1、The effect of epoxy resin and curing agent groups on mechanical
The mechanical properties and glass transition temperatures of epoxy resin systems with different structures were compared to investigate the influence of the epoxy resin and curing agent structures on the system performance.
2、Microsoft Word
Curing Behavior of the Microcapsule-type Curing Agent for Epoxy Resin Thermal curing behavior of the DDM-PMMA microcapsules to epoxy resin was examined by DSC under argon...
3、Journal of Applied Polymer Science
The one-component adhesive consisting of DDM-PMMA microcapsule and epoxy resin can be cured within 30 min at 130 °C, and the room temperature latent period is more than 30 days.
4、The effect of 4,4′
The curing reaction involves the nucleophilic attack of the amine groups in DDM on the epoxide rings of the epoxy resin, leading to chain extension and crosslinking.
Effect of the Structure of Epoxy Monomers and Curing Agents: Toward
Herein, a liquid crystalline epoxy (LCE) monomer with a biphenyl mesogenic unit was first synthesized through an efficient one-step reaction.
Preparation of Latent Curing Agent for Epoxy Resin by Encapsulation
The coating efficiency and latency were analyzed by DSC analysis of the one-component adhesive composed of the microcapsule-type curing agent and epoxy resin.
The Effect of Different Diluents and Curing Agents on the
Abstract The epoxy resin-based (ESB) intumescent flame-retardant coatings were modified with 1,4-butanediol diglycidyl ether (14BDDE) and butyl glycidyl ether (BGE) as diluents and T403 and 4,4′-diaminodiphenylmethane (DDM) as curing agents, respectively.
A review of the curing rate and mechanical properties of epoxy resin on
Abstract The curing rate of epoxy resins is a critical parameter that significantly influences the curing properties of polymer matrix composites (PMCs). It plays a vital role in meeting high-performance requirements, particularly in achieving rapid development of high modulus.
Application of 4,4′
This article provides a comprehensive overview of DDM’s role in epoxy resin curing systems, encompassing its reaction mechanism, influence on cured resin properties, advantages and disadvantages, application areas, and safety considerations.
Preparation of Latent Curing Agent for Epoxy Resin by
The microcapsule-type curing agents DDM-PMMA and IZ-PU were prepared by solvent evaporation method and interfacial polymerization method, respectively. The surface morphology of the two microcapsules was characterized by SEM.
In modern building materials and industrial products, epoxy resin is widely used due to its exceptional chemical stability, mechanical strength, and excellent electrical insulating properties. to fully leverage these characteristics, a critical factor lies in the appropriate proportion of curing agent. ddM (dimethylaniline), a commonly used curing agent for epoxy resin, directly impacts the performance of the final product when paired with epoxy resin at optimal ratios. This article delves into the proportional relationship between curing agent ddM and epoxy resin, along with its effects on material properties.
I. Mechanism of Action of Curing Agent ddM
Curing agent ddM primarily functions to promote polymerization reactions within the epoxy resin system. When mixed with epoxy resin, ddM decomposes into free amino groups and benzene rings, which chemically react with epoxy groups, initiating and accelerating the polymerization process. This reaction is exothermic and intensifies with rising temperatures, enabling rapid curing of the epoxy resin into a hard, stable structure.
II. Proportional Relationship Between ddM and Epoxy Resin
-
Theoretical Proportions
Theoretically, the ideal ratio of ddM to epoxy resin follows the "mole ratio" principle, where the molar amounts of ddM and epoxy resin are equivalent. For instance, if an epoxy resin molecule contains 100 epoxy groups, ddM should provide 100 free amino groups and benzene rings. This stoichiometric balance ensures complete reaction during polymerization, achieving optimal curing outcomes.
-
Practical Adjustments in Applications
In real-world engineering, factors such as cost, environmental conditions, and construction requirements often necessitate adjustments to the ddM-to-epoxy ratio. Engineers typically determine the optimal ratio through experimentation, which may vary depending on specific application scenarios.
-
Impact of Proportions on Performance
The optimal ratio of ddM to epoxy resin significantly affects the final product’s performance. Suboptimal ratios may lead to:
- Excessively long or short curing times, hindering production efficiency;
- Inadequate material strength or excessive hardness, compromising durability and workability;
- Unstable dimensional accuracy due to subpar or excessive shrinkage;
- Reduced heat resistance, chemical corrosion resistance, and other critical properties.
The ratio of curing agent ddM to epoxy resin is a key parameter requiring precise control. While the theoretical molar ratio of 1:1 serves as a baseline, practical adjustments must align with specific application demands, raw material properties, and desired product performance. By optimizing this ratio, the performance of epoxy resin-based materials can be substantially enhanced, meeting stringent industrial standards and client expectations. For engineers in related fields, mastering the proportional relationship between ddM and epoxy resin—and adapting it flexibly to real-world conditions—is essential for ensuring product quality and performance.
