Abstract
In order to study the effect of biomass on the pyrolysis characteristics of urea-formaldehyde resin, the thermogravimetric experiments were carried out respectively using urea-formaldehyde resin (UF), rice straw (RS), and their mixed pellets with different proportions. The pyrolysis kinetics analysis was conducted. The results showed that the pyrolysis process of UF resin and mixed pellets could be divided into three stages: the drying and dehydration of the material, the rapid decomposition of volatile matter, and residue decomposition. The reaction order of UF resin and mixed pellets was discussed using the Coats–Redfern method, the activation energy of UF resin was 54.27 kJ/mol, and this value decreased with the addition of rice straw. As the mass ratio of UF resin to rice straw was 3:1, the activation energy achieved the lowest value, which means that the addition of rice straw was beneficial to the pyrolysis process of UF. In the process of pellet preparation, the falling strength and compressive strength of UF resin pellets can be improved by adding an appropriate proportion of rice straw. In this test, the yield of pyrolytic carbon reached the highest value of 23.93%, as the mass ratio of UF resin to rice straw was 3:2. When the mass ratio was 4:1, the highest liquid product yield of 43.21% was achieved.
Highlights
Because it is the main building material of wood products such as furniture, the production of the wood-based panel in China has reached 299.09 million m3 in 2018 (NFGA, 2019)
Characteristics of eucalyptus, eucalyptus added with 10 %urea-formaldehyde resin (UF) resin, eucalyptus added with 10% MUF resin, UF resin, and MUF resin and found that UF resin and MUF resin can reduce the energy required for eucalyptus pyrolysis
The TG method was used to study the co-pyrolysis of UF and rice straw (RS)
Summary
Because it is the main building material of wood products such as furniture, the production of the wood-based panel in China has reached 299.09 million m3 in 2018 (NFGA, 2019). Adhesives account for about 10% of wood substrates. These adhesives include urea-formaldehyde resin (UF), phenol-formaldehyde resin (PF), and melamine-formaldehyde resin (MF), among which UF resin is the most commonly used adhesive (Gu, 2015). Pyrolysis technology can convert particleboard into value-added chemicals, such as improved biochar for fuel combustion (Ying et al, 2022). These studies provide a more valid basis for the recycling of urea-formaldehyde resin. In terms of practical engineering application, in order to reduce the difficulty of pretreatment, many researchers try to pyrolysis the mixture of UF resin and biomass to study the effect of UF resin on biomass pyrolysis.
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