1、Epoxy Curing Agents and Antioxidants

Epoxy curing agents are chemicals that promote the curing of epoxy resins. They typically contain active hydrogen atoms or functional groups with specific reactivity, which react with epoxide groups in epoxy resins to form stable three-dimensional network structures.

2、Lysine

To confer practical functionality, epoxy resins must undergo cross-linking with curing agents. The common curing agents for epoxy resins include aliphatic diamines and polyamines, aromatic polyamines and other nitrogenous compounds, as well as modified fatty amines, serving as basic curing agents.

3、Retarding thermal

Epoxy asphalt (EA) binder and mixtures incorporating antioxidant Irganox 1010 were analysed. Irganox 1010 plays a crucial role in aging protection effect of EA binder and mixture.

Substituting the epoxy curing agent with a greener solution

In addition, most of the conventional curing agents used in epoxy resins are highly noxious in nature causing skin allergies and asthma. The green epoxy resin is capable of reducing these toxic effects but have few shortcomings including its cost and the mechanical performance of cured epoxy resin.

the impact of antioxidant curing agents on the curing kinetics and

let’s get real for a second: curing agents are the unsung heroes of polymer chemistry. they sneak in like tiny molecular ninjas, orchestrating cross-linking reactions that turn gooey resins into robust, load-bearing materials. but here’s the plot twist—these heroes often get oxidized out of the game before they even start. enter ...

Epoxy Curing Agents

This chapter focuses on epoxy curing agents, also known as curatives, which include crosslinkers and catalysts.

Sustainable Bio

Significant progress in new bio-based epoxy material development on bio-based epoxy resins, curing agents, and additives, as well as bio-based epoxy formulated products, has been achieved recently not only in fundamental academic studies but also in industrial product development.

Bio

Bio-based epoxy curing agents from lignin was synthesized by ring-opening reactions of cyclic aza-silane species to obtain lignin-based curing agents with amine hydroxyl equivalent weights up to 68 g/eq.

The epoxy resin system: function and role of curing agents

Curing agents are critical components of aqueous epoxy resin systems. Unfortunately, its uses and applications are restricted because of its low emulsifying yields. Epoxy resins are...

Effect of flavonoid monomer and epoxy value: Toward making bio

Savonne et al. prepared three novel divanillin-based epoxy synthons (GEDVA) with different numbers of epoxy functional groups, using them as monomer precursors for epoxy thermosetting resins, and curing reactions were carried out using isophorone diamine (IPDA) as the curing agent.

Addition of Antioxidants to Epoxy Curing Agents

In modern industry and construction, epoxy resin is highly favored for its excellent physical properties, chemical stability, and broad application range. epoxy resin may suffer from oxygen-induced degradation during long-term storage and use, leading to performance decline or even failure. the addition of antioxidants to epoxy curing agents has become a critical step. This article explores the importance and applications of antioxidants in epoxy curing systems.

I. Function and Characteristics of Epoxy Curing Agents

Epoxy curing agents are substances that promote the curing reaction of epoxy resin. They typically contain reactive functional groups such as hydroxyl (-OH) or amino (-NH₂), which provide energy during chemical reactions with epoxy resin. This energy facilitates the formation and cross-linking of resin molecular chains, resulting in the desired mechanical properties and chemical resistance.

II. Definition and Classification of Antioxidants

Antioxidants are substances that prevent or slow down the oxidative degradation of organic compounds. They work by trapping free radicals, inhibiting redox reactions, or other mechanisms to delay or prevent oxidation. Based on their mechanisms and chemical structures, antioxidants can be classified as follows:

1. Phenolic Antioxidants: Represented by phenol, hydroxybenzoates, etc., these exhibit strong antioxidant effects.
2. Amine Antioxidants: Including thiophosphates, sodium thiosulfate, etc., they primarily prevent oxidation by capturing free radicals.
3. Phosphite Antioxidants: Examples include trinonyl phosphite and triphenyl phosphite, which inhibit oxidation by forming stable phosphorus-oxygen bonds.
4. Hindered Amine Light Stabilizers (HALS): These compounds absorb UV light and decompose free radicals, protecting polymers from oxidation.
5. Metal Ion Chelators: Such as ethylenediaminetetraacetic acid (EDTA) and citrates, which form insoluble complexes with metal ions to reduce their catalytic effects.

III. Applications of Antioxidants in Epoxy Curing Systems

Adding antioxidants to epoxy resin systems can effectively extend their service life and improve product reliability and safety. Specific applications include:

1. Phenolic Antioxidants: Due to their low cost, good thermal stability, and electrical insulation properties, phenolic antioxidants are commonly used in epoxy resins. their volatility and irritant nature require careful dosage control and environmental management.
2. Amine Antioxidants: With good thermal stability and UV resistance, amine antioxidants suit products exposed to outdoor or high-temperature conditions. their high toxicity necessitates strict safety protocols.
3. Phosphite Antioxidants: These offer high thermal stability and UV resistance, suitable for various epoxy systems. they may interact poorly with other additives, affecting performance.
4. Hindered Amine Light Stabilizers (HALS): Excellent for UV and oxidation protection in outdoor or high-temperature applications. Their high cost, limits widespread use in general industries.
5. Metal Ion Chelators: Effective in neutralizing metal ion catalysis to prolong resin life. poor compatibility with resin systems requires cautious selection.

adding antioxidants to epoxy curing agents is crucial for maintaining resin performance and extending its service life. Selecting appropriate antioxidant types and controlling dosages can significantly enhance product reliability and safety. factors such as cost, environmental impact, and compatibility with resin systems must also be considered to ensure optimal comprehensive performance.