Effects of addition ammonia modified urea-melamine -formaldehyde resin on the adhesions and formaldehyde emission in plywood
This study was carried out to investigated the effect of addition ammonia which concentration is 20 percent modified urea-melamine-formaldehyde resin on the formald-ehyde emission and internal bonding strength,when hotpress temperature,time and pressure for every plywood was coincide.To determine and compare the effect of ammonia content 0,2.5,5 percent by weight of formaldehyde were used.To determine the level of formaldehyde emission,we used the desiccator method.The formaldehyde emissions from poplar multi-plywoods were significantly decreased with increased additions of ammonia,at a ammonia ratio of only 2.5％,the formaldehyde emission level of the un-coated samples which is seven-ply plywood can meet the F☆☆☆ grade,and also the samples with 2.5％ ammonia modified resin hot-pressed showed good bonding strength.
Urea-formaldehyde resin Ammonia Bonding strength Formaldehyde emission.
Junyou Shi shengyou Ye
Beihua university,Jilin city jilin province,China
国际会议
哈尔滨
英文
1226-1229
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）