1、Epoxy Curing Agents – Mercaptans, The Ultimate Quick Ambient Cure
That is where mercaptans come into the picture as curing agents for epoxies. Mercaptans cure epoxies through an active hydrogen on a sulfur group (S-H), and typical mercaptan curing agents that are sold commercially have multiple S-H groups available for curing.
2、Mercaptan Based Polymer Polymercaptan Polythiol Epoxy Curing Agent
When formulated with tertiary amines it provides rapid curing on epoxy systems at low temperatures and in thin films. This mercaptan has excellent color and is especially fit for transparent epoxy systems or other systems in which clear color is a requirement.
3、A critical review of dynamic bonds containing curing agents for epoxy
Particular emphasis is given to synthesis approaches and curing performances of intrinsically recyclable epoxy curing agents for the development of next-generation epoxy thermosets.
Mercaptan Curing Agents for Epoxy
Mercaptan Curing Agents for Epoxy Description Rapid ambient curing mercaptan curing agents for epoxy systems.
Curing Agents for Epoxy Resins "jERCURE"
jERCURE™ curing agents for epoxy resins are an abundant set of curing agents that cover the full range from low to high curing temperature with functional groups ranging from amine, mercaptan, and phenol to Lewis acid complex compounds.
Types of Epoxy Curing Agents – Part 2
Mercaptans, also known as thiol curing agents, are a type of epoxy curing agent that contain sulfur-based mercaptan or thiol functional groups. They react with epoxy resins to form a thioether cross-linking network.
Mercaptan Ester Epoxy Curing Agents
In addition to its multifunctional epoxy resins and aromatic amine curing agents, Royce introduces two new product lines: toughened epoxy resins and mercaptan curing agents.
2 Curing agents for epoxy resins*
Curing can occur by either homopolymerisation initiated by a catalytic curing agent or a polyaddition/copolymerisation reaction with a multifunctional curing agent. Specific curing mechanisms will be detailed within the ensuing sections.
Epoxy Curing Agents
This chapter focuses on epoxy curing agents, also known as curatives, which include crosslinkers and catalysts.
Chapter 5: Epoxy Curing Agents and Catalysts
The curing agents along with the epoxy resin determine the type of chemical bonds and the degree of crosslinking that will occur. The advantages, disadvantages, and applications for the major types of epoxy curing agents are summarized in Table 5.1.
In the vast realm of modern materials science, epoxy resins are widely utilized in electronics, automotive, aerospace, construction, and other fields due to their exceptional properties. Epoxy curing agents, serving as the bridge between epoxy resins and their final cured products, are undeniably critical. Among these, mercaptan compounds stand out as preeminent curing agents due to their unique chemical properties and excellent reactivity. This article delves into the chemical foundations, application characteristics, synthesis methods, and industrial case studies of mercaptan-based epoxy curing agents.
Mercaptans, characterized by the formula RSH, contain a sulfur atom capable of donating two lone pairs of electrons, enabling them to participate in chemical reactions. Their highly reactive nature allows for addition, substitution, elimination, and other reactions with organic or inorganic compounds. These traits confer distinct advantages to mercaptan-based curing agents during the curing process.
The primary benefits of mercaptan-based epoxy curing agents include superior chemical and thermal stability. Under high-temperature conditions, mercaptans remain non-degradable, ensuring curing process stability. Additionally, their rapid reaction kinetics and short curing times significantly enhance production efficiency. These curing agents also exhibit broad compatibility with various epoxy resin types, expanding their applicability.
Mercaptan-based curing agents are diverse and classified into aliphatic mercaptans, aromatic mercaptans, and heterocyclic mercaptans based on functional groups. Aliphatic mercaptans, with longer carbon chains, offer better solubility and penetration, suiting high-filler applications. Aromatic mercaptans feature higher thermal stability and low volatility, ideal for environmentally sensitive settings. Heterocyclic mercaptans combine advantages of both, enabling versatile use.
Synthesis methods for mercaptan-based curing agents include transesterification, reduction, and oxidation approaches. Transesterification involves reacting mercaptans with unsaturated compounds to form thiol esters, followed by reduction to yield target mercaptans. Reduction methods convert mercaptans into sulfur-containing intermediates, which are then re-reduced. Oxidation methods transform mercaptans into oxygen-containing compounds before reductive regeneration.
Practical applications highlight the potential of mercaptan-based curing agents. In aerospace, for instance, researchers developed a novel mercaptan curing agent to enhance composite material strength and heat resistance. This agent ensures rapid curing at lower temperatures while maintaining compatibility with epoxy resins, significantly improving composite performance.
In electronic packaging, mercaptan-based curing agents are extensively used in chip encapsulation and PCB manufacturing. By adjusting mercaptan types and ratios, mechanical and electrical properties of cured materials can be precisely tailored to meet diverse electronic product demands.
Beyond these fields, mercaptan-based curing agents play pivotal roles in construction, automotive, and energy sectors. In construction, they bond materials and repair cracks; in automotive manufacturing, they improve component adhesion, wear resistance, and corrosion protection; in energy, they enable insulating materials and high-temperature coatings.
mercaptan-based epoxy curing agents have become indispensable in modern materials science due to their优异的chemical properties and wide-ranging applications. As technology advances, these agents will continue to drive innovation and progress in materials science.
