1、Polyurethane

By incorporating a room-temperature curing agent phenol-aldehyde amine (PAA) to construct an interpenetrating polymer network (IPN), we developed a polyurethane (PIDE)-modified epoxy system (Fig. 1b), forming a robust net-like crosslinking structure.

2、Epoxy Curing Agents

Clear and pigmented coatings based upon Amicure® IC curing agents exhibit very rapid hardness development, excellent low temperature cure, very good color and UV stability and excellent surface appearance.

3、Curing Agent: Types & Process of Curing Agents for Epoxy Resin

Explore the main types of curing agents & various crosslinking methods which help to improve the polymerization process to select the right curing agent for coating formulation.

4、Accelerating the Curing of Hybrid Poly (Hydroxy Urethane)

In this work, a system that combines an amino-terminated PHU (NH 2 –PHU–NH 2), an epoxy resin, and a thiol compound was employed to develop high-shear strength PHU-epoxy hybrid adhesives able to cure at room temperature in short times.

5、Toughening and corrosion resistance enhancement of waterborne epoxy

In this study, a flexible epoxy curing agent capable of room-temperature curing was prepared, and the effects of polyurethane (PU) content and capping agents on the toughness and corrosion resistance of films were systematically investigated.

Research progress on polyurethane

The polyurethane modification mechanism and the efect of curing agent on the properties of polyurethane-modified epoxy resins are discussed. Pol-yurethane-modified epoxy resins show potential to combine the strengths of both polyurethanes and epoxy resins for advanced pavement repair materials.

Blocked isocyanates as alternative curing agents for epoxy

Presented research shows the results of a study on the synthesis and mechanical properties of materials obtained by crosslinking polyaddition bio-products with blocked isocyanate based on toluene diisocyanate (TDI) as curing agent.

Co

In summary, to enhance the toughness of epoxy resin adhesives, HTPB was introduced into the polyurethane system, successfully developing a solvent-free, room-temperature curing epoxy resin adhesive.

3 Types of Polyisocyanate Curing Agents

The resulting modified polyurethane curing agent not only exhibits a certain degree of hydrophilicity but also encapsulates the residual isocyanate groups (NCO groups), enabling them to remain stable in water for a period of time.

Effect of Curing Agent Type on Curing Reaction Kinetics of Epoxy Resin

In this paper, low molecular weight polyamides, aromatic amines and anhydrides were selected as three kinds of curing agents and their isothermal viscosity-time properties were studied to...

Research and Application of Curing Agents for Polyurethane-Modified Epoxy

With the advancement of technology and industrial development, materials science has become increasingly critical in various fields. Particularly in industries such as construction, automotive, aviation, and electronics, high-performance composite materials are widely used in diverse products. Among these, curing agents for polyurethane-modified epoxy, as a novel material, have attracted significant attention due to their excellent properties. This paper introduces the research progress, preparation methods, and practical advantages of curing agents for polyurethane-modified epoxy.

1. Research Background

Polyurethane (PU) is a polymer material with good elasticity and flexibility, commonly used in shoe soles, mattresses, toys, and other fields. Epoxy resin, on the other hand, is a thermosetting resin known for its high adhesive strength, chemical resistance, and mechanical toughness, often employed in structural components and coatings. Combining polyurethane with epoxy resin can produce composite materials with superior performance.

2. Preparation Methods for Curing Agents

1. Preparation of Polyurethane Prepolymer: A diol and catalyst are added to a reactor and polymerized at a specific temperature to obtain a polyurethane prepolymer. By adjusting parameters such as catalyst dosage and reaction time, prepolymers with different molecular weights can be synthesized.

2. Introduction of Epoxy Groups: The polyurethane prepolymer is mixed with epoxy monomers and subjected to polymerization under controlled conditions. This enables cross-linking between urethane bonds in the prepolymer and epoxy groups, forming the curing agent.

3. Post-Treatment of the Curing Agent: The synthesized curing agent undergoes post-processing steps, including drying, grinding, and sieving, to enhance its performance.

3. Performance Characteristics

1. Excellent Adhesion: The curing agent exhibits strong adhesion to various substrates.

2. Superior Mechanical Properties: It offers high strength and toughness, meeting the requirements of structural components.

3. Chemical Resistance: The curing agent demonstrates outstanding resistance to chemicals, suitable for harsh environments.

4. Wear Resistance: It possesses high wear resistance, withstanding prolonged friction and abrasion.

5. Environmental Friendliness: The curing agent is non-toxic, pollution-free, and compliant with environmental standards.

4. Practical Applications

1. Construction: Used in structural components and coatings to improve durability and aesthetics.

2. Automotive Industry: Applied in interior parts and seats to enhance safety and comfort.

3. Aerospace: Utilized in aircraft components and engine parts to boost performance and reliability.

4. Electronics: Employed in electronic components and circuit boards to increase stability and lifespan.

Curing agents for polyurethane-modified epoxy, as a novel material, offer exceptional performance and broad application prospects. Research on their preparation methods and characteristics provides valuable insights for material selection and application in related fields. In the future, with ongoing advancements in materials science, these curing agents are expected to play a pivotal role in more industries.