淀粉改性脲醛树脂胶制备及胶合强度与耐水性能研究  

Preparation of Urea-formaldehyde Resin Adhesive Modified with Starch and Its Bonding Strength and Water Resistance

作　　者：孙楠[1] 吴雄志[1] 杨鹏元[1] 张超[1] 

机构地区：[1]桂林工学院材料与化学工程系,桂林541004

出　　处：《精细石油化工进展》2007年第7期34-35,共2页Advances in Fine Petrochemicals

摘　　要：利用分批加入尿素法,使尿素和甲醛先在pH7.5时进行羟甲基化反应,再在pH5.5时进行脱水缩合;然后加入第二批尿素和小麦淀粉在pH7.5条件下反应一定时间得到淀粉改性脲醛树脂胶。考察了小麦淀粉添加量对脲醛树脂胶应用于松木胶接时的胶合强度和耐水性能的影响。结果表明,淀粉添加量达到原料中尿素和甲醛总质量的10%时,脲醛树脂胶的胶合强度达4.784MPa最高值,淀粉用量占尿素和甲醛总量的20%时,脲醛树脂胶的胶合强度达4.308MPa,样品在25℃水中浸泡3天后的胶合强度达到2.742MPa,因此淀粉用量范围选择在20%以内合适。Urea - formaldehyde resin adhesive modified with starch was prepared by addition of urea twice, first methylolation reaction between urea and formaldehyde was carried out at pH of 7.5, condensation polymerization was carried out at pH of 5.5, then urea and wheat starch were added to the reaction system to react for certain time at pH of 7.5. The effects of starch content in adhesive on bonding s ment results showed that when the mass percentage of wheat trength and water resistance were examined. The experistarch reached 20 % based on the total mass of urea and formaldehyde, the average bonding strength of the samples reached 4.308 MPa, and after the sample dipped into 25℃ water for 3 days, the average the percentage of wheat starch not Key Words urea - formaldehyde bonding strength of the samples were kept at 2.742 MPa. The results showed that more than 20 % based on total mass of urea and formaldehyde was suitable. adhesive, bonding strength, water resistance, wheat starch

关 键 词：脲醛树脂胶 胶合强度 耐水性能 小麦淀粉 

分 类 号：TQ433.431[化学工程]