Formaldehyde-Free Polyester Binder with Crosslinked Strength
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Solution Overview
Problem
Current formaldehyde-based resins used in various applications have undesirable properties, leading to the development of formaldehyde-free alternatives that often lack mechanical strength and performance, making it challenging to find substitutes with equivalent properties.
Innovation Solution
A method for preparing polyester materials by mixing organic acids with multiple carboxylic groups and multi-hydroxyl alcohols, followed by polymerization and the addition of cross-linking agents like melamine or acrylic polymers, to create binder materials that adhere substrates without using formaldehyde.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If formaldehyde-based resins are used, then good mechanical properties and adhesion are achieved, but harmful formaldehyde content is present
Solution Approach 1:
The patent removes formaldehyde from the resin composition entirely by using alternative monomers (citric acid, glycerol, trimethylolpropane) that polymerize to form binders without releasing formaldehyde, thereby eliminating the harmful substance while maintaining binder functionality
Solution Approach 2:
The patent creates composite binder systems combining polyester polymers from multifunctional monomers with crosslinking agents (melamine, isocyanates, or carboxylic acids) to achieve mechanical properties comparable to formaldehyde resins without the harmful formaldehyde content
2Object-affected harmful factors
If formaldehyde-free alternatives are used, then harmful formaldehyde content is reduced, but mechanical properties and performance deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the binder system by using monomers with three or more functional groups (carboxylic acid groups or hydroxyl groups) that enable extensive crosslinking, thereby achieving high mechanical strength without formaldehyde
Solution Approach 2:
The patent incorporates crosslinking agents into the binder formulation in advance, which then form crosslinked networks during curing to provide the necessary mechanical strength and adhesion properties without requiring formaldehyde
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 resulting polyester materials exhibit good mechanical properties, chemical resistance, and adhesion capabilities comparable to traditional formaldehyde-based resins while being free or having reduced formaldehyde content, making them suitable for applications like glass fiber insulation and construction materials.
Implementation Method 1
the polyester material functions to adhere the substrate together into or within the article of manufacture
Implementation Method 2
a cross-linking agent selected from the group consisting of a melamine-containing resin, a poly(N-methylolacrylamide)-containing material, melamine, an acrylic polymer, and combinations thereof
Data Source
AI summary
Polyester materials, methods for making polyesters materials, and uses of the polyester materials in binder materials and articles of manufacture are disclosed. In one embodiment, a process is provided for preparing a polyester solution, including mixing monomers of at least one organic acid containing at least three carboxylic groups and at least one multi-hydroxyl alcohol containing at least three hydroxyl groups to form a reaction mixture, heating the reaction mixture to a first temperature, polymerizing the monomers at the first temperature until reaching an acid value from about 200 to about 400 mg KOH/g, adjusting the temperature to a second temperature less than the first temperature, and forming the polyester solution. The polyester materials may be mixed with cross-linking materials to form binder materials. The binder material may then be used to form articles of manufacture.