Low-Viscosity Urea-Formaldehyde Resins via Monofunctional Alcohol Modification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing condensation resins made from urea, formaldehyde, and CH-acidic aldehydes have high viscosity, which requires the use of organic solvents to adjust viscosity, leading to high volatile organic compound (VOC) emissions, necessitating the development of low-viscosity alternatives.
Innovation Solution
A process involving the reaction of essentially fully reacted condensation resins with monofunctional alcohols in the presence of a Brönstedt acid, achieving low viscosity by optimizing the molar ratios and reaction conditions to minimize unreacted components and reduce VOC usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If condensation resins are produced from urea, formaldehyde and CH-acidic aldehydes using conventional processes, then the resins achieve sufficient stability and molecular weight, but the viscosity becomes too high for practical applications
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions, specifically using a basic catalyst (potassium hydroxide) instead of conventional acidic catalysts, and controlling the molar ratios of reactants (urea:formaldehyde:isobutyraldehyde = 1:2:15 to 1:2:2) to achieve the desired low viscosity while maintaining resin stability and appropriate molecular weight
Solution Approach 2:
The invention creates a composite condensation resin structure by reacting urea with both formaldehyde and CH-acidic aldehydes (particularly isobutyraldehyde) in specific ratios, producing a resin with combined characteristics that achieve both stability and low viscosity, eliminating the need for high levels of volatile organic compounds
2Temperature
If organic solvents are added to adjust the viscosity of condensation resins, then the viscosity becomes suitable for applications, but the content of volatile organic compounds increases
Solution Approach 1:
The patent converts the potential harm of high viscosity into a benefit by using the reaction of urea with CH-acidic aldehydes under basic conditions to produce a resin that is inherently low in viscosity, thereby eliminating the need to add volatile organic compounds as viscosity modifiers and reducing VOC emissions
3Stability of the object's composition
If the reaction is allowed to proceed to high conversion to reduce unreacted components, then the resin stability improves, but the viscosity increases
Solution Approach 1:
The patent changes the fundamental reaction parameters by using a basic catalyst system (potassium hydroxide) instead of acidic catalysts and controlling the reactant ratios (particularly high isobutyraldehyde content at 15-2 parts per 1 part urea), which allows the resin to maintain low viscosity even at high conversion levels of 95% or above
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 process results in condensation products with lower viscosity, allowing for increased solids content in pigment preparations, reduced solvent need, and lower organic emissions, while maintaining suitable molecular weights and chemical properties.
Implementation Method 1
reacted with at least one monofunctional alcohol in the presence of at least one Brönstedt acid
Implementation Method 2
condensation resins made from urea, formaldehyde and CH-acidic aldehydes
Data Source
AI summary
Provided is methods for preparing condensation resins from urea, formaldehyde, and CH-acidic aldehydes, condensation resins obtained according to the methods, and uses of condensation resins in pigment preparations.