Phenyl Glycidyl Ether Maltodextrin Adduct for Waterborne Coating Open Time
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Solution Overview
Problem
Waterborne coating formulations typically have a short open time of 3 to 5 minutes, which is inadequate for reworking without leaving brush marks, and existing additives compromise other coating properties like film adhesive strength and resistance.
Innovation Solution
A stable aqueous dispersion of polymer particles combined with a phenyl glycidyl ether adduct of maltodextrin, which increases open time while maintaining or improving other coating properties such as block resistance and stain resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If waterborne formulation is used to reduce VOC, then environmental compliance is improved, but open time deteriorates from 30-45 min to 3-5 min
Solution Approach 1:
The patent changes the chemical parameters of the waterborne formulation by introducing a phenolic glycidyl ether adduct of maltodextrin with specific molecular weight (500-10,000 Daltons) and hydroxyl number (50-200 mg KOH/g). This additive modifies the evaporation kinetics and film formation process, extending open time from 3-5 minutes to 15-30 minutes while maintaining zero VOC content.
Solution Approach 2:
The patent creates a composite waterborne coating system by combining polymer particles (latex) with the phenolic glycidyl ether adduct of maltodextrin. This composite approach allows the additive to work synergistically with the binder system, providing extended open time without compromising film adhesion, cohesion, or other performance properties.
2Duration of action of moving object
If existing additives are used to extend open time, then open time is improved, but film adhesive strength and cohesive strength deteriorate
Solution Approach 1:
The patent carefully controls the molecular weight (500-10,000 Daltons) and hydroxyl number (50-200 mg KOH/g) of the phenolic glycidyl ether adduct to optimize its interaction with polymer particles. These parameter controls ensure the additive extends open time while maintaining sufficient hydrogen bonding and intermolecular forces for strong film adhesion and cohesion.
Solution Approach 2:
The additive provides localized modification of the coating formulation's rheology and evaporation characteristics without uniformly compromising the polymer matrix. The phenolic glycidyl ether adduct acts at specific locations during film formation to extend open time, while the bulk polymer network maintains its adhesive and cohesive properties.
3Duration of action of moving object
If existing additives are used to extend open time, then open time is improved, but block resistance and stain resistance deteriorate
Solution Approach 1:
The patent optimizes the molecular weight and hydroxyl number of the phenolic glycidyl ether adduct to control its volatility and interaction with the film matrix. This ensures the additive provides extended open time during application while fully evaporating or integrating into the cured film, thereby maintaining block resistance and stain resistance comparable to control formulations.
Data Source
AI summary
The present invention relates to a coating composition which is a stable aqueous dispersion of polymer particles and a phenyl glycidyl ether adduct of maltodextrin. The composition of the present invention is useful for improving open time in coatings formulations.