CAJ | 학술논문

以甲醛( F)、尿素( U)、三聚氰胺( M)为原料,采用弱碱-弱酸-弱碱工艺合成了三聚氰胺-尿素-甲醛( MUF)共聚树脂胶,配方中F与U物质的量之比为(1.2~1.5)∶1,F与(U+M)物质的量比为(1.1~1.2)∶1。在不同的反应阶段取样,采用IR和13C NMR对过程中所取样品进行了分析。结果表明,反应开始的碱性阶段主要生成二羟甲基三聚氰胺,在弱酸性阶段缩聚反应时分子间以醚键和亚甲基键联接为主。用反应最终产物压制的杨木胶合板,胶合强度1.07 MPa,甲醛释放量0.38 mg/L,浸渍剥离试验无剥离,达到E0级,胶合强度达到Ⅱ类板的要求(0.7 MPa)。
이갑철( F)、뇨소( U)、삼취청알( M)위원료,채용약감-약산-약감공예합성료삼취청알-뇨소-갑철( MUF)공취수지효,배방중F여U물질적량지비위(1.2~1.5)∶1,F여(U+M)물질적량비위(1.1~1.2)∶1。재불동적반응계단취양,채용IR화13C NMR대과정중소취양품진행료분석。결과표명,반응개시적감성계단주요생성이간갑기삼취청알,재약산성계단축취반응시분자간이미건화아갑기건련접위주。용반응최종산물압제적양목효합판,효합강도1.07 MPa,갑철석방량0.38 mg/L,침지박리시험무박리,체도E0급,효합강도체도Ⅱ류판적요구(0.7 MPa)。
Melamine-urea-formaldehyde resin was synthesized by using melamine, urea and formaldehyde as raw materials. The molar ratio of F and U was (1. 2-1. 5)∶1, and the molar ratio of F and (U+M) was (1. 1-1. 2)∶1 in MUF resin. Samples in different period of reaction were analyzed by FT-IR and 13C NMR. The results showed that the main products were dimethylol melamine at the beginning of the reaction and connected mainly by methyl ether linkage and methylene in the weak acid stage. The plywood manufactured with this MUF resin conformed E0 degree required by standard with the bonding strength of 1. 07 MPa and formaldehyde emission of 0. 38 mg/L. The bond strength of the plywood could satisfy the requirement of type Ⅱ plywood (0. 7 MPa).