工艺参数对生物油酚醛树脂胶合板甲醛和TVOC含量的影响

为探究制胶阶段和压板阶段的6个因素(生物油替代率、醛酚比、热压温度、热压时间、热压压力、涂胶量)对胶合板中甲醛和总挥发性有机物(TVOC)含量的影响,在单因素试验基础上,设计L25(56)正交试验对工艺参数进行优化.采用顶空固相微萃取法(HS-SPME)和气相色谱/质谱(GC/MS)联用技术对生物油酚醛树脂胶合板(BP...

Effect of Process Parameters on Formaldehyde and TVOC Content in Plywood Bonded with Bio-oil Phenol Formaldehyde Resins

To explore the effects of 6 factors (bio-oil replacement ratio, molar ratio of formaldehyde and phenol (n_F/n_P), hot press temperature, pressure and time, and amount of adhesives) of the resin preparation and hot press processes on the content of formaldehyde and total volatile organic compounds (TVOC) in the bio-oil phenol formaldehyde plywood (BPFP) panels, an L₂₅ (5⁶) orthogonal experiment design was executed. Head space solid-phase micro-extractions (HS-SPME) combined with gas chromatography/mass spectrometry (GC/MS) was employed to detect the content of free formaldehyde and TVOC in the BPFP panels. The results showed that under the conditions of the bio-oil replacement ratio of 60%, n_F/n_P of 1.6, hot press temperature of 190 ℃, hot press duration of 4 min, hot press pressure of 1.2 MPa, and amount of adhesives applied of 200 g/cm², formaldehyde emissions was the lowest. Hot press temperature and pressure had a significant effect on the formaldehyde content, whereas the replacement ratio of fast pyrolysis bio-oil to phenol and the amount of wood adhesives applied had a minor effect. Under the conditions of bio-oil replacement ratio of 60%, n_F/n_P of 2.2, hot press temperature of 190 ℃, hot press duration of 5.5 min, hot press pressure of 1.4 MPa, and amount of adhesives applied of 210 g/cm², the content of TVOC in the plywood was the lowest.