1、A novel glyoxal
Herein, the non-toxic and low-volatility glyoxal (G) is chosen to react with dimethylolurea (DMU) to prepare a novel and excellent water-resistant wood adhesive of glyoxal-dimethylolurea (G-DMU) resin.
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Glyoxal as a nonvolatile and nontoxic aldehyde, which can be used as a substitution of formaldehyde in wood industry to prepare novel melamine-glyoxal (MG) resins.
3、Preparation and properties of silica sol/melamine glyoxal resin
In this study, a composite modifier for wood impregnation is prepared, which is functional and environmentally friendly. The surface of silica sol was modified by using KH-560. The modified silica sol, melamine, and glyoxal were used as raw materials.
Preparation of Melamine
Through mass spectrometry and infrared spectroscopy, it was found that the chemical reactions occurred between melamine, urea and glyoxal, and the synthesized products were mainly oligomers with relative molecular mass less than 600. According to TG-DSC analysis, the resin began to cure after 90 ℃.
Structure and Properties of Soy Protein Adhesive Modified by Urea
Soy protein-based adhesive (SUG) was prepared using urea-glyoxal (UG) resin and soy protein isolate (SPI) as the main raw materials, and the solid content, viscosity, surface tension coefficient, contact angle, and bonding performance of the soy protein-based adhesive were tested.
A simple pathway for the preparation of an environmental and high
Here, a new glyoxal-polyvinylamine-urea (GPU) resin with excellent water resistance was developed in this work by using polyvinylamine (PVAm) as a modifier agent to enhance the water resistance of glyoxal-based resins.
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ABSTRACT Glyoxal as a nonvolatile and nontoxic aldehyde, which can be used as a substitution of formaldehyde in wood industry to prepare novel melamine-glyoxal (MG) resins.
Development of environmentally friendly glyoxal
To reduce the release of volatile organic compounds (VOCs) from formaldehyde-based adhesives at the source, the use of low-toxicity and biodegradable glyoxal instead of formaldehyde for the preparation of novel urea-glyoxal resins is a simple and promising strategy.
In Polymerization of Environment Friendly Melamine‐Urea‐Glyoxal Resin
In the study, we report that a safe and simple way for upgrading inferior rubber wood through the combined modification of environment-friendly MUG resin was synthesized from glyoxal, melamine, urea, and other additives.
Preparation and characterization of a melamine
In this study, a formaldehyde-free crosslinking agent, melamine-urea-glyoxal (MUG) resin for SM adhesive, was developed based on investigations of the effects of melamine content and storage time on the structure and properties of MUG resin and MUG-modified SM adhesive.
In modern industry, chemical engineering plays a pivotal role, particularly in the advancement of material science, which directly impacts product performance and longevity. Modified glyoxal resin, as a high-performance synthetic material, is increasingly valued for its applications across diverse fields. This article explores the properties, manufacturing processes, and practical potential of modified glyoxal resin.
Modified glyoxal resin typically refers to novel materials derived from natural or synthetic glyoxal resins through chemical or physical modification. These resins exhibit unique properties, such as excellent mechanical strength, chemical resistance, and processability, making them widely applicable in various industries.
Basic Properties of Glyoxal Resin Glyoxal resin is a thermosetting polymer with glyoxal as its monomer. Its molecular structure contains abundant functional groups, including hydroxyl, amino, and carbonyl groups. These groups provide diverse reactivity and modifyability, enabling glyoxal resin to react with various curing agents to form composite materials.
Modification Processes Researchers employ techniques such as graft polymerization, cross-linking, and copolymerization to introduce new functional groups or alter molecular structures. These modifications tailor properties like heat resistance, wear resistance, and electrical insulation to meet specific application demands.
Manufacturing Steps
- Raw Material Selection: Choose appropriate glyoxal monomers and auxiliary materials.
- Prepolymer Formation: Polymerize raw materials via chemical reactions.
- Modifier Integration: Introduce modifiers into the prepolymer through further reactions.
- Curing and Processing: Finalize the product via curing and shaping processes.
Applications Modified glyoxal resin is extensively used in:
- Electronics/Electrical Industries: As adhesives, encapsulation materials, and insulating layers for circuit boards.
- Automotive Industry: As coatings and adhesives for vehicle body repairs.
- Other Fields: Construction, textiles, packaging, and more.
Challenges Despite its advantages, modified glyoxal resin faces limitations:
- High production costs and complex manufacturing hinder large-scale adoption.
- Performance gaps persist under extreme conditions (e.g., high temperatures, pressures).
Future Directions To address these challenges:
- Nanotechnology: Incorporate nanoparticles to enhance mechanical and electrical properties.
- Sustainable Materials: Use bio-based additives to reduce costs and environmental impact.
- Process Innovation: Develop novel catalysts and reaction conditions to improve modification efficiency.
Modified glyoxal resin holds broad application prospects due to its superior properties. While technical and economic challenges remain, ongoing research promises advancements that will expand its utility and performance in future industries.
