Low carbon preparation process and properties of graphite doped particleboard
Wood and other plant materials have low thermal conductivity,resulting in inefficient heat transfer during the hot-pressing process of particleboards,which hinders the achievement of the"Double carbon"goal.To address this challenge,this study introduced graphite,a material with excellent thermal conductivity,and investigated the effects of different graphite additions(1％,3％,5％),mass ratios(1∶1∶1,0.5∶1∶1.5,1.5∶1∶0.5)of graphite with different particle sizes(45,11,6.5 µm),and hot-pressing temperatures(150,170,190 ℃)on the physical and mechanical properties of particleboard and its density distribution.Changes in internal temperature and water vapor pressure of the particleboard during hot-pressing were also examined.The results showed that the bending strength,modulus of elasticity,internal bonding strength,and screw withdrawal of particleboard were significantly influenced by graphite additions,while the 24 h thickness swelling rate of particleboard was mainly affected by graphite particle size ratios.With the increase of graphite addition(l％-5％),the internal bonding strength,modulus of elasticity,bending strength,24 h thickness swelling rate,and screw withdrawal of particleboard decreased.At a graphite addition of 1％,the internal bonding strength of particleboards prepared under hot-pressing temperatures of 150,170,and 190℃ increased by 13.2％,30.4％and 9.8％,respectively,compared to the particleboard without graphite added.The minimum 24 h thickness swelling rate of particleboard was achieved with a graphite particle size ratio of 1∶1∶1.The performance of particleboard improved with increasing hot-pressing temperature,when the graphite particle size ratio and addition amount were fixed at 1∶1∶1 and 1％,the introduction of graphite increased the temperature and steam pressure inside the slab during hot-pressing at 150,170 and 190 ℃,especially at lower hot-pressing temperatures.At hot-pressing temperature of 150 ℃,the addition of graphite caused the core temperature of the slab to be higher than that of the particleboard without graphite added at a hot-pressing temperature of 170 ℃ in the first 180 s of the hot-pressing process.Meanwhile,the addition of graphite also enhanced the thermal conductivity of particleboard,further optimizing the efficiency of the hot-pressing process.Considering all factors,the optimal graphite addition process can be achieved by the addition of 1％graphite,with 1∶1∶1 graphite particle size ratio,and using hot-pressing temperature of 150 ℃.
graphiteparticleboardlow carbon manufacturingheat conductionhot-pressing process
国家科技期刊平台
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