树枝状分子PAMAM可以用于脲醛树脂粘合剂的改性添加剂

树枝状分子PAMAM可以用于脲醛树脂粘合剂的改性添加剂
树枝状分子PAMAM可以用于脲醛树脂粘合剂的改性添加剂
树枝状分子PAMAM可以用于脲醛树脂粘合剂的改性添加剂，由于其特殊的结构，大量的端基基团，以及端基基团的性质决定了其可以很大程度上改善脲醛树脂粘合剂的性质。

端-NH2，-OH,-NH3Cl的PAMAM都能很好的改善脲醛粘合剂的性能，尤其是季胺化改性的PAMAM具有更加优异的性能，与常规氯化铵固化剂相比，其剪切强度提高了64%。

（1）PAMAM含有大量的表面基团，容易在气-液界面排列，可以降低脲醛树脂粘合剂的表面张力，减小接触角，即增加其在木质材料表面的润湿性，提供粘附性。

（2）并且PAMAM含有的大量活性基团，提高体系的反应活性。

并且在粘合剂与基材两者之间形成化学桥联，提高粘附性。

（3）降低体系的粘度，使其更均匀有效的与木材结合。

（4）树状分子可以捕捉脲醛粘合剂中的甲醛，更加环保。

威海晨源公司整理自《Poly(amidoamine) Dendritic Structures, Bearing Different End Groups, as Adhesion Promoters for Urea–Formaldehyde Wood Adhesive System》Hisham A. Essawy,
Heba A. Mohamed Department of Polymers and Pigments, National Research Center, Dokki 12311, Egypt Journal of Applied Polymer Science, Vol. 119, 760–767 (2011)
PAMAM can be used as modified additives for urea-formaldehyde resin adhesive.
PAMAM can be used as modified additives for urea-formaldehyde resin adhesive, due to its special structure, a large number of end groups, as well as the nature of the end groups can greatly improve its urea-formaldehyde resin adhesive agent properties. PAMAM-NH2,-OH,-NH3Cl can well improve the performance of urea-formaldehyde adhesive, in particular the quaternary amine-modified PAMAM has more
superior performance, compared with conventional curing agent of ammonium chloride, its shear strength increased by 64%. (1) PAMAM contains a large number of surface groups, easily array in the gas-liquid interface, urea-formaldehyde resin surface tension can be reduced , contact angle decreased, increasing the wettability of the wood material surface to provide adhesion. (2) PAMAM contains a large number of active groups to improve reactivity of the system. And form a chemical bridge between the adhesive and the base material to improve adhesion. (3) reducing the viscosity of the system to make it more uniform and efficient combination with wood. (4) dendrimer is more environmentally friendly as it can capture urea formaldehyde adhesives.
Weihai CY Dendrimer Technology Co.,Ltd forwards from“Poly(amidoamine) Dendritic Structures, Bearing Different End Groups, as Adhesion Promoters for Urea–Formaldehyde Wood Adhesive System”Hisham A. Essawy, Heba A. Mohamed Department of Polymers and Pigments, National Research Center, Dokki 12311, Egypt Journal of Applied Polymer Science, Vol. 119, 760–767 (2011)。