Water-Dilutable Resin Binder With Sugar Alcohol for Low Emissions
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Solution Overview
Problem
Phenol formaldehyde resins used in insulation materials emit toxic chemicals and have high vapour pressure, leading to environmental concerns and reduced mechanical properties when sugars are added to mitigate emissions, which also decreases storage stability and wet mechanical properties.
Innovation Solution
A water-dilutable resin composition is developed, comprising a reaction product of an aldehyde and a hydroxyl-aromatic compound with an amino compound and a sugar alcohol, optimizing molar ratios and curing conditions to reduce emissions and maintain mechanical strength, using a phenol formaldehyde resin with a molar ratio of aldehyde to hydroxyl-aromatic compound from 2.3 to 5.5 and incorporating glycerol or other sugar alcohols to enhance environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenol formaldehyde resin is used as binder material, then good binding properties are achieved, but toxic emissions of phenol and formaldehyde increase
Solution Approach 1:
Amino compounds (urea, melamine) are introduced as intermediary substances that react with excess formaldehyde to form stable adducts, thereby reducing formaldehyde emissions while preserving the binding functionality of the phenol formaldehyde resin. The amino compounds act as mediators between the resin system and environmental concerns.
Solution Approach 2:
The invention creates a composite binder system combining phenol formaldehyde resin with amino compounds and sugar alcohols. This composite material integrates multiple functional components: the resin provides binding strength, amino compounds reduce formaldehyde emissions through chemical reaction, and sugar alcohols further suppress volatile emissions, achieving both performance and environmental goals.
2Object-generated harmful factors
If sugar is added to reduce emissions, then volatile emissions decrease, but wet mechanical properties and storage stability deteriorate
Solution Approach 1:
The invention changes the chemical parameter from sugar to sugar alcohol (polyol), which fundamentally alters the chemical behavior. Sugar alcohols lack the reactive carbonyl groups present in sugars, preventing unwanted side reactions that would compromise mechanical properties. This parameter change maintains emission reduction benefits while preserving strength characteristics.
Solution Approach 2:
Sugar alcohols serve as sacrificial additives that perform their emission-reducing function during the curing process and then become integrated into the cured resin matrix. They are consumed during curing to trap volatile compounds, after which they remain as stable part of the cured material, providing both emission control and maintaining mechanical integrity.
3Object-generated harmful factors
If ammonia is added to reduce formaldehyde emission, then formaldehyde emission decreases, but storage stability decreases and application timing becomes critical
Solution Approach 1:
Amino compounds are pre-added to the resin composition during manufacturing, performing the preliminary action of formaldehyde trapping before storage and application. This preliminary chemical reaction occurs during resin formulation, creating a stable composition that can be stored for extended periods without degradation, eliminating the need for just-in-time ammonia addition.
Solution Approach 2:
The resin composition is formulated to be self-regulating through the inherent reactivity between amino compounds and excess formaldehyde. The system automatically controls formaldehyde levels through this built-in chemical mechanism, eliminating the need for external ammonia addition and associated storage stability issues. The composition serves itself to maintain low emissions throughout storage and application.
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 resin composition significantly reduces phenol and formaldehyde emissions while maintaining or improving wet strength and storage stability, with glycerol integration into the resin network during curing, ensuring low volatile emissions and high mechanical properties.
Implementation Method 1
glycerol integration into the resin network during curing
Implementation Method 2
reaction product of an aldehyde and a hydroxyl-aromatic compound
Data Source
AI summary
The invention relates to a water dilutable resin composition comprising a resin that is a reaction product of an aldehyde and a hydroxyl-aromatic compound, said composition further comprising an amino compound comprising 2 - 6 amino groups and a sugar alcohol, wherein the resin has an initial molar ratio of aldehyde to hydroxyl-aromatic compound from 2.3 to 5.5, a ratio of resin to amino compound plus sugar alcohol of 45:55 to 70:30 parts by weight, a ratio of amino compound to resin between 20:80 and 50:50 parts by weight and a ratio of sugar alcohol to resin plus amino compound is between 5:95 and 30:70 parts by weight. The invention further relates to a process for the manufacture the resin composition, to the use of the resin composition as a binder material for non-woven fibrous material, in particular insulation materials, and to a process for the manufacture of such insulation material.