胶合板用尿素改性酚醛树脂胶合性能的研究  

Adhesion Properties of Urea-modified Phenol Formaldehyde Resin for Plywood

作　　者：王荣兴[1] 张祖新 陈日清[1] 赵临五[1] 王春鹏[1] WANG Rongxing;ZHANG Zuxin;CHEN Riqing;ZHAO Linwu;WANG Chunpeng(Institute of Chemical Industry of Forest Products,CAF;National Engineering Lab.for Biomass Chemical Utilization;Key and Open Lab.of Forest Chemical Engineering,SFA;Key Lab.of Biomass Energy and Material,Jiangsu Province,Nanjing 210042,China)

机构地区：[1]中国林业科学研究院林产化学工业研究所 [2]生物质化学利用国家工程实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042

出　　处：《生物质化学工程》2018年第5期20-24,共5页Biomass Chemical Engineering

基　　金：“十二五”国家科技支撑计划资助(2015BAD14B03);木竹产业技术创新战略科研计划资助(TIAWBI201506)

摘　　要：制备了不同尿素用量的系列尿素改性酚醛(PUF)树脂体系(当尿素用量为苯酚质量的0、25%、43%、66%时分别记为PF、PUF-1、PUF-2、PUF-3),并将其用于制备胶合板,研究树脂在胶合板加工过程中的变化。结果表明:PUF-3树脂与桉木和杨木的接触角为79. 6°和81. 1°,小于PF树脂的,PUF对桉木相容性比杨木优良,PF树脂则相反;对4种树脂进行DSC分析显示,PF、PUF-1、PUF-2、PUF-3固化速率最大温度分别为146. 8、171. 4、171. 8和171. 8℃; PUF-3和面粉共混体系的流变行为显示该共混体系110℃开始发生固化反应,(130±5)℃为较合适的热压温度;对热压前后PF和PUF-3进行热重分析,结果发现PUF的耐高温性能优于PF,热压后形成的结构耐热性也更好; 4种树脂压制的胶合板性能达到E_0级,甲醛释放量均小于0. 5 mg/L,胶合强度分别为1. 42、1. 11、0. 98和0. 92 MPa。A series of urea-modified phenol formaldehyde(PUF)resin systems with different urea contents were prepared and used in the preparation of plywood(when the dosages of urea(U)were 0,25%,43%and 66%of the mass of phenol(P),the obtained samples were recorded as PF,PUF-1,PUF-2 and PUF-3).The resins were used for preparing plywood and the change of resins during plywood processing was studied.The results showed that the contact angles of the PUF-3 resin with eucalyptus and poplar were 79.6°and 81.1°,and the compatibility of PUF to eucalyptus wood was better than that of poplar wood.And the curing processes of four kinds of resins were obtained by DSC analysis.The temperatures of maximum curing rate of PF,PUF-1,PUF-2 and PUF-3 were 146.8,171.4,171.8 and 171.8℃.The rheological behavior of the complex system formed by mixing PUF-3 with flour was studied by means of rotating rheometer,and the curing reaction began to occur at 110℃,and the suitable hot-pressing temperature was(130±5)℃.The thermogravimetric analysis of PF and PUF-3 before and after hot pressing showed that the high temperature resistance of PUF was better than that of PF,and the heat resistance of structure formed by hot pressing was better.The properties of plywood produced with the four resins were qualified and reached E 0 level,the formaldehyde emission of eucalyptus plywood was less than 0.5 mg/L,and the bonding strengths of plywood were 1.42,1.11,0.98 and 0.92 MPa,respectively.

关 键 词：尿素改性酚醛树脂 木材胶黏剂 人造板 加工工艺 

分 类 号：TQ35[化学工程]