1、The effect of anionic emulsifiers’ diversity and manufacturing
Through static tests, storage tests, sieve residue tests, and laser particle size tests, the impacts of emulsifiers on the storage stability and dispersion of asphalt were analyzed.
2、Preparation and properties of a novel waterborne epoxy resin modified
In this study, a novel graft copolymerization method was proposed to prepare WER with particle size up to nanometer, which retained most of the epoxy functional groups in the epoxy resin, thus better improving the mechanical properties of emulsified asphalt better.
3、Synthesis and characterization of emulsion‐type curing agent of water
From the size of curing agent and epoxy resin latex measured by dynamic light scattering (DLS), it is found that the polyether segment in the curing agent remarkably affects the...
4、Improved curing performances of epoxy resin by a structure
From the size of curing agent and epoxy resin latex measured by dynamic light scattering (DLS), it is found that the polyether segment in the curing agent remarkably affects the self-emulsifying and emulsifying abilities.
A curing agent for epoxy resin based on microencapsulation of 1
Results demon-strated that the optimal particle size was about 10.8 lm, and the maximum content of 1BMI in MCs was 33% corresponding to 60% 1BMI in oil phase. Afterward, the 1BMI MCs were used as latent curing agent (LCA) for epoxy resin (EP).
Preparation of waterborne epoxy dispersion and its application in 2K
By exploring the curing mechanism, the superior performances of the coatings film prepared by waterborne epoxy dispersion and waterborne epoxy curing agent are presented. The nanometer-sized and stable waterborne epoxy dispersions are achieved by phase inversion method using the reactive emulsifier. 1. Introduction.
Synthesis and characterization of waterborne epoxy curing
The particle size and the distribution of water dispersion of the curing agent were measured by dynamic light scattering (DLS). The structure of the products was characterized by Fourier transform infrared spectrometer (FTIR) and 1H-nuclear magnetic resonance (1H NMR).
Preparation and Properties of Waterborne Epoxy Emulsion
The results showed that aqueous epoxy emulsifier and waterborne epoxy emulsion were successfully prepared. The aqueous epoxy emulsion has a particle size distribution of 0.8~1.5 μm...
The effect of anionic emulsifiers' diversity and manufacturing
In this paper, eight anionic emulsifiers and two preparation procedures were chosen for stability tests. Through static tests, storage tests, sieve residue tests, and laser particle size tests, the impacts of emulsifiers on the storage stability and dispersion of asphalt were analyzed.
Study on the Synthesis and Properties of Waterborne Epoxy Resin and
The experimental results showed that, when molar ratio of epoxy resin and diethanolamine was 4:3, reaction temperature of 70-80°C, the preparation of waterborne epoxy resin emulsion has small particle size and good stability.
With the development of modern industry, epoxy floor coatings have been widely used in various ground decorations due to their excellent abrasion resistance, chemical resistance, and aesthetic appeal. As a key component, the particle size of epoxy emulsions directly affects the performance and application outcomes of the coatings. studying the particle size of curing agent-emulsified epoxy emulsions is of great significance for improving coating quality.
An epoxy emulsion is a liquid mixture composed of epoxy resin, solvents, and other additives. Through emulsification technology, it is dispersed into fine particles to facilitate reactions with curing agents, forming a robust coating film. In this process, the curing agent initiates the polymerization of epoxy groups within the emulsion, creating a cross-linked network structure that enhances the mechanical strength and chemical resistance of the coating.
Emulsification is a critical step in the preparation of epoxy emulsions. Emulsifiers, which reduce the surface tension between oil and water phases, enable oil droplets to aggregate into larger water droplets and then disperse into smaller droplets. the selection and usage of emulsifiers directly impact the final product's performance. Appropriate emulsifiers effectively prevent oil droplet recoagulation, maintain emulsion stability, and promote uniform curing agent distribution, ensuring consistency and uniformity across the coating.
Several factors influence the particle size of curing agent-emulsified epoxy emulsions, including the type and dosage of emulsifiers, temperature, and stirring speed. The structural characteristics of emulsifier molecules, such as the number and type of hydrophilic or hydrophobic groups, directly affect their interaction with oil droplets and, consequently, the emulsification effectiveness. Additionally, emulsifier concentration is crucial; excessively high or low concentrations can compromise emulsification outcomes.
In experimental research, researchers have identified specific emulsifier combinations that significantly improve epoxy emulsion stability and particle size distribution. For instance, non-ionic emulsifiers containing long-chain alkyl groups effectively encapsulate oil droplets, preventing recoagulation, while cationic emulsifiers with specific functional groups stably disperse in water, forming stable emulsions.
Temperature also plays a vital role in particle size determination. Elevated temperatures during emulsification enhance emulsifier molecular movement, promoting oil-water mixing and improving emulsification efficiency. excessive temperatures may cause emulsifier decomposition, compromising emulsion stability. Thus, controlling an appropriate temperature is essential for producing high-quality epoxy emulsions.
Stirring speed similarly affects particle size. Optimal stirring promotes thorough contact between emulsifiers and oil droplets, accelerating emulsification. excessive speed can break oil droplets, destabilizing the emulsion. adjusting stirring speed according to specific conditions is necessary to achieve optimal emulsification.
In practical applications, the particle size of curing agent-emulsified epoxy emulsions directly impacts performance. Smaller particle sizes offer better fluidity and penetration, facilitating coating application and drying. They also provide higher surface coverage, contributing to more uniform and dense coatings. Conversely, larger particle sizes increase coating porosity, reducing chemical resistance and mechanical strength.
To enhance epoxy emulsion performance, researchers continuously explore new emulsification technologies and processes. For example, nanotechnology-based nano-emulsifiers improve emulsification efficiency and reduce particle size, while ultrasonic-assisted emulsification further refines particles, enhancing coating uniformity and quality.
the particle size of curing agent-emulsified epoxy emulsions is a complex and critical issue involving emulsifier selection, temperature control, and stirring speed adjustment. By thoroughly investigating and optimizing these parameters, high-performance epoxy emulsions can be produced to meet modern industry's demands for advanced coatings.
