deteriorate with low bond strength and high spring back
Solution Approach 1:
The invention changes the chemical composition parameters by introducing specific polymer additives (polyvinyl alcohol and/or polyacrylamide) to the starch-based adhesive system. This allows the adhesive to maintain low viscosity at high dry content (50-70%) while achieving excellent bond strength and low spring back, resolving the contradiction between handling ease and gluing strength
Solution Approach 2:
The invention creates a composite adhesive system combining starch with synthetic polymers (polyvinyl alcohol and/or polyacrylamide). This composite formulation synergistically combines the advantages of both components: starch provides natural adhesion and the polymers provide viscosity control and strength enhancement, enabling simultaneous achievement of easy handling and high bond strength
2Strength
If starch-based adhesive compositions increase dry content to improve gluing properties, then viscosity increases making spreading difficult
Solution Approach 1:
The invention modifies the rheological parameters of the adhesive by adding polymer additives that act as viscosity modifiers. These polymers allow the formulation to maintain low viscosity even at high dry content levels (50-70%), enabling easy spreading while achieving superior gluing quality
Solution Approach 2:
The polymer additives (polyvinyl alcohol and/or polyacrylamide) serve as intermediary substances that mediate between starch molecules, preventing excessive viscosity buildup while maintaining adhesive functionality. These intermediaries allow high solid content without sacrificing applicability
3Stability of the object's composition
If partially gelatinised starch contains un-gelatinised particles, then storage stability deteriorates due to settling, but complete gelatinisation requires high energy input
Solution Approach 1:
The invention optimizes the gelatinisation parameters by controlling temperature and time to achieve partial gelatinisation that prevents settling while minimizing energy consumption. The polymer additives also stabilize the starch particles in suspension, allowing storage stability without complete gelatinisation
Solution Approach 2:
The polymer additives self-stabilize the starch suspension through steric hindrance and electrostatic repulsion, preventing particle settling during storage. This self-stabilizing mechanism eliminates the need for complete gelatinisation or additional stabilizing agents, reducing overall energy requirements
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 adhesive composition achieves excellent bond strength, low spring back, and shape retention during load, as demonstrated by improved performance in fatigue tests and fiber tear resistance.
Implementation Method 1
at least partly gelatinised starch
Implementation Method 2
adhesive composition... for gluing wood based materials
Data Source
AI summary
The invention relates to an adhesive composition comprising at least partly gelatinised starch and one or more polymers (P) containing an amine group or an amide group. It also relates to a method of gluing pieces of wood based materials and to a wood based product.