脲醛树脂(UF)胶粘剂的胶合强度高、价格低廉,在木材加工业应用广泛,但是UF化学结构不稳定,在使用过程中会不断释放出甲醛,危害环境。以造纸行业的废弃物——木质素磺酸钠为原料,通过纯化-活化-预聚的工艺,合成了一种新型木质素磺酸钠预聚体。该预聚体结构中的多个胺基可与脲醛树脂中的羟甲基和游离甲醛反应,改善了UF不稳定结构,减少了甲醛来源,同时可以提升树脂的胶合强度。使用上述预聚体改性的UF胶粘剂制备的胶合板粘结强度高,甲醛释放量达到E0级标准,小于0.5mg/L。
Urea-formaldehyde resin (UF resin) has many advantages such as high bonding strength and low cost.It is widely used in wood processing industry.However,the plywood based on UF resin will release formaldehyde from the unstable chemical structure which is harmful to human beings.A new kind of prepolymer modifier based on sodium lignosulfonate (SL) from the waste of papermaking industry was synthesized.The raw SL was purified,activated and then reacted with melamine to get SL-prepolymer.The prepolymer had many amine groups which can react with hydroxymethyl and free formaldehyde in UF resin to reduce the formaldehyde emission.And the introduction of aromic rings from SL and triazine rings from melamine could modify the unstable structure of UF resin.The plywood made from the modified UF resin exhibited great bonding strength,and its formaldehyde emission reached E0 standard of <0.5mg/L.
[1] 邸明伟,王森,姚子巍.木质素基非甲醛木材胶黏剂的研究进展[J].林业工程学报,2017,2(1):8-14.
[2] 张应龙,韦珍珍,张锐昌,等.木质素作为化学工业基础原料的研究及应用[J].化工新型材料,2012,40(5):132-135.
[3] 张燕如,宋艳娜,董瑞雪,等.碱木质素催化酚化改性的研究[C].西安:中国造纸学会学术年会,2016.
[4] 陈媛媛,蒙壮壮,韩杰,等.改性木质素酚醛树脂胶粘剂的研究进展[J].广州化工,2016,44(16):13-17.
[5] 张雅静,马榴强.木质素改性三聚氰胺甲醛树脂发泡材料的研究[J].化工新型材料,2012,40(8):109-110.
[6] 何金存,郭明辉,王宏棣.国内木质素改性合成酚醛树脂的研究进展[J].化工新型材料,2012,40(9):7-8.
[7] 马灼明,李淑君,杨冬梅.酶解木质素的活化及用于酚醛树脂的制备[J].森林工程,2017,33(2):64-67.
[8] 罗雄飞,李新生,王哲东,等.超声活化酶解木质素用于酚醛树脂的制备[J].森林工程,2017,33(3):39-43.
[9] 胡春平,方桂珍,王献玲,等.麦草碱木质素基环氧树脂的合成[J].东北林业大学学报,2007,35(4):53-55.
[10] 孙其宁,秦特夫.木质素活化及在木材胶黏剂中的应用进展[J].高分子通报,2008(9):55-60.
[11] 穆有炳,王春鹏.低游离甲醛羟甲基化木质素磺酸盐-酚醛复合胶黏剂研究[J].林产化学与工业,2009,29(3):38-42.
[12] Khan M A Ashrafa S M,Malhotra V P,et al.Development and characterization of a wood adhesive using bagasse lignin[J].International Journal of Adhesion & Adhesives,2004,24(6):485-493.
[13] 高小娥.碱木质素漆酶活化工艺及用于酚醛树脂的研究[J].木材加工机械,2017,28(2):23-26.
[14] 夏成龙.微波辅助木质素改性及其酚醛树脂固化动力学研究[D].北京:中国林业科学研究院,2016.
[15] 彭园花,曾祥钦,卢红梅.木质素的提纯及其在脲醛树脂胶粘剂中的应用[J].当代化工,2006,31(6):377-379.
[16] Raskin M,Ioffe L O,Pukis A Z.Composition board binding material:US6291558[P].2001-09-18.
[17] 刘源松,关明杰,张志威,等.木质素改性脲醛树脂对竹层积材甲醛释放量及胶合性能的影响[J].林业工程学报,2017,2(3):28-32.
[18] Sudan V.Process for preparing a black liquor-phenol formaldehyde thermoset resin:US6632912[P].2003-10-14.
PDF
(1548KB)
