1、Surface modification of self

Poly (urea-formaldehyde) (PUF) microcapsules, which are used as self-healing component of fibre reinforced resin matrix composites, were prepared by in situ polymerization method.

2、Thermal curing kinetics of urea

In this study, hydroxyapatite (HA) was surface modified with silane coupling agent. The modified HA was named HA-APTES, and its structure was analyzed. Hydroxyapatite modified urea-formaldehyde resin (HUF) were prepared by adding different amounts of HA-APTES in the synthesis process.

3、Surface Modification of Poly(urea

The surfaces of poly (urea-formaldehyde) (PUF) were modified by γ -glycidoxypropyltrimethoxy silane (KH560) in order to improve the interfacial bonding between self-healing PUF microcapsules and epoxy matrix.

4、Research Progress on Coupling Agent

This research was conducted to investigate the effect of silane coupling agent usage to improve the bond formation of urea formaldehyde resin in wheat straw particleboard production.

5、Thermal curing kinetics of urea

In this study, hydroxyapatite (HA) was surface modified with silane coupling agent. The modified HA was named HA-APTES, and its structure was analyzed. Hydroxyapatite modified urea-formaldehyde resin (HUF) were prepared by adding different amounts of HA-APTES in the synthesis process.

Surface Modification of Attapulgite and Its Application in Urea

Attapulgite with rod-like and porous structure added in the process of synthesizing urea-formaldehyde resin was used to improve effectively the whole application performance of urea-formaldehyde resin.The influences of attapulgite before and after modified using silane coupling agent (KH-792) on the free formaldehyde content,the shear strength ...

Amino

TGA results showed that the maximum silane grafting occurs at pH 7.5. It was found that the addition of APS-treated microcapsules had a positive effect on the tensile properties of the coating due to improving microcapsule’s shell and polymer matrix compatibility.

Surface modification of self

Surface modification of self-healing poly (urea-formaldehyde) microcapsules using silane-coupling agent

Surface modification of self

Abstract Poly (urea-formaldehyde) (PUF) microcapsules, which are used as self-healing component of fibre reinforced resin matrix composites, were prepared by in situ polymerization method.

Types and Applications of Urea

Modifying urea-formaldehyde resins with silane coupling agents substantially improves coating adhesion and water resistance, which is crucial for applications in coatings and adhesives.

In the field of modern building materials, urea-formaldehyde (UF) resin is widely used for bonding wood, paper, plastics, ceramics, and other materials due to its excellent adhesive properties, low cost, and ease of application. UF resin has poor water resistance and chemical resistance, which limit its use in complex environments. To overcome these limitations, silane coupling agents, as surface modifiers, are highly favored due to their good chemical stability, excellent hydrophilicity, and enhanced interfacial bonding capabilities. This article explores how silane coupling agents modify UF resin and demonstrates their advantages in practical applications.

Basic Characteristics of Silane Coupling Agents

Silane coupling agents are organic-inorganic hybrid materials containing silicon-oxygen bonds. They react with hydroxyl groups on substrate surfaces to form stable chemical bonds. This structure imparts strong hydrophobic properties, significantly improving the water and chemical resistance of the resin. Additionally, silane coupling agents enhance mechanical strength and thermal stability, thereby improving the overall performance of the resin.

Effects of Silane Coupling Agents on UF Resin Modification

1. Improved Adhesive Strength: Modified UF resin exhibits substantially enhanced adhesive strength. Silane coupling agents react with hydroxyl groups in UF resin to form stable chemical bonds, increasing its cohesive strength. The hydrophobic effect of silane coupling agents also reduces water penetration between the resin and substrate, further improving adhesion.

2. Enhanced Water Resistance: The water resistance of modified UF resin is significantly improved. Silane coupling agents effectively block water from entering the resin, preventing aging and degradation. Their hydrophobic properties also reduce interactions between the resin and moisture, further boosting water resistance.

3. Improved Chemical Resistance: Modified UF resin shows better resistance to chemicals. Silane coupling agents protect the resin from chemical erosion and reduce interactions between the resin and chemicals, enhancing overall chemical resistance.

4. Increased Thermal Stability: The thermal stability of modified UF resin is notably improved. Silane coupling agents enable the resin to maintain stable performance at higher temperatures. Their hydrophobic effects also reduce interactions with steam generated under high temperatures, further improving heat resistance.

Applications of Silane-Modified UF Resin

1. Construction Industry: In construction, silane-modified UF resin is used for bonding wood, stone, metals, and other materials. By improving adhesive strength, water resistance, and chemical resistance, it extends the lifespan of buildings and reduces maintenance costs.

2. Electronics Industry: For circuit boards and electronic components, modified UF resin ensures stability and reliability by enhancing adhesion and resistance to environmental factors, reducing failure rates.

3. Automotive Manufacturing: In automotive interiors and parts, silane-modified UF resin ensures component integrity and safety through improved adhesion and durability, enhancing overall vehicle performance.

4. Aerospace: In aerospace, modified UF resin secures aircraft and spacecraft components, meeting extreme environmental requirements while ensuring stability and safety.

Silane coupling agent-modified UF resin improves adhesive strength, water resistance, chemical resistance, and thermal stability. Its applications span construction, electronics, automotive manufacturing, and aerospace. With advancements in technology and stricter environmental standards, research and application of silane-modified UF resin will deepen, contributing significantly to human development.