【作者】 朱丽滨；

【导师】 顾继友；

【作者基本信息】 东北林业大学 ， 木材科学与技术， 2005， 博士

【摘要】 我国目前人造板生产量已超过4500万m³,基本上都使用脲醛（UF）树脂胶粘剂,并且多使用高甲醛释放量的UF树脂,造成甲醛释放量超标,严重污染生产环境与木材胶合制品的使用环境,已经成为严重的社会问题。为此,国家于2002年1月公布了“室内装饰装修材料人造板及其制品甲醛释放限量”强制标准,限制人造板生产企业必须使用低甲醛释放的UF树脂。因此,研究低甲醛释放UF树脂的固化反应机理,是关系到我国人造板工业发展的应用基础理论问题,也是影响低甲醛释放UF树脂胶粘剂深度开发和广泛应用的瓶颈性问题。 本论文通过研究不同合成工艺、不同改性方法所合成的3种典型低甲醛释放UF树脂在不同固化反应体系条件下的固化反应机理和胶接性能,揭示了低甲醛释放UF树脂的固化特性。特别是针对通常情况下低F/U摩尔比UF树脂固化速度慢、胶接性能不理想的问题,可以通过合成工艺和改性剂以及不同固化体系得以解决。在典型配方基础上开发的低甲醛释放UF树脂胶粘剂已部分用于人造板生产。 本文利用现代仪器分析方法(¹³C NMR、TBA、DSC、DMA和¹³C CP/MAS NMR等)对3种低甲醛释放脲醛树脂胶粘剂的固化反应历程、固化产物的化学结构、甲醛释放规律、物理力学性能进行了较详细的研究。不同固化体系下三种低甲醛释放UF树脂固化产物的化学结构有所不同。不添加固化剂时,UF树脂固化产物中亚甲基醚含量低,羟甲基含量高,其固化交联反应程度低,甲醛释放量也高。添加固化剂后,UF树脂固化产物中羟甲基含量普遍降低,亚甲基醚含量提高,说明固化剂的加入促进了树脂的交联固化反应。不同固化体系对不同种类UF树脂的固化效果不同,固化后树脂的结构不同,其力学性能和甲醛释放能力也不同。研究结果全面揭示了UF树脂胶粘剂的固化反应历程和固化树脂的特性,对低甲醛释放UF树脂胶粘剂的推广应用具有重要的实际指导作用。 降低产品成本是企业和科研人员共同追求的目标之一。本研究在3种配方中通过改性开发出一种低成本低甲醛释放UF树脂胶粘剂,开辟了一条新的UF树脂改性途径,具有广阔的应用前景。 通过对低甲醛释放UF树脂固化反应历程和固化特性等的研究为确定低甲醛释放更多还原

【Abstract】 At present, the output of wood-based panels has more than 45 million m3 in China, urea-formaldehyde (UF) resins are basically used, most of it have high formaldehyde emission (FE) which cause FE over standard, producing environment and using environment of wood glued products are seriously polluted. Therefor, the compulsive standard " Indoor decorating & refurbishing materials limit of formaldehyde emission of wood-based panels and finishing products" is published by government in Jan, 2002,companies of wood-based panels are restricted to use UF resin with lew FE.Consequently, study on the curing mechanism of UF resin with low FE is basic theon problem related to the development of wood-based panels industry in China and also bottle-neck problem affect wide application of UF resin with low FE.Study on the curing mechanism and glue bond properties in different curing system of three typical UF resin with low FE of different synthesis technology and modification means,it revealed curing characteristics of UF resin with low FE. Especially on slow curing speed and unideal glue bond properties UF resin with low molar ratio, it can solved by synthesis technology, modifier and different curing system. UF resin with low FE developed base on typical recipe have partially used in wood-based panels .The thesis studied on the curing procedure, chemical structure, FE and mechanics properties of three UF resin with low FE by 13C NMR、 TBA、 DSC、 DMA and 13C CP/MAS NMR in details. The chemical structure of three kind of cured UF resin with low FE in different curing system is different. With no hardener, the content of methylene ether of cured UF resin is low, methylol is high, crosslinkage is low, FE is high also. With hardener, the content of methylol decrease, methylene ether increase, curing agent accelerate the crosslinking and curing reaction. The curing effect of different kind of UF resin in different curing system is different, chemical structure, FE and mechanics properties of cured UF resin is different. The results revealed the curing procedure and curing characteristics of UF resin with low FE, it has important practical function on the popularization and application of UF resin with low FE.It is one of the common goal to reduce production cost for enterprise and researcher. A UF resin with low FE and low cost has been developed in this research, open up a new modification means, it has wide application future.Study on the curing mechanism and curing characteristics of UF resin with low FE, it provide scientific basis to determine synthesis technology; evaluate glue bond properties andpredict glue bond durability. It ofler theoretic foundation to open up new modification means; determine synthesis technology; provide theoretic foundation to develop new curing system of UF resin with low FE, to meet different needs of various technology of wood-based panels. The research has significant theoretic value to promote the deep development and wide application of UF resin with low FE and important realistic meanings to ensure rapid development of wood-based panels industry in China.更多还原