- 期刊
不同型態MUF膠製造本質板材
The Manufacture of Wood-Based Boards with Various MUF Adhesives
摘要
本研究乃探討不同三聚氰胺取代量之液狀及粉狀MUF膠應用於粒片板及纖維扳製造時，三聚氰胺取代量、膠合劑型態、製板條件等對其成板性質之影響。由其結果得知，添加三聚氰胺行共聚合反應所得被狀MUF膠應用於粒片板製造時，其成較之耐水靜曲強度及內聚強度可較UF膠提高，吸水厚度膨脹率及游離甲醛釋出量則可降低，在用膠量10%，熱壓溫度150℃，熱壓時間6min之製皈條件下，隨三聚氰胺取代量增加，其粒片板耐沸水靜曲強度增大，取代量30%以上時，其耐沸水之靜曲強度可達CNS標準中對200型拉片放濕潤強度90kgf/cm^2之要求以上。而粉狀MUF膠應用於粒片扳製造時，隨三聚氰胺取代量增加，其板材之耐沸水靜曲強度提高，然常態靜曲強度則下降，延長熱壓時間則可大幅提升其常態靜曲強度。液狀及粉狀MUF膠粒時板性質之比較，常態及耐沸水之靜曲強度以粉狀膠所製者較佳，內聚強度則以液狀膠所製者較高，吸水厚度膨脹率以液狀膠所製者較低，游離甲醛釋出量則兩者間無明顯差異。纖維板製造時，採液狀膠者其靜曲強度、內聚強度均較採用粉狀膠者高，吸水厚度膨脹率則較低。
並列摘要
The main purpose of this study was to investigate the effects of the amount of melamine Substitution, type of adhesives, and manufacturing condition on the properties of particleboards and fiberboards made with liquid and powder MUF adhesives with various amount of melamine Substitution. The results were summarized as follows: Particleboards made with liquid MUF adhesives had higher wet bending strength (MOR) and internal bond strength, lower thickness swelling and free formaldehyde emission than those made with liquid UF adhesives. Particleboards made with various liquid MUF at 10% of adhesive addition , and by hot-pressing temperature at 150℃ for 6 minutes, their wet bending strength increased with increasing the amount of melamine substitution in MUF resin and in the case of MUF re sin with the amount of melamine substitu t ion more than 30% used as particleboard adhesives, the bending strength of particleboards after boiling water test could exceed the requirement of CNS standard for 200 type particleboard. When particleboards made with powde red MUF ad hesives, increasing the amount of melamine substitation used in MUF could increase the wet bending strength too, but their dry bending strength would be reduced, but which could be improved by extending the hot -pressing time. Comparison between the properties of particleboards made with liquid and powdered MUF, the former had better internal bonding strength and dimensional stability, the latter had better dry and wet bending strength, and there were no significant difference for free formaldehyde emission. The properties, such as bending strength, internal bonding strength and dimensional stability of fiberboards made with liquid MUF adhesives appeared to be better than those made with powdered adhesives.