1、Degradation of an underwater epoxy adhesive and its bonding to steel

Abstract Underwater adhesive is used to bond carbon fiber reinforced polymer (CFRP) composites to offshore or underwater structures. However, the long-term moisture exposure poses a challenge to the reliability and service life of the underwater adhesives.

2、Biological Effects and Toxicity of Compounds Based on Cured Epoxy

This curing agent can be employed for cold-cure epoxy resin, i.e., in applications where the curing process is required to take place at room temperature. According to the product’s safety data sheet, this product is caustic, skin irritating and may cause sensitization.

3、High

The results showed that the modified epoxy resin adhesive cured effectively in both air and underwater environments, demonstrating superior performance.

4、Broch. EPOXY Engels

Liquid epoxy resins and some reactive diluents are not readily biodegradable; although the epoxy functional groups are hydrolysed in contact with water, they have the potential to bioaccumulate and are moderately toxic to aquatic organisms.

5、Fast

In determining the strength of a bond that cured underwater, another test apparatus was constructed to allow an adhesive specimen to cure underwater in a fixed position and accurately load test each lap shear specimen (figure 3) based on the previous dry testing apparatus and lap shear specimens.

A polyurethane underwater adhesive with strong adhesion and self

Water weakens adhesives by penetrating their structure or interfering with the curing process. This study presents a simple method for synthesizing polyurethane prepolymers from epoxy resin, amino acids, and isocyanate.

Biological Effects and Toxicity of Compounds Based on Cured Epoxy Resins

Based on the results obtained, it can be concluded that all tested compounds, based on epoxy resins, which are also used as adhesives in various applications, are essentially safe materials when using such formulations in a cured state.

Biological Effects and Toxicity of Compounds Based on Cured Epoxy Resins

However, epoxy compounds, once cured, can exhibit slightly different characteristics, in particular, a different toxicity to humans.

Construction and Curing Behavior of Underwater In Situ Repairing

Unfortunately, these aforementioned materials are difficult to use as anti-corrosion coatings due to their limited ability to resist the intrusion of both water and corrosive ions despite their excellent adhesive properties underwater.

Curing kinetics and mechanical properties of an underwater SiO2/epoxy

In addition to resin and curing agents, adhesives often include some fillers to enhance their mechanical properties and bonding strength; especially the existing epoxy adhesives face the...

In modern industrial production, epoxy adhesives have become essential materials for bonding, sealing, and protecting various substrates due to their excellent adhesion properties, chemical stability, and mechanical performance. As environmental awareness grows, concerns about the safety of epoxy adhesives and their curing agents have intensified. This article explores whether underwater epoxy curing agents contain toxic substances and how to ensure their safe use.

1. Composition Analysis of Epoxy Adhesives

Epoxy adhesives primarily consist of epoxy resin, curing agents, diluents, and auxiliary additives. The curing agent is critical in determining the curing speed and final performance of the adhesive. Its selection directly impacts the application range, bonding effectiveness, and structural strength of the cured product. Common curing agents include polyisocyanates and imidazole compounds. These agents exhibit high reactivity, reacting with epoxy resin to form stable cross-linked networks, enabling robust bonding and curing.

2. Component Analysis of Curing Agents in Epoxy Adhesives

The choice of curing agent is crucial for epoxy adhesives. The type and ratio of curing agents significantly influence the adhesive’s performance. For instance, polyisocyanate-based curing agents accelerate curing and enhance bonding strength due to their high reactivity. polyisocyanates pose toxicity risks, such as irritating odors and volatile organic compounds (VOCs). safety and environmental considerations must guide the selection of curing agents.

3. Toxicity Issues of Epoxy Curing Agents

No conclusive scientific evidence confirms that all curing agents are hazardous to human health. certain types, like polyisocyanates, exhibit potential toxicity. When reacting with water or humidity, polyisocyanates release toxic isocyanate gases, which irritate the respiratory system and may cause long-term respiratory diseases. Additionally, these agents can contaminate soil and water sources.

4. Ensuring Safe Use of Epoxy Adhesives

To safeguard against risks, the following measures are recommended:

1. Select Low-Toxicity or Non-Toxic Curing Agents: Prioritize environmentally friendly options (e.g., imidazole compounds) that meet performance requirements.

2. Strengthen Production Controls: Rigorously monitor raw material quality, avoid using inferior or expired ingredients, and ensure proper waste disposal to minimize environmental pollution.

3. Train and Educate Personnel: Provide specialized training for handlers to ensure proper usage, safety protocols, and health monitoring.

4. Establish Environmental Monitoring Systems: Regularly test workplaces for hazardous substances to identify and mitigate environmental risks.

The toxicity of underwater epoxy curing agents requires careful attention. Prioritizing safety and eco-friendliness in curing agent selection, strict process controls, staff training, and robust environmental monitoring can effectively reduce health and environmental risks, ensuring safe production and application.