Unsaturated Polyester Binder Free Radical Curing
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Solution Overview
Problem
Conventional lignocellulose composite product binders, such as formaldehyde-based resins, emit formaldehyde during production and curing, leading to environmental concerns and compromising product strength and moisture resistance, with existing mitigation techniques resulting in longer cure times and reduced resin shelf-life.
Innovation Solution
A binder composition comprising unsaturated compounds with pi-bonds capable of free radical addition, combined with a free radical precursor, including inorganic oxidants and catalysts, to form a mixture with lignocellulose substrates and heat-treated to produce a composite product with reduced formaldehyde emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde-based resins are used as binders, then product strength is improved, but formaldehyde emission increases causing environmental harm
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using unsaturated polyester resin instead of formaldehyde-based resin, and adjusts the ratio of free radical generator to resin (0.1-20 parts per hundred parts of resin) to achieve both strong bonding and low formaldehyde emission
Solution Approach 2:
The patent converts the potentially harmful free radical reaction into a beneficial curing mechanism by using free radical generators to initiate polymerization of unsaturated polyester resin, creating strong bonds without formaldehyde emission, thus turning a potentially problematic chemical mechanism into an environmental benefit
2Object-generated harmful factors
If formaldehyde scavengers are added to reduce formaldehyde emission, then harmful emissions are reduced, but cure time increases and resin shelf-life decreases
Solution Approach 1:
The patent extracts and eliminates the need for formaldehyde scavengers by completely replacing formaldehyde-based resins with unsaturated polyester resin system, thereby reducing formaldehyde emission to near zero without requiring additional additives that would extend cure time or reduce shelf-life
Solution Approach 2:
The patent changes the chemical system from formaldehyde-based to unsaturated polyester-based, fundamentally altering the cure mechanism to free radical polymerization, which enables fast curing and long shelf-life while maintaining near-zero formaldehyde emission
3Object-generated harmful factors
If formaldehyde-based resins are modified to reduce emission, then harmful emissions are reduced, but product strength and moisture resistance deteriorate
Solution Approach 1:
The patent replaces the harmful formaldehyde chemistry with beneficial unsaturated polyester resin chemistry that inherently provides both strong bonding and moisture resistance while eliminating formaldehyde emission, thus converting a harmful chemical system into a beneficial one that meets all performance requirements
Solution Approach 2:
The patent creates a composite binder system combining unsaturated polyester resin with free radical generators and optional fillers or modifiers, achieving superior performance in terms of strength, moisture resistance, and environmental compatibility that cannot be achieved by modified formaldehyde resins alone
4Object-generated harmful factors
If conventional binder techniques are used to reduce formaldehyde emission, then harmful emissions are reduced, but resin shelf-life decreases
Solution Approach 1:
The patent extracts and eliminates the need for formaldehyde emission reduction techniques by using an inherently low-emission unsaturated polyester resin system, thereby preserving full resin shelf-life without requiring any emission-reducing additives or modifications that would compromise storage stability
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 solution effectively reduces formaldehyde emission, maintains product strength, and improves processing efficiency while avoiding the drawbacks of conventional binders, such as extended cure times and reduced resin stability.
Implementation Method 1
at least one of the unsaturated carbon-carbon bonds is a pi-bond that is not conjugated with an aromatic moiety and is capable of free radical addition
Implementation Method 2
at least one free radical precursor, wherein a weight ratio of the at least one free radical precursor to the at least one unsaturated compound is at least 0.23:1 to 10:1
Implementation Method 3
heating the mixture to a temperature of 60°C to 300°C to produce a composite product
Implementation Method 4
unsaturated compound having two or more unsaturated carbon-carbon bonds, wherein at least one of the unsaturated carbon-carbon bonds is a pi-bond that is not conjugated with an aromatic moiety and is capable of free radical addition
Data Source
AI summary
Binder compositions and methods for making and using same are provided. In at least one specific embodiment, the binder composition can include at least one unsaturated compound having two or more unsaturated carbon-carbon bonds and at least one free radical precursor. At least one of the unsaturated carbon-carbon bonds can be a pi-bond that is not conjugated with an aromatic moiety and can be capable of free radical addition. The free radical precursor can be present in an amount of about 7 wt% to about 99 wt%, based on the weight of the one or more unsaturated compounds.