1、Photocatalytic Oxidation of Technical Lignin to Potent Modifiers for
Abstract Modifications of urea-formaldehyde (UF) resin to achieve better bonding performance and lower formaldehyde emission are still an alluring task in the wooden composite industry.
2、Characterization and properties of phenolic resin doped modified lignin
The depolymerized lignin monomer replaced phenol by 50 wt% and then ternary co-polymerized with phenol and formaldehyde to form a biomass phenol-based phenolic resin, providing a green route for phenolic resin production.
3、Bonding wood with uncondensed lignins as adhesives
We contend that condensation of lignin under an elevated temperature is similar to the curing of wood adhesives such as phenol–formaldehyde and urea–formaldehyde resins during hot...
4、Modification of plywood with phenol–formaldehyde resin: substitution of
In this study, microwave-assisted pyrolysis cleavage products of softwood kraft lignin have been used to substitute 30% of phenol in phenol–formaldehyde resins. Scots pine veneers were impregnated with the resin, and five-layered plywoods were produced.
Advances in Lignin Chemistry, Bonding Performance, and Formaldehyde
Key advances in lignin modification, bonding performance, and strategies for reducing formaldehyde emissions are critically discussed, highlighting pathways toward greener wood adhesive technologies.
A Comparison among Lignin Modification Methods on the Properties of
The LPF resin characteristics can be influenced by the different types of chemical materials used and the modification processes of lignin. Hence, this work aims to compare the best proposed modification methods of lignin for use in a PF resin.
Synthesis and evaluation of fluid loss reducer by modifying lignite
A fluid loss reducer was obtained with excellent temperature and salt tolerance through modifying lignite with phenolic urea-formaldehyde resin. A series of tests were carried out on the...
Preparation of chemically modified lignin and its application in
Various Preparation Methods of Modified Lignin. The wide application range of modified lignin was introduced. Offers valuable insights into the green and sustainable production of modified lignin.
The role of lignin in adhesives for lignin
In this paper, the recent research progress and challenges of lignin formaldehyde-based resin adhesives and adhesives directly prepared with low condensation degree lignin were reviewed.
Advances of Modified Lignin as Substitute to Develop Lignin‐Based
In this review, the latest progress in the preparation of PF resin adhesives via lignin modification, including chemical, physical, and biological modifications, is discussed.
With the continuous growth of global energy demand, the massive combustion of traditional fossil fuels has led to severe environmental issues, such as greenhouse gas emissions and air pollution. developing renewable energy sources and seeking alternative energy technologies have become critical to addressing these challenges. Lignite, a widely distributed coal resource in China and globally, is limited in its application during energy conversion due to its high carbon content and low calorific value. To enhance the energy utilization efficiency of lignite and reduce environmental pollution, modifying it through technological means is particularly important. Phenolic urea-formaldehyde resin (PUFR) is considered an effective material for lignite modification due to its excellent chemical stability, mechanical strength, and plasticity. This paper explores the current applications, research progress, and future prospects of PUFR in lignite modification.
1. Basic Properties and Applications of Phenolic Urea-Formaldehyde Resin
Phenolic urea-formaldehyde resin is a high-molecular-weight compound synthesized through the polymerization of phenolic resin and formaldehyde. It exhibits strong adhesive properties, water resistance, and heat resistance. The presence of numerous hydroxyl and amino groups in its structure enables PUFR to undergo chemical reactions with various substances, making it widely used in wood preservation, paper bonding, and construction materials. In the coal industry, PUFR is primarily employed as an additive during coal processing to improve compressive strength and abrasion resistance.
2. Significance and Challenges of Lignite Modification
As a carbon-rich coal resource, lignite has low energy conversion efficiency and generates substantial harmful substances during combustion. Modification can enhance its energy utilization while mitigating environmental impacts during burning. PUFR, as a novel modifier, improves the physical properties of lignite, boosts thermal stability, and enhances resistance to hydration. challenges remain in the modification process, including unstable outcomes, cost control, and environmental concerns.
3. Research Progress on PUFR in Lignite Modification
In recent years, researchers have conducted in-depth studies on the application of PUFR in lignite modification. Studies have shown that adding an appropriate amount of PUFR to lignite significantly improves compressive strength and abrasion resistance while maintaining its low calorific value. Additionally, PUFR effectively inhibits water migration in lignite, enhancing thermal stability. Nevertheless, research on PUFR-modified lignite is still in its early stages, requiring further exploration of optimal modification conditions and process parameters.
4. Future Prospects and Development Directions
In the future, with the growing emphasis on green energy and sustainable development, research and application of lignite modification technologies will attract broader attention. PUFR is expected to become a key focus in lignite modification studies. Researchers must continue optimizing PUFR formulations and preparation methods to achieve optimal application effects. considering environmental protection requirements, future efforts should prioritize the development of more eco-friendly modifiers to minimize environmental impacts during the modification process.
As an effective lignite modification material, phenolic urea-formaldehyde resin has demonstrated significant potential across multiple research fields. Studies on PUFR-modified lignite not only improve energy utilization efficiency but also reduce environmental pollution, enabling sustainable use of coal resources. Despite current challenges, advancements in technology and deeper research will likely expand the role of PUFR in lignite modification in the future.
