1、Water resistance and curing kinetics of epoxy resins with a novel

In order to increase thermal stability and decrease water uptake of conventional epoxy resins, the biphenyl structure was introduced through the curing agent. A novel biphenyl-containing amine (BPDP) was synthesized by one-pot method and used as the curing agent for bisphenol-A epoxy resin DGEBA.

2、Construction and Curing Behavior of Underwater In Situ Repairing

Meanwhile, electrochemical impedance spectroscopy (EIS) was applied to observe its curing behavior underwater. Adhesion tests showed that the coatings cured underwater had good adhesion to different substrate surfaces and the ideal ratio of curing agent to epoxy resin was 0.6.

3、Standards for Water Resistance of Epoxy Curing Agents

Standard Test Methods: The internationally recognized ASTM D1658-07 standard is commonly used to evaluate the water resistance of epoxy curing agents. This standard outlines multiple immersion testing protocols under varying conditions to assess water resistance.

4、Effects of dopamine

By mimicking mussel adhesive proteins, dopamine (DA) was applied as one of the two curing agents of epoxy adhesive to improve the water resistance of the adhesive, and the other was phenethylamine (PEA).

Curing reactions of epoxy powder coatings in perspectives of chemical

The properties of the cured products of epoxy powder coatings are dominated by the curing systems. This review discusses the types, reaction principles, characteristics of curing agents and accelerators that participate in the curing reaction with different epoxy resins.

Enhancing epoxy resin curing: Investigating the catalytic role of water

Water molecules act as unique catalysts in the curing of epoxy resins, altering the reaction pathways and reducing the activation energies. The study revealed significant improvements in the physical properties of the resulting epoxy resins, aligning them more closely with the experimental material characteristics.

Curing

In this work, the effects on the curing-dependent modulus and the internal stress development of the epoxy/crosslinker chemistry, curing temperature, relative humidity, filler conditions, and initial solvent concentration, are studied.

Stable waterborne epoxy resins: Impact of toughening agents on coating

However, the organic toughening agents are often softer than the epoxy matrix; when used at high concentrations, the agents can compromise the hardness and chemical resistance of the coating.

10.11648.j.ajpst.20260801.14

Abstract: The water-based epoxy fire retardant coating is formed by reaction curing, which not only has good anti-corrosion performance, but also has environmental protection and flame...

Chemical Resistance with Olin D.E.H. Curing Agents

Epoxy coatings are known to provide good resistance to various chemicals such as acids, bases, organic solvents and various synthetic fluids. To achieve the desired performance, the selection of the hardener plays a critical role.

In modern industrial and construction fields, epoxy curing agents, as curing accelerators for epoxy resins, are widely used in coatings, adhesives, sealants, and numerous other products. The quality and performance of these products largely depend on the stability and durability of the cured materials. conducting water resistance tests on epoxy curing agents is particularly critical. This article aims to explore the methods and significance of water resistance testing for epoxy curing agents.

I. Importance of Water Resistance Testing for Epoxy Curing Agents

Water resistance is a key indicator of epoxy curing agent performance. Good water resistance ensures that cured materials do not expand, soften, or detach due to water exposure, thereby guaranteeing long-term stability and reliability. Additionally, water resistance relates to environmental performance; materials with low water absorption can reduce moisture penetration into substrates, avoiding potential corrosion issues.

II. Water Resistance Testing Methods

1. Static Soaking Method: Samples are placed in water for a specified duration, and changes in color, volume (expansion/contraction), and surface condition are observed. Simple to implement, this method cannot accurately reflect real-world performance.

2. Dynamic Soaking Method: Simulates environmental conditions such as temperature fluctuations and pressure changes during actual use through prolonged continuous immersion. This approach better reflects real-world performance.

3. Accelerated Aging Test: Subjects samples to high-temperature and high-humidity conditions to simulate long-term usage issues. By comparing pre- and post-aging performance, water resistance is evaluated.

4. Infrared Spectroscopy Analysis: Measures changes in infrared absorption after water exposure to indirectly assess material-water interactions, thereby evaluating water resistance.

III. Analysis of Water Resistance Test Results

Key parameters to monitor during testing include:

1. Initial Water Absorption Rate: Reflects the material’s immediate reaction to water exposure.
2. Water Absorption Rate: Describes the speed of water uptake (water absorbed per unit time).
3. Saturation Water Content: The maximum amount of water the material can absorb over time.
4. Hydrolytic Stability: Evaluates the material’s ability to maintain performance under hydrolysis.
5. Freeze-Thaw Cycle Resistance: Assesses the material’s capacity to withstand repeated freezing and thawing in low-temperature environments.

Water resistance testing of epoxy curing agents is vital for ensuring product quality and extending service life. By selecting appropriate testing methods and analyzing results comprehensively, material water resistance can be effectively evaluated, providing scientific guidance for product improvement. With technological advancements and evolving market demands, future research on water resistance testing will deepen, aiming to develop higher-performance, more environmentally friendly materials.