1、Eco
To address these issues, in this study, we reported a facile and green approach for preparing epoxy-terminated polyurethane (EPU)-modified epoxy resins with different EPU contents. It was found that the toughness of the epoxy resin was significantly improved after the addition of EPU.
2、Research progress on polyurethane‐modified epoxy resins
This paper summarizes polyu-rethane-modified epoxy resins for pavement repair, referring to their mechanical properties, adhesive properties, durability and toughness, corrosion resistance, and heat resistance.
3、Preparation and properties of polyurethane/epoxy
Motivated by this, the researchers tried to replace partial epoxy resin (EP) with PU. The resulting composite-modified binder prepared combines the excellent high-temperature stability and water stability of epoxy asphalt binder and the low-temperature crack resistance of PU-modified asphalt binder.
4、Research for Epoxy Modified Polyurethane Resin Technology
Abstract The epoxy modified polyurethane resin can be prepared under the catalyst action of isocyanate monomer and linear thermoplastic polyurethane elastomer and bisphenola epoxy resin. Through the micrograph analysis: the preparation of resin membrane surface is glossiness higher and pore less.
Research progress on polyurethane
When epoxy resins are modified by PU and used for repair materials, PU provides flexibility while epoxy resins provide strength. Therefore, PU modification can improve epoxy toughness and ductility without compromising strength.
Preparation and characterization of polyurethane composite
To develop a bonding material suitable for colored anti-skid road surfaces, this study prepared a composite modified epoxy resin by modifying epoxy resin with polyurethane, nano-SiO2, and diluent 669.
Eco
To address these issues, in this study, we reported a facile and green approach for preparing epoxy-terminated polyurethane (EPU)-modified epoxy resins with different EPU contents. It was found that the toughness of the epoxy resin was significantly improved after the addition of EPU.
Research progress on polyurethane
This paper summarizes polyurethane-modified epoxy resins for pavement repair, referring to their mechanical properties, adhesive properties, durability and toughness, corrosion resistance,...
Properties of polyurethane
Dive into the research topics of 'Properties of polyurethane-modified epoxy resin encapsulating materials filled with glass fiber'. Together they form a unique fingerprint.
High
Additionally, by adjusting the PU content in the EP-PU system, the degree of crosslinking in the EP-PU molecular chain can be controlled, resulting in excellent adhesion, alkali resistance, hydrophobicity, mechanical properties, low water absorption, and good thermal stability.
In the field of modern materials science, polyurethane (PU) and epoxy resin (EP) are two critical polymeric materials, each possessing unique properties and application advantages. With the advancement of technology and industrial development, modifying these materials to achieve superior performance has become a research focus. The primary objectives of polyurethane-modified epoxy resins involve chemically bonding or physically blending the two to enhance mechanical properties, chemical resistance, and processability, thereby meeting specific application requirements.
1. Improving Mechanical Strength The introduction of polyurethane significantly improves the mechanical strength of epoxy resins. While epoxy resins exhibit excellent electrical insulation and chemical stability, they are brittle and lack impact resistance. Polyurethane incorporates into the matrix through hydrogen bonding, forming a cross-linked network that enhances toughness and impact resistance. Additionally, its elasticity absorbs energy, slowing crack propagation and improving fracture resistance. For example, in wear-resistant coatings, adding polyurethane increases abrasion resistance and extends service life.
2. Enhancing Corrosion Resistance Epoxy resins degrade when exposed to strong acids, alkalis, or other corrosive chemicals. Incorporating polyurethane creates a protective layer on the resin surface, blocking chemical penetration and internal reactions. This modification dramatically improves corrosion resistance. In anti-corrosion coatings, polyurethane-modified epoxy matrices enhance salt spray resistance, ensuring stability in harsh environments.
3. Improving Processability Epoxy resins, being thermosetting, require high-temperature curing, which often leads to issues like bubbles or cracks. Polyurethane reduces viscosity, enabling lower-temperature processing with better fluidity and reduced shrinkage during curing. Its elasticity also adjusts the cured material’s hardness and flexibility, aligning with practical needs.
4. Broadening Application Range Polyurethane-modified epoxy resins find applications in high-performance composites, specialty coatings, and electronic encapsulants. In aerospace, they create lightweight, high-strength structural components; in automotive manufacturing, they protect engine parts against wear and corrosion; in electronics, their electrical insulation and moisture resistance make them ideal for circuit board encapsulation.
The purpose of polyurethane-modified epoxy resins is to overcome the limitations of traditional epoxies by combining chemical/physical modifications to enhance mechanical properties, chemical resistance, and processability. This interdisciplinary effort, spanning materials science and processing technology, represents a key research direction. With ongoing advancements, polyurethane-modified epoxy resins are poised to unlock new potential across diverse fields.
