复合粉体改性MUF树脂胶黏剂的制备及其在中密度纤维板中的应用  

Preparation of Modified Melamine-Urea-Formaldehyde Resin with Blended Powder and Its Application in Medium Density Fiberboards

作　　者：林金秀 陈文渊 凌尚现 陶靖 胡振光 LIN Jinxiu;CHEN Wenyuan;LING Shangxian;TAO Jing;HU Zhenguang(School of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541000,Guangxi,China;Guangxi Forest Industry Group Co.,Ltd.,Nanning 530004,Guangxi,China;Guangxi Fangchenggang Hengtai Technology Development Co.,Ltd.,Fangchenggang 538000,Guangxi,China)

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541000 [2]广西森工集团股份有限公司,广西南宁530004 [3]广西防城港市恒泰科技开发有限公司,广西防城港538000

出　　处：《木材科学与技术》2024年第6期23-31,共9页Chinese Journal of Wood Science and Technology

基　　金：广西重点研发项目“基于伊蒙黏土改性的高性能环保胶黏剂制备关键技术研究与示范”(AB24010212)。

摘　　要：以不同质量比(3∶7、5∶5、7∶3)和添加量(5%、10%、15%)的云母粉与硅藻土(复合粉体)通过物理共混,改性尿素-三聚氰胺-甲醛树脂(melamine-urea-formaldehyde,MUF)胶黏剂,采用多种表征手段探讨改性前后MUF树脂和中密度纤维板(medium density fiberboard,MDF)的性能,以及复合粉体质量比和添加量对MDF性能的影响。结果显示,在MUF树脂中添加复合粉体后,树脂黏度和固体含量增加,固化时间延长,游离甲醛含量降低;改性胶黏剂制备MDF的官能团发生微小变化,热稳定性提高。当复合粉体的质量比为7∶3且以5%的添加量添加时,MDF的静曲强度、弹性模量和内结合强度分别为27.11、2 523和0.81 MPa,比对照板分别提升9%、7%、53%,24 h吸水厚度膨胀率为8.5%,物理力学性能均达到GB/T 11718—2021《中密度纤维板》干燥状态使用的普通型MDF的性能要求;甲醛释放量由3.50 mg/100 g降至2.85 mg/100 g,降低了19%,达到T/CNFPIA 1001—2019《人造板甲醛释放限量》E0级要求。In this study mica powder and diatomaceous earth(composite powder)were physically blended to modify urea melamine formaldehyde(MUF)resin at different mass ratios(3∶7,5∶5,7∶3)and quantities(5%,10%,15%).Multiple characterization methods were used to investigate the properties of MUF resin before and after modification and medium density fiberboards(MDF)made with this resin.The effects of mass ratio and quantity of the blended powder on the properties of fiberboards was discussed.The results showed that adding blended powder to MUF resin increased its viscosity and solid content,extended curing time,and reduced free formaldehyde content.Minor changes in functional groups of fiberboards prepared with the modified adhesive were found.The thermal stability was improved.When the mass ratio of mica powder to diatomaceous earth was 7∶3 with the quantity of 5%,the modulus of rupture,the modulus of elasticity,and the internal bonding strength of the MDF were 27.11,2523,and 0.81 MPa,respectively,which were 9%,7%,and 53%higher than without modification.The 24-hour water absorption thickness expansion rate was 8.5%.The physical and mechanical properties met the performance requirements of the ordinary MDF used in a dry state according to the GB/T 11718—2021“Medium Density Fiberboard”.The formaldehyde emission decreased from 3.50 mg/100 g to 2.85 mg/100 g,which was a decrease of 19%,meeting the E0 level requirement of T/CNFPIA 1001—2019“Formaldehyde Emission Limits for Artificial Boards”.

关 键 词：复合粉体 硅藻土 云母粉 MUF树脂 中密度纤维板 

分 类 号：TS653[轻工技术与工程]