废报纸与木质刨花制备复合刨花板的工艺研究

Manufacturing technology of composite particleboard using waste newspaper and wood particles

【目的】为废纸资源化利用奠定基础,创造重要的经济、生态和环境效益。【方法】以杂木刨花和回收废旧报纸为原料,通过胶合和高温热压相结合的方法制备废纸–木复合刨花板,研究废报纸添加量、环保脲醛树脂胶施胶量和热压工艺等因素对复合刨花板的静曲强度(MOR)、弹性模量(MOE)、内结合强度(IBS)和吸水厚度膨胀率(TSR)等物理力学性能的影响。【结果】脲醛树脂胶黏剂(UF)施胶量11%、废报纸用量10%、自制石蜡乳液添加量1.0%、热压温度190℃、热压时间(以热压1 mm计)为34 s工艺条件下制备的复合刨花板,游离甲醛释放量为0.022 4 mg·g^(-1)(穿孔萃取法),远低于国标GB 18580—2001 E1级的限量阈值(0.090 0 mg·g^(-1));MOR、MOE和IBS分别为20.43、3 431.00和0.57 MPa,TSR为1.7%,性能指标均远超过GB 4897—2015中干燥状态下使用的家具型(P2型)刨花板的技术指标。【结论】废报纸与木刨花制备复合刨花板是一种有效的废纸利用途径。

【Objective】To provide a basis for wastepaper recycling and create important economic,ecological and environmental benefits.【Method】Composite particleboard was manufactured using waste newspaper and wood particles of mixed wood species with adhesives under hot pressing.Effects of the addition amount of wastepaper,amount of urea formaldehyde resin(UF),and hot pressing parameters on physical and mechanical properties including the modulus of rupture(MOR),modulus of elasticity(MOE),internal bonding strength(IBS)and thickness swelling rate(TSR)of composite particleboard were studied.【Result】The optimal manufacture parameters were 11%UF,10%wastepaper and 1.0%self-made wax emulsion under 190℃of hot pressing temperature and pressing 34 s·mm–1.The formaldehyde emission from the manufactured composite particleboard was 0.002 4 mg·g–1 using the perforator method,which was much lower than the threshold value of 0.009 0 mg·g–1 for E1 level based on the GB 18580-2001 standard.The MOR,MOE and IBS were 20.43,3 431 and 0.57 MPa respectively,and the TSR was 1.7%.These properties exceeded the requirements of P2-type particle board at dry condition according to GB 4897-2015 standard.【Conclusion】It is an effective way to utilize wastepaper and wood particles for producing composite particleboard.