Formaldehyde-Free Binder for Composite Materials
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Solution Overview
Problem
There is a need for new methods to produce composite materials that are free from formaldehyde emissions, as existing methods using phenol-formaldehyde resins or their extensions face concerns regarding formaldehyde emissions during production and use.
Innovation Solution
The development of composite materials using a formaldehyde-free binder composition comprising an aqueous binder polymerized from components such as cyclic anhydrides, maleimides, and styrene derivatives, with a pH-adjusting base, which forms a cured binder composition that constitutes less than 40 wt% of the composite material, providing a strong bond and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If phenol-formaldehyde resins or phenol-formaldehyde resins extended with urea are used to prepare composite materials, then strong bonding and structural integrity are achieved, but formaldehyde emissions occur during preparation, manufacture, and use of the composite materials
Solution Approach 1:
The patent extracts and removes the harmful formaldehyde component from the binder system by replacing phenol-formaldehyde resins with alternative polymers such as polyacrylic acid and carboxymethyl cellulose that do not contain formaldehyde, thereby eliminating formaldehyde emissions while maintaining bonding functionality
Solution Approach 2:
The patent changes the chemical composition parameters of the binder by using different polymer types (polyacrylic acid, carboxymethyl cellulose, starch) with specific molecular weights and degrees of substitution, adjusting pH levels (6-8), and modifying crosslinking agents to achieve formaldehyde-free bonding with comparable strength
2Object-generated harmful factors
If alternative formaldehyde-free binder compositions are used, then formaldehyde emissions are eliminated, but the bonding strength and structural integrity of composite materials may be compromised
Solution Approach 1:
The patent employs composite binder systems combining multiple components (polyacrylic acid, carboxymethyl cellulose, starch, crosslinking agents like borax or epoxides) to achieve synergistic effects that provide both formaldehyde-free operation and adequate bonding strength for composite material construction
Solution Approach 2:
The patent introduces intermediary substances such as crosslinking agents (borax, epoxides, silanes) that mediate between the binder polymers and substrate surfaces, enhancing adhesion and structural integrity without requiring formaldehyde-based resins
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 produces composite materials with reduced formaldehyde emissions, offering strong bonding, elasticity, and moisture resistance, suitable for various applications while being odor-free and non-corrosive.
Implementation Method 1
a binder polymer polymerized from component Y and optional component Z; where component Y is at least one of a cyclic anhydride, a maleimide and a substituted maleimide
Implementation Method 2
an aqueous binder composition comprising an aqueous solvent, component X and a binder polymer; where component X is at least one base; wherein the pH of the aqueous binder composition is >6
Implementation Method 3
a cured binder composition, wherein the cured binder composition is produced from an aqueous binder composition comprising an aqueous solvent, component X and a binder polymer polymerized from component Y
Data Source
AI summary
Composite materials that contain formaldehyde-free, cured binder compositions are disclosed. Also disclosed are methods of making and using composite materials containing formaldehyde-free binder compositions.