Polyamine Binder Composition for Lignocellulose Composites
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Solution Overview
Problem
Existing binder compositions for lignocellulose-based composite articles often require high formaldehyde and isocyanate content, leading to environmental concerns and suboptimal mechanical properties and swelling values.
Innovation Solution
A binder composition comprising polymer(s) A1 with primary and/or secondary amino groups and component B1, which is 1,3-dihydroxyacetone, glycolaldehyde, or glyceraldehyde, allowing for reduced formaldehyde and isocyanate usage while maintaining good mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional binder compositions (phenol formaldehyde, urea formaldehyde, isocyanates) are used, then good mechanical properties and bonding strength are achieved, but high formaldehyde and isocyanate content causes environmental concerns and health issues
Solution Approach 1:
The invention changes the chemical composition parameters by replacing formaldehyde and isocyanate with alternative binders comprising polyamines (with specific nitrogen content ≥1 wt.-%) and carbohydrate components (1,3-dihydroxyacetone, glycolaldehyde, and/or glyceraldehyde). This parameter substitution eliminates harmful substances while maintaining bonding performance through the reactive amino groups that form crosslinked structures with lignocellulosic materials.
Solution Approach 2:
The invention uses a composite binder system combining polyamines with specific carbohydrate components (1,3-dihydroxyacetone, glycolaldehyde, and/or glyceraldehyde). This composite approach creates a synergistic effect where the polyamine provides reactive amino groups for strong bonding while the carbohydrate components enhance water resistance and mechanical properties, replacing traditional harmful binders with a multi-component green alternative.
2Object-affected harmful factors
If carbohydrate polyamine binder compositions are used to reduce formaldehyde content, then environmental properties improve, but press times increase and internal bond strength decreases
Solution Approach 1:
The invention optimizes press time by adjusting the molecular weight parameter of the polyamine component (Mw ≥800 g/mol) and the ratio of polyamine to carbohydrate component. This parameter optimization enables faster curing kinetics and reduced press times compared to conventional carbohydrate polyamine binders, while maintaining low formaldehyde content through the alternative chemical composition.
Solution Approach 2:
The invention enhances local bonding quality at the lignocellulose-binder interface by using polyamines with specific amino group functionality and molecular weight characteristics. This localized optimization of binder properties at the bonding interface improves internal bond strength without requiring extended press times, addressing both productivity and bonding performance.
3Object-affected harmful factors
If carbohydrate polyamine binder compositions are used to reduce formaldehyde content, then environmental properties improve, but internal bond strength and swelling resistance become insufficient
Solution Approach 1:
The invention creates a composite binder system where polyamines (providing reactive amino groups) are combined with specific carbohydrate components (1,3-dihydroxyacetone, glycolaldehyde, and/or glyceraldehyde). This composite structure enhances internal bond strength and swelling resistance through synergistic interactions, overcoming the limitations of single-component carbohydrate polyamine binders while maintaining low formaldehyde content.
Solution Approach 2:
The invention optimizes the molecular weight parameter of the polyamine component (Mw ≥800 g/mol) to enhance bonding strength and swelling resistance. This parameter adjustment ensures adequate chain length and molecular structure for strong adhesion to lignocellulosic materials while maintaining the environmental benefits of reduced formaldehyde content.
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 proposed binder composition achieves reduced formaldehyde and isocyanate content, enhancing mechanical properties and swelling values of lignocellulose-based composite articles while being easier to store and transport.
Implementation Method 1
a binder composition comprising a) component A comprising polymer(s) A1 having primary and/or secondary amino groups... b) component B comprising component B1 which is 1,3-dihydroxyacetone, glycolaldehyde, glyceraldehyde or any mixture thereof
Data Source
AI summary
The present invention relates to a binder composition comprising a) component A comprising polymer(s) A1 having primary and/or secondary amino groups, wherein polymer(s) A1 has(have) a primary and secondary amine group nitrogen content of at least 1 wt.-% and b) component B comprising component B1 which is 1,3-dihydroxyacetone, glycolaldehyde, glyceraldehyde or any mixture thereof, wherein the polymer(s) A1 has(have) a total weight average molecular weight Mw,total of at least 800 g/mol.