Chestnut bur is an agro-waste material generated in the chestnut production. It is a tannin-rich lignocellulosic material which might be a promising raw material for low-formaldehyde composite particleboard production when using urea–formaldehyde (UF) as bonding adhesive. In this study, the characteristics of chestnut bur were analyzed to assess its application value for composite panel. Five-type particleboards were manufactured from the mixture of chestnut bur/poplar particles with the weight ratios of 0/100, 25/75, 50/50, 75/25 and 100/0, UF resin was used as bonding adhesive. The effects of the addition amount of chestnut bur on the physical, mechanical properties and formaldehyde emission of particleboard were studied. The results showed as follows: (1) chestnut bur showed low cellulose, hemicelluloses and lignin contents, but high extractives and ash contents compared with poplar wood. Chestnut bur and poplar wood had the similar fiber morphology. (2) Composite board with relatively good performances could be manufactured with mix particles of chestnut bur and poplar wood. With the increasing of chestnut bur content, the mechanical properties of the composite board decreased, whereas the dimensional stability increased. (3) The total phenol content in the chestnut bur was as high as 13.79%. The phenolic substance in the chestnut burs could react with free formaldehyde. Hence, the free formaldehyde emission of particleboard was effectively reduced. In summary, waste chestnut bur is a suitable material which can not only be utilized as the base material, but also a natural free formaldehyde scavenger for composite particleboard production.

中文翻译：

---

用废板栗bur制造的低甲醛排放复合刨花板

栗子bur是栗子生产中产生的一种农业废物。它是一种单宁含量丰富的木质纤维素材料，当使用脲醛（UF）作为粘合粘合剂时，可能是低甲醛复合刨花板生产的有前途的原料。在本研究中，对板栗的特征进行了分析，以评估其在复合板中的应用价值。由重量比为0 / 100、25 / 75、50 / 50、75 / 25和100/0的栗子bur /杨树颗粒的混合物制成五种刨花板，使用UF树脂作为粘结粘合剂。研究了板栗的添加量对刨花板物理，力学性能和甲醛释放量的影响。结果表明：（1）板栗bur纤维素，半纤维素和木质素含量低，但与杨木相比，萃取物和灰分含量较高。板栗和白杨木具有相似的纤维形态。（2）用板栗针刺和杨木的混合颗粒可以制造性能相对较好的复合板。随着板栗含量的增加，复合板的力学性能下降，尺寸稳定性增强。（3）板栗中的总酚含量高达13.79％。板栗中的酚类物质可与游离甲醛反应。因此，有效减少了刨花板的游离甲醛释放量。总之，废板栗waste是一种合适的材料，不仅可以用作基础材料，而且还可以用作天然天然甲醛清除剂，用于复合刨花板的生产。