Aqueous Two-Component Binder System for Hand Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous two-component systems for producing curable materials require complex mixing processes, making it difficult to achieve homogeneous mixing, especially in small quantities, and do not allow for easy hand mixing, which is a requirement in operational paint shops like those for automotive refinishing.
Innovation Solution
A new aqueous two-component system comprising an aqueous binder component with a water-soluble or water-dispersible (meth)acrylate copolymer and a low molecular weight hydrophobic polyester, combined with an anhydrous crosslinking agent component containing hydrophilized polyisocyanate with ionic acid groups, which can be stored separately and mixed by hand to produce thermoset materials with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If complex mixing processes are used to achieve homogeneous mixing, then mixing homogeneity is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The invention modifies the chemical parameters of the binder component by incorporating specific functional groups (isocyanate-reactive groups, hydroxyl groups, carboxylic acid groups) that enable spontaneous chemical interaction with the crosslinking agent. This chemical parameter change allows the system to achieve homogeneous mixing through simple hand mixing without requiring complex mechanical stirring devices
Solution Approach 2:
The aqueous binder component acts as an intermediary medium that facilitates spontaneous mixing with the crosslinking agent component. The water-soluble or water-dispersible nature of the binder components creates a compatible mixing environment that enables homogeneous blending through simple manual mixing, eliminating the need for complex mixing equipment
2Stability of the object's composition
If complex mixing processes are used, then mixing homogeneity is improved, but ease of operation deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the binder component, specifically its solubility and reactivity characteristics. The water-soluble or water-dispersible binder with isocyanate-reactive functional groups enables spontaneous and homogeneous mixing with the crosslinking agent, making the system easy to operate by hand mixing while maintaining excellent mixing homogeneity
Solution Approach 2:
The binder component is designed to self-mix with the crosslinking agent component through spontaneous chemical interaction. The isocyanate-reactive functional groups in the binder automatically react with the polyisocyanate crosslinking agent upon contact, eliminating the need for complex external mixing processes and enabling easy hand mixing operation
3Ease of operation
If new two-component systems are developed for simple hand mixing, then ease of operation is improved, but manufacturing precision may deteriorate
Solution Approach 1:
The invention precisely controls the chemical parameters of the binder component, including the type and amount of isocyanate-reactive functional groups (hydroxyl, carboxylic acid), molecular weight, and solubility characteristics. This precise parameter control ensures reproducible curable material properties while maintaining ease of hand mixing operation
Solution Approach 2:
The invention uses composite binder systems combining water-soluble or water-dispersible polymers with specific functional groups in defined ratios. This composite approach, where the binder contains multiple functional components (polymer backbone, reactive groups, hydrophilic/hydrophobic balance), ensures reproducible performance while enabling simple hand mixing
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 new system enables simple, reproducible production of thermally or actinic radiation-curable materials that can be easily mixed by hand, resulting in thermoset materials with a property profile that matches or exceeds the quality of existing systems, including high gloss, low haze, and excellent flow and adhesion.
Implementation Method 1
The aqueous binder component (I) contains at least one secondary dispersion (A) which contains at least one water-soluble or water-dispersible (meth)acrylate copolymer (A1) which can be produced by a multi-stage copolymerization and has at least two isocyanate-reactive functional groups
Implementation Method 2
an anhydrous crosslinking agent component (II) which contains hydrophilized polyisocyanates (C) which contain at least one ionic acid group
Data Source
AI summary
Aqueous multicomponent systems comprising (I) at least one aqueous binder component comprising (A) at least one secondary dispersion comprising (A1) at least one water-soluble or water-dispersible (meth)acrylate copolymer which is preparable by a multistage copolymerization and has at least two isocyanate-reactive functional groups and (A2) at least one low molecular weight and/or oligomeric, essentially unbranched, hydrophobic polyester having at least two hydroxyl groups in the molecule, an OH number of from 56 to 500 mg KOH/g, an acid number of <10 mg KOH/g and a number-average molecular weight Mn of from 300 to 2000 daltons; and (B) at least one additive; and (II) at least one anhydrous crosslinking component comprising (C) at least one hydrophilized polyisocyanate; process for its preparation and its use.