Improvement of Curing Properties and Formulations of Epoxy Adhesives

Rapid curing improves construction efficiency, enhances the working environment, saves energy, and simplifies construction processes and equipment requirements. There are very few types of low-temperature curing agents, including polythioether-based and polyisocyanate-based varieties. In recent years, domestically developed and produced T-31-modified amines and YH-82-modified amines have both been capable of curing at temperatures below 0°C. There are many types of room-temperature curing agents, including aliphatic polyamines, alicyclic polyamines, low-molecular-weight polyamides, and modified aromatic amines. Medium-temperature curing types include certain alicyclic polyamines, tertiary amines, imidazoles, and boron trifluoride complexes. High-temperature thermosetting curing agents include aromatic polyamines, acid anhydrides, methyl phenolic resins, amino resins, dicyandiamide, and hydrazides.

The main methods to improve the curing speed of epoxy resin include selecting appropriate resin systems and curing agents. Modify the curing agent; Add appropriate accelerators. Room temperature amine curing agents can be modified by epoxy. addition, Mannis addition, Michael addition, thiourea addition, etc. Suitable accelerators, such as phenols and hydroxyl compounds, can also be added. High temperature curing systems often use synergistic matching of different curing agents and the addition of suitable accelerators, such as tertiary amines, organic ureas, imidazoles, metal compound complex salts, hydrazides, etc.

Seven Formulations for Fast-Curing Epoxy Adhesives

Formulation for Room-Temperature Curing High-Strength and High-Peel-Strength Epoxy Adhesives

Performance and application: This adhesive has high shear strength (20°C, 32.9 MPa) and peel strength (20°C, 6.1 kN/m) and strong resistance to water, oil, organic solvents, etc.

Formulation for J-182 Room-Temperature Fast-Curing High-Strength Epoxy Adhesive

Performance and Application: J-182 is an epoxy adhesive that can quickly cure at room temperature. It has the characteristics of high strength and easy use and is suitable for bonding between steel, polyoxymethylene, and other hard plastics.

Formulation for Room-Temperature Curing Epoxy Adhesives in Cryogenic Applications

Performance and application: The adhesive can be used at a temperature of -196~150°C and can bond various materials. It can be cured at room temperature for 24 hours or at 60°C for 4 hours.

Formulation for Room-Temperature Curing Epoxy Adhesives

Performance and Application: This adhesive can be used for bonding metal and some non-metallic materials. When used for bonding aluminum to aluminum, the shear strength is ≥ 19.6 MPa, the impact strength is ≥ 50 J/m², and the uneven pulling strength is ≥ 290 N/m.

Formulation for Medium-Temperature Curing One-Component Epoxy Adhesives

Performance and application: The adhesive has a fast gel speed, and the cured adhesive film is matt. It is mostly used for packaging printed circuits in the electronic industry.

While optimizing the curing speed is essential, the mechanical integrity of the bond often requires further toughening. For a deeper look at how to enhance structural strength through additives, refer to our comprehensive guide on Epoxy Adhesives: Reinforcement, Modification, and Formulations.

The curing temperature directly influences the cross-linking density and, consequently, the thermal stability of the adhesive. If your application involves high-temperature environments, you may also find our article on the Improvement of Heat Resistance and Formulations of Epoxy Adhesives highly relevant.

Formulation for Fast-Curing Epoxy Sealants

Performance and Application: This adhesive has good initial adhesion and fast solidification at room temperature underwater, making it an excellent material for leak sealing and joint sealing in underwater construction projects.

Formulation for Fast-Curing Surface Mount Adhesives (SMA) for Chip Components

In the electronics industry, fast curing is often paired with functional requirements such as electrical conductivity. For specialized electronics assembly, explore our detailed formulations for Conductive Epoxy Adhesives and Formulations.

KT-3767 latent curing agent

KT-401 latent curing agent